tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * MFD driver for TWL6040 audio device
3 *
4 * Authors: Misael Lopez Cruz <misael.lopez@ti.com>
5 * Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
6 * Peter Ujfalusi <peter.ujfalusi@ti.com>
7 *
8 * Copyright: (C) 2011 Texas Instruments, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/kernel.h>
30#include <linux/platform_device.h>
31#include <linux/gpio.h>
32#include <linux/delay.h>
33#include <linux/i2c/twl.h>
34#include <linux/mfd/core.h>
35#include <linux/mfd/twl6040.h>
36
37static struct platform_device *twl6040_dev;
38
39int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
40{
41 int ret;
42 u8 val = 0;
43
44 mutex_lock(&twl6040->io_mutex);
45 ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
46 if (ret < 0) {
47 mutex_unlock(&twl6040->io_mutex);
48 return ret;
49 }
50 mutex_unlock(&twl6040->io_mutex);
51
52 return val;
53}
54EXPORT_SYMBOL(twl6040_reg_read);
55
56int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
57{
58 int ret;
59
60 mutex_lock(&twl6040->io_mutex);
61 ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
62 mutex_unlock(&twl6040->io_mutex);
63
64 return ret;
65}
66EXPORT_SYMBOL(twl6040_reg_write);
67
68int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
69{
70 int ret;
71 u8 val;
72
73 mutex_lock(&twl6040->io_mutex);
74 ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
75 if (ret)
76 goto out;
77
78 val |= mask;
79 ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
80out:
81 mutex_unlock(&twl6040->io_mutex);
82 return ret;
83}
84EXPORT_SYMBOL(twl6040_set_bits);
85
86int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
87{
88 int ret;
89 u8 val;
90
91 mutex_lock(&twl6040->io_mutex);
92 ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
93 if (ret)
94 goto out;
95
96 val &= ~mask;
97 ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
98out:
99 mutex_unlock(&twl6040->io_mutex);
100 return ret;
101}
102EXPORT_SYMBOL(twl6040_clear_bits);
103
104/* twl6040 codec manual power-up sequence */
105static int twl6040_power_up(struct twl6040 *twl6040)
106{
107 u8 ldoctl, ncpctl, lppllctl;
108 int ret;
109
110 /* enable high-side LDO, reference system and internal oscillator */
111 ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
112 ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
113 if (ret)
114 return ret;
115 usleep_range(10000, 10500);
116
117 /* enable negative charge pump */
118 ncpctl = TWL6040_NCPENA;
119 ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
120 if (ret)
121 goto ncp_err;
122 usleep_range(1000, 1500);
123
124 /* enable low-side LDO */
125 ldoctl |= TWL6040_LSLDOENA;
126 ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
127 if (ret)
128 goto lsldo_err;
129 usleep_range(1000, 1500);
130
131 /* enable low-power PLL */
132 lppllctl = TWL6040_LPLLENA;
133 ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
134 if (ret)
135 goto lppll_err;
136 usleep_range(5000, 5500);
137
138 /* disable internal oscillator */
139 ldoctl &= ~TWL6040_OSCENA;
140 ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
141 if (ret)
142 goto osc_err;
143
144 return 0;
145
146osc_err:
147 lppllctl &= ~TWL6040_LPLLENA;
148 twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
149lppll_err:
150 ldoctl &= ~TWL6040_LSLDOENA;
151 twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
152lsldo_err:
153 ncpctl &= ~TWL6040_NCPENA;
154 twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
155ncp_err:
156 ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
157 twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
158
159 return ret;
160}
161
162/* twl6040 manual power-down sequence */
163static void twl6040_power_down(struct twl6040 *twl6040)
164{
165 u8 ncpctl, ldoctl, lppllctl;
166
167 ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
168 ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
