/arch/arm/mach-fsm/qdsp6/pcm_out.c

  1/* arch/arm/mach-msm/qdsp6/pcm_out.c
  2 *
  3 * Copyright (C) 2009 Google, Inc.
  4 * Author: Brian Swetland <swetland@google.com>
  5 *
  6 * This software is licensed under the terms of the GNU General Public
  7 * License version 2, as published by the Free Software Foundation, and
  8 * may be copied, distributed, and modified under those terms.
  9 *
 10 * This program is distributed in the hope that it will be useful,
 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 * GNU General Public License for more details.
 14 *
 15 */
 16
 17#include <linux/fs.h>
 18#include <linux/module.h>
 19#include <linux/miscdevice.h>
 20#include <linux/mutex.h>
 21#include <linux/sched.h>
 22#include <linux/wait.h>
 23#include <linux/uaccess.h>
 24
 25#include <linux/msm_audio.h>
 26
 27#include <mach/msm_qdsp6_audio.h>
 28#include <mach/debug_mm.h>
 29
 30void audio_client_dump(struct audio_client *ac);
 31
 32#define BUFSZ (3072)
 33
 34struct pcm {
 35	struct mutex lock;
 36	struct audio_client *ac;
 37	uint32_t sample_rate;
 38	uint32_t channel_count;
 39	size_t buffer_size;
 40};
 41
 42static long pcm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 43{
 44	struct pcm *pcm = file->private_data;
 45	int rc = 0;
 46
 47	if (cmd == AUDIO_GET_STATS) {
 48		struct msm_audio_stats stats;
 49		memset(&stats, 0, sizeof(stats));
 50		if (copy_to_user((void*) arg, &stats, sizeof(stats)))
 51			return -EFAULT;
 52		return 0;
 53	}
 54
 55	mutex_lock(&pcm->lock);
 56	switch (cmd) {
 57	case AUDIO_SET_VOLUME: {
 58		int vol;
 59		if (copy_from_user(&vol, (void*) arg, sizeof(vol))) {
 60			rc = -EFAULT;
 61			break;
 62		}
 63		rc = q6audio_set_stream_volume(pcm->ac, vol);
 64		break;
 65	}
 66	case AUDIO_START: {
 67		uint32_t acdb_id;
 68		if (arg == 0) {
 69			acdb_id = 0;
 70		} else if (copy_from_user(&acdb_id, (void*) arg, sizeof(acdb_id))) {
 71			pr_info("[%s:%s] copy acdb_id from user failed\n",
 72					__MM_FILE__, __func__);
 73			rc = -EFAULT;
 74			break;
 75		}
 76		if (pcm->ac) {
 77			rc = -EBUSY;
 78		} else {
 79			pcm->ac = q6audio_open_pcm(pcm->buffer_size,
 80						pcm->sample_rate,
 81						pcm->channel_count,
 82						AUDIO_FLAG_WRITE, acdb_id);
 83			if (!pcm->ac)
 84				rc = -ENOMEM;
 85		}
 86		break;
 87	}
 88	case AUDIO_STOP:
 89		break;
 90	case AUDIO_FLUSH:
 91		break;
 92	case AUDIO_SET_CONFIG: {
 93		struct msm_audio_config config;
 94		if (pcm->ac) {
 95			rc = -EBUSY;
 96			break;
 97		}
 98		if (copy_from_user(&config, (void*) arg, sizeof(config))) {
 99			rc = -EFAULT;
100			break;
101		}
102		if (config.channel_count < 1 || config.channel_count > 2) {
103			rc = -EINVAL;
104			break;
105		}
106		if (config.sample_rate < 8000 || config.sample_rate > 48000) {
107			rc = -EINVAL;
108			break;
109		}
110		if (config.buffer_size < 128 || config.buffer_size > 8192) {
111			rc = -EINVAL;
112			break;
113		}
114		pcm->sample_rate = config.sample_rate;
115		pcm->channel_count = config.channel_count;
