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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 #include <linux/regmap.h>
 36 
 37 #include "tpa6130a2.h"
 38 
 39 enum tpa_model {
 40         TPA6130A2,
 41         TPA6140A2,
 42 };
 43 
 44 /* This struct is used to save the context */
 45 struct tpa6130a2_data {
 46         struct device *dev;
 47         struct regmap *regmap;
 48         struct regulator *supply;
 49         int power_gpio;
 50         enum tpa_model id;
 51 };
 52 
 53 static int tpa6130a2_power(struct tpa6130a2_data *data, bool enable)
 54 {
 55         int ret = 0, ret2;
 56 
 57         if (enable) {
 58                 ret = regulator_enable(data->supply);
 59                 if (ret != 0) {
 60                         dev_err(data->dev,
 61                                 "Failed to enable supply: %d\n", ret);
 62                         return ret;
 63                 }
 64                 /* Power on */
 65                 if (data->power_gpio >= 0)
 66                         gpio_set_value(data->power_gpio, 1);
 67 
 68                 /* Sync registers */
 69                 regcache_cache_only(data->regmap, false);
 70                 ret = regcache_sync(data->regmap);
 71                 if (ret != 0) {
 72                         dev_err(data->dev,
 73                                 "Failed to sync registers: %d\n", ret);
 74                         regcache_cache_only(data->regmap, true);
 75                         if (data->power_gpio >= 0)
 76                                 gpio_set_value(data->power_gpio, 0);
 77                         ret2 = regulator_disable(data->supply);
 78                         if (ret2 != 0)
 79                                 dev_err(data->dev,
 80                                         "Failed to disable supply: %d\n", ret2);
 81                         return ret;
 82                 }
 83         } else {
 84                 /* Powered off device does not retain registers. While device
 85                  * is off, any register updates (i.e. volume changes) should
 86                  * happen in cache only.
 87                  */
 88                 regcache_mark_dirty(data->regmap);
 89                 regcache_cache_only(data->regmap, true);
 90 
 91                 /* Power off */
 92                 if (data->power_gpio >= 0)
 93                         gpio_set_value(data->power_gpio, 0);
 94 
 95                 ret = regulator_disable(data->supply);
 96                 if (ret != 0) {
 97                         dev_err(data->dev,
 98                                 "Failed to disable supply: %d\n", ret);
 99                         return ret;
100                 }
101         }
102 
103         return ret;
104 }
105 
106 static int tpa6130a2_power_event(struct snd_soc_dapm_widget *w,
107                                  struct snd_kcontrol *kctrl, int event)
108 {
109         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
110         struct tpa6130a2_data *data = snd_soc_component_get_drvdata(c);
111 
112         if (SND_SOC_DAPM_EVENT_ON(event)) {
113                 /* Before widget power up: turn chip on, sync registers */
114                 return tpa6130a2_power(data, true);
115         } else {
116                 /* After widget power down: turn chip off */
117                 return tpa6130a2_power(data, false);
118         }
119 }
120 
121 /*
122  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
123  * down in gain.
124  */
125 static const DECLARE_TLV_DB_RANGE(tpa6130_tlv,
126         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
127         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
128         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
129         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
130         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
131         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
132         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
133         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
134         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
135         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0)
136 );
137 
138 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
139         SOC_SINGLE_TLV("Headphone Playback Volume",
140                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
141                        tpa6130_tlv),
142 };
143 
144 static const DECLARE_TLV_DB_RANGE(tpa6140_tlv,
145         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
146         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
147         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0)
148 );
149 
150 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
151         SOC_SINGLE_TLV("Headphone Playback Volume",
152                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
153                        tpa6140_tlv),
154 };
155 
156 static int tpa6130a2_component_probe(struct snd_soc_component *component)
157 {
158         struct tpa6130a2_data *data = snd_soc_component_get_drvdata(component);
159 
160         if (data->id == TPA6140A2)
161                 return snd_soc_add_component_controls(component,
162                         tpa6140a2_controls, ARRAY_SIZE(tpa6140a2_controls));
163         else
164                 return snd_soc_add_component_controls(component,
165                         tpa6130a2_controls, ARRAY_SIZE(tpa6130a2_controls));
166 }
167 
168 static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
169         SND_SOC_DAPM_INPUT("LEFTIN"),
170         SND_SOC_DAPM_INPUT("RIGHTIN"),
171         SND_SOC_DAPM_OUTPUT("HPLEFT"),
172         SND_SOC_DAPM_OUTPUT("HPRIGHT"),
173 
174         SND_SOC_DAPM_PGA("Left Mute", TPA6130A2_REG_VOL_MUTE,
175                          TPA6130A2_HP_EN_L_SHIFT, 1, NULL, 0),
176         SND_SOC_DAPM_PGA("Right Mute", TPA6130A2_REG_VOL_MUTE,
177                          TPA6130A2_HP_EN_R_SHIFT, 1, NULL, 0),
