1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * rt5677-spi.c -- RT5677 ALSA SoC audio codec driver |
4 | * |
5 | * Copyright 2013 Realtek Semiconductor Corp. |
6 | * Author: Oder Chiou <oder_chiou@realtek.com> |
7 | */ |
8 | |
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/sched.h> |
19 | #include <linux/uaccess.h> |
20 | #include <linux/regulator/consumer.h> |
21 | #include <linux/pm_qos.h> |
22 | #include <linux/sysfs.h> |
23 | #include <linux/clk.h> |
24 | #include <linux/firmware.h> |
25 | #include <linux/acpi.h> |
26 | |
27 | #include <sound/soc.h> |
28 | |
29 | #include "rt5677.h" |
30 | #include "rt5677-spi.h" |
31 | |
32 | #define DRV_NAME "rt5677spi" |
33 | |
34 | #define RT5677_SPI_BURST_LEN 240 |
35 | #define 5 |
36 | #define RT5677_SPI_FREQ 6000000 |
37 | |
38 | /* The AddressPhase and DataPhase of SPI commands are MSB first on the wire. |
39 | * DataPhase word size of 16-bit commands is 2 bytes. |
40 | * DataPhase word size of 32-bit commands is 4 bytes. |
41 | * DataPhase word size of burst commands is 8 bytes. |
42 | * The DSP CPU is little-endian. |
43 | */ |
44 | #define RT5677_SPI_WRITE_BURST 0x5 |
45 | #define RT5677_SPI_READ_BURST 0x4 |
46 | #define RT5677_SPI_WRITE_32 0x3 |
47 | #define RT5677_SPI_READ_32 0x2 |
48 | #define RT5677_SPI_WRITE_16 0x1 |
49 | #define RT5677_SPI_READ_16 0x0 |
50 | |
51 | #define RT5677_BUF_BYTES_TOTAL 0x20000 |
52 | #define RT5677_MIC_BUF_ADDR 0x60030000 |
53 | #define RT5677_MODEL_ADDR 0x5FFC9800 |
54 | #define RT5677_MIC_BUF_BYTES ((u32)(RT5677_BUF_BYTES_TOTAL - \ |
55 | sizeof(u32))) |
56 | #define RT5677_MIC_BUF_FIRST_READ_SIZE 0x10000 |
57 | |
58 | static struct spi_device *g_spi; |
59 | static DEFINE_MUTEX(spi_mutex); |
60 | |
61 | struct rt5677_dsp { |
62 | struct device *dev; |
63 | struct delayed_work copy_work; |
64 | struct mutex dma_lock; |
65 | struct snd_pcm_substream *substream; |
66 | size_t dma_offset; /* zero-based offset into runtime->dma_area */ |
67 | size_t avail_bytes; /* number of new bytes since last period */ |
68 | u32 mic_read_offset; /* zero-based offset into DSP's mic buffer */ |
69 | bool new_hotword; /* a new hotword is fired */ |
70 | }; |
71 | |
72 | static const struct snd_pcm_hardware rt5677_spi_pcm_hardware = { |
73 | .info = SNDRV_PCM_INFO_MMAP | |
74 | SNDRV_PCM_INFO_MMAP_VALID | |
75 | SNDRV_PCM_INFO_INTERLEAVED, |
76 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
77 | .period_bytes_min = PAGE_SIZE, |
78 | .period_bytes_max = RT5677_BUF_BYTES_TOTAL / 8, |
79 | .periods_min = 8, |
80 | .periods_max = 8, |
81 | .channels_min = 1, |
82 | .channels_max = 1, |
83 | .buffer_bytes_max = RT5677_BUF_BYTES_TOTAL, |
84 | }; |
85 | |
86 | static struct snd_soc_dai_driver rt5677_spi_dai = { |
87 | /* The DAI name "rt5677-dsp-cpu-dai" is not used. The actual DAI name |
88 | * registered with ASoC is the name of the device "spi-RT5677AA:00", |
89 | * because we only have one DAI. See snd_soc_register_dais(). |
90 | */ |
91 | .name = "rt5677-dsp-cpu-dai" , |
92 | .id = 0, |
93 | .capture = { |
94 | .stream_name = "DSP Capture" , |
95 | .channels_min = 1, |
96 | .channels_max = 1, |
97 | .rates = SNDRV_PCM_RATE_16000, |
98 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
99 | }, |
100 | }; |
