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