]>
Commit | Line | Data |
---|---|---|
9e501086 MB |
1 | /* |
2 | * wm8994-core.c -- Device access for Wolfson WM8994 | |
3 | * | |
4 | * Copyright 2009 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/mfd/core.h> | |
20 | #include <linux/regulator/consumer.h> | |
21 | #include <linux/regulator/machine.h> | |
22 | ||
23 | #include <linux/mfd/wm8994/core.h> | |
24 | #include <linux/mfd/wm8994/pdata.h> | |
25 | #include <linux/mfd/wm8994/registers.h> | |
26 | ||
27 | static int wm8994_read(struct wm8994 *wm8994, unsigned short reg, | |
28 | int bytes, void *dest) | |
29 | { | |
30 | int ret, i; | |
31 | u16 *buf = dest; | |
32 | ||
33 | BUG_ON(bytes % 2); | |
34 | BUG_ON(bytes <= 0); | |
35 | ||
36 | ret = wm8994->read_dev(wm8994, reg, bytes, dest); | |
37 | if (ret < 0) | |
38 | return ret; | |
39 | ||
40 | for (i = 0; i < bytes / 2; i++) { | |
41 | buf[i] = be16_to_cpu(buf[i]); | |
42 | ||
43 | dev_vdbg(wm8994->dev, "Read %04x from R%d(0x%x)\n", | |
44 | buf[i], reg + i, reg + i); | |
45 | } | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | /** | |
51 | * wm8994_reg_read: Read a single WM8994 register. | |
52 | * | |
53 | * @wm8994: Device to read from. | |
54 | * @reg: Register to read. | |
55 | */ | |
56 | int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg) | |
57 | { | |
58 | unsigned short val; | |
59 | int ret; | |
60 | ||
61 | mutex_lock(&wm8994->io_lock); | |
62 | ||
63 | ret = wm8994_read(wm8994, reg, 2, &val); | |
64 | ||
65 | mutex_unlock(&wm8994->io_lock); | |
66 | ||
67 | if (ret < 0) | |
68 | return ret; | |
69 | else | |
70 | return val; | |
71 | } | |
72 | EXPORT_SYMBOL_GPL(wm8994_reg_read); | |
73 | ||
74 | /** | |
75 | * wm8994_bulk_read: Read multiple WM8994 registers | |
76 | * | |
77 | * @wm8994: Device to read from | |
78 | * @reg: First register | |
79 | * @count: Number of registers | |
80 | * @buf: Buffer to fill. | |
81 | */ | |
82 | int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg, | |
83 | int count, u16 *buf) | |
84 | { | |
85 | int ret; | |
86 | ||
87 | mutex_lock(&wm8994->io_lock); | |
88 | ||
89 | ret = wm8994_read(wm8994, reg, count * 2, buf); | |
90 | ||
91 | mutex_unlock(&wm8994->io_lock); | |
92 | ||
93 | return ret; | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(wm8994_bulk_read); | |
96 | ||
97 | static int wm8994_write(struct wm8994 *wm8994, unsigned short reg, | |
98 | int bytes, void *src) | |
99 | { | |
100 | u16 *buf = src; | |
101 | int i; | |
102 | ||
103 | BUG_ON(bytes % 2); | |
104 | BUG_ON(bytes <= 0); | |
105 | ||
106 | for (i = 0; i < bytes / 2; i++) { | |
107 | dev_vdbg(wm8994->dev, "Write %04x to R%d(0x%x)\n", | |
108 | buf[i], reg + i, reg + i); | |
109 | ||
110 | buf[i] = cpu_to_be16(buf[i]); | |
111 | } | |
112 | ||
113 | return wm8994->write_dev(wm8994, reg, bytes, src); | |
114 | } | |
115 | ||
116 | /** | |
117 | * wm8994_reg_write: Write a single WM8994 register. | |
118 | * | |
119 | * @wm8994: Device to write to. | |
120 | * @reg: Register to write to. | |
121 | * @val: Value to write. | |
122 | */ | |
123 | int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg, | |
124 | unsigned short val) | |
125 | { | |
126 | int ret; | |
127 | ||
128 | mutex_lock(&wm8994->io_lock); | |
129 | ||