101 | |
102 | /* PCM for streaming audio from the DSP buffer */ |
103 | static int rt5677_spi_pcm_open( |
104 | struct snd_soc_component *component, |
105 | struct snd_pcm_substream *substream) |
106 | { |
107 | snd_soc_set_runtime_hwparams(substream, hw: &rt5677_spi_pcm_hardware); |
108 | return 0; |
109 | } |
110 | |
111 | static int rt5677_spi_pcm_close( |
112 | struct snd_soc_component *component, |
113 | struct snd_pcm_substream *substream) |
114 | { |
115 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
116 | struct snd_soc_component *codec_component = |
117 | snd_soc_rtdcom_lookup(rtd, driver_name: "rt5677" ); |
118 | struct rt5677_priv *rt5677 = |
119 | snd_soc_component_get_drvdata(c: codec_component); |
120 | struct rt5677_dsp *rt5677_dsp = |
121 | snd_soc_component_get_drvdata(c: component); |
122 | |
123 | cancel_delayed_work_sync(dwork: &rt5677_dsp->copy_work); |
124 | rt5677->set_dsp_vad(codec_component, false); |
125 | return 0; |
126 | } |
127 | |
128 | static int rt5677_spi_hw_params( |
129 | struct snd_soc_component *component, |
130 | struct snd_pcm_substream *substream, |
131 | struct snd_pcm_hw_params *hw_params) |
132 | { |
133 | struct rt5677_dsp *rt5677_dsp = |
134 | snd_soc_component_get_drvdata(c: component); |
135 | |
136 | mutex_lock(&rt5677_dsp->dma_lock); |
137 | rt5677_dsp->substream = substream; |
138 | mutex_unlock(lock: &rt5677_dsp->dma_lock); |
139 | |
140 | return 0; |
141 | } |
142 | |
143 | static int rt5677_spi_hw_free( |
144 | struct snd_soc_component *component, |
145 | struct snd_pcm_substream *substream) |
146 | { |
147 | struct rt5677_dsp *rt5677_dsp = |
148 | snd_soc_component_get_drvdata(c: component); |
149 | |
150 | mutex_lock(&rt5677_dsp->dma_lock); |
151 | rt5677_dsp->substream = NULL; |
152 | mutex_unlock(lock: &rt5677_dsp->dma_lock); |
153 | |
154 | return 0; |
155 | } |
156 | |
157 | static int rt5677_spi_prepare( |
158 | struct snd_soc_component *component, |
159 | struct snd_pcm_substream *substream) |
160 | { |
161 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
162 | struct snd_soc_component *rt5677_component = |
163 | snd_soc_rtdcom_lookup(rtd, driver_name: "rt5677" ); |
164 | struct rt5677_priv *rt5677 = |
165 | snd_soc_component_get_drvdata(c: rt5677_component); |
166 | struct rt5677_dsp *rt5677_dsp = |
167 | snd_soc_component_get_drvdata(c: component); |
168 | |
169 | rt5677->set_dsp_vad(rt5677_component, true); |
170 | rt5677_dsp->dma_offset = 0; |
171 | rt5677_dsp->avail_bytes = 0; |
172 | return 0; |
173 | } |
174 | |
175 | static snd_pcm_uframes_t rt5677_spi_pcm_pointer( |
176 | struct snd_soc_component *component, |
177 | struct snd_pcm_substream *substream) |
178 | { |
179 | struct snd_pcm_runtime *runtime = substream->runtime; |
180 | struct rt5677_dsp *rt5677_dsp = |
181 | snd_soc_component_get_drvdata(c: component); |
182 | |
183 | return bytes_to_frames(runtime, size: rt5677_dsp->dma_offset); |
184 | } |
185 | |
186 | static int rt5677_spi_mic_write_offset(u32 *mic_write_offset) |
187 | { |
188 | int ret; |
189 | /* Grab the first 4 bytes that hold the write pointer on the |
190 | * dsp, and check to make sure that it points somewhere inside the |
191 | * buffer. |
192 | */ |
