1 | /* $NetBSD: nouveau_subdev_i2c_base.c,v 1.1.1.1 2014/08/06 12:36:30 riastradh Exp $ */ |
2 | |
3 | /* |
4 | * Copyright 2013 Red Hat Inc. |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a |
7 | * copy of this software and associated documentation files (the "Software"), |
8 | * to deal in the Software without restriction, including without limitation |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
10 | * and/or sell copies of the Software, and to permit persons to whom the |
11 | * Software is furnished to do so, subject to the following conditions: |
12 | * |
13 | * The above copyright notice and this permission notice shall be included in |
14 | * all copies or substantial portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
22 | * OTHER DEALINGS IN THE SOFTWARE. |
23 | * |
24 | * Authors: Ben Skeggs |
25 | */ |
26 | |
27 | #include <sys/cdefs.h> |
28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_i2c_base.c,v 1.1.1.1 2014/08/06 12:36:30 riastradh Exp $" ); |
29 | |
30 | #include <core/option.h> |
31 | |
32 | #include <subdev/bios.h> |
33 | #include <subdev/bios/dcb.h> |
34 | #include <subdev/bios/i2c.h> |
35 | #include <subdev/i2c.h> |
36 | #include <subdev/vga.h> |
37 | |
38 | /****************************************************************************** |
39 | * interface to linux i2c bit-banging algorithm |
40 | *****************************************************************************/ |
41 | |
42 | #ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT |
43 | #define CSTMSEL true |
44 | #else |
45 | #define CSTMSEL false |
46 | #endif |
47 | |
48 | static int |
49 | nouveau_i2c_pre_xfer(struct i2c_adapter *adap) |
50 | { |
51 | struct i2c_algo_bit_data *bit = adap->algo_data; |
52 | struct nouveau_i2c_port *port = bit->data; |
53 | if (port->func->acquire) |
54 | port->func->acquire(port); |
55 | return 0; |
56 | } |
57 | |
58 | static void |
59 | nouveau_i2c_setscl(void *data, int state) |
60 | { |
61 | struct nouveau_i2c_port *port = data; |
62 | port->func->drive_scl(port, state); |
63 | } |
64 | |
65 | static void |
66 | nouveau_i2c_setsda(void *data, int state) |
67 | { |
68 | struct nouveau_i2c_port *port = data; |
69 | port->func->drive_sda(port, state); |
70 | } |
71 | |
72 | static int |
73 | nouveau_i2c_getscl(void *data) |
74 | { |
75 | struct nouveau_i2c_port *port = data; |
76 | return port->func->sense_scl(port); |
77 | } |
78 | |
79 | static int |
80 | nouveau_i2c_getsda(void *data) |
81 | { |
82 | struct nouveau_i2c_port *port = data; |
83 | return port->func->sense_sda(port); |
84 | } |
85 | |
86 | /****************************************************************************** |
87 | * base i2c "port" class implementation |
88 | *****************************************************************************/ |
89 | |
90 | void |
91 | _nouveau_i2c_port_dtor(struct nouveau_object *object) |
92 | { |
93 | struct nouveau_i2c_port *port = (void *)object; |
94 | i2c_del_adapter(&port->adapter); |
95 | nouveau_object_destroy(&port->base); |
96 | } |
97 | |
98 | int |
99 | nouveau_i2c_port_create_(struct nouveau_object *parent, |
100 | struct nouveau_object *engine, |
101 | struct nouveau_oclass *oclass, u8 index, |
102 | const struct i2c_algorithm *algo, |
103 | const struct nouveau_i2c_func *func, |
104 | int size, void **pobject) |
105 | { |
106 | struct nouveau_device *device = nv_device(parent); |
107 | struct nouveau_i2c *i2c = (void *)engine; |
108 | struct nouveau_i2c_port *port; |
109 | int ret; |
110 | |
111 | ret = nouveau_object_create_(parent, engine, oclass, 0, size, pobject); |
112 | port = *pobject; |
113 | if (ret) |
114 | return ret; |
115 | |
116 | snprintf(port->adapter.name, sizeof(port->adapter.name), |
117 | "nouveau-%s-%d" , device->name, index); |
118 | port->adapter.owner = THIS_MODULE; |
119 | port->adapter.dev.parent = nv_device_base(device); |
120 | port->index = index; |
121 | port->func = func; |
122 | i2c_set_adapdata(&port->adapter, i2c); |
123 | |
124 | if ( algo == &nouveau_i2c_bit_algo && |