130 | ret = wm8994_write(wm8994, reg, 2, &val); | |
131 | ||
132 | mutex_unlock(&wm8994->io_lock); | |
133 | ||
134 | return ret; | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(wm8994_reg_write); | |
137 | ||
138 | /** | |
139 | * wm8994_set_bits: Set the value of a bitfield in a WM8994 register | |
140 | * | |
141 | * @wm8994: Device to write to. | |
142 | * @reg: Register to write to. | |
143 | * @mask: Mask of bits to set. | |
144 | * @val: Value to set (unshifted) | |
145 | */ | |
146 | int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg, | |
147 | unsigned short mask, unsigned short val) | |
148 | { | |
149 | int ret; | |
150 | u16 r; | |
151 | ||
152 | mutex_lock(&wm8994->io_lock); | |
153 | ||
154 | ret = wm8994_read(wm8994, reg, 2, &r); | |
155 | if (ret < 0) | |
156 | goto out; | |
157 | ||
158 | r &= ~mask; | |
159 | r |= val; | |
160 | ||
161 | ret = wm8994_write(wm8994, reg, 2, &r); | |
162 | ||
163 | out: | |
164 | mutex_unlock(&wm8994->io_lock); | |
165 | ||
166 | return ret; | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(wm8994_set_bits); | |
169 | ||
170 | static struct mfd_cell wm8994_regulator_devs[] = { | |
171 | { .name = "wm8994-ldo", .id = 1 }, | |
172 | { .name = "wm8994-ldo", .id = 2 }, | |
173 | }; | |
174 | ||
175 | static struct mfd_cell wm8994_devs[] = { | |
176 | { .name = "wm8994-codec" }, | |
177 | { .name = "wm8994-gpio" }, | |
178 | }; | |
179 | ||
180 | /* | |
181 | * Supplies for the main bulk of CODEC; the LDO supplies are ignored | |
182 | * and should be handled via the standard regulator API supply | |
183 | * management. | |
184 | */ | |
185 | static const char *wm8994_main_supplies[] = { | |
186 | "DBVDD", | |
187 | "DCVDD", | |
188 | "AVDD1", | |
189 | "AVDD2", | |
190 | "CPVDD", | |
191 | "SPKVDD1", | |
192 | "SPKVDD2", | |
193 | }; | |
194 | ||
195 | #ifdef CONFIG_PM | |
196 | static int wm8994_device_suspend(struct device *dev) | |
197 | { | |
198 | struct wm8994 *wm8994 = dev_get_drvdata(dev); | |
199 | int ret; | |
200 | ||
201 | /* GPIO configuration state is saved here since we may be configuring | |
202 | * the GPIO alternate functions even if we're not using the gpiolib | |
203 | * driver for them. | |
204 | */ | |
205 | ret = wm8994_read(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2, | |
206 | &wm8994->gpio_regs); | |
207 | if (ret < 0) | |
208 | dev_err(dev, "Failed to save GPIO registers: %d\n", ret); | |
209 | ||
210 | /* For similar reasons we also stash the regulator states */ | |
211 | ret = wm8994_read(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2, | |
212 | &wm8994->ldo_regs); | |
213 | if (ret < 0) | |
214 | dev_err(dev, "Failed to save LDO registers: %d\n", ret); | |
215 | ||
216 | ret = regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies), | |
217 | wm8994->supplies); | |
218 | if (ret != 0) { | |
219 | dev_err(dev, "Failed to disable supplies: %d\n", ret); | |
220 | return ret; | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int wm8994_device_resume(struct device *dev) | |
227 | { | |
228 | struct wm8994 *wm8994 = dev_get_drvdata(dev); | |
229 | int ret; | |
230 | ||
231 | ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies), | |
232 | wm8994->supplies); | |
233 | if (ret != 0) { | |
