1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2019 Google, Inc.
4 *
5 * ChromeOS Embedded Controller codec driver.
6 *
7 * This driver uses the cros-ec interface to communicate with the ChromeOS
8 * EC for audio function.
9 */
10
11 #include <crypto/sha2.h>
12 #include <linux/acpi.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/io.h>
16 #include <linux/jiffies.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/of_address.h>
21 #include <linux/platform_data/cros_ec_commands.h>
22 #include <linux/platform_data/cros_ec_proto.h>
23 #include <linux/platform_device.h>
24 #include <sound/pcm.h>
25 #include <sound/pcm_params.h>
26 #include <sound/soc.h>
27 #include <sound/tlv.h>
28
29 struct cros_ec_codec_priv {
30 struct device *dev;
31 struct cros_ec_device *ec_device;
32
33 /* common */
34 uint32_t ec_capabilities;
35
36 uint64_t ec_shm_addr;
37 uint32_t ec_shm_len;
38
39 uint64_t ap_shm_phys_addr;
40 uint32_t ap_shm_len;
41 uint64_t ap_shm_addr;
42 uint64_t ap_shm_last_alloc;
43
44 /* DMIC */
45 atomic_t dmic_probed;
46
47 /* I2S_RX */
48 uint32_t i2s_rx_bclk_ratio;
49
50 /* WoV */
51 bool wov_enabled;
52 uint8_t *wov_audio_shm_p;
53 uint32_t wov_audio_shm_len;
54 uint8_t wov_audio_shm_type;
55 uint8_t *wov_lang_shm_p;
56 uint32_t wov_lang_shm_len;
57 uint8_t wov_lang_shm_type;
58
59 struct mutex wov_dma_lock;
60 uint8_t wov_buf[64000];
61 uint32_t wov_rp, wov_wp;
62 size_t wov_dma_offset;
63 bool wov_burst_read;
64 struct snd_pcm_substream *wov_substream;
65 struct delayed_work wov_copy_work;
66 struct notifier_block wov_notifier;
67 };
68
ec_codec_capable(struct cros_ec_codec_priv * priv,uint8_t cap)69 static int ec_codec_capable(struct cros_ec_codec_priv *priv, uint8_t cap)
70 {
71 return priv->ec_capabilities & BIT(cap);
72 }
73
send_ec_host_command(struct cros_ec_device * ec_dev,uint32_t cmd,uint8_t * out,size_t outsize,uint8_t * in,size_t insize)74 static int send_ec_host_command(struct cros_ec_device *ec_dev, uint32_t cmd,
75 uint8_t *out, size_t outsize,
76 uint8_t *in, size_t insize)
77 {
78 int ret;
79 struct cros_ec_command *msg;
80
81 msg = kmalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
82 if (!msg)
83 return -ENOMEM;
84
85 msg->version = 0;
86 msg->command = cmd;
87 msg->outsize = outsize;
88 msg->insize = insize;
89
90 if (outsize)
91 memcpy(msg->data, out, outsize);
92
93 ret = cros_ec_cmd_xfer_status(ec_dev, msg);
94 if (ret < 0)
95 goto error;
96
97 if (in && insize)
98 memcpy(in, msg->data, insize);
99
100 ret = 0;
101 error:
102 kfree(msg);
103 return ret;
104 }
105
dmic_get_gain(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)106 static int dmic_get_gain(struct snd_kcontrol *kcontrol,
107 struct snd_ctl_elem_value *ucontrol)
108 {
109 struct snd_soc_component *component =
110 snd_soc_kcontrol_component(kcontrol);
111 struct cros_ec_codec_priv *priv =
112 snd_soc_component_get_drvdata(component);
113 struct ec_param_ec_codec_dmic p;
114 struct ec_response_ec_codec_dmic_get_gain_idx r;
115 int ret;
116
117 p.cmd = EC_CODEC_DMIC_GET_GAIN_IDX;
118 p.get_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_0;
119 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
120 (uint8_t *)&p, sizeof(p),
121 (uint8_t *)&r, sizeof(r));
122 if (ret < 0)
123 return ret;
124 ucontrol->value.integer.value[0] = r.gain;
125
126 p.cmd = EC_CODEC_DMIC_GET_GAIN_IDX;
127 p.get_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_1;
128 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
129 (uint8_t *)&p, sizeof(p),
130 (uint8_t *)&r, sizeof(r));
131 if (ret < 0)
132 return ret;
133 ucontrol->value.integer.value[1] = r.gain;
134
135 return 0;
136 }
137
dmic_put_gain(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)138 static int dmic_put_gain(struct snd_kcontrol *kcontrol,
139 struct snd_ctl_elem_value *ucontrol)
140 {
141 struct snd_soc_component *component =
142 snd_soc_kcontrol_component(kcontrol);
143 struct cros_ec_codec_priv *priv =
144 snd_soc_component_get_drvdata(component);
145 struct soc_mixer_control *control =
146 (struct soc_mixer_control *)kcontrol->private_value;
