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2880fc87 DR |
1 | /* |
2 | * TS3A227E Autonomous Audio Accessory Detection and Configuration Switch | |
3 | * | |
4 | * Copyright (C) 2014 Google, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/gpio.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/input.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of_gpio.h> | |
17 | #include <linux/regmap.h> | |
18 | ||
19 | #include <sound/core.h> | |
20 | #include <sound/jack.h> | |
21 | #include <sound/soc.h> | |
22 | ||
23 | struct ts3a227e { | |
24 | struct regmap *regmap; | |
25 | struct snd_soc_jack *jack; | |
26 | bool plugged; | |
27 | bool mic_present; | |
28 | unsigned int buttons_held; | |
29 | }; | |
30 | ||
31 | /* Button values to be reported on the jack */ | |
32 | static const int ts3a227e_buttons[] = { | |
33 | SND_JACK_BTN_0, | |
34 | SND_JACK_BTN_1, | |
35 | SND_JACK_BTN_2, | |
36 | SND_JACK_BTN_3, | |
37 | }; | |
38 | ||
39 | #define TS3A227E_NUM_BUTTONS 4 | |
40 | #define TS3A227E_JACK_MASK (SND_JACK_HEADPHONE | \ | |
41 | SND_JACK_MICROPHONE | \ | |
42 | SND_JACK_BTN_0 | \ | |
43 | SND_JACK_BTN_1 | \ | |
44 | SND_JACK_BTN_2 | \ | |
45 | SND_JACK_BTN_3) | |
46 | ||
47 | /* TS3A227E registers */ | |
48 | #define TS3A227E_REG_DEVICE_ID 0x00 | |
49 | #define TS3A227E_REG_INTERRUPT 0x01 | |
50 | #define TS3A227E_REG_KP_INTERRUPT 0x02 | |
51 | #define TS3A227E_REG_INTERRUPT_DISABLE 0x03 | |
52 | #define TS3A227E_REG_SETTING_1 0x04 | |
53 | #define TS3A227E_REG_SETTING_2 0x05 | |
54 | #define TS3A227E_REG_SETTING_3 0x06 | |
55 | #define TS3A227E_REG_SWITCH_CONTROL_1 0x07 | |
56 | #define TS3A227E_REG_SWITCH_CONTROL_2 0x08 | |
57 | #define TS3A227E_REG_SWITCH_STATUS_1 0x09 | |
58 | #define TS3A227E_REG_SWITCH_STATUS_2 0x0a | |
59 | #define TS3A227E_REG_ACCESSORY_STATUS 0x0b | |
60 | #define TS3A227E_REG_ADC_OUTPUT 0x0c | |
61 | #define TS3A227E_REG_KP_THRESHOLD_1 0x0d | |
62 | #define TS3A227E_REG_KP_THRESHOLD_2 0x0e | |
63 | #define TS3A227E_REG_KP_THRESHOLD_3 0x0f | |
64 | ||
65 | /* TS3A227E_REG_INTERRUPT 0x01 */ | |
66 | #define INS_REM_EVENT 0x01 | |
67 | #define DETECTION_COMPLETE_EVENT 0x02 | |
68 | ||
69 | /* TS3A227E_REG_KP_INTERRUPT 0x02 */ | |
70 | #define PRESS_MASK(idx) (0x01 << (2 * (idx))) | |
71 | #define RELEASE_MASK(idx) (0x02 << (2 * (idx))) | |
72 | ||
73 | /* TS3A227E_REG_INTERRUPT_DISABLE 0x03 */ | |
74 | #define INS_REM_INT_DISABLE 0x01 | |
75 | #define DETECTION_COMPLETE_INT_DISABLE 0x02 | |
76 | #define ADC_COMPLETE_INT_DISABLE 0x04 | |
77 | #define INTB_DISABLE 0x08 | |
78 | ||
79 | /* TS3A227E_REG_SETTING_2 0x05 */ | |
80 | #define KP_ENABLE 0x04 | |
81 | ||
82 | /* TS3A227E_REG_ACCESSORY_STATUS 0x0b */ | |
83 | #define TYPE_3_POLE 0x01 | |
84 | #define TYPE_4_POLE_OMTP 0x02 | |
85 | #define TYPE_4_POLE_STANDARD 0x04 | |
