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

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