/arch/arm/mach-msm/qdsp6v2/snddev_ecodec.c
C | 387 lines | 292 code | 75 blank | 20 comment | 27 complexity | 3280911ec1e952b9b49270adefe3cc85 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15 * 02110-1301, USA.
16 *
17 */
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/clk.h>
21#include <linux/err.h>
22#include <linux/slab.h>
23#include <linux/gpio.h>
24#include <linux/delay.h>
25#include <linux/io.h>
26#include <asm/uaccess.h>
27#include <asm/io.h>
28#include <mach/clk.h>
29#include <mach/qdsp6v2/audio_dev_ctl.h>
30#include <mach/qdsp6v2/apr_audio.h>
31#include "snddev_ecodec.h"
32#include <mach/qdsp6v2/q6afe.h>
33
34#define ECODEC_SAMPLE_RATE 8000
35
36/* Context for each external codec device */
37struct snddev_ecodec_state {
38 struct snddev_ecodec_data *data;
39 u32 sample_rate;
40};
41
42/* Global state for the driver */
43struct snddev_ecodec_drv_state {
44 struct mutex dev_lock;
45 int ref_cnt; /* ensure one rx device at a time */
46 struct clk *ecodec_clk;
47};
48
49static struct snddev_ecodec_drv_state snddev_ecodec_drv;
50
51struct aux_pcm_state {
52 unsigned int dout;
53 unsigned int din;
54 unsigned int syncout;
55 unsigned int clkin_a;
56};
57
58static struct aux_pcm_state the_aux_pcm_state;
59
60static int aux_pcm_gpios_request(void)
61{
62 int rc = 0;
63
64 pr_debug("%s\n", __func__);
65 rc = gpio_request(the_aux_pcm_state.dout, "AUX PCM DOUT");
66 if (rc < 0) {
67 pr_err("%s: GPIO request for AUX PCM DOUT failed\n", __func__);
68 return rc;
69 }
70
71 rc = gpio_request(the_aux_pcm_state.din, "AUX PCM DIN");
72 if (rc < 0) {
73 pr_err("%s: GPIO request for AUX PCM DIN failed\n", __func__);
74 gpio_free(the_aux_pcm_state.dout);
75 return rc;
76 }
77
78 rc = gpio_request(the_aux_pcm_state.syncout, "AUX PCM SYNC OUT");
79 if (rc < 0) {
80 pr_err("%s: GPIO request for AUX PCM SYNC OUT failed\n",
81 __func__);
82 gpio_free(the_aux_pcm_state.dout);
83 gpio_free(the_aux_pcm_state.din);
84 return rc;
85 }
86
87 rc = gpio_request(the_aux_pcm_state.clkin_a, "AUX PCM CLKIN A");
88 if (rc < 0) {
89 pr_err("%s: GPIO request for AUX PCM CLKIN A failed\n",
90 __func__);
91 gpio_free(the_aux_pcm_state.dout);
92 gpio_free(the_aux_pcm_state.din);
93 gpio_free(the_aux_pcm_state.syncout);
94 return rc;
95 }
96
97 return rc;
98}
99
100static void aux_pcm_gpios_free(void)
101{
102 pr_debug("%s\n", __func__);
103 gpio_free(the_aux_pcm_state.dout);
104 gpio_free(the_aux_pcm_state.din);
105 gpio_free(the_aux_pcm_state.syncout);
106 gpio_free(the_aux_pcm_state.clkin_a);
107}
108
109static int get_aux_pcm_gpios(struct platform_device *pdev)
110{
111 int rc = 0;
112 struct resource *res;
113
114 /* Claim all of the GPIOs. */
115 res = platform_get_resource_byname(pdev, IORESOURCE_IO, "aux_pcm_dout");
116 if (!res) {
117 pr_err("%s: failed to get gpio AUX PCM DOUT\n", __func__);
118 return -ENODEV;
119 }
120
121 the_aux_pcm_state.dout = res->start;
122
123 res = platform_get_resource_byname(pdev, IORESOURCE_IO, "aux_pcm_din");
124 if (!res) {
125 pr_err("%s: failed to get gpio AUX PCM DIN\n", __func__);
126 return -ENODEV;
127 }
128
129 the_aux_pcm_state.din = res->start;
130
