^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * HSI character device driver, implements the character device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2010 Nokia Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Contact: Andras Domokos <andras.domokos@nokia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/kmemleak.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/cdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/hsi/hsi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/hsi/hsi_char.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define HSC_DEVS 16 /* Num of channels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define HSC_MSGS 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define HSC_RXBREAK 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define HSC_ID_BITS 6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define HSC_PORT_ID_BITS 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define HSC_ID_MASK 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define HSC_PORT_ID_MASK 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define HSC_CH_MASK 0xf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * We support up to 4 controllers that can have up to 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * ports, which should currently be more than enough.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define HSC_BASEMINOR(id, port_id) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) ((((id) & HSC_ID_MASK) << HSC_ID_BITS) | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) (((port_id) & HSC_PORT_ID_MASK) << HSC_PORT_ID_BITS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) HSC_CH_OPEN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) HSC_CH_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) HSC_CH_WRITE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) HSC_CH_WLINE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) HSC_RX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) HSC_TX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct hsc_client_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * struct hsc_channel - hsi_char internal channel data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * @ch: channel number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * @flags: Keeps state of the channel (open/close, reading, writing)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * @free_msgs_list: List of free HSI messages/requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * @rx_msgs_queue: List of pending RX requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * @tx_msgs_queue: List of pending TX requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * @lock: Serialize access to the lists
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * @cl: reference to the associated hsi_client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * @cl_data: reference to the client data that this channels belongs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * @rx_wait: RX requests wait queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * @tx_wait: TX requests wait queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct hsc_channel {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) unsigned int ch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct list_head free_msgs_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct list_head rx_msgs_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct list_head tx_msgs_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct hsi_client *cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct hsc_client_data *cl_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) wait_queue_head_t rx_wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) wait_queue_head_t tx_wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * struct hsc_client_data - hsi_char internal client data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * @cdev: Characther device associated to the hsi_client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * @lock: Lock to serialize open/close access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * @flags: Keeps track of port state (rx hwbreak armed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * @usecnt: Use count for claiming the HSI port (mutex protected)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * @cl: Referece to the HSI client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * @channels: Array of channels accessible by the client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct hsc_client_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct cdev cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) unsigned int usecnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct hsi_client *cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct hsc_channel channels[HSC_DEVS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* Stores the major number dynamically allocated for hsi_char */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static unsigned int hsc_major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /* Maximum buffer size that hsi_char will accept from userspace */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static unsigned int max_data_size = 0x1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) module_param(max_data_size, uint, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) MODULE_PARM_DESC(max_data_size, "max read/write data size [4,8..65536] (^2)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static void hsc_add_tail(struct hsc_channel *channel, struct hsi_msg *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct list_head *queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) spin_lock_irqsave(&channel->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) list_add_tail(&msg->link, queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) spin_unlock_irqrestore(&channel->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static struct hsi_msg *hsc_get_first_msg(struct hsc_channel *channel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct list_head *queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct hsi_msg *msg = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) spin_lock_irqsave(&channel->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (list_empty(queue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) msg = list_first_entry(queue, struct hsi_msg, link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) list_del(&msg->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) spin_unlock_irqrestore(&channel->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static inline void hsc_msg_free(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) kfree(sg_virt(msg->sgt.sgl));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) hsi_free_msg(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static void hsc_free_list(struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) struct hsi_msg *msg, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) list_for_each_entry_safe(msg, tmp, list, link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) list_del(&msg->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) hsc_msg_free(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static void hsc_reset_list(struct hsc_channel *channel, struct list_head *l)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) spin_lock_irqsave(&channel->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) list_splice_init(l, &list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) spin_unlock_irqrestore(&channel->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) hsc_free_list(&list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static inline struct hsi_msg *hsc_msg_alloc(unsigned int alloc_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) struct hsi_msg *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) void *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) msg = hsi_alloc_msg(1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (!msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) buf = kmalloc(alloc_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (!buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) hsi_free_msg(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) sg_init_one(msg->sgt.sgl, buf, alloc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* Ignore false positive, due to sg pointer handling */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) kmemleak_ignore(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static inline int hsc_msgs_alloc(struct