193 | ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR, rxbuf: mic_write_offset, |
194 | len: sizeof(u32)); |
195 | if (ret) |
196 | return ret; |
197 | /* Adjust the offset so that it's zero-based */ |
198 | *mic_write_offset = *mic_write_offset - sizeof(u32); |
199 | return *mic_write_offset < RT5677_MIC_BUF_BYTES ? 0 : -EFAULT; |
200 | } |
201 | |
202 | /* |
203 | * Copy one contiguous block of audio samples from the DSP mic buffer to the |
204 | * dma_area of the pcm runtime. The receiving buffer may wrap around. |
205 | * @begin: start offset of the block to copy, in bytes. |
206 | * @end: offset of the first byte after the block to copy, must be greater |
207 | * than or equal to begin. |
208 | * |
209 | * Return: Zero if successful, or a negative error code on failure. |
210 | */ |
211 | static int rt5677_spi_copy_block(struct rt5677_dsp *rt5677_dsp, |
212 | u32 begin, u32 end) |
213 | { |
214 | struct snd_pcm_runtime *runtime = rt5677_dsp->substream->runtime; |
215 | size_t bytes_per_frame = frames_to_bytes(runtime, size: 1); |
216 | size_t first_chunk_len, second_chunk_len; |
217 | int ret; |
218 | |
219 | if (begin > end || runtime->dma_bytes < 2 * bytes_per_frame) { |
220 | dev_err(rt5677_dsp->dev, |
221 | "Invalid copy from (%u, %u), dma_area size %zu\n" , |
222 | begin, end, runtime->dma_bytes); |
223 | return -EINVAL; |
224 | } |
225 | |
226 | /* The block to copy is empty */ |
227 | if (begin == end) |
228 | return 0; |
229 | |
230 | /* If the incoming chunk is too big for the receiving buffer, only the |
231 | * last "receiving buffer size - one frame" bytes are copied. |
232 | */ |
233 | if (end - begin > runtime->dma_bytes - bytes_per_frame) |
234 | begin = end - (runtime->dma_bytes - bytes_per_frame); |
235 | |
236 | /* May need to split to two chunks, calculate the size of each */ |
237 | first_chunk_len = end - begin; |
238 | second_chunk_len = 0; |
239 | if (rt5677_dsp->dma_offset + first_chunk_len > runtime->dma_bytes) { |
240 | /* Receiving buffer wrapped around */ |
241 | second_chunk_len = first_chunk_len; |
242 | first_chunk_len = runtime->dma_bytes - rt5677_dsp->dma_offset; |
243 | second_chunk_len -= first_chunk_len; |
244 | } |
245 | |
246 | /* Copy first chunk */ |
247 | ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR + sizeof(u32) + begin, |
248 | rxbuf: runtime->dma_area + rt5677_dsp->dma_offset, |
249 | len: first_chunk_len); |
250 | if (ret) |
251 | return ret; |
252 | rt5677_dsp->dma_offset += first_chunk_len; |
253 | if (rt5677_dsp->dma_offset == runtime->dma_bytes) |
254 | rt5677_dsp->dma_offset = 0; |
255 | |
256 | /* Copy second chunk */ |
257 | if (second_chunk_len) { |
258 | ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR + sizeof(u32) + |
259 | begin + first_chunk_len, rxbuf: runtime->dma_area, |
260 | len: second_chunk_len); |
261 | if (!ret) |
262 | rt5677_dsp->dma_offset = second_chunk_len; |
263 | } |
264 | return ret; |
265 | } |
266 | |
267 | /* |
268 | * Copy a given amount of audio samples from the DSP mic buffer starting at |
269 | * mic_read_offset, to the dma_area of the pcm runtime. The source buffer may |
270 | * wrap around. mic_read_offset is updated after successful copy. |
271 | * @amount: amount of samples to copy, in bytes. |
272 | * |