116		pcm->buffer_size = config.buffer_size;
117		break;
118	}
119	case AUDIO_GET_CONFIG: {
120		struct msm_audio_config config;
121		config.buffer_size = pcm->buffer_size;
122		config.buffer_count = 2;
123		config.sample_rate = pcm->sample_rate;
124		config.channel_count = pcm->channel_count;
125		config.unused[0] = 0;
126		config.unused[1] = 0;
127		config.unused[2] = 0;
128		if (copy_to_user((void*) arg, &config, sizeof(config))) {
129			rc = -EFAULT;
130		}
131		break;
132	}
133	case AUDIO_SET_EQ: {
134		struct msm_audio_eq_stream_config eq_config;
135		if (copy_from_user(&eq_config, (void *) arg,
136						sizeof(eq_config))) {
137			rc = -EFAULT;
138			break;
139		}
140		rc = q6audio_set_stream_eq_pcm(pcm->ac, (void *) &eq_config);
141		break;
142	}
143	default:
144		rc = -EINVAL;
145	}
146	mutex_unlock(&pcm->lock);
147	return rc;
148}
149
150static int pcm_open(struct inode *inode, struct file *file)
151{
152	struct pcm *pcm;
153
154	pr_info("[%s:%s] open\n", __MM_FILE__, __func__);
155	pcm = kzalloc(sizeof(struct pcm), GFP_KERNEL);
156
157	if (!pcm)
158		return -ENOMEM;
159
160	mutex_init(&pcm->lock);
161	pcm->channel_count = 2;
162	pcm->sample_rate = 44100;
163	pcm->buffer_size = BUFSZ;
164	file->private_data = pcm;
165	return 0;
166}
167
168static ssize_t pcm_write(struct file *file, const char __user *buf,
169			   size_t count, loff_t *pos)
170{
171	struct pcm *pcm = file->private_data;
172	struct audio_client *ac;
173	struct audio_buffer *ab;
174	const char __user *start = buf;
175	int xfer;
176
177	if (!pcm->ac)
178		pcm_ioctl(file, AUDIO_START, 0);
179
180	ac = pcm->ac;
181	if (!ac)
182		return -ENODEV;
183
184	while (count > 0) {
185		ab = ac->buf + ac->cpu_buf;
186
187		if (ab->used)
188			if (!wait_event_timeout(ac->wait, (ab->used == 0), 5*HZ)) {
189				audio_client_dump(ac);
190				pr_err("[%s:%s] timeout. dsp dead?\n",
191						__MM_FILE__, __func__);
192				q6audio_dsp_not_responding();
193			}
194
195		xfer = count;
196		if (xfer > ab->size)
197			xfer = ab->size;
198
199		if (copy_from_user(ab->data, buf, xfer)) 
200			return -EFAULT;
201
202		buf += xfer;
203		count -= xfer;
204
205		ab->used = 1;
206		ab->actual_size = xfer;
207		q6audio_write(ac, ab);
208		ac->cpu_buf ^= 1;
209	}
210
211	return buf - start;
212}
213
214static int pcm_release(struct inode *inode, struct file *file)
215{
216	struct pcm *pcm = file->private_data;
217	if (pcm->ac)
218		q6audio_close(pcm->ac);
219	kfree(pcm);
220	pr_info("[%s:%s] release\n", __MM_FILE__, __func__);
221	return 0;
222}
223
224static struct file_operations pcm_fops = {
225	.owner		= THIS_MODULE,
226	.open		= pcm_open,
227	.write		= pcm_write,
228	.release	= pcm_release,
229	.unlocked_ioctl	= pcm_ioctl,
230};
231
232struct miscdevice pcm_misc = {
233	.minor	= MISC_DYNAMIC_MINOR,
234	.name	= "msm_pcm_out",
235	.fops	= &pcm_fops,
236};
237
238static int __init pcm_init(void) {
239	return misc_register(&pcm_misc);
240}
241
242device_initcall(pcm_init);