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4d75faa0 TI |
1 | /* |
2 | * Regmap support for HD-audio verbs | |
3 | * | |
4 | * A virtual register is translated to one or more hda verbs for write, | |
5 | * vice versa for read. | |
6 | * | |
7 | * A few limitations: | |
8 | * - Provided for not all verbs but only subset standard non-volatile verbs. | |
9 | * - For reading, only AC_VERB_GET_* variants can be used. | |
10 | * - For writing, mapped to the *corresponding* AC_VERB_SET_* variants, | |
11 | * so can't handle asymmetric verbs for read and write | |
12 | */ | |
13 | ||
14 | #include <linux/slab.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/regmap.h> | |
17 | #include <linux/export.h> | |
18 | #include <linux/pm.h> | |
19 | #include <linux/pm_runtime.h> | |
20 | #include <sound/core.h> | |
21 | #include <sound/hdaudio.h> | |
22 | #include <sound/hda_regmap.h> | |
23 | ||
24 | #ifdef CONFIG_PM | |
25 | #define codec_is_running(codec) \ | |
26 | (atomic_read(&(codec)->in_pm) || \ | |
27 | !pm_runtime_suspended(&(codec)->dev)) | |
28 | #else | |
29 | #define codec_is_running(codec) true | |
30 | #endif | |
31 | ||
32 | #define get_verb(reg) (((reg) >> 8) & 0xfff) | |
33 | ||
34 | static bool hda_volatile_reg(struct device *dev, unsigned int reg) | |
35 | { | |
36 | unsigned int verb = get_verb(reg); | |
37 | ||
38 | switch (verb) { | |
39 | case AC_VERB_GET_PROC_COEF: | |
40 | case AC_VERB_GET_COEF_INDEX: | |
41 | case AC_VERB_GET_PROC_STATE: | |
42 | case AC_VERB_GET_POWER_STATE: | |
43 | case AC_VERB_GET_PIN_SENSE: | |
44 | case AC_VERB_GET_HDMI_DIP_SIZE: | |
45 | case AC_VERB_GET_HDMI_ELDD: | |
46 | case AC_VERB_GET_HDMI_DIP_INDEX: | |
47 | case AC_VERB_GET_HDMI_DIP_DATA: | |
48 | case AC_VERB_GET_HDMI_DIP_XMIT: | |
49 | case AC_VERB_GET_HDMI_CP_CTRL: | |
50 | case AC_VERB_GET_HDMI_CHAN_SLOT: | |
51 | case AC_VERB_GET_DEVICE_SEL: | |
52 | case AC_VERB_GET_DEVICE_LIST: /* read-only volatile */ | |
53 | return true; | |
54 | } | |
55 | ||
56 | return false; | |
57 | } | |
58 | ||
59 | static bool hda_writeable_reg(struct device *dev, unsigned int reg) | |
60 | { | |
faa75f8a | 61 | struct hdac_device *codec = dev_to_hdac_dev(dev); |
4d75faa0 | 62 | unsigned int verb = get_verb(reg); |
5e56bcea TI |
63 | int i; |
64 | ||
65 | for (i = 0; i < codec->vendor_verbs.used; i++) { | |
66 | unsigned int *v = snd_array_elem(&codec->vendor_verbs, i); | |
67 | if (verb == *v) | |
68 | return true; | |
69 | } | |
4d75faa0 | 70 | |
faa75f8a TI |
71 | if (codec->caps_overwriting) |
72 | return true; | |
73 | ||
4d75faa0 TI |
74 | switch (verb & 0xf00) { |
75 | case AC_VERB_GET_STREAM_FORMAT: | |
76 | case AC_VERB_GET_AMP_GAIN_MUTE: | |
77 | return true; | |
78 | case 0xf00: | |
79 | break; | |
80 | default: | |
81 | return false; | |
82 | } | |
83 | ||
84 | switch (verb) { | |
85 | case AC_VERB_GET_CONNECT_SEL: | |
86 | case AC_VERB_GET_SDI_SELECT: | |
87 | case AC_VERB_GET_CONV: | |
88 | case AC_VERB_GET_PIN_WIDGET_CONTROL: | |
89 | case AC_VERB_GET_UNSOLICITED_RESPONSE: /* only as SET_UNSOLICITED_ENABLE */ | |
90 | case AC_VERB_GET_BEEP_CONTROL: | |
91 | case AC_VERB_GET_EAPD_BTLENABLE: | |
92 | case AC_VERB_GET_DIGI_CONVERT_1: | |
93 | case AC_VERB_GET_DIGI_CONVERT_2: /* only for beep control */ | |
94 | case AC_VERB_GET_VOLUME_KNOB_CONTROL: | |
95 | case AC_VERB_GET_CONFIG_DEFAULT: | |
96 | case AC_VERB_GET_GPIO_MASK: | |
97 | case AC_VERB_GET_GPIO_DIRECTION: | |
98 | case AC_VERB_GET_GPIO_DATA: /* not for volatile read */ | |
99 | case AC_VERB_GET_GPIO_WAKE_MASK: | |
100 | case AC_VERB_GET_GPIO_UNSOLICITED_RSP_MASK: | |
