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Linux/sound/soc/codecs/tpa6130a2.c

  1 /*
  2  * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
  3  *
  4  * Copyright (C) Nokia Corporation
  5  *
  6  * Author: Peter Ujfalusi <peter.ujfalusi@ti.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 <linux/slab.h>
 30 #include <sound/tpa6130a2-plat.h>
 31 #include <sound/soc.h>
 32 #include <sound/tlv.h>
 33 #include <linux/of.h>
 34 #include <linux/of_gpio.h>
 35 
 36 #include "tpa6130a2.h"
 37 
 38 enum tpa_model {
 39         TPA6130A2,
 40         TPA6140A2,
 41 };
 42 
 43 static struct i2c_client *tpa6130a2_client;
 44 
 45 /* This struct is used to save the context */
 46 struct tpa6130a2_data {
 47         struct mutex mutex;
 48         unsigned char regs[TPA6130A2_CACHEREGNUM];
 49         struct regulator *supply;
 50         int power_gpio;
 51         u8 power_state:1;
 52         enum tpa_model id;
 53 };
 54 
 55 static int tpa6130a2_i2c_read(int reg)
 56 {
 57         struct tpa6130a2_data *data;
 58         int val;
 59 
 60         if (WARN_ON(!tpa6130a2_client))
 61                 return -EINVAL;
 62         data = i2c_get_clientdata(tpa6130a2_client);
 63 
 64         /* If powered off, return the cached value */
 65         if (data->power_state) {
 66                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
 67                 if (val < 0)
 68                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
 69                 else
 70                         data->regs[reg] = val;
 71         } else {
 72                 val = data->regs[reg];
 73         }
 74 
 75         return val;
 76 }
 77 
 78 static int tpa6130a2_i2c_write(int reg, u8 value)
 79 {
 80         struct tpa6130a2_data *data;
 81         int val = 0;
 82 
 83         if (WARN_ON(!tpa6130a2_client))
 84                 return -EINVAL;
 85         data = i2c_get_clientdata(tpa6130a2_client);
 86 
 87         if (data->power_state) {
 88                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
 89                 if (val < 0) {
 90                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
 91                         return val;
 92                 }
 93         }
 94 
 95         /* Either powered on or off, we save the context */
 96         data->regs[reg] = value;
 97 
 98         return val;
 99 }
100 
101 static u8 tpa6130a2_read(int reg)
102 {
103         struct tpa6130a2_data *data;
104 
105         if (WARN_ON(!tpa6130a2_client))
106                 return 0;
107         data = i2c_get_clientdata(tpa6130a2_client);
108 
109         return data->regs[reg];
110 }
111 
112 static int tpa6130a2_initialize(void)
113 {
114         struct tpa6130a2_data *data;
115         int i, ret = 0;
116 
117         if (WARN_ON(!tpa6130a2_client))
118                 return -EINVAL;
119         data = i2c_get_clientdata(tpa6130a2_client);
120 
121         for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
122                 ret = tpa6130a2_i2c_write(i, data->regs[i]);
123                 if (ret < 0)
124                         break;
125         }
126 
127         return ret;
128 }
129 
130 static int tpa6130a2_power(u8 power)
131 {
132         struct  tpa6130a2_data *data;
133         u8      val;
134         int     ret = 0;
135 
136         if (WARN_ON(!tpa6130a2_client))
137                 return -EINVAL;
138         data = i2c_get_clientdata(tpa6130a2_client);
139 
140         mutex_lock(&data->mutex);
141         if (power == data->power_state)
142                 goto exit;
143 
144         if (power) {
145                 ret = regulator_enable(data->supply);
146                 if (ret != 0) {
147                         dev_err(&tpa6130a2_client->dev,
148                                 "Failed to enable supply: %d\n", ret);
149                         goto exit;
150                 }
151                 /* Power on */
152                 if (data->power_gpio >= 0)
153                         gpio_set_value(data->power_gpio, 1);
154 
155                 data->power_state = 1;
156                 ret = tpa6130a2_initialize();
157                 if (ret < 0) {
158                         dev_err(&tpa6130a2_client->dev,
159                                 "Failed to initialize chip\n");
160                         if (data->power_gpio >= 0)
161                                 gpio_set_value(data->power_gpio, 0);
162                         regulator_disable(data->supply);
163                         data->power_state = 0;
164                         goto exit;
165                 }
166         } else {
167                 /* set SWS */
168                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
169                 val |= TPA6130A2_SWS;
170                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