147 int max_dmic_gain = control->max;
148 int left = ucontrol->value.integer.value[0];
149 int right = ucontrol->value.integer.value[1];
150 struct ec_param_ec_codec_dmic p;
151 int ret;
152
153 if (left > max_dmic_gain || right > max_dmic_gain)
154 return -EINVAL;
155
156 dev_dbg(component->dev, "set mic gain to %u, %u\n", left, right);
157
158 p.cmd = EC_CODEC_DMIC_SET_GAIN_IDX;
159 p.set_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_0;
160 p.set_gain_idx_param.gain = left;
161 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
162 (uint8_t *)&p, sizeof(p), NULL, 0);
163 if (ret < 0)
164 return ret;
165
166 p.cmd = EC_CODEC_DMIC_SET_GAIN_IDX;
167 p.set_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_1;
168 p.set_gain_idx_param.gain = right;
169 return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
170 (uint8_t *)&p, sizeof(p), NULL, 0);
171 }
172
173 static const DECLARE_TLV_DB_SCALE(dmic_gain_tlv, 0, 100, 0);
174
175 enum {
176 DMIC_CTL_GAIN = 0,
177 };
178
179 static struct snd_kcontrol_new dmic_controls[] = {
180 [DMIC_CTL_GAIN] =
181 SOC_DOUBLE_EXT_TLV("EC Mic Gain", SND_SOC_NOPM, SND_SOC_NOPM,
182 0, 0, 0, dmic_get_gain, dmic_put_gain,
183 dmic_gain_tlv),
184 };
185
dmic_probe(struct snd_soc_component * component)186 static int dmic_probe(struct snd_soc_component *component)
187 {
188 struct cros_ec_codec_priv *priv =
189 snd_soc_component_get_drvdata(component);
190 struct device *dev = priv->dev;
191 struct soc_mixer_control *control;
192 struct ec_param_ec_codec_dmic p;
193 struct ec_response_ec_codec_dmic_get_max_gain r;
194 int ret;
195
196 if (!atomic_add_unless(&priv->dmic_probed, 1, 1))
197 return 0;
198
199 p.cmd = EC_CODEC_DMIC_GET_MAX_GAIN;
200
201 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
202 (uint8_t *)&p, sizeof(p),
203 (uint8_t *)&r, sizeof(r));
204 if (ret < 0) {
205 dev_warn(dev, "get_max_gain() unsupported\n");
206 return 0;
207 }
208
209 dev_dbg(dev, "max gain = %d\n", r.max_gain);
210
211 control = (struct soc_mixer_control *)
212 dmic_controls[DMIC_CTL_GAIN].private_value;
213 control->max = r.max_gain;
214 control->platform_max = r.max_gain;
215
216 return snd_soc_add_component_controls(component,
217 &dmic_controls[DMIC_CTL_GAIN], 1);
218 }
219
i2s_rx_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)220 static int i2s_rx_hw_params(struct snd_pcm_substream *substream,
221 struct snd_pcm_hw_params *params,
222 struct snd_soc_dai *dai)
223 {
224 struct snd_soc_component *component = dai->component;
225 struct cros_ec_codec_priv *priv =
226 snd_soc_component_get_drvdata(component);
227 struct ec_param_ec_codec_i2s_rx p;
228 enum ec_codec_i2s_rx_sample_depth depth;
229 uint32_t bclk;
230 int ret;
231
232 if (params_rate(params) != 48000)
233 return -EINVAL;
234
235 switch (params_width(params)) {
236 case 16:
237 depth = EC_CODEC_I2S_RX_SAMPLE_DEPTH_16;
238 break;
239 case 24:
240 depth = EC_CODEC_I2S_RX_SAMPLE_DEPTH_24;
241 break;
242 default:
243 return -EINVAL;
244 }
245
246 dev_dbg(component->dev, "set depth to %u\n", depth);
247
248 p.cmd = EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH;
249 p.set_sample_depth_param.depth = depth;
250 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
251 (uint8_t *)&p, sizeof(p), NULL, 0);
252 if (ret < 0)
253 return ret;
254
255 if (priv->i2s_rx_bclk_ratio)
256 bclk = params_rate(params) * priv->i2s_rx_bclk_ratio;
257 else
258 bclk = snd_soc_params_to_bclk(params);
259
260 dev_dbg(component->dev, "set bclk to %u\n", bclk);
261
262 p.cmd = EC_CODEC_I2S_RX_SET_BCLK;
263 p.set_bclk_param.bclk = bclk;
264 return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
265 (uint8_t *)&p, sizeof(p), NULL, 0);
266 }
267
i2s_rx_set_bclk_ratio(struct snd_soc_dai * dai,unsigned int ratio)268 static int i2s_rx_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
269 {
270 struct snd_soc_component *component = dai->component;
271 struct cros_ec_codec_priv *priv =
272 snd_soc_component_get_drvdata(component);
273
274 priv->i2s_rx_bclk_ratio = ratio;
275 return 0;
276 }
277
