1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * IMG I2S output controller driver
4 *
5 * Copyright (C) 2015 Imagination Technologies Ltd.
6 *
7 * Author: Damien Horsley <Damien.Horsley@imgtec.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/pm_runtime.h>
17#include <linux/reset.h>
18
19#include <sound/core.h>
20#include <sound/dmaengine_pcm.h>
21#include <sound/initval.h>
22#include <sound/pcm.h>
23#include <sound/pcm_params.h>
24#include <sound/soc.h>
25
26#define IMG_I2S_OUT_TX_FIFO 0x0
27
28#define IMG_I2S_OUT_CTL 0x4
29#define IMG_I2S_OUT_CTL_DATA_EN_MASK BIT(24)
30#define IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK 0xffe000
31#define IMG_I2S_OUT_CTL_ACTIVE_CHAN_SHIFT 13
32#define IMG_I2S_OUT_CTL_FRM_SIZE_MASK BIT(8)
33#define IMG_I2S_OUT_CTL_MASTER_MASK BIT(6)
34#define IMG_I2S_OUT_CTL_CLK_MASK BIT(5)
35#define IMG_I2S_OUT_CTL_CLK_EN_MASK BIT(4)
36#define IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK BIT(3)
37#define IMG_I2S_OUT_CTL_BCLK_POL_MASK BIT(2)
38#define IMG_I2S_OUT_CTL_ME_MASK BIT(0)
39
40#define IMG_I2S_OUT_CH_CTL 0x4
41#define IMG_I2S_OUT_CHAN_CTL_CH_MASK BIT(11)
42#define IMG_I2S_OUT_CHAN_CTL_LT_MASK BIT(10)
43#define IMG_I2S_OUT_CHAN_CTL_FMT_MASK 0xf0
44#define IMG_I2S_OUT_CHAN_CTL_FMT_SHIFT 4
45#define IMG_I2S_OUT_CHAN_CTL_JUST_MASK BIT(3)
46#define IMG_I2S_OUT_CHAN_CTL_CLKT_MASK BIT(1)
47#define IMG_I2S_OUT_CHAN_CTL_ME_MASK BIT(0)
48
49#define IMG_I2S_OUT_CH_STRIDE 0x20
50
51struct img_i2s_out {
52 void __iomem *base;
53 struct clk *clk_sys;
54 struct clk *clk_ref;
55 struct snd_dmaengine_dai_dma_data dma_data;
56 struct device *dev;
57 unsigned int max_i2s_chan;
58 void __iomem *channel_base;
59 bool force_clk_active;
60 unsigned int active_channels;
61 struct reset_control *rst;
62 struct snd_soc_dai_driver dai_driver;
63 u32 suspend_ctl;
64 u32 *suspend_ch_ctl;
65};
66
67static int img_i2s_out_runtime_suspend(struct device *dev)
68{
69 struct img_i2s_out *i2s = dev_get_drvdata(dev);
70
71 clk_disable_unprepare(clk: i2s->clk_ref);
72 clk_disable_unprepare(clk: i2s->clk_sys);
73
74 return 0;
75}
76
77static int img_i2s_out_runtime_resume(struct device *dev)
78{
79 struct img_i2s_out *i2s = dev_get_drvdata(dev);
80 int ret;
81
82 ret = clk_prepare_enable(clk: i2s->clk_sys);
83 if (ret) {
84 dev_err(dev, "clk_enable failed: %d\n", ret);
85 return ret;
86 }
87
88 ret = clk_prepare_enable(clk: i2s->clk_ref);
89 if (ret) {
90 dev_err(dev, "clk_enable failed: %d\n", ret);
91 clk_disable_unprepare(clk: i2s->clk_sys);
92 return ret;
93 }
94
95 return 0;
96}
97
98static inline void img_i2s_out_writel(struct img_i2s_out *i2s, u32 val,
99 u32 reg)
100{
101 writel(val, addr: i2s->base + reg);
102}
103
104static inline u32 img_i2s_out_readl(struct img_i2s_out *i2s, u32 reg)
105{
106 return readl(addr: i2s->base + reg);
107}
108
109static inline void img_i2s_out_ch_writel(struct img_i2s_out *i2s,
110 u32 chan, u32 val, u32 reg)
111{
112 writel(val, addr: i2s->channel_base + (chan * IMG_I2S_OUT_CH_STRIDE) + reg);
