ALSA: arm: Constify snd_ac97_bus_ops definitions
[muen/linux.git] / sound / arm / pxa2xx-ac97.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
4  *
5  * Author:      Nicolas Pitre
6  * Created:     Dec 02, 2004
7  * Copyright:   MontaVista Software Inc.
8  */
9
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/dmaengine.h>
15 #include <linux/dma-mapping.h>
16
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/ac97_codec.h>
20 #include <sound/initval.h>
21 #include <sound/pxa2xx-lib.h>
22 #include <sound/dmaengine_pcm.h>
23
24 #include <mach/regs-ac97.h>
25 #include <mach/audio.h>
26
27 static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)
28 {
29         if (!pxa2xx_ac97_try_cold_reset())
30                 pxa2xx_ac97_try_warm_reset();
31
32         pxa2xx_ac97_finish_reset();
33 }
34
35 static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
36                                               unsigned short reg)
37 {
38         int ret;
39
40         ret = pxa2xx_ac97_read(ac97->num, reg);
41         if (ret < 0)
42                 return 0;
43         else
44                 return (unsigned short)(ret & 0xffff);
45 }
46
47 static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
48                                      unsigned short reg, unsigned short val)
49 {
50         int __always_unused ret;
51
52         ret = pxa2xx_ac97_write(ac97->num, reg, val);
53 }
54
55 static const struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
56         .read   = pxa2xx_ac97_legacy_read,
57         .write  = pxa2xx_ac97_legacy_write,
58         .reset  = pxa2xx_ac97_legacy_reset,
59 };
60
61 static struct snd_pcm *pxa2xx_ac97_pcm;
62 static struct snd_ac97 *pxa2xx_ac97_ac97;
63
64 static int pxa2xx_ac97_pcm_open(struct snd_pcm_substream *substream)
65 {
66         struct snd_pcm_runtime *runtime = substream->runtime;
67         pxa2xx_audio_ops_t *platform_ops;
68         int ret, i;
69
70         ret = pxa2xx_pcm_open(substream);
71         if (ret)
72                 return ret;
73
74         runtime->hw.channels_min = 2;
75         runtime->hw.channels_max = 2;
76
77         i = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
78                 AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
79         runtime->hw.rates = pxa2xx_ac97_ac97->rates[i];
80         snd_pcm_limit_hw_rates(runtime);
81
82         platform_ops = substream->pcm->card->dev->platform_data;
83         if (platform_ops && platform_ops->startup) {
84                 ret = platform_ops->startup(substream, platform_ops->priv);
85                 if (ret < 0)
86                         pxa2xx_pcm_close(substream);
87         }
88
89         return ret;
90 }
91
92 static int pxa2xx_ac97_pcm_close(struct snd_pcm_substream *substream)
93 {
94         pxa2xx_audio_ops_t *platform_ops;
95
96         platform_ops = substream->pcm->card->dev->platform_data;
97         if (platform_ops && platform_ops->shutdown)
98                 platform_ops->shutdown(substream, platform_ops->priv);
99
100         return 0;
101 }
102
103 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
104 {
105         struct snd_pcm_runtime *runtime = substream->runtime;
106         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
107                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
108         int ret;
109
110         ret = pxa2xx_pcm_prepare(substream);
111         if (ret < 0)
112                 return ret;
113
114         return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
115 }
116
117 #ifdef CONFIG_PM_SLEEP
118
119 static int pxa2xx_ac97_do_suspend(struct snd_card *card)
120 {
121         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
122
123         snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
124         snd_ac97_suspend(pxa2xx_ac97_ac97);
125         if (platform_ops && platform_ops->suspend)
126                 platform_ops->suspend(platform_ops->priv);
127
128         return pxa2xx_ac97_hw_suspend();
129 }
130
131 static int pxa2xx_ac97_do_resume(struct snd_card *card)
132 {
133         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
134         int rc;
135
136         rc = pxa2xx_ac97_hw_resume();
137         if (rc)
138                 return rc;
139
140         if (platform_ops && platform_ops->resume)
141                 platform_ops->resume(platform_ops->priv);
142         snd_ac97_resume(pxa2xx_ac97_ac97);
143         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
144
145         return 0;
146 }
147
148 static int pxa2xx_ac97_suspend(struct device *dev)
149 {
150         struct snd_card *card = dev_get_drvdata(dev);
151         int ret = 0;
152
153         if (card)
154                 ret = pxa2xx_ac97_do_suspend(card);