hsc_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct hsi_msg *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) for (i = 0; i < HSC_MSGS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) msg = hsc_msg_alloc(max_data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (!msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) msg->channel = channel->ch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) list_add_tail(&msg->link, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) hsc_free_list(&channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static inline unsigned int hsc_msg_len_get(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) return msg->sgt.sgl->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static inline void hsc_msg_len_set(struct hsi_msg *msg, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) msg->sgt.sgl->length = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static void hsc_rx_completed(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) struct hsc_channel *channel = cl_data->channels + msg->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (test_bit(HSC_CH_READ, &channel->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) hsc_add_tail(channel, msg, &channel->rx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) wake_up(&channel->rx_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) hsc_add_tail(channel, msg, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static void hsc_rx_msg_destructor(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) msg->status = HSI_STATUS_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) hsc_msg_len_set(msg, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) hsc_rx_completed(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static void hsc_tx_completed(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) struct hsc_channel *channel = cl_data->channels + msg->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (test_bit(HSC_CH_WRITE, &channel->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) hsc_add_tail(channel, msg, &channel->tx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) wake_up(&channel->tx_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) hsc_add_tail(channel, msg, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static void hsc_tx_msg_destructor(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) msg->status = HSI_STATUS_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) hsc_msg_len_set(msg, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) hsc_tx_completed(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static void hsc_break_req_destructor(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) hsi_free_msg(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) clear_bit(HSC_RXBREAK, &cl_data->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static void hsc_break_received(struct hsi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) struct hsc_channel *channel = cl_data->channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) int i, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) /* Broadcast HWBREAK on all channels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) for (i = 0; i < HSC_DEVS; i++, channel++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) struct hsi_msg *msg2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (!test_bit(HSC_CH_READ, &channel->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) msg2 = hsc_get_first_msg(channel, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (!msg2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) clear_bit(HSC_CH_READ, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) hsc_msg_len_set(msg2, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) msg2->status = HSI_STATUS_COMPLETED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) hsc_add_tail(channel, msg2, &channel->rx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) wake_up(&channel->rx_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) hsi_flush(msg->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) ret = hsi_async_read(msg->cl, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) hsc_break_req_destructor(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static int hsc_break_request(struct hsi_client *cl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct hsc_client_data *cl_data = hsi_client_drvdata(cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) struct hsi_msg *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (test_and_set_bit(HSC_RXBREAK, &cl_data->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) msg = hsi_alloc_msg(0, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (!msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) clear_bit(HSC_RXBREAK, &cl_data->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) msg->break_frame = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) msg->complete = hsc_break_received;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) msg->destructor = hsc_break_req_destructor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) ret = hsi_async_read(cl, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) hsc_break_req_destructor(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static int hsc_break_send(struct hsi_client *cl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct hsi_msg *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) msg = hsi_alloc_msg(0, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (!msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) msg->break_frame = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) msg->complete = hsi_free_msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) msg->destructor = hsi_free_msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) ret = hsi_async_write(cl, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) hsi_free_msg(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) struct hsi_config tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if ((rxc->mode != HSI_MODE_STREAM) && (rxc->mode != HSI_MODE_FRAME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if ((rxc->channels == 0) || (rxc->channels > HSC_DEVS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (rxc->channels & (rxc->channels - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if ((rxc->flow != HSI_FLOW_SYNC) && (rxc->flow != HSI_FLOW_PIPE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) tmp = cl->rx_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) cl->rx_cfg.mode = rxc->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) cl->rx_cfg.num_hw_channels = rxc->channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) cl->rx_cfg.flow = rxc->flow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) ret = hsi_setup(cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) cl->rx_cfg = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (rxc->mode == HSI_MODE_FRAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) hsc_break_request(cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static inline void hsc_rx_get(struct hsi_client *cl, struct hsc_rx_config *rxc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) rxc->mode = cl->rx_cfg.mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) rxc->channels = cl->rx_cfg.num_hw_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) rxc->flow = cl->rx_cfg.flow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct hsi_config tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if ((txc->mode != HSI_MODE_STREAM) && (txc->mode != HSI_MODE_FRAME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if ((txc->channels == 0) || (txc->channels > HSC_DEVS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (txc->channels & (txc->channels - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if ((txc->arb_mode != HSI_ARB_RR) && (txc->arb_mode != HSI_ARB_PRIO))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) tmp = cl->tx_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) cl->tx_cfg.mode = txc->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) cl->tx_cfg.num_hw_channels = txc->channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) cl->tx_cfg.speed = txc->speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) cl->tx_cfg.arb_mode = txc->arb_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) ret = hsi_setup(cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) cl->tx_cfg = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static inline void hsc_tx_get(struct hsi_client *cl, struct hsc_tx_config *txc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) txc->mode = cl->tx_cfg.mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) txc->channels = cl->tx_cfg.num_hw_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) txc->speed = cl->tx_cfg.speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) txc->arb_mode = cl->tx_cfg.arb_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) static ssize_t hsc_read(struct file *file, char __user *buf, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) loff_t *ppos __maybe_unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) struct hsc_channel *channel = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) struct hsi_msg *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) if (!IS_ALIGNED(len, sizeof(u32)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (len > max_data_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) len = max_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (channel->ch >= channel->cl->rx_cfg.num_hw_channels)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return -ECHRNG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (test_and_set_bit(HSC_CH_READ, &channel->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) msg = hsc_get_first_msg(channel, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (!msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) ret = -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) hsc_msg_len_set(msg, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) msg->complete = hsc_rx_completed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) msg->destructor = hsc_rx_msg_destructor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) ret = hsi_async_read(channel->cl, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) hsc_add_tail(channel, msg, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) ret = wait_event_interruptible(channel->rx_wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) !list_empty(&channel->rx_msgs_queue));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) clear_bit(HSC_CH_READ, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) hsi_flush(channel->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) msg = hsc_get_first_msg(channel, &channel->rx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if (msg->status != HSI_STATUS_ERROR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) ret = copy_to_user((void __user *)buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) sg_virt(msg->sgt.sgl), hsc_msg_len_get(msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) ret = hsc_msg_len_get(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) hsc_add_tail(channel, msg, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) clear_bit(HSC_CH_READ, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) static ssize_t hsc_write(struct file *file, const char __user *buf, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) loff_t *ppos __maybe_unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) struct hsc_channel *channel = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) struct hsi_msg *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if ((len == 0) || !IS_ALIGNED(len, sizeof(u32)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (len > max_data_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) len = max_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (channel->ch >= channel->cl->tx_cfg.num_hw_channels)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) return -ECHRNG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (test_and_set_bit(HSC_CH_WRITE, &channel->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) msg = hsc_get_first_msg(channel, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (!msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) clear_bit(HSC_CH_WRITE, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (copy_from_user(sg_virt(msg->sgt.sgl), (void __user *)buf, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) hsc_msg_len_set(msg, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) msg->complete = hsc_tx_completed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) msg->destructor = hsc_tx_msg_destructor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) ret = hsi_async_write(channel->cl, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) ret = wait_event_interruptible(channel->tx_wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) !list_empty(&channel->tx_msgs_queue));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) clear_bit(HSC_CH_WRITE, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) hsi_flush(channel->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) msg = hsc_get_first_msg(channel, &channel->tx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (msg->status == HSI_STATUS_ERROR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) ret = hsc_msg_len_get(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) hsc_add_tail(channel, msg, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) clear_bit(HSC_CH_WRITE, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) static long hsc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) struct hsc_channel *channel = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) unsigned int state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) struct hsc_rx_config rxc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) struct hsc_tx_config txc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) long ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) case HSC_RESET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) hsi_flush(channel->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) case HSC_SET_PM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (copy_from_user(&state, (void __user *)arg, sizeof(state)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (state == HSC_PM_DISABLE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) if (test_and_set_bit(HSC_CH_WLINE, &channel->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) ret = hsi_start_tx(channel->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) } else if (state == HSC_PM_ENABLE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (!test_and_clear_bit(HSC_CH_WLINE, &channel->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ret = hsi_stop_tx(channel->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) case HSC_SEND_BREAK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return hsc_break_send(channel->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) case HSC_SET_RX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) if (copy_from_user(&rxc, (void __user *)arg, sizeof(rxc)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return hsc_rx_set(channel->cl, &rxc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) case HSC_GET_RX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) hsc_rx_get(channel->cl, &rxc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) if (copy_to_user((void __user *)arg, &rxc, sizeof(rxc)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) case HSC_SET_TX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if (copy_from_user(&txc, (void __user *)arg, sizeof(txc)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) return hsc_tx_set(channel->cl, &txc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) case HSC_GET_TX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) hsc_tx_get(channel->cl, &txc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) if (copy_to_user((void __user *)arg, &txc, sizeof(txc)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) static inline void __hsc_port_release(struct hsc_client_data *cl_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) BUG_ON(cl_data->usecnt == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (--cl_data->usecnt == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) hsi_flush(cl_data->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) hsi_release_port(cl_data->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) static int hsc_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) struct hsc_client_data *cl_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) struct hsc_channel *channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) pr_debug("open, minor = %d\n", iminor(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) cl_data = container_of(inode->i_cdev, struct hsc_client_data, cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) mutex_lock(&cl_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) channel = cl_data->channels + (iminor(inode) & HSC_CH_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) if (test_and_set_bit(HSC_CH_OPEN, &channel->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * Check if we have already claimed the port associated to the