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1 /*
2  * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
3  *
4  * Copyright (C) Nokia Corporation
5  *
6  * Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  */
22
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/device.h>
26 #include <linux/i2c.h>
27 #include <linux/gpio.h>
28 #include <linux/regulator/consumer.h>
29 #include <sound/tpa6130a2-plat.h>
30 #include <sound/soc.h>
31 #include <sound/soc-dapm.h>
32 #include <sound/tlv.h>
33
34 #include "tpa6130a2.h"
35
36 static struct i2c_client *tpa6130a2_client;
37
38 #define TPA6130A2_NUM_SUPPLIES 2
39 static const char *tpa6130a2_supply_names[TPA6130A2_NUM_SUPPLIES] = {
40         "CPVSS",
41         "Vdd",
42 };
43
44 static const char *tpa6140a2_supply_names[TPA6130A2_NUM_SUPPLIES] = {
45         "HPVdd",
46         "AVdd",
47 };
48
49 /* This struct is used to save the context */
50 struct tpa6130a2_data {
51         struct mutex mutex;
52         unsigned char regs[TPA6130A2_CACHEREGNUM];
53         struct regulator_bulk_data supplies[TPA6130A2_NUM_SUPPLIES];
54         int power_gpio;
55         unsigned char power_state;
56 };
57
58 static int tpa6130a2_i2c_read(int reg)
59 {
60         struct tpa6130a2_data *data;
61         int val;
62
63         BUG_ON(tpa6130a2_client == NULL);
64         data = i2c_get_clientdata(tpa6130a2_client);
65
66         /* If powered off, return the cached value */
67         if (data->power_state) {
68                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
69                 if (val < 0)
70                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
71                 else
72                         data->regs[reg] = val;
73         } else {
74                 val = data->regs[reg];
75         }
76
77         return val;
78 }
79
80 static int tpa6130a2_i2c_write(int reg, u8 value)
81 {
82         struct tpa6130a2_data *data;
83         int val = 0;
84
85         BUG_ON(tpa6130a2_client == NULL);
86         data = i2c_get_clientdata(tpa6130a2_client);
87
88         if (data->power_state) {
89                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
90                 if (val < 0)
91                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
92         }
93
94         /* Either powered on or off, we save the context */
95         data->regs[reg] = value;
96
97         return val;
98 }
99
100 static u8 tpa6130a2_read(int reg)
101 {
102         struct tpa6130a2_data *data;
103
104         BUG_ON(tpa6130a2_client == NULL);
105         data = i2c_get_clientdata(tpa6130a2_client);
106
107         return data->regs[reg];
108 }
109
110 static void tpa6130a2_initialize(void)
111 {
112         struct tpa6130a2_data *data;
113         int i;
114
115         BUG_ON(tpa6130a2_client == NULL);
116         data = i2c_get_clientdata(tpa6130a2_client);
117
118         for (i = 1; i < TPA6130A2_REG_VERSION; i++)
119                 tpa6130a2_i2c_write(i, data->regs[i]);
120 }
121
122 static int tpa6130a2_power(int power)
123 {
124         struct  tpa6130a2_data *data;
125         u8      val;
126         int     ret;
127
128         BUG_ON(tpa6130a2_client == NULL);
129         data = i2c_get_clientdata(tpa6130a2_client);
130
131         mutex_lock(&data->mutex);
132         if (power) {
133                 /* Power on */
134                 if (data->power_gpio >= 0)
135                         gpio_set_value(data->power_gpio, 1);
136
137                 ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies),
138                                             data->supplies);
139                 if (ret != 0) {
140                         dev_err(&tpa6130a2_client->dev,
141                                 "Failed to enable supplies: %d\n", ret);
142                         goto exit;
143                 }
144
145                 data->power_state = 1;
146                 tpa6130a2_initialize();
147
148                 /* Clear SWS */
149                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
150                 val &= ~TPA6130A2_SWS;
151                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
152         } else {
153                 /* set SWS */
154                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
155                 val |= TPA6130A2_SWS;
156                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
157
158                 /* Power off */
159                 if (data->power_gpio >= 0)
160                         gpio_set_value(data->power_gpio, 0);
161
162                 ret = regulator_bulk_disable(ARRAY_SIZE(data->supplies),
163                                              data->supplies);
164                 if (ret != 0) {
165                         dev_err(&tpa6130a2_client->dev,
166                                 "Failed to disable supplies: %d\n", ret);
167                         goto exit;
168                 }
169
170                 data->power_state = 0;
171         }
172
173 exit:
174         mutex_unlock(&data->mutex);
175         return ret;
176 }
177
178 static int tpa6130a2_get_reg(struct snd_kcontrol *kcontrol,
179                 struct snd_ctl_elem_value *ucontrol)
180 {
181         struct soc_mixer_control *mc =
182                 (struct soc_mixer_control *)kcontrol->private_value;
183         struct tpa6130a2_data *data;
184         unsigned int reg = mc->reg;
185         unsigned int shift = mc->shift;
186         unsigned int mask = mc->max;
187         unsigned int invert = mc->invert;
188
189         BUG_ON(tpa6130a2_client == NULL);
190         data = i2c_get_clientdata(tpa6130a2_client);
191
192         mutex_lock(&data->mutex);
193
194         ucontrol->value.integer.value[0] =
195                 (tpa6130a2_read(reg) >> shift) & mask;
196
197         if (invert)
198                 ucontrol->value.integer.value[0] =
199                         mask - ucontrol->value.integer.value[0];
200