155
156         return ret;
157 }
158
159 static int pxa2xx_ac97_resume(struct device *dev)
160 {
161         struct snd_card *card = dev_get_drvdata(dev);
162         int ret = 0;
163
164         if (card)
165                 ret = pxa2xx_ac97_do_resume(card);
166
167         return ret;
168 }
169
170 static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
171 #endif
172
173 static const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {
174         .open           = pxa2xx_ac97_pcm_open,
175         .close          = pxa2xx_ac97_pcm_close,
176         .hw_params      = pxa2xx_pcm_hw_params,
177         .hw_free        = pxa2xx_pcm_hw_free,
178         .prepare        = pxa2xx_ac97_pcm_prepare,
179         .trigger        = pxa2xx_pcm_trigger,
180         .pointer        = pxa2xx_pcm_pointer,
181         .mmap           = pxa2xx_pcm_mmap,
182 };
183
184
185 static int pxa2xx_ac97_pcm_new(struct snd_card *card)
186 {
187         struct snd_pcm *pcm;
188         int stream, ret;
189
190         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
191         if (ret)
192                 goto out;
193
194         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
195
196         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
197         if (ret)
198                 goto out;
199
200         stream = SNDRV_PCM_STREAM_PLAYBACK;
201         snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
202         ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
203         if (ret)
204                 goto out;
205
206         stream = SNDRV_PCM_STREAM_CAPTURE;
207         snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
208         ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
209         if (ret)
210                 goto out;
211
212         pxa2xx_ac97_pcm = pcm;
213         ret = 0;
214
215  out:
216         return ret;
217 }
218
219 static int pxa2xx_ac97_probe(struct platform_device *dev)
220 {
221         struct snd_card *card;
222         struct snd_ac97_bus *ac97_bus;
223         struct snd_ac97_template ac97_template;
224         int ret;
225         pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
226
227         if (dev->id >= 0) {
228                 dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
229                 ret = -ENXIO;
230                 goto err_dev;
231         }
232
233         ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
234                            THIS_MODULE, 0, &card);
235         if (ret < 0)
236                 goto err;
237
238         strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
239
240         ret = pxa2xx_ac97_pcm_new(card);
241         if (ret)
242                 goto err;
243
244         ret = pxa2xx_ac97_hw_probe(dev);
245         if (ret)
246                 goto err;
247
248         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
249         if (ret)
250                 goto err_remove;
251         memset(&ac97_template, 0, sizeof(ac97_template));
252         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
253         if (ret)
254                 goto err_remove;
255
256         snprintf(card->shortname, sizeof(card->shortname),
257                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
258         snprintf(card->longname, sizeof(card->longname),
259                  "%s (%s)", dev->dev.driver->name, card->mixername);
260
261         if (pdata && pdata->codec_pdata[0])
262                 snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
263         ret = snd_card_register(card);
264         if (ret == 0) {
265                 platform_set_drvdata(dev, card);
266                 return 0;
267         }
268
269 err_remove:
270         pxa2xx_ac97_hw_remove(dev);
271 err:
272         if (card)
273                 snd_card_free(card);
274 err_dev:
275         return ret;
276 }
277
278 static int pxa2xx_ac97_remove(struct platform_device *dev)
279 {
280         struct snd_card *card = platform_get_drvdata(dev);
281
282         if (card) {
283                 snd_card_free(card);
284                 pxa2xx_ac97_hw_remove(dev);
285         }
286
287         return 0;
288 }
289
290 static struct platform_driver pxa2xx_ac97_driver = {
291         .probe          = pxa2xx_ac97_probe,
292         .remove         = pxa2xx_ac97_remove,
293         .driver         = {
294                 .name   = "pxa2xx-ac97",
295 #ifdef CONFIG_PM_SLEEP
296                 .pm     = &pxa2xx_ac97_pm_ops,
297 #endif
298         },
299 };
300
301 module_platform_driver(pxa2xx_ac97_driver);
302
303 MODULE_AUTHOR("Nicolas Pitre");
304 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
305 MODULE_LICENSE("GPL");
306 MODULE_ALIAS("platform:pxa2xx-ac97");