i2s_rx_set_fmt(struct snd_soc_dai * dai,unsigned int fmt)278 static int i2s_rx_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
279 {
280 struct snd_soc_component *component = dai->component;
281 struct cros_ec_codec_priv *priv =
282 snd_soc_component_get_drvdata(component);
283 struct ec_param_ec_codec_i2s_rx p;
284 enum ec_codec_i2s_rx_daifmt daifmt;
285
286 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
287 case SND_SOC_DAIFMT_CBC_CFC:
288 break;
289 default:
290 return -EINVAL;
291 }
292
293 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
294 case SND_SOC_DAIFMT_NB_NF:
295 break;
296 default:
297 return -EINVAL;
298 }
299
300 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
301 case SND_SOC_DAIFMT_I2S:
302 daifmt = EC_CODEC_I2S_RX_DAIFMT_I2S;
303 break;
304 case SND_SOC_DAIFMT_RIGHT_J:
305 daifmt = EC_CODEC_I2S_RX_DAIFMT_RIGHT_J;
306 break;
307 case SND_SOC_DAIFMT_LEFT_J:
308 daifmt = EC_CODEC_I2S_RX_DAIFMT_LEFT_J;
309 break;
310 default:
311 return -EINVAL;
312 }
313
314 dev_dbg(component->dev, "set format to %u\n", daifmt);
315
316 p.cmd = EC_CODEC_I2S_RX_SET_DAIFMT;
317 p.set_daifmt_param.daifmt = daifmt;
318 return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
319 (uint8_t *)&p, sizeof(p), NULL, 0);
320 }
321
322 static const struct snd_soc_dai_ops i2s_rx_dai_ops = {
323 .hw_params = i2s_rx_hw_params,
324 .set_fmt = i2s_rx_set_fmt,
325 .set_bclk_ratio = i2s_rx_set_bclk_ratio,
326 };
327
i2s_rx_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)328 static int i2s_rx_event(struct snd_soc_dapm_widget *w,
329 struct snd_kcontrol *kcontrol, int event)
330 {
331 struct snd_soc_component *component =
332 snd_soc_dapm_to_component(w->dapm);
333 struct cros_ec_codec_priv *priv =
334 snd_soc_component_get_drvdata(component);
335 struct ec_param_ec_codec_i2s_rx p = {};
336
337 switch (event) {
338 case SND_SOC_DAPM_PRE_PMU:
339 dev_dbg(component->dev, "enable I2S RX\n");
340 p.cmd = EC_CODEC_I2S_RX_ENABLE;
341 break;
342 case SND_SOC_DAPM_PRE_PMD:
343 dev_dbg(component->dev, "disable I2S RX\n");
344 p.cmd = EC_CODEC_I2S_RX_DISABLE;
345 break;
346 default:
347 return 0;
348 }
349
350 return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
351 (uint8_t *)&p, sizeof(p), NULL, 0);
352 }
353
354 static struct snd_soc_dapm_widget i2s_rx_dapm_widgets[] = {
355 SND_SOC_DAPM_INPUT("DMIC"),
356 SND_SOC_DAPM_SUPPLY("I2S RX Enable", SND_SOC_NOPM, 0, 0, i2s_rx_event,
357 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_PRE_PMD),
358 SND_SOC_DAPM_AIF_OUT("I2S RX", "I2S Capture", 0, SND_SOC_NOPM, 0, 0),
359 };
360
361 static struct snd_soc_dapm_route i2s_rx_dapm_routes[] = {
362 {"I2S RX", NULL, "DMIC"},
363 {"I2S RX", NULL, "I2S RX Enable"},
364 };
365
366 static struct snd_soc_dai_driver i2s_rx_dai_driver = {
367 .name = "EC Codec I2S RX",
368 .capture = {
369 .stream_name = "I2S Capture",
370 .channels_min = 2,
371 .channels_max = 2,
372 .rates = SNDRV_PCM_RATE_48000,
373 .formats = SNDRV_PCM_FMTBIT_S16_LE |
374 SNDRV_PCM_FMTBIT_S24_LE,
375 },
376 .ops = &i2s_rx_dai_ops,
377 };
378
i2s_rx_probe(struct snd_soc_component * component)379 static int i2s_rx_probe(struct snd_soc_component *component)
380 {
381 return dmic_probe(component);
382 }
383
384 static const struct snd_soc_component_driver i2s_rx_component_driver = {
385 .probe = i2s_rx_probe,
386 .dapm_widgets = i2s_rx_dapm_widgets,
387 .num_dapm_widgets = ARRAY_SIZE(i2s_rx_dapm_widgets),
388 .dapm_routes = i2s_rx_dapm_routes,
389 .num_dapm_routes = ARRAY_SIZE(i2s_rx_dapm_routes),
390 .endianness = 1,
391 };
392
wov_map_shm(struct cros_ec_codec_priv * priv,uint8_t shm_id,uint32_t * len,uint8_t * type)393 static void *wov_map_shm(struct cros_ec_codec_priv *priv,
394 uint8_t shm_id, uint32_t *len, uint8_t *type)
395 {
396 struct ec_param_ec_codec p;
397 struct ec_response_ec_codec_get_shm_addr r;
398 uint32_t req, offset;
399
400 p.cmd = EC_CODEC_GET_SHM_ADDR;
401 p.get_shm_addr_param.shm_id = shm_id;
402 if (send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC,
403 (uint8_t *)&p, sizeof(p),
404 (uint8_t *)&r, sizeof(r)) < 0) {
405 dev_err(priv->dev, "failed to EC_CODEC_GET_SHM_ADDR\n");
