This source file includes following definitions.
- rt5514_spi_copy_work
- rt5514_schedule_copy
- rt5514_spi_irq
- rt5514_spi_pcm_open
- rt5514_spi_hw_params
- rt5514_spi_hw_free
- rt5514_spi_pcm_pointer
- rt5514_spi_pcm_probe
- rt5514_spi_burst_read
- rt5514_spi_burst_write
- rt5514_spi_probe
- rt5514_suspend
- rt5514_resume
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9 #include <linux/module.h>
10 #include <linux/input.h>
11 #include <linux/spi/spi.h>
12 #include <linux/device.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/slab.h>
18 #include <linux/gpio.h>
19 #include <linux/sched.h>
20 #include <linux/uaccess.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/pm_qos.h>
23 #include <linux/sysfs.h>
24 #include <linux/clk.h>
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
28 #include <sound/soc.h>
29 #include <sound/soc-dapm.h>
30 #include <sound/initval.h>
31 #include <sound/tlv.h>
32
33 #include "rt5514-spi.h"
34
35 #define DRV_NAME "rt5514-spi"
36
37 static struct spi_device *rt5514_spi;
38
39 struct rt5514_dsp {
40 struct device *dev;
41 struct delayed_work copy_work;
42 struct mutex dma_lock;
43 struct snd_pcm_substream *substream;
44 unsigned int buf_base, buf_limit, buf_rp;
45 size_t buf_size, get_size, dma_offset;
46 };
47
48 static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
49 .info = SNDRV_PCM_INFO_MMAP |
50 SNDRV_PCM_INFO_MMAP_VALID |
51 SNDRV_PCM_INFO_INTERLEAVED,
52 .formats = SNDRV_PCM_FMTBIT_S16_LE,
53 .period_bytes_min = PAGE_SIZE,
54 .period_bytes_max = 0x20000 / 8,
55 .periods_min = 8,
56 .periods_max = 8,
57 .channels_min = 1,
58 .channels_max = 1,
59 .buffer_bytes_max = 0x20000,
60 };
61
62 static struct snd_soc_dai_driver rt5514_spi_dai = {
63 .name = "rt5514-dsp-cpu-dai",
64 .id = 0,
65 .capture = {
66 .stream_name = "DSP Capture",
67 .channels_min = 1,
68 .channels_max = 1,
69 .rates = SNDRV_PCM_RATE_16000,
70 .formats = SNDRV_PCM_FMTBIT_S16_LE,
71 },
72 };
73
74 static void rt5514_spi_copy_work(struct work_struct *work)
75 {
76 struct rt5514_dsp *rt5514_dsp =
77 container_of(work, struct rt5514_dsp, copy_work.work);
78 struct snd_pcm_runtime *runtime;
79 size_t period_bytes, truncated_bytes = 0;
80 unsigned int cur_wp, remain_data;
81 u8 buf[8];
82
83 mutex_lock(&rt5514_dsp->dma_lock);
84 if (!rt5514_dsp->substream) {
85 dev_err(rt5514_dsp->dev, "No pcm substream\n");
86 goto done;
87 }
88
89 runtime = rt5514_dsp->substream->runtime;
90 period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
91 if (!period_bytes) {
92 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
93 goto done;
94 }
95
96 if (rt5514_dsp->buf_size % period_bytes)
97 rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) *
98 period_bytes;
99
100 if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) {
101 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
102 sizeof(buf));
103 cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
104 buf[3] << 24;
105
106 if (cur_wp >= rt5514_dsp->buf_rp)
107 remain_data = (cur_wp - rt5514_dsp->buf_rp);
108 else
109 remain_data =
110 (rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) +
111 (cur_wp - rt5514_dsp->buf_base);
112
113 if (remain_data < period_bytes) {
114 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
115 goto done;
116 }
117 }
118
119 if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
120 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
121 runtime->dma_area + rt5514_dsp->dma_offset,
122 period_bytes);
123
124 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
125 rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
126 else
127 rt5514_dsp->buf_rp += period_bytes;
128 } else {
129 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
130 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
131 runtime->dma_area + rt5514_dsp->dma_offset,
132 truncated_bytes);
133
134 rt5514_spi_burst_read(rt5514_dsp->buf_base,
135 runtime->dma_area + rt5514_dsp->dma_offset +
136 truncated_bytes, period_bytes - truncated_bytes);
137
138 rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes -
139 truncated_bytes;
140 }
141
142 rt5514_dsp->get_size += period_bytes;
143 rt5514_dsp->dma_offset += period_bytes;
144 if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
145 rt5514_dsp->dma_offset = 0;
146
147 snd_pcm_period_elapsed(rt5514_dsp->substream);
148
149 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
150
151 done:
152 mutex_unlock(&rt5514_dsp->dma_lock);
153 }
154
155 static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
156 {
157 u8 buf[8];
158
159 if (!rt5514_dsp->substream)
160 return;
161
162 rt5514_dsp->get_size = 0;
163
164
165
166
167
168
