Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for STM32 Digital Camera Memory Interface
 *
 * Copyright (C) STMicroelectronics SA 2017
 * Authors: Yannick Fertre <yannick.fertre@st.com>
 *          Hugues Fruchet <hugues.fruchet@st.com>
 *          for STMicroelectronics.
 *
 * This driver is based on atmel_isi.c
 *
 */
 
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/videodev2.h>
 
#include <media/v4l2-ctrls.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-image-sizes.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-rect.h>
#include <media/videobuf2-dma-contig.h>
 
#define DRV_NAME "stm32-dcmi"
 
/* Registers offset for DCMI */
#define DCMI_CR		0x00 /* Control Register */
#define DCMI_SR		0x04 /* Status Register */
#define DCMI_RIS	0x08 /* Raw Interrupt Status register */
#define DCMI_IER	0x0C /* Interrupt Enable Register */
#define DCMI_MIS	0x10 /* Masked Interrupt Status register */
#define DCMI_ICR	0x14 /* Interrupt Clear Register */
#define DCMI_ESCR	0x18 /* Embedded Synchronization Code Register */
#define DCMI_ESUR	0x1C /* Embedded Synchronization Unmask Register */
#define DCMI_CWSTRT	0x20 /* Crop Window STaRT */
#define DCMI_CWSIZE	0x24 /* Crop Window SIZE */
#define DCMI_DR		0x28 /* Data Register */
#define DCMI_IDR	0x2C /* IDentifier Register */
 
/* Bits definition for control register (DCMI_CR) */
#define CR_CAPTURE	BIT(0)
#define CR_CM		BIT(1)
#define CR_CROP		BIT(2)
#define CR_JPEG		BIT(3)
#define CR_ESS		BIT(4)
#define CR_PCKPOL	BIT(5)
#define CR_HSPOL	BIT(6)
#define CR_VSPOL	BIT(7)
#define CR_FCRC_0	BIT(8)
#define CR_FCRC_1	BIT(9)
#define CR_EDM_0	BIT(10)
#define CR_EDM_1	BIT(11)
#define CR_ENABLE	BIT(14)
 
/* Bits definition for status register (DCMI_SR) */
#define SR_HSYNC	BIT(0)
#define SR_VSYNC	BIT(1)
#define SR_FNE		BIT(2)
 
/*
 * Bits definition for interrupt registers
 * (DCMI_RIS, DCMI_IER, DCMI_MIS, DCMI_ICR)
 */
#define IT_FRAME	BIT(0)
#define IT_OVR		BIT(1)
#define IT_ERR		BIT(2)
#define IT_VSYNC	BIT(3)
#define IT_LINE		BIT(4)
 
enum state {
<------>STOPPED = 0,
<------>WAIT_FOR_BUFFER,
<------>RUNNING,
};
 
#define MIN_WIDTH	16U
#define MAX_WIDTH	2592U
#define MIN_HEIGHT	16U
#define MAX_HEIGHT	2592U
 
#define TIMEOUT_MS	1000
 
#define OVERRUN_ERROR_THRESHOLD	3
 
struct dcmi_graph_entity {
<------>struct v4l2_async_subdev asd;
 
<------>struct device_node *remote_node;
<------>struct v4l2_subdev *source;
};
 
struct dcmi_format {
<------>u32	fourcc;
<------>u32	mbus_code;
<------>u8	bpp;
};
 
struct dcmi_framesize {
<------>u32	width;
<------>u32	height;
};
 
struct dcmi_buf {
<------>struct vb2_v4l2_buffer	vb;
<------>bool			prepared;
<------>dma_addr_t		paddr;
<------>size_t			size;
<------>struct list_head	list;
};
 
struct stm32_dcmi {
<------>/* Protects the access of variables shared within the interrupt */
<------>spinlock_t			irqlock;
<------>struct device			*dev;
<------>void __iomem			*regs;
<------>struct resource			*res;
<------>struct reset_control		*rstc;
<------>int				sequence;
<------>struct list_head		buffers;
<------>struct dcmi_buf			*active;
<------>int			irq;
 
<------>struct v4l2_device		v4l2_dev;
<------>struct video_device		*vdev;
<------>struct v4l2_async_notifier	notifier;
<------>struct dcmi_graph_entity	entity;
<------>struct v4l2_format		fmt;
<------>struct v4l2_rect		crop;
<------>bool				do_crop;
 
<------>const struct dcmi_format	**sd_formats;
<------>unsigned int			num_of_sd_formats;
<------>const struct dcmi_format	*sd_format;
<------>struct dcmi_framesize		*sd_framesizes;
<------>unsigned int			num_of_sd_framesizes;
<------>struct dcmi_framesize		sd_framesize;
<------>struct v4l2_rect		sd_bounds;
 
<------>/* Protect this data structure */
<------>struct mutex			lock;
<------>struct vb2_queue		queue;
 
<------>struct v4l2_fwnode_bus_parallel	bus;
<------>struct completion		complete;
<------>struct clk			*mclk;
<------>enum state			state;
<------>struct dma_chan			*dma_chan;
<------>dma_cookie_t			dma_cookie;
<------>u32				misr;
<------>int				errors_count;
<------>int				overrun_count;
<------>int				buffers_count;
 
<------>/* Ensure DMA operations atomicity */
<------>struct mutex			dma_lock;
 
<------>struct media_device		mdev;
<------>struct media_pad		vid_cap_pad;
<------>struct media_pipeline		pipeline;
};
 
static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
{
<------>return container_of(n, struct stm32_dcmi, notifier);
}
 
static inline u32 reg_read(void __iomem *base, u32 reg)
{
<------>return readl_relaxed(base + reg);
}
 
static inline void reg_write(void __iomem *base, u32 reg, u32 val)
{
<------>writel_relaxed(val, base + reg);
}
 
static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
{
<------>reg_write(base, reg, reg_read(base, reg) | mask);
}
 
static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
{
<------>reg_write(base, reg, reg_read(base, reg) & ~mask);
}
 
static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf);
 
static void dcmi_buffer_done(struct stm32_dcmi *dcmi,
<------><------><------>     struct dcmi_buf *buf,
<------><------><------>     size_t bytesused,
<------><------><------>     int err)
{
<------>struct vb2_v4l2_buffer *vbuf;
 
<------>if (!buf)
<------><------>return;
 
<------>list_del_init(&buf->list);
 
<------>vbuf = &buf->vb;
 
<------>vbuf->sequence = dcmi->sequence++;
<------>vbuf->field = V4L2_FIELD_NONE;
<------>vbuf->vb2_buf.timestamp = ktime_get_ns();
<------>vb2_set_plane_payload(&vbuf->vb2_buf, 0, bytesused);
<------>vb2_buffer_done(&vbuf->vb2_buf,
<------><------><------>err ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
<------>dev_dbg(dcmi->dev, "buffer[%d] done seq=%d, bytesused=%zu\n",
<------><------>vbuf->vb2_buf.index, vbuf->sequence, bytesused);
 
<------>dcmi->buffers_count++;
<------>dcmi->active = NULL;
}
 
static int dcmi_restart_capture(struct stm32_dcmi *dcmi)
{
<------>struct dcmi_buf *buf;
 
<------>spin_lock_irq(&dcmi->irqlock);
 
<------>if (dcmi->state != RUNNING) {
<------><------>spin_unlock_irq(&dcmi->irqlock);
<------><------>return -EINVAL;
<------>}
 
<------>/* Restart a new DMA transfer with next buffer */
<------>if (list_empty(&dcmi->buffers)) {
<------><------>dev_dbg(dcmi->dev, "Capture restart is deferred to next buffer queueing\n");
<------><------>dcmi->state = WAIT_FOR_BUFFER;
<------><------>spin_unlock_irq(&dcmi->irqlock);
<------><------>return 0;
<------>}
<------>buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
<------>dcmi->active = buf;
 
<------>spin_unlock_irq(&dcmi->irqlock);
 
<------>return dcmi_start_capture(dcmi, buf);
}
 
static void dcmi_dma_callback(void *param)
{
<------>struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
<------>struct dma_tx_state state;
<------>enum dma_status status;
<------>struct dcmi_buf *buf = dcmi->active;
 
<------>spin_lock_irq(&dcmi->irqlock);
 
<------>/* Check DMA status */
<------>status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
 
<------>switch (status) {
<------>case DMA_IN_PROGRESS:
<------><------>dev_dbg(dcmi->dev, "%s: Received DMA_IN_PROGRESS\n", __func__);
<------><------>break;
<------>case DMA_PAUSED:
<------><------>dev_err(dcmi->dev, "%s: Received DMA_PAUSED\n", __func__);
<------><------>break;
<------>case DMA_ERROR:
<------><------>dev_err(dcmi->dev, "%s: Received DMA_ERROR\n", __func__);
 
<------><------>/* Return buffer to V4L2 in error state */
<------><------>dcmi_buffer_done(dcmi, buf, 0, -EIO);
<------><------>break;
<------>case DMA_COMPLETE:
<------><------>dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
 
<------><------>/* Return buffer to V4L2 */
<------><------>dcmi_buffer_done(dcmi, buf, buf->size, 0);
 
<------><------>spin_unlock_irq(&dcmi->irqlock);
 