201         mutex_unlock(&data->mutex);
202         return 0;
203 }
204
205 static int tpa6130a2_set_reg(struct snd_kcontrol *kcontrol,
206                 struct snd_ctl_elem_value *ucontrol)
207 {
208         struct soc_mixer_control *mc =
209                 (struct soc_mixer_control *)kcontrol->private_value;
210         struct tpa6130a2_data *data;
211         unsigned int reg = mc->reg;
212         unsigned int shift = mc->shift;
213         unsigned int mask = mc->max;
214         unsigned int invert = mc->invert;
215         unsigned int val = (ucontrol->value.integer.value[0] & mask);
216         unsigned int val_reg;
217
218         BUG_ON(tpa6130a2_client == NULL);
219         data = i2c_get_clientdata(tpa6130a2_client);
220
221         if (invert)
222                 val = mask - val;
223
224         mutex_lock(&data->mutex);
225
226         val_reg = tpa6130a2_read(reg);
227         if (((val_reg >> shift) & mask) == val) {
228                 mutex_unlock(&data->mutex);
229                 return 0;
230         }
231
232         val_reg &= ~(mask << shift);
233         val_reg |= val << shift;
234         tpa6130a2_i2c_write(reg, val_reg);
235
236         mutex_unlock(&data->mutex);
237
238         return 1;
239 }
240
241 /*
242  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
243  * down in gain.
244  */
245 static const unsigned int tpa6130_tlv[] = {
246         TLV_DB_RANGE_HEAD(10),
247         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
248         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
249         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
250         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
251         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
252         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
253         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
254         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
255         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
256         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
257 };
258
259 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
260         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
261                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
262                        tpa6130a2_get_reg, tpa6130a2_set_reg,
263                        tpa6130_tlv),
264 };
265
266 /*
267  * Enable or disable channel (left or right)
268  * The bit number for mute and amplifier are the same per channel:
269  * bit 6: Right channel
270  * bit 7: Left channel
271  * in both registers.
272  */
273 static void tpa6130a2_channel_enable(u8 channel, int enable)
274 {
275         u8      val;
276
277         if (enable) {
278                 /* Enable channel */
279                 /* Enable amplifier */
280                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
281                 val |= channel;
282                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
283
284                 /* Unmute channel */
285                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
286                 val &= ~channel;
287                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
288         } else {
289                 /* Disable channel */
290                 /* Mute channel */
291                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
292                 val |= channel;
293                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
294
295                 /* Disable amplifier */
296                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
297                 val &= ~channel;
298                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
299         }
300 }
301
302 static int tpa6130a2_left_event(struct snd_soc_dapm_widget *w,
303                 struct snd_kcontrol *kcontrol, int event)
304 {
305         switch (event) {
306         case SND_SOC_DAPM_POST_PMU:
307                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 1);
308                 break;
309         case SND_SOC_DAPM_POST_PMD:
310                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 0);
311                 break;
312         }
313         return 0;
314 }
315
316 static int tpa6130a2_right_event(struct snd_soc_dapm_widget *w,
317                 struct snd_kcontrol *kcontrol, int event)
318 {
319         switch (event) {
320         case SND_SOC_DAPM_POST_PMU:
321                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 1);
322                 break;
323         case SND_SOC_DAPM_POST_PMD:
324                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 0);
325                 break;
326         }
327         return 0;
328 }
329
330 static int tpa6130a2_supply_event(struct snd_soc_dapm_widget *w,
331                 struct snd_kcontrol *kcontrol, int event)
332 {
333         int ret = 0;
334
335         switch (event) {
336         case SND_SOC_DAPM_POST_PMU:
337                 ret = tpa6130a2_power(1);
338                 break;
339         case SND_SOC_DAPM_POST_PMD:
340                 ret = tpa6130a2_power(0);
341                 break;
342         }
343         return ret;
344 }
345
346 static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
347         SND_SOC_DAPM_PGA_E("TPA6130A2 Left", SND_SOC_NOPM,
348                         0, 0, NULL, 0, tpa6130a2_left_event,
349                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
350         SND_SOC_DAPM_PGA_E("TPA6130A2 Right", SND_SOC_NOPM,
351                         0, 0, NULL, 0, tpa6130a2_right_event,
352                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
353         SND_SOC_DAPM_SUPPLY("TPA6130A2 Enable", SND_SOC_NOPM,
354                         0, 0, tpa6130a2_supply_event,
355                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
356         /* Outputs */
357         SND_SOC_DAPM_HP("TPA6130A2 Headphone Left", NULL),
