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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 <[email protected]>
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
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
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
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
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 char *regulator;
226         unsigned int version;
227         int ret;
228
229         dev = &client->dev;
230
231         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
232         if (!data)
233                 return -ENOMEM;
234
235         data->dev = dev;
236
237         data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
238         if (IS_ERR(data->regmap))
239                 return PTR_ERR(data->regmap);
240
241         if (pdata) {
242                 data->power_gpio = pdata->power_gpio;
243         } else if (np) {
244                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
245         } else {
246                 dev_err(dev, "Platform data not set\n");
247                 dump_stack();
248                 return -ENODEV;
249         }
250
251         i2c_set_clientdata(client, data);
252
253         data->id = (uintptr_t)i2c_get_match_data(client);
254
255         if (data->power_gpio >= 0) {
256                 ret = devm_gpio_request(dev, data->power_gpio,
257                                         "tpa6130a2 enable");
258                 if (ret < 0) {
259                         dev_err(dev, "Failed to request power GPIO (%d)\n",
260                                 data->power_gpio);
261                         return ret;
262                 }
263                 gpio_direction_output(data->power_gpio, 0);
264         }
265
266         switch (data->id) {
267         default:
268                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
269                          data->id);
270                 fallthrough;
271         case TPA6130A2:
272                 regulator = "Vdd";
273                 break;
274         case TPA6140A2:
275                 regulator = "AVdd";
276                 break;
277         }
278
279         data->supply = devm_regulator_get(dev, regulator);
280         if (IS_ERR(data->supply)) {
281                 ret = PTR_ERR(data->supply);
282                 dev_err(dev, "Failed to request supply: %d\n", ret);
283                 return ret;
284         }
285
286         ret = tpa6130a2_power(data, true);
287         if (ret != 0)
288                 return ret;
289
290
291         /* Read version */
292         regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
293         version &= TPA6130A2_VERSION_MASK;
294         if ((version != 1) && (version != 2))
295                 dev_warn(dev, "UNTESTED version detected (%d)\n", version);
296
297         /* Disable the chip */
298         ret = tpa6130a2_power(data, false);
299         if (ret != 0)
300                 return ret;
301
302         return devm_snd_soc_register_component(&client->dev,
303                         &tpa6130a2_component_driver, NULL, 0);
304 }
305
306 #if IS_ENABLED(CONFIG_OF)
307 static const struct of_device_id tpa6130a2_of_match[] = {
308         { .compatible = "ti,tpa6130a2", },
309         { .compatible = "ti,tpa6140a2" },
310         {},
311 };
312 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
313 #endif
314
315 static struct i2c_driver tpa6130a2_i2c_driver = {
316         .driver = {
317                 .name = "tpa6130a2",
318                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
319         },
320         .probe = tpa6130a2_probe,
321         .id_table = tpa6130a2_id,
322 };
323
324 module_i2c_driver(tpa6130a2_i2c_driver);
325
326 MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
327 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
328 MODULE_LICENSE("GPL");
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