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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 | { | |
61 | unsigned int verb = get_verb(reg); | |
62 | ||
63 | switch (verb & 0xf00) { | |
64 | case AC_VERB_GET_STREAM_FORMAT: | |
65 | case AC_VERB_GET_AMP_GAIN_MUTE: | |
66 | return true; | |
67 | case 0xf00: | |
68 | break; | |
69 | default: | |
70 | return false; | |
71 | } | |
72 | ||
73 | switch (verb) { | |
74 | case AC_VERB_GET_CONNECT_SEL: | |
75 | case AC_VERB_GET_SDI_SELECT: | |
76 | case AC_VERB_GET_CONV: | |
77 | case AC_VERB_GET_PIN_WIDGET_CONTROL: | |
78 | case AC_VERB_GET_UNSOLICITED_RESPONSE: /* only as SET_UNSOLICITED_ENABLE */ | |
79 | case AC_VERB_GET_BEEP_CONTROL: | |
80 | case AC_VERB_GET_EAPD_BTLENABLE: | |
81 | case AC_VERB_GET_DIGI_CONVERT_1: | |
82 | case AC_VERB_GET_DIGI_CONVERT_2: /* only for beep control */ | |
83 | case AC_VERB_GET_VOLUME_KNOB_CONTROL: | |
84 | case AC_VERB_GET_CONFIG_DEFAULT: | |
85 | case AC_VERB_GET_GPIO_MASK: | |
86 | case AC_VERB_GET_GPIO_DIRECTION: | |
87 | case AC_VERB_GET_GPIO_DATA: /* not for volatile read */ | |
88 | case AC_VERB_GET_GPIO_WAKE_MASK: | |
89 | case AC_VERB_GET_GPIO_UNSOLICITED_RSP_MASK: | |
90 | case AC_VERB_GET_GPIO_STICKY_MASK: | |
91 | case AC_VERB_GET_CVT_CHAN_COUNT: | |
92 | return true; | |
93 | } | |
94 | ||
95 | return false; | |
96 | } | |
97 | ||
98 | static bool hda_readable_reg(struct device *dev, unsigned int reg) | |
99 | { | |
100 | unsigned int verb = get_verb(reg); | |
101 | ||
102 | switch (verb) { | |
103 | case AC_VERB_PARAMETERS: | |
104 | case AC_VERB_GET_CONNECT_LIST: | |
105 | case AC_VERB_GET_SUBSYSTEM_ID: | |
106 | return true; | |
107 | } | |
108 | ||
109 | return hda_writeable_reg(dev, reg); | |
110 | } | |
111 | ||
112 | static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) | |
113 | { | |
114 | struct hdac_device *codec = context; | |
115 | ||
116 | if (!codec_is_running(codec)) | |
117 | return -EAGAIN; | |
118 | reg |= (codec->addr << 28); | |
119 | return snd_hdac_exec_verb(codec, reg, 0, val); | |
120 | } | |
121 | ||
122 | static int hda_reg_write(void *context, unsigned int reg, unsigned int val) | |
123 | { | |
124 | struct hdac_device *codec = context; | |
125 | unsigned int verb; | |
126 | int i, bytes, err; | |
127 | ||
128 | if (!codec_is_running(codec)) | |
129 | return codec->lazy_cache ? 0 : -EAGAIN; | |
130 | ||
131 | reg &= ~0x00080000U; /* drop GET bit */ | |
132 | reg |= (codec->addr << 28); | |
133 | verb = get_verb(reg); | |
134 | ||
135 | switch (verb & 0xf00) { | |
136 | case AC_VERB_SET_AMP_GAIN_MUTE: | |
137 | verb = AC_VERB_SET_AMP_GAIN_MUTE; | |
138 | if (reg & AC_AMP_GET_LEFT) | |
139 | verb |= AC_AMP_SET_LEFT >> 8; | |
140 | else | |
141 | verb |= AC_AMP_SET_RIGHT >> 8; | |
142 | if (reg & AC_AMP_GET_OUTPUT) { | |
143 | verb |= AC_AMP_SET_OUTPUT >> 8; | |
144 | } else { | |
145 | verb |= AC_AMP_SET_INPUT >> 8; | |
146 | verb |= reg & 0xf; | |
147 | } | |
148 | break; | |
149 | } | |
150 | ||
151 | switch (verb) { | |
152 | case AC_VERB_SET_DIGI_CONVERT_1: | |
153 | bytes = 2; | |
154 | break; | |
155 | case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0: | |
156 | bytes = 4; | |
157 | break; | |
158 | default: | |
159 | bytes = 1; | |
160 | break; | |
161 | } | |
162 | ||
163 | for (i = 0; i < bytes; i++) { | |
164 | reg &= ~0xfffff; | |
165 | reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff); | |
166 | err = snd_hdac_exec_verb(codec, reg, 0, NULL); | |
167 | if (err < 0) | |
168 | return err; | |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static const struct regmap_config hda_regmap_cfg = { | |
175 | .name = "hdaudio", | |
176 | .reg_bits = 32, | |
177 | .val_bits = 32, | |
178 | .max_register = 0xfffffff, | |
179 | .writeable_reg = hda_writeable_reg, | |
180 | .readable_reg = hda_readable_reg, | |
181 | .volatile_reg = hda_volatile_reg, | |
182 | .cache_type = REGCACHE_RBTREE, | |