113}
114
115static inline u32 img_i2s_out_ch_readl(struct img_i2s_out *i2s, u32 chan,
116 u32 reg)
117{
118 return readl(addr: i2s->channel_base + (chan * IMG_I2S_OUT_CH_STRIDE) + reg);
119}
120
121static inline void img_i2s_out_ch_disable(struct img_i2s_out *i2s, u32 chan)
122{
123 u32 reg;
124
125 reg = img_i2s_out_ch_readl(i2s, chan, IMG_I2S_OUT_CH_CTL);
126 reg &= ~IMG_I2S_OUT_CHAN_CTL_ME_MASK;
127 img_i2s_out_ch_writel(i2s, chan, val: reg, IMG_I2S_OUT_CH_CTL);
128}
129
130static inline void img_i2s_out_ch_enable(struct img_i2s_out *i2s, u32 chan)
131{
132 u32 reg;
133
134 reg = img_i2s_out_ch_readl(i2s, chan, IMG_I2S_OUT_CH_CTL);
135 reg |= IMG_I2S_OUT_CHAN_CTL_ME_MASK;
136 img_i2s_out_ch_writel(i2s, chan, val: reg, IMG_I2S_OUT_CH_CTL);
137}
138
139static inline void img_i2s_out_disable(struct img_i2s_out *i2s)
140{
141 u32 reg;
142
143 reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
144 reg &= ~IMG_I2S_OUT_CTL_ME_MASK;
145 img_i2s_out_writel(i2s, val: reg, IMG_I2S_OUT_CTL);
146}
147
148static inline void img_i2s_out_enable(struct img_i2s_out *i2s)
149{
150 u32 reg;
151
152 reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
153 reg |= IMG_I2S_OUT_CTL_ME_MASK;
154 img_i2s_out_writel(i2s, val: reg, IMG_I2S_OUT_CTL);
155}
156
157static void img_i2s_out_reset(struct img_i2s_out *i2s)
158{
159 int i;
160 u32 core_ctl, chan_ctl;
161
162 core_ctl = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL) &
163 ~IMG_I2S_OUT_CTL_ME_MASK &
164 ~IMG_I2S_OUT_CTL_DATA_EN_MASK;
165
166 if (!i2s->force_clk_active)
167 core_ctl &= ~IMG_I2S_OUT_CTL_CLK_EN_MASK;
168
169 chan_ctl = img_i2s_out_ch_readl(i2s, chan: 0, IMG_I2S_OUT_CH_CTL) &
170 ~IMG_I2S_OUT_CHAN_CTL_ME_MASK;
171
172 reset_control_assert(rstc: i2s->rst);
173 reset_control_deassert(rstc: i2s->rst);
174
175 for (i = 0; i < i2s->max_i2s_chan; i++)
176 img_i2s_out_ch_writel(i2s, chan: i, val: chan_ctl, IMG_I2S_OUT_CH_CTL);
177
178 for (i = 0; i < i2s->active_channels; i++)
179 img_i2s_out_ch_enable(i2s, chan: i);
180
181 img_i2s_out_writel(i2s, val: core_ctl, IMG_I2S_OUT_CTL);
182 img_i2s_out_enable(i2s);
183}
184
185static int img_i2s_out_trigger(struct snd_pcm_substream *substream, int cmd,
186 struct snd_soc_dai *dai)
187{
188 struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);
189 u32 reg;
190
191 switch (cmd) {
192 case SNDRV_PCM_TRIGGER_START:
193 case SNDRV_PCM_TRIGGER_RESUME:
194 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
195 reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
196 if (!i2s->force_clk_active)
197 reg |= IMG_I2S_OUT_CTL_CLK_EN_MASK;
198 reg |= IMG_I2S_OUT_CTL_DATA_EN_MASK;
199 img_i2s_out_writel(i2s, val: reg, IMG_I2S_OUT_CTL);
200 break;
201 case SNDRV_PCM_TRIGGER_STOP:
202 case SNDRV_PCM_TRIGGER_SUSPEND:
203 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
204 img_i2s_out_reset(i2s);
205 break;
206 default:
207 return -EINVAL;
208 }
209
210 return 0;
211}
212
213static int img_i2s_out_hw_params(struct snd_pcm_substream *substream,