<------><------>/* Restart capture */
<------><------>if (dcmi_restart_capture(dcmi))
<------><------><------>dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete\n",
<------><------><------><------>__func__);
<------><------>return;
<------>default:
<------><------>dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
<------><------>break;
<------>}
 
<------>spin_unlock_irq(&dcmi->irqlock);
}
 
static int dcmi_start_dma(struct stm32_dcmi *dcmi,
<------><------><------>  struct dcmi_buf *buf)
{
<------>struct dma_async_tx_descriptor *desc = NULL;
<------>struct dma_slave_config config;
<------>int ret;
 
<------>memset(&config, 0, sizeof(config));
 
<------>config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
<------>config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
<------>config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
<------>config.dst_maxburst = 4;
 
<------>/* Configure DMA channel */
<------>ret = dmaengine_slave_config(dcmi->dma_chan, &config);
<------>if (ret < 0) {
<------><------>dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
<------><------><------>__func__, ret);
<------><------>return ret;
<------>}
 
<------>/*
<------> * Avoid call of dmaengine_terminate_all() between
<------> * dmaengine_prep_slave_single() and dmaengine_submit()
<------> * by locking the whole DMA submission sequence
<------> */
<------>mutex_lock(&dcmi->dma_lock);
 
<------>/* Prepare a DMA transaction */
<------>desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
<------><------><------><------><------>   buf->size,
<------><------><------><------><------>   DMA_DEV_TO_MEM,
<------><------><------><------><------>   DMA_PREP_INTERRUPT);
<------>if (!desc) {
<------><------>dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer phy=%pad size=%zu\n",
<------><------><------>__func__, &buf->paddr, buf->size);
<------><------>mutex_unlock(&dcmi->dma_lock);
<------><------>return -EINVAL;
<------>}
 
<------>/* Set completion callback routine for notification */
<------>desc->callback = dcmi_dma_callback;
<------>desc->callback_param = dcmi;
 
<------>/* Push current DMA transaction in the pending queue */
<------>dcmi->dma_cookie = dmaengine_submit(desc);
<------>if (dma_submit_error(dcmi->dma_cookie)) {
<------><------>dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
<------><------>mutex_unlock(&dcmi->dma_lock);
<------><------>return -ENXIO;
<------>}
 
<------>mutex_unlock(&dcmi->dma_lock);
 
<------>dma_async_issue_pending(dcmi->dma_chan);
 
<------>return 0;
}
 
static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf)
{
<------>int ret;
 
<------>if (!buf)
<------><------>return -EINVAL;
 
<------>ret = dcmi_start_dma(dcmi, buf);
<------>if (ret) {
<------><------>dcmi->errors_count++;
<------><------>return ret;
<------>}
 
<------>/* Enable capture */
<------>reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
 
<------>return 0;
}
 
static void dcmi_set_crop(struct stm32_dcmi *dcmi)
{
<------>u32 size, start;
 
<------>/* Crop resolution */
<------>size = ((dcmi->crop.height - 1) << 16) |
<------><------>((dcmi->crop.width << 1) - 1);
<------>reg_write(dcmi->regs, DCMI_CWSIZE, size);
 
<------>/* Crop start point */
<------>start = ((dcmi->crop.top) << 16) |
<------><------> ((dcmi->crop.left << 1));
<------>reg_write(dcmi->regs, DCMI_CWSTRT, start);
 
<------>dev_dbg(dcmi->dev, "Cropping to %ux%u@%u:%u\n",
<------><------>dcmi->crop.width, dcmi->crop.height,
<------><------>dcmi->crop.left, dcmi->crop.top);
 
<------>/* Enable crop */
<------>reg_set(dcmi->regs, DCMI_CR, CR_CROP);
}
 
static void dcmi_process_jpeg(struct stm32_dcmi *dcmi)
{
<------>struct dma_tx_state state;
<------>enum dma_status status;
<------>struct dcmi_buf *buf = dcmi->active;
 
<------>if (!buf)
<------><------>return;
 
<------>/*
<------> * Because of variable JPEG buffer size sent by sensor,
<------> * DMA transfer never completes due to transfer size never reached.
<------> * In order to ensure that all the JPEG data are transferred
<------> * in active buffer memory, DMA is drained.
<------> * Then DMA tx status gives the amount of data transferred
<------> * to memory, which is then returned to V4L2 through the active
<------> * buffer payload.
<------> */
 
<------>/* Drain DMA */
<------>dmaengine_synchronize(dcmi->dma_chan);
 
<------>/* Get DMA residue to get JPEG size */
<------>status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
<------>if (status != DMA_ERROR && state.residue < buf->size) {
<------><------>/* Return JPEG buffer to V4L2 with received JPEG buffer size */
<------><------>dcmi_buffer_done(dcmi, buf, buf->size - state.residue, 0);
<------>} else {
<------><------>dcmi->errors_count++;
<------><------>dev_err(dcmi->dev, "%s: Cannot get JPEG size from DMA\n",
<------><------><------>__func__);
<------><------>/* Return JPEG buffer to V4L2 in ERROR state */
<------><------>dcmi_buffer_done(dcmi, buf, 0, -EIO);
<------>}
 
<------>/* Abort DMA operation */
<------>dmaengine_terminate_all(dcmi->dma_chan);
 
<------>/* Restart capture */
<------>if (dcmi_restart_capture(dcmi))
<------><------>dev_err(dcmi->dev, "%s: Cannot restart capture on JPEG received\n",
<------><------><------>__func__);
}
 
static irqreturn_t dcmi_irq_thread(int irq, void *arg)
{
<------>struct stm32_dcmi *dcmi = arg;
 
<------>spin_lock_irq(&dcmi->irqlock);
 
<------>if (dcmi->misr & IT_OVR) {
<------><------>dcmi->overrun_count++;
<------><------>if (dcmi->overrun_count > OVERRUN_ERROR_THRESHOLD)
<------><------><------>dcmi->errors_count++;
<------>}
<------>if (dcmi->misr & IT_ERR)
<------><------>dcmi->errors_count++;
 
<------>if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG &&
<------>    dcmi->misr & IT_FRAME) {
<------><------>/* JPEG received */
<------><------>spin_unlock_irq(&dcmi->irqlock);
<------><------>dcmi_process_jpeg(dcmi);
<------><------>return IRQ_HANDLED;
<------>}
 
<------>spin_unlock_irq(&dcmi->irqlock);
<------>return IRQ_HANDLED;
}
 
static irqreturn_t dcmi_irq_callback(int irq, void *arg)
{
<------>struct stm32_dcmi *dcmi = arg;
<------>unsigned long flags;
 
<------>spin_lock_irqsave(&dcmi->irqlock, flags);
 
<------>dcmi->misr = reg_read(dcmi->regs, DCMI_MIS);
 
<------>/* Clear interrupt */
<------>reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
 
<------>spin_unlock_irqrestore(&dcmi->irqlock, flags);
 
<------>return IRQ_WAKE_THREAD;
}
 
static int dcmi_queue_setup(struct vb2_queue *vq,
<------><------><------>    unsigned int *nbuffers,
<------><------><------>    unsigned int *nplanes,
<------><------><------>    unsigned int sizes[],
<------><------><------>    struct device *alloc_devs[])
{
<------>struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
<------>unsigned int size;
 
<------>size = dcmi->fmt.fmt.pix.sizeimage;
 
<------>/* Make sure the image size is large enough */
<------>if (*nplanes)
<------><------>return sizes[0] < size ? -EINVAL : 0;
 
<------>*nplanes = 1;
<------>sizes[0] = size;
 
<------>dev_dbg(dcmi->dev, "Setup queue, count=%d, size=%d\n",
<------><------>*nbuffers, size);
 
<------>return 0;
}
 
static int dcmi_buf_init(struct vb2_buffer *vb)
{
<------>struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
<------>struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 
<------>INIT_LIST_HEAD(&buf->list);
 
<------>return 0;
}
 
static int dcmi_buf_prepare(struct vb2_buffer *vb)
{
<------>struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
<------>struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
<------>struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
<------>unsigned long size;
 
<------>size = dcmi->fmt.fmt.pix.sizeimage;
 
<------>if (vb2_plane_size(vb, 0) < size) {
<------><------>dev_err(dcmi->dev, "%s data will not fit into plane (%lu < %lu)\n",
<------><------><------>__func__, vb2_plane_size(vb, 0), size);
<------><------>return -EINVAL;
<------>}
 
<------>vb2_set_plane_payload(vb, 0, size);
 
<------>if (!buf->prepared) {
<------><------>/* Get memory addresses */
<------><------>buf->paddr =
<------><------><------>vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
<------><------>buf->size = vb2_plane_size(&buf->vb.vb2_buf, 0);
<------><------>buf->prepared = true;
 
<------><------>vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->size);
 
<------><------>dev_dbg(dcmi->dev, "buffer[%d] phy=%pad size=%zu\n",
<------><------><------>vb->index, &buf->paddr, buf->size);
<------>}
 
<------>return 0;
}
 
static void dcmi_buf_queue(struct vb2_buffer *vb)
{
<------>struct stm32_dcmi *dcmi =  vb2_get_drv_priv(vb->vb2_queue);
<------>struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
<------>struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
 
<------>spin_lock_irq(&dcmi->irqlock);
 
<------>/* Enqueue to video buffers list */
<------>list_add_tail(&buf->list, &dcmi->buffers);
 