183 | .reg_read = hda_reg_read, | |
184 | .reg_write = hda_reg_write, | |
185 | }; | |
186 | ||
187 | int snd_hdac_regmap_init(struct hdac_device *codec) | |
188 | { | |
189 | struct regmap *regmap; | |
190 | ||
191 | regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg); | |
192 | if (IS_ERR(regmap)) | |
193 | return PTR_ERR(regmap); | |
194 | codec->regmap = regmap; | |
195 | return 0; | |
196 | } | |
197 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_init); | |
198 | ||
199 | void snd_hdac_regmap_exit(struct hdac_device *codec) | |
200 | { | |
201 | if (codec->regmap) { | |
202 | regmap_exit(codec->regmap); | |
203 | codec->regmap = NULL; | |
204 | } | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit); | |
207 | ||
208 | /* | |
209 | * helper functions | |
210 | */ | |
211 | ||
212 | /* write a pseudo-register value (w/o power sequence) */ | |
213 | static int reg_raw_write(struct hdac_device *codec, unsigned int reg, | |
214 | unsigned int val) | |
215 | { | |
216 | if (!codec->regmap) | |
217 | return hda_reg_write(codec, reg, val); | |
218 | else | |
219 | return regmap_write(codec->regmap, reg, val); | |
220 | } | |
221 | ||
222 | /** | |
223 | * snd_hdac_regmap_write_raw - write a pseudo register with power mgmt | |
224 | * @codec: the codec object | |
225 | * @reg: pseudo register | |
226 | * @val: value to write | |
227 | * | |
228 | * Returns zero if successful or a negative error code. | |
229 | */ | |
230 | int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg, | |
231 | unsigned int val) | |
232 | { | |
233 | int err; | |
234 | ||
235 | err = reg_raw_write(codec, reg, val); | |
236 | if (err == -EAGAIN) { | |
237 | snd_hdac_power_up(codec); | |
238 | err = reg_raw_write(codec, reg, val); | |
239 | snd_hdac_power_down(codec); | |
240 | } | |
241 | return err; | |
242 | } | |
243 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw); | |
244 | ||
245 | static int reg_raw_read(struct hdac_device *codec, unsigned int reg, | |
246 | unsigned int *val) | |
247 | { | |
248 | if (!codec->regmap) | |
249 | return hda_reg_read(codec, reg, val); | |
250 | else | |
251 | return regmap_read(codec->regmap, reg, val); | |
252 | } | |
253 | ||
254 | /** | |
255 | * snd_hdac_regmap_read_raw - read a pseudo register with power mgmt | |
256 | * @codec: the codec object | |
257 | * @reg: pseudo register | |
258 | * @val: pointer to store the read value | |
259 | * | |
260 | * Returns zero if successful or a negative error code. | |
261 | */ | |
262 | int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, | |
263 | unsigned int *val) | |
264 | { | |
265 | int err; | |
266 | ||
267 | err = reg_raw_read(codec, reg, val); | |
268 | if (err == -EAGAIN) { | |
269 | snd_hdac_power_up(codec); | |
270 | err = reg_raw_read(codec, reg, val); | |
271 | snd_hdac_power_down(codec); | |
272 | } | |
273 | return err; | |
274 | } | |
275 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw); | |
276 | ||
277 | /** | |
278 | * snd_hdac_regmap_update_raw - update a pseudo register with power mgmt | |
279 | * @codec: the codec object | |
280 | * @reg: pseudo register | |
281 | * @mask: bit mask to udpate | |
282 | * @val: value to update | |
283 | * | |
284 | * Returns zero if successful or a negative error code. | |
285 | */ | |
286 | int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg, | |
287 | unsigned int mask, unsigned int val) | |
288 | { | |
289 | unsigned int orig; | |
290 | int err; | |
291 | ||
292 | val &= mask; | |
293 | err = snd_hdac_regmap_read_raw(codec, reg, &orig); | |
294 | if (err < 0) | |
295 | return err; | |
296 | val |= orig & ~mask; | |
297 | if (val == orig) | |
298 | return 0; | |
299 | err = snd_hdac_regmap_write_raw(codec, reg, val); | |
300 | if (err < 0) | |
301 | return err; | |
302 | return 1; | |
303 | } | |
304 | EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw); |