1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
4 *
5 * Copyright (C) Nokia Corporation
6 *
7 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/errno.h>
12 #include <linux/device.h>
13 #include <linux/i2c.h>
14 #include <linux/gpio.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/slab.h>
17 #include <sound/tpa6130a2-plat.h>
18 #include <sound/soc.h>
19 #include <sound/tlv.h>
20 #include <linux/of.h>
21 #include <linux/of_gpio.h>
22 #include <linux/regmap.h>
23
24 #include "tpa6130a2.h"
25
26 enum tpa_model {
27 TPA6130A2,
28 TPA6140A2,
29 };
30
31 /* This struct is used to save the context */
32 struct tpa6130a2_data {
33 struct device *dev;
34 struct regmap *regmap;
35 struct regulator *supply;
36 int power_gpio;
37 enum tpa_model id;
38 };
39
tpa6130a2_power(struct tpa6130a2_data * data,bool enable)40 static int tpa6130a2_power(struct tpa6130a2_data *data, bool enable)
41 {
42 int ret = 0, ret2;
43
44 if (enable) {
45 ret = regulator_enable(data->supply);
46 if (ret != 0) {
47 dev_err(data->dev,
48 "Failed to enable supply: %d\n", ret);
49 return ret;
50 }
51 /* Power on */
52 if (data->power_gpio >= 0)
53 gpio_set_value(data->power_gpio, 1);
54
55 /* Sync registers */
56 regcache_cache_only(data->regmap, false);
57 ret = regcache_sync(data->regmap);
58 if (ret != 0) {
59 dev_err(data->dev,
60 "Failed to sync registers: %d\n", ret);
61 regcache_cache_only(data->regmap, true);
62 if (data->power_gpio >= 0)
63 gpio_set_value(data->power_gpio, 0);
64 ret2 = regulator_disable(data->supply);
65 if (ret2 != 0)
66 dev_err(data->dev,
67 "Failed to disable supply: %d\n", ret2);
68 return ret;
69 }
70 } else {
71 /* Powered off device does not retain registers. While device
72 * is off, any register updates (i.e. volume changes) should
73 * happen in cache only.
74 */
75 regcache_mark_dirty(data->regmap);
76 regcache_cache_only(data->regmap, true);
77
78 /* Power off */
79 if (data->power_gpio >= 0)
80 gpio_set_value(data->power_gpio, 0);
81
82 ret = regulator_disable(data->supply);
83 if (ret != 0) {
84 dev_err(data->dev,
85 "Failed to disable supply: %d\n", ret);
86 return ret;
87 }
88 }
89
90 return ret;
91 }
92
tpa6130a2_power_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kctrl,int event)93 static int tpa6130a2_power_event(struct snd_soc_dapm_widget *w,
94 struct snd_kcontrol *kctrl, int event)
95 {
96 struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
97 struct tpa6130a2_data *data = snd_soc_component_get_drvdata(c);
98
99 if (SND_SOC_DAPM_EVENT_ON(event)) {
100 /* Before widget power up: turn chip on, sync registers */
101 return tpa6130a2_power(data, true);
102 } else {
103 /* After widget power down: turn chip off */
104 return tpa6130a2_power(data, false);
105 }
106 }
107
108 /*
109 * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
110 * down in gain.
111 */
112 static const DECLARE_TLV_DB_RANGE(tpa6130_tlv,
113 0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
114 2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
115 4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
116 6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
117 8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
118 10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
119 12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
120 14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
121 21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
122 38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0)
123 );
124
125 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
126 SOC_SINGLE_TLV("Headphone Playback Volume",
127 TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
128 tpa6130_tlv),
129 };
130
131 static const DECLARE_TLV_DB_RANGE(tpa6140_tlv,
132 0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
133 9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
134 17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0)
135 );
136
137 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
138 SOC_SINGLE_TLV("Headphone Playback Volume",
139 TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
140 tpa6140_tlv),
141 };
142
tpa6130a2_component_probe(struct snd_soc_component * component)143 static int tpa6130a2_component_probe(struct snd_soc_component *component)
144 {
145 struct tpa6130a2_data *data = snd_soc_component_get_drvdata(component);
146
147 if (data->id == TPA6140A2)
148 return snd_soc_add_component_controls(component,
149 tpa6140a2_controls, ARRAY_SIZE(tpa6140a2_controls));
150 else
151 return snd_soc_add_component_controls(component,
152 tpa6130a2_controls, ARRAY_SIZE(tpa6130a2_controls));
153 }
154
155 static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
156 SND_SOC_DAPM_INPUT("LEFTIN"),
157 SND_SOC_DAPM_INPUT("RIGHTIN"),
158 SND_SOC_DAPM_OUTPUT("HPLEFT"),
159 SND_SOC_DAPM_OUTPUT("HPRIGHT"),
160
161 SND_SOC_DAPM_PGA("Left Mute", TPA6130A2_REG_VOL_MUTE,
