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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 | { | |
61 | struct hdac_device *codec = dev_to_hdac_dev(dev); | |
62 | unsigned int verb = get_verb(reg); | |
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 | } | |
70 | ||
71 | if (codec->caps_overwriting) | |
72 | return true; | |
73 | ||
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 | { | |
111 | struct hdac_device *codec = dev_to_hdac_dev(dev); | |
112 | unsigned int verb = get_verb(reg); | |
113 | ||
114 | if (codec->caps_overwriting) | |
115 | return true; | |
116 | ||
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 | ||
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 | ||
191 | static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) | |
192 | { | |
193 | struct hdac_device *codec = context; | |
194 | ||
195 | if (!codec_is_running(codec)) | |
196 | return -EAGAIN; | |
197 | reg |= (codec->addr << 28); | |
198 | if (is_stereo_amp_verb(reg)) | |
199 | return hda_reg_read_stereo_amp(codec, reg, val); | |
200 | return snd_hdac_exec_verb(codec, reg, 0, val); | |
201 | } | |
202 | ||
203 | static int hda_reg_write(void *context, unsigned int reg, unsigned int val) | |
204 | { | |
205 | struct hdac_device *codec = context; | |
206 | unsigned int verb; | |
207 | int i, bytes, err; | |
208 | ||
209 | if (!codec_is_running(codec)) | |
210 | return codec->lazy_cache ? 0 : -EAGAIN; | |
211 | ||
212 | reg &= ~0x00080000U; /* drop GET bit */ | |
213 | reg |= (codec->addr << 28); | |
214 | ||
215 | if (is_stereo_amp_verb(reg)) | |
216 | return hda_reg_write_stereo_amp(codec, reg, val); | |
217 | ||
218 | verb = get_verb(reg); | |
219 | switch (verb & 0xf00) { | |
220 | case AC_VERB_SET_AMP_GAIN_MUTE: | |
221 | verb = AC_VERB_SET_AMP_GAIN_MUTE; | |
222 | if (reg & AC_AMP_GET_LEFT) | |
223 | verb |= AC_AMP_SET_LEFT >> 8; | |
224 | else | |
225 | verb |= AC_AMP_SET_RIGHT >> 8; | |
226 | if (reg & AC_AMP_GET_OUTPUT) { | |
227 | verb |= AC_AMP_SET_OUTPUT >> 8; | |
228 | } else { | |
229 | verb |= AC_AMP_SET_INPUT >> 8; | |
230 | verb |= reg & 0xf; | |
231 | } | |
232 | break; | |
233 | } | |
234 | ||
235 | switch (verb) { | |
236 | case AC_VERB_SET_DIGI_CONVERT_1: | |
237 | bytes = 2; | |
238 | break; | |
239 | case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0: | |
240 | bytes = 4; | |
241 | break; | |
242 | default: | |
243 | bytes = 1; | |
244 | break; | |
245 | } | |
246 | ||
247 | for (i = 0; i < bytes; i++) { | |
248 | reg &= ~0xfffff; | |
249 | reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff); | |
250 | err = snd_hdac_exec_verb(codec, reg, 0, NULL); | |
251 | if (err < 0) | |
252 | return err; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static const struct regmap_config hda_regmap_cfg = { | |
259 | .name = "hdaudio", | |
260 | .reg_bits = 32, | |
261 | .val_bits = 32, | |
262 | .max_register = 0xfffffff, | |
263 | .writeable_reg = hda_writeable_reg, | |
264 | .readable_reg = hda_readable_reg, | |
265 | .volatile_reg = hda_volatile_reg, | |
266 | .cache_type = REGCACHE_RBTREE, | |
267 | .reg_read = hda_reg_read, | |
268 | .reg_write = hda_reg_write, | |
269 | }; | |
270 | ||
271 | int snd_hdac_regmap_init(struct hdac_device *codec) | |
272 | { | |
273 | struct regmap *regmap; | |
274 | ||
275 | regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg); | |
276 | if (IS_ERR(regmap)) | |
277 | return PTR_ERR(regmap); | |
278 | codec->regmap = regmap; | |
279 | snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8); | |
280 | return 0; | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_init); | |
283 | ||
284 | void snd_hdac_regmap_exit(struct hdac_device *codec) | |
285 | { | |
286 | if (codec->regmap) { | |
287 | regmap_exit(codec->regmap); | |
288 | codec->regmap = NULL; | |
289 | snd_array_free(&codec->vendor_verbs); | |