214 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
215{
216 struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);
217 unsigned int channels, i2s_channels;
218 long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate;
219 int i;
220 u32 reg, control_mask, control_set = 0;
221 snd_pcm_format_t format;
222
223 rate = params_rate(p: params);
224 format = params_format(p: params);
225 channels = params_channels(p: params);
226 i2s_channels = channels / 2;
227
228 if (format != SNDRV_PCM_FORMAT_S32_LE)
229 return -EINVAL;
230
231 if ((channels < 2) ||
232 (channels > (i2s->max_i2s_chan * 2)) ||
233 (channels % 2))
234 return -EINVAL;
235
236 pre_div_a = clk_round_rate(clk: i2s->clk_ref, rate: rate * 256);
237 if (pre_div_a < 0)
238 return pre_div_a;
239 pre_div_b = clk_round_rate(clk: i2s->clk_ref, rate: rate * 384);
240 if (pre_div_b < 0)
241 return pre_div_b;
242
243 diff_a = abs((pre_div_a / 256) - rate);
244 diff_b = abs((pre_div_b / 384) - rate);
245
246 /* If diffs are equal, use lower clock rate */
247 if (diff_a > diff_b)
248 clk_set_rate(clk: i2s->clk_ref, rate: pre_div_b);
249 else
250 clk_set_rate(clk: i2s->clk_ref, rate: pre_div_a);
251
252 /*
253 * Another driver (eg alsa machine driver) may have rejected the above
254 * change. Get the current rate and set the register bit according to
255 * the new minimum diff
256 */
257 clk_rate = clk_get_rate(clk: i2s->clk_ref);
258
259 diff_a = abs((clk_rate / 256) - rate);
260 diff_b = abs((clk_rate / 384) - rate);
261
262 if (diff_a > diff_b)
263 control_set |= IMG_I2S_OUT_CTL_CLK_MASK;
264
265 control_set |= ((i2s_channels - 1) <<
266 IMG_I2S_OUT_CTL_ACTIVE_CHAN_SHIFT) &
267 IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK;
268
269 control_mask = IMG_I2S_OUT_CTL_CLK_MASK |
270 IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK;
271
272 img_i2s_out_disable(i2s);
273
274 reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
275 reg = (reg & ~control_mask) | control_set;
276 img_i2s_out_writel(i2s, val: reg, IMG_I2S_OUT_CTL);
277
278 for (i = 0; i < i2s_channels; i++)
279 img_i2s_out_ch_enable(i2s, chan: i);
280
281 for (; i < i2s->max_i2s_chan; i++)
282 img_i2s_out_ch_disable(i2s, chan: i);
283
284 img_i2s_out_enable(i2s);
285
286 i2s->active_channels = i2s_channels;
287
288 return 0;
289}
290
291static int img_i2s_out_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
292{
293 struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);
294 int i, ret;
295 bool force_clk_active;
296 u32 chan_control_mask, control_mask, chan_control_set = 0;
297 u32 reg, control_set = 0;
298
299 force_clk_active = ((fmt & SND_SOC_DAIFMT_CLOCK_MASK) ==
300 SND_SOC_DAIFMT_CONT);
301
302 if (force_clk_active)
303 control_set |= IMG_I2S_OUT_CTL_CLK_EN_MASK;
304
305 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
306 case SND_SOC_DAIFMT_BC_FC:
307 break;
308 case SND_SOC_DAIFMT_BP_FP:
309 control_set |= IMG_I2S_OUT_CTL_MASTER_MASK;
310 break;
311 default:
312 return -EINVAL;
313 }
314