125 | !nouveau_boolopt(device->cfgopt, "NvI2C" , CSTMSEL)) { |
126 | struct i2c_algo_bit_data *bit; |
127 | |
128 | bit = kzalloc(sizeof(*bit), GFP_KERNEL); |
129 | if (!bit) |
130 | return -ENOMEM; |
131 | |
132 | bit->udelay = 10; |
133 | bit->timeout = usecs_to_jiffies(2200); |
134 | bit->data = port; |
135 | bit->pre_xfer = nouveau_i2c_pre_xfer; |
136 | bit->setsda = nouveau_i2c_setsda; |
137 | bit->setscl = nouveau_i2c_setscl; |
138 | bit->getsda = nouveau_i2c_getsda; |
139 | bit->getscl = nouveau_i2c_getscl; |
140 | |
141 | port->adapter.algo_data = bit; |
142 | ret = i2c_bit_add_bus(&port->adapter); |
143 | } else { |
144 | port->adapter.algo_data = port; |
145 | port->adapter.algo = algo; |
146 | ret = i2c_add_adapter(&port->adapter); |
147 | } |
148 | |
149 | /* drop port's i2c subdev refcount, i2c handles this itself */ |
150 | if (ret == 0) |
151 | list_add_tail(&port->head, &i2c->ports); |
152 | return ret; |
153 | } |
154 | |
155 | /****************************************************************************** |
156 | * base i2c subdev class implementation |
157 | *****************************************************************************/ |
158 | |
159 | static struct nouveau_i2c_port * |
160 | nouveau_i2c_find(struct nouveau_i2c *i2c, u8 index) |
161 | { |
162 | struct nouveau_bios *bios = nouveau_bios(i2c); |
163 | struct nouveau_i2c_port *port; |
164 | |
165 | if (index == NV_I2C_DEFAULT(0) || |
166 | index == NV_I2C_DEFAULT(1)) { |
167 | u8 ver, hdr, cnt, len; |
168 | u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len); |
169 | if (i2c && ver >= 0x30) { |
170 | u8 auxidx = nv_ro08(bios, i2c + 4); |
171 | if (index == NV_I2C_DEFAULT(0)) |
172 | index = (auxidx & 0x0f) >> 0; |
173 | else |
174 | index = (auxidx & 0xf0) >> 4; |
175 | } else { |
176 | index = 2; |
177 | } |
178 | } |
179 | |
180 | list_for_each_entry(port, &i2c->ports, head) { |
181 | if (port->index == index) |
182 | return port; |
183 | } |
184 | |
185 | return NULL; |
186 | } |
187 | |
188 | static struct nouveau_i2c_port * |
189 | nouveau_i2c_find_type(struct nouveau_i2c *i2c, u16 type) |
190 | { |
191 | struct nouveau_i2c_port *port; |
192 | |
193 | list_for_each_entry(port, &i2c->ports, head) { |
194 | if (nv_hclass(port) == type) |
195 | return port; |
196 | } |
197 | |
198 | return NULL; |
199 | } |
200 | |
201 | static int |
202 | nouveau_i2c_identify(struct nouveau_i2c *i2c, int index, const char *what, |
203 | struct nouveau_i2c_board_info *info, |
204 | bool (*match)(struct nouveau_i2c_port *, |
205 | struct i2c_board_info *, void *), void *data) |
206 | { |
207 | struct nouveau_i2c_port *port = nouveau_i2c_find(i2c, index); |
208 | int i; |
209 | |
210 | if (!port) { |
211 | nv_debug(i2c, "no bus when probing %s on %d\n" , what, index); |
212 | return -ENODEV; |
213 | } |
214 | |
215 | nv_debug(i2c, "probing %ss on bus: %d\n" , what, port->index); |
216 | for (i = 0; info[i].dev.addr; i++) { |
217 | u8 orig_udelay = 0; |
218 | |
219 | if ((port->adapter.algo == &i2c_bit_algo) && |
220 | (info[i].udelay != 0)) { |
221 | struct i2c_algo_bit_data *algo = port->adapter.algo_data; |
222 | nv_debug(i2c, "using custom udelay %d instead of %d\n" , |
223 | info[i].udelay, algo->udelay); |
224 | orig_udelay = algo->udelay; |
225 | algo->udelay = info[i].udelay; |
226 | } |
227 | |
228 | if (nv_probe_i2c(port, info[i].dev.addr) && |
229 | (!match || match(port, &info[i].dev, data))) { |
230 | nv_info(i2c, "detected %s: %s\n" , what, |
231 | info[i].dev.type); |
232 | return i; |
233 | } |
234 | |
235 | if (orig_udelay) { |
236 | struct i2c_algo_bit_data *algo = port->adapter.algo_data; |
237 | algo->udelay = orig_udelay; |
238 | } |
239 | } |
240 | |
241 | nv_debug(i2c, "no devices found.\n" ); |
242 | return -ENODEV; |
243 | } |
244 | |
245 | int |
246 | _nouveau_i2c_fini(struct nouveau_object *object, bool suspend) |
247 | { |
248 | struct nouveau_i2c *i2c = (void *)object; |
249 | struct nouveau_i2c_port *port; |
250 | int ret; |
251 | |