234 | dev_err(dev, "Failed to enable supplies: %d\n", ret); | |
235 | return ret; | |
236 | } | |
237 | ||
238 | ret = wm8994_write(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2, | |
239 | &wm8994->ldo_regs); | |
240 | if (ret < 0) | |
241 | dev_err(dev, "Failed to restore LDO registers: %d\n", ret); | |
242 | ||
243 | ret = wm8994_write(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2, | |
244 | &wm8994->gpio_regs); | |
245 | if (ret < 0) | |
246 | dev_err(dev, "Failed to restore GPIO registers: %d\n", ret); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | #endif | |
251 | ||
252 | #ifdef CONFIG_REGULATOR | |
253 | static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) | |
254 | { | |
255 | struct wm8994_ldo_pdata *ldo_pdata; | |
256 | ||
257 | if (!pdata) | |
258 | return 0; | |
259 | ||
260 | ldo_pdata = &pdata->ldo[ldo]; | |
261 | ||
262 | if (!ldo_pdata->init_data) | |
263 | return 0; | |
264 | ||
265 | return ldo_pdata->init_data->num_consumer_supplies != 0; | |
266 | } | |
267 | #else | |
268 | static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) | |
269 | { | |
270 | return 0; | |
271 | } | |
272 | #endif | |
273 | ||
274 | /* | |
275 | * Instantiate the generic non-control parts of the device. | |
276 | */ | |
277 | static int wm8994_device_init(struct wm8994 *wm8994, unsigned long id, int irq) | |
278 | { | |
279 | struct wm8994_pdata *pdata = wm8994->dev->platform_data; | |
280 | int ret, i; | |
281 | ||
282 | mutex_init(&wm8994->io_lock); | |
283 | dev_set_drvdata(wm8994->dev, wm8994); | |
284 | ||
285 | /* Add the on-chip regulators first for bootstrapping */ | |
286 | ret = mfd_add_devices(wm8994->dev, -1, | |
287 | wm8994_regulator_devs, | |
288 | ARRAY_SIZE(wm8994_regulator_devs), | |
289 | NULL, 0); | |
290 | if (ret != 0) { | |
291 | dev_err(wm8994->dev, "Failed to add children: %d\n", ret); | |
292 | goto err; | |
293 | } | |
294 | ||
295 | wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) * | |
296 | ARRAY_SIZE(wm8994_main_supplies), | |
297 | GFP_KERNEL); | |
298 | if (!wm8994->supplies) | |
299 | goto err; | |
300 | ||
301 | for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++) | |
302 | wm8994->supplies[i].supply = wm8994_main_supplies[i]; | |
303 | ||
304 | ret = regulator_bulk_get(wm8994->dev, ARRAY_SIZE(wm8994_main_supplies), | |
305 | wm8994->supplies); | |
306 | if (ret != 0) { | |
307 | dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret); | |
7731074a | 308 | goto err_supplies; |
9e501086 MB |
309 | } |
310 | ||
311 | ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies), | |
312 | wm8994->supplies); | |
313 | if (ret != 0) { | |
314 | dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret); | |
7731074a | 315 | goto err_get; |
9e501086 MB |
316 | } |
317 | ||
318 | ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET); | |
319 | if (ret < 0) { | |
320 | dev_err(wm8994->dev, "Failed to read ID register\n"); | |
321 | goto err_enable; | |
322 | } | |
323 | if (ret != 0x8994) { | |
324 | dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n", | |
325 | ret); | |
326 | ret = -EINVAL; | |
327 | goto err_enable; | |
328 | } | |
329 | ||
330 | ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION); | |