<------>if (dcmi->state == WAIT_FOR_BUFFER) {
<------><------>dcmi->state = RUNNING;
<------><------>dcmi->active = buf;
 
<------><------>dev_dbg(dcmi->dev, "Starting capture on buffer[%d] queued\n",
<------><------><------>buf->vb.vb2_buf.index);
 
<------><------>spin_unlock_irq(&dcmi->irqlock);
<------><------>if (dcmi_start_capture(dcmi, buf))
<------><------><------>dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
<------><------><------><------>__func__);
<------><------>return;
<------>}
 
<------>spin_unlock_irq(&dcmi->irqlock);
}
 
static struct media_entity *dcmi_find_source(struct stm32_dcmi *dcmi)
{
<------>struct media_entity *entity = &dcmi->vdev->entity;
<------>struct media_pad *pad;
 
<------>/* Walk searching for entity having no sink */
<------>while (1) {
<------><------>pad = &entity->pads[0];
<------><------>if (!(pad->flags & MEDIA_PAD_FL_SINK))
<------><------><------>break;
 
<------><------>pad = media_entity_remote_pad(pad);
<------><------>if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
<------><------><------>break;
 
<------><------>entity = pad->entity;
<------>}
 
<------>return entity;
}
 
static int dcmi_pipeline_s_fmt(struct stm32_dcmi *dcmi,
<------><------><------>       struct v4l2_subdev_pad_config *pad_cfg,
<------><------><------>       struct v4l2_subdev_format *format)
{
<------>struct media_entity *entity = &dcmi->entity.source->entity;
<------>struct v4l2_subdev *subdev;
<------>struct media_pad *sink_pad = NULL;
<------>struct media_pad *src_pad = NULL;
<------>struct media_pad *pad = NULL;
<------>struct v4l2_subdev_format fmt = *format;
<------>bool found = false;
<------>int ret;
 
<------>/*
<------> * Starting from sensor subdevice, walk within
<------> * pipeline and set format on each subdevice
<------> */
<------>while (1) {
<------><------>unsigned int i;
 
<------><------>/* Search if current entity has a source pad */
<------><------>for (i = 0; i < entity->num_pads; i++) {
<------><------><------>pad = &entity->pads[i];
<------><------><------>if (pad->flags & MEDIA_PAD_FL_SOURCE) {
<------><------><------><------>src_pad = pad;
<------><------><------><------>found = true;
<------><------><------><------>break;
<------><------><------>}
<------><------>}
<------><------>if (!found)
<------><------><------>break;
 
<------><------>subdev = media_entity_to_v4l2_subdev(entity);
 
<------><------>/* Propagate format on sink pad if any, otherwise source pad */
<------><------>if (sink_pad)
<------><------><------>pad = sink_pad;
 
<------><------>dev_dbg(dcmi->dev, "\"%s\":%d pad format set to 0x%x %ux%u\n",
<------><------><------>subdev->name, pad->index, format->format.code,
<------><------><------>format->format.width, format->format.height);
 
<------><------>fmt.pad = pad->index;
<------><------>ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
<------><------>if (ret < 0) {
<------><------><------>dev_err(dcmi->dev, "%s: Failed to set format 0x%x %ux%u on \"%s\":%d pad (%d)\n",
<------><------><------><------>__func__, format->format.code,
<------><------><------><------>format->format.width, format->format.height,
<------><------><------><------>subdev->name, pad->index, ret);
<------><------><------>return ret;
<------><------>}
 
<------><------>if (fmt.format.code != format->format.code ||
<------><------>    fmt.format.width != format->format.width ||
<------><------>    fmt.format.height != format->format.height) {
<------><------><------>dev_dbg(dcmi->dev, "\"%s\":%d pad format has been changed to 0x%x %ux%u\n",
<------><------><------><------>subdev->name, pad->index, fmt.format.code,
<------><------><------><------>fmt.format.width, fmt.format.height);
<------><------>}
 
<------><------>/* Walk to next entity */
<------><------>sink_pad = media_entity_remote_pad(src_pad);
<------><------>if (!sink_pad || !is_media_entity_v4l2_subdev(sink_pad->entity))
<------><------><------>break;
 
<------><------>entity = sink_pad->entity;
<------>}
<------>*format = fmt;
 
<------>return 0;
}
 
static int dcmi_pipeline_s_stream(struct stm32_dcmi *dcmi, int state)
{
<------>struct media_entity *entity = &dcmi->vdev->entity;
<------>struct v4l2_subdev *subdev;
<------>struct media_pad *pad;
<------>int ret;
 
<------>/* Start/stop all entities within pipeline */
<------>while (1) {
<------><------>pad = &entity->pads[0];
<------><------>if (!(pad->flags & MEDIA_PAD_FL_SINK))
<------><------><------>break;
 
<------><------>pad = media_entity_remote_pad(pad);
<------><------>if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
<------><------><------>break;
 
<------><------>entity = pad->entity;
<------><------>subdev = media_entity_to_v4l2_subdev(entity);
 
<------><------>ret = v4l2_subdev_call(subdev, video, s_stream, state);
<------><------>if (ret < 0 && ret != -ENOIOCTLCMD) {
<------><------><------>dev_err(dcmi->dev, "%s: \"%s\" failed to %s streaming (%d)\n",
<------><------><------><------>__func__, subdev->name,
<------><------><------><------>state ? "start" : "stop", ret);
<------><------><------>return ret;
<------><------>}
 
<------><------>dev_dbg(dcmi->dev, "\"%s\" is %s\n",
<------><------><------>subdev->name, state ? "started" : "stopped");
<------>}
 
<------>return 0;
}
 
static int dcmi_pipeline_start(struct stm32_dcmi *dcmi)
{
<------>return dcmi_pipeline_s_stream(dcmi, 1);
}
 
static void dcmi_pipeline_stop(struct stm32_dcmi *dcmi)
{
<------>dcmi_pipeline_s_stream(dcmi, 0);
}
 
static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
{
<------>struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
<------>struct dcmi_buf *buf, *node;
<------>u32 val = 0;
<------>int ret;
 
<------>ret = pm_runtime_get_sync(dcmi->dev);
<------>if (ret < 0) {
<------><------>dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync (%d)\n",
<------><------><------>__func__, ret);
<------><------>goto err_pm_put;
<------>}
 
<------>ret = media_pipeline_start(&dcmi->vdev->entity, &dcmi->pipeline);
<------>if (ret < 0) {
<------><------>dev_err(dcmi->dev, "%s: Failed to start streaming, media pipeline start error (%d)\n",
<------><------><------>__func__, ret);
<------><------>goto err_pm_put;
<------>}
 
<------>ret = dcmi_pipeline_start(dcmi);
<------>if (ret)
<------><------>goto err_media_pipeline_stop;
 
<------>spin_lock_irq(&dcmi->irqlock);
 
<------>/* Set bus width */
<------>switch (dcmi->bus.bus_width) {
<------>case 14:
<------><------>val |= CR_EDM_0 | CR_EDM_1;
<------><------>break;
<------>case 12:
<------><------>val |= CR_EDM_1;
<------><------>break;
<------>case 10:
<------><------>val |= CR_EDM_0;
<------><------>break;
<------>default:
<------><------>/* Set bus width to 8 bits by default */
<------><------>break;
<------>}
 
<------>/* Set vertical synchronization polarity */
<------>if (dcmi->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
<------><------>val |= CR_VSPOL;
 
<------>/* Set horizontal synchronization polarity */
<------>if (dcmi->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
<------><------>val |= CR_HSPOL;
 
<------>/* Set pixel clock polarity */
<------>if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
<------><------>val |= CR_PCKPOL;
 
<------>reg_write(dcmi->regs, DCMI_CR, val);
 
<------>/* Set crop */
<------>if (dcmi->do_crop)
<------><------>dcmi_set_crop(dcmi);
 
<------>/* Enable jpeg capture */
<------>if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
<------><------>reg_set(dcmi->regs, DCMI_CR, CR_CM);/* Snapshot mode */
 
<------>/* Enable dcmi */
<------>reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
 
<------>dcmi->sequence = 0;
<------>dcmi->errors_count = 0;
<------>dcmi->overrun_count = 0;
<------>dcmi->buffers_count = 0;
 
<------>/*
<------> * Start transfer if at least one buffer has been queued,
<------> * otherwise transfer is deferred at buffer queueing
<------> */
<------>if (list_empty(&dcmi->buffers)) {
<------><------>dev_dbg(dcmi->dev, "Start streaming is deferred to next buffer queueing\n");
<------><------>dcmi->state = WAIT_FOR_BUFFER;
<------><------>spin_unlock_irq(&dcmi->irqlock);
<------><------>return 0;
<------>}
 
<------>buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
<------>dcmi->active = buf;
 
<------>dcmi->state = RUNNING;
 
<------>dev_dbg(dcmi->dev, "Start streaming, starting capture\n");
 
<------>spin_unlock_irq(&dcmi->irqlock);
<------>ret = dcmi_start_capture(dcmi, buf);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "%s: Start streaming failed, cannot start capture\n",
<------><------><------>__func__);
<------><------>goto err_pipeline_stop;
<------>}
 
<------>/* Enable interruptions */
<------>if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
<------><------>reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
<------>else
<------><------>reg_set(dcmi->regs, DCMI_IER, IT_OVR | IT_ERR);
 