315 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
316 case SND_SOC_DAIFMT_NB_NF:
317 control_set |= IMG_I2S_OUT_CTL_BCLK_POL_MASK;
318 break;
319 case SND_SOC_DAIFMT_NB_IF:
320 control_set |= IMG_I2S_OUT_CTL_BCLK_POL_MASK;
321 control_set |= IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK;
322 break;
323 case SND_SOC_DAIFMT_IB_NF:
324 break;
325 case SND_SOC_DAIFMT_IB_IF:
326 control_set |= IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK;
327 break;
328 default:
329 return -EINVAL;
330 }
331
332 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
333 case SND_SOC_DAIFMT_I2S:
334 chan_control_set |= IMG_I2S_OUT_CHAN_CTL_CLKT_MASK;
335 break;
336 case SND_SOC_DAIFMT_LEFT_J:
337 break;
338 default:
339 return -EINVAL;
340 }
341
342 control_mask = IMG_I2S_OUT_CTL_CLK_EN_MASK |
343 IMG_I2S_OUT_CTL_MASTER_MASK |
344 IMG_I2S_OUT_CTL_BCLK_POL_MASK |
345 IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK;
346
347 chan_control_mask = IMG_I2S_OUT_CHAN_CTL_CLKT_MASK;
348
349 ret = pm_runtime_resume_and_get(dev: i2s->dev);
350 if (ret < 0)
351 return ret;
352
353 img_i2s_out_disable(i2s);
354
355 reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
356 reg = (reg & ~control_mask) | control_set;
357 img_i2s_out_writel(i2s, val: reg, IMG_I2S_OUT_CTL);
358
359 for (i = 0; i < i2s->active_channels; i++)
360 img_i2s_out_ch_disable(i2s, chan: i);
361
362 for (i = 0; i < i2s->max_i2s_chan; i++) {
363 reg = img_i2s_out_ch_readl(i2s, chan: i, IMG_I2S_OUT_CH_CTL);
364 reg = (reg & ~chan_control_mask) | chan_control_set;
365 img_i2s_out_ch_writel(i2s, chan: i, val: reg, IMG_I2S_OUT_CH_CTL);
366 }
367
368 for (i = 0; i < i2s->active_channels; i++)
369 img_i2s_out_ch_enable(i2s, chan: i);
370
371 img_i2s_out_enable(i2s);
372 pm_runtime_put(dev: i2s->dev);
373
374 i2s->force_clk_active = force_clk_active;
375
376 return 0;
377}
378
379static int img_i2s_out_dai_probe(struct snd_soc_dai *dai)
380{
381 struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);
382
383 snd_soc_dai_init_dma_data(dai, playback: &i2s->dma_data, NULL);
384
385 return 0;
386}
387
388static const struct snd_soc_dai_ops img_i2s_out_dai_ops = {
389 .probe = img_i2s_out_dai_probe,
390 .trigger = img_i2s_out_trigger,
391 .hw_params = img_i2s_out_hw_params,
392 .set_fmt = img_i2s_out_set_fmt
393};
394
395static const struct snd_soc_component_driver img_i2s_out_component = {
396 .name = "img-i2s-out",
397 .legacy_dai_naming = 1,
398};
399
400static int img_i2s_out_dma_prepare_slave_config(struct snd_pcm_substream *st,
401 struct snd_pcm_hw_params *params, struct dma_slave_config *sc)
402{
403 unsigned int i2s_channels = params_channels(p: params) / 2;
404 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream: st);
405 struct snd_dmaengine_dai_dma_data *dma_data;
406 int ret;
407
408 dma_data = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), st);
409
410 ret = snd_hwparams_to_dma_slave_config(substream: st, params, slave_config: sc);
411 if (ret)
412 return ret;
413
414 sc->dst_addr = dma_data->addr;