101 | case AC_VERB_GET_GPIO_STICKY_MASK: | |
102 | case AC_VERB_GET_CVT_CHAN_COUNT: | |
103 | return true; | |
104 | } | |
105 | ||
106 | return false; | |
107 | } | |
108 | ||
109 | static bool hda_readable_reg(struct device *dev, unsigned int reg) | |
110 | { | |
faa75f8a | 111 | struct hdac_device *codec = dev_to_hdac_dev(dev); |
4d75faa0 TI |
112 | unsigned int verb = get_verb(reg); |
113 | ||
faa75f8a TI |
114 | if (codec->caps_overwriting) |
115 | return true; | |
116 | ||
4d75faa0 TI |
117 | switch (verb) { |
118 | case AC_VERB_PARAMETERS: | |
119 | case AC_VERB_GET_CONNECT_LIST: | |
120 | case AC_VERB_GET_SUBSYSTEM_ID: | |
121 | return true; | |
122 | } | |
123 | ||
124 | return hda_writeable_reg(dev, reg); | |
125 | } | |
126 | ||
d313e0a8 TI |
127 | /* |
128 | * Stereo amp pseudo register: | |
129 | * for making easier to handle the stereo volume control, we provide a | |
130 | * fake register to deal both left and right channels by a single | |
131 | * (pseudo) register access. A verb consisting of SET_AMP_GAIN with | |
132 | * *both* SET_LEFT and SET_RIGHT bits takes a 16bit value, the lower 8bit | |
133 | * for the left and the upper 8bit for the right channel. | |
134 | */ | |
135 | static bool is_stereo_amp_verb(unsigned int reg) | |
136 | { | |
137 | if (((reg >> 8) & 0x700) != AC_VERB_SET_AMP_GAIN_MUTE) | |
138 | return false; | |
139 | return (reg & (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT)) == | |
140 | (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); | |
141 | } | |
142 | ||
143 | /* read a pseudo stereo amp register (16bit left+right) */ | |
144 | static int hda_reg_read_stereo_amp(struct hdac_device *codec, | |
145 | unsigned int reg, unsigned int *val) | |
146 | { | |
147 | unsigned int left, right; | |
148 | int err; | |
149 | ||
150 | reg &= ~(AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); | |
151 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_LEFT, 0, &left); | |
152 | if (err < 0) | |
153 | return err; | |
154 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_RIGHT, 0, &right); | |
155 | if (err < 0) | |
156 | return err; | |
157 | *val = left | (right << 8); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* write a pseudo stereo amp register (16bit left+right) */ | |
162 | static int hda_reg_write_stereo_amp(struct hdac_device *codec, | |
163 | unsigned int reg, unsigned int val) | |
164 | { | |
165 | int err; | |
166 | unsigned int verb, left, right; | |
167 | ||
168 | verb = AC_VERB_SET_AMP_GAIN_MUTE << 8; | |
169 | if (reg & AC_AMP_GET_OUTPUT) | |
170 | verb |= AC_AMP_SET_OUTPUT; | |
171 | else | |
172 | verb |= AC_AMP_SET_INPUT | ((reg & 0xf) << 8); | |
173 | reg = (reg & ~0xfffff) | verb; | |
174 | ||
175 | left = val & 0xff; | |
176 | right = (val >> 8) & 0xff; | |
177 | if (left == right) { | |
178 | reg |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT; | |
179 | return snd_hdac_exec_verb(codec, reg | left, 0, NULL); | |
180 | } | |
181 | ||
182 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_LEFT | left, 0, NULL); | |
183 | if (err < 0) | |
184 | return err; | |
185 | err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_RIGHT | right, 0, NULL); | |
186 | if (err < 0) | |
187 | return err; | |
188 | return 0; | |
189 | } | |
190 | ||
4d75faa0 TI |
191 | static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) |
192 | { | |
193 | struct hdac_device *codec = context; | |
33f81940 | 194 | int err; |
4d75faa0 TI |
195 | |
196 | if (!codec_is_running(codec)) | |
197 | return -EAGAIN; | |
198 | reg |= (codec->addr << 28); | |