131 res = platform_get_resource_byname(pdev, IORESOURCE_IO,
132 "aux_pcm_syncout");
133 if (!res) {
134 pr_err("%s: failed to get gpio AUX PCM SYNC OUT\n", __func__);
135 return -ENODEV;
136 }
137
138 the_aux_pcm_state.syncout = res->start;
139
140 res = platform_get_resource_byname(pdev, IORESOURCE_IO,
141 "aux_pcm_clkin_a");
142 if (!res) {
143 pr_err("%s: failed to get gpio AUX PCM CLKIN A\n", __func__);
144 return -ENODEV;
145 }
146
147 the_aux_pcm_state.clkin_a = res->start;
148
149 return rc;
150}
151
152static int aux_pcm_probe(struct platform_device *pdev)
153{
154 int rc = 0;
155
156 rc = get_aux_pcm_gpios(pdev);
157 if (rc < 0) {
158 pr_err("%s: GPIO configuration failed\n", __func__);
159 return -ENODEV;
160 }
161 return rc;
162}
163
164static struct platform_driver aux_pcm_driver = {
165 .probe = aux_pcm_probe,
166 .driver = { .name = "msm_aux_pcm"}
167};
168
169static int snddev_ecodec_open(struct msm_snddev_info *dev_info)
170{
171 int rc;
172 struct snddev_ecodec_drv_state *drv = &snddev_ecodec_drv;
173 union afe_port_config afe_config;
174
175 pr_debug("%s\n", __func__);
176
177 mutex_lock(&drv->dev_lock);
178
179 if (dev_info->opened) {
180 pr_err("%s: ERROR: %s already opened\n", __func__,
181 dev_info->name);
182 mutex_unlock(&drv->dev_lock);
183 return -EBUSY;
184 }
185
186 if (drv->ref_cnt != 0) {
187 pr_debug("%s: opened %s\n", __func__, dev_info->name);
188 drv->ref_cnt++;
189 mutex_unlock(&drv->dev_lock);
190 return 0;
191 }
192
193 pr_info("%s: opening %s\n", __func__, dev_info->name);
194
195 rc = aux_pcm_gpios_request();
196 if (rc < 0) {
197 pr_err("%s: GPIO request failed\n", __func__);
198 return rc;
199 }
200
201 clk_reset(drv->ecodec_clk, CLK_RESET_ASSERT);
202
203 afe_config.pcm.mode = AFE_PCM_CFG_MODE_PCM;
204 afe_config.pcm.sync = AFE_PCM_CFG_SYNC_INT;
205 afe_config.pcm.frame = AFE_PCM_CFG_FRM_256BPF;
206 afe_config.pcm.quant = AFE_PCM_CFG_QUANT_LINEAR_NOPAD;
207 afe_config.pcm.slot = 0;
208 afe_config.pcm.data = AFE_PCM_CFG_CDATAOE_MASTER;
209
210 rc = afe_open(PCM_RX, &afe_config, ECODEC_SAMPLE_RATE);
211 if (rc < 0) {
212 pr_err("%s: afe open failed for PCM_RX\n", __func__);
213 goto err_rx_afe;
214 }
215
216 rc = afe_open(PCM_TX, &afe_config, ECODEC_SAMPLE_RATE);
217 if (rc < 0) {
218 pr_err("%s: afe open failed for PCM_TX\n", __func__);
219 goto err_tx_afe;
220 }
221
222 rc = clk_set_rate(drv->ecodec_clk, 2048000);
223 if (rc < 0) {
224 pr_err("%s: clk_set_rate failed\n", __func__);
225 goto err_clk;
226 }
227
228 clk_enable(drv->ecodec_clk);
229
230 clk_reset(drv->ecodec_clk, CLK_RESET_DEASSERT);
231
232 drv->ref_cnt++;
233 mutex_unlock(&drv->dev_lock);
234
235 return 0;
236
237err_clk:
238 afe_close(PCM_TX);
239err_tx_afe:
240 afe_close(PCM_RX);
241err_rx_afe:
242 aux_pcm_gpios_free();
243 mutex_unlock(&drv->dev_lock);
244 return -ENODEV;
245}
246
247int snddev_ecodec_close(struct msm_snddev_info *dev_info)
248{
249 struct snddev_ecodec_drv_state *drv = &snddev_ecodec_drv;
250
251 pr_debug("%s: closing %s\n", __func__, dev_info->name);
252
253 mutex_lock(&drv->dev_lock);
254
255 if (!dev_info->opened) {
256 pr_err("%s: ERROR: %s is not opened\n", __func__,