415 sc->dst_addr_width = dma_data->addr_width;
416 sc->dst_maxburst = 4 * i2s_channels;
417
418 return 0;
419}
420
421static const struct snd_dmaengine_pcm_config img_i2s_out_dma_config = {
422 .prepare_slave_config = img_i2s_out_dma_prepare_slave_config
423};
424
425static int img_i2s_out_probe(struct platform_device *pdev)
426{
427 struct img_i2s_out *i2s;
428 struct resource *res;
429 void __iomem *base;
430 int i, ret;
431 unsigned int max_i2s_chan_pow_2;
432 u32 reg;
433 struct device *dev = &pdev->dev;
434
435 i2s = devm_kzalloc(dev: &pdev->dev, size: sizeof(*i2s), GFP_KERNEL);
436 if (!i2s)
437 return -ENOMEM;
438
439 platform_set_drvdata(pdev, data: i2s);
440
441 i2s->dev = &pdev->dev;
442
443 base = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res);
444 if (IS_ERR(ptr: base))
445 return PTR_ERR(ptr: base);
446
447 i2s->base = base;
448
449 if (of_property_read_u32(np: pdev->dev.of_node, propname: "img,i2s-channels",
450 out_value: &i2s->max_i2s_chan)) {
451 dev_err(&pdev->dev, "No img,i2s-channels property\n");
452 return -EINVAL;
453 }
454
455 max_i2s_chan_pow_2 = 1 << get_count_order(count: i2s->max_i2s_chan);
456
457 i2s->channel_base = base + (max_i2s_chan_pow_2 * 0x20);
458
459 i2s->rst = devm_reset_control_get_exclusive(dev: &pdev->dev, id: "rst");
460 if (IS_ERR(ptr: i2s->rst))
461 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: i2s->rst),
462 fmt: "No top level reset found\n");
463
464 i2s->clk_sys = devm_clk_get(dev: &pdev->dev, id: "sys");
465 if (IS_ERR(ptr: i2s->clk_sys))
466 return dev_err_probe(dev, err: PTR_ERR(ptr: i2s->clk_sys),
467 fmt: "Failed to acquire clock 'sys'\n");
468
469 i2s->clk_ref = devm_clk_get(dev: &pdev->dev, id: "ref");
470 if (IS_ERR(ptr: i2s->clk_ref))
471 return dev_err_probe(dev, err: PTR_ERR(ptr: i2s->clk_ref),
472 fmt: "Failed to acquire clock 'ref'\n");
473
474 i2s->suspend_ch_ctl = devm_kcalloc(dev,
475 n: i2s->max_i2s_chan, size: sizeof(*i2s->suspend_ch_ctl), GFP_KERNEL);
476 if (!i2s->suspend_ch_ctl)
477 return -ENOMEM;
478
479 pm_runtime_enable(dev: &pdev->dev);
480 if (!pm_runtime_enabled(dev: &pdev->dev)) {
481 ret = img_i2s_out_runtime_resume(dev: &pdev->dev);
482 if (ret)
483 goto err_pm_disable;
484 }
485 ret = pm_runtime_resume_and_get(dev: &pdev->dev);
486 if (ret < 0)
487 goto err_suspend;
488
489 reg = IMG_I2S_OUT_CTL_FRM_SIZE_MASK;
490 img_i2s_out_writel(i2s, val: reg, IMG_I2S_OUT_CTL);
491
492 reg = IMG_I2S_OUT_CHAN_CTL_JUST_MASK |
493 IMG_I2S_OUT_CHAN_CTL_LT_MASK |
494 IMG_I2S_OUT_CHAN_CTL_CH_MASK |
495 (8 << IMG_I2S_OUT_CHAN_CTL_FMT_SHIFT);
496
497 for (i = 0; i < i2s->max_i2s_chan; i++)
498 img_i2s_out_ch_writel(i2s, chan: i, val: reg, IMG_I2S_OUT_CH_CTL);
499
500 img_i2s_out_reset(i2s);
501 pm_runtime_put(dev: &pdev->dev);
502
503 i2s->active_channels = 1;
504 i2s->dma_data.addr = res->start + IMG_I2S_OUT_TX_FIFO;
505 i2s->dma_data.addr_width = 4;
506 i2s->dma_data.maxburst = 4;
507
508 i2s->dai_driver.playback.channels_min = 2;
509 i2s->dai_driver.playback.channels_max = i2s->max_i2s_chan * 2;
