2 * Copyright 2013 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.
25 #include <core/option.h>
27 #include <subdev/bios.h>
28 #include <subdev/bios/dcb.h>
29 #include <subdev/bios/i2c.h>
30 #include <subdev/i2c.h>
31 #include <subdev/vga.h>
33 /******************************************************************************
34 * interface to linux i2c bit-banging algorithm
35 *****************************************************************************/
37 #ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
44 nouveau_i2c_pre_xfer(struct i2c_adapter *adap)
46 struct i2c_algo_bit_data *bit = adap->algo_data;
47 struct nouveau_i2c_port *port = bit->data;
48 if (port->func->acquire)
49 port->func->acquire(port);
54 nouveau_i2c_setscl(void *data, int state)
56 struct nouveau_i2c_port *port = data;
57 port->func->drive_scl(port, state);
61 nouveau_i2c_setsda(void *data, int state)
63 struct nouveau_i2c_port *port = data;
64 port->func->drive_sda(port, state);
68 nouveau_i2c_getscl(void *data)
70 struct nouveau_i2c_port *port = data;
71 return port->func->sense_scl(port);
75 nouveau_i2c_getsda(void *data)
77 struct nouveau_i2c_port *port = data;
78 return port->func->sense_sda(port);
81 /******************************************************************************
82 * base i2c "port" class implementation
83 *****************************************************************************/
86 _nouveau_i2c_port_dtor(struct nouveau_object *object)
88 struct nouveau_i2c_port *port = (void *)object;
89 i2c_del_adapter(&port->adapter);
90 nouveau_object_destroy(&port->base);
94 nouveau_i2c_port_create_(struct nouveau_object *parent,
95 struct nouveau_object *engine,
96 struct nouveau_oclass *oclass, u8 index,
97 const struct i2c_algorithm *algo,
98 const struct nouveau_i2c_func *func,
99 int size, void **pobject)
101 struct nouveau_device *device = nv_device(parent);
102 struct nouveau_i2c *i2c = (void *)engine;
103 struct nouveau_i2c_port *port;
106 ret = nouveau_object_create_(parent, engine, oclass, 0, size, pobject);
111 snprintf(port->adapter.name, sizeof(port->adapter.name),
112 "nouveau-%s-%d", device->name, index);
113 port->adapter.owner = THIS_MODULE;
114 port->adapter.dev.parent = &device->pdev->dev;
117 i2c_set_adapdata(&port->adapter, i2c);
119 if ( algo == &nouveau_i2c_bit_algo &&
120 !nouveau_boolopt(device->cfgopt, "NvI2C", CSTMSEL)) {
121 struct i2c_algo_bit_data *bit;
123 bit = kzalloc(sizeof(*bit), GFP_KERNEL);
128 bit->timeout = usecs_to_jiffies(2200);
130 bit->pre_xfer = nouveau_i2c_pre_xfer;
131 bit->setsda = nouveau_i2c_setsda;
132 bit->setscl = nouveau_i2c_setscl;
133 bit->getsda = nouveau_i2c_getsda;
134 bit->getscl = nouveau_i2c_getscl;
136 port->adapter.algo_data = bit;
137 ret = i2c_bit_add_bus(&port->adapter);
139 port->adapter.algo_data = port;
140 port->adapter.algo = algo;
141 ret = i2c_add_adapter(&port->adapter);
144 /* drop port's i2c subdev refcount, i2c handles this itself */
146 list_add_tail(&port->head, &i2c->ports);
150 /******************************************************************************
151 * base i2c subdev class implementation
152 *****************************************************************************/
154 static struct nouveau_i2c_port *
155 nouveau_i2c_find(struct nouveau_i2c *i2c, u8 index)
157 struct nouveau_bios *bios = nouveau_bios(i2c);
158 struct nouveau_i2c_port *port;
160 if (index == NV_I2C_DEFAULT(0) ||
161 index == NV_I2C_DEFAULT(1)) {
162 u8 ver, hdr, cnt, len;
163 u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
164 if (i2c && ver >= 0x30) {
165 u8 auxidx = nv_ro08(bios, i2c + 4);
166 if (index == NV_I2C_DEFAULT(0))
167 index = (auxidx & 0x0f) >> 0;
169 index = (auxidx & 0xf0) >> 4;
175 list_for_each_entry(port, &i2c->ports, head) {
176 if (port->index == index)
183 static struct nouveau_i2c_port *
184 nouveau_i2c_find_type(struct nouveau_i2c *i2c, u16 type)