d313e0a8 TI |
199 | if (is_stereo_amp_verb(reg)) |
200 | return hda_reg_read_stereo_amp(codec, reg, val); | |
33f81940 TI |
201 | err = snd_hdac_exec_verb(codec, reg, 0, val); |
202 | if (err < 0) | |
203 | return err; | |
204 | /* special handling for asymmetric reads */ | |
205 | if (get_verb(reg) == AC_VERB_GET_POWER_STATE) { | |
206 | if (*val & AC_PWRST_ERROR) | |
207 | *val = -1; | |
208 | else /* take only the actual state */ | |
209 | *val = (*val >> 4) & 0x0f; | |
210 | } | |
211 | return 0; | |
4d75faa0 TI |
212 | } |
213 | ||
214 | static int hda_reg_write(void *context, unsigned int reg, unsigned int val) | |
215 | { | |
216 | struct hdac_device *codec = context; | |
217 | unsigned int verb; | |
218 | int i, bytes, err; | |
219 | ||
220 | if (!codec_is_running(codec)) | |
221 | return codec->lazy_cache ? 0 : -EAGAIN; | |
222 | ||
223 | reg &= ~0x00080000U; /* drop GET bit */ | |
224 | reg |= (codec->addr << 28); | |
4d75faa0 | 225 | |
d313e0a8 TI |
226 | if (is_stereo_amp_verb(reg)) |
227 | return hda_reg_write_stereo_amp(codec, reg, val); | |
228 | ||
229 | verb = get_verb(reg); | |
4d75faa0 TI |
230 | switch (verb & 0xf00) { |
231 | case AC_VERB_SET_AMP_GAIN_MUTE: | |
232 | verb = AC_VERB_SET_AMP_GAIN_MUTE; | |
233 | if (reg & AC_AMP_GET_LEFT) | |
234 | verb |= AC_AMP_SET_LEFT >> 8; | |
235 | else | |
236 | verb |= AC_AMP_SET_RIGHT >> 8; | |
237 | if (reg & AC_AMP_GET_OUTPUT) { | |
238 | verb |= AC_AMP_SET_OUTPUT >> 8; | |
239 | } else { | |
240 | verb |= AC_AMP_SET_INPUT >> 8; | |
241 | verb |= reg & 0xf; | |
242 | } | |
243 | break; | |
244 | } | |
245 | ||
246 | switch (verb) { | |
247 | case AC_VERB_SET_DIGI_CONVERT_1: | |
248 | bytes = 2; | |
249 | break; | |
250 | case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0: | |
251 | bytes = 4; | |
252 | break; | |
253 | default: | |
254 | bytes = 1; | |
255 | break; | |
256 | } | |
257 | ||
258 | for (i = 0; i < bytes; i++) { | |
259 | reg &= ~0xfffff; | |
260 | reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff); | |
261 | err = snd_hdac_exec_verb(codec, reg, 0, NULL); | |
262 | if (err < 0) | |
263 | return err; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static const struct regmap_config hda_regmap_cfg = { | |
270 | .name = "hdaudio", | |
271 | .reg_bits = 32, | |
272 | .val_bits = 32, | |
273 | .max_register = 0xfffffff, | |
274 | .writeable_reg = hda_writeable_reg, | |
275 | .readable_reg = hda_readable_reg, | |
276 | .volatile_reg = hda_volatile_reg, | |
277 | .cache_type = REGCACHE_RBTREE, | |
278 | .reg_read = hda_reg_read, | |
279 | .reg_write = hda_reg_write, | |
280 | }; | |
281 | ||
282 | int snd_hdac_regmap_init(struct hdac_device *codec) | |
283 | { | |
284 | struct regmap *regmap; | |
285 | ||
286 | regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg); | |
287 | if (IS_ERR(regmap)) | |
288 | return PTR_ERR(regmap); | |
289 | codec->regmap = regmap; | |
5e56bcea | 290 | snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8); |
4d75faa0 TI |
291 | return 0; |
292 | } | |
293 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_init); | |
294 | ||
295 | void snd_hdac_regmap_exit(struct hdac_device *codec) | |
296 | { | |
297 | if (codec->regmap) { | |
298 | regmap_exit(codec->regmap); | |
299 | codec->regmap = NULL; | |
5e56bcea | 300 | snd_array_free(&codec->vendor_verbs); |
4d75faa0 TI |
301 | } |
302 | } | |
303 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit); | |
304 | ||
5e56bcea TI |
305 | /** |
306 | * snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap | |
307 | * @codec: the codec object | |