290 | } | |
291 | } | |
292 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit); | |
293 | ||
294 | /** | |
295 | * snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap | |
296 | * @codec: the codec object | |
297 | * @verb: verb to allow accessing via regmap | |
298 | * | |
299 | * Returns zero for success or a negative error code. | |
300 | */ | |
301 | int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec, | |
302 | unsigned int verb) | |
303 | { | |
304 | unsigned int *p = snd_array_new(&codec->vendor_verbs); | |
305 | ||
306 | if (!p) | |
307 | return -ENOMEM; | |
308 | *p = verb; | |
309 | return 0; | |
310 | } | |
311 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb); | |
312 | ||
313 | /* | |
314 | * helper functions | |
315 | */ | |
316 | ||
317 | /* write a pseudo-register value (w/o power sequence) */ | |
318 | static int reg_raw_write(struct hdac_device *codec, unsigned int reg, | |
319 | unsigned int val) | |
320 | { | |
321 | if (!codec->regmap) | |
322 | return hda_reg_write(codec, reg, val); | |
323 | else | |
324 | return regmap_write(codec->regmap, reg, val); | |
325 | } | |
326 | ||
327 | /** | |
328 | * snd_hdac_regmap_write_raw - write a pseudo register with power mgmt | |
329 | * @codec: the codec object | |
330 | * @reg: pseudo register | |
331 | * @val: value to write | |
332 | * | |
333 | * Returns zero if successful or a negative error code. | |
334 | */ | |
335 | int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg, | |
336 | unsigned int val) | |
337 | { | |
338 | int err; | |
339 | ||
340 | err = reg_raw_write(codec, reg, val); | |
341 | if (err == -EAGAIN) { | |
342 | snd_hdac_power_up(codec); | |
343 | err = reg_raw_write(codec, reg, val); | |
344 | snd_hdac_power_down(codec); | |
345 | } | |
346 | return err; | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw); | |
349 | ||
350 | static int reg_raw_read(struct hdac_device *codec, unsigned int reg, | |
351 | unsigned int *val) | |
352 | { | |
353 | if (!codec->regmap) | |
354 | return hda_reg_read(codec, reg, val); | |
355 | else | |
356 | return regmap_read(codec->regmap, reg, val); | |
357 | } | |
358 | ||
359 | /** | |
360 | * snd_hdac_regmap_read_raw - read a pseudo register with power mgmt | |
361 | * @codec: the codec object | |
362 | * @reg: pseudo register | |
363 | * @val: pointer to store the read value | |
364 | * | |
365 | * Returns zero if successful or a negative error code. | |
366 | */ | |
367 | int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, | |
368 | unsigned int *val) | |
369 | { | |
370 | int err; | |
371 | ||
372 | err = reg_raw_read(codec, reg, val); | |
373 | if (err == -EAGAIN) { | |
374 | snd_hdac_power_up(codec); | |
375 | err = reg_raw_read(codec, reg, val); | |
376 | snd_hdac_power_down(codec); | |
377 | } | |
378 | return err; | |
379 | } | |
380 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw); | |
381 | ||
382 | /** | |
383 | * snd_hdac_regmap_update_raw - update a pseudo register with power mgmt | |
384 | * @codec: the codec object | |
385 | * @reg: pseudo register | |
386 | * @mask: bit mask to udpate | |
387 | * @val: value to update | |
388 | * | |
389 | * Returns zero if successful or a negative error code. | |
390 | */ | |
391 | int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg, | |
392 | unsigned int mask, unsigned int val) | |
393 | { | |
394 | unsigned int orig; | |
395 | int err; | |
396 | ||
397 | val &= mask; | |
398 | err = snd_hdac_regmap_read_raw(codec, reg, &orig); | |
399 | if (err < 0) | |
400 | return err; | |
401 | val |= orig & ~mask; | |
402 | if (val == orig) | |
403 | return 0; | |
404 | err = snd_hdac_regmap_write_raw(codec, reg, val); | |
405 | if (err < 0) | |
406 | return err; | |
407 | return 1; | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw); |