178         SND_SOC_DAPM_PGA("Left PGA", TPA6130A2_REG_CONTROL,
179                          TPA6130A2_HP_EN_L_SHIFT, 0, NULL, 0),
180         SND_SOC_DAPM_PGA("Right PGA", TPA6130A2_REG_CONTROL,
181                          TPA6130A2_HP_EN_R_SHIFT, 0, NULL, 0),
182 
183         SND_SOC_DAPM_SUPPLY("Power", TPA6130A2_REG_CONTROL,
184                             TPA6130A2_SWS_SHIFT, 1, tpa6130a2_power_event,
185                             SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
186 };
187 
188 static const struct snd_soc_dapm_route tpa6130a2_dapm_routes[] = {
189         { "Left PGA", NULL, "LEFTIN" },
190         { "Right PGA", NULL, "RIGHTIN" },
191 
192         { "Left Mute", NULL, "Left PGA" },
193         { "Right Mute", NULL, "Right PGA" },
194 
195         { "HPLEFT", NULL, "Left Mute" },
196         { "HPRIGHT", NULL, "Right Mute" },
197 
198         { "Left PGA", NULL, "Power" },
199         { "Right PGA", NULL, "Power" },
200 };
201 
202 static const struct snd_soc_component_driver tpa6130a2_component_driver = {
203         .name = "tpa6130a2",
204         .probe = tpa6130a2_component_probe,
205         .dapm_widgets = tpa6130a2_dapm_widgets,
206         .num_dapm_widgets = ARRAY_SIZE(tpa6130a2_dapm_widgets),
207         .dapm_routes = tpa6130a2_dapm_routes,
208         .num_dapm_routes = ARRAY_SIZE(tpa6130a2_dapm_routes),
209 };
210 
211 static const struct reg_default tpa6130a2_reg_defaults[] = {
212         { TPA6130A2_REG_CONTROL, TPA6130A2_SWS },
213         { TPA6130A2_REG_VOL_MUTE, TPA6130A2_MUTE_R | TPA6130A2_MUTE_L },
214 };
215 
216 static const struct regmap_config tpa6130a2_regmap_config = {
217         .reg_bits = 8,
218         .val_bits = 8,
219         .max_register = TPA6130A2_REG_VERSION,
220         .reg_defaults = tpa6130a2_reg_defaults,
221         .num_reg_defaults = ARRAY_SIZE(tpa6130a2_reg_defaults),
222         .cache_type = REGCACHE_RBTREE,
223 };
224 
225 static int tpa6130a2_probe(struct i2c_client *client,
226                            const struct i2c_device_id *id)
227 {
228         struct device *dev;
229         struct tpa6130a2_data *data;
230         struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
231         struct device_node *np = client->dev.of_node;
232         const char *regulator;
233         unsigned int version;
234         int ret;
235 
236         dev = &client->dev;
237 
238         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
239         if (!data)
240                 return -ENOMEM;
241 
242         data->dev = dev;
243 
244         data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
245         if (IS_ERR(data->regmap))
246                 return PTR_ERR(data->regmap);
247 
248         if (pdata) {
249                 data->power_gpio = pdata->power_gpio;
250         } else if (np) {
251                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
252         } else {
253                 dev_err(dev, "Platform data not set\n");
254                 dump_stack();
255                 return -ENODEV;
256         }
257 
258         i2c_set_clientdata(client, data);
259 
260         data->id = id->driver_data;
261 
262         if (data->power_gpio >= 0) {
263                 ret = devm_gpio_request(dev, data->power_gpio,
264                                         "tpa6130a2 enable");
265                 if (ret < 0) {
266                         dev_err(dev, "Failed to request power GPIO (%d)\n",
267                                 data->power_gpio);
268                         return ret;
269                 }
270                 gpio_direction_output(data->power_gpio, 0);
271         }
272 
273         switch (data->id) {
274         default:
275                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
276                          data->id);
277         case TPA6130A2:
278                 regulator = "Vdd";
279                 break;
280         case TPA6140A2:
281                 regulator = "AVdd";
282                 break;
283         }
284 
285         data->supply = devm_regulator_get(dev, regulator);
286         if (IS_ERR(data->supply)) {
287                 ret = PTR_ERR(data->supply);
288                 dev_err(dev, "Failed to request supply: %d\n", ret);
289                 return ret;
290         }
291 
292         ret = tpa6130a2_power(data, true);
293         if (ret != 0)
294                 return ret;
295 
296 
297         /* Read version */
298         regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
299         version &= TPA6130A2_VERSION_MASK;
300         if ((version != 1) && (version != 2))
301                 dev_warn(dev, "UNTESTED version detected (%d)\n", version);
302 
303         /* Disable the chip */
304         ret = tpa6130a2_power(data, false);
305         if (ret != 0)
306                 return ret;
307 
308         return devm_snd_soc_register_component(&client->dev,
309                         &tpa6130a2_component_driver, NULL, 0);
310 }
311 
312 static const struct i2c_device_id tpa6130a2_id[] = {
313         { "tpa6130a2", TPA6130A2 },
314         { "tpa6140a2", TPA6140A2 },
315         { }
316 };
317 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
318 
319 #if IS_ENABLED(CONFIG_OF)
320 static const struct of_device_id tpa6130a2_of_match[] = {
321         { .compatible = "ti,tpa6130a2", },
322         { .compatible = "ti,tpa6140a2" },
323         {},
324 };
325 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
326 #endif
327 
328 static struct i2c_driver tpa6130a2_i2c_driver = {
329         .driver = {
330                 .name = "tpa6130a2",
331                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
332         },
333         .probe = tpa6130a2_probe,
334         .id_table = tpa6130a2_id,
335 };
336 
337 module_i2c_driver(tpa6130a2_i2c_driver);
338 
339 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
340 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
341 MODULE_LICENSE("GPL");
342 

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