169 lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
170
171 /* enable internal oscillator */
172 ldoctl |= TWL6040_OSCENA;
173 twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
174 usleep_range(1000, 1500);
175
176 /* disable low-power PLL */
177 lppllctl &= ~TWL6040_LPLLENA;
178 twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
179
180 /* disable low-side LDO */
181 ldoctl &= ~TWL6040_LSLDOENA;
182 twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
183
184 /* disable negative charge pump */
185 ncpctl &= ~TWL6040_NCPENA;
186 twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
187
188 /* disable high-side LDO, reference system and internal oscillator */
189 ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
190 twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
191}
192
193static irqreturn_t twl6040_naudint_handler(int irq, void *data)
194{
195 struct twl6040 *twl6040 = data;
196 u8 intid, status;
197
198 intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
199
200 if (intid & TWL6040_READYINT)
201 complete(&twl6040->ready);
202
203 if (intid & TWL6040_THINT) {
204 status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
205 if (status & TWL6040_TSHUTDET) {
206 dev_warn(&twl6040_dev->dev,
207 "Thermal shutdown, powering-off");
208 twl6040_power(twl6040, 0);
209 } else {
210 dev_warn(&twl6040_dev->dev,
211 "Leaving thermal shutdown, powering-on");
212 twl6040_power(twl6040, 1);
213 }
214 }
215
216 return IRQ_HANDLED;
217}
218
219static int twl6040_power_up_completion(struct twl6040 *twl6040,
220 int naudint)
221{
222 int time_left;
223 u8 intid;
224
225 time_left = wait_for_completion_timeout(&twl6040->ready,
226 msecs_to_jiffies(144));
227 if (!time_left) {
228 intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
229 if (!(intid & TWL6040_READYINT)) {
230 dev_err(&twl6040_dev->dev,
231 "timeout waiting for READYINT\n");
232 return -ETIMEDOUT;
233 }
234 }
235
236 return 0;
237}
238
239int twl6040_power(struct twl6040 *twl6040, int on)
240{
241 int audpwron = twl6040->audpwron;
242 int naudint = twl6040->irq;
243 int ret = 0;
244
245 mutex_lock(&twl6040->mutex);
246
247 if (on) {
248 /* already powered-up */
249 if (twl6040->power_count++)
250 goto out;
251
252 if (gpio_is_valid(audpwron)) {
253 /* use AUDPWRON line */
254 gpio_set_value(audpwron, 1);
255 /* wait for power-up completion */
256 ret = twl6040_power_up_completion(twl6040, naudint);
257 if (ret) {
258 dev_err(&twl6040_dev->dev,
259 "automatic power-down failed\n");
260 twl6040->power_count = 0;
261 goto out;
262 }
263 } else {
264 /* use manual power-up sequence */
265 ret = twl6040_power_up(twl6040);
266 if (ret) {
267 dev_err(&twl6040_dev->dev,
268 "manual power-up failed\n");
269 twl6040->power_count = 0;
270 goto out;
271 }
272 }
273 /* Default PLL configuration after power up */
274 twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
275 twl6040->sysclk = 19200000;
276 } else {
277 /* already powered-down */
278 if (!twl6040->power_count) {
279 dev_err(&twl6040_dev->dev,
280 "device is already powered-off\n");
281 ret = -EPERM;
282 goto out;
283 }
284
285 if (--twl6040->power_count)
286 goto out;
287
288 if (gpio_is_valid(audpwron)) {
289 /* use AUDPWRON line */
290 gpio_set_value(audpwron, 0);
291
292 /* power-down sequence latency */
293 usleep_range(500, 700);
294 } else {
295 /* use manual power-down sequence */
296 twl6040_power_down(twl6040);
297 }
298 twl6040->sysclk = 0;
299 }
300
301out:
302 mutex_unlock(&twl6040->mutex);
303 return ret;
304}
305EXPORT_SYMBOL(twl6040_power);
306
307int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
308 unsigned int freq_in, unsigned int freq_out)
309{
310 u8 hppllctl, lppllctl;
311 int ret = 0;
312
313 mutex_lock(&twl6040->mutex);
314
315 hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
316 lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
317
318 switch (pll_id) {