<------>return 0;
 
err_pipeline_stop:
<------>dcmi_pipeline_stop(dcmi);
 
err_media_pipeline_stop:
<------>media_pipeline_stop(&dcmi->vdev->entity);
 
err_pm_put:
<------>pm_runtime_put(dcmi->dev);
<------>spin_lock_irq(&dcmi->irqlock);
<------>/*
<------> * Return all buffers to vb2 in QUEUED state.
<------> * This will give ownership back to userspace
<------> */
<------>list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
<------><------>list_del_init(&buf->list);
<------><------>vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
<------>}
<------>dcmi->active = NULL;
<------>spin_unlock_irq(&dcmi->irqlock);
 
<------>return ret;
}
 
static void dcmi_stop_streaming(struct vb2_queue *vq)
{
<------>struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
<------>struct dcmi_buf *buf, *node;
 
<------>dcmi_pipeline_stop(dcmi);
 
<------>media_pipeline_stop(&dcmi->vdev->entity);
 
<------>spin_lock_irq(&dcmi->irqlock);
 
<------>/* Disable interruptions */
<------>reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
 
<------>/* Disable DCMI */
<------>reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
 
<------>/* Return all queued buffers to vb2 in ERROR state */
<------>list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
<------><------>list_del_init(&buf->list);
<------><------>vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
<------>}
 
<------>dcmi->active = NULL;
<------>dcmi->state = STOPPED;
 
<------>spin_unlock_irq(&dcmi->irqlock);
 
<------>/* Stop all pending DMA operations */
<------>mutex_lock(&dcmi->dma_lock);
<------>dmaengine_terminate_all(dcmi->dma_chan);
<------>mutex_unlock(&dcmi->dma_lock);
 
<------>pm_runtime_put(dcmi->dev);
 
<------>if (dcmi->errors_count)
<------><------>dev_warn(dcmi->dev, "Some errors found while streaming: errors=%d (overrun=%d), buffers=%d\n",
<------><------><------> dcmi->errors_count, dcmi->overrun_count,
<------><------><------> dcmi->buffers_count);
<------>dev_dbg(dcmi->dev, "Stop streaming, errors=%d (overrun=%d), buffers=%d\n",
<------><------>dcmi->errors_count, dcmi->overrun_count,
<------><------>dcmi->buffers_count);
}
 
static const struct vb2_ops dcmi_video_qops = {
<------>.queue_setup		= dcmi_queue_setup,
<------>.buf_init		= dcmi_buf_init,
<------>.buf_prepare		= dcmi_buf_prepare,
<------>.buf_queue		= dcmi_buf_queue,
<------>.start_streaming	= dcmi_start_streaming,
<------>.stop_streaming		= dcmi_stop_streaming,
<------>.wait_prepare		= vb2_ops_wait_prepare,
<------>.wait_finish		= vb2_ops_wait_finish,
};
 
static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
<------><------><------>      struct v4l2_format *fmt)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
 
<------>*fmt = dcmi->fmt;
 
<------>return 0;
}
 
static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
<------><------><------><------><------><------>       unsigned int fourcc)
{
<------>unsigned int num_formats = dcmi->num_of_sd_formats;
<------>const struct dcmi_format *fmt;
<------>unsigned int i;
 
<------>for (i = 0; i < num_formats; i++) {
<------><------>fmt = dcmi->sd_formats[i];
<------><------>if (fmt->fourcc == fourcc)
<------><------><------>return fmt;
<------>}
 
<------>return NULL;
}
 
static void __find_outer_frame_size(struct stm32_dcmi *dcmi,
<------><------><------><------>    struct v4l2_pix_format *pix,
<------><------><------><------>    struct dcmi_framesize *framesize)
{
<------>struct dcmi_framesize *match = NULL;
<------>unsigned int i;
<------>unsigned int min_err = UINT_MAX;
 
<------>for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
<------><------>struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
<------><------>int w_err = (fsize->width - pix->width);
<------><------>int h_err = (fsize->height - pix->height);
<------><------>int err = w_err + h_err;
 
<------><------>if (w_err >= 0 && h_err >= 0 && err < min_err) {
<------><------><------>min_err = err;
<------><------><------>match = fsize;
<------><------>}
<------>}
<------>if (!match)
<------><------>match = &dcmi->sd_framesizes[0];
 
<------>*framesize = *match;
}
 
static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
<------><------><------>const struct dcmi_format **sd_format,
<------><------><------>struct dcmi_framesize *sd_framesize)
{
<------>const struct dcmi_format *sd_fmt;
<------>struct dcmi_framesize sd_fsize;
<------>struct v4l2_pix_format *pix = &f->fmt.pix;
<------>struct v4l2_subdev_pad_config pad_cfg;
<------>struct v4l2_subdev_format format = {
<------><------>.which = V4L2_SUBDEV_FORMAT_TRY,
<------>};
<------>bool do_crop;
<------>int ret;
 
<------>sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
<------>if (!sd_fmt) {
<------><------>if (!dcmi->num_of_sd_formats)
<------><------><------>return -ENODATA;
 
<------><------>sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
<------><------>pix->pixelformat = sd_fmt->fourcc;
<------>}
 
<------>/* Limit to hardware capabilities */
<------>pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
<------>pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
 
<------>/* No crop if JPEG is requested */
<------>do_crop = dcmi->do_crop && (pix->pixelformat != V4L2_PIX_FMT_JPEG);
 
<------>if (do_crop && dcmi->num_of_sd_framesizes) {
<------><------>struct dcmi_framesize outer_sd_fsize;
<------><------>/*
<------><------> * If crop is requested and sensor have discrete frame sizes,
<------><------> * select the frame size that is just larger than request
<------><------> */
<------><------>__find_outer_frame_size(dcmi, pix, &outer_sd_fsize);
<------><------>pix->width = outer_sd_fsize.width;
<------><------>pix->height = outer_sd_fsize.height;
<------>}
 
<------>v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
<------>ret = v4l2_subdev_call(dcmi->entity.source, pad, set_fmt,
<------><------><------>       &pad_cfg, &format);
<------>if (ret < 0)
<------><------>return ret;
 
<------>/* Update pix regarding to what sensor can do */
<------>v4l2_fill_pix_format(pix, &format.format);
 
<------>/* Save resolution that sensor can actually do */
<------>sd_fsize.width = pix->width;
<------>sd_fsize.height = pix->height;
 
<------>if (do_crop) {
<------><------>struct v4l2_rect c = dcmi->crop;
<------><------>struct v4l2_rect max_rect;
 
<------><------>/*
<------><------> * Adjust crop by making the intersection between
<------><------> * format resolution request and crop request
<------><------> */
<------><------>max_rect.top = 0;
<------><------>max_rect.left = 0;
<------><------>max_rect.width = pix->width;
<------><------>max_rect.height = pix->height;
<------><------>v4l2_rect_map_inside(&c, &max_rect);
<------><------>c.top  = clamp_t(s32, c.top, 0, pix->height - c.height);
<------><------>c.left = clamp_t(s32, c.left, 0, pix->width - c.width);
<------><------>dcmi->crop = c;
 
<------><------>/* Adjust format resolution request to crop */
<------><------>pix->width = dcmi->crop.width;
<------><------>pix->height = dcmi->crop.height;
<------>}
 
<------>pix->field = V4L2_FIELD_NONE;
<------>pix->bytesperline = pix->width * sd_fmt->bpp;
<------>pix->sizeimage = pix->bytesperline * pix->height;
 
<------>if (sd_format)
<------><------>*sd_format = sd_fmt;
<------>if (sd_framesize)
<------><------>*sd_framesize = sd_fsize;
 
<------>return 0;
}
 
static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
{
<------>struct v4l2_subdev_format format = {
<------><------>.which = V4L2_SUBDEV_FORMAT_ACTIVE,
<------>};
<------>const struct dcmi_format *sd_format;
<------>struct dcmi_framesize sd_framesize;
<------>struct v4l2_mbus_framefmt *mf = &format.format;
<------>struct v4l2_pix_format *pix = &f->fmt.pix;
<------>int ret;
 
<------>/*
<------> * Try format, fmt.width/height could have been changed
<------> * to match sensor capability or crop request
<------> * sd_format & sd_framesize will contain what subdev
<------> * can do for this request.
<------> */
<------>ret = dcmi_try_fmt(dcmi, f, &sd_format, &sd_framesize);
<------>if (ret)
<------><------>return ret;
 
<------>/* Disable crop if JPEG is requested */
<------>if (pix->pixelformat == V4L2_PIX_FMT_JPEG)
<------><------>dcmi->do_crop = false;
 
<------>/* pix to mbus format */
<------>v4l2_fill_mbus_format(mf, pix,
<------><------><------>      sd_format->mbus_code);
<------>mf->width = sd_framesize.width;
<------>mf->height = sd_framesize.height;
 
<------>ret = dcmi_pipeline_s_fmt(dcmi, NULL, &format);
<------>if (ret < 0)
<------><------>return ret;
 
<------>dev_dbg(dcmi->dev, "Sensor format set to 0x%x %ux%u\n",
<------><------>mf->code, mf->width, mf->height);
<------>dev_dbg(dcmi->dev, "Buffer format set to %4.4s %ux%u\n",
<------><------>(char *)&pix->pixelformat,
<------><------>pix->width, pix->height);
 
<------>dcmi->fmt = *f;
<------>dcmi->sd_format = sd_format;
<------>dcmi->sd_framesize = sd_framesize;
 
<------>return 0;
}
 
static int dcmi_s_fmt_vid_cap(struct file *file, void *priv,
<------><------><------>      struct v4l2_format *f)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
 
<------>if (vb2_is_streaming(&dcmi->queue))
<------><------>return -EBUSY;
 
<------>return dcmi_set_fmt(dcmi, f);
}
 
static int dcmi_try_fmt_vid_cap(struct file *file, void *priv,
<------><------><------><------>struct v4l2_format *f)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
 
<------>return dcmi_try_fmt(dcmi, f, NULL, NULL);
}
 
static int dcmi_enum_fmt_vid_cap(struct file *file, void  *priv,
<------><------><------><------> struct v4l2_fmtdesc *f)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
 
<------>if (f->index >= dcmi->num_of_sd_formats)
<------><------>return -EINVAL;
 
<------>f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
<------>return 0;
}
 
static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi,
<------><------><------><------>  struct v4l2_pix_format *pix)
{
<------>struct v4l2_subdev_format fmt = {
<------><------>.which = V4L2_SUBDEV_FORMAT_ACTIVE,
<------>};
<------>int ret;
 
<------>ret = v4l2_subdev_call(dcmi->entity.source, pad, get_fmt, NULL, &fmt);
<------>if (ret)
<------><------>return ret;
 
<------>v4l2_fill_pix_format(pix, &fmt.format);
 
<------>return 0;
}
 
static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
<------><------><------><------>  struct v4l2_pix_format *pix)
{
<------>const struct dcmi_format *sd_fmt;
<------>struct v4l2_subdev_format format = {
<------><------>.which = V4L2_SUBDEV_FORMAT_TRY,
<------>};
<------>struct v4l2_subdev_pad_config pad_cfg;
<------>int ret;
 
<------>sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
<------>if (!sd_fmt) {
<------><------>if (!dcmi->num_of_sd_formats)
<------><------><------>return -ENODATA;
 
<------><------>sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
<------><------>pix->pixelformat = sd_fmt->fourcc;
<------>}
 
<------>v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
<------>ret = v4l2_subdev_call(dcmi->entity.source, pad, set_fmt,
<------><------><------>       &pad_cfg, &format);
<------>if (ret < 0)
<------><------>return ret;
 
<------>return 0;
}
 
static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi,
<------><------><------><------>  struct v4l2_rect *r)
{
<------>struct v4l2_subdev_selection bounds = {
<------><------>.which = V4L2_SUBDEV_FORMAT_ACTIVE,
<------><------>.target = V4L2_SEL_TGT_CROP_BOUNDS,
<------>};
<------>unsigned int max_width, max_height, max_pixsize;
<------>struct v4l2_pix_format pix;
<------>unsigned int i;
<------>int ret;
 
<------>/*
<------> * Get sensor bounds first
<------> */
<------>ret = v4l2_subdev_call(dcmi->entity.source, pad, get_selection,
<------><------><------>       NULL, &bounds);
<------>if (!ret)
<------><------>*r = bounds.r;
<------>if (ret != -ENOIOCTLCMD)
<------><------>return ret;
 
<------>/*
<------> * If selection is not implemented,
<------> * fallback by enumerating sensor frame sizes
<------> * and take the largest one
<------> */
<------>max_width = 0;
<------>max_height = 0;
<------>max_pixsize = 0;
<------>for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
<------><------>struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
<------><------>unsigned int pixsize = fsize->width * fsize->height;
 
<------><------>if (pixsize > max_pixsize) {
<------><------><------>max_pixsize = pixsize;
<------><------><------>max_width = fsize->width;
<------><------><------>max_height = fsize->height;
<------><------>}
<------>}
<------>if (max_pixsize > 0) {
<------><------>r->top = 0;
<------><------>r->left = 0;
<------><------>r->width = max_width;
<------><------>r->height = max_height;
<------><------>return 0;
<------>}
 
<------>/*
<------> * If frame sizes enumeration is not implemented,
<------> * fallback by getting current sensor frame size
<------> */
<------>ret = dcmi_get_sensor_format(dcmi, &pix);
<------>if (ret)
<------><------>return ret;
 
<------>r->top = 0;
<------>r->left = 0;
<------>r->width = pix.width;
<------>r->height = pix.height;
 
<------>return 0;
}
 
static int dcmi_g_selection(struct file *file, void *fh,
<------><------><------>    struct v4l2_selection *s)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
 
<------>if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
<------><------>return -EINVAL;
 
<------>switch (s->target) {
<------>case V4L2_SEL_TGT_CROP_DEFAULT:
<------>case V4L2_SEL_TGT_CROP_BOUNDS:
<------><------>s->r = dcmi->sd_bounds;
<------><------>return 0;
<------>case V4L2_SEL_TGT_CROP:
<------><------>if (dcmi->do_crop) {
<------><------><------>s->r = dcmi->crop;
<------><------>} else {
<------><------><------>s->r.top = 0;
<------><------><------>s->r.left = 0;
<------><------><------>s->r.width = dcmi->fmt.fmt.pix.width;
<------><------><------>s->r.height = dcmi->fmt.fmt.pix.height;
<------><------>}
<------><------>break;
<------>default:
<------><------>return -EINVAL;
<------>}
 
<------>return 0;
}
 
static int dcmi_s_selection(struct file *file, void *priv,
<------><------><------>    struct v4l2_selection *s)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
<------>struct v4l2_rect r = s->r;
<------>struct v4l2_rect max_rect;
<------>struct v4l2_pix_format pix;
 
<------>if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
<------>    s->target != V4L2_SEL_TGT_CROP)
<------><------>return -EINVAL;
 
<------>/* Reset sensor resolution to max resolution */
<------>pix.pixelformat = dcmi->fmt.fmt.pix.pixelformat;
<------>pix.width = dcmi->sd_bounds.width;
<------>pix.height = dcmi->sd_bounds.height;
<------>dcmi_set_sensor_format(dcmi, &pix);
 
<------>/*
<------> * Make the intersection between
<------> * sensor resolution
<------> * and crop request
<------> */
<------>max_rect.top = 0;
<------>max_rect.left = 0;
<------>max_rect.width = pix.width;
<------>max_rect.height = pix.height;
<------>v4l2_rect_map_inside(&r, &max_rect);
<------>r.top  = clamp_t(s32, r.top, 0, pix.height - r.height);
<------>r.left = clamp_t(s32, r.left, 0, pix.width - r.width);
 
<------>if (!(r.top == dcmi->sd_bounds.top &&
<------>      r.left == dcmi->sd_bounds.left &&
<------>      r.width == dcmi->sd_bounds.width &&
<------>      r.height == dcmi->sd_bounds.height)) {
<------><------>/* Crop if request is different than sensor resolution */
<------><------>dcmi->do_crop = true;
<------><------>dcmi->crop = r;
<------><------>dev_dbg(dcmi->dev, "s_selection: crop %ux%u@(%u,%u) from %ux%u\n",
<------><------><------>r.width, r.height, r.left, r.top,
<------><------><------>pix.width, pix.height);
<------>} else {
<------><------>/* Disable crop */
<------><------>dcmi->do_crop = false;
<------><------>dev_dbg(dcmi->dev, "s_selection: crop is disabled\n");
<------>}
 
<------>s->r = r;
<------>return 0;
}
 
static int dcmi_querycap(struct file *file, void *priv,
<------><------><------> struct v4l2_capability *cap)
{
<------>strscpy(cap->driver, DRV_NAME, sizeof(cap->driver));
<------>strscpy(cap->card, "STM32 Camera Memory Interface",
<------><------>sizeof(cap->card));
<------>strscpy(cap->bus_info, "platform:dcmi", sizeof(cap->bus_info));
<------>return 0;
}
 
static int dcmi_enum_input(struct file *file, void *priv,
<------><------><------>   struct v4l2_input *i)
{
<------>if (i->index != 0)
<------><------>return -EINVAL;
 
<------>i->type = V4L2_INPUT_TYPE_CAMERA;
<------>strscpy(i->name, "Camera", sizeof(i->name));
<------>return 0;
}
 
static int dcmi_g_input(struct file *file, void *priv, unsigned int *i)
{
<------>*i = 0;
<------>return 0;
}
 
static int dcmi_s_input(struct file *file, void *priv, unsigned int i)
{
<------>if (i > 0)
<------><------>return -EINVAL;
<------>return 0;
}
 
static int dcmi_enum_framesizes(struct file *file, void *fh,
<------><------><------><------>struct v4l2_frmsizeenum *fsize)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
<------>const struct dcmi_format *sd_fmt;
<------>struct v4l2_subdev_frame_size_enum fse = {
<------><------>.index = fsize->index,
<------><------>.which = V4L2_SUBDEV_FORMAT_ACTIVE,
<------>};
<------>int ret;
 
<------>sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
<------>if (!sd_fmt)
<------><------>return -EINVAL;
 
<------>fse.code = sd_fmt->mbus_code;
 
<------>ret = v4l2_subdev_call(dcmi->entity.source, pad, enum_frame_size,
<------><------><------>       NULL, &fse);
<------>if (ret)
<------><------>return ret;
 
