418 lines
10 KiB
C
418 lines
10 KiB
C
/*
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* STMicroelectronics System-on-Chips' GPIO-controlled ADC/DAC driver
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*
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* Copyright (c) 2005-2011 STMicroelectronics Limited
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*
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* Author: Pawel Moll <pawel.moll@st.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/gpio.h>
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#include <sound/core.h>
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#include <sound/info.h>
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#include <sound/stm.h>
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#include "common.h"
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static int snd_stm_debug_level;
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module_param_named(debug, snd_stm_debug_level, int, S_IRUGO | S_IWUSR);
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/*
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* Internal DAC instance structure
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*/
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struct snd_stm_conv_gpio {
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/* System informations */
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const char *dev_name;
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struct snd_stm_conv_converter *converter;
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struct snd_stm_conv_gpio_info *info;
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struct snd_stm_conv_ops ops;
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/* Runtime data */
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int may_sleep;
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struct work_struct work; /* Used if may_sleep */
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int work_enable_value;
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int work_mute_value;
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spinlock_t work_lock; /* Protects work_*_value */
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struct snd_info_entry *proc_entry;
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snd_stm_magic_field;
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};
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/*
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* Sleeping-safe GPIO access implementation
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*/
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static void snd_stm_conv_gpio_work(struct work_struct *work)
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{
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struct snd_stm_conv_gpio *conv_gpio = container_of(work,
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struct snd_stm_conv_gpio, work);
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int enable_value, mute_value;
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snd_stm_printd(1, "snd_stm_conv_gpio_work(work=%p)\n", work);
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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spin_lock(&conv_gpio->work_lock);
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enable_value = conv_gpio->work_enable_value;
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conv_gpio->work_enable_value = -1;
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mute_value = conv_gpio->work_mute_value;
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conv_gpio->work_mute_value = -1;
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spin_unlock(&conv_gpio->work_lock);
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if (enable_value != -1)
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gpio_set_value_cansleep(conv_gpio->info->enable_gpio,
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enable_value);
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if (mute_value != -1)
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gpio_set_value_cansleep(conv_gpio->info->mute_gpio,
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mute_value);
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}
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static void snd_stm_conv_gpio_set_value(struct snd_stm_conv_gpio *conv_gpio,
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int enable_not_mute, int value)
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{
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snd_stm_printd(1, "snd_stm_conv_gpio_set_value(conv_gpio=%p, "
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"enable_not_mute=%d, value=%d)\n",
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conv_gpio, enable_not_mute, value);
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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if (conv_gpio->may_sleep) {
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spin_lock(&conv_gpio->work_lock);
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if (enable_not_mute)
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conv_gpio->work_enable_value = value;
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else
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conv_gpio->work_mute_value = value;
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schedule_work(&conv_gpio->work);
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spin_unlock(&conv_gpio->work_lock);
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} else {
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gpio_set_value(enable_not_mute ? conv_gpio->info->enable_gpio :
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conv_gpio->info->mute_gpio, value);
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}
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}
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/*
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* Converter interface implementation
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*/
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static unsigned int snd_stm_conv_gpio_get_format(void *priv)
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{
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struct snd_stm_conv_gpio *conv_gpio = priv;
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snd_stm_printd(1, "snd_stm_conv_gpio_get_format(priv=%p)\n", priv);
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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return conv_gpio->info->format;
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}
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static int snd_stm_conv_gpio_get_oversampling(void *priv)
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{
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struct snd_stm_conv_gpio *conv_gpio = priv;
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snd_stm_printd(1, "snd_stm_conv_gpio_get_oversampling(priv=%p)\n",
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priv);
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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return conv_gpio->info->oversampling;
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}
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static int snd_stm_conv_gpio_set_enabled(int enabled, void *priv)
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{
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struct snd_stm_conv_gpio *conv_gpio = priv;
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snd_stm_printd(1, "snd_stm_conv_gpio_enable(enabled=%d, priv=%p)\n",
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enabled, priv);
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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BUG_ON(!conv_gpio->info->enable_supported);
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snd_stm_printd(1, "%sabling DAC %s's.\n", enabled ? "En" : "Dis",
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conv_gpio->dev_name);
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snd_stm_conv_gpio_set_value(conv_gpio, 1,
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enabled ? conv_gpio->info->enable_value :
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!conv_gpio->info->enable_value);