86 | #define JACK_INSERTED 0x08 | |
87 | #define EITHER_MIC_MASK (TYPE_4_POLE_OMTP | TYPE_4_POLE_STANDARD) | |
88 | ||
89 | static const struct reg_default ts3a227e_reg_defaults[] = { | |
90 | { TS3A227E_REG_DEVICE_ID, 0x10 }, | |
91 | { TS3A227E_REG_INTERRUPT, 0x00 }, | |
92 | { TS3A227E_REG_KP_INTERRUPT, 0x00 }, | |
93 | { TS3A227E_REG_INTERRUPT_DISABLE, 0x08 }, | |
94 | { TS3A227E_REG_SETTING_1, 0x23 }, | |
95 | { TS3A227E_REG_SETTING_2, 0x00 }, | |
96 | { TS3A227E_REG_SETTING_3, 0x0e }, | |
97 | { TS3A227E_REG_SWITCH_CONTROL_1, 0x00 }, | |
98 | { TS3A227E_REG_SWITCH_CONTROL_2, 0x00 }, | |
99 | { TS3A227E_REG_SWITCH_STATUS_1, 0x0c }, | |
100 | { TS3A227E_REG_SWITCH_STATUS_2, 0x00 }, | |
101 | { TS3A227E_REG_ACCESSORY_STATUS, 0x00 }, | |
102 | { TS3A227E_REG_ADC_OUTPUT, 0x00 }, | |
103 | { TS3A227E_REG_KP_THRESHOLD_1, 0x20 }, | |
104 | { TS3A227E_REG_KP_THRESHOLD_2, 0x40 }, | |
105 | { TS3A227E_REG_KP_THRESHOLD_3, 0x68 }, | |
106 | }; | |
107 | ||
108 | static bool ts3a227e_readable_reg(struct device *dev, unsigned int reg) | |
109 | { | |
110 | switch (reg) { | |
111 | case TS3A227E_REG_DEVICE_ID ... TS3A227E_REG_KP_THRESHOLD_3: | |
112 | return true; | |
113 | default: | |
114 | return false; | |
115 | } | |
116 | } | |
117 | ||
118 | static bool ts3a227e_writeable_reg(struct device *dev, unsigned int reg) | |
119 | { | |
120 | switch (reg) { | |
121 | case TS3A227E_REG_INTERRUPT_DISABLE ... TS3A227E_REG_SWITCH_CONTROL_2: | |
122 | case TS3A227E_REG_KP_THRESHOLD_1 ... TS3A227E_REG_KP_THRESHOLD_3: | |
123 | return true; | |
124 | default: | |
125 | return false; | |
126 | } | |
127 | } | |
128 | ||
129 | static bool ts3a227e_volatile_reg(struct device *dev, unsigned int reg) | |
130 | { | |
131 | switch (reg) { | |
132 | case TS3A227E_REG_INTERRUPT ... TS3A227E_REG_INTERRUPT_DISABLE: | |
133 | case TS3A227E_REG_SETTING_2: | |
134 | case TS3A227E_REG_SWITCH_STATUS_1 ... TS3A227E_REG_ADC_OUTPUT: | |
135 | return true; | |
136 | default: | |
137 | return false; | |
138 | } | |
139 | } | |
140 | ||
141 | static void ts3a227e_jack_report(struct ts3a227e *ts3a227e) | |
142 | { | |
143 | unsigned int i; | |
144 | int report = 0; | |
145 | ||
146 | if (!ts3a227e->jack) | |
147 | return; | |
148 | ||
149 | if (ts3a227e->plugged) | |
150 | report = SND_JACK_HEADPHONE; | |
151 | if (ts3a227e->mic_present) | |
152 | report |= SND_JACK_MICROPHONE; | |
153 | for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) { | |
154 | if (ts3a227e->buttons_held & (1 << i)) | |
155 | report |= ts3a227e_buttons[i]; | |
156 | } | |
157 | snd_soc_jack_report(ts3a227e->jack, report, TS3A227E_JACK_MASK); | |
158 | } | |
159 | ||
160 | static void ts3a227e_new_jack_state(struct ts3a227e *ts3a227e, unsigned acc_reg) | |
161 | { | |
162 | bool plugged, mic_present; | |
163 | ||
164 | plugged = !!(acc_reg & JACK_INSERTED); | |
165 | mic_present = plugged && !!(acc_reg & EITHER_MIC_MASK); | |
166 | ||
167 | ts3a227e->plugged = plugged; | |
168 | ||
169 | if (mic_present != ts3a227e->mic_present) { | |
170 | ts3a227e->mic_present = mic_present; | |
171 | ts3a227e->buttons_held = 0; | |
172 | if (mic_present) { | |
173 | /* Enable key press detection. */ | |
174 | regmap_update_bits(ts3a227e->regmap, | |
175 | TS3A227E_REG_SETTING_2, | |
176 | KP_ENABLE, KP_ENABLE); | |
177 | } | |
178 | } | |
179 | } | |
180 | ||
181 | static irqreturn_t ts3a227e_interrupt(int irq, void *data) | |
182 | { | |
183 | struct ts3a227e *ts3a227e = (struct ts3a227e *)data; | |
184 | struct regmap *regmap = ts3a227e->regmap; | |
185 | unsigned int int_reg, kp_int_reg, acc_reg, i; | |
186 | ||
187 | /* Check for plug/unplug. */ | |
188 | regmap_read(regmap, TS3A227E_REG_INTERRUPT, &int_reg); | |
189 | if (int_reg & (DETECTION_COMPLETE_EVENT | INS_REM_EVENT)) { | |
190 | regmap_read(regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg); | |
191 | ts3a227e_new_jack_state(ts3a227e, acc_reg); | |
192 | } | |
193 | ||
194 | /* Report any key events. */ | |
195 | regmap_read(regmap, TS3A227E_REG_KP_INTERRUPT, &kp_int_reg); | |
196 | for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) { | |
197 | if (kp_int_reg & PRESS_MASK(i)) | |
198 | ts3a227e->buttons_held |= (1 << i); | |
199 | if (kp_int_reg & RELEASE_MASK(i)) | |
200 | ts3a227e->buttons_held &= ~(1 << i); | |
201 | } | |
202 | ||
203 | ts3a227e_jack_report(ts3a227e); | |
204 | ||
205 | return IRQ_HANDLED; | |
206 | } | |
207 | ||
208 | /** | |
209 | * ts3a227e_enable_jack_detect - Specify a jack for event reporting | |
210 | * | |
211 | * @component: component to register the jack with | |
212 | * @jack: jack to use to report headset and button events on | |
213 | * | |
214 | * After this function has been called the headset insert/remove and button | |
215 | * events 0-3 will be routed to the given jack. Jack can be null to stop | |
216 | * reporting. | |
217 | */ | |
218 | int ts3a227e_enable_jack_detect(struct snd_soc_component *component, | |
219 | struct snd_soc_jack *jack) | |
220 | { | |
221 | struct ts3a227e *ts3a227e = snd_soc_component_get_drvdata(component); | |
222 | ||
223 | snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_MEDIA); | |
ddf9ea21 AP |
224 | snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND); |
225 | snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP); | |
226 | snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN); | |
2880fc87 DR |
227 | |
228 | ts3a227e->jack = jack; | |
229 | ts3a227e_jack_report(ts3a227e); | |
230 | ||
231 | return 0; | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(ts3a227e_enable_jack_detect); | |
234 | ||