273 | * Return: Zero if successful, or a negative error code on failure. |
274 | */ |
275 | static int rt5677_spi_copy(struct rt5677_dsp *rt5677_dsp, u32 amount) |
276 | { |
277 | int ret = 0; |
278 | u32 target; |
279 | |
280 | if (amount == 0) |
281 | return ret; |
282 | |
283 | target = rt5677_dsp->mic_read_offset + amount; |
284 | /* Copy the first chunk in DSP's mic buffer */ |
285 | ret |= rt5677_spi_copy_block(rt5677_dsp, begin: rt5677_dsp->mic_read_offset, |
286 | min(target, RT5677_MIC_BUF_BYTES)); |
287 | |
288 | if (target >= RT5677_MIC_BUF_BYTES) { |
289 | /* Wrap around, copy the second chunk */ |
290 | target -= RT5677_MIC_BUF_BYTES; |
291 | ret |= rt5677_spi_copy_block(rt5677_dsp, begin: 0, end: target); |
292 | } |
293 | |
294 | if (!ret) |
295 | rt5677_dsp->mic_read_offset = target; |
296 | return ret; |
297 | } |
298 | |
299 | /* |
300 | * A delayed work that streams audio samples from the DSP mic buffer to the |
301 | * dma_area of the pcm runtime via SPI. |
302 | */ |
303 | static void rt5677_spi_copy_work(struct work_struct *work) |
304 | { |
305 | struct rt5677_dsp *rt5677_dsp = |
306 | container_of(work, struct rt5677_dsp, copy_work.work); |
307 | struct snd_pcm_runtime *runtime; |
308 | u32 mic_write_offset; |
309 | size_t new_bytes, copy_bytes, period_bytes; |
310 | unsigned int delay; |
311 | int ret = 0; |
312 | |
313 | /* Ensure runtime->dma_area buffer does not go away while copying. */ |
314 | mutex_lock(&rt5677_dsp->dma_lock); |
315 | if (!rt5677_dsp->substream) { |
316 | dev_err(rt5677_dsp->dev, "No pcm substream\n" ); |
317 | goto done; |
318 | } |
319 | |
320 | runtime = rt5677_dsp->substream->runtime; |
321 | |
322 | if (rt5677_spi_mic_write_offset(mic_write_offset: &mic_write_offset)) { |
323 | dev_err(rt5677_dsp->dev, "No mic_write_offset\n" ); |
324 | goto done; |
325 | } |
326 | |
327 | /* If this is the first time that we've asked for streaming data after |
328 | * a hotword is fired, we should start reading from the previous 2 |
329 | * seconds of audio from wherever the mic_write_offset is currently. |
330 | */ |
331 | if (rt5677_dsp->new_hotword) { |
332 | rt5677_dsp->new_hotword = false; |
333 | /* See if buffer wraparound happens */ |
334 | if (mic_write_offset < RT5677_MIC_BUF_FIRST_READ_SIZE) |
335 | rt5677_dsp->mic_read_offset = RT5677_MIC_BUF_BYTES - |
336 | (RT5677_MIC_BUF_FIRST_READ_SIZE - |
337 | mic_write_offset); |
338 | else |
339 | rt5677_dsp->mic_read_offset = mic_write_offset - |
340 | RT5677_MIC_BUF_FIRST_READ_SIZE; |
341 | } |
342 | |
343 | /* Calculate the amount of new samples in bytes */ |
344 | if (rt5677_dsp->mic_read_offset <= mic_write_offset) |
345 | new_bytes = mic_write_offset - rt5677_dsp->mic_read_offset; |
346 | else |
347 | new_bytes = RT5677_MIC_BUF_BYTES + mic_write_offset |
348 | - rt5677_dsp->mic_read_offset; |
349 | |
350 | /* Copy all new samples from DSP mic buffer, one period at a time */ |
351 | period_bytes = snd_pcm_lib_period_bytes(substream: rt5677_dsp->substream); |
352 | while (new_bytes) { |
353 | copy_bytes = min(new_bytes, period_bytes |
354 | - rt5677_dsp->avail_bytes); |
355 | ret = rt5677_spi_copy(rt5677_dsp, amount: copy_bytes); |
356 | if (ret) { |
357 | dev_err(rt5677_dsp->dev, "Copy failed %d\n" , ret); |
