39 static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus,
48 static int snd_i2c_bus_free(struct snd_i2c_bus *bus)  in snd_i2c_bus_free()  argument
53 	if (snd_BUG_ON(!bus))  in snd_i2c_bus_free()
55 	while (!list_empty(&bus->devices)) {  in snd_i2c_bus_free()
56 		device = snd_i2c_device(bus->devices.next);  in snd_i2c_bus_free()
59 	if (bus->master)  in snd_i2c_bus_free()
60 		list_del(&bus->buses);  in snd_i2c_bus_free()
62 		while (!list_empty(&bus->buses)) {  in snd_i2c_bus_free()
63 			slave = snd_i2c_slave_bus(bus->buses.next);  in snd_i2c_bus_free()
64 			snd_device_free(bus->card, slave);  in snd_i2c_bus_free()
67 	if (bus->private_free)  in snd_i2c_bus_free()
68 		bus->private_free(bus);  in snd_i2c_bus_free()
69 	kfree(bus);  in snd_i2c_bus_free()
75 	struct snd_i2c_bus *bus = device->device_data;  in snd_i2c_bus_dev_free()  local
76 	return snd_i2c_bus_free(bus);  in snd_i2c_bus_dev_free()
82 	struct snd_i2c_bus *bus;  in snd_i2c_bus_create()  local
89 	bus = kzalloc(sizeof(*bus), GFP_KERNEL);  in snd_i2c_bus_create()
90 	if (bus == NULL)  in snd_i2c_bus_create()
92 	mutex_init(&bus->lock_mutex);  in snd_i2c_bus_create()
93 	INIT_LIST_HEAD(&bus->devices);  in snd_i2c_bus_create()
94 	INIT_LIST_HEAD(&bus->buses);  in snd_i2c_bus_create()
95 	bus->card = card;  in snd_i2c_bus_create()
96 	bus->ops = &snd_i2c_bit_ops;  in snd_i2c_bus_create()
98 		list_add_tail(&bus->buses, &master->buses);  in snd_i2c_bus_create()
99 		bus->master = master;  in snd_i2c_bus_create()
101 	strlcpy(bus->name, name, sizeof(bus->name));  in snd_i2c_bus_create()
102 	err = snd_device_new(card, SNDRV_DEV_BUS, bus, &ops);  in snd_i2c_bus_create()
104 		snd_i2c_bus_free(bus);  in snd_i2c_bus_create()
107 	*ri2c = bus;  in snd_i2c_bus_create()
113 int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,  in snd_i2c_device_create()  argument
119 	if (snd_BUG_ON(!bus))  in snd_i2c_device_create()
126 	list_add_tail(&device->list, &bus->devices);  in snd_i2c_device_create()
127 	device->bus = bus;  in snd_i2c_device_create()
136 	if (device->bus)  in snd_i2c_device_free()
148 	return device->bus->ops->sendbytes(device, bytes, count);  in snd_i2c_sendbytes()
155 	return device->bus->ops->readbytes(device, bytes, count);  in snd_i2c_readbytes()
160 int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)  in snd_i2c_probeaddr()  argument
162 	return bus->ops->probeaddr(bus, addr);  in snd_i2c_probeaddr()
171 static inline void snd_i2c_bit_hw_start(struct snd_i2c_bus *bus)  in snd_i2c_bit_hw_start()  argument
173 	if (bus->hw_ops.bit->start)  in snd_i2c_bit_hw_start()
174 		bus->hw_ops.bit->start(bus);  in snd_i2c_bit_hw_start()
177 static inline void snd_i2c_bit_hw_stop(struct snd_i2c_bus *bus)  in snd_i2c_bit_hw_stop()  argument
179 	if (bus->hw_ops.bit->stop)  in snd_i2c_bit_hw_stop()
180 		bus->hw_ops.bit->stop(bus);  in snd_i2c_bit_hw_stop()
183 static void snd_i2c_bit_direction(struct snd_i2c_bus *bus, int clock, int data)  in snd_i2c_bit_direction()  argument
185 	if (bus->hw_ops.bit->direction)  in snd_i2c_bit_direction()
186 		bus->hw_ops.bit->direction(bus, clock, data);  in snd_i2c_bit_direction()
189 static void snd_i2c_bit_set(struct snd_i2c_bus *bus, int clock, int data)  in snd_i2c_bit_set()  argument
191 	bus->hw_ops.bit->setlines(bus, clock, data);  in snd_i2c_bit_set()
195 static int snd_i2c_bit_clock(struct snd_i2c_bus *bus)
197 	if (bus->hw_ops.bit->getclock)
198 		return bus->hw_ops.bit->getclock(bus);
203 static int snd_i2c_bit_data(struct snd_i2c_bus *bus, int ack)  in snd_i2c_bit_data()  argument
205 	return bus->hw_ops.bit->getdata(bus, ack);  in snd_i2c_bit_data()
208 static void snd_i2c_bit_start(struct snd_i2c_bus *bus)  in snd_i2c_bit_start()  argument
