M7350/kernel/arch/arm/mach-msm/qdsp6v2/snddev_ecodec.c

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2024-09-09 08:52:07 +00:00
/* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <mach/clk.h>
#include <mach/qdsp6v2/audio_dev_ctl.h>
#include <sound/apr_audio.h>
#include <sound/q6afe.h>
#include "snddev_ecodec.h"
#define ECODEC_SAMPLE_RATE 8000
/* Context for each external codec device */
struct snddev_ecodec_state {
struct snddev_ecodec_data *data;
u32 sample_rate;
};
/* Global state for the driver */
struct snddev_ecodec_drv_state {
struct mutex dev_lock;
int ref_cnt; /* ensure one rx device at a time */
struct clk *ecodec_clk;
};
static struct snddev_ecodec_drv_state snddev_ecodec_drv;
struct aux_pcm_state {
unsigned int dout;
unsigned int din;
unsigned int syncout;
unsigned int clkin_a;
};
static struct aux_pcm_state the_aux_pcm_state;
static int aux_pcm_gpios_request(void)
{
int rc = 0;
pr_debug("%s\n", __func__);
rc = gpio_request(the_aux_pcm_state.dout, "AUX PCM DOUT");
if (rc < 0) {
pr_err("%s: GPIO request for AUX PCM DOUT failed\n", __func__);
return rc;
}
rc = gpio_request(the_aux_pcm_state.din, "AUX PCM DIN");
if (rc < 0) {
pr_err("%s: GPIO request for AUX PCM DIN failed\n", __func__);
gpio_free(the_aux_pcm_state.dout);
return rc;
}
rc = gpio_request(the_aux_pcm_state.syncout, "AUX PCM SYNC OUT");
if (rc < 0) {
pr_err("%s: GPIO request for AUX PCM SYNC OUT failed\n",
__func__);
gpio_free(the_aux_pcm_state.dout);
gpio_free(the_aux_pcm_state.din);
return rc;
}
rc = gpio_request(the_aux_pcm_state.clkin_a, "AUX PCM CLKIN A");
if (rc < 0) {
pr_err("%s: GPIO request for AUX PCM CLKIN A failed\n",
__func__);
gpio_free(the_aux_pcm_state.dout);
gpio_free(the_aux_pcm_state.din);
gpio_free(the_aux_pcm_state.syncout);
return rc;
}
return rc;
}
static void aux_pcm_gpios_free(void)
{
pr_debug("%s\n", __func__);
gpio_free(the_aux_pcm_state.dout);
gpio_free(the_aux_pcm_state.din);
gpio_free(the_aux_pcm_state.syncout);
gpio_free(the_aux_pcm_state.clkin_a);
}
static int get_aux_pcm_gpios(struct platform_device *pdev)
{
int rc = 0;
struct resource *res;
/* Claim all of the GPIOs. */
res = platform_get_resource_byname(pdev, IORESOURCE_IO, "aux_pcm_dout");
if (!res) {
pr_err("%s: failed to get gpio AUX PCM DOUT\n", __func__);
return -ENODEV;
}
the_aux_pcm_state.dout = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_IO, "aux_pcm_din");
if (!res) {
pr_err("%s: failed to get gpio AUX PCM DIN\n", __func__);
return -ENODEV;
}
the_aux_pcm_state.din = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_IO,
"aux_pcm_syncout");
if (!res) {
pr_err("%s: failed to get gpio AUX PCM SYNC OUT\n", __func__);
return -ENODEV;
}
the_aux_pcm_state.syncout = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_IO,
"aux_pcm_clkin_a");
if (!res) {
pr_err("%s: failed to get gpio AUX PCM CLKIN A\n", __func__);
return -ENODEV;
}
the_aux_pcm_state.clkin_a = res->start;
return rc;
}
static int aux_pcm_probe(struct platform_device *pdev)
{
int rc = 0;
rc = get_aux_pcm_gpios(pdev);
if (rc < 0) {
pr_err("%s: GPIO configuration failed\n", __func__);
return -ENODEV;
}
return rc;
}
static struct platform_driver aux_pcm_driver = {
.probe = aux_pcm_probe,
.driver = { .name = "msm_aux_pcm"}
};
static int snddev_ecodec_open(struct msm_snddev_info *dev_info)
{
int rc;
struct snddev_ecodec_drv_state *drv = &snddev_ecodec_drv;
union afe_port_config afe_config;
pr_debug("%s\n", __func__);
mutex_lock(&drv->dev_lock);
if (dev_info->opened) {
pr_err("%s: ERROR: %s already opened\n", __func__,
dev_info->name);
mutex_unlock(&drv->dev_lock);
return -EBUSY;
}
if (drv->ref_cnt != 0) {
pr_debug("%s: opened %s\n", __func__, dev_info->name);
drv->ref_cnt++;
mutex_unlock(&drv->dev_lock);
return 0;
}
pr_info("%s: opening %s\n", __func__, dev_info->name);
rc = aux_pcm_gpios_request();
if (rc < 0) {
pr_err("%s: GPIO request failed\n", __func__);
return rc;
}
clk_reset(drv->ecodec_clk, CLK_RESET_ASSERT);
