25 static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus,
34 static int snd_i2c_bus_free(struct snd_i2c_bus *bus)  in snd_i2c_bus_free()  argument
39 	if (snd_BUG_ON(!bus))  in snd_i2c_bus_free()
41 	while (!list_empty(&bus->devices)) {  in snd_i2c_bus_free()
42 		device = snd_i2c_device(bus->devices.next);  in snd_i2c_bus_free()
45 	if (bus->master)  in snd_i2c_bus_free()
46 		list_del(&bus->buses);  in snd_i2c_bus_free()
48 		while (!list_empty(&bus->buses)) {  in snd_i2c_bus_free()
49 			slave = snd_i2c_slave_bus(bus->buses.next);  in snd_i2c_bus_free()
50 			snd_device_free(bus->card, slave);  in snd_i2c_bus_free()
53 	if (bus->private_free)  in snd_i2c_bus_free()
54 		bus->private_free(bus);  in snd_i2c_bus_free()
55 	kfree(bus);  in snd_i2c_bus_free()
61 	struct snd_i2c_bus *bus = device->device_data;  in snd_i2c_bus_dev_free()  local
62 	return snd_i2c_bus_free(bus);  in snd_i2c_bus_dev_free()
68 	struct snd_i2c_bus *bus;  in snd_i2c_bus_create()  local
75 	bus = kzalloc(sizeof(*bus), GFP_KERNEL);  in snd_i2c_bus_create()
76 	if (bus == NULL)  in snd_i2c_bus_create()
78 	mutex_init(&bus->lock_mutex);  in snd_i2c_bus_create()
79 	INIT_LIST_HEAD(&bus->devices);  in snd_i2c_bus_create()
80 	INIT_LIST_HEAD(&bus->buses);  in snd_i2c_bus_create()
81 	bus->card = card;  in snd_i2c_bus_create()
82 	bus->ops = &snd_i2c_bit_ops;  in snd_i2c_bus_create()
84 		list_add_tail(&bus->buses, &master->buses);  in snd_i2c_bus_create()
85 		bus->master = master;  in snd_i2c_bus_create()
87 	strlcpy(bus->name, name, sizeof(bus->name));  in snd_i2c_bus_create()
88 	err = snd_device_new(card, SNDRV_DEV_BUS, bus, &ops);  in snd_i2c_bus_create()
90 		snd_i2c_bus_free(bus);  in snd_i2c_bus_create()
93 	*ri2c = bus;  in snd_i2c_bus_create()
99 int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,  in snd_i2c_device_create()  argument
105 	if (snd_BUG_ON(!bus))  in snd_i2c_device_create()
112 	list_add_tail(&device->list, &bus->devices);  in snd_i2c_device_create()
113 	device->bus = bus;  in snd_i2c_device_create()
122 	if (device->bus)  in snd_i2c_device_free()
134 	return device->bus->ops->sendbytes(device, bytes, count);  in snd_i2c_sendbytes()
141 	return device->bus->ops->readbytes(device, bytes, count);  in snd_i2c_readbytes()
146 int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)  in snd_i2c_probeaddr()  argument
148 	return bus->ops->probeaddr(bus, addr);  in snd_i2c_probeaddr()
157 static inline void snd_i2c_bit_hw_start(struct snd_i2c_bus *bus)  in snd_i2c_bit_hw_start()  argument
159 	if (bus->hw_ops.bit->start)  in snd_i2c_bit_hw_start()
160 		bus->hw_ops.bit->start(bus);  in snd_i2c_bit_hw_start()
163 static inline void snd_i2c_bit_hw_stop(struct snd_i2c_bus *bus)  in snd_i2c_bit_hw_stop()  argument
165 	if (bus->hw_ops.bit->stop)  in snd_i2c_bit_hw_stop()
166 		bus->hw_ops.bit->stop(bus);  in snd_i2c_bit_hw_stop()
169 static void snd_i2c_bit_direction(struct snd_i2c_bus *bus, int clock, int data)  in snd_i2c_bit_direction()  argument
171 	if (bus->hw_ops.bit->direction)  in snd_i2c_bit_direction()
172 		bus->hw_ops.bit->direction(bus, clock, data);  in snd_i2c_bit_direction()
175 static void snd_i2c_bit_set(struct snd_i2c_bus *bus, int clock, int data)  in snd_i2c_bit_set()  argument
177 	bus->hw_ops.bit->setlines(bus, clock, data);  in snd_i2c_bit_set()
181 static int snd_i2c_bit_clock(struct snd_i2c_bus *bus)
183 	if (bus->hw_ops.bit->getclock)
184 		return bus->hw_ops.bit->getclock(bus);
189 static int snd_i2c_bit_data(struct snd_i2c_bus *bus, int ack)  in snd_i2c_bit_data()  argument
191 	return bus->hw_ops.bit->getdata(bus, ack);  in snd_i2c_bit_data()