406 return NULL;
407 }
408
409 dev_dbg(priv->dev, "phys_addr=%#llx, len=%#x\n", r.phys_addr, r.len);
410
411 *len = r.len;
412 *type = r.type;
413
414 switch (r.type) {
415 case EC_CODEC_SHM_TYPE_EC_RAM:
416 return (void __force *)devm_ioremap_wc(priv->dev,
417 r.phys_addr + priv->ec_shm_addr, r.len);
418 case EC_CODEC_SHM_TYPE_SYSTEM_RAM:
419 if (r.phys_addr) {
420 dev_err(priv->dev, "unknown status\n");
421 return NULL;
422 }
423
424 req = round_up(r.len, PAGE_SIZE);
425 dev_dbg(priv->dev, "round up from %u to %u\n", r.len, req);
426
427 if (priv->ap_shm_last_alloc + req >
428 priv->ap_shm_phys_addr + priv->ap_shm_len) {
429 dev_err(priv->dev, "insufficient space for AP SHM\n");
430 return NULL;
431 }
432
433 dev_dbg(priv->dev, "alloc AP SHM addr=%#llx, len=%#x\n",
434 priv->ap_shm_last_alloc, req);
435
436 p.cmd = EC_CODEC_SET_SHM_ADDR;
437 p.set_shm_addr_param.phys_addr = priv->ap_shm_last_alloc;
438 p.set_shm_addr_param.len = req;
439 p.set_shm_addr_param.shm_id = shm_id;
440 if (send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC,
441 (uint8_t *)&p, sizeof(p),
442 NULL, 0) < 0) {
443 dev_err(priv->dev, "failed to EC_CODEC_SET_SHM_ADDR\n");
444 return NULL;
445 }
446
447 /*
448 * Note: EC codec only requests for `r.len' but we allocate
449 * round up PAGE_SIZE `req'.
450 */
451 offset = priv->ap_shm_last_alloc - priv->ap_shm_phys_addr;
452 priv->ap_shm_last_alloc += req;
453
454 return (void *)(uintptr_t)(priv->ap_shm_addr + offset);
455 default:
456 return NULL;
457 }
458 }
459
wov_queue_full(struct cros_ec_codec_priv * priv)460 static bool wov_queue_full(struct cros_ec_codec_priv *priv)
461 {
462 return ((priv->wov_wp + 1) % sizeof(priv->wov_buf)) == priv->wov_rp;
463 }
464
wov_queue_size(struct cros_ec_codec_priv * priv)465 static size_t wov_queue_size(struct cros_ec_codec_priv *priv)
466 {
467 if (priv->wov_wp >= priv->wov_rp)
468 return priv->wov_wp - priv->wov_rp;
469 else
470 return sizeof(priv->wov_buf) - priv->wov_rp + priv->wov_wp;
471 }
472
wov_queue_dequeue(struct cros_ec_codec_priv * priv,size_t len)473 static void wov_queue_dequeue(struct cros_ec_codec_priv *priv, size_t len)
474 {
475 struct snd_pcm_runtime *runtime = priv->wov_substream->runtime;
476 size_t req;
477
478 while (len) {
479 req = min(len, runtime->dma_bytes - priv->wov_dma_offset);
480 if (priv->wov_wp >= priv->wov_rp)
481 req = min(req, (size_t)priv->wov_wp - priv->wov_rp);
482 else
483 req = min(req, sizeof(priv->wov_buf) - priv->wov_rp);
484
485 memcpy(runtime->dma_area + priv->wov_dma_offset,
486 priv->wov_buf + priv->wov_rp, req);
487
488 priv->wov_dma_offset += req;
489 if (priv->wov_dma_offset == runtime->dma_bytes)
490 priv->wov_dma_offset = 0;
491
492 priv->wov_rp += req;
493 if (priv->wov_rp == sizeof(priv->wov_buf))
494 priv->wov_rp = 0;
495
496 len -= req;
497 }
498
499 snd_pcm_period_elapsed(priv->wov_substream);
500 }
501
wov_queue_try_dequeue(struct cros_ec_codec_priv * priv)502 static void wov_queue_try_dequeue(struct cros_ec_codec_priv *priv)
503 {
504 size_t period_bytes = snd_pcm_lib_period_bytes(priv->wov_substream);
505
506 while (period_bytes && wov_queue_size(priv) >= period_bytes) {
507 wov_queue_dequeue(priv, period_bytes);
508 period_bytes = snd_pcm_lib_period_bytes(priv->wov_substream);
509 }
510 }
511
wov_queue_enqueue(struct cros_ec_codec_priv * priv,uint8_t * addr,size_t len,bool iomem)512 static void wov_queue_enqueue(struct cros_ec_codec_priv *priv,
513 uint8_t *addr, size_t len, bool iomem)
514 {
515 size_t req;
516
517 while (len) {
518 if (wov_queue_full(priv)) {
519 wov_queue_try_dequeue(priv);
520
521 if (wov_queue_full(priv)) {
522 dev_err(priv->dev, "overrun detected\n");
523 return;
524 }
525 }
526
527 if (priv->wov_wp >= priv->wov_rp)
528 req = sizeof(priv->wov_buf) - priv->wov_wp;
529 else
530 /* Note: waste 1-byte to differentiate full and empty */
531 req = priv->wov_rp - priv->wov_wp - 1;
532 req = min(req, len);
533
534 if (iomem)
535 memcpy_fromio(priv->wov_buf + priv->wov_wp,
536 (void __force __iomem *)addr, req);
537 else
538 memcpy(priv->wov_buf + priv->wov_wp, addr, req);
