Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *   Generic i2c interface for ALSA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *   (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *   Modified for the ALSA driver by Jaroslav Kysela <perex@perex.cz>
^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 <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <sound/core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <sound/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) MODULE_DESCRIPTION("Generic i2c interface for ALSA");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static int snd_i2c_bit_sendbytes(struct snd_i2c_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 				 unsigned char *bytes, int count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static int snd_i2c_bit_readbytes(struct snd_i2c_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 				 unsigned char *bytes, int count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 				 unsigned short addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static const struct snd_i2c_ops snd_i2c_bit_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	.sendbytes = snd_i2c_bit_sendbytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	.readbytes = snd_i2c_bit_readbytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	.probeaddr = snd_i2c_bit_probeaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static int snd_i2c_bus_free(struct snd_i2c_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct snd_i2c_bus *slave;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct snd_i2c_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (snd_BUG_ON(!bus))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	while (!list_empty(&bus->devices)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		device = snd_i2c_device(bus->devices.next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		snd_i2c_device_free(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	if (bus->master)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		list_del(&bus->buses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		while (!list_empty(&bus->buses)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			slave = snd_i2c_slave_bus(bus->buses.next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			snd_device_free(bus->card, slave);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	if (bus->private_free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		bus->private_free(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	kfree(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	return 0;
^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) static int snd_i2c_bus_dev_free(struct snd_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	struct snd_i2c_bus *bus = device->device_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	return snd_i2c_bus_free(bus);
^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) int snd_i2c_bus_create(struct snd_card *card, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		       struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	struct snd_i2c_bus *bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	static const struct snd_device_ops ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		.dev_free =	snd_i2c_bus_dev_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	*ri2c = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (bus == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	mutex_init(&bus->lock_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	INIT_LIST_HEAD(&bus->devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	INIT_LIST_HEAD(&bus->buses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	bus->card = card;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	bus->ops = &snd_i2c_bit_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (master) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		list_add_tail(&bus->buses, &master->buses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		bus->master = master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	strlcpy(bus->name, name, sizeof(bus->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	err = snd_device_new(card, SNDRV_DEV_BUS, bus, &ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		snd_i2c_bus_free(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	*ri2c = bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) EXPORT_SYMBOL(snd_i2c_bus_create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			  unsigned char addr, struct snd_i2c_device **rdevice)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct snd_i2c_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	*rdevice = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (snd_BUG_ON(!bus))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	device = kzalloc(sizeof(*device), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if (device == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	device->addr = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	strlcpy(device->name, name, sizeof(device->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	list_add_tail(&device->list, &bus->devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	device->bus = bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	*rdevice = device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) EXPORT_SYMBOL(snd_i2c_device_create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int snd_i2c_device_free(struct snd_i2c_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (device->bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		list_del(&device->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (device->private_free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		device->private_free(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	kfree(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) EXPORT_SYMBOL(snd_i2c_device_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return device->bus->ops->sendbytes(device, bytes, count);
^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) EXPORT_SYMBOL(snd_i2c_sendbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	return device->bus->ops->readbytes(device, bytes, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) EXPORT_SYMBOL(snd_i2c_readbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return bus->ops->probeaddr(bus, addr);
^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) EXPORT_SYMBOL(snd_i2c_probeaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  *  bit-operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static inline void snd_i2c_bit_hw_start(struct snd_i2c_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	if (bus->hw_ops.bit->start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		bus->hw_ops.bit->start(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static inline void snd_i2c_bit_hw_stop(struct snd_i2c_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (bus->hw_ops.bit->stop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		bus->hw_ops.bit->stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static void snd_i2c_bit_direction(struct snd_i2c_bus *bus, int clock, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (bus->hw_ops.bit->direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		bus->hw_ops.bit->direction(bus, clock, data);
^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) static void snd_i2c_bit_set(struct snd_i2c_bus *bus, int clock, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	bus->hw_ops.bit->setlines(bus, clock, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) #if 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static int snd_i2c_bit_clock(struct snd_i2c_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (bus->hw_ops.bit->getclock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		return bus->hw_ops.bit->getclock(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static int snd_i2c_bit_data(struct snd_i2c_bus *bus, int ack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	return bus->hw_ops.bit->getdata(bus, ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static void snd_i2c_bit_start(struct snd_i2c_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	snd_i2c_bit_hw_start(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	snd_i2c_bit_set(bus, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	snd_i2c_bit_set(bus, 1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	snd_i2c_bit_set(bus, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static void snd_i2c_bit_stop(struct snd_i2c_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	snd_i2c_bit_set(bus, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	snd_i2c_bit_set(bus, 1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	snd_i2c_bit_set(bus, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	snd_i2c_bit_hw_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static void snd_i2c_bit_send(struct snd_i2c_bus *bus, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	snd_i2c_bit_set(bus, 0, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	snd_i2c_bit_set(bus, 1, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	snd_i2c_bit_set(bus, 0, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static int snd_i2c_bit_ack(struct snd_i2c_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	int ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	snd_i2c_bit_set(bus, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	snd_i2c_bit_set(bus, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	snd_i2c_bit_direction(bus, 1, 0);	/* SCL - wr, SDA - rd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	ack = snd_i2c_bit_data(bus, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	snd_i2c_bit_set(bus, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	return ack ? -EIO : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static int snd_i2c_bit_sendbyte(struct snd_i2c_bus *bus, unsigned char data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	for (i = 7; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		snd_i2c_bit_send(bus, !!(data & (1 << i)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	err = snd_i2c_bit_ack(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static int snd_i2c_bit_readbyte(struct snd_i2c_bus *bus, int last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	unsigned char data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	snd_i2c_bit_set(bus, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	snd_i2c_bit_direction(bus, 1, 0);	/* SCL - wr, SDA - rd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	for (i = 7; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		snd_i2c_bit_set(bus, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		if (snd_i2c_bit_data(bus, 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			data |= (1 << i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		snd_i2c_bit_set(bus, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	snd_i2c_bit_send(bus, !!last);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	return data;
^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) static int snd_i2c_bit_sendbytes(struct snd_i2c_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 				 unsigned char *bytes, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct snd_i2c_bus *bus = device->bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	int err, res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (device->flags & SND_I2C_DEVICE_ADDRTEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		return -EIO;		/* not yet implemented */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	snd_i2c_bit_start(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	err = snd_i2c_bit_sendbyte(bus, device->addr << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		snd_i2c_bit_hw_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	while (count-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		err = snd_i2c_bit_sendbyte(bus, *bytes++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			snd_i2c_bit_hw_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		res++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	snd_i2c_bit_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static int snd_i2c_bit_readbytes(struct snd_i2c_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 				 unsigned char *bytes, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	struct snd_i2c_bus *bus = device->bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	int err, res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (device->flags & SND_I2C_DEVICE_ADDRTEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return -EIO;		/* not yet implemented */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	snd_i2c_bit_start(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	err = snd_i2c_bit_sendbyte(bus, (device->addr << 1) | 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		snd_i2c_bit_hw_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	while (count-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		err = snd_i2c_bit_readbyte(bus, count == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			snd_i2c_bit_hw_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		*bytes++ = (unsigned char)err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		res++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	snd_i2c_bit_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (addr & 0x8000)	/* 10-bit address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		return -EIO;	/* not yet implemented */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	if (addr & 0x7f80)	/* invalid address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	snd_i2c_bit_start(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	err = snd_i2c_bit_sendbyte(bus, addr << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	snd_i2c_bit_stop(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }