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493b67ef PU |
1 | /* |
2 | * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver | |
3 | * | |
4 | * Copyright (C) Nokia Corporation | |
5 | * | |
6 | * Author: Peter Ujfalusi <peter.ujfalusi@nokia.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 <sound/tpa6130a2-plat.h> | |
29 | #include <sound/soc.h> | |
30 | #include <sound/soc-dapm.h> | |
31 | #include <sound/tlv.h> | |
32 | ||
33 | #include "tpa6130a2.h" | |
34 | ||
ebab1b1d | 35 | static struct i2c_client *tpa6130a2_client; |
493b67ef PU |
36 | |
37 | /* This struct is used to save the context */ | |
38 | struct tpa6130a2_data { | |
39 | struct mutex mutex; | |
40 | unsigned char regs[TPA6130A2_CACHEREGNUM]; | |
41 | int power_gpio; | |
42 | unsigned char power_state; | |
43 | }; | |
44 | ||
45 | static int tpa6130a2_i2c_read(int reg) | |
46 | { | |
47 | struct tpa6130a2_data *data; | |
48 | int val; | |
49 | ||
50 | BUG_ON(tpa6130a2_client == NULL); | |
51 | data = i2c_get_clientdata(tpa6130a2_client); | |
52 | ||
53 | /* If powered off, return the cached value */ | |
54 | if (data->power_state) { | |
55 | val = i2c_smbus_read_byte_data(tpa6130a2_client, reg); | |
56 | if (val < 0) | |
57 | dev_err(&tpa6130a2_client->dev, "Read failed\n"); | |
58 | else | |
59 | data->regs[reg] = val; | |
60 | } else { | |
61 | val = data->regs[reg]; | |
62 | } | |
63 | ||
64 | return val; | |
65 | } | |
66 | ||
67 | static int tpa6130a2_i2c_write(int reg, u8 value) | |
68 | { | |
69 | struct tpa6130a2_data *data; | |
70 | int val = 0; | |
71 | ||
72 | BUG_ON(tpa6130a2_client == NULL); | |
73 | data = i2c_get_clientdata(tpa6130a2_client); | |
74 | ||
75 | if (data->power_state) { | |
76 | val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value); | |
77 | if (val < 0) | |
78 | dev_err(&tpa6130a2_client->dev, "Write failed\n"); | |
79 | } | |
80 | ||
81 | /* Either powered on or off, we save the context */ | |
82 | data->regs[reg] = value; | |
83 | ||
84 | return val; | |
85 | } | |
86 | ||
87 | static u8 tpa6130a2_read(int reg) | |
88 | { | |
89 | struct tpa6130a2_data *data; | |
90 | ||
91 | BUG_ON(tpa6130a2_client == NULL); | |
92 | data = i2c_get_clientdata(tpa6130a2_client); | |
93 | ||
94 | return data->regs[reg]; | |
95 | } | |
96 | ||
97 | static void tpa6130a2_initialize(void) | |
98 | { | |
99 | struct tpa6130a2_data *data; | |
100 | int i; | |
101 | ||
102 | BUG_ON(tpa6130a2_client == NULL); | |
103 | data = i2c_get_clientdata(tpa6130a2_client); | |
104 | ||
105 | for (i = 1; i < TPA6130A2_REG_VERSION; i++) | |
106 | tpa6130a2_i2c_write(i, data->regs[i]); | |
107 | } | |
108 | ||
814b7963 | 109 | static void tpa6130a2_power(int power) |
493b67ef PU |
110 | { |
111 | struct tpa6130a2_data *data; | |
112 | u8 val; | |
113 | ||
114 | BUG_ON(tpa6130a2_client == NULL); | |
115 | data = i2c_get_clientdata(tpa6130a2_client); | |
116 | ||
117 | mutex_lock(&data->mutex); | |
118 | if (power) { | |
119 | /* Power on */ | |
120 | if (data->power_gpio >= 0) { | |
121 | gpio_set_value(data->power_gpio, 1); | |
122 | data->power_state = 1; | |
123 | tpa6130a2_initialize(); | |
124 | } | |
125 | /* Clear SWS */ | |
126 | val = tpa6130a2_read(TPA6130A2_REG_CONTROL); | |
127 | val &= ~TPA6130A2_SWS; | |
128 | tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val); | |
129 | } else { | |
130 | /* set SWS */ | |
131 | val = tpa6130a2_read(TPA6130A2_REG_CONTROL); | |
132 | val |= TPA6130A2_SWS; | |
133 | tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val); | |
134 | /* Power off */ | |
135 | if (data->power_gpio >= 0) { | |
136 | gpio_set_value(data->power_gpio, 0); | |
137 | data->power_state = 0; | |
138 | } | |
139 | } | |
140 | mutex_unlock(&data->mutex); | |
141 | } | |
142 | ||
143 | static int tpa6130a2_get_reg(struct snd_kcontrol *kcontrol, | |
144 | struct snd_ctl_elem_value *ucontrol) | |
145 | { | |
146 | struct soc_mixer_control *mc = | |
147 | (struct soc_mixer_control *)kcontrol->private_value; | |
148 | struct tpa6130a2_data *data; | |
149 | unsigned int reg = mc->reg; | |
150 | unsigned int shift = mc->shift; | |
151 | unsigned int mask = mc->max; | |
152 | unsigned int invert = mc->invert; | |
153 | ||
154 | BUG_ON(tpa6130a2_client == NULL); | |
155 | data = i2c_get_clientdata(tpa6130a2_client); | |
156 | ||
157 | mutex_lock(&data->mutex); | |
158 | ||
159 | ucontrol->value.integer.value[0] = | |
160 | (tpa6130a2_read(reg) >> shift) & mask; | |
161 | ||
162 | if (invert) | |
163 | ucontrol->value.integer.value[0] = | |
164 | mask - ucontrol->value.integer.value[0]; | |
165 | ||
166 | mutex_unlock(&data->mutex); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int tpa6130a2_set_reg(struct snd_kcontrol *kcontrol, | |
171 | struct snd_ctl_elem_value *ucontrol) | |
172 | { | |
173 | struct soc_mixer_control *mc = | |
174 | (struct soc_mixer_control *)kcontrol->private_value; | |
175 | struct tpa6130a2_data *data; | |
176 | unsigned int reg = mc->reg; | |
177 | unsigned int shift = mc->shift; | |
178 | unsigned int mask = mc->max; | |
179 | unsigned int invert = mc->invert; | |
180 | unsigned int val = (ucontrol->value.integer.value[0] & mask); | |
181 | unsigned int val_reg; | |
182 | ||
183 | BUG_ON(tpa6130a2_client == NULL); | |
184 | data = i2c_get_clientdata(tpa6130a2_client); | |
185 | ||
186 | if (invert) | |
187 | val = mask - val; | |
188 | ||
189 | mutex_lock(&data->mutex); | |
190 | ||
191 | val_reg = tpa6130a2_read(reg); | |
192 | if (((val_reg >> shift) & mask) == val) { | |
193 | mutex_unlock(&data->mutex); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | val_reg &= ~(mask << shift); | |
198 | val_reg |= val << shift; | |
199 | tpa6130a2_i2c_write(reg, val_reg); | |
200 | ||
201 | mutex_unlock(&data->mutex); | |
202 | ||
203 | return 1; | |
204 | } | |
205 | ||
206 | /* | |
207 | * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going | |
208 | * down in gain. | |
209 | */ | |
210 | static const unsigned int tpa6130_tlv[] = { | |
211 | TLV_DB_RANGE_HEAD(10), | |
212 | 0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0), | |
213 | 2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0), | |
214 | 4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0), | |
215 | 6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0), | |
216 | 8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0), | |
217 | 10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0), | |
218 | 12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0), | |
219 | 14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0), | |
220 | 21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0), | |
221 | 38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0), | |
222 | }; | |
223 | ||
224 | static const struct snd_kcontrol_new tpa6130a2_controls[] = { | |
225 | SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume", | |
226 | TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0, | |
227 | tpa6130a2_get_reg, tpa6130a2_set_reg, | |
228 | tpa6130_tlv), | |
229 | }; | |
230 | ||
231 | /* | |
232 | * Enable or disable channel (left or right) | |
233 | * The bit number for mute and amplifier are the same per channel: | |
234 | * bit 6: Right channel | |
235 | * bit 7: Left channel | |
236 | * in both registers. | |
237 | */ | |
238 | static void tpa6130a2_channel_enable(u8 channel, int enable) | |
239 | { | |
240 | struct tpa6130a2_data *data; | |
241 | u8 val; | |
242 | ||
243 | BUG_ON(tpa6130a2_client == NULL); | |
244 | data = i2c_get_clientdata(tpa6130a2_client); | |
245 | ||
246 | if (enable) { | |
247 | /* Enable channel */ | |
248 | /* Enable amplifier */ | |
249 | val = tpa6130a2_read(TPA6130A2_REG_CONTROL); | |
250 | val |= channel; | |
251 | tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val); | |
252 | ||
253 | /* Unmute channel */ | |
254 | val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE); | |
255 | val &= ~channel; | |
256 | tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val); | |
257 | } else { | |
258 | /* Disable channel */ | |
259 | /* Mute channel */ | |
260 | val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE); | |
261 | val |= channel; | |
262 | tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val); | |
263 | ||
264 | /* Disable amplifier */ | |
265 | val = tpa6130a2_read(TPA6130A2_REG_CONTROL); | |
266 | val &= ~channel; | |
267 | tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val); | |
268 | } | |
269 | } | |
270 | ||
271 | static int tpa6130a2_left_event(struct snd_soc_dapm_widget *w, | |
272 | struct snd_kcontrol *kcontrol, int event) | |
273 | { | |
274 | switch (event) { | |
275 | case SND_SOC_DAPM_POST_PMU: | |
276 | tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 1); | |
277 | break; | |
278 | case SND_SOC_DAPM_POST_PMD: | |
279 | tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 0); | |
280 | break; | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static int tpa6130a2_right_event(struct snd_soc_dapm_widget *w, | |
286 | struct snd_kcontrol *kcontrol, int event) | |
287 | { | |
288 | switch (event) { | |
289 | case SND_SOC_DAPM_POST_PMU: | |
290 | tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 1); | |
291 | break; | |
292 | case SND_SOC_DAPM_POST_PMD: | |
293 | tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 0); | |
294 | break; | |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
299 | static int tpa6130a2_supply_event(struct snd_soc_dapm_widget *w, | |
300 | struct snd_kcontrol *kcontrol, int event) | |
301 | { | |
302 | switch (event) { | |
303 | case SND_SOC_DAPM_POST_PMU: | |
304 | tpa6130a2_power(1); | |
305 | break; | |
306 | case SND_SOC_DAPM_POST_PMD: | |
307 | tpa6130a2_power(0); | |
308 | break; | |
309 | } | |
310 | return 0; | |
311 | } | |
312 | ||
313 | static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = { | |
314 | SND_SOC_DAPM_PGA_E("TPA6130A2 Left", SND_SOC_NOPM, | |
315 | 0, 0, NULL, 0, tpa6130a2_left_event, | |
316 | SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD), | |
317 | SND_SOC_DAPM_PGA_E("TPA6130A2 Right", SND_SOC_NOPM, | |
318 | 0, 0, NULL, 0, tpa6130a2_right_event, | |
319 | SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD), | |
320 | SND_SOC_DAPM_SUPPLY("TPA6130A2 Enable", SND_SOC_NOPM, | |
321 | 0, 0, tpa6130a2_supply_event, | |
322 | SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD), | |
323 | /* Outputs */ | |
324 | SND_SOC_DAPM_HP("TPA6130A2 Headphone Left", NULL), | |
325 | SND_SOC_DAPM_HP("TPA6130A2 Headphone Right", NULL), | |
326 | }; | |
327 | ||
328 | static const struct snd_soc_dapm_route audio_map[] = { | |
329 | {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Left"}, | |
330 | {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Right"}, | |
331 | ||
332 | {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Enable"}, | |
333 | {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Enable"}, | |
334 | }; | |
335 | ||
336 | int tpa6130a2_add_controls(struct snd_soc_codec *codec) | |
337 | { | |
338 | snd_soc_dapm_new_controls(codec, tpa6130a2_dapm_widgets, | |
339 | ARRAY_SIZE(tpa6130a2_dapm_widgets)); | |
340 | ||
341 | snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map)); | |