358 | goto done; |
359 | } |
360 | rt5677_dsp->avail_bytes += copy_bytes; |
361 | if (rt5677_dsp->avail_bytes >= period_bytes) { |
362 | snd_pcm_period_elapsed(substream: rt5677_dsp->substream); |
363 | rt5677_dsp->avail_bytes = 0; |
364 | } |
365 | new_bytes -= copy_bytes; |
366 | } |
367 | |
368 | delay = bytes_to_frames(runtime, size: period_bytes) / (runtime->rate / 1000); |
369 | schedule_delayed_work(dwork: &rt5677_dsp->copy_work, delay: msecs_to_jiffies(m: delay)); |
370 | done: |
371 | mutex_unlock(lock: &rt5677_dsp->dma_lock); |
372 | } |
373 | |
374 | static int rt5677_spi_pcm_new(struct snd_soc_component *component, |
375 | struct snd_soc_pcm_runtime *rtd) |
376 | { |
377 | snd_pcm_set_managed_buffer_all(pcm: rtd->pcm, SNDRV_DMA_TYPE_VMALLOC, |
378 | NULL, size: 0, max: 0); |
379 | return 0; |
380 | } |
381 | |
382 | static int rt5677_spi_pcm_probe(struct snd_soc_component *component) |
383 | { |
384 | struct rt5677_dsp *rt5677_dsp; |
385 | |
386 | rt5677_dsp = devm_kzalloc(dev: component->dev, size: sizeof(*rt5677_dsp), |
387 | GFP_KERNEL); |
388 | if (!rt5677_dsp) |
389 | return -ENOMEM; |
390 | rt5677_dsp->dev = &g_spi->dev; |
391 | mutex_init(&rt5677_dsp->dma_lock); |
392 | INIT_DELAYED_WORK(&rt5677_dsp->copy_work, rt5677_spi_copy_work); |
393 | |
394 | snd_soc_component_set_drvdata(c: component, data: rt5677_dsp); |
395 | return 0; |
396 | } |
397 | |
398 | static const struct snd_soc_component_driver rt5677_spi_dai_component = { |
399 | .name = DRV_NAME, |
400 | .probe = rt5677_spi_pcm_probe, |
401 | .open = rt5677_spi_pcm_open, |
402 | .close = rt5677_spi_pcm_close, |
403 | .hw_params = rt5677_spi_hw_params, |
404 | .hw_free = rt5677_spi_hw_free, |
405 | .prepare = rt5677_spi_prepare, |
406 | .pointer = rt5677_spi_pcm_pointer, |
407 | .pcm_construct = rt5677_spi_pcm_new, |
408 | .legacy_dai_naming = 1, |
409 | }; |
410 | |
411 | /* Select a suitable transfer command for the next transfer to ensure |
412 | * the transfer address is always naturally aligned while minimizing |
413 | * the total number of transfers required. |
414 | * |
415 | * 3 transfer commands are available: |
416 | * RT5677_SPI_READ/WRITE_16: Transfer 2 bytes |
417 | * RT5677_SPI_READ/WRITE_32: Transfer 4 bytes |
418 | * RT5677_SPI_READ/WRITE_BURST: Transfer any multiples of 8 bytes |
419 | * |
420 | * Note: |
421 | * 16 Bit writes and reads are restricted to the address range |
422 | * 0x18020000 ~ 0x18021000 |
423 | * |
424 | * For example, reading 256 bytes at 0x60030004 uses the following commands: |
425 | * 0x60030004 RT5677_SPI_READ_32 4 bytes |
426 | * 0x60030008 RT5677_SPI_READ_BURST 240 bytes |
427 | * 0x600300F8 RT5677_SPI_READ_BURST 8 bytes |
428 | * 0x60030100 RT5677_SPI_READ_32 4 bytes |
429 | * |
430 | * Input: |
431 | * @read: true for read commands; false for write commands |
432 | * @align: alignment of the next transfer address |
433 | * @remain: number of bytes remaining to transfer |
434 | * |
435 | * Output: |
436 | * @len: number of bytes to transfer with the selected command |
437 | * Returns the selected command |
438 | */ |
439 | static u8 rt5677_spi_select_cmd(bool read, u32 align, u32 remain, u32 *len) |
440 | { |
441 | u8 cmd; |
442 | |
443 | if (align == 4 || remain <= 4) { |