510 i2s->dai_driver.playback.rates = SNDRV_PCM_RATE_8000_192000;
511 i2s->dai_driver.playback.formats = SNDRV_PCM_FMTBIT_S32_LE;
512 i2s->dai_driver.ops = &img_i2s_out_dai_ops;
513
514 ret = devm_snd_soc_register_component(dev: &pdev->dev,
515 component_driver: &img_i2s_out_component, dai_drv: &i2s->dai_driver, num_dai: 1);
516 if (ret)
517 goto err_suspend;
518
519 ret = devm_snd_dmaengine_pcm_register(dev: &pdev->dev,
520 config: &img_i2s_out_dma_config, flags: 0);
521 if (ret)
522 goto err_suspend;
523
524 return 0;
525
526err_suspend:
527 if (!pm_runtime_status_suspended(dev: &pdev->dev))
528 img_i2s_out_runtime_suspend(dev: &pdev->dev);
529err_pm_disable:
530 pm_runtime_disable(dev: &pdev->dev);
531
532 return ret;
533}
534
535static void img_i2s_out_dev_remove(struct platform_device *pdev)
536{
537 pm_runtime_disable(dev: &pdev->dev);
538 if (!pm_runtime_status_suspended(dev: &pdev->dev))
539 img_i2s_out_runtime_suspend(dev: &pdev->dev);
540}
541
542static int img_i2s_out_suspend(struct device *dev)
543{
544 struct img_i2s_out *i2s = dev_get_drvdata(dev);
545 int i, ret;
546 u32 reg;
547
548 if (pm_runtime_status_suspended(dev)) {
549 ret = img_i2s_out_runtime_resume(dev);
550 if (ret)
551 return ret;
552 }
553
554 for (i = 0; i < i2s->max_i2s_chan; i++) {
555 reg = img_i2s_out_ch_readl(i2s, chan: i, IMG_I2S_OUT_CH_CTL);
556 i2s->suspend_ch_ctl[i] = reg;
557 }
558
559 i2s->suspend_ctl = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
560
561 img_i2s_out_runtime_suspend(dev);
562
563 return 0;
564}
565
566static int img_i2s_out_resume(struct device *dev)
567{
568 struct img_i2s_out *i2s = dev_get_drvdata(dev);
569 int i, ret;
570 u32 reg;
571
572 ret = img_i2s_out_runtime_resume(dev);
573 if (ret)
574 return ret;
575
576 for (i = 0; i < i2s->max_i2s_chan; i++) {
577 reg = i2s->suspend_ch_ctl[i];
578 img_i2s_out_ch_writel(i2s, chan: i, val: reg, IMG_I2S_OUT_CH_CTL);
579 }
580
581 img_i2s_out_writel(i2s, val: i2s->suspend_ctl, IMG_I2S_OUT_CTL);
582
583 if (pm_runtime_status_suspended(dev))
584 img_i2s_out_runtime_suspend(dev);
585
586 return 0;
587}
588
589static const struct of_device_id img_i2s_out_of_match[] = {
590 { .compatible = "img,i2s-out" },
591 {}
592};
593MODULE_DEVICE_TABLE(of, img_i2s_out_of_match);
594
595static const struct dev_pm_ops img_i2s_out_pm_ops = {
596 RUNTIME_PM_OPS(img_i2s_out_runtime_suspend, img_i2s_out_runtime_resume, NULL)
597 SYSTEM_SLEEP_PM_OPS(img_i2s_out_suspend, img_i2s_out_resume)
598};
599
600static struct platform_driver img_i2s_out_driver = {
601 .driver = {
602 .name = "img-i2s-out",
603 .of_match_table = img_i2s_out_of_match,
604 .pm = pm_ptr(&img_i2s_out_pm_ops)
605 },
606 .probe = img_i2s_out_probe,
607 .remove = img_i2s_out_dev_remove
608};
609module_platform_driver(img_i2s_out_driver);
610
611MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
612MODULE_DESCRIPTION("IMG I2S Output Driver");
613MODULE_LICENSE("GPL v2");
614

source code of linux/sound/soc/img/img-i2s-out.c