331 | if (ret < 0) { | |
332 | dev_err(wm8994->dev, "Failed to read revision register: %d\n", | |
333 | ret); | |
334 | goto err_enable; | |
335 | } | |
336 | ||
337 | switch (ret) { | |
338 | case 0: | |
339 | case 1: | |
340 | dev_warn(wm8994->dev, "revision %c not fully supported\n", | |
341 | 'A' + ret); | |
342 | break; | |
343 | default: | |
344 | dev_info(wm8994->dev, "revision %c\n", 'A' + ret); | |
345 | break; | |
346 | } | |
347 | ||
348 | ||
349 | if (pdata) { | |
350 | wm8994->gpio_base = pdata->gpio_base; | |
351 | ||
352 | /* GPIO configuration is only applied if it's non-zero */ | |
353 | for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) { | |
354 | if (pdata->gpio_defaults[i]) { | |
355 | wm8994_set_bits(wm8994, WM8994_GPIO_1 + i, | |
356 | 0xffff, | |
357 | pdata->gpio_defaults[i]); | |
358 | } | |
359 | } | |
360 | } | |
361 | ||
362 | /* In some system designs where the regulators are not in use, | |
363 | * we can achieve a small reduction in leakage currents by | |
364 | * floating LDO outputs. This bit makes no difference if the | |
365 | * LDOs are enabled, it only affects cases where the LDOs were | |
366 | * in operation and are then disabled. | |
367 | */ | |
368 | for (i = 0; i < WM8994_NUM_LDO_REGS; i++) { | |
369 | if (wm8994_ldo_in_use(pdata, i)) | |
370 | wm8994_set_bits(wm8994, WM8994_LDO_1 + i, | |
371 | WM8994_LDO1_DISCH, WM8994_LDO1_DISCH); | |
372 | else | |
373 | wm8994_set_bits(wm8994, WM8994_LDO_1 + i, | |
374 | WM8994_LDO1_DISCH, 0); | |
375 | } | |
376 | ||
377 | ret = mfd_add_devices(wm8994->dev, -1, | |
378 | wm8994_devs, ARRAY_SIZE(wm8994_devs), | |
379 | NULL, 0); | |
380 | if (ret != 0) { | |
381 | dev_err(wm8994->dev, "Failed to add children: %d\n", ret); | |
382 | goto err_enable; | |
383 | } | |
384 | ||
385 | return 0; | |
386 | ||
387 | err_enable: | |
388 | regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies), | |
389 | wm8994->supplies); | |
390 | err_get: | |
391 | regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies); | |
392 | err_supplies: | |
393 | kfree(wm8994->supplies); | |
394 | err: | |
395 | mfd_remove_devices(wm8994->dev); | |
396 | kfree(wm8994); | |
397 | return ret; | |
398 | } | |
399 | ||
400 | static void wm8994_device_exit(struct wm8994 *wm8994) | |
401 | { | |
402 | mfd_remove_devices(wm8994->dev); | |
403 | regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies), | |
404 | wm8994->supplies); | |
405 | regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies); | |
406 | kfree(wm8994->supplies); | |
407 | kfree(wm8994); | |
408 | } | |
409 | ||
410 | static int wm8994_i2c_read_device(struct wm8994 *wm8994, unsigned short reg, | |
411 | int bytes, void *dest) | |
412 | { | |
413 | struct i2c_client *i2c = wm8994->control_data; | |
414 | int ret; | |
415 | u16 r = cpu_to_be16(reg); | |
416 | ||
417 | ret = i2c_master_send(i2c, (unsigned char *)&r, 2); | |
418 | if (ret < 0) | |
419 | return ret; | |
420 | if (ret != 2) | |
421 | return -EIO; | |
422 | ||
423 | ret = i2c_master_recv(i2c, dest, bytes); | |
424 | if (ret < 0) | |
425 | return ret; | |
426 | if (ret != bytes) | |
427 | return -EIO; | |
428 | return 0; | |
429 | } | |
430 | ||
431 | /* Currently we allocate the write buffer on the stack; this is OK for | |