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return 0;
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}
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static int snd_stm_conv_gpio_set_muted(int muted, void *priv)
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{
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struct snd_stm_conv_gpio *conv_gpio = priv;
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snd_stm_printd(1, "snd_stm_conv_gpio_set_muted(muted=%d, priv=%p)\n",
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muted, priv);
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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BUG_ON(!conv_gpio->info->mute_supported);
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snd_stm_printd(1, "%suting DAC %s.\n", muted ? "M" : "Unm",
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conv_gpio->dev_name);
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snd_stm_conv_gpio_set_value(conv_gpio, 0,
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muted ? conv_gpio->info->mute_value :
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!conv_gpio->info->mute_value);
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return 0;
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}
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/*
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* Procfs status callback
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*/
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static void snd_stm_conv_gpio_read_info(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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struct snd_stm_conv_gpio *conv_gpio = entry->private_data;
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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snd_iprintf(buffer, "--- %s ---\n", conv_gpio->dev_name);
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snd_iprintf(buffer, "enable_gpio(%d) = %d\n",
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conv_gpio->info->enable_gpio,
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gpio_get_value(conv_gpio->info->enable_gpio));
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if (conv_gpio->info->mute_supported)
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snd_iprintf(buffer, "mute_gpio(%d) = %d\n",
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conv_gpio->info->mute_gpio,
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gpio_get_value(conv_gpio->info->mute_gpio));
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snd_iprintf(buffer, "\n");
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}
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/*
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* Platform driver routines
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*/
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static int snd_stm_conv_gpio_probe(struct platform_device *pdev)
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{
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int result = 0;
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struct snd_stm_conv_gpio *conv_gpio;
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snd_stm_printd(0, "%s('%s')\n", __func__, dev_name(&pdev->dev));
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BUG_ON(!pdev->dev.platform_data);
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conv_gpio = kzalloc(sizeof(*conv_gpio), GFP_KERNEL);
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if (!conv_gpio) {
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snd_stm_printe("Can't allocate memory "
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"for a device description!\n");
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result = -ENOMEM;
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goto error_alloc;
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}
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snd_stm_magic_set(conv_gpio);
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conv_gpio->dev_name = dev_name(&pdev->dev);
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conv_gpio->info = pdev->dev.platform_data;
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conv_gpio->ops.get_format = snd_stm_conv_gpio_get_format;
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conv_gpio->ops.get_oversampling = snd_stm_conv_gpio_get_oversampling;
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if (conv_gpio->info->enable_supported)
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conv_gpio->ops.set_enabled = snd_stm_conv_gpio_set_enabled;
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if (conv_gpio->info->mute_supported)
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conv_gpio->ops.set_muted = snd_stm_conv_gpio_set_muted;
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/* Get connections */
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BUG_ON(!conv_gpio->info->source_bus_id);
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snd_stm_printd(0, "This DAC is attached to PCM player '%s'.\n",
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conv_gpio->info->source_bus_id);
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conv_gpio->converter = snd_stm_conv_register_converter(
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conv_gpio->info->group, &conv_gpio->ops, conv_gpio,
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&platform_bus_type, conv_gpio->info->source_bus_id,
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conv_gpio->info->channel_from,
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conv_gpio->info->channel_to, NULL);
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if (!conv_gpio->converter) {
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snd_stm_printe("Can't attach to PCM player!\n");
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result = -EINVAL;
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goto error_attach;
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}
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/* Reserve & initialize GPIO lines (enabled & mute) */
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if (conv_gpio->info->enable_supported) {
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result = gpio_request(conv_gpio->info->enable_gpio,
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conv_gpio->dev_name);
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if (result != 0) {
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snd_stm_printe("Can't reserve 'enable' GPIO line!\n");
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goto error_gpio_request_enable;
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}
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if (gpio_direction_output(conv_gpio->info->enable_gpio,
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!conv_gpio->info->enable_value) != 0) {
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snd_stm_printe("Can't set 'enable' GPIO line as "
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"output!\n");
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goto error_gpio_direction_output_enable;
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}
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conv_gpio->may_sleep = gpio_cansleep(
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conv_gpio->info->enable_gpio);
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}
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if (conv_gpio->info->mute_supported) {
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result = gpio_request(conv_gpio->info->mute_gpio,
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conv_gpio->dev_name);
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if (result != 0) {
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snd_stm_printe("Can't reserve 'mute' GPIO line!\n");
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goto error_gpio_request_mute;
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}
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if (gpio_direction_output(conv_gpio->info->mute_gpio,
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conv_gpio->info->mute_value) != 0) {
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snd_stm_printe("Can't set 'mute' GPIO line as output!"