169 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
170 sizeof(buf));
171 rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
172 buf[3] << 24;
173
174 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
175 sizeof(buf));
176 rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
177 buf[3] << 24;
178
179 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
180 sizeof(buf));
181 rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
182 buf[3] << 24;
183
184 if (rt5514_dsp->buf_rp % 8)
185 rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8;
186
187 rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base;
188
189 if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
190 rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
191 schedule_delayed_work(&rt5514_dsp->copy_work, 0);
192 }
193
194 static irqreturn_t rt5514_spi_irq(int irq, void *data)
195 {
196 struct rt5514_dsp *rt5514_dsp = data;
197
198 rt5514_schedule_copy(rt5514_dsp);
199
200 return IRQ_HANDLED;
201 }
202
203
204 static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
205 {
206 snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
207
208 return 0;
209 }
210
211 static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
212 struct snd_pcm_hw_params *hw_params)
213 {
214 struct snd_soc_pcm_runtime *rtd = substream->private_data;
215 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
216 struct rt5514_dsp *rt5514_dsp =
217 snd_soc_component_get_drvdata(component);
218 int ret;
219 u8 buf[8];
220
221 mutex_lock(&rt5514_dsp->dma_lock);
222 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
223 params_buffer_bytes(hw_params));
224 rt5514_dsp->substream = substream;
225 rt5514_dsp->dma_offset = 0;
226
227
228 rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf));
229 if (buf[0] & RT5514_IRQ_STATUS_BIT)
230 rt5514_schedule_copy(rt5514_dsp);
231
232 mutex_unlock(&rt5514_dsp->dma_lock);
233
234 return ret;
235 }
236
237 static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
238 {
239 struct snd_soc_pcm_runtime *rtd = substream->private_data;
240 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
241 struct rt5514_dsp *rt5514_dsp =
242 snd_soc_component_get_drvdata(component);
243
244 mutex_lock(&rt5514_dsp->dma_lock);
245 rt5514_dsp->substream = NULL;
246 mutex_unlock(&rt5514_dsp->dma_lock);
247
248 cancel_delayed_work_sync(&rt5514_dsp->copy_work);
249
250 return snd_pcm_lib_free_vmalloc_buffer(substream);
251 }
252
253 static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
254 struct snd_pcm_substream *substream)
255 {
256 struct snd_pcm_runtime *runtime = substream->runtime;
257 struct snd_soc_pcm_runtime *rtd = substream->private_data;
258 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
259 struct rt5514_dsp *rt5514_dsp =
260 snd_soc_component_get_drvdata(component);
261
262 return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
263 }
264
265 static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
266 .open = rt5514_spi_pcm_open,
267 .hw_params = rt5514_spi_hw_params,
268 .hw_free = rt5514_spi_hw_free,
269 .pointer = rt5514_spi_pcm_pointer,
270 .page = snd_pcm_lib_get_vmalloc_page,
271 };
272
273 static int rt5514_spi_pcm_probe(struct snd_soc_component *component)
274 {
275 struct rt5514_dsp *rt5514_dsp;
276 int ret;
277
278 rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp),
279 GFP_KERNEL);
280 if (!rt5514_dsp)
281 return -ENOMEM;
282
283 rt5514_dsp->dev = &rt5514_spi->dev;
284 mutex_init(&rt5514_dsp->dma_lock);
285 INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
286 snd_soc_component_set_drvdata(component, rt5514_dsp);
287
288 if (rt5514_spi->irq) {
289 ret = devm_request_threaded_irq(&rt5514_spi->dev,
290 rt5514_spi->irq, NULL, rt5514_spi_irq,
291 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
292 rt5514_dsp);
293 if (ret)
294 dev_err(&rt5514_spi->dev,
295 "%s Failed to reguest IRQ: %d\n", __func__,
296 ret);
297 else
298 device_init_wakeup(rt5514_dsp->dev, true);
299 }
300
301 return 0;
302 }
303
304 static const struct snd_soc_component_driver rt5514_spi_component = {
305 .name = DRV_NAME,
306 .probe = rt5514_spi_pcm_probe,
307 .ops = &rt5514_spi_pcm_ops,
308 };
309
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312
313
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316
317
318
319 int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
320 {
321 u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
322 int status;
323 u8 write_buf[8];
324 unsigned int i, end, offset = 0;
325
326 struct spi_message message;
327 struct spi_transfer x[3];
328
329 while (offset < len) {
330 if (offset + RT5514_SPI_BUF_LEN <= len)
331 end = RT5514_SPI_BUF_LEN;
332 else
333 end = len % RT5514_SPI_BUF_LEN;
334
335 write_buf[0] = spi_cmd;
336 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
337 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
338 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
339 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
340
341 spi_message_init(&message);
342 memset(x, 0, sizeof(x));
343
344 x[0].len = 5;
345 x[0].tx_buf = write_buf;
346 spi_message_add_tail(&x[0], &message);
347
348 x[1].len = 4;
349 x[1].tx_buf = write_buf;
350 spi_message_add_tail(&x[1], &message);
351
352 x[2].len = end;
353 x[2].rx_buf = rxbuf + offset;
354 spi_message_add_tail(&x[2], &message);
355
356 status = spi_sync(rt5514_spi, &message);
357
358 if (status)
359 return false;
360
361 offset += RT5514_SPI_BUF_LEN;
362 }
363
364 for (i = 0; i < len; i += 8) {
365 write_buf[0] = rxbuf[i + 0];
366 write_buf[1] = rxbuf[i + 1];
367 write_buf[2] = rxbuf[i + 2];
368 write_buf[3] = rxbuf[i + 3];
369 write_buf[4] = rxbuf[i + 4];
370 write_buf[5] = rxbuf[i + 5];
371 write_buf[6] = rxbuf[i + 6];
372 write_buf[7] = rxbuf[i + 7];
373
374 rxbuf[i + 0] = write_buf[7];
375 rxbuf[i + 1] = write_buf[6];
376 rxbuf[i + 2] = write_buf[5];
377 rxbuf[i + 3] = write_buf[4];
378 rxbuf[i + 4] = write_buf[3];
379 rxbuf[i + 5] = write_buf[2];
380 rxbuf[i + 6] = write_buf[1];
381 rxbuf[i + 7] = write_buf[0];
382 }
383
384 return true;
385 }
386 EXPORT_SYMBOL_GPL(rt5514_spi_burst_read);
387
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394
395
396
397 int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
398 {
399 u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
400 u8 *write_buf;
401 unsigned int i, end, offset = 0;
402
403 write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
404
405 if (write_buf == NULL)
406 return -ENOMEM;
407
408 while (offset < len) {
409 if (offset + RT5514_SPI_BUF_LEN <= len)
410 end = RT5514_SPI_BUF_LEN;
411 else
412 end = len % RT5514_SPI_BUF_LEN;
413
414 write_buf[0] = spi_cmd;
415 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
416 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
417 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
418 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
419
420 for (i = 0; i < end; i += 8) {
421 write_buf[i + 12] = txbuf[offset + i + 0];
422 write_buf[i + 11] = txbuf[offset + i + 1];
423 write_buf[i + 10] = txbuf[offset + i + 2];
424 write_buf[i + 9] = txbuf[offset + i + 3];
425 write_buf[i + 8] = txbuf[offset + i + 4];
426 write_buf[i + 7] = txbuf[offset + i + 5];
427 write_buf[i + 6] = txbuf[offset + i + 6];
428 write_buf[i + 5] = txbuf[offset + i + 7];
429 }
430
431 write_buf[end + 5] = spi_cmd;
432
433 spi_write(rt5514_spi, write_buf, end + 6);
434
435 offset += RT5514_SPI_BUF_LEN;
436 }
437
438 kfree(write_buf);
439
440 return 0;
441 }
442 EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
443
444 static int rt5514_spi_probe(struct spi_device *spi)
445 {
446 int ret;
447
448 rt5514_spi = spi;
449
450 ret = devm_snd_soc_register_component(&spi->dev,
451 &rt5514_spi_component,
452 &rt5514_spi_dai, 1);
453 if (ret < 0) {
454 dev_err(&spi->dev, "Failed to register component.\n");
455 return ret;
456 }
457
458 return 0;
459 }
460
461 static int __maybe_unused rt5514_suspend(struct device *dev)
462 {
463 int irq = to_spi_device(dev)->irq;
464
465 if (device_may_wakeup(dev))
466 enable_irq_wake(irq);
467
468 return 0;
469 }
470
471 static int __maybe_unused rt5514_resume(struct device *dev)
472 {
473 struct rt5514_dsp *rt5514_dsp = dev_get_drvdata(dev);
474 int irq = to_spi_device(dev)->irq;
475 u8 buf[8];
476
477 if (device_may_wakeup(dev))
478 disable_irq_wake(irq);
479
480 if (rt5514_dsp) {
481 if (rt5514_dsp->substream) {
482 rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf,
483 sizeof(buf));
484 if (buf[0] & RT5514_IRQ_STATUS_BIT)
485 rt5514_schedule_copy(rt5514_dsp);
486 }
487 }
488
489 return 0;
490 }
491
492 static const struct dev_pm_ops rt5514_pm_ops = {
493 SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
494 };
495
496 static const struct of_device_id rt5514_of_match[] = {
497 { .compatible = "realtek,rt5514", },
498 {},
499 };
500 MODULE_DEVICE_TABLE(of, rt5514_of_match);
501
502 static struct spi_driver rt5514_spi_driver = {
503 .driver = {
504 .name = "rt5514",
505 .pm = &rt5514_pm_ops,
506 .of_match_table = of_match_ptr(rt5514_of_match),
507 },
508 .probe = rt5514_spi_probe,
509 };
510 module_spi_driver(rt5514_spi_driver);
511
512 MODULE_DESCRIPTION("RT5514 SPI driver");
513 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
514 MODULE_LICENSE("GPL v2");