162 TPA6130A2_HP_EN_L_SHIFT, 1, NULL, 0),
163 SND_SOC_DAPM_PGA("Right Mute", TPA6130A2_REG_VOL_MUTE,
164 TPA6130A2_HP_EN_R_SHIFT, 1, NULL, 0),
165 SND_SOC_DAPM_PGA("Left PGA", TPA6130A2_REG_CONTROL,
166 TPA6130A2_HP_EN_L_SHIFT, 0, NULL, 0),
167 SND_SOC_DAPM_PGA("Right PGA", TPA6130A2_REG_CONTROL,
168 TPA6130A2_HP_EN_R_SHIFT, 0, NULL, 0),
169
170 SND_SOC_DAPM_SUPPLY("Power", TPA6130A2_REG_CONTROL,
171 TPA6130A2_SWS_SHIFT, 1, tpa6130a2_power_event,
172 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
173 };
174
175 static const struct snd_soc_dapm_route tpa6130a2_dapm_routes[] = {
176 { "Left PGA", NULL, "LEFTIN" },
177 { "Right PGA", NULL, "RIGHTIN" },
178
179 { "Left Mute", NULL, "Left PGA" },
180 { "Right Mute", NULL, "Right PGA" },
181
182 { "HPLEFT", NULL, "Left Mute" },
183 { "HPRIGHT", NULL, "Right Mute" },
184
185 { "Left PGA", NULL, "Power" },
186 { "Right PGA", NULL, "Power" },
187 };
188
189 static const struct snd_soc_component_driver tpa6130a2_component_driver = {
190 .name = "tpa6130a2",
191 .probe = tpa6130a2_component_probe,
192 .dapm_widgets = tpa6130a2_dapm_widgets,
193 .num_dapm_widgets = ARRAY_SIZE(tpa6130a2_dapm_widgets),
194 .dapm_routes = tpa6130a2_dapm_routes,
195 .num_dapm_routes = ARRAY_SIZE(tpa6130a2_dapm_routes),
196 };
197
198 static const struct reg_default tpa6130a2_reg_defaults[] = {
199 { TPA6130A2_REG_CONTROL, TPA6130A2_SWS },
200 { TPA6130A2_REG_VOL_MUTE, TPA6130A2_MUTE_R | TPA6130A2_MUTE_L },
201 };
202
203 static const struct regmap_config tpa6130a2_regmap_config = {
204 .reg_bits = 8,
205 .val_bits = 8,
206 .max_register = TPA6130A2_REG_VERSION,
207 .reg_defaults = tpa6130a2_reg_defaults,
208 .num_reg_defaults = ARRAY_SIZE(tpa6130a2_reg_defaults),
209 .cache_type = REGCACHE_RBTREE,
210 };
211
212 static const struct i2c_device_id tpa6130a2_id[] = {
213 { "tpa6130a2", TPA6130A2 },
214 { "tpa6140a2", TPA6140A2 },
215 { }
216 };
217 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
218
tpa6130a2_probe(struct i2c_client * client)219 static int tpa6130a2_probe(struct i2c_client *client)
220 {
221 struct device *dev;
222 struct tpa6130a2_data *data;
223 struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
224 struct device_node *np = client->dev.of_node;
225 const struct i2c_device_id *id;
226 const char *regulator;
227 unsigned int version;
228 int ret;
229
230 dev = &client->dev;
231
232 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
233 if (!data)
234 return -ENOMEM;
235
236 data->dev = dev;
237
238 data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
239 if (IS_ERR(data->regmap))
240 return PTR_ERR(data->regmap);
241
242 if (pdata) {
243 data->power_gpio = pdata->power_gpio;
244 } else if (np) {
245 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
246 } else {
247 dev_err(dev, "Platform data not set\n");
248 dump_stack();
249 return -ENODEV;
250 }
251
252 i2c_set_clientdata(client, data);
253
254 id = i2c_match_id(tpa6130a2_id, client);
255 data->id = id->driver_data;
256
257 if (data->power_gpio >= 0) {
258 ret = devm_gpio_request(dev, data->power_gpio,
259 "tpa6130a2 enable");
260 if (ret < 0) {
261 dev_err(dev, "Failed to request power GPIO (%d)\n",
262 data->power_gpio);
263 return ret;
264 }
265 gpio_direction_output(data->power_gpio, 0);
266 }
267
268 switch (data->id) {
269 default:
270 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
271 data->id);
272 fallthrough;
273 case TPA6130A2:
274 regulator = "Vdd";
275 break;
276 case TPA6140A2:
277 regulator = "AVdd";
278 break;
279 }
280
281 data->supply = devm_regulator_get(dev, regulator);
282 if (IS_ERR(data->supply)) {
283 ret = PTR_ERR(data->supply);
284 dev_err(dev, "Failed to request supply: %d\n", ret);
285 return ret;
286 }
287
288 ret = tpa6130a2_power(data, true);
289 if (ret != 0)
290 return ret;
291
292
293 /* Read version */
294 regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
295 version &= TPA6130A2_VERSION_MASK;
296 if ((version != 1) && (version != 2))
297 dev_warn(dev, "UNTESTED version detected (%d)\n", version);
298
299 /* Disable the chip */
300 ret = tpa6130a2_power(data, false);
301 if (ret != 0)
302 return ret;
303
304 return devm_snd_soc_register_component(&client->dev,
305 &tpa6130a2_component_driver, NULL, 0);
306 }
307
308 #if IS_ENABLED(CONFIG_OF)
309 static const struct of_device_id tpa6130a2_of_match[] = {
310 { .compatible = "ti,tpa6130a2", },
311 { .compatible = "ti,tpa6140a2" },
312 {},
313 };
314 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
315 #endif
316
317 static struct i2c_driver tpa6130a2_i2c_driver = {
318 .driver = {
319 .name = "tpa6130a2",
320 .of_match_table = of_match_ptr(tpa6130a2_of_match),
321 },
322 .probe = tpa6130a2_probe,
323 .id_table = tpa6130a2_id,
324 };
325
326 module_i2c_driver(tpa6130a2_i2c_driver);
327
328 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
329 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
330 MODULE_LICENSE("GPL");
331