319 case TWL6040_SYSCLK_SEL_LPPLL:
320 /* low-power PLL divider */
321 switch (freq_out) {
322 case 17640000:
323 lppllctl |= TWL6040_LPLLFIN;
324 break;
325 case 19200000:
326 lppllctl &= ~TWL6040_LPLLFIN;
327 break;
328 default:
329 dev_err(&twl6040_dev->dev,
330 "freq_out %d not supported\n", freq_out);
331 ret = -EINVAL;
332 goto pll_out;
333 }
334 twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
335
336 switch (freq_in) {
337 case 32768:
338 lppllctl |= TWL6040_LPLLENA;
339 twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
340 lppllctl);
341 mdelay(5);
342 lppllctl &= ~TWL6040_HPLLSEL;
343 twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
344 lppllctl);
345 hppllctl &= ~TWL6040_HPLLENA;
346 twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
347 hppllctl);
348 break;
349 default:
350 dev_err(&twl6040_dev->dev,
351 "freq_in %d not supported\n", freq_in);
352 ret = -EINVAL;
353 goto pll_out;
354 }
355 break;
356 case TWL6040_SYSCLK_SEL_HPPLL:
357 /* high-performance PLL can provide only 19.2 MHz */
358 if (freq_out != 19200000) {
359 dev_err(&twl6040_dev->dev,
360 "freq_out %d not supported\n", freq_out);
361 ret = -EINVAL;
362 goto pll_out;
363 }
364
365 hppllctl &= ~TWL6040_MCLK_MSK;
366
367 switch (freq_in) {
368 case 12000000:
369 /* PLL enabled, active mode */
370 hppllctl |= TWL6040_MCLK_12000KHZ |
371 TWL6040_HPLLENA;
372 break;
373 case 19200000:
374 /*
375 * PLL disabled
376 * (enable PLL if MCLK jitter quality
377 * doesn't meet specification)
378 */
379 hppllctl |= TWL6040_MCLK_19200KHZ;
380 break;
381 case 26000000:
382 /* PLL enabled, active mode */
383 hppllctl |= TWL6040_MCLK_26000KHZ |
384 TWL6040_HPLLENA;
385 break;
386 case 38400000:
387 /* PLL enabled, active mode */
388 hppllctl |= TWL6040_MCLK_38400KHZ |
389 TWL6040_HPLLENA;
390 break;
391 default:
392 dev_err(&twl6040_dev->dev,
393 "freq_in %d not supported\n", freq_in);
394 ret = -EINVAL;
395 goto pll_out;
396 }
397
398 /* enable clock slicer to ensure input waveform is square */
399 hppllctl |= TWL6040_HPLLSQRENA;
400
401 twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl);
402 usleep_range(500, 700);
403 lppllctl |= TWL6040_HPLLSEL;
404 twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
405 lppllctl &= ~TWL6040_LPLLENA;
406 twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
407 break;
408 default:
409 dev_err(&twl6040_dev->dev, "unknown pll id %d\n", pll_id);
410 ret = -EINVAL;
411 goto pll_out;
412 }
413
414 twl6040->sysclk = freq_out;
415 twl6040->pll = pll_id;
416
417pll_out:
418 mutex_unlock(&twl6040->mutex);
419 return ret;
420}
421EXPORT_SYMBOL(twl6040_set_pll);
422
423int twl6040_get_pll(struct twl6040 *twl6040)
424{
425 if (twl6040->power_count)
426 return twl6040->pll;
427 else
428 return -ENODEV;
429}
430EXPORT_SYMBOL(twl6040_get_pll);
431
432unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
433{
434 return twl6040->sysclk;
435}
436EXPORT_SYMBOL(twl6040_get_sysclk);
437
438static struct resource twl6040_vibra_rsrc[] = {
439 {
440 .flags = IORESOURCE_IRQ,
441 },
442};
443
444static struct resource twl6040_codec_rsrc[] = {
445 {
446 .flags = IORESOURCE_IRQ,
447 },
448};
449
450static int __devinit twl6040_probe(struct platform_device *pdev)
451{
452 struct twl4030_audio_data *pdata = pdev->dev.platform_data;
453 struct twl6040 *twl6040;
454 struct mfd_cell *cell = NULL;
455 int ret, children = 0;
456
457 if (!pdata) {
458 dev_err(&pdev->dev, "Platform data is missing\n");
459 return -EINVAL;
460 }
461
462 /* In order to operate correctly we need valid interrupt config */
463 if (!pdata->naudint_irq || !pdata->irq_base) {
464 dev_err(&pdev->dev, "Invalid IRQ configuration\n");
465 return -EINVAL;
466 }
467
468 twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
469 if (!twl6040)
470 return -ENOMEM;
471
472 platform_set_drvdata(pdev, twl6040);
473
474 twl6040_dev = pdev;