<------>fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
<------>fsize->discrete.width = fse.max_width;
<------>fsize->discrete.height = fse.max_height;
 
<------>return 0;
}
 
static int dcmi_g_parm(struct file *file, void *priv,
<------><------>       struct v4l2_streamparm *p)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
 
<------>return v4l2_g_parm_cap(video_devdata(file), dcmi->entity.source, p);
}
 
static int dcmi_s_parm(struct file *file, void *priv,
<------><------>       struct v4l2_streamparm *p)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
 
<------>return v4l2_s_parm_cap(video_devdata(file), dcmi->entity.source, p);
}
 
static int dcmi_enum_frameintervals(struct file *file, void *fh,
<------><------><------><------>    struct v4l2_frmivalenum *fival)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
<------>const struct dcmi_format *sd_fmt;
<------>struct v4l2_subdev_frame_interval_enum fie = {
<------><------>.index = fival->index,
<------><------>.width = fival->width,
<------><------>.height = fival->height,
<------><------>.which = V4L2_SUBDEV_FORMAT_ACTIVE,
<------>};
<------>int ret;
 
<------>sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
<------>if (!sd_fmt)
<------><------>return -EINVAL;
 
<------>fie.code = sd_fmt->mbus_code;
 
<------>ret = v4l2_subdev_call(dcmi->entity.source, pad,
<------><------><------>       enum_frame_interval, NULL, &fie);
<------>if (ret)
<------><------>return ret;
 
<------>fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
<------>fival->discrete = fie.interval;
 
<------>return 0;
}
 
static const struct of_device_id stm32_dcmi_of_match[] = {
<------>{ .compatible = "st,stm32-dcmi"},
<------>{ /* end node */ },
};
MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match);
 
static int dcmi_open(struct file *file)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
<------>struct v4l2_subdev *sd = dcmi->entity.source;
<------>int ret;
 
<------>if (mutex_lock_interruptible(&dcmi->lock))
<------><------>return -ERESTARTSYS;
 
<------>ret = v4l2_fh_open(file);
<------>if (ret < 0)
<------><------>goto unlock;
 
<------>if (!v4l2_fh_is_singular_file(file))
<------><------>goto fh_rel;
 
<------>ret = v4l2_subdev_call(sd, core, s_power, 1);
<------>if (ret < 0 && ret != -ENOIOCTLCMD)
<------><------>goto fh_rel;
 
<------>ret = dcmi_set_fmt(dcmi, &dcmi->fmt);
<------>if (ret)
<------><------>v4l2_subdev_call(sd, core, s_power, 0);
fh_rel:
<------>if (ret)
<------><------>v4l2_fh_release(file);
unlock:
<------>mutex_unlock(&dcmi->lock);
<------>return ret;
}
 
static int dcmi_release(struct file *file)
{
<------>struct stm32_dcmi *dcmi = video_drvdata(file);
<------>struct v4l2_subdev *sd = dcmi->entity.source;
<------>bool fh_singular;
<------>int ret;
 
<------>mutex_lock(&dcmi->lock);
 
<------>fh_singular = v4l2_fh_is_singular_file(file);
 
<------>ret = _vb2_fop_release(file, NULL);
 
<------>if (fh_singular)
<------><------>v4l2_subdev_call(sd, core, s_power, 0);
 
<------>mutex_unlock(&dcmi->lock);
 
<------>return ret;
}
 
static const struct v4l2_ioctl_ops dcmi_ioctl_ops = {
<------>.vidioc_querycap		= dcmi_querycap,
 
<------>.vidioc_try_fmt_vid_cap		= dcmi_try_fmt_vid_cap,
<------>.vidioc_g_fmt_vid_cap		= dcmi_g_fmt_vid_cap,
<------>.vidioc_s_fmt_vid_cap		= dcmi_s_fmt_vid_cap,
<------>.vidioc_enum_fmt_vid_cap	= dcmi_enum_fmt_vid_cap,
<------>.vidioc_g_selection		= dcmi_g_selection,
<------>.vidioc_s_selection		= dcmi_s_selection,
 
<------>.vidioc_enum_input		= dcmi_enum_input,
<------>.vidioc_g_input			= dcmi_g_input,
<------>.vidioc_s_input			= dcmi_s_input,
 
<------>.vidioc_g_parm			= dcmi_g_parm,
<------>.vidioc_s_parm			= dcmi_s_parm,
 
<------>.vidioc_enum_framesizes		= dcmi_enum_framesizes,
<------>.vidioc_enum_frameintervals	= dcmi_enum_frameintervals,
 
<------>.vidioc_reqbufs			= vb2_ioctl_reqbufs,
<------>.vidioc_create_bufs		= vb2_ioctl_create_bufs,
<------>.vidioc_querybuf		= vb2_ioctl_querybuf,
<------>.vidioc_qbuf			= vb2_ioctl_qbuf,
<------>.vidioc_dqbuf			= vb2_ioctl_dqbuf,
<------>.vidioc_expbuf			= vb2_ioctl_expbuf,
<------>.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
<------>.vidioc_streamon		= vb2_ioctl_streamon,
<------>.vidioc_streamoff		= vb2_ioctl_streamoff,
 
<------>.vidioc_log_status		= v4l2_ctrl_log_status,
<------>.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
<------>.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
};
 
static const struct v4l2_file_operations dcmi_fops = {
<------>.owner		= THIS_MODULE,
<------>.unlocked_ioctl	= video_ioctl2,
<------>.open		= dcmi_open,
<------>.release	= dcmi_release,
<------>.poll		= vb2_fop_poll,
<------>.mmap		= vb2_fop_mmap,
#ifndef CONFIG_MMU
<------>.get_unmapped_area = vb2_fop_get_unmapped_area,
#endif
<------>.read		= vb2_fop_read,
};
 
static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
{
<------>struct v4l2_format f = {
<------><------>.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
<------><------>.fmt.pix = {
<------><------><------>.width		= CIF_WIDTH,
<------><------><------>.height		= CIF_HEIGHT,
<------><------><------>.field		= V4L2_FIELD_NONE,
<------><------><------>.pixelformat	= dcmi->sd_formats[0]->fourcc,
<------><------>},
<------>};
<------>int ret;
 
<------>ret = dcmi_try_fmt(dcmi, &f, NULL, NULL);
<------>if (ret)
<------><------>return ret;
<------>dcmi->sd_format = dcmi->sd_formats[0];
<------>dcmi->fmt = f;
<------>return 0;
}
 
/*
 * FIXME: For the time being we only support subdevices
 * which expose RGB & YUV "parallel form" mbus code (_2X8).
 * Nevertheless, this allows to support serial source subdevices
 * and serial to parallel bridges which conform to this.
 */
static const struct dcmi_format dcmi_formats[] = {
<------>{
<------><------>.fourcc = V4L2_PIX_FMT_RGB565,
<------><------>.mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
<------><------>.bpp = 2,
<------>}, {
<------><------>.fourcc = V4L2_PIX_FMT_YUYV,
<------><------>.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
<------><------>.bpp = 2,
<------>}, {
<------><------>.fourcc = V4L2_PIX_FMT_UYVY,
<------><------>.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
<------><------>.bpp = 2,
<------>}, {
<------><------>.fourcc = V4L2_PIX_FMT_JPEG,
<------><------>.mbus_code = MEDIA_BUS_FMT_JPEG_1X8,
<------><------>.bpp = 1,
<------>},
};
 
static int dcmi_formats_init(struct stm32_dcmi *dcmi)
{
<------>const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
<------>unsigned int num_fmts = 0, i, j;
<------>struct v4l2_subdev *subdev = dcmi->entity.source;
<------>struct v4l2_subdev_mbus_code_enum mbus_code = {
<------><------>.which = V4L2_SUBDEV_FORMAT_ACTIVE,
<------>};
 
<------>while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
<------><------><------><------> NULL, &mbus_code)) {
<------><------>for (i = 0; i < ARRAY_SIZE(dcmi_formats); i++) {
<------><------><------>if (dcmi_formats[i].mbus_code != mbus_code.code)
<------><------><------><------>continue;
 
<------><------><------>/* Code supported, have we got this fourcc yet? */
<------><------><------>for (j = 0; j < num_fmts; j++)
<------><------><------><------>if (sd_fmts[j]->fourcc ==
<------><------><------><------><------><------>dcmi_formats[i].fourcc) {
<------><------><------><------><------>/* Already available */
<------><------><------><------><------>dev_dbg(dcmi->dev, "Skipping fourcc/code: %4.4s/0x%x\n",
<------><------><------><------><------><------>(char *)&sd_fmts[j]->fourcc,
<------><------><------><------><------><------>mbus_code.code);
<------><------><------><------><------>break;
<------><------><------><------>}
<------><------><------>if (j == num_fmts) {
<------><------><------><------>/* New */
<------><------><------><------>sd_fmts[num_fmts++] = dcmi_formats + i;
<------><------><------><------>dev_dbg(dcmi->dev, "Supported fourcc/code: %4.4s/0x%x\n",
<------><------><------><------><------>(char *)&sd_fmts[num_fmts - 1]->fourcc,
<------><------><------><------><------>sd_fmts[num_fmts - 1]->mbus_code);
<------><------><------>}
<------><------>}
<------><------>mbus_code.index++;
<------>}
 