539
540 priv->wov_wp += req;
541 if (priv->wov_wp == sizeof(priv->wov_buf))
542 priv->wov_wp = 0;
543
544 addr += req;
545 len -= req;
546 }
547
548 wov_queue_try_dequeue(priv);
549 }
550
wov_read_audio_shm(struct cros_ec_codec_priv * priv)551 static int wov_read_audio_shm(struct cros_ec_codec_priv *priv)
552 {
553 struct ec_param_ec_codec_wov p;
554 struct ec_response_ec_codec_wov_read_audio_shm r;
555 int ret;
556
557 p.cmd = EC_CODEC_WOV_READ_AUDIO_SHM;
558 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
559 (uint8_t *)&p, sizeof(p),
560 (uint8_t *)&r, sizeof(r));
561 if (ret) {
562 dev_err(priv->dev, "failed to EC_CODEC_WOV_READ_AUDIO_SHM\n");
563 return ret;
564 }
565
566 if (!r.len)
567 dev_dbg(priv->dev, "no data, sleep\n");
568 else
569 wov_queue_enqueue(priv, priv->wov_audio_shm_p + r.offset, r.len,
570 priv->wov_audio_shm_type == EC_CODEC_SHM_TYPE_EC_RAM);
571 return -EAGAIN;
572 }
573
wov_read_audio(struct cros_ec_codec_priv * priv)574 static int wov_read_audio(struct cros_ec_codec_priv *priv)
575 {
576 struct ec_param_ec_codec_wov p;
577 struct ec_response_ec_codec_wov_read_audio r;
578 int remain = priv->wov_burst_read ? 16000 : 320;
579 int ret;
580
581 while (remain >= 0) {
582 p.cmd = EC_CODEC_WOV_READ_AUDIO;
583 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
584 (uint8_t *)&p, sizeof(p),
585 (uint8_t *)&r, sizeof(r));
586 if (ret) {
587 dev_err(priv->dev,
588 "failed to EC_CODEC_WOV_READ_AUDIO\n");
589 return ret;
590 }
591
592 if (!r.len) {
593 dev_dbg(priv->dev, "no data, sleep\n");
594 priv->wov_burst_read = false;
595 break;
596 }
597
598 wov_queue_enqueue(priv, r.buf, r.len, false);
599 remain -= r.len;
600 }
601
602 return -EAGAIN;
603 }
604
wov_copy_work(struct work_struct * w)605 static void wov_copy_work(struct work_struct *w)
606 {
607 struct cros_ec_codec_priv *priv =
608 container_of(w, struct cros_ec_codec_priv, wov_copy_work.work);
609 int ret;
610
611 mutex_lock(&priv->wov_dma_lock);
612 if (!priv->wov_substream) {
613 dev_warn(priv->dev, "no pcm substream\n");
614 goto leave;
615 }
616
617 if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_AUDIO_SHM))
618 ret = wov_read_audio_shm(priv);
619 else
620 ret = wov_read_audio(priv);
621
622 if (ret == -EAGAIN)
623 schedule_delayed_work(&priv->wov_copy_work,
624 msecs_to_jiffies(10));
625 else if (ret)
626 dev_err(priv->dev, "failed to read audio data\n");
627 leave:
628 mutex_unlock(&priv->wov_dma_lock);
629 }
630
wov_enable_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)631 static int wov_enable_get(struct snd_kcontrol *kcontrol,
632 struct snd_ctl_elem_value *ucontrol)
633 {
634 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
635 struct cros_ec_codec_priv *priv = snd_soc_component_get_drvdata(c);
636
637 ucontrol->value.integer.value[0] = priv->wov_enabled;
638 return 0;
639 }
640
wov_enable_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)641 static int wov_enable_put(struct snd_kcontrol *kcontrol,
642 struct snd_ctl_elem_value *ucontrol)
643 {
644 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
645 struct cros_ec_codec_priv *priv = snd_soc_component_get_drvdata(c);
646 int enabled = ucontrol->value.integer.value[0];
647 struct ec_param_ec_codec_wov p;
648 int ret;
649
650 if (priv->wov_enabled != enabled) {
651 if (enabled)
652 p.cmd = EC_CODEC_WOV_ENABLE;
653 else
654 p.cmd = EC_CODEC_WOV_DISABLE;
655
656 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
657 (uint8_t *)&p, sizeof(p), NULL, 0);
658 if (ret) {
659 dev_err(priv->dev, "failed to %s wov\n",
660 enabled ? "enable" : "disable");
661 return ret;
662 }
663
664 priv->wov_enabled = enabled;
665 }
666
667 return 0;
668 }
669
wov_set_lang_shm(struct cros_ec_codec_priv * priv,uint8_t * buf,size_t size,uint8_t * digest)670 static int wov_set_lang_shm(struct cros_ec_codec_priv *priv,
671 uint8_t *buf, size_t size, uint8_t *digest)
672 {
673 struct ec_param_ec_codec_wov p;
674 struct ec_param_ec_codec_wov_set_lang_shm *pp = &p.set_lang_shm_param;
675 int ret;
676
677 if (size > priv->wov_lang_shm_len) {
678 dev_err(priv->dev, "no enough SHM size: %d\n",
679 priv->wov_lang_shm_len);
680 return -EIO;
681 }
682
683 switch (priv->wov_lang_shm_type) {
684 case EC_CODEC_SHM_TYPE_EC_RAM:
685 memcpy_toio((void __force __iomem *)priv->wov_lang_shm_p,
686 buf, size);
687 memset_io((void __force __iomem *)priv->wov_lang_shm_p + size,
688 0, priv->wov_lang_shm_len - size);
689 break;
690 case EC_CODEC_SHM_TYPE_SYSTEM_RAM:
691 memcpy(priv->wov_lang_shm_p, buf, size);
692 memset(priv->wov_lang_shm_p + size, 0,
693 priv->wov_lang_shm_len - size);
694
695 /* make sure write to memory before calling host command */
696 wmb();
697 break;
698 }
699
700 p.cmd = EC_CODEC_WOV_SET_LANG_SHM;
701 memcpy(pp->hash, digest, SHA256_DIGEST_SIZE);
702 pp->total_len = size;
703 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
704 (uint8_t *)&p, sizeof(p), NULL, 0);
705 if (ret) {
706 dev_err(priv->dev, "failed to EC_CODEC_WOV_SET_LANG_SHM\n");
707 return ret;
708 }
709
710 return 0;
711 }
712
wov_set_lang(struct cros_ec_codec_priv * priv,uint8_t * buf,size_t size,uint8_t * digest)713 static int wov_set_lang(struct cros_ec_codec_priv *priv,
714 uint8_t *buf, size_t size, uint8_t *digest)
715 {
716 struct ec_param_ec_codec_wov p;
717 struct ec_param_ec_codec_wov_set_lang *pp = &p.set_lang_param;
718 size_t i, req;
719 int ret;
720
721 for (i = 0; i < size; i += req) {
722 req = min(size - i, ARRAY_SIZE(pp->buf));
723
724 p.cmd = EC_CODEC_WOV_SET_LANG;
725 memcpy(pp->hash, digest, SHA256_DIGEST_SIZE);
726 pp->total_len = size;
727 pp->offset = i;
728 memcpy(pp->buf, buf + i, req);
729 pp->len = req;
730 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
731 (uint8_t *)&p, sizeof(p), NULL, 0);
732 if (ret) {
733 dev_err(priv->dev, "failed to EC_CODEC_WOV_SET_LANG\n");
734 return ret;
735 }
736 }
737
738 return 0;
739 }
740
wov_hotword_model_put(struct snd_kcontrol * kcontrol,const unsigned int __user * bytes,unsigned int size)741 static int wov_hotword_model_put(struct snd_kcontrol *kcontrol,
742 const unsigned int __user *bytes,
743 unsigned int size)
744 {
745 struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
746 struct cros_ec_codec_priv *priv =
747 snd_soc_component_get_drvdata(component);
748 struct ec_param_ec_codec_wov p;
749 struct ec_response_ec_codec_wov_get_lang r;
750 uint8_t digest[SHA256_DIGEST_SIZE];
751 uint8_t *buf;
752 int ret;
753
754 /* Skips the TLV header. */
755 bytes += 2;
756 size -= 8;
757
758 dev_dbg(priv->dev, "%s: size=%d\n", __func__, size);
759
760 buf = memdup_user(bytes, size);
761 if (IS_ERR(buf))
762 return PTR_ERR(buf);
763
764 sha256(buf, size, digest);
765 dev_dbg(priv->dev, "hash=%*phN\n", SHA256_DIGEST_SIZE, digest);
766
767 p.cmd = EC_CODEC_WOV_GET_LANG;
768 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
769 (uint8_t *)&p, sizeof(p),
770 (uint8_t *)&r, sizeof(r));
771 if (ret)
772 goto leave;
773
774 if (memcmp(digest, r.hash, SHA256_DIGEST_SIZE) == 0) {
775 dev_dbg(priv->dev, "not updated");
776 goto leave;
777 }
778
779 if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_LANG_SHM))
780 ret = wov_set_lang_shm(priv, buf, size, digest);
781 else
782 ret = wov_set_lang(priv, buf, size, digest);
783
784 leave:
785 kfree(buf);
786 return ret;
787 }
788
789 static struct snd_kcontrol_new wov_controls[] = {
790 SOC_SINGLE_BOOL_EXT("Wake-on-Voice Switch", 0,
791 wov_enable_get, wov_enable_put),
792 SND_SOC_BYTES_TLV("Hotword Model", 0x11000, NULL,
793 wov_hotword_model_put),
794 };
795
796 static struct snd_soc_dai_driver wov_dai_driver = {
797 .name = "Wake on Voice",
798 .capture = {
799 .stream_name = "WoV Capture",
800 .channels_min = 1,
801 .channels_max = 1,
802 .rates = SNDRV_PCM_RATE_16000,
803 .formats = SNDRV_PCM_FMTBIT_S16_LE,
804 },
805 };
806
wov_host_event(struct notifier_block * nb,unsigned long queued_during_suspend,void * notify)807 static int wov_host_event(struct notifier_block *nb,
808 unsigned long queued_during_suspend, void *notify)
809 {
810 struct cros_ec_codec_priv *priv =
811 container_of(nb, struct cros_ec_codec_priv, wov_notifier);
812 u32 host_event;
813
814 dev_dbg(priv->dev, "%s\n", __func__);
815
816 host_event = cros_ec_get_host_event(priv->ec_device);
817 if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_WOV)) {
818 schedule_delayed_work(&priv->wov_copy_work, 0);
819 return NOTIFY_OK;
820 } else {
821 return NOTIFY_DONE;
822 }
823 }
824
wov_probe(struct snd_soc_component * component)825 static int wov_probe(struct snd_soc_component *component)
826 {
827 struct cros_ec_codec_priv *priv =
828 snd_soc_component_get_drvdata(component);
829 int ret;
830
831 mutex_init(&priv->wov_dma_lock);
832 INIT_DELAYED_WORK(&priv->wov_copy_work, wov_copy_work);
833
834 priv->wov_notifier.notifier_call = wov_host_event;
835 ret = blocking_notifier_chain_register(
836 &priv->ec_device->event_notifier, &priv->wov_notifier);
837 if (ret)
838 return ret;
839
840 if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_LANG_SHM)) {
841 priv->wov_lang_shm_p = wov_map_shm(priv,
842 EC_CODEC_SHM_ID_WOV_LANG,
843 &priv->wov_lang_shm_len,
844 &priv->wov_lang_shm_type);
845 if (!priv->wov_lang_shm_p)
846 return -EFAULT;
847 }
848
849 if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_AUDIO_SHM)) {
850 priv->wov_audio_shm_p = wov_map_shm(priv,
851 EC_CODEC_SHM_ID_WOV_AUDIO,
852 &priv->wov_audio_shm_len,
853 &priv->wov_audio_shm_type);
854 if (!priv->wov_audio_shm_p)
855 return -EFAULT;
856 }
857
858 return dmic_probe(component);
859 }
860
wov_remove(struct snd_soc_component * component)861 static void wov_remove(struct snd_soc_component *component)
862 {
863 struct cros_ec_codec_priv *priv =
864 snd_soc_component_get_drvdata(component);
865
866 blocking_notifier_chain_unregister(
867 &priv->ec_device->event_notifier, &priv->wov_notifier);
868 }
869
wov_pcm_open(struct snd_soc_component * component,struct snd_pcm_substream * substream)870 static int wov_pcm_open(struct snd_soc_component *component,
871 struct snd_pcm_substream *substream)
872 {
873 static const struct snd_pcm_hardware hw_param = {
874 .info = SNDRV_PCM_INFO_MMAP |
875 SNDRV_PCM_INFO_INTERLEAVED |
876 SNDRV_PCM_INFO_MMAP_VALID,
877 .formats = SNDRV_PCM_FMTBIT_S16_LE,
878 .rates = SNDRV_PCM_RATE_16000,
879 .channels_min = 1,
880 .channels_max = 1,
881 .period_bytes_min = PAGE_SIZE,
882 .period_bytes_max = 0x20000 / 8,
883 .periods_min = 8,
884 .periods_max = 8,
885 .buffer_bytes_max = 0x20000,
886 };
887
888 return snd_soc_set_runtime_hwparams(substream, &hw_param);
889 }
890
wov_pcm_hw_params(struct snd_soc_component * component,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)891 static int wov_pcm_hw_params(struct snd_soc_component *component,
892 struct snd_pcm_substream *substream,
893 struct snd_pcm_hw_params *hw_params)
894 {
895 struct cros_ec_codec_priv *priv =
896 snd_soc_component_get_drvdata(component);
897
898 mutex_lock(&priv->wov_dma_lock);
899 priv->wov_substream = substream;
900 priv->wov_rp = priv->wov_wp = 0;
901 priv->wov_dma_offset = 0;
902 priv->wov_burst_read = true;
903 mutex_unlock(&priv->wov_dma_lock);
904
905 return 0;
906 }
907
wov_pcm_hw_free(struct snd_soc_component * component,struct snd_pcm_substream * substream)908 static int wov_pcm_hw_free(struct snd_soc_component *component,
909 struct snd_pcm_substream *substream)
910 {
911 struct cros_ec_codec_priv *priv =
912 snd_soc_component_get_drvdata(component);
913
914 mutex_lock(&priv->wov_dma_lock);
915 wov_queue_dequeue(priv, wov_queue_size(priv));
916 priv->wov_substream = NULL;
917 mutex_unlock(&priv->wov_dma_lock);
918
919 cancel_delayed_work_sync(&priv->wov_copy_work);
920
921 return 0;
922 }
923
wov_pcm_pointer(struct snd_soc_component * component,struct snd_pcm_substream * substream)924 static snd_pcm_uframes_t wov_pcm_pointer(struct snd_soc_component *component,
925 struct snd_pcm_substream *substream)
926 {
927 struct snd_pcm_runtime *runtime = substream->runtime;
928 struct cros_ec_codec_priv *priv =
929 snd_soc_component_get_drvdata(component);
930
931 return bytes_to_frames(runtime, priv->wov_dma_offset);
932 }
933
wov_pcm_new(struct snd_soc_component * component,struct snd_soc_pcm_runtime * rtd)934 static int wov_pcm_new(struct snd_soc_component *component,