210 	snd_i2c_bit_hw_start(bus);  in snd_i2c_bit_start()
211 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */  in snd_i2c_bit_start()
212 	snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_start()
213 	snd_i2c_bit_set(bus, 1, 0);  in snd_i2c_bit_start()
214 	snd_i2c_bit_set(bus, 0, 0);  in snd_i2c_bit_start()
217 static void snd_i2c_bit_stop(struct snd_i2c_bus *bus)  in snd_i2c_bit_stop()  argument
219 	snd_i2c_bit_set(bus, 0, 0);  in snd_i2c_bit_stop()
220 	snd_i2c_bit_set(bus, 1, 0);  in snd_i2c_bit_stop()
221 	snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_stop()
222 	snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_stop()
225 static void snd_i2c_bit_send(struct snd_i2c_bus *bus, int data)  in snd_i2c_bit_send()  argument
227 	snd_i2c_bit_set(bus, 0, data);  in snd_i2c_bit_send()
228 	snd_i2c_bit_set(bus, 1, data);  in snd_i2c_bit_send()
229 	snd_i2c_bit_set(bus, 0, data);  in snd_i2c_bit_send()
232 static int snd_i2c_bit_ack(struct snd_i2c_bus *bus)  in snd_i2c_bit_ack()  argument
236 	snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_ack()
237 	snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_ack()
238 	snd_i2c_bit_direction(bus, 1, 0);	/* SCL - wr, SDA - rd */  in snd_i2c_bit_ack()
239 	ack = snd_i2c_bit_data(bus, 1);  in snd_i2c_bit_ack()
240 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */  in snd_i2c_bit_ack()
241 	snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_ack()
245 static int snd_i2c_bit_sendbyte(struct snd_i2c_bus *bus, unsigned char data)  in snd_i2c_bit_sendbyte()  argument
250 		snd_i2c_bit_send(bus, !!(data & (1 << i)));  in snd_i2c_bit_sendbyte()
251 	err = snd_i2c_bit_ack(bus);  in snd_i2c_bit_sendbyte()
257 static int snd_i2c_bit_readbyte(struct snd_i2c_bus *bus, int last)  in snd_i2c_bit_readbyte()  argument
262 	snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_readbyte()
263 	snd_i2c_bit_direction(bus, 1, 0);	/* SCL - wr, SDA - rd */  in snd_i2c_bit_readbyte()
265 		snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_readbyte()
266 		if (snd_i2c_bit_data(bus, 0))  in snd_i2c_bit_readbyte()
268 		snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_readbyte()
270 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */  in snd_i2c_bit_readbyte()
271 	snd_i2c_bit_send(bus, !!last);  in snd_i2c_bit_readbyte()
278 	struct snd_i2c_bus *bus = device->bus;  in snd_i2c_bit_sendbytes()  local
283 	snd_i2c_bit_start(bus);  in snd_i2c_bit_sendbytes()
284 	err = snd_i2c_bit_sendbyte(bus, device->addr << 1);  in snd_i2c_bit_sendbytes()
286 		snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_sendbytes()
290 		err = snd_i2c_bit_sendbyte(bus, *bytes++);  in snd_i2c_bit_sendbytes()
292 			snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_sendbytes()
297 	snd_i2c_bit_stop(bus);  in snd_i2c_bit_sendbytes()
304 	struct snd_i2c_bus *bus = device->bus;  in snd_i2c_bit_readbytes()  local
309 	snd_i2c_bit_start(bus);  in snd_i2c_bit_readbytes()
310 	err = snd_i2c_bit_sendbyte(bus, (device->addr << 1) | 1);  in snd_i2c_bit_readbytes()
312 		snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_readbytes()
316 		err = snd_i2c_bit_readbyte(bus, count == 0);  in snd_i2c_bit_readbytes()
318 			snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_readbytes()
324 	snd_i2c_bit_stop(bus);  in snd_i2c_bit_readbytes()
328 static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)  in snd_i2c_bit_probeaddr()  argument
336 	snd_i2c_bit_start(bus);  in snd_i2c_bit_probeaddr()
337 	err = snd_i2c_bit_sendbyte(bus, addr << 1);  in snd_i2c_bit_probeaddr()
338 	snd_i2c_bit_stop(bus);  in snd_i2c_bit_probeaddr()