^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * cdev.c - Character device component for Mostcore
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/cdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/kfifo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/most.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define CHRDEV_REGION_SIZE 50
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct cdev_component {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) dev_t devno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct ida minor_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned int major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct class *class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct most_component cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) } comp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct comp_channel {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) wait_queue_head_t wq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) spinlock_t unlink; /* synchronization lock to unlink channels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct cdev cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct mutex io_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct most_interface *iface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct most_channel_config *cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) unsigned int channel_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) dev_t devno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) size_t mbo_offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) DECLARE_KFIFO_PTR(fifo, typeof(struct mbo *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int access_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define to_channel(d) container_of(d, struct comp_channel, cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static struct list_head channel_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static spinlock_t ch_list_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static inline bool ch_has_mbo(struct comp_channel *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return channel_has_mbo(c->iface, c->channel_id, &comp.cc) > 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static inline struct mbo *ch_get_mbo(struct comp_channel *c, struct mbo **mbo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (!kfifo_peek(&c->fifo, mbo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *mbo = most_get_mbo(c->iface, c->channel_id, &comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (*mbo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) kfifo_in(&c->fifo, mbo, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return *mbo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static struct comp_channel *get_channel(struct most_interface *iface, int id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct comp_channel *c, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) spin_lock_irqsave(&ch_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) list_for_each_entry_safe(c, tmp, &channel_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if ((c->iface == iface) && (c->channel_id == id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) spin_unlock_irqrestore(&ch_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) spin_unlock_irqrestore(&ch_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static void stop_channel(struct comp_channel *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct mbo *mbo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) while (kfifo_out((struct kfifo *)&c->fifo, &mbo, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) most_put_mbo(mbo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) most_stop_channel(c->iface, c->channel_id, &comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static void destroy_cdev(struct comp_channel *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) device_destroy(comp.class, c->devno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) cdev_del(&c->cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) spin_lock_irqsave(&ch_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) list_del(&c->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) spin_unlock_irqrestore(&ch_list_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static void destroy_channel(struct comp_channel *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ida_simple_remove(&comp.minor_id, MINOR(c->devno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) kfifo_free(&c->fifo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) kfree(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^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) * comp_open - implements the syscall to open the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * @inode: inode pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * @filp: file pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * This stores the channel pointer in the private data field of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * the file structure and activates the channel within the core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static int comp_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct comp_channel *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) c = to_channel(inode->i_cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) filp->private_data = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (((c->cfg->direction == MOST_CH_RX) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ((filp->f_flags & O_ACCMODE) != O_RDONLY)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ((c->cfg->direction == MOST_CH_TX) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ((filp->f_flags & O_ACCMODE) != O_WRONLY))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (!c->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (c->access_ref) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) c->mbo_offs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ret = most_start_channel(c->iface, c->channel_id, &comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) c->access_ref = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^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) * comp_close - implements the syscall to close the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * @inode: inode pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * @filp: file pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * This stops the channel within the core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int comp_close(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct comp_channel *c = to_channel(inode->i_cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) spin_lock(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) c->access_ref = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) spin_unlock(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (c->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) stop_channel(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) destroy_channel(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * comp_write - implements the syscall to write to the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * @filp: file pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * @buf: pointer to user buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * @count: number of bytes to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * @offset: offset from where to start writing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static ssize_t comp_write(struct file *filp, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) size_t count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) size_t to_copy, left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct mbo *mbo = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct comp_channel *c = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) while (c->dev && !ch_get_mbo(c, &mbo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if ((filp->f_flags & O_NONBLOCK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (wait_event_interruptible(c->wq, ch_has_mbo(c) || !c->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (unlikely(!c->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) to_copy = min(count, c->cfg->buffer_size - c->mbo_offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) left = copy_from_user(mbo->virt_address + c->mbo_offs, buf, to_copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (left == to_copy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) c->mbo_offs += to_copy - left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (c->mbo_offs >= c->cfg->buffer_size ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) c->cfg->data_type == MOST_CH_CONTROL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) c->cfg->data_type == MOST_CH_ASYNC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) kfifo_skip(&c->fifo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) mbo->buffer_length = c->mbo_offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) c->mbo_offs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) most_submit_mbo(mbo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ret = to_copy - left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * comp_read - implements the syscall to read from the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * @filp: file pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * @buf: pointer to user buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * @count: number of bytes to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * @offset: offset from where to start reading
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) comp_read(struct file *filp, char __user *buf, size_t count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) size_t to_copy, not_copied, copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) struct mbo *mbo = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct comp_channel *c = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) while (c->dev && !kfifo_peek(&c->fifo, &mbo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (filp->f_flags & O_NONBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) if (wait_event_interruptible(c->wq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) (!kfifo_is_empty(&c->fifo) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) (!c->dev))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) /* make sure we don't submit to gone devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (unlikely(!c->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) to_copy = min_t(size_t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) mbo->processed_length - c->mbo_offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) not_copied = copy_to_user(buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) mbo->virt_address + c->mbo_offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) to_copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) copied = to_copy - not_copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) c->mbo_offs += copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (c->mbo_offs >= mbo->processed_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) kfifo_skip(&c->fifo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) most_put_mbo(mbo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) c->mbo_offs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static __poll_t comp_poll(struct file *filp, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct comp_channel *c = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) __poll_t mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) poll_wait(filp, &c->wq, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (c->cfg->direction == MOST_CH_RX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (!c->dev || !kfifo_is_empty(&c->fifo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) mask |= EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (!c->dev || !kfifo_is_empty(&c->fifo) || ch_has_mbo(c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) mask |= EPOLLOUT | EPOLLWRNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return mask;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * Initialization of struct file_operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static const struct file_operations channel_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) .read = comp_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) .write = comp_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) .open = comp_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) .release = comp_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) .poll = comp_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * comp_disconnect_channel - disconnect a channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * @iface: pointer to interface instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * @channel_id: channel index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * This frees allocated memory and removes the cdev that represents this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * channel in user space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static int comp_disconnect_channel(struct most_interface *iface, int channel_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct comp_channel *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) c = get_channel(iface, channel_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (!c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) mutex_lock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) spin_lock(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) c->dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) spin_unlock(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) destroy_cdev(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (c->access_ref) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) stop_channel(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) wake_up_interruptible(&c->wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) mutex_unlock(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) destroy_channel(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * comp_rx_completion - completion handler for rx channels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * @mbo: pointer to buffer object that has completed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * This searches for the channel linked to this MBO and stores it in the local
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * fifo buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static int comp_rx_completion(struct mbo *mbo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct comp_channel *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (!mbo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) c = get_channel(mbo->ifp, mbo->hdm_channel_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (!c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) spin_lock(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (!c->access_ref || !c->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) spin_unlock(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) kfifo_in(&c->fifo, &mbo, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) spin_unlock(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) #ifdef DEBUG_MESG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (kfifo_is_full(&c->fifo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) dev_warn(c->dev, "Fifo is full\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) wake_up_interruptible(&c->wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return 0;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * comp_tx_completion - completion handler for tx channels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * @iface: pointer to interface instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * @channel_id: channel index/ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * This wakes sleeping processes in the wait-queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) static int comp_tx_completion(struct most_interface *iface, int channel_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) struct comp_channel *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) c = get_channel(iface, channel_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (!c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if ((channel_id < 0) || (channel_id >= iface->num_channels)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) dev_warn(c->dev, "Channel ID out of range\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) wake_up_interruptible(&c->wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return 0;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) * comp_probe - probe function of the driver module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * @iface: pointer to interface instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) * @channel_id: channel index/ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * @cfg: pointer to actual channel configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * @name: name of the device to be created
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * This allocates achannel object and creates the device node in /dev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * Returns 0 on success or error code otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) static int comp_probe(struct most_interface *iface, int channel_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct most_channel_config *cfg, char *name, char *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) struct comp_channel *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) unsigned long cl_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) int current_minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if (!cfg || !name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) c = get_channel(iface, channel_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) current_minor = ida_simple_get(&comp.minor_id, 0, 0, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (current_minor < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return current_minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) c = kzalloc(sizeof(*c), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (!c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) goto err_remove_ida;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) c->devno = MKDEV(comp.major, current_minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) cdev_init(&c->cdev, &channel_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) c->cdev.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) retval = cdev_add(&c->cdev, c->devno, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) goto err_free_c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) c->iface = iface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) c->cfg = cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) c->channel_id = channel_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) c->access_ref = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) spin_lock_init(&c->unlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) INIT_KFIFO(c->fifo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) retval = kfifo_alloc(&c->fifo, cfg->num_buffers, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) goto err_del_cdev_and_free_channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) init_waitqueue_head(&c->wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) mutex_init(&c->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) spin_lock_irqsave(&ch_list_lock, cl_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) list_add_tail(&c->list, &channel_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) spin_unlock_irqrestore(&ch_list_lock, cl_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) c->dev = device_create(comp.class, NULL, c->devno, NULL, "%s", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (IS_ERR(c->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) retval = PTR_ERR(c->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) goto err_free_kfifo_and_del_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) kobject_uevent(&c->dev->kobj, KOBJ_ADD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) err_free_kfifo_and_del_list:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) kfifo_free(&c->fifo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) list_del(&c->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) err_del_cdev_and_free_channel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) cdev_del(&c->cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) err_free_c:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) kfree(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) err_remove_ida:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) ida_simple_remove(&comp.minor_id, current_minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) static struct cdev_component comp = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) .cc = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) .mod = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) .name = "cdev",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) .probe_channel = comp_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) .disconnect_channel = comp_disconnect_channel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) .rx_completion = comp_rx_completion,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) .tx_completion = comp_tx_completion,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) static int __init mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) comp.class = class_create(THIS_MODULE, "most_cdev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) if (IS_ERR(comp.class))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return PTR_ERR(comp.class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) INIT_LIST_HEAD(&channel_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) spin_lock_init(&ch_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) ida_init(&comp.minor_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) err = alloc_chrdev_region(&comp.devno, 0, CHRDEV_REGION_SIZE, "cdev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) goto dest_ida;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) comp.major = MAJOR(comp.devno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) err = most_register_component(&comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) goto free_cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) err = most_register_configfs_subsys(&comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) goto deregister_comp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) deregister_comp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) most_deregister_component(&comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) free_cdev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) dest_ida:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) ida_destroy(&comp.minor_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) class_destroy(comp.class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) static void __exit mod_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) struct comp_channel *c, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) most_deregister_configfs_subsys(&comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) most_deregister_component(&comp.cc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) list_for_each_entry_safe(c, tmp, &channel_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) destroy_cdev(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) destroy_channel(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) ida_destroy(&comp.minor_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) class_destroy(comp.class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) module_init(mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) module_exit(mod_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) MODULE_DESCRIPTION("character device component for mostcore");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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