194 static void snd_i2c_bit_start(struct snd_i2c_bus *bus)  in snd_i2c_bit_start()  argument
196 	snd_i2c_bit_hw_start(bus);  in snd_i2c_bit_start()
197 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */  in snd_i2c_bit_start()
198 	snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_start()
199 	snd_i2c_bit_set(bus, 1, 0);  in snd_i2c_bit_start()
200 	snd_i2c_bit_set(bus, 0, 0);  in snd_i2c_bit_start()
203 static void snd_i2c_bit_stop(struct snd_i2c_bus *bus)  in snd_i2c_bit_stop()  argument
205 	snd_i2c_bit_set(bus, 0, 0);  in snd_i2c_bit_stop()
206 	snd_i2c_bit_set(bus, 1, 0);  in snd_i2c_bit_stop()
207 	snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_stop()
208 	snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_stop()
211 static void snd_i2c_bit_send(struct snd_i2c_bus *bus, int data)  in snd_i2c_bit_send()  argument
213 	snd_i2c_bit_set(bus, 0, data);  in snd_i2c_bit_send()
214 	snd_i2c_bit_set(bus, 1, data);  in snd_i2c_bit_send()
215 	snd_i2c_bit_set(bus, 0, data);  in snd_i2c_bit_send()
218 static int snd_i2c_bit_ack(struct snd_i2c_bus *bus)  in snd_i2c_bit_ack()  argument
222 	snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_ack()
223 	snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_ack()
224 	snd_i2c_bit_direction(bus, 1, 0);	/* SCL - wr, SDA - rd */  in snd_i2c_bit_ack()
225 	ack = snd_i2c_bit_data(bus, 1);  in snd_i2c_bit_ack()
226 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */  in snd_i2c_bit_ack()
227 	snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_ack()
231 static int snd_i2c_bit_sendbyte(struct snd_i2c_bus *bus, unsigned char data)  in snd_i2c_bit_sendbyte()  argument
236 		snd_i2c_bit_send(bus, !!(data & (1 << i)));  in snd_i2c_bit_sendbyte()
237 	err = snd_i2c_bit_ack(bus);  in snd_i2c_bit_sendbyte()
243 static int snd_i2c_bit_readbyte(struct snd_i2c_bus *bus, int last)  in snd_i2c_bit_readbyte()  argument
248 	snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_readbyte()
249 	snd_i2c_bit_direction(bus, 1, 0);	/* SCL - wr, SDA - rd */  in snd_i2c_bit_readbyte()
251 		snd_i2c_bit_set(bus, 1, 1);  in snd_i2c_bit_readbyte()
252 		if (snd_i2c_bit_data(bus, 0))  in snd_i2c_bit_readbyte()
254 		snd_i2c_bit_set(bus, 0, 1);  in snd_i2c_bit_readbyte()
256 	snd_i2c_bit_direction(bus, 1, 1);	/* SCL - wr, SDA - wr */  in snd_i2c_bit_readbyte()
257 	snd_i2c_bit_send(bus, !!last);  in snd_i2c_bit_readbyte()
264 	struct snd_i2c_bus *bus = device->bus;  in snd_i2c_bit_sendbytes()  local
269 	snd_i2c_bit_start(bus);  in snd_i2c_bit_sendbytes()
270 	err = snd_i2c_bit_sendbyte(bus, device->addr << 1);  in snd_i2c_bit_sendbytes()
272 		snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_sendbytes()
276 		err = snd_i2c_bit_sendbyte(bus, *bytes++);  in snd_i2c_bit_sendbytes()
278 			snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_sendbytes()
283 	snd_i2c_bit_stop(bus);  in snd_i2c_bit_sendbytes()
290 	struct snd_i2c_bus *bus = device->bus;  in snd_i2c_bit_readbytes()  local
295 	snd_i2c_bit_start(bus);  in snd_i2c_bit_readbytes()
296 	err = snd_i2c_bit_sendbyte(bus, (device->addr << 1) | 1);  in snd_i2c_bit_readbytes()
298 		snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_readbytes()
302 		err = snd_i2c_bit_readbyte(bus, count == 0);  in snd_i2c_bit_readbytes()
304 			snd_i2c_bit_hw_stop(bus);  in snd_i2c_bit_readbytes()
310 	snd_i2c_bit_stop(bus);  in snd_i2c_bit_readbytes()
314 static int snd_i2c_bit_probeaddr(struct snd_i2c_bus *bus, unsigned short addr)  in snd_i2c_bit_probeaddr()  argument
322 	snd_i2c_bit_start(bus);  in snd_i2c_bit_probeaddr()
323 	err = snd_i2c_bit_sendbyte(bus, addr << 1);  in snd_i2c_bit_probeaddr()
324 	snd_i2c_bit_stop(bus);  in snd_i2c_bit_probeaddr()