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"\n");
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goto error_gpio_direction_output_mute;
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}
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conv_gpio->may_sleep |= gpio_cansleep(
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conv_gpio->info->mute_gpio);
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}
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if (conv_gpio->may_sleep) {
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INIT_WORK(&conv_gpio->work, snd_stm_conv_gpio_work);
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spin_lock_init(&conv_gpio->work_lock);
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conv_gpio->work_enable_value = -1;
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conv_gpio->work_mute_value = -1;
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}
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/* Additional procfs info */
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snd_stm_info_register(&conv_gpio->proc_entry,
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conv_gpio->dev_name,
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snd_stm_conv_gpio_read_info,
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conv_gpio);
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/* Done now */
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platform_set_drvdata(pdev, conv_gpio);
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return 0;
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error_gpio_direction_output_mute:
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if (conv_gpio->info->mute_supported)
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gpio_free(conv_gpio->info->mute_gpio);
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error_gpio_request_mute:
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error_gpio_direction_output_enable:
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if (conv_gpio->info->enable_supported)
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gpio_free(conv_gpio->info->enable_gpio);
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error_gpio_request_enable:
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snd_stm_conv_unregister_converter(conv_gpio->converter);
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error_attach:
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snd_stm_magic_clear(conv_gpio);
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kfree(conv_gpio);
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error_alloc:
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return result;
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}
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static int snd_stm_conv_gpio_remove(struct platform_device *pdev)
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{
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struct snd_stm_conv_gpio *conv_gpio = platform_get_drvdata(pdev);
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BUG_ON(!conv_gpio);
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BUG_ON(!snd_stm_magic_valid(conv_gpio));
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snd_stm_conv_unregister_converter(conv_gpio->converter);
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/* Remove procfs entry */
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snd_stm_info_unregister(conv_gpio->proc_entry);
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/* Wait for the possibly scheduled work... */
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if (conv_gpio->may_sleep)
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flush_scheduled_work();
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/* Muting and disabling - just to be sure ;-) */
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if (conv_gpio->info->mute_supported) {
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gpio_set_value_cansleep(conv_gpio->info->mute_gpio,
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conv_gpio->info->mute_value);
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gpio_free(conv_gpio->info->mute_gpio);
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}
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if (conv_gpio->info->enable_supported) {
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gpio_set_value_cansleep(conv_gpio->info->enable_gpio,
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!conv_gpio->info->enable_value);
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gpio_free(conv_gpio->info->enable_gpio);
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}
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snd_stm_magic_clear(conv_gpio);
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kfree(conv_gpio);
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return 0;
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}
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static struct platform_driver snd_stm_conv_gpio_driver = {
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.driver.name = "snd_conv_gpio",
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.probe = snd_stm_conv_gpio_probe,
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.remove = snd_stm_conv_gpio_remove,
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};
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/*
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* Initialization
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*/
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static int __init snd_stm_conv_gpio_init(void)
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{
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return platform_driver_register(&snd_stm_conv_gpio_driver);
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}
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static void __exit snd_stm_conv_gpio_exit(void)
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{
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platform_driver_unregister(&snd_stm_conv_gpio_driver);
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}
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MODULE_AUTHOR("Pawel Moll <pawel.moll@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics GPIO-controlled audio converter driver");
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MODULE_LICENSE("GPL");
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module_init(snd_stm_conv_gpio_init);
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module_exit(snd_stm_conv_gpio_exit);
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