308 | * @verb: verb to allow accessing via regmap | |
309 | * | |
310 | * Returns zero for success or a negative error code. | |
311 | */ | |
312 | int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec, | |
313 | unsigned int verb) | |
314 | { | |
315 | unsigned int *p = snd_array_new(&codec->vendor_verbs); | |
316 | ||
317 | if (!p) | |
318 | return -ENOMEM; | |
319 | *p = verb; | |
320 | return 0; | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb); | |
323 | ||
4d75faa0 TI |
324 | /* |
325 | * helper functions | |
326 | */ | |
327 | ||
328 | /* write a pseudo-register value (w/o power sequence) */ | |
329 | static int reg_raw_write(struct hdac_device *codec, unsigned int reg, | |
330 | unsigned int val) | |
331 | { | |
332 | if (!codec->regmap) | |
333 | return hda_reg_write(codec, reg, val); | |
334 | else | |
335 | return regmap_write(codec->regmap, reg, val); | |
336 | } | |
337 | ||
338 | /** | |
339 | * snd_hdac_regmap_write_raw - write a pseudo register with power mgmt | |
340 | * @codec: the codec object | |
341 | * @reg: pseudo register | |
342 | * @val: value to write | |
343 | * | |
344 | * Returns zero if successful or a negative error code. | |
345 | */ | |
346 | int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg, | |
347 | unsigned int val) | |
348 | { | |
349 | int err; | |
350 | ||
351 | err = reg_raw_write(codec, reg, val); | |
352 | if (err == -EAGAIN) { | |
353 | snd_hdac_power_up(codec); | |
354 | err = reg_raw_write(codec, reg, val); | |
355 | snd_hdac_power_down(codec); | |
356 | } | |
357 | return err; | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw); | |
360 | ||
361 | static int reg_raw_read(struct hdac_device *codec, unsigned int reg, | |
362 | unsigned int *val) | |
363 | { | |
364 | if (!codec->regmap) | |
365 | return hda_reg_read(codec, reg, val); | |
366 | else | |
367 | return regmap_read(codec->regmap, reg, val); | |
368 | } | |
369 | ||
370 | /** | |
371 | * snd_hdac_regmap_read_raw - read a pseudo register with power mgmt | |
372 | * @codec: the codec object | |
373 | * @reg: pseudo register | |
374 | * @val: pointer to store the read value | |
375 | * | |
376 | * Returns zero if successful or a negative error code. | |
377 | */ | |
378 | int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, | |
379 | unsigned int *val) | |
380 | { | |
381 | int err; | |
382 | ||
383 | err = reg_raw_read(codec, reg, val); | |
384 | if (err == -EAGAIN) { | |
385 | snd_hdac_power_up(codec); | |
386 | err = reg_raw_read(codec, reg, val); | |
387 | snd_hdac_power_down(codec); | |
388 | } | |
389 | return err; | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw); | |
392 | ||
393 | /** | |
394 | * snd_hdac_regmap_update_raw - update a pseudo register with power mgmt | |
395 | * @codec: the codec object | |
396 | * @reg: pseudo register | |
397 | * @mask: bit mask to udpate | |
398 | * @val: value to update | |
399 | * | |
400 | * Returns zero if successful or a negative error code. | |
401 | */ | |
402 | int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg, | |
403 | unsigned int mask, unsigned int val) | |
404 | { | |
405 | unsigned int orig; | |
406 | int err; | |
407 | ||
408 | val &= mask; | |
409 | err = snd_hdac_regmap_read_raw(codec, reg, &orig); | |
410 | if (err < 0) | |
411 | return err; | |
412 | val |= orig & ~mask; | |
413 | if (val == orig) | |
414 | return 0; | |
415 | err = snd_hdac_regmap_write_raw(codec, reg, val); | |
416 | if (err < 0) | |
417 | return err; | |
418 | return 1; | |
419 | } | |
420 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw); |