235 | static struct snd_soc_component_driver ts3a227e_soc_driver; | |
236 | ||
237 | static const struct regmap_config ts3a227e_regmap_config = { | |
238 | .val_bits = 8, | |
239 | .reg_bits = 8, | |
240 | ||
241 | .max_register = TS3A227E_REG_KP_THRESHOLD_3, | |
242 | .readable_reg = ts3a227e_readable_reg, | |
243 | .writeable_reg = ts3a227e_writeable_reg, | |
244 | .volatile_reg = ts3a227e_volatile_reg, | |
245 | ||
246 | .cache_type = REGCACHE_RBTREE, | |
247 | .reg_defaults = ts3a227e_reg_defaults, | |
248 | .num_reg_defaults = ARRAY_SIZE(ts3a227e_reg_defaults), | |
249 | }; | |
250 | ||
251 | static int ts3a227e_i2c_probe(struct i2c_client *i2c, | |
252 | const struct i2c_device_id *id) | |
253 | { | |
254 | struct ts3a227e *ts3a227e; | |
255 | struct device *dev = &i2c->dev; | |
256 | int ret; | |
257 | ||
258 | ts3a227e = devm_kzalloc(&i2c->dev, sizeof(*ts3a227e), GFP_KERNEL); | |
259 | if (ts3a227e == NULL) | |
260 | return -ENOMEM; | |
261 | ||
262 | i2c_set_clientdata(i2c, ts3a227e); | |
263 | ||
264 | ts3a227e->regmap = devm_regmap_init_i2c(i2c, &ts3a227e_regmap_config); | |
265 | if (IS_ERR(ts3a227e->regmap)) | |
266 | return PTR_ERR(ts3a227e->regmap); | |
267 | ||
268 | ret = devm_request_threaded_irq(dev, i2c->irq, NULL, ts3a227e_interrupt, | |
269 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
270 | "TS3A227E", ts3a227e); | |
271 | if (ret) { | |
272 | dev_err(dev, "Cannot request irq %d (%d)\n", i2c->irq, ret); | |
273 | return ret; | |
274 | } | |
275 | ||
276 | ret = devm_snd_soc_register_component(&i2c->dev, &ts3a227e_soc_driver, | |
277 | NULL, 0); | |
278 | if (ret) | |
279 | return ret; | |
280 | ||
281 | /* Enable interrupts except for ADC complete. */ | |
282 | regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_INTERRUPT_DISABLE, | |
283 | INTB_DISABLE | ADC_COMPLETE_INT_DISABLE, | |
284 | ADC_COMPLETE_INT_DISABLE); | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | static const struct i2c_device_id ts3a227e_i2c_ids[] = { | |
290 | { "ts3a227e", 0 }, | |
291 | { } | |
292 | }; | |
293 | MODULE_DEVICE_TABLE(i2c, ts3a227e_i2c_ids); | |
294 | ||
295 | static const struct of_device_id ts3a227e_of_match[] = { | |
296 | { .compatible = "ti,ts3a227e", }, | |
297 | { } | |
298 | }; | |
299 | MODULE_DEVICE_TABLE(of, ts3a227e_of_match); | |
300 | ||
301 | static struct i2c_driver ts3a227e_driver = { | |
302 | .driver = { | |
303 | .name = "ts3a227e", | |
304 | .owner = THIS_MODULE, | |
305 | .of_match_table = of_match_ptr(ts3a227e_of_match), | |
306 | }, | |
307 | .probe = ts3a227e_i2c_probe, | |
308 | .id_table = ts3a227e_i2c_ids, | |
309 | }; | |
310 | module_i2c_driver(ts3a227e_driver); | |
311 | ||
312 | MODULE_DESCRIPTION("ASoC ts3a227e driver"); | |
313 | MODULE_AUTHOR("Dylan Reid <dgreid@chromium.org>"); | |
314 | MODULE_LICENSE("GPL v2"); |