358         SND_SOC_DAPM_HP("TPA6130A2 Headphone Right", NULL),
359 };
360
361 static const struct snd_soc_dapm_route audio_map[] = {
362         {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Left"},
363         {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Right"},
364
365         {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Enable"},
366         {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Enable"},
367 };
368
369 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
370 {
371         snd_soc_dapm_new_controls(codec, tpa6130a2_dapm_widgets,
372                                 ARRAY_SIZE(tpa6130a2_dapm_widgets));
373
374         snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
375
376         return snd_soc_add_controls(codec, tpa6130a2_controls,
377                                 ARRAY_SIZE(tpa6130a2_controls));
378
379 }
380 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
381
382 static int __devinit tpa6130a2_probe(struct i2c_client *client,
383                                      const struct i2c_device_id *id)
384 {
385         struct device *dev;
386         struct tpa6130a2_data *data;
387         struct tpa6130a2_platform_data *pdata;
388         int i, ret;
389
390         dev = &client->dev;
391
392         if (client->dev.platform_data == NULL) {
393                 dev_err(dev, "Platform data not set\n");
394                 dump_stack();
395                 return -ENODEV;
396         }
397
398         data = kzalloc(sizeof(*data), GFP_KERNEL);
399         if (data == NULL) {
400                 dev_err(dev, "Can not allocate memory\n");
401                 return -ENOMEM;
402         }
403
404         tpa6130a2_client = client;
405
406         i2c_set_clientdata(tpa6130a2_client, data);
407
408         pdata = client->dev.platform_data;
409         data->power_gpio = pdata->power_gpio;
410
411         mutex_init(&data->mutex);
412
413         /* Set default register values */
414         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
415         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
416                                                 TPA6130A2_MUTE_L;
417
418         if (data->power_gpio >= 0) {
419                 ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
420                 if (ret < 0) {
421                         dev_err(dev, "Failed to request power GPIO (%d)\n",
422                                 data->power_gpio);
423                         goto err_gpio;
424                 }
425                 gpio_direction_output(data->power_gpio, 0);
426         }
427
428         switch (pdata->id) {
429         case TPA6130A2:
430                 for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
431                         data->supplies[i].supply = tpa6130a2_supply_names[i];
432                 break;
433         case TPA6140A2:
434                 for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
435                         data->supplies[i].supply = tpa6140a2_supply_names[i];;
436                 break;
437         default:
438                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
439                          pdata->id);
440                 for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
441                         data->supplies[i].supply = tpa6130a2_supply_names[i];
442         }
443
444         ret = regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
445                                  data->supplies);
446         if (ret != 0) {
447                 dev_err(dev, "Failed to request supplies: %d\n", ret);
448                 goto err_regulator;
449         }
450
451         ret = tpa6130a2_power(1);
452         if (ret != 0)
453                 goto err_power;
454
455
456         /* Read version */
457         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
458                                  TPA6130A2_VERSION_MASK;
459         if ((ret != 1) && (ret != 2))
460                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
461
462         /* Disable the chip */
463         ret = tpa6130a2_power(0);
464         if (ret != 0)
465                 goto err_power;
466
467         return 0;
468
469 err_power:
470         regulator_bulk_free(ARRAY_SIZE(data->supplies), data->supplies);
471 err_regulator:
472         if (data->power_gpio >= 0)
473                 gpio_free(data->power_gpio);
474 err_gpio:
475         kfree(data);
476         i2c_set_clientdata(tpa6130a2_client, NULL);
477         tpa6130a2_client = NULL;
478
479         return ret;
480 }
481
482 static int __devexit tpa6130a2_remove(struct i2c_client *client)
483 {
484         struct tpa6130a2_data *data = i2c_get_clientdata(client);
485
486         tpa6130a2_power(0);
487
488         if (data->power_gpio >= 0)
489                 gpio_free(data->power_gpio);
490
491         regulator_bulk_free(ARRAY_SIZE(data->supplies), data->supplies);
492
493         kfree(data);
494         tpa6130a2_client = NULL;
495
496         return 0;
497 }
498
499 static const struct i2c_device_id tpa6130a2_id[] = {
500         { "tpa6130a2", 0 },
501         { }
502 };
503 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
504
505 static struct i2c_driver tpa6130a2_i2c_driver = {
506         .driver = {
507                 .name = "tpa6130a2",
508                 .owner = THIS_MODULE,
509         },
510         .probe = tpa6130a2_probe,
511         .remove = __devexit_p(tpa6130a2_remove),
512         .id_table = tpa6130a2_id,
513 };
514
515 static int __init tpa6130a2_init(void)
516 {
517         return i2c_add_driver(&tpa6130a2_i2c_driver);
518 }
519
520 static void __exit tpa6130a2_exit(void)
521 {
522         i2c_del_driver(&tpa6130a2_i2c_driver);
523 }
524
525 MODULE_AUTHOR("Peter Ujfalusi");
526 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
527 MODULE_LICENSE("GPL");
528
529 module_init(tpa6130a2_init);
530 module_exit(tpa6130a2_exit);