afe_config.pcm.mode = AFE_PCM_CFG_MODE_PCM;
afe_config.pcm.sync = AFE_PCM_CFG_SYNC_INT;
afe_config.pcm.frame = AFE_PCM_CFG_FRM_256BPF;
afe_config.pcm.quant = AFE_PCM_CFG_QUANT_LINEAR_NOPAD;
afe_config.pcm.slot = 0;
afe_config.pcm.data = AFE_PCM_CFG_CDATAOE_MASTER;
rc = afe_open(PCM_RX, &afe_config, ECODEC_SAMPLE_RATE);
if (rc < 0) {
pr_err("%s: afe open failed for PCM_RX\n", __func__);
goto err_rx_afe;
}
rc = afe_open(PCM_TX, &afe_config, ECODEC_SAMPLE_RATE);
if (rc < 0) {
pr_err("%s: afe open failed for PCM_TX\n", __func__);
goto err_tx_afe;
}
rc = clk_set_rate(drv->ecodec_clk, 2048000);
if (rc < 0) {
pr_err("%s: clk_set_rate failed\n", __func__);
goto err_clk;
}
clk_prepare_enable(drv->ecodec_clk);
clk_reset(drv->ecodec_clk, CLK_RESET_DEASSERT);
drv->ref_cnt++;
mutex_unlock(&drv->dev_lock);
return 0;
err_clk:
afe_close(PCM_TX);
err_tx_afe:
afe_close(PCM_RX);
err_rx_afe:
aux_pcm_gpios_free();
mutex_unlock(&drv->dev_lock);
return -ENODEV;
}
int snddev_ecodec_close(struct msm_snddev_info *dev_info)
{
struct snddev_ecodec_drv_state *drv = &snddev_ecodec_drv;
pr_debug("%s: closing %s\n", __func__, dev_info->name);
mutex_lock(&drv->dev_lock);
if (!dev_info->opened) {
pr_err("%s: ERROR: %s is not opened\n", __func__,
dev_info->name);
mutex_unlock(&drv->dev_lock);
return -EPERM;
}
drv->ref_cnt--;
if (drv->ref_cnt == 0) {
pr_info("%s: closing all devices\n", __func__);
clk_disable_unprepare(drv->ecodec_clk);
aux_pcm_gpios_free();
afe_close(PCM_RX);
afe_close(PCM_TX);
}
mutex_unlock(&drv->dev_lock);
return 0;
}
int snddev_ecodec_set_freq(struct msm_snddev_info *dev_info, u32 rate)
{
int rc = 0;
if (!dev_info) {
rc = -EINVAL;
goto error;
}
return ECODEC_SAMPLE_RATE;
error:
return rc;
}
static int snddev_ecodec_probe(struct platform_device *pdev)
{
int rc = 0;
struct snddev_ecodec_data *pdata;
struct msm_snddev_info *dev_info;
struct snddev_ecodec_state *ecodec;
if (!pdev || !pdev->dev.platform_data) {
printk(KERN_ALERT "Invalid caller\n");
rc = -1;
goto error;
}
pdata = pdev->dev.platform_data;
ecodec = kzalloc(sizeof(struct snddev_ecodec_state), GFP_KERNEL);
if (!ecodec) {
rc = -ENOMEM;
goto error;
}
dev_info = kzalloc(sizeof(struct msm_snddev_info), GFP_KERNEL);
if (!dev_info) {
kfree(ecodec);
rc = -ENOMEM;
goto error;
}
dev_info->name = pdata->name;
dev_info->copp_id = pdata->copp_id;
dev_info->private_data = (void *)ecodec;
dev_info->dev_ops.open = snddev_ecodec_open;
dev_info->dev_ops.close = snddev_ecodec_close;
dev_info->dev_ops.set_freq = snddev_ecodec_set_freq;
dev_info->dev_ops.enable_sidetone = NULL;
dev_info->capability = pdata->capability;
dev_info->opened = 0;
msm_snddev_register(dev_info);
ecodec->data = pdata;
ecodec->sample_rate = ECODEC_SAMPLE_RATE; /* Default to 8KHz */
error:
return rc;
}
struct platform_driver snddev_ecodec_driver = {
.probe = snddev_ecodec_probe,
.driver = {.name = "msm_snddev_ecodec"}
};
int __init snddev_ecodec_init(void)
{
int rc = 0;
struct snddev_ecodec_drv_state *drv = &snddev_ecodec_drv;
mutex_init(&drv->dev_lock);
drv->ref_cnt = 0;
drv->ecodec_clk = clk_get_sys(NULL, "pcm_clk");
if (IS_ERR(drv->ecodec_clk)) {
pr_err("%s: could not get pcm_clk\n", __func__);
return PTR_ERR(drv->ecodec_clk);
}
rc = platform_driver_register(&aux_pcm_driver);
if (IS_ERR_VALUE(rc)) {
pr_err("%s: platform_driver_register for aux pcm failed\n",
__func__);
goto error_aux_pcm_platform_driver;
}
rc = platform_driver_register(&snddev_ecodec_driver);
if (IS_ERR_VALUE(rc)) {
pr_err("%s: platform_driver_register for ecodec failed\n",
__func__);
goto error_ecodec_platform_driver;
}
return 0;
error_ecodec_platform_driver:
platform_driver_unregister(&aux_pcm_driver);
error_aux_pcm_platform_driver:
clk_put(drv->ecodec_clk);
pr_err("%s: encounter error\n", __func__);
return -ENODEV;
}
device_initcall(snddev_ecodec_init);
MODULE_DESCRIPTION("ECodec Sound Device driver");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL v2");