252 | list_for_each_entry(port, &i2c->ports, head) { |
253 | ret = nv_ofuncs(port)->fini(nv_object(port), suspend); |
254 | if (ret && suspend) |
255 | goto fail; |
256 | } |
257 | |
258 | return nouveau_subdev_fini(&i2c->base, suspend); |
259 | fail: |
260 | list_for_each_entry_continue_reverse(port, &i2c->ports, head) { |
261 | nv_ofuncs(port)->init(nv_object(port)); |
262 | } |
263 | |
264 | return ret; |
265 | } |
266 | |
267 | int |
268 | _nouveau_i2c_init(struct nouveau_object *object) |
269 | { |
270 | struct nouveau_i2c *i2c = (void *)object; |
271 | struct nouveau_i2c_port *port; |
272 | int ret; |
273 | |
274 | ret = nouveau_subdev_init(&i2c->base); |
275 | if (ret == 0) { |
276 | list_for_each_entry(port, &i2c->ports, head) { |
277 | ret = nv_ofuncs(port)->init(nv_object(port)); |
278 | if (ret) |
279 | goto fail; |
280 | } |
281 | } |
282 | |
283 | return ret; |
284 | fail: |
285 | list_for_each_entry_continue_reverse(port, &i2c->ports, head) { |
286 | nv_ofuncs(port)->fini(nv_object(port), false); |
287 | } |
288 | |
289 | return ret; |
290 | } |
291 | |
292 | void |
293 | _nouveau_i2c_dtor(struct nouveau_object *object) |
294 | { |
295 | struct nouveau_i2c *i2c = (void *)object; |
296 | struct nouveau_i2c_port *port, *temp; |
297 | |
298 | list_for_each_entry_safe(port, temp, &i2c->ports, head) { |
299 | nouveau_object_ref(NULL, (struct nouveau_object **)&port); |
300 | } |
301 | |
302 | nouveau_subdev_destroy(&i2c->base); |
303 | } |
304 | |
305 | static struct nouveau_oclass * |
306 | nouveau_i2c_extdev_sclass[] = { |
307 | nouveau_anx9805_sclass, |
308 | }; |
309 | |
310 | int |
311 | nouveau_i2c_create_(struct nouveau_object *parent, |
312 | struct nouveau_object *engine, |
313 | struct nouveau_oclass *oclass, |
314 | struct nouveau_oclass *sclass, |
315 | int length, void **pobject) |
316 | { |
317 | struct nouveau_bios *bios = nouveau_bios(parent); |
318 | struct nouveau_i2c *i2c; |
319 | struct nouveau_object *object; |
320 | struct dcb_i2c_entry info; |
321 | int ret, i, j, index = -1; |
322 | struct dcb_output outp; |
323 | u8 ver, hdr; |
324 | u32 data; |
325 | |
326 | ret = nouveau_subdev_create(parent, engine, oclass, 0, |
327 | "I2C" , "i2c" , &i2c); |
328 | *pobject = nv_object(i2c); |
329 | if (ret) |
330 | return ret; |
331 | |
332 | i2c->find = nouveau_i2c_find; |
333 | i2c->find_type = nouveau_i2c_find_type; |
334 | i2c->identify = nouveau_i2c_identify; |
335 | INIT_LIST_HEAD(&i2c->ports); |
336 | |
337 | while (!dcb_i2c_parse(bios, ++index, &info)) { |
338 | if (info.type == DCB_I2C_UNUSED) |
339 | continue; |
340 | |
341 | oclass = sclass; |
342 | do { |
343 | ret = -EINVAL; |
344 | if (oclass->handle == info.type) { |
345 | ret = nouveau_object_ctor(*pobject, *pobject, |
346 | oclass, &info, |
347 | index, &object); |
348 | } |
349 | } while (ret && (++oclass)->handle); |
350 | } |
351 | |
352 | /* in addition to the busses specified in the i2c table, there |
353 | * may be ddc/aux channels hiding behind external tmds/dp/etc |
354 | * transmitters. |
355 | */ |
356 | index = ((index + 0x0f) / 0x10) * 0x10; |
357 | i = -1; |
358 | while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) { |
359 | if (!outp.location || !outp.extdev) |
360 | continue; |
361 | |
362 | switch (outp.type) { |
363 | case DCB_OUTPUT_TMDS: |
364 | info.type = NV_I2C_TYPE_EXTDDC(outp.extdev); |
365 | break; |
366 | case DCB_OUTPUT_DP: |
367 | info.type = NV_I2C_TYPE_EXTAUX(outp.extdev); |
368 | break; |
369 | default: |
370 | continue; |
371 | } |
372 | |
373 | ret = -ENODEV; |
374 | j = -1; |
375 | while (ret && ++j < ARRAY_SIZE(nouveau_i2c_extdev_sclass)) { |
376 | parent = nv_object(i2c->find(i2c, outp.i2c_index)); |
377 | oclass = nouveau_i2c_extdev_sclass[j]; |
378 | do { |
379 | if (oclass->handle != info.type) |
380 | continue; |
381 | ret = nouveau_object_ctor(parent, *pobject, |
382 | oclass, NULL, |
383 | index++, &object); |
384 | } while (ret && (++oclass)->handle); |
385 | } |
386 | } |
387 | |
388 | return 0; |
389 | } |
390 | |