171 
172                 /* Power off */
173                 if (data->power_gpio >= 0)
174                         gpio_set_value(data->power_gpio, 0);
175 
176                 ret = regulator_disable(data->supply);
177                 if (ret != 0) {
178                         dev_err(&tpa6130a2_client->dev,
179                                 "Failed to disable supply: %d\n", ret);
180                         goto exit;
181                 }
182 
183                 data->power_state = 0;
184         }
185 
186 exit:
187         mutex_unlock(&data->mutex);
188         return ret;
189 }
190 
191 static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
192                 struct snd_ctl_elem_value *ucontrol)
193 {
194         struct soc_mixer_control *mc =
195                 (struct soc_mixer_control *)kcontrol->private_value;
196         struct tpa6130a2_data *data;
197         unsigned int reg = mc->reg;
198         unsigned int shift = mc->shift;
199         int max = mc->max;
200         unsigned int mask = (1 << fls(max)) - 1;
201         unsigned int invert = mc->invert;
202 
203         if (WARN_ON(!tpa6130a2_client))
204                 return -EINVAL;
205         data = i2c_get_clientdata(tpa6130a2_client);
206 
207         mutex_lock(&data->mutex);
208 
209         ucontrol->value.integer.value[0] =
210                 (tpa6130a2_read(reg) >> shift) & mask;
211 
212         if (invert)
213                 ucontrol->value.integer.value[0] =
214                         max - ucontrol->value.integer.value[0];
215 
216         mutex_unlock(&data->mutex);
217         return 0;
218 }
219 
220 static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
221                 struct snd_ctl_elem_value *ucontrol)
222 {
223         struct soc_mixer_control *mc =
224                 (struct soc_mixer_control *)kcontrol->private_value;
225         struct tpa6130a2_data *data;
226         unsigned int reg = mc->reg;
227         unsigned int shift = mc->shift;
228         int max = mc->max;
229         unsigned int mask = (1 << fls(max)) - 1;
230         unsigned int invert = mc->invert;
231         unsigned int val = (ucontrol->value.integer.value[0] & mask);
232         unsigned int val_reg;
233 
234         if (WARN_ON(!tpa6130a2_client))
235                 return -EINVAL;
236         data = i2c_get_clientdata(tpa6130a2_client);
237 
238         if (invert)
239                 val = max - val;
240 
241         mutex_lock(&data->mutex);
242 
243         val_reg = tpa6130a2_read(reg);
244         if (((val_reg >> shift) & mask) == val) {
245                 mutex_unlock(&data->mutex);
246                 return 0;
247         }
248 
249         val_reg &= ~(mask << shift);
250         val_reg |= val << shift;
251         tpa6130a2_i2c_write(reg, val_reg);
252 
253         mutex_unlock(&data->mutex);
254 
255         return 1;
256 }
257 
258 /*
259  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
260  * down in gain.
261  */
262 static const DECLARE_TLV_DB_RANGE(tpa6130_tlv,
263         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
264         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
265         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
266         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
267         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
268         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
269         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
270         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
271         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
272         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0)
273 );
274 
275 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
276         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
277                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
278                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
279                        tpa6130_tlv),
280 };
281 
282 static const DECLARE_TLV_DB_RANGE(tpa6140_tlv,
283         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
284         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
285         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0)
286 );
287 
288 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
289         SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
290                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
291                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
292                        tpa6140_tlv),
293 };
294 
295 /*
296  * Enable or disable channel (left or right)
297  * The bit number for mute and amplifier are the same per channel:
298  * bit 6: Right channel
299  * bit 7: Left channel
300  * in both registers.
