Orange Pi5 kernel

^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)  * dice_hwdep.c - a part of driver for DICE based devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "dice.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 			    long count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 	struct snd_dice *dice = hwdep->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	DEFINE_WAIT(wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	union snd_firewire_event event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	spin_lock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	while (!dice->dev_lock_changed && dice->notification_bits == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		prepare_to_wait(&dice->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 		spin_unlock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 		schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 		finish_wait(&dice->hwdep_wait, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 		if (signal_pending(current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 			return -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 		spin_lock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	memset(&event, 0, sizeof(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	if (dice->dev_lock_changed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		event.lock_status.status = dice->dev_lock_count > 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		dice->dev_lock_changed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		count = min_t(long, count, sizeof(event.lock_status));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		event.dice_notification.type =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 					SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		event.dice_notification.notification = dice->notification_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		dice->notification_bits = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		count = min_t(long, count, sizeof(event.dice_notification));
^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) 	spin_unlock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (copy_to_user(buf, &event, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			       poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	struct snd_dice *dice = hwdep->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	__poll_t events;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	poll_wait(file, &dice->hwdep_wait, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	spin_lock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	if (dice->dev_lock_changed || dice->notification_bits != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		events = EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		events = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	spin_unlock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	return events;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static int hwdep_get_info(struct snd_dice *dice, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct fw_device *dev = fw_parent_device(dice->unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct snd_firewire_get_info info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	memset(&info, 0, sizeof(info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	info.type = SNDRV_FIREWIRE_TYPE_DICE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	info.card = dev->card->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	strlcpy(info.device_name, dev_name(&dev->device),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		sizeof(info.device_name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	if (copy_to_user(arg, &info, sizeof(info)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	return 0;
^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) static int hwdep_lock(struct snd_dice *dice)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	spin_lock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (dice->dev_lock_count == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		dice->dev_lock_count = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	spin_unlock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	return err;
^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) static int hwdep_unlock(struct snd_dice *dice)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	spin_lock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (dice->dev_lock_count == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		dice->dev_lock_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		err = -EBADFD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	spin_unlock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct snd_dice *dice = hwdep->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	spin_lock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (dice->dev_lock_count == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		dice->dev_lock_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	spin_unlock_irq(&dice->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		       unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct snd_dice *dice = hwdep->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return hwdep_get_info(dice, (void __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	case SNDRV_FIREWIRE_IOCTL_LOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		return hwdep_lock(dice);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		return hwdep_unlock(dice);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			      unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return hwdep_ioctl(hwdep, file, cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			   (unsigned long)compat_ptr(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) #define hwdep_compat_ioctl NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int snd_dice_create_hwdep(struct snd_dice *dice)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	static const struct snd_hwdep_ops ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		.read         = hwdep_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		.release      = hwdep_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		.poll         = hwdep_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		.ioctl        = hwdep_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		.ioctl_compat = hwdep_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct snd_hwdep *hwdep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	err = snd_hwdep_new(dice->card, "DICE", 0, &hwdep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	strcpy(hwdep->name, "DICE");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	hwdep->iface = SNDRV_HWDEP_IFACE_FW_DICE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	hwdep->ops = ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	hwdep->private_data = dice;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	hwdep->exclusive = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }