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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_gpio.h>
 34 
 35 #include "tpa6130a2.h"
 36 
 37 enum tpa_model {
 38         TPA6130A2,
 39         TPA6140A2,
 40 };
 41 
 42 static struct i2c_client *tpa6130a2_client;
 43 
 44 /* This struct is used to save the context */
 45 struct tpa6130a2_data {
 46         struct mutex mutex;
 47         unsigned char regs[TPA6130A2_CACHEREGNUM];
 48         struct regulator *supply;
 49         int power_gpio;
 50         u8 power_state:1;
 51         enum tpa_model id;
 52 };
 53 
 54 static int tpa6130a2_i2c_read(int reg)
 55 {
 56         struct tpa6130a2_data *data;
 57         int val;
 58 
 59         if (WARN_ON(!tpa6130a2_client))
 60                 return -EINVAL;
 61         data = i2c_get_clientdata(tpa6130a2_client);
 62 
 63         /* If powered off, return the cached value */
 64         if (data->power_state) {
 65                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
 66                 if (val < 0)
 67                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
 68                 else
 69                         data->regs[reg] = val;
 70         } else {
 71                 val = data->regs[reg];
 72         }
 73 
 74         return val;
 75 }
 76 
 77 static int tpa6130a2_i2c_write(int reg, u8 value)
 78 {
 79         struct tpa6130a2_data *data;
 80         int val = 0;
 81 
 82         if (WARN_ON(!tpa6130a2_client))
 83                 return -EINVAL;
 84         data = i2c_get_clientdata(tpa6130a2_client);
 85 
 86         if (data->power_state) {
 87                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
 88                 if (val < 0) {
 89                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
 90                         return val;
 91                 }
 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         if (WARN_ON(!tpa6130a2_client))
105                 return 0;
106         data = i2c_get_clientdata(tpa6130a2_client);
107 
108         return data->regs[reg];
109 }
110 
111 static int tpa6130a2_initialize(void)
112 {
113         struct tpa6130a2_data *data;
114         int i, ret = 0;
115 
116         if (WARN_ON(!tpa6130a2_client))
117                 return -EINVAL;
118         data = i2c_get_clientdata(tpa6130a2_client);
119 
120         for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
121                 ret = tpa6130a2_i2c_write(i, data->regs[i]);
122                 if (ret < 0)
123                         break;
124         }
125 
126         return ret;
127 }
128 
129 static int tpa6130a2_power(u8 power)
130 {
131         struct  tpa6130a2_data *data;
132         u8      val;
133         int     ret = 0;
134 
135         if (WARN_ON(!tpa6130a2_client))
136                 return -EINVAL;
137         data = i2c_get_clientdata(tpa6130a2_client);
138 
139         mutex_lock(&data->mutex);
140         if (power == data->power_state)
141                 goto exit;
142 
143         if (power) {
144                 ret = regulator_enable(data->supply);
145                 if (ret != 0) {
146                         dev_err(&tpa6130a2_client->dev,
147                                 "Failed to enable supply: %d\n", ret);
148                         goto exit;
149                 }
150                 /* Power on */
151                 if (data->power_gpio >= 0)
152                         gpio_set_value(data->power_gpio, 1);
153 
154                 data->power_state = 1;
155                 ret = tpa6130a2_initialize();
156                 if (ret < 0) {
157                         dev_err(&tpa6130a2_client->dev,
158                                 "Failed to initialize chip\n");
159                         if (data->power_gpio >= 0)
160                                 gpio_set_value(data->power_gpio, 0);
161                         regulator_disable(data->supply);
162                         data->power_state = 0;
163                         goto exit;
164                 }
165         } else {
166                 /* set SWS */
167                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
168                 val |= TPA6130A2_SWS;
169                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
170 
171                 /* Power off */
172                 if (data->power_gpio >= 0)
173                         gpio_set_value(data->power_gpio, 0);
174 
175                 ret = regulator_disable(data->supply);
176                 if (ret != 0) {
177                         dev_err(&tpa6130a2_client->dev,
178                                 "Failed to disable supply: %d\n", ret);
179                         goto exit;
180                 }
181 
182                 data->power_state = 0;
183         }
184 
185 exit:
186         mutex_unlock(&data->mutex);
187         return ret;
188 }
189 
190 static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
191                 struct snd_ctl_elem_value *ucontrol)
192 {
193         struct soc_mixer_control *mc =
194                 (struct soc_mixer_control *)kcontrol->private_value;
195         struct tpa6130a2_data *data;
196         unsigned int reg = mc->reg;
197         unsigned int shift = mc->shift;
198         int max = mc->max;
199         unsigned int mask = (1 << fls(max)) - 1;
200         unsigned int invert = mc->invert;
201 
202         if (WARN_ON(!tpa6130a2_client))
203                 return -EINVAL;
204         data = i2c_get_clientdata(tpa6130a2_client);
205 
206         mutex_lock(&data->mutex);
207 
208         ucontrol->value.integer.value[0] =
209                 (tpa6130a2_read(reg) >> shift) & mask;
210 
211         if (invert)
212                 ucontrol->value.integer.value[0] =
213                         max - ucontrol->value.integer.value[0];
214 
215         mutex_unlock(&data->mutex);
216         return 0;
217 }
218 
219 static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
220                 struct snd_ctl_elem_value *ucontrol)
221 {
222         struct soc_mixer_control *mc =
223                 (struct soc_mixer_control *)kcontrol->private_value;
224         struct tpa6130a2_data *data;
225         unsigned int reg = mc->reg;
226         unsigned int shift = mc->shift;
227         int max = mc->max;
228         unsigned int mask = (1 << fls(max)) - 1;
229         unsigned int invert = mc->invert;
230         unsigned int val = (ucontrol->value.integer.value[0] & mask);
231         unsigned int val_reg;
232 
233         if (WARN_ON(!tpa6130a2_client))
234                 return -EINVAL;
235         data = i2c_get_clientdata(tpa6130a2_client);
236 
237         if (invert)
238                 val = max - val;
239 
240         mutex_lock(&data->mutex);
241 
242         val_reg = tpa6130a2_read(reg);
243         if (((val_reg >> shift) & mask) == val) {
244                 mutex_unlock(&data->mutex);
245                 return 0;
246         }
247 
248         val_reg &= ~(mask << shift);
249         val_reg |= val << shift;
250         tpa6130a2_i2c_write(reg, val_reg);
251 
252         mutex_unlock(&data->mutex);
253 
254         return 1;
255 }
256 
257 /*
258  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
259  * down in gain.
260  */
261 static const unsigned int tpa6130_tlv[] = {
262         TLV_DB_RANGE_HEAD(10),
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 unsigned int tpa6140_tlv[] = {
283         TLV_DB_RANGE_HEAD(3),
284         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
285         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
286         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
287 };
288 
289 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
290         SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
291                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
292                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
293                        tpa6140_tlv),
294 };
295 
296 /*
297  * Enable or disable channel (left or right)
298  * The bit number for mute and amplifier are the same per channel:
299  * bit 6: Right channel
300  * bit 7: Left channel
301  * in both registers.