<------>if (!num_fmts)
<------><------>return -ENXIO;
 
<------>dcmi->num_of_sd_formats = num_fmts;
<------>dcmi->sd_formats = devm_kcalloc(dcmi->dev,
<------><------><------><------><------>num_fmts, sizeof(struct dcmi_format *),
<------><------><------><------><------>GFP_KERNEL);
<------>if (!dcmi->sd_formats) {
<------><------>dev_err(dcmi->dev, "Could not allocate memory\n");
<------><------>return -ENOMEM;
<------>}
 
<------>memcpy(dcmi->sd_formats, sd_fmts,
<------>       num_fmts * sizeof(struct dcmi_format *));
<------>dcmi->sd_format = dcmi->sd_formats[0];
 
<------>return 0;
}
 
static int dcmi_framesizes_init(struct stm32_dcmi *dcmi)
{
<------>unsigned int num_fsize = 0;
<------>struct v4l2_subdev *subdev = dcmi->entity.source;
<------>struct v4l2_subdev_frame_size_enum fse = {
<------><------>.which = V4L2_SUBDEV_FORMAT_ACTIVE,
<------><------>.code = dcmi->sd_format->mbus_code,
<------>};
<------>unsigned int ret;
<------>unsigned int i;
 
<------>/* Allocate discrete framesizes array */
<------>while (!v4l2_subdev_call(subdev, pad, enum_frame_size,
<------><------><------><------> NULL, &fse))
<------><------>fse.index++;
 
<------>num_fsize = fse.index;
<------>if (!num_fsize)
<------><------>return 0;
 
<------>dcmi->num_of_sd_framesizes = num_fsize;
<------>dcmi->sd_framesizes = devm_kcalloc(dcmi->dev, num_fsize,
<------><------><------><------><------>   sizeof(struct dcmi_framesize),
<------><------><------><------><------>   GFP_KERNEL);
<------>if (!dcmi->sd_framesizes) {
<------><------>dev_err(dcmi->dev, "Could not allocate memory\n");
<------><------>return -ENOMEM;
<------>}
 
<------>/* Fill array with sensor supported framesizes */
<------>dev_dbg(dcmi->dev, "Sensor supports %u frame sizes:\n", num_fsize);
<------>for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
<------><------>fse.index = i;
<------><------>ret = v4l2_subdev_call(subdev, pad, enum_frame_size,
<------><------><------><------>       NULL, &fse);
<------><------>if (ret)
<------><------><------>return ret;
<------><------>dcmi->sd_framesizes[fse.index].width = fse.max_width;
<------><------>dcmi->sd_framesizes[fse.index].height = fse.max_height;
<------><------>dev_dbg(dcmi->dev, "%ux%u\n", fse.max_width, fse.max_height);
<------>}
 
<------>return 0;
}
 
static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
{
<------>struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
<------>int ret;
 
<------>/*
<------> * Now that the graph is complete,
<------> * we search for the source subdevice
<------> * in order to expose it through V4L2 interface
<------> */
<------>dcmi->entity.source =
<------><------>media_entity_to_v4l2_subdev(dcmi_find_source(dcmi));
<------>if (!dcmi->entity.source) {
<------><------>dev_err(dcmi->dev, "Source subdevice not found\n");
<------><------>return -ENODEV;
<------>}
 
<------>dcmi->vdev->ctrl_handler = dcmi->entity.source->ctrl_handler;
 
<------>ret = dcmi_formats_init(dcmi);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "No supported mediabus format found\n");
<------><------>return ret;
<------>}
 
<------>ret = dcmi_framesizes_init(dcmi);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "Could not initialize framesizes\n");
<------><------>return ret;
<------>}
 
<------>ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "Could not get sensor bounds\n");
<------><------>return ret;
<------>}
 
<------>ret = dcmi_set_default_fmt(dcmi);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "Could not set default format\n");
<------><------>return ret;
<------>}
 
<------>ret = devm_request_threaded_irq(dcmi->dev, dcmi->irq, dcmi_irq_callback,
<------><------><------><------><------>dcmi_irq_thread, IRQF_ONESHOT,
<------><------><------><------><------>dev_name(dcmi->dev), dcmi);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "Unable to request irq %d\n", dcmi->irq);
<------><------>return ret;
<------>}
 
<------>return 0;
}
 
static void dcmi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
<------><------><------><------>     struct v4l2_subdev *sd,
<------><------><------><------>     struct v4l2_async_subdev *asd)
{
<------>struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
 
<------>dev_dbg(dcmi->dev, "Removing %s\n", video_device_node_name(dcmi->vdev));
 
<------>/* Checks internally if vdev has been init or not */
<------>video_unregister_device(dcmi->vdev);
}
 
static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
<------><------><------><------>   struct v4l2_subdev *subdev,
<------><------><------><------>   struct v4l2_async_subdev *asd)
{
<------>struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
<------>unsigned int ret;
<------>int src_pad;
 
<------>dev_dbg(dcmi->dev, "Subdev \"%s\" bound\n", subdev->name);
 
<------>/*
<------> * Link this sub-device to DCMI, it could be
<------> * a parallel camera sensor or a bridge
<------> */
<------>src_pad = media_entity_get_fwnode_pad(&subdev->entity,
<------><------><------><------><------>      subdev->fwnode,
<------><------><------><------><------>      MEDIA_PAD_FL_SOURCE);
 
<------>ret = media_create_pad_link(&subdev->entity, src_pad,
<------><------><------><------>    &dcmi->vdev->entity, 0,
<------><------><------><------>    MEDIA_LNK_FL_IMMUTABLE |
<------><------><------><------>    MEDIA_LNK_FL_ENABLED);
<------>if (ret)
<------><------>dev_err(dcmi->dev, "Failed to create media pad link with subdev \"%s\"\n",
<------><------><------>subdev->name);
<------>else
<------><------>dev_dbg(dcmi->dev, "DCMI is now linked to \"%s\"\n",
<------><------><------>subdev->name);
 
<------>return ret;
}
 
static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = {
<------>.bound = dcmi_graph_notify_bound,
<------>.unbind = dcmi_graph_notify_unbind,
<------>.complete = dcmi_graph_notify_complete,
};
 
static int dcmi_graph_parse(struct stm32_dcmi *dcmi, struct device_node *node)
{
<------>struct device_node *ep = NULL;
<------>struct device_node *remote;
 
<------>ep = of_graph_get_next_endpoint(node, ep);
<------>if (!ep)
<------><------>return -EINVAL;
 
<------>remote = of_graph_get_remote_port_parent(ep);
<------>of_node_put(ep);
<------>if (!remote)
<------><------>return -EINVAL;
 
<------>/* Remote node to connect */
<------>dcmi->entity.remote_node = remote;
<------>dcmi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
<------>dcmi->entity.asd.match.fwnode = of_fwnode_handle(remote);
<------>return 0;
}
 
static int dcmi_graph_init(struct stm32_dcmi *dcmi)
{
<------>int ret;
 
<------>/* Parse the graph to extract a list of subdevice DT nodes. */
<------>ret = dcmi_graph_parse(dcmi, dcmi->dev->of_node);
<------>if (ret < 0) {
<------><------>dev_err(dcmi->dev, "Failed to parse graph\n");
<------><------>return ret;
<------>}
 
<------>v4l2_async_notifier_init(&dcmi->notifier);
 
<------>ret = v4l2_async_notifier_add_subdev(&dcmi->notifier,
<------><------><------><------><------>     &dcmi->entity.asd);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "Failed to add subdev notifier\n");
<------><------>of_node_put(dcmi->entity.remote_node);
<------><------>return ret;
<------>}
 
<------>dcmi->notifier.ops = &dcmi_graph_notify_ops;
 
<------>ret = v4l2_async_notifier_register(&dcmi->v4l2_dev, &dcmi->notifier);
<------>if (ret < 0) {
<------><------>dev_err(dcmi->dev, "Failed to register notifier\n");
<------><------>v4l2_async_notifier_cleanup(&dcmi->notifier);
<------><------>return ret;
<------>}
 
<------>return 0;
}
 
static int dcmi_probe(struct platform_device *pdev)
{
<------>struct device_node *np = pdev->dev.of_node;
<------>const struct of_device_id *match = NULL;
<------>struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
<------>struct stm32_dcmi *dcmi;
<------>struct vb2_queue *q;
<------>struct dma_chan *chan;
<------>struct clk *mclk;
<------>int irq;
<------>int ret = 0;
 
<------>match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev);
<------>if (!match) {
<------><------>dev_err(&pdev->dev, "Could not find a match in devicetree\n");
<------><------>return -ENODEV;
<------>}
 
<------>dcmi = devm_kzalloc(&pdev->dev, sizeof(struct stm32_dcmi), GFP_KERNEL);
<------>if (!dcmi)
<------><------>return -ENOMEM;
 
<------>dcmi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
<------>if (IS_ERR(dcmi->rstc)) {
<------><------>dev_err(&pdev->dev, "Could not get reset control\n");
<------><------>return PTR_ERR(dcmi->rstc);
<------>}
 
<------>/* Get bus characteristics from devicetree */
<------>np = of_graph_get_next_endpoint(np, NULL);
<------>if (!np) {
<------><------>dev_err(&pdev->dev, "Could not find the endpoint\n");
<------><------>return -ENODEV;
<------>}
 