432 | * small writes - if we need to do large writes this will need to be | |
433 | * revised. | |
434 | */ | |
435 | static int wm8994_i2c_write_device(struct wm8994 *wm8994, unsigned short reg, | |
436 | int bytes, void *src) | |
437 | { | |
438 | struct i2c_client *i2c = wm8994->control_data; | |
439 | unsigned char msg[bytes + 2]; | |
440 | int ret; | |
441 | ||
442 | reg = cpu_to_be16(reg); | |
443 | memcpy(&msg[0], ®, 2); | |
444 | memcpy(&msg[2], src, bytes); | |
445 | ||
446 | ret = i2c_master_send(i2c, msg, bytes + 2); | |
447 | if (ret < 0) | |
448 | return ret; | |
449 | if (ret < bytes + 2) | |
450 | return -EIO; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static int wm8994_i2c_probe(struct i2c_client *i2c, | |
456 | const struct i2c_device_id *id) | |
457 | { | |
458 | struct wm8994 *wm8994; | |
459 | ||
460 | wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL); | |
461 | if (wm8994 == NULL) { | |
462 | kfree(i2c); | |
463 | return -ENOMEM; | |
464 | } | |
465 | ||
466 | i2c_set_clientdata(i2c, wm8994); | |
467 | wm8994->dev = &i2c->dev; | |
468 | wm8994->control_data = i2c; | |
469 | wm8994->read_dev = wm8994_i2c_read_device; | |
470 | wm8994->write_dev = wm8994_i2c_write_device; | |
471 | ||
472 | return wm8994_device_init(wm8994, id->driver_data, i2c->irq); | |
473 | } | |
474 | ||
475 | static int wm8994_i2c_remove(struct i2c_client *i2c) | |
476 | { | |
477 | struct wm8994 *wm8994 = i2c_get_clientdata(i2c); | |
478 | ||
479 | wm8994_device_exit(wm8994); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | #ifdef CONFIG_PM | |
485 | static int wm8994_i2c_suspend(struct i2c_client *i2c, pm_message_t state) | |
486 | { | |
487 | return wm8994_device_suspend(&i2c->dev); | |
488 | } | |
489 | ||
490 | static int wm8994_i2c_resume(struct i2c_client *i2c) | |
491 | { | |
492 | return wm8994_device_resume(&i2c->dev); | |
493 | } | |
494 | #else | |
495 | #define wm8994_i2c_suspend NULL | |
496 | #define wm8994_i2c_resume NULL | |
497 | #endif | |
498 | ||
499 | static const struct i2c_device_id wm8994_i2c_id[] = { | |
500 | { "wm8994", 0 }, | |
501 | { } | |
502 | }; | |
503 | MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id); | |
504 | ||
505 | static struct i2c_driver wm8994_i2c_driver = { | |
506 | .driver = { | |
507 | .name = "wm8994", | |
508 | .owner = THIS_MODULE, | |
509 | }, | |
510 | .probe = wm8994_i2c_probe, | |
511 | .remove = wm8994_i2c_remove, | |
512 | .suspend = wm8994_i2c_suspend, | |
513 | .resume = wm8994_i2c_resume, | |
514 | .id_table = wm8994_i2c_id, | |
515 | }; | |
516 | ||
517 | static int __init wm8994_i2c_init(void) | |
518 | { | |
519 | int ret; | |
520 | ||
521 | ret = i2c_add_driver(&wm8994_i2c_driver); | |
522 | if (ret != 0) | |
523 | pr_err("Failed to register wm8994 I2C driver: %d\n", ret); | |
524 | ||
525 | return ret; | |
526 | } | |
527 | module_init(wm8994_i2c_init); | |
528 | ||
529 | static void __exit wm8994_i2c_exit(void) | |
530 | { | |
531 | i2c_del_driver(&wm8994_i2c_driver); | |
532 | } | |
533 | module_exit(wm8994_i2c_exit); | |
534 | ||
535 | MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC"); | |
536 | MODULE_LICENSE("GPL"); | |
537 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |