13809821e1f8547c3b012fd53a6e3a3ea9f588f5
[muen/linux.git] / sound / soc / codecs / rt5514-spi.c
1 /*
2  * rt5514-spi.c  --  RT5514 SPI driver
3  *
4  * Copyright 2015 Realtek Semiconductor Corp.
5  * Author: Oder Chiou <oder_chiou@realtek.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #include <linux/module.h>
13 #include <linux/input.h>
14 #include <linux/spi/spi.h>
15 #include <linux/device.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/slab.h>
21 #include <linux/gpio.h>
22 #include <linux/sched.h>
23 #include <linux/uaccess.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_qos.h>
26 #include <linux/sysfs.h>
27 #include <linux/clk.h>
28 #include <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/soc.h>
32 #include <sound/soc-dapm.h>
33 #include <sound/initval.h>
34 #include <sound/tlv.h>
35
36 #include "rt5514-spi.h"
37
38 #define DRV_NAME "rt5514-spi"
39
40 static struct spi_device *rt5514_spi;
41
42 struct rt5514_dsp {
43         struct device *dev;
44         struct delayed_work copy_work;
45         struct mutex dma_lock;
46         struct snd_pcm_substream *substream;
47         unsigned int buf_base, buf_limit, buf_rp;
48         size_t buf_size, get_size, dma_offset;
49 };
50
51 static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
52         .info                   = SNDRV_PCM_INFO_MMAP |
53                                   SNDRV_PCM_INFO_MMAP_VALID |
54                                   SNDRV_PCM_INFO_INTERLEAVED,
55         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
56         .period_bytes_min       = PAGE_SIZE,
57         .period_bytes_max       = 0x20000 / 8,
58         .periods_min            = 8,
59         .periods_max            = 8,
60         .channels_min           = 1,
61         .channels_max           = 1,
62         .buffer_bytes_max       = 0x20000,
63 };
64
65 static struct snd_soc_dai_driver rt5514_spi_dai = {
66         .name = "rt5514-dsp-cpu-dai",
67         .id = 0,
68         .capture = {
69                 .stream_name = "DSP Capture",
70                 .channels_min = 1,
71                 .channels_max = 1,
72                 .rates = SNDRV_PCM_RATE_16000,
73                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
74         },
75 };
76
77 static void rt5514_spi_copy_work(struct work_struct *work)
78 {
79         struct rt5514_dsp *rt5514_dsp =
80                 container_of(work, struct rt5514_dsp, copy_work.work);
81         struct snd_pcm_runtime *runtime;
82         size_t period_bytes, truncated_bytes = 0;
83         unsigned int cur_wp, remain_data;
84         u8 buf[8];
85
86         mutex_lock(&rt5514_dsp->dma_lock);
87         if (!rt5514_dsp->substream) {
88                 dev_err(rt5514_dsp->dev, "No pcm substream\n");
89                 goto done;
90         }
91
92         runtime = rt5514_dsp->substream->runtime;
93         period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
94         if (!period_bytes) {
95                 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
96                 goto done;
97         }
98
99         if (rt5514_dsp->buf_size % period_bytes)
100                 rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) *
101                         period_bytes;
102
103         if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) {
104                 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
105                         sizeof(buf));
106                 cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
107                                         buf[3] << 24;
108
109                 if (cur_wp >= rt5514_dsp->buf_rp)
110                         remain_data = (cur_wp - rt5514_dsp->buf_rp);
111                 else
112                         remain_data =
113                                 (rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) +
114                                 (cur_wp - rt5514_dsp->buf_base);
115
116                 if (remain_data < period_bytes) {
117                         schedule_delayed_work(&rt5514_dsp->copy_work, 5);
118                         goto done;
119                 }
120         }
121
122         if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
123                 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
124                         runtime->dma_area + rt5514_dsp->dma_offset,
125                         period_bytes);
126
127                 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
128                         rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
129                 else
130                         rt5514_dsp->buf_rp += period_bytes;
131         } else {
132                 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
133                 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
134                         runtime->dma_area + rt5514_dsp->dma_offset,
135                         truncated_bytes);
136
137                 rt5514_spi_burst_read(rt5514_dsp->buf_base,
138                         runtime->dma_area + rt5514_dsp->dma_offset +
139                         truncated_bytes, period_bytes - truncated_bytes);
140
141                 rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes -
142                         truncated_bytes;
143         }
144
145         rt5514_dsp->get_size += period_bytes;
146         rt5514_dsp->dma_offset += period_bytes;
147         if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
148                 rt5514_dsp->dma_offset = 0;
149
150         snd_pcm_period_elapsed(rt5514_dsp->substream);
151
152         schedule_delayed_work(&rt5514_dsp->copy_work, 5);
153
154 done:
155         mutex_unlock(&rt5514_dsp->dma_lock);
156 }
157
158 static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
159 {
160         u8 buf[8];
161
162         if (!rt5514_dsp->substream)
163                 return;
164
165         rt5514_dsp->get_size = 0;
166
167         /**
168          * The address area x1800XXXX is the register address, and it cannot
169          * support spi burst read perfectly. So we use the spi burst read
170          * individually to make sure the data correctly.
171          */
172         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
173                 sizeof(buf));
174         rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
175                                 buf[3] << 24;
176
177         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
178                 sizeof(buf));
179         rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
180                                 buf[3] << 24;
181
182         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
183                 sizeof(buf));
184         rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
185                                 buf[3] << 24;
186
187         if (rt5514_dsp->buf_rp % 8)
188                 rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8;
189
190         rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base;
191
192         if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
193                 rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
194                 schedule_delayed_work(&rt5514_dsp->copy_work, 0);
195 }
196
197 static irqreturn_t rt5514_spi_irq(int irq, void *data)
198 {
199         struct rt5514_dsp *rt5514_dsp = data;
200
201         rt5514_schedule_copy(rt5514_dsp);
202
203         return IRQ_HANDLED;
204 }
205
206 /* PCM for streaming audio from the DSP buffer */
207 static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
208 {
209         snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
210
211         return 0;
212 }
213
214 static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
215                                struct snd_pcm_hw_params *hw_params)
216 {
217         struct snd_soc_pcm_runtime *rtd = substream->private_data;
218         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
219         struct rt5514_dsp *rt5514_dsp =
220                 snd_soc_component_get_drvdata(component);
221         int ret;
222         u8 buf[8];
223
224         mutex_lock(&rt5514_dsp->dma_lock);
225         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
226                         params_buffer_bytes(hw_params));
227         rt5514_dsp->substream = substream;
228         rt5514_dsp->dma_offset = 0;
229
230         /* Read IRQ status and schedule copy accordingly. */
231         rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf));
232         if (buf[0] & RT5514_IRQ_STATUS_BIT)
233                 rt5514_schedule_copy(rt5514_dsp);
234
235         mutex_unlock(&rt5514_dsp->dma_lock);
236
237         return ret;
238 }
239
240 static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
241 {
242         struct snd_soc_pcm_runtime *rtd = substream->private_data;
243         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
244         struct rt5514_dsp *rt5514_dsp =
245                 snd_soc_component_get_drvdata(component);
246
247         mutex_lock(&rt5514_dsp->dma_lock);
248         rt5514_dsp->substream = NULL;
249         mutex_unlock(&rt5514_dsp->dma_lock);
250
251         cancel_delayed_work_sync(&rt5514_dsp->copy_work);
252
253         return snd_pcm_lib_free_vmalloc_buffer(substream);
254 }
255
256 static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
257                 struct snd_pcm_substream *substream)
258 {
259         struct snd_pcm_runtime *runtime = substream->runtime;
260         struct snd_soc_pcm_runtime *rtd = substream->private_data;
261         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
262         struct rt5514_dsp *rt5514_dsp =
263                 snd_soc_component_get_drvdata(component);
264
265         return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
266 }
267
268 static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
269         .open           = rt5514_spi_pcm_open,
270         .hw_params      = rt5514_spi_hw_params,
271         .hw_free        = rt5514_spi_hw_free,
272         .pointer        = rt5514_spi_pcm_pointer,
273         .mmap           = snd_pcm_lib_mmap_vmalloc,
274         .page           = snd_pcm_lib_get_vmalloc_page,
275 };
276
277 static int rt5514_spi_pcm_probe(struct snd_soc_component *component)
278 {
279         struct rt5514_dsp *rt5514_dsp;
280         int ret;
281
282         rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp),
283                         GFP_KERNEL);
284
285         rt5514_dsp->dev = &rt5514_spi->dev;
286         mutex_init(&rt5514_dsp->dma_lock);
287         INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
288         snd_soc_component_set_drvdata(component, rt5514_dsp);
289
290         if (rt5514_spi->irq) {
291                 ret = devm_request_threaded_irq(&rt5514_spi->dev,
292                         rt5514_spi->irq, NULL, rt5514_spi_irq,
293                         IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
294                         rt5514_dsp);
295                 if (ret)
296                         dev_err(&rt5514_spi->dev,
297                                 "%s Failed to reguest IRQ: %d\n", __func__,
298                                 ret);
299                 else
300                         device_init_wakeup(rt5514_dsp->dev, true);
301         }
302
303         return 0;
304 }
305
306 static const struct snd_soc_component_driver rt5514_spi_component = {
307         .name  = DRV_NAME,
308         .probe = rt5514_spi_pcm_probe,
309         .ops = &rt5514_spi_pcm_ops,
310 };
311
312 /**
313  * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
314  * @addr: Start address.
315  * @rxbuf: Data Buffer for reading.
316  * @len: Data length, it must be a multiple of 8.
317  *
318  *
319  * Returns true for success.
320  */
321 int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
322 {
323         u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
324         int status;
325         u8 write_buf[8];
326         unsigned int i, end, offset = 0;
327
328         struct spi_message message;
329         struct spi_transfer x[3];
330
331         while (offset < len) {
332                 if (offset + RT5514_SPI_BUF_LEN <= len)
333                         end = RT5514_SPI_BUF_LEN;
334                 else
335                         end = len % RT5514_SPI_BUF_LEN;
336
337                 write_buf[0] = spi_cmd;
338                 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
339                 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
340                 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
341                 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
342
343                 spi_message_init(&message);
344                 memset(x, 0, sizeof(x));
345
346                 x[0].len = 5;
347                 x[0].tx_buf = write_buf;
348                 spi_message_add_tail(&x[0], &message);
349
350                 x[1].len = 4;
351                 x[1].tx_buf = write_buf;
352                 spi_message_add_tail(&x[1], &message);
353
354                 x[2].len = end;
355                 x[2].rx_buf = rxbuf + offset;
356                 spi_message_add_tail(&x[2], &message);
357
358                 status = spi_sync(rt5514_spi, &message);
359
360                 if (status)
361                         return false;
362
363                 offset += RT5514_SPI_BUF_LEN;
364         }
365
366         for (i = 0; i < len; i += 8) {
367                 write_buf[0] = rxbuf[i + 0];
368                 write_buf[1] = rxbuf[i + 1];
369                 write_buf[2] = rxbuf[i + 2];
370                 write_buf[3] = rxbuf[i + 3];
371                 write_buf[4] = rxbuf[i + 4];
372                 write_buf[5] = rxbuf[i + 5];
373                 write_buf[6] = rxbuf[i + 6];
374                 write_buf[7] = rxbuf[i + 7];
375
376                 rxbuf[i + 0] = write_buf[7];
377                 rxbuf[i + 1] = write_buf[6];
378                 rxbuf[i + 2] = write_buf[5];
379                 rxbuf[i + 3] = write_buf[4];
380                 rxbuf[i + 4] = write_buf[3];
381                 rxbuf[i + 5] = write_buf[2];
382                 rxbuf[i + 6] = write_buf[1];
383                 rxbuf[i + 7] = write_buf[0];
384         }
385
386         return true;
387 }
388 EXPORT_SYMBOL_GPL(rt5514_spi_burst_read);
389
390 /**
391  * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
392  * @addr: Start address.
393  * @txbuf: Data Buffer for writng.
394  * @len: Data length, it must be a multiple of 8.
395  *
396  *
397  * Returns true for success.
398  */
399 int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
400 {
401         u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
402         u8 *write_buf;
403         unsigned int i, end, offset = 0;
404
405         write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
406
407         if (write_buf == NULL)
408                 return -ENOMEM;
409
410         while (offset < len) {
411                 if (offset + RT5514_SPI_BUF_LEN <= len)
412                         end = RT5514_SPI_BUF_LEN;
413                 else
414                         end = len % RT5514_SPI_BUF_LEN;
415
416                 write_buf[0] = spi_cmd;
417                 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
418                 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
419                 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
420                 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
421
422                 for (i = 0; i < end; i += 8) {
423                         write_buf[i + 12] = txbuf[offset + i + 0];
424                         write_buf[i + 11] = txbuf[offset + i + 1];
425                         write_buf[i + 10] = txbuf[offset + i + 2];
426                         write_buf[i +  9] = txbuf[offset + i + 3];
427                         write_buf[i +  8] = txbuf[offset + i + 4];
428                         write_buf[i +  7] = txbuf[offset + i + 5];
429                         write_buf[i +  6] = txbuf[offset + i + 6];
430                         write_buf[i +  5] = txbuf[offset + i + 7];
431                 }
432
433                 write_buf[end + 5] = spi_cmd;
434
435                 spi_write(rt5514_spi, write_buf, end + 6);
436
437                 offset += RT5514_SPI_BUF_LEN;
438         }
439
440         kfree(write_buf);
441
442         return 0;
443 }
444 EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
445
446 static int rt5514_spi_probe(struct spi_device *spi)
447 {
448         int ret;
449
450         rt5514_spi = spi;
451
452         ret = devm_snd_soc_register_component(&spi->dev,
453                                               &rt5514_spi_component,
454                                               &rt5514_spi_dai, 1);
455         if (ret < 0) {
456                 dev_err(&spi->dev, "Failed to register component.\n");
457                 return ret;
458         }
459
460         return 0;
461 }
462
463 static int __maybe_unused rt5514_suspend(struct device *dev)
464 {
465         int irq = to_spi_device(dev)->irq;
466
467         if (device_may_wakeup(dev))
468                 enable_irq_wake(irq);
469
470         return 0;
471 }
472
473 static int __maybe_unused rt5514_resume(struct device *dev)
474 {
475         struct snd_soc_component *component = snd_soc_lookup_component(dev, DRV_NAME);
476         struct rt5514_dsp *rt5514_dsp =
477                 snd_soc_component_get_drvdata(component);
478         int irq = to_spi_device(dev)->irq;
479         u8 buf[8];
480
481         if (device_may_wakeup(dev))
482                 disable_irq_wake(irq);
483
484         if (rt5514_dsp) {
485                 if (rt5514_dsp->substream) {
486                         rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf,
487                                 sizeof(buf));
488                         if (buf[0] & RT5514_IRQ_STATUS_BIT)
489                                 rt5514_schedule_copy(rt5514_dsp);
490                 }
491         }
492
493         return 0;
494 }
495
496 static const struct dev_pm_ops rt5514_pm_ops = {
497         SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
498 };
499
500 static const struct of_device_id rt5514_of_match[] = {
501         { .compatible = "realtek,rt5514", },
502         {},
503 };
504 MODULE_DEVICE_TABLE(of, rt5514_of_match);
505
506 static struct spi_driver rt5514_spi_driver = {
507         .driver = {
508                 .name = "rt5514",
509                 .pm = &rt5514_pm_ops,
510                 .of_match_table = of_match_ptr(rt5514_of_match),
511         },
512         .probe = rt5514_spi_probe,
513 };
514 module_spi_driver(rt5514_spi_driver);
515
516 MODULE_DESCRIPTION("RT5514 SPI driver");
517 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
518 MODULE_LICENSE("GPL v2");