2 * Copyright 2015 Red Hat Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
22 * Authors: Ben Skeggs <bskeggs@redhat.com>
27 #include <core/option.h>
29 /*******************************************************************************
31 ******************************************************************************/
33 nvkm_i2c_bus_pre_xfer(struct i2c_adapter *adap)
35 struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
36 return nvkm_i2c_bus_acquire(bus);
40 nvkm_i2c_bus_post_xfer(struct i2c_adapter *adap)
42 struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
43 return nvkm_i2c_bus_release(bus);
47 nvkm_i2c_bus_setscl(void *data, int state)
49 struct nvkm_i2c_bus *bus = data;
50 bus->func->drive_scl(bus, state);
54 nvkm_i2c_bus_setsda(void *data, int state)
56 struct nvkm_i2c_bus *bus = data;
57 bus->func->drive_sda(bus, state);
61 nvkm_i2c_bus_getscl(void *data)
63 struct nvkm_i2c_bus *bus = data;
64 return bus->func->sense_scl(bus);
68 nvkm_i2c_bus_getsda(void *data)
70 struct nvkm_i2c_bus *bus = data;
71 return bus->func->sense_sda(bus);
74 /*******************************************************************************
75 * !i2c-algo-bit (off-chip i2c bus / hw i2c / internal bit-banging algo)
76 ******************************************************************************/
78 nvkm_i2c_bus_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
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);
93 nvkm_i2c_bus_func(struct i2c_adapter *adap)
95 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
98 static const struct i2c_algorithm
100 .master_xfer = nvkm_i2c_bus_xfer,
101 .functionality = nvkm_i2c_bus_func,
104 /*******************************************************************************
106 ******************************************************************************/
108 nvkm_i2c_bus_init(struct nvkm_i2c_bus *bus)
110 BUS_TRACE(bus, "init");
112 bus->func->init(bus);
114 mutex_lock(&bus->mutex);
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");
133 nvkm_i2c_pad_release(pad);
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);
147 ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_I2C);
152 mutex_unlock(&bus->mutex);
157 nvkm_i2c_bus_probe(struct nvkm_i2c_bus *bus, const char *what,
158 struct nvkm_i2c_bus_probe *info,
159 bool (*match)(struct nvkm_i2c_bus *,
160 struct i2c_board_info *, void *), void *data)
164 BUS_DBG(bus, "probing %ss", what);
165 for (i = 0; info[i].dev.addr; i++) {
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",
171 info[i].udelay, algo->udelay);
172 orig_udelay = algo->udelay;
173 algo->udelay = info[i].udelay;
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",
179 what, info[i].dev.type);
184 struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
185 algo->udelay = orig_udelay;
189 BUS_DBG(bus, "no devices found.");
194 nvkm_i2c_bus_del(struct nvkm_i2c_bus **pbus)
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);
208 nvkm_i2c_bus_ctor(const struct nvkm_i2c_bus_func *func,
209 struct nvkm_i2c_pad *pad, int id,
210 struct nvkm_i2c_bus *bus)
212 struct nvkm_device *device = pad->i2c->subdev.device;
213 struct i2c_algo_bit_data *bit;
214 #ifndef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
215 const bool internal = false;
217 const bool internal = true;
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",
229 dev_name(device->dev), id);
230 bus->i2c.owner = THIS_MODULE;
231 bus->i2c.dev.parent = device->dev;
233 if ( bus->func->drive_scl &&
234 !nvkm_boolopt(device->cfgopt, "NvI2C", internal)) {
235 if (!(bit = kzalloc(sizeof(*bit), GFP_KERNEL)))
238 bit->timeout = usecs_to_jiffies(2200);
240 bit->pre_xfer = nvkm_i2c_bus_pre_xfer;
241 bit->post_xfer = nvkm_i2c_bus_post_xfer;
242 bit->setscl = nvkm_i2c_bus_setscl;
243 bit->setsda = nvkm_i2c_bus_setsda;
244 bit->getscl = nvkm_i2c_bus_getscl;
245 bit->getsda = nvkm_i2c_bus_getsda;
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);
257 nvkm_i2c_bus_new_(const struct nvkm_i2c_bus_func *func,
258 struct nvkm_i2c_pad *pad, int id,
259 struct nvkm_i2c_bus **pbus)
261 if (!(*pbus = kzalloc(sizeof(**pbus), GFP_KERNEL)))
263 return nvkm_i2c_bus_ctor(func, pad, id, *pbus);