186 struct nouveau_i2c_port *port;
188 list_for_each_entry(port, &i2c->ports, head) {
189 if (nv_hclass(port) == type)
197 nouveau_i2c_identify(struct nouveau_i2c *i2c, int index, const char *what,
198 struct nouveau_i2c_board_info *info,
199 bool (*match)(struct nouveau_i2c_port *,
200 struct i2c_board_info *, void *), void *data)
202 struct nouveau_i2c_port *port = nouveau_i2c_find(i2c, index);
206 nv_debug(i2c, "no bus when probing %s on %d\n", what, index);
210 nv_debug(i2c, "probing %ss on bus: %d\n", what, port->index);
211 for (i = 0; info[i].dev.addr; i++) {
214 if ((port->adapter.algo == &i2c_bit_algo) &&
215 (info[i].udelay != 0)) {
216 struct i2c_algo_bit_data *algo = port->adapter.algo_data;
217 nv_debug(i2c, "using custom udelay %d instead of %d\n",
218 info[i].udelay, algo->udelay);
219 orig_udelay = algo->udelay;
220 algo->udelay = info[i].udelay;
223 if (nv_probe_i2c(port, info[i].dev.addr) &&
224 (!match || match(port, &info[i].dev, data))) {
225 nv_info(i2c, "detected %s: %s\n", what,
231 struct i2c_algo_bit_data *algo = port->adapter.algo_data;
232 algo->udelay = orig_udelay;
236 nv_debug(i2c, "no devices found.\n");
241 _nouveau_i2c_fini(struct nouveau_object *object, bool suspend)
243 struct nouveau_i2c *i2c = (void *)object;
244 struct nouveau_i2c_port *port;
247 list_for_each_entry(port, &i2c->ports, head) {
248 ret = nv_ofuncs(port)->fini(nv_object(port), suspend);
253 return nouveau_subdev_fini(&i2c->base, suspend);
255 list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
256 nv_ofuncs(port)->init(nv_object(port));
263 _nouveau_i2c_init(struct nouveau_object *object)
265 struct nouveau_i2c *i2c = (void *)object;
266 struct nouveau_i2c_port *port;
269 ret = nouveau_subdev_init(&i2c->base);
271 list_for_each_entry(port, &i2c->ports, head) {
272 ret = nv_ofuncs(port)->init(nv_object(port));
280 list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
281 nv_ofuncs(port)->fini(nv_object(port), false);
288 _nouveau_i2c_dtor(struct nouveau_object *object)
290 struct nouveau_i2c *i2c = (void *)object;
291 struct nouveau_i2c_port *port, *temp;
293 list_for_each_entry_safe(port, temp, &i2c->ports, head) {
294 nouveau_object_ref(NULL, (struct nouveau_object **)&port);
297 nouveau_subdev_destroy(&i2c->base);
300 static struct nouveau_oclass *
301 nouveau_i2c_extdev_sclass[] = {
302 nouveau_anx9805_sclass,
306 nouveau_i2c_create_(struct nouveau_object *parent,
307 struct nouveau_object *engine,
308 struct nouveau_oclass *oclass,
309 struct nouveau_oclass *sclass,
310 int length, void **pobject)
312 struct nouveau_bios *bios = nouveau_bios(parent);
313 struct nouveau_i2c *i2c;
314 struct nouveau_object *object;
315 struct dcb_i2c_entry info;
316 int ret, i, j, index = -1;
317 struct dcb_output outp;
321 ret = nouveau_subdev_create(parent, engine, oclass, 0,
323 *pobject = nv_object(i2c);
327 i2c->find = nouveau_i2c_find;
328 i2c->find_type = nouveau_i2c_find_type;
329 i2c->identify = nouveau_i2c_identify;
330 INIT_LIST_HEAD(&i2c->ports);
332 while (!dcb_i2c_parse(bios, ++index, &info)) {
333 if (info.type == DCB_I2C_UNUSED)
339 if (oclass->handle == info.type) {
340 ret = nouveau_object_ctor(*pobject, *pobject,
344 } while (ret && (++oclass)->handle);
347 /* in addition to the busses specified in the i2c table, there
348 * may be ddc/aux channels hiding behind external tmds/dp/etc
351 index = ((index + 0x0f) / 0x10) * 0x10;
353 while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) {
354 if (!outp.location || !outp.extdev)
358 case DCB_OUTPUT_TMDS:
359 info.type = NV_I2C_TYPE_EXTDDC(outp.extdev);
362 info.type = NV_I2C_TYPE_EXTAUX(outp.extdev);
370 while (ret && ++j < ARRAY_SIZE(nouveau_i2c_extdev_sclass)) {
371 parent = nv_object(i2c->find(i2c, outp.i2c_index));
372 oclass = nouveau_i2c_extdev_sclass[j];
374 if (oclass->handle != info.type)
376 ret = nouveau_object_ctor(parent, *pobject,
379 } while (ret && (++oclass)->handle);