342 | ||
343 | return snd_soc_add_controls(codec, tpa6130a2_controls, | |
344 | ARRAY_SIZE(tpa6130a2_controls)); | |
345 | ||
346 | } | |
347 | EXPORT_SYMBOL_GPL(tpa6130a2_add_controls); | |
348 | ||
349 | static int tpa6130a2_probe(struct i2c_client *client, | |
350 | const struct i2c_device_id *id) | |
351 | { | |
352 | struct device *dev; | |
353 | struct tpa6130a2_data *data; | |
354 | struct tpa6130a2_platform_data *pdata; | |
355 | int ret; | |
356 | ||
357 | dev = &client->dev; | |
358 | ||
359 | if (client->dev.platform_data == NULL) { | |
360 | dev_err(dev, "Platform data not set\n"); | |
361 | dump_stack(); | |
362 | return -ENODEV; | |
363 | } | |
364 | ||
365 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
366 | if (data == NULL) { | |
367 | dev_err(dev, "Can not allocate memory\n"); | |
368 | return -ENOMEM; | |
369 | } | |
370 | ||
371 | tpa6130a2_client = client; | |
372 | ||
373 | i2c_set_clientdata(tpa6130a2_client, data); | |
374 | ||
ebab1b1d | 375 | pdata = client->dev.platform_data; |
493b67ef PU |
376 | data->power_gpio = pdata->power_gpio; |
377 | ||
378 | mutex_init(&data->mutex); | |
379 | ||
380 | /* Set default register values */ | |
381 | data->regs[TPA6130A2_REG_CONTROL] = TPA6130A2_SWS; | |
382 | data->regs[TPA6130A2_REG_VOL_MUTE] = TPA6130A2_MUTE_R | | |
383 | TPA6130A2_MUTE_L; | |
384 | ||
385 | if (data->power_gpio >= 0) { | |
386 | ret = gpio_request(data->power_gpio, "tpa6130a2 enable"); | |
387 | if (ret < 0) { | |
388 | dev_err(dev, "Failed to request power GPIO (%d)\n", | |
389 | data->power_gpio); | |
390 | goto fail; | |
391 | } | |
392 | gpio_direction_output(data->power_gpio, 0); | |
393 | } else { | |
394 | data->power_state = 1; | |
395 | tpa6130a2_initialize(); | |
396 | } | |
397 | ||
398 | tpa6130a2_power(1); | |
399 | ||
400 | /* Read version */ | |
401 | ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) & | |
402 | TPA6130A2_VERSION_MASK; | |
403 | if ((ret != 1) && (ret != 2)) | |
404 | dev_warn(dev, "UNTESTED version detected (%d)\n", ret); | |
405 | ||
406 | /* Disable the chip */ | |
407 | tpa6130a2_power(0); | |
408 | ||
409 | return 0; | |
410 | fail: | |
411 | kfree(data); | |
412 | i2c_set_clientdata(tpa6130a2_client, NULL); | |
ebab1b1d | 413 | tpa6130a2_client = NULL; |
493b67ef PU |
414 | |
415 | return ret; | |
416 | } | |
417 | ||
418 | static int tpa6130a2_remove(struct i2c_client *client) | |
419 | { | |
420 | struct tpa6130a2_data *data = i2c_get_clientdata(client); | |
421 | ||
422 | tpa6130a2_power(0); | |
423 | ||
424 | if (data->power_gpio >= 0) | |
425 | gpio_free(data->power_gpio); | |
426 | kfree(data); | |
ebab1b1d | 427 | tpa6130a2_client = NULL; |
493b67ef PU |
428 | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static const struct i2c_device_id tpa6130a2_id[] = { | |
433 | { "tpa6130a2", 0 }, | |
434 | { } | |
435 | }; | |
436 | MODULE_DEVICE_TABLE(i2c, tpa6130a2_id); | |
437 | ||
438 | static struct i2c_driver tpa6130a2_i2c_driver = { | |
439 | .driver = { | |
440 | .name = "tpa6130a2", | |
441 | .owner = THIS_MODULE, | |
442 | }, | |
443 | .probe = tpa6130a2_probe, | |
444 | .remove = __devexit_p(tpa6130a2_remove), | |
445 | .id_table = tpa6130a2_id, | |
446 | }; | |
447 | ||
448 | static int __init tpa6130a2_init(void) | |
449 | { | |
450 | return i2c_add_driver(&tpa6130a2_i2c_driver); | |
451 | } | |
452 | ||
453 | static void __exit tpa6130a2_exit(void) | |
454 | { | |
455 | i2c_del_driver(&tpa6130a2_i2c_driver); | |
456 | } | |
457 | ||
458 | MODULE_AUTHOR("Peter Ujfalusi"); | |
459 | MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver"); | |
460 | MODULE_LICENSE("GPL"); | |
461 | ||
462 | module_init(tpa6130a2_init); | |
463 | module_exit(tpa6130a2_exit); |