302  */
303 static void tpa6130a2_channel_enable(u8 channel, int enable)
304 {
305         u8      val;
306 
307         if (enable) {
308                 /* Enable channel */
309                 /* Enable amplifier */
310                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
311                 val |= channel;
312                 val &= ~TPA6130A2_SWS;
313                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
314 
315                 /* Unmute channel */
316                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
317                 val &= ~channel;
318                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
319         } else {
320                 /* Disable channel */
321                 /* Mute channel */
322                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
323                 val |= channel;
324                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
325 
326                 /* Disable amplifier */
327                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
328                 val &= ~channel;
329                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
330         }
331 }
332 
333 int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
334 {
335         int ret = 0;
336         if (enable) {
337                 ret = tpa6130a2_power(1);
338                 if (ret < 0)
339                         return ret;
340                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
341                                          1);
342         } else {
343                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
344                                          0);
345                 ret = tpa6130a2_power(0);
346         }
347 
348         return ret;
349 }
350 EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
351 
352 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
353 {
354         struct  tpa6130a2_data *data;
355 
356         if (tpa6130a2_client == NULL)
357                 return -ENODEV;
358 
359         data = i2c_get_clientdata(tpa6130a2_client);
360 
361         if (data->id == TPA6140A2)
362                 return snd_soc_add_codec_controls(codec, tpa6140a2_controls,
363                                                 ARRAY_SIZE(tpa6140a2_controls));
364         else
365                 return snd_soc_add_codec_controls(codec, tpa6130a2_controls,
366                                                 ARRAY_SIZE(tpa6130a2_controls));
367 }
368 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
369 
370 static int tpa6130a2_probe(struct i2c_client *client,
371                            const struct i2c_device_id *id)
372 {
373         struct device *dev;
374         struct tpa6130a2_data *data;
375         struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
376         struct device_node *np = client->dev.of_node;
377         const char *regulator;
378         int ret;
379 
380         dev = &client->dev;
381 
382         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
383         if (data == NULL) {
384                 dev_err(dev, "Can not allocate memory\n");
385                 return -ENOMEM;
386         }
387 
388         if (pdata) {
389                 data->power_gpio = pdata->power_gpio;
390         } else if (np) {
391                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
392         } else {
393                 dev_err(dev, "Platform data not set\n");
394                 dump_stack();
395                 return -ENODEV;
396         }
397 
398         tpa6130a2_client = client;
399 
400         i2c_set_clientdata(tpa6130a2_client, data);
401 
402         data->id = id->driver_data;
403 
404         mutex_init(&data->mutex);
405 
406         /* Set default register values */
407         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
408         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
409                                                 TPA6130A2_MUTE_L;
410 
411         if (data->power_gpio >= 0) {
412                 ret = devm_gpio_request(dev, data->power_gpio,
413                                         "tpa6130a2 enable");
414                 if (ret < 0) {
415                         dev_err(dev, "Failed to request power GPIO (%d)\n",
416                                 data->power_gpio);
417                         goto err_gpio;
418                 }
419                 gpio_direction_output(data->power_gpio, 0);
420         }
421 
422         switch (data->id) {
423         default:
424                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
425                          data->id);
426         case TPA6130A2:
427                 regulator = "Vdd";
428                 break;
429         case TPA6140A2:
430                 regulator = "AVdd";
431                 break;
432         }
433 
434         data->supply = devm_regulator_get(dev, regulator);
435         if (IS_ERR(data->supply)) {
436                 ret = PTR_ERR(data->supply);
437                 dev_err(dev, "Failed to request supply: %d\n", ret);
438                 goto err_gpio;
439         }
440 
441         ret = tpa6130a2_power(1);
442         if (ret != 0)
443                 goto err_gpio;
444 
445 
446         /* Read version */
447         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
448                                  TPA6130A2_VERSION_MASK;
449         if ((ret != 1) && (ret != 2))
450                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
451 
452         /* Disable the chip */
453         ret = tpa6130a2_power(0);
454         if (ret != 0)
455                 goto err_gpio;
456 
457         return 0;
458 
459 err_gpio:
460         tpa6130a2_client = NULL;
461 
462         return ret;
463 }
464 
465 static int tpa6130a2_remove(struct i2c_client *client)
466 {
467         tpa6130a2_power(0);
468         tpa6130a2_client = NULL;
469 
470         return 0;
471 }
472 
473 static const struct i2c_device_id tpa6130a2_id[] = {
474         { "tpa6130a2", TPA6130A2 },
475         { "tpa6140a2", TPA6140A2 },
476         { }
477 };
478 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
479 
480 #if IS_ENABLED(CONFIG_OF)
481 static const struct of_device_id tpa6130a2_of_match[] = {
482         { .compatible = "ti,tpa6130a2", },
483         { .compatible = "ti,tpa6140a2" },
484         {},
485 };
486 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
487 #endif
488 
489 static struct i2c_driver tpa6130a2_i2c_driver = {
490         .driver = {
491                 .name = "tpa6130a2",
492                 .owner = THIS_MODULE,
493                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
494         },
495         .probe = tpa6130a2_probe,
496         .remove = tpa6130a2_remove,
497         .id_table = tpa6130a2_id,
498 };
499 
500 module_i2c_driver(tpa6130a2_i2c_driver);
501 
502 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
503 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
504 MODULE_LICENSE("GPL");
505 

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