444 | cmd = RT5677_SPI_READ_32; |
445 | *len = 4; |
446 | } else { |
447 | cmd = RT5677_SPI_READ_BURST; |
448 | *len = (((remain - 1) >> 3) + 1) << 3; |
449 | *len = min_t(u32, *len, RT5677_SPI_BURST_LEN); |
450 | } |
451 | return read ? cmd : cmd + 1; |
452 | } |
453 | |
454 | /* Copy dstlen bytes from src to dst, while reversing byte order for each word. |
455 | * If srclen < dstlen, zeros are padded. |
456 | */ |
457 | static void rt5677_spi_reverse(u8 *dst, u32 dstlen, const u8 *src, u32 srclen) |
458 | { |
459 | u32 w, i, si; |
460 | u32 word_size = min_t(u32, dstlen, 8); |
461 | |
462 | for (w = 0; w < dstlen; w += word_size) { |
463 | for (i = 0; i < word_size && i + w < dstlen; i++) { |
464 | si = w + word_size - i - 1; |
465 | dst[w + i] = si < srclen ? src[si] : 0; |
466 | } |
467 | } |
468 | } |
469 | |
470 | /* Read DSP address space using SPI. addr and len have to be 4-byte aligned. */ |
471 | int rt5677_spi_read(u32 addr, void *rxbuf, size_t len) |
472 | { |
473 | u32 offset; |
474 | int status = 0; |
475 | struct spi_transfer t[2]; |
476 | struct spi_message m; |
477 | /* +4 bytes is for the DummyPhase following the AddressPhase */ |
478 | u8 [RT5677_SPI_HEADER + 4]; |
479 | u8 body[RT5677_SPI_BURST_LEN]; |
480 | u8 spi_cmd; |
481 | u8 *cb = rxbuf; |
482 | |
483 | if (!g_spi) |
484 | return -ENODEV; |
485 | |
486 | if ((addr & 3) || (len & 3)) { |
487 | dev_err(&g_spi->dev, "Bad read align 0x%x(%zu)\n" , addr, len); |
488 | return -EACCES; |
489 | } |
490 | |
491 | memset(t, 0, sizeof(t)); |
492 | t[0].tx_buf = header; |
493 | t[0].len = sizeof(header); |
494 | t[0].speed_hz = RT5677_SPI_FREQ; |
495 | t[1].rx_buf = body; |
496 | t[1].speed_hz = RT5677_SPI_FREQ; |
497 | spi_message_init_with_transfers(m: &m, xfers: t, ARRAY_SIZE(t)); |
498 | |
499 | for (offset = 0; offset < len; offset += t[1].len) { |
500 | spi_cmd = rt5677_spi_select_cmd(read: true, align: (addr + offset) & 7, |
501 | remain: len - offset, len: &t[1].len); |
502 | |
503 | /* Construct SPI message header */ |
504 | header[0] = spi_cmd; |
505 | header[1] = ((addr + offset) & 0xff000000) >> 24; |
506 | header[2] = ((addr + offset) & 0x00ff0000) >> 16; |
507 | header[3] = ((addr + offset) & 0x0000ff00) >> 8; |
508 | header[4] = ((addr + offset) & 0x000000ff) >> 0; |
509 | |
510 | mutex_lock(&spi_mutex); |
511 | status |= spi_sync(spi: g_spi, message: &m); |
512 | mutex_unlock(lock: &spi_mutex); |
513 | |
514 | |
515 | /* Copy data back to caller buffer */ |
516 | rt5677_spi_reverse(dst: cb + offset, dstlen: len - offset, src: body, srclen: t[1].len); |
517 | } |
518 | return status; |
519 | } |
520 | EXPORT_SYMBOL_GPL(rt5677_spi_read); |
521 | |
522 | /* Write DSP address space using SPI. addr has to be 4-byte aligned. |
523 | * If len is not 4-byte aligned, then extra zeros are written at the end |
524 | * as padding. |
525 | */ |
526 | int rt5677_spi_write(u32 addr, const void *txbuf, size_t len) |
527 | { |
528 | u32 offset; |
529 | int status = 0; |
530 | struct spi_transfer t; |
531 | struct spi_message m; |
532 | /* +1 byte is for the DummyPhase following the DataPhase */ |
533 | u8 buf[RT5677_SPI_HEADER + RT5677_SPI_BURST_LEN + 1]; |
534 | u8 *body = buf + RT5677_SPI_HEADER; |
535 | u8 spi_cmd; |
536 | const u8 *cb = txbuf; |