HSI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * client. If not then try to claim it, else increase its refcount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (cl_data->usecnt == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) ret = hsi_claim_port(cl_data->cl, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) hsi_setup(cl_data->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) cl_data->usecnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) ret = hsc_msgs_alloc(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) __hsc_port_release(cl_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) file->private_data = channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) mutex_unlock(&cl_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) mutex_unlock(&cl_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) static int hsc_release(struct inode *inode __maybe_unused, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) struct hsc_channel *channel = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) struct hsc_client_data *cl_data = channel->cl_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) mutex_lock(&cl_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) file->private_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (test_and_clear_bit(HSC_CH_WLINE, &channel->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) hsi_stop_tx(channel->cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) __hsc_port_release(cl_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) hsc_reset_list(channel, &channel->rx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) hsc_reset_list(channel, &channel->tx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) hsc_reset_list(channel, &channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) clear_bit(HSC_CH_READ, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) clear_bit(HSC_CH_WRITE, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) clear_bit(HSC_CH_OPEN, &channel->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) wake_up(&channel->rx_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) wake_up(&channel->tx_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) mutex_unlock(&cl_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) static const struct file_operations hsc_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) .read = hsc_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) .write = hsc_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) .unlocked_ioctl = hsc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) .open = hsc_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) .release = hsc_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) static void hsc_channel_init(struct hsc_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) init_waitqueue_head(&channel->rx_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) init_waitqueue_head(&channel->tx_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) spin_lock_init(&channel->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) INIT_LIST_HEAD(&channel->free_msgs_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) INIT_LIST_HEAD(&channel->rx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) INIT_LIST_HEAD(&channel->tx_msgs_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) static int hsc_probe(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) const char devname[] = "hsi_char";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) struct hsc_client_data *cl_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) struct hsc_channel *channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) struct hsi_client *cl = to_hsi_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) unsigned int hsc_baseminor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) dev_t hsc_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) cl_data = kzalloc(sizeof(*cl_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) if (!cl_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) hsc_baseminor = HSC_BASEMINOR(hsi_id(cl), hsi_port_id(cl));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (!hsc_major) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) ret = alloc_chrdev_region(&hsc_dev, hsc_baseminor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) HSC_DEVS, devname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) hsc_major = MAJOR(hsc_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) hsc_dev = MKDEV(hsc_major, hsc_baseminor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) ret = register_chrdev_region(hsc_dev, HSC_DEVS, devname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) dev_err(dev, "Device %s allocation failed %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) hsc_major ? "minor" : "major", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) goto out1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) mutex_init(&cl_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) hsi_client_set_drvdata(cl, cl_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) cdev_init(&cl_data->cdev, &hsc_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) cl_data->cdev.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) cl_data->cl = cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) for (i = 0, channel = cl_data->channels; i < HSC_DEVS; i++, channel++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) hsc_channel_init(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) channel->ch = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) channel->cl = cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) channel->cl_data = cl_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) /* 1 hsi client -> N char devices (one for each channel) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) ret = cdev_add(&cl_data->cdev, hsc_dev, HSC_DEVS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) dev_err(dev, "Could not add char device %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) goto out2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) out2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) unregister_chrdev_region(hsc_dev, HSC_DEVS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) out1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) kfree(cl_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) static int hsc_remove(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) struct hsi_client *cl = to_hsi_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) struct hsc_client_data *cl_data = hsi_client_drvdata(cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) dev_t hsc_dev = cl_data->cdev.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) cdev_del(&cl_data->cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) unregister_chrdev_region(hsc_dev, HSC_DEVS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) hsi_client_set_drvdata(cl, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) kfree(cl_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) static struct hsi_client_driver hsc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) .name = "hsi_char",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) .probe = hsc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) .remove = hsc_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) static int __init hsc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) if ((max_data_size < 4) || (max_data_size > 0x10000) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) (max_data_size & (max_data_size - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) pr_err("Invalid max read/write data size\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) ret = hsi_register_client_driver(&hsc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) pr_err("Error while registering HSI/SSI driver %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) pr_info("HSI/SSI char device loaded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) module_init(hsc_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) static void __exit hsc_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) hsi_unregister_client_driver(&hsc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) pr_info("HSI char device removed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) module_exit(hsc_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) MODULE_AUTHOR("Andras Domokos <andras.domokos@nokia.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) MODULE_ALIAS("hsi:hsi_char");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) MODULE_DESCRIPTION("HSI character device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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