935 struct snd_soc_pcm_runtime *rtd)
936 {
937 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC,
938 NULL, 0, 0);
939 return 0;
940 }
941
942 static const struct snd_soc_component_driver wov_component_driver = {
943 .probe = wov_probe,
944 .remove = wov_remove,
945 .controls = wov_controls,
946 .num_controls = ARRAY_SIZE(wov_controls),
947 .open = wov_pcm_open,
948 .hw_params = wov_pcm_hw_params,
949 .hw_free = wov_pcm_hw_free,
950 .pointer = wov_pcm_pointer,
951 .pcm_construct = wov_pcm_new,
952 };
953
cros_ec_codec_platform_probe(struct platform_device * pdev)954 static int cros_ec_codec_platform_probe(struct platform_device *pdev)
955 {
956 struct device *dev = &pdev->dev;
957 struct cros_ec_device *ec_device = dev_get_drvdata(pdev->dev.parent);
958 struct cros_ec_codec_priv *priv;
959 struct ec_param_ec_codec p;
960 struct ec_response_ec_codec_get_capabilities r;
961 int ret;
962 #ifdef CONFIG_OF
963 struct device_node *node;
964 struct resource res;
965 u64 ec_shm_size;
966 const __be32 *regaddr_p;
967 #endif
968
969 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
970 if (!priv)
971 return -ENOMEM;
972
973 #ifdef CONFIG_OF
974 regaddr_p = of_get_address(dev->of_node, 0, &ec_shm_size, NULL);
975 if (regaddr_p) {
976 priv->ec_shm_addr = of_read_number(regaddr_p, 2);
977 priv->ec_shm_len = ec_shm_size;
978
979 dev_dbg(dev, "ec_shm_addr=%#llx len=%#x\n",
980 priv->ec_shm_addr, priv->ec_shm_len);
981 }
982
983 node = of_parse_phandle(dev->of_node, "memory-region", 0);
984 if (node) {
985 ret = of_address_to_resource(node, 0, &res);
986 if (!ret) {
987 priv->ap_shm_phys_addr = res.start;
988 priv->ap_shm_len = resource_size(&res);
989 priv->ap_shm_addr =
990 (uint64_t)(uintptr_t)devm_ioremap_wc(
991 dev, priv->ap_shm_phys_addr,
992 priv->ap_shm_len);
993 priv->ap_shm_last_alloc = priv->ap_shm_phys_addr;
994
995 dev_dbg(dev, "ap_shm_phys_addr=%#llx len=%#x\n",
996 priv->ap_shm_phys_addr, priv->ap_shm_len);
997 }
998 of_node_put(node);
999 }
1000 #endif
1001
1002 priv->dev = dev;
1003 priv->ec_device = ec_device;
1004 atomic_set(&priv->dmic_probed, 0);
1005
1006 p.cmd = EC_CODEC_GET_CAPABILITIES;
1007 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC,
1008 (uint8_t *)&p, sizeof(p),
1009 (uint8_t *)&r, sizeof(r));
1010 if (ret) {
1011 dev_err(dev, "failed to EC_CODEC_GET_CAPABILITIES\n");
1012 return ret;
1013 }
1014 priv->ec_capabilities = r.capabilities;
1015
1016 /* Reset EC codec i2s rx. */
1017 p.cmd = EC_CODEC_I2S_RX_RESET;
1018 ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
1019 (uint8_t *)&p, sizeof(p), NULL, 0);
1020 if (ret == -ENOPROTOOPT) {
1021 dev_info(dev,
1022 "Missing reset command. Please update EC firmware.\n");
1023 } else if (ret) {
1024 dev_err(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret);
1025 return ret;
1026 }
1027
1028 platform_set_drvdata(pdev, priv);
1029
1030 ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,
1031 &i2s_rx_dai_driver, 1);
1032 if (ret)
1033 return ret;
1034
1035 return devm_snd_soc_register_component(dev, &wov_component_driver,
1036 &wov_dai_driver, 1);
1037 }
1038
1039 #ifdef CONFIG_OF
1040 static const struct of_device_id cros_ec_codec_of_match[] = {
1041 { .compatible = "google,cros-ec-codec" },
1042 {},
1043 };
1044 MODULE_DEVICE_TABLE(of, cros_ec_codec_of_match);
1045 #endif
1046
1047 #ifdef CONFIG_ACPI
1048 static const struct acpi_device_id cros_ec_codec_acpi_id[] = {
1049 { "GOOG0013", 0 },
1050 { }
1051 };
1052 MODULE_DEVICE_TABLE(acpi, cros_ec_codec_acpi_id);
1053 #endif
1054
1055 static struct platform_driver cros_ec_codec_platform_driver = {
1056 .driver = {
1057 .name = "cros-ec-codec",
1058 .of_match_table = of_match_ptr(cros_ec_codec_of_match),
1059 .acpi_match_table = ACPI_PTR(cros_ec_codec_acpi_id),
1060 },
1061 .probe = cros_ec_codec_platform_probe,
1062 };
1063
1064 module_platform_driver(cros_ec_codec_platform_driver);
1065
1066 MODULE_LICENSE("GPL v2");
1067 MODULE_DESCRIPTION("ChromeOS EC codec driver");
1068 MODULE_AUTHOR("Cheng-Yi Chiang <cychiang@chromium.org>");
1069 MODULE_ALIAS("platform:cros-ec-codec");
1070