301  */
302 static void tpa6130a2_channel_enable(u8 channel, int enable)
303 {
304         u8      val;
305 
306         if (enable) {
307                 /* Enable channel */
308                 /* Enable amplifier */
309                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
310                 val |= channel;
311                 val &= ~TPA6130A2_SWS;
312                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
313 
314                 /* Unmute channel */
315                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
316                 val &= ~channel;
317                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
318         } else {
319                 /* Disable channel */
320                 /* Mute channel */
321                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
322                 val |= channel;
323                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
324 
325                 /* Disable amplifier */
326                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
327                 val &= ~channel;
328                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
329         }
330 }
331 
332 int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
333 {
334         int ret = 0;
335         if (enable) {
336                 ret = tpa6130a2_power(1);
337                 if (ret < 0)
338                         return ret;
339                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
340                                          1);
341         } else {
342                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
343                                          0);
344                 ret = tpa6130a2_power(0);
345         }
346 
347         return ret;
348 }
349 EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
350 
351 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
352 {
353         struct  tpa6130a2_data *data;
354 
355         if (tpa6130a2_client == NULL)
356                 return -ENODEV;
357 
358         data = i2c_get_clientdata(tpa6130a2_client);
359 
360         if (data->id == TPA6140A2)
361                 return snd_soc_add_codec_controls(codec, tpa6140a2_controls,
362                                                 ARRAY_SIZE(tpa6140a2_controls));
363         else
364                 return snd_soc_add_codec_controls(codec, tpa6130a2_controls,
365                                                 ARRAY_SIZE(tpa6130a2_controls));
366 }
367 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
368 
369 static int tpa6130a2_probe(struct i2c_client *client,
370                            const struct i2c_device_id *id)
371 {
372         struct device *dev;
373         struct tpa6130a2_data *data;
374         struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
375         struct device_node *np = client->dev.of_node;
376         const char *regulator;
377         int ret;
378 
379         dev = &client->dev;
380 
381         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
382         if (!data)
383                 return -ENOMEM;
384 
385         if (pdata) {
386                 data->power_gpio = pdata->power_gpio;
387         } else if (np) {
388                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
389         } else {
390                 dev_err(dev, "Platform data not set\n");
391                 dump_stack();
392                 return -ENODEV;
393         }
394 
395         tpa6130a2_client = client;
396 
397         i2c_set_clientdata(tpa6130a2_client, data);
398 
399         data->id = id->driver_data;
400 
401         mutex_init(&data->mutex);
402 
403         /* Set default register values */
404         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
405         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
406                                                 TPA6130A2_MUTE_L;
407 
408         if (data->power_gpio >= 0) {
409                 ret = devm_gpio_request(dev, data->power_gpio,
410                                         "tpa6130a2 enable");
411                 if (ret < 0) {
412                         dev_err(dev, "Failed to request power GPIO (%d)\n",
413                                 data->power_gpio);
414                         goto err_gpio;
415                 }
416                 gpio_direction_output(data->power_gpio, 0);
417         }
418 
419         switch (data->id) {
420         default:
421                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
422                          data->id);
423         case TPA6130A2:
424                 regulator = "Vdd";
425                 break;
426         case TPA6140A2:
427                 regulator = "AVdd";
428                 break;
429         }
430 
431         data->supply = devm_regulator_get(dev, regulator);
432         if (IS_ERR(data->supply)) {
433                 ret = PTR_ERR(data->supply);
434                 dev_err(dev, "Failed to request supply: %d\n", ret);
435                 goto err_gpio;
436         }
437 
438         ret = tpa6130a2_power(1);
439         if (ret != 0)
440                 goto err_gpio;
441 
442 
443         /* Read version */
444         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
445                                  TPA6130A2_VERSION_MASK;
446         if ((ret != 1) && (ret != 2))
447                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
448 
449         /* Disable the chip */
450         ret = tpa6130a2_power(0);
451         if (ret != 0)
452                 goto err_gpio;
453 
454         return 0;
455 
456 err_gpio:
457         tpa6130a2_client = NULL;
458 
459         return ret;
460 }
461 
462 static int tpa6130a2_remove(struct i2c_client *client)
463 {
464         tpa6130a2_power(0);
465         tpa6130a2_client = NULL;
466 
467         return 0;
468 }
469 
470 static const struct i2c_device_id tpa6130a2_id[] = {
471         { "tpa6130a2", TPA6130A2 },
472         { "tpa6140a2", TPA6140A2 },
473         { }
474 };
475 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
476 
477 #if IS_ENABLED(CONFIG_OF)
478 static const struct of_device_id tpa6130a2_of_match[] = {
479         { .compatible = "ti,tpa6130a2", },
480         { .compatible = "ti,tpa6140a2" },
481         {},
482 };
483 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
484 #endif
485 
486 static struct i2c_driver tpa6130a2_i2c_driver = {
487         .driver = {
488                 .name = "tpa6130a2",
489                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
490         },
491         .probe = tpa6130a2_probe,
492         .remove = tpa6130a2_remove,
493         .id_table = tpa6130a2_id,
494 };
495 
496 module_i2c_driver(tpa6130a2_i2c_driver);
497 
498 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
499 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
500 MODULE_LICENSE("GPL");
501 

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