257 dev_info->name);
258 mutex_unlock(&drv->dev_lock);
259 return -EPERM;
260 }
261
262 drv->ref_cnt--;
263
264 if (drv->ref_cnt == 0) {
265
266 pr_info("%s: closing all devices\n", __func__);
267
268 clk_disable(drv->ecodec_clk);
269 aux_pcm_gpios_free();
270
271 afe_close(PCM_RX);
272 afe_close(PCM_TX);
273 }
274
275 mutex_unlock(&drv->dev_lock);
276
277 return 0;
278}
279
280int snddev_ecodec_set_freq(struct msm_snddev_info *dev_info, u32 rate)
281{
282 int rc = 0;
283
284 if (!dev_info) {
285 rc = -EINVAL;
286 goto error;
287 }
288 return ECODEC_SAMPLE_RATE;
289
290error:
291 return rc;
292}
293
294static int snddev_ecodec_probe(struct platform_device *pdev)
295{
296 int rc = 0;
297 struct snddev_ecodec_data *pdata;
298 struct msm_snddev_info *dev_info;
299 struct snddev_ecodec_state *ecodec;
300
301 if (!pdev || !pdev->dev.platform_data) {
302 printk(KERN_ALERT "Invalid caller\n");
303 rc = -1;
304 goto error;
305 }
306 pdata = pdev->dev.platform_data;
307
308 ecodec = kzalloc(sizeof(struct snddev_ecodec_state), GFP_KERNEL);
309 if (!ecodec) {
310 rc = -ENOMEM;
311 goto error;
312 }
313
314 dev_info = kzalloc(sizeof(struct msm_snddev_info), GFP_KERNEL);
315 if (!dev_info) {
316 kfree(ecodec);
317 rc = -ENOMEM;
318 goto error;
319 }
320
321 dev_info->name = pdata->name;
322 dev_info->copp_id = pdata->copp_id;
323 dev_info->private_data = (void *)ecodec;
324 dev_info->dev_ops.open = snddev_ecodec_open;
325 dev_info->dev_ops.close = snddev_ecodec_close;
326 dev_info->dev_ops.set_freq = snddev_ecodec_set_freq;
327 dev_info->dev_ops.enable_sidetone = NULL;
328 dev_info->capability = pdata->capability;
329 dev_info->opened = 0;
330
331 msm_snddev_register(dev_info);
332
333 ecodec->data = pdata;
334 ecodec->sample_rate = ECODEC_SAMPLE_RATE; /* Default to 8KHz */
335error:
336 return rc;
337}
338
339struct platform_driver snddev_ecodec_driver = {
340 .probe = snddev_ecodec_probe,
341 .driver = {.name = "msm_snddev_ecodec"}
342};
343
344int __init snddev_ecodec_init(void)
345{
346 int rc = 0;
347 struct snddev_ecodec_drv_state *drv = &snddev_ecodec_drv;
348
349 mutex_init(&drv->dev_lock);
350 drv->ref_cnt = 0;
351
352 drv->ecodec_clk = clk_get(NULL, "pcm_clk");
353 if (IS_ERR(drv->ecodec_clk)) {
354 pr_err("%s: could not get pcm_clk\n", __func__);
355 return PTR_ERR(drv->ecodec_clk);
356 }
357
358 rc = platform_driver_register(&aux_pcm_driver);
359 if (IS_ERR_VALUE(rc)) {
360 pr_err("%s: platform_driver_register for aux pcm failed\n",
361 __func__);
362 goto error_aux_pcm_platform_driver;
363 }
364
365 rc = platform_driver_register(&snddev_ecodec_driver);
366 if (IS_ERR_VALUE(rc)) {
367 pr_err("%s: platform_driver_register for ecodec failed\n",
368 __func__);
369 goto error_ecodec_platform_driver;
370 }
371
372 return 0;
373
374error_ecodec_platform_driver:
375 platform_driver_unregister(&aux_pcm_driver);
376error_aux_pcm_platform_driver:
377 clk_put(drv->ecodec_clk);
378
379 pr_err("%s: encounter error\n", __func__);
380 return -ENODEV;
381}
382
383device_initcall(snddev_ecodec_init);
384
385MODULE_DESCRIPTION("ECodec Sound Device driver");
386MODULE_VERSION("1.0");
387MODULE_LICENSE("GPL v2");