<------>ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
<------>of_node_put(np);
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "Could not parse the endpoint\n");
<------><------>return ret;
<------>}
 
<------>if (ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
<------><------>dev_err(&pdev->dev, "CSI bus not supported\n");
<------><------>return -ENODEV;
<------>}
<------>dcmi->bus.flags = ep.bus.parallel.flags;
<------>dcmi->bus.bus_width = ep.bus.parallel.bus_width;
<------>dcmi->bus.data_shift = ep.bus.parallel.data_shift;
 
<------>irq = platform_get_irq(pdev, 0);
<------>if (irq <= 0)
<------><------>return irq ? irq : -ENXIO;
 
<------>dcmi->irq = irq;
 
<------>dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
<------>if (!dcmi->res) {
<------><------>dev_err(&pdev->dev, "Could not get resource\n");
<------><------>return -ENODEV;
<------>}
 
<------>dcmi->regs = devm_ioremap_resource(&pdev->dev, dcmi->res);
<------>if (IS_ERR(dcmi->regs)) {
<------><------>dev_err(&pdev->dev, "Could not map registers\n");
<------><------>return PTR_ERR(dcmi->regs);
<------>}
 
<------>mclk = devm_clk_get(&pdev->dev, "mclk");
<------>if (IS_ERR(mclk)) {
<------><------>if (PTR_ERR(mclk) != -EPROBE_DEFER)
<------><------><------>dev_err(&pdev->dev, "Unable to get mclk\n");
<------><------>return PTR_ERR(mclk);
<------>}
 
<------>chan = dma_request_chan(&pdev->dev, "tx");
<------>if (IS_ERR(chan)) {
<------><------>ret = PTR_ERR(chan);
<------><------>if (ret != -EPROBE_DEFER)
<------><------><------>dev_err(&pdev->dev,
<------><------><------><------>"Failed to request DMA channel: %d\n", ret);
<------><------>return ret;
<------>}
 
<------>spin_lock_init(&dcmi->irqlock);
<------>mutex_init(&dcmi->lock);
<------>mutex_init(&dcmi->dma_lock);
<------>init_completion(&dcmi->complete);
<------>INIT_LIST_HEAD(&dcmi->buffers);
 
<------>dcmi->dev = &pdev->dev;
<------>dcmi->mclk = mclk;
<------>dcmi->state = STOPPED;
<------>dcmi->dma_chan = chan;
 
<------>q = &dcmi->queue;
 
<------>dcmi->v4l2_dev.mdev = &dcmi->mdev;
 
<------>/* Initialize media device */
<------>strscpy(dcmi->mdev.model, DRV_NAME, sizeof(dcmi->mdev.model));
<------>snprintf(dcmi->mdev.bus_info, sizeof(dcmi->mdev.bus_info),
<------><------> "platform:%s", DRV_NAME);
<------>dcmi->mdev.dev = &pdev->dev;
<------>media_device_init(&dcmi->mdev);
 
<------>/* Initialize the top-level structure */
<------>ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
<------>if (ret)
<------><------>goto err_media_device_cleanup;
 
<------>dcmi->vdev = video_device_alloc();
<------>if (!dcmi->vdev) {
<------><------>ret = -ENOMEM;
<------><------>goto err_device_unregister;
<------>}
 
<------>/* Video node */
<------>dcmi->vdev->fops = &dcmi_fops;
<------>dcmi->vdev->v4l2_dev = &dcmi->v4l2_dev;
<------>dcmi->vdev->queue = &dcmi->queue;
<------>strscpy(dcmi->vdev->name, KBUILD_MODNAME, sizeof(dcmi->vdev->name));
<------>dcmi->vdev->release = video_device_release;
<------>dcmi->vdev->ioctl_ops = &dcmi_ioctl_ops;
<------>dcmi->vdev->lock = &dcmi->lock;
<------>dcmi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
<------><------><------><------>  V4L2_CAP_READWRITE;
<------>video_set_drvdata(dcmi->vdev, dcmi);
 
<------>/* Media entity pads */
<------>dcmi->vid_cap_pad.flags = MEDIA_PAD_FL_SINK;
<------>ret = media_entity_pads_init(&dcmi->vdev->entity,
<------><------><------><------>     1, &dcmi->vid_cap_pad);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "Failed to init media entity pad\n");
<------><------>goto err_device_release;
<------>}
<------>dcmi->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
 
<------>ret = video_register_device(dcmi->vdev, VFL_TYPE_VIDEO, -1);
<------>if (ret) {
<------><------>dev_err(dcmi->dev, "Failed to register video device\n");
<------><------>goto err_media_entity_cleanup;
<------>}
 
<------>dev_dbg(dcmi->dev, "Device registered as %s\n",
<------><------>video_device_node_name(dcmi->vdev));
 
<------>/* Buffer queue */
<------>q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
<------>q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
<------>q->lock = &dcmi->lock;
<------>q->drv_priv = dcmi;
<------>q->buf_struct_size = sizeof(struct dcmi_buf);
<------>q->ops = &dcmi_video_qops;
<------>q->mem_ops = &vb2_dma_contig_memops;
<------>q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
<------>q->min_buffers_needed = 2;
<------>q->dev = &pdev->dev;
 
<------>ret = vb2_queue_init(q);
<------>if (ret < 0) {
<------><------>dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
<------><------>goto err_media_entity_cleanup;
<------>}
 
<------>ret = dcmi_graph_init(dcmi);
<------>if (ret < 0)
<------><------>goto err_media_entity_cleanup;
 
<------>/* Reset device */
<------>ret = reset_control_assert(dcmi->rstc);
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "Failed to assert the reset line\n");
<------><------>goto err_cleanup;
<------>}
 
<------>usleep_range(3000, 5000);
 
<------>ret = reset_control_deassert(dcmi->rstc);
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "Failed to deassert the reset line\n");
<------><------>goto err_cleanup;
<------>}
 
<------>dev_info(&pdev->dev, "Probe done\n");
 
<------>platform_set_drvdata(pdev, dcmi);
 
<------>pm_runtime_enable(&pdev->dev);
 
<------>return 0;
 
err_cleanup:
<------>v4l2_async_notifier_cleanup(&dcmi->notifier);
err_media_entity_cleanup:
<------>media_entity_cleanup(&dcmi->vdev->entity);
err_device_release:
<------>video_device_release(dcmi->vdev);
err_device_unregister:
<------>v4l2_device_unregister(&dcmi->v4l2_dev);
err_media_device_cleanup:
<------>media_device_cleanup(&dcmi->mdev);
<------>dma_release_channel(dcmi->dma_chan);
 
<------>return ret;
}
 
static int dcmi_remove(struct platform_device *pdev)
{
<------>struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
 
<------>pm_runtime_disable(&pdev->dev);
 
<------>v4l2_async_notifier_unregister(&dcmi->notifier);
<------>v4l2_async_notifier_cleanup(&dcmi->notifier);
<------>media_entity_cleanup(&dcmi->vdev->entity);
<------>v4l2_device_unregister(&dcmi->v4l2_dev);
<------>media_device_cleanup(&dcmi->mdev);
 
<------>dma_release_channel(dcmi->dma_chan);
 
<------>return 0;
}
 
static __maybe_unused int dcmi_runtime_suspend(struct device *dev)
{
<------>struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
 
<------>clk_disable_unprepare(dcmi->mclk);
 
<------>return 0;
}
 
static __maybe_unused int dcmi_runtime_resume(struct device *dev)
{
<------>struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
<------>int ret;
 
<------>ret = clk_prepare_enable(dcmi->mclk);
<------>if (ret)
<------><------>dev_err(dev, "%s: Failed to prepare_enable clock\n", __func__);
 
<------>return ret;
}
 
static __maybe_unused int dcmi_suspend(struct device *dev)
{
<------>/* disable clock */
<------>pm_runtime_force_suspend(dev);
 
<------>/* change pinctrl state */
<------>pinctrl_pm_select_sleep_state(dev);
 
<------>return 0;
}
 
static __maybe_unused int dcmi_resume(struct device *dev)
{
<------>/* restore pinctl default state */
<------>pinctrl_pm_select_default_state(dev);
 
<------>/* clock enable */
<------>pm_runtime_force_resume(dev);
 
<------>return 0;
}
 
static const struct dev_pm_ops dcmi_pm_ops = {
<------>SET_SYSTEM_SLEEP_PM_OPS(dcmi_suspend, dcmi_resume)
<------>SET_RUNTIME_PM_OPS(dcmi_runtime_suspend,
<------><------><------>   dcmi_runtime_resume, NULL)
};
 
static struct platform_driver stm32_dcmi_driver = {
<------>.probe		= dcmi_probe,
<------>.remove		= dcmi_remove,
<------>.driver		= {
<------><------>.name = DRV_NAME,
<------><------>.of_match_table = of_match_ptr(stm32_dcmi_of_match),
<------><------>.pm = &dcmi_pm_ops,
<------>},
};
 
module_platform_driver(stm32_dcmi_driver);
 
MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
MODULE_AUTHOR("Hugues Fruchet <hugues.fruchet@st.com>");
MODULE_DESCRIPTION("STMicroelectronics STM32 Digital Camera Memory Interface driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("video");