subdev/i2c/bus.c

24 #include "bus.h"
35 	struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
36 	return nvkm_i2c_bus_acquire(bus);
42 	struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
43 	return nvkm_i2c_bus_release(bus);
49 	struct nvkm_i2c_bus *bus = data;
50 	bus->func->drive_scl(bus, state);
56 	struct nvkm_i2c_bus *bus = data;
57 	bus->func->drive_sda(bus, state);
63 	struct nvkm_i2c_bus *bus = data;
64 	return bus->func->sense_scl(bus);
70 	struct nvkm_i2c_bus *bus = data;
71 	return bus->func->sense_sda(bus);
75  * !i2c-algo-bit (off-chip i2c bus / hw i2c / internal bit-banging algo)
80 	struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
83 	ret = nvkm_i2c_bus_acquire(bus);
87 	ret = bus->func->xfer(bus, msgs, num);
88 	nvkm_i2c_bus_release(bus);
108 nvkm_i2c_bus_init(struct nvkm_i2c_bus *bus)
110 	BUS_TRACE(bus, "init");
111 	if (bus->func->init)
112 		bus->func->init(bus);
114 	mutex_lock(&bus->mutex);
115 	bus->enabled = true;
116 	mutex_unlock(&bus->mutex);
120 nvkm_i2c_bus_fini(struct nvkm_i2c_bus *bus)
122 	BUS_TRACE(bus, "fini");
123 	mutex_lock(&bus->mutex);
124 	bus->enabled = false;
125 	mutex_unlock(&bus->mutex);
129 nvkm_i2c_bus_release(struct nvkm_i2c_bus *bus)
131 	struct nvkm_i2c_pad *pad = bus->pad;
132 	BUS_TRACE(bus, "release");
134 	mutex_unlock(&bus->mutex);
138 nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *bus)
140 	struct nvkm_i2c_pad *pad = bus->pad;
143 	BUS_TRACE(bus, "acquire");
144 	mutex_lock(&bus->mutex);
146 	if (bus->enabled)
152 		mutex_unlock(&bus->mutex);
157 nvkm_i2c_bus_probe(struct nvkm_i2c_bus *bus, const char *what,
164 	BUS_DBG(bus, "probing %ss", what);
168 		if ((bus->i2c.algo == &i2c_bit_algo) && (info[i].udelay != 0)) {
169 			struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
170 			BUS_DBG(bus, "%dms delay instead of %dms",
176 		if (nvkm_probe_i2c(&bus->i2c, info[i].dev.addr) &&
177 		    (!match || match(bus, &info[i].dev, data))) {
178 			BUS_DBG(bus, "detected %s: %s",
184 			struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
189 	BUS_DBG(bus, "no devices found.");
196 	struct nvkm_i2c_bus *bus = *pbus;
197 	if (bus && !WARN_ON(!bus->func)) {
198 		BUS_TRACE(bus, "dtor");
199 		list_del(&bus->head);
200 		i2c_del_adapter(&bus->i2c);
201 		kfree(bus->i2c.algo_data);
210 		  struct nvkm_i2c_bus *bus)
221 	bus->func = func;
222 	bus->pad = pad;
223 	bus->id = id;
224 	mutex_init(&bus->mutex);
225 	list_add_tail(&bus->head, &pad->i2c->bus);
226 	BUS_TRACE(bus, "ctor");
228 	snprintf(bus->i2c.name, sizeof(bus->i2c.name), "nvkm-%s-bus-%04x",
230 	bus->i2c.owner = THIS_MODULE;
231 	bus->i2c.dev.parent = device->dev;
233 	if ( bus->func->drive_scl &&
239 		bit->data = bus;
246 		bus->i2c.algo_data = bit;
247 		ret = i2c_bit_add_bus(&bus->i2c);
249 		bus->i2c.algo = &nvkm_i2c_bus_algo;
250 		ret = i2c_add_adapter(&bus->i2c);