537 | |
538 | if (!g_spi) |
539 | return -ENODEV; |
540 | |
541 | if (addr & 3) { |
542 | dev_err(&g_spi->dev, "Bad write align 0x%x(%zu)\n" , addr, len); |
543 | return -EACCES; |
544 | } |
545 | |
546 | memset(&t, 0, sizeof(t)); |
547 | t.tx_buf = buf; |
548 | t.speed_hz = RT5677_SPI_FREQ; |
549 | spi_message_init_with_transfers(m: &m, xfers: &t, num_xfers: 1); |
550 | |
551 | for (offset = 0; offset < len;) { |
552 | spi_cmd = rt5677_spi_select_cmd(read: false, align: (addr + offset) & 7, |
553 | remain: len - offset, len: &t.len); |
554 | |
555 | /* Construct SPI message header */ |
556 | buf[0] = spi_cmd; |
557 | buf[1] = ((addr + offset) & 0xff000000) >> 24; |
558 | buf[2] = ((addr + offset) & 0x00ff0000) >> 16; |
559 | buf[3] = ((addr + offset) & 0x0000ff00) >> 8; |
560 | buf[4] = ((addr + offset) & 0x000000ff) >> 0; |
561 | |
562 | /* Fetch data from caller buffer */ |
563 | rt5677_spi_reverse(dst: body, dstlen: t.len, src: cb + offset, srclen: len - offset); |
564 | offset += t.len; |
565 | t.len += RT5677_SPI_HEADER + 1; |
566 | |
567 | mutex_lock(&spi_mutex); |
568 | status |= spi_sync(spi: g_spi, message: &m); |
569 | mutex_unlock(lock: &spi_mutex); |
570 | } |
571 | return status; |
572 | } |
573 | EXPORT_SYMBOL_GPL(rt5677_spi_write); |
574 | |
575 | int rt5677_spi_write_firmware(u32 addr, const struct firmware *fw) |
576 | { |
577 | return rt5677_spi_write(addr, fw->data, fw->size); |
578 | } |
579 | EXPORT_SYMBOL_GPL(rt5677_spi_write_firmware); |
580 | |
581 | void rt5677_spi_hotword_detected(void) |
582 | { |
583 | struct rt5677_dsp *rt5677_dsp; |
584 | |
585 | if (!g_spi) |
586 | return; |
587 | |
588 | rt5677_dsp = dev_get_drvdata(dev: &g_spi->dev); |
589 | if (!rt5677_dsp) { |
590 | dev_err(&g_spi->dev, "Can't get rt5677_dsp\n" ); |
591 | return; |
592 | } |
593 | |
594 | mutex_lock(&rt5677_dsp->dma_lock); |
595 | dev_info(rt5677_dsp->dev, "Hotword detected\n" ); |
596 | rt5677_dsp->new_hotword = true; |
597 | mutex_unlock(lock: &rt5677_dsp->dma_lock); |
598 | |
599 | schedule_delayed_work(dwork: &rt5677_dsp->copy_work, delay: 0); |
600 | } |
601 | EXPORT_SYMBOL_GPL(rt5677_spi_hotword_detected); |
602 | |
603 | static int rt5677_spi_probe(struct spi_device *spi) |
604 | { |
605 | int ret; |
606 | |
607 | g_spi = spi; |
608 | |
609 | ret = devm_snd_soc_register_component(dev: &spi->dev, |
610 | component_driver: &rt5677_spi_dai_component, |
611 | dai_drv: &rt5677_spi_dai, num_dai: 1); |
612 | if (ret < 0) |
613 | dev_err(&spi->dev, "Failed to register component.\n" ); |
614 | |
615 | return ret; |
616 | } |
617 | |
618 | #ifdef CONFIG_ACPI |
619 | static const struct acpi_device_id rt5677_spi_acpi_id[] = { |
620 | { "RT5677AA" , 0 }, |
621 | { } |
622 | }; |
623 | MODULE_DEVICE_TABLE(acpi, rt5677_spi_acpi_id); |
624 | #endif |
625 | |
626 | static struct spi_driver rt5677_spi_driver = { |
627 | .driver = { |
628 | .name = DRV_NAME, |
629 | .acpi_match_table = ACPI_PTR(rt5677_spi_acpi_id), |
630 | }, |
631 | .probe = rt5677_spi_probe, |
632 | }; |
633 | module_spi_driver(rt5677_spi_driver); |
634 | |
635 | MODULE_DESCRIPTION("ASoC RT5677 SPI driver" ); |
636 | MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>" ); |
637 | MODULE_LICENSE("GPL v2" ); |
638 | |