475 twl6040->dev = &pdev->dev;
476 twl6040->audpwron = pdata->audpwron_gpio;
477 twl6040->irq = pdata->naudint_irq;
478 twl6040->irq_base = pdata->irq_base;
479
480 mutex_init(&twl6040->mutex);
481 mutex_init(&twl6040->io_mutex);
482 init_completion(&twl6040->ready);
483
484 twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
485
486 if (gpio_is_valid(twl6040->audpwron)) {
487 ret = gpio_request(twl6040->audpwron, "audpwron");
488 if (ret)
489 goto gpio1_err;
490
491 ret = gpio_direction_output(twl6040->audpwron, 0);
492 if (ret)
493 goto gpio2_err;
494 }
495
496 /* ERRATA: Automatic power-up is not possible in ES1.0 */
497 if (twl6040->rev == TWL6040_REV_ES1_0)
498 twl6040->audpwron = -EINVAL;
499
500 /* codec interrupt */
501 ret = twl6040_irq_init(twl6040);
502 if (ret)
503 goto gpio2_err;
504
505 ret = request_threaded_irq(twl6040->irq_base + TWL6040_IRQ_READY,
506 NULL, twl6040_naudint_handler, 0,
507 "twl6040_irq_ready", twl6040);
508 if (ret) {
509 dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
510 ret);
511 goto irq_err;
512 }
513
514 /* dual-access registers controlled by I2C only */
515 twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);
516
517 if (pdata->codec) {
518 int irq = twl6040->irq_base + TWL6040_IRQ_PLUG;
519
520 cell = &twl6040->cells[children];
521 cell->name = "twl6040-codec";
522 twl6040_codec_rsrc[0].start = irq;
523 twl6040_codec_rsrc[0].end = irq;
524 cell->resources = twl6040_codec_rsrc;
525 cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
526 cell->platform_data = pdata->codec;
527 cell->pdata_size = sizeof(*pdata->codec);
528 children++;
529 }
530
531 if (pdata->vibra) {
532 int irq = twl6040->irq_base + TWL6040_IRQ_VIB;
533
534 cell = &twl6040->cells[children];
535 cell->name = "twl6040-vibra";
536 twl6040_vibra_rsrc[0].start = irq;
537 twl6040_vibra_rsrc[0].end = irq;
538 cell->resources = twl6040_vibra_rsrc;
539 cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc);
540
541 cell->platform_data = pdata->vibra;
542 cell->pdata_size = sizeof(*pdata->vibra);
543 children++;
544 }
545
546 if (children) {
547 ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
548 children, NULL, 0);
549 if (ret)
550 goto mfd_err;
551 } else {
552 dev_err(&pdev->dev, "No platform data found for children\n");
553 ret = -ENODEV;
554 goto mfd_err;
555 }
556
557 return 0;
558
559mfd_err:
560 free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
561irq_err:
562 twl6040_irq_exit(twl6040);
563gpio2_err:
564 if (gpio_is_valid(twl6040->audpwron))
565 gpio_free(twl6040->audpwron);
566gpio1_err:
567 platform_set_drvdata(pdev, NULL);
568 kfree(twl6040);
569 twl6040_dev = NULL;
570 return ret;
571}
572
573static int __devexit twl6040_remove(struct platform_device *pdev)
574{
575 struct twl6040 *twl6040 = platform_get_drvdata(pdev);
576
577 if (twl6040->power_count)
578 twl6040_power(twl6040, 0);
579
580 if (gpio_is_valid(twl6040->audpwron))
581 gpio_free(twl6040->audpwron);
582
583 free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
584 twl6040_irq_exit(twl6040);
585
586 mfd_remove_devices(&pdev->dev);
587 platform_set_drvdata(pdev, NULL);
588 kfree(twl6040);
589 twl6040_dev = NULL;
590
591 return 0;
592}
593
594static struct platform_driver twl6040_driver = {
595 .probe = twl6040_probe,
596 .remove = __devexit_p(twl6040_remove),
597 .driver = {
598 .owner = THIS_MODULE,
599 .name = "twl6040",
600 },
601};
602
603static int __devinit twl6040_init(void)
604{
605 return platform_driver_register(&twl6040_driver);
606}
607module_init(twl6040_init);
608
609static void __devexit twl6040_exit(void)
610{
611 platform_driver_unregister(&twl6040_driver);
612}
613
614module_exit(twl6040_exit);
615
616MODULE_DESCRIPTION("TWL6040 MFD");
617MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
618MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
619MODULE_LICENSE("GPL");
620MODULE_ALIAS("platform:twl6040");