368 lines
9.0 KiB
C
368 lines
9.0 KiB
C
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/*
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* STMicroelectronics System-on-Chips' I2C-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/i2c.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 converter instance structure
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*/
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struct snd_stm_conv_i2c {
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/* System informations */
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struct i2c_client *client;
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struct snd_stm_conv_converter *converter;
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struct snd_stm_conv_i2c_info *info;
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struct snd_stm_conv_ops ops;
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/* Runtime data */
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struct work_struct work;
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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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* Implementation
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*/
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static void snd_stm_conv_i2c_work(struct work_struct *work)
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{
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struct snd_stm_conv_i2c *conv_i2c = container_of(work,
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struct snd_stm_conv_i2c, work);
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int enable_value, mute_value;
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const char *cmd;
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int cmd_len;
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snd_stm_printd(1, "snd_stm_conv_i2c_work(work=%p)\n", work);
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BUG_ON(!conv_i2c);
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BUG_ON(!snd_stm_magic_valid(conv_i2c));
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spin_lock(&conv_i2c->work_lock);
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enable_value = conv_i2c->work_enable_value;
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conv_i2c->work_enable_value = -1;
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mute_value = conv_i2c->work_mute_value;
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conv_i2c->work_mute_value = -1;
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spin_unlock(&conv_i2c->work_lock);
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cmd = NULL;
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if (enable_value == 1) {
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cmd = conv_i2c->info->enable_cmd;
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cmd_len = conv_i2c->info->enable_cmd_len;
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} else if (enable_value == 0) {
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cmd = conv_i2c->info->disable_cmd;
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cmd_len = conv_i2c->info->disable_cmd_len;
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}
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if (cmd) {
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int result = i2c_master_send(conv_i2c->client, cmd, cmd_len);
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if (result != cmd_len)
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snd_stm_printe("WARNING! Failed to %sable I2C converter"
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" '%s'! (%d)\n",
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enable_value ? "en" : "dis",
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dev_name(&conv_i2c->client->dev),
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result);
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}
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cmd = NULL;
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if (mute_value == 1) {
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cmd = conv_i2c->info->mute_cmd;
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cmd_len = conv_i2c->info->mute_cmd_len;
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} else if (mute_value == 0) {
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cmd = conv_i2c->info->unmute_cmd;
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cmd_len = conv_i2c->info->unmute_cmd_len;
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}
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if (cmd) {
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int result = i2c_master_send(conv_i2c->client, cmd, cmd_len);
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if (result != cmd_len)
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snd_stm_printe("WARNING! Failed to %smute I2C converter"
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" '%s'! (%d)\n", mute_value ? "" : "un",
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dev_name(&conv_i2c->client->dev),
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result);
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}
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}
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static unsigned int snd_stm_conv_i2c_get_format(void *priv)
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{
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struct snd_stm_conv_i2c *conv_i2c = priv;
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snd_stm_printd(1, "snd_stm_conv_i2c_get_format(priv=%p)\n", priv);
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BUG_ON(!conv_i2c);
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BUG_ON(!snd_stm_magic_valid(conv_i2c));
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return conv_i2c->info->format;
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}
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static int snd_stm_conv_i2c_get_oversampling(void *priv)
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{
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struct snd_stm_conv_i2c *conv_i2c = priv;
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snd_stm_printd(1, "snd_stm_conv_i2c_get_oversampling(priv=%p)\n",
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priv);
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BUG_ON(!conv_i2c);
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BUG_ON(!snd_stm_magic_valid(conv_i2c));
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return conv_i2c->info->oversampling;
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}
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static int snd_stm_conv_i2c_set_enabled(int enabled, void *priv)
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{
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struct snd_stm_conv_i2c *conv_i2c = priv;
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snd_stm_printd(1, "snd_stm_conv_i2c_enable(enabled=%d, priv=%p)\n",
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enabled, priv);
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BUG_ON(!conv_i2c);
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BUG_ON(!snd_stm_magic_valid(conv_i2c));
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BUG_ON(!conv_i2c->info->enable_supported);
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snd_stm_printd(1, "%sabling DAC %s's.\n", enabled ? "En" : "Dis",
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dev_name(&conv_i2c->client->dev));
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spin_lock(&conv_i2c->work_lock);
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conv_i2c->work_enable_value = enabled;
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schedule_work(&conv_i2c->work);
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spin_unlock(&conv_i2c->work_lock);
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return 0;
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}
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static int snd_stm_conv_i2c_set_muted(int muted, void *priv)
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{
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struct snd_stm_conv_i2c *conv_i2c = priv;
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snd_stm_printd(1, "snd_stm_conv_i2c_set_muted(muted=%d, priv=%p)\n",
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muted, priv);
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BUG_ON(!conv_i2c);
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BUG_ON(!snd_stm_magic_valid(conv_i2c));
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BUG_ON(!conv_i2c->info->mute_supported);
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snd_stm_printd(1, "%suting DAC %s.\n", muted ? "M" : "Unm",
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dev_name(&conv_i2c->client->dev));
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spin_lock(&conv_i2c->work_lock);
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conv_i2c->work_mute_value = muted;
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schedule_work(&conv_i2c->work);
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spin_unlock(&conv_i2c->work_lock);
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return 0;
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}
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/*
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* I2C driver routines
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*/
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static int snd_stm_conv_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int result = 0;
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struct snd_stm_conv_i2c *conv_i2c;
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snd_stm_printd(0, "%s('%s')\n", __func__, dev_name(&client->dev));
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BUG_ON(!client->dev.platform_data);
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conv_i2c = kzalloc(sizeof(*conv_i2c), GFP_KERNEL);
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if (!conv_i2c) {
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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_i2c);
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conv_i2c->client = client;
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conv_i2c->info = client->dev.platform_data;
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conv_i2c->ops.get_format = snd_stm_conv_i2c_get_format;
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conv_i2c->ops.get_oversampling = snd_stm_conv_i2c_get_oversampling;
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if (conv_i2c->info->enable_supported)
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conv_i2c->ops.set_enabled = snd_stm_conv_i2c_set_enabled;
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if (conv_i2c->info->mute_supported)
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conv_i2c->ops.set_muted = snd_stm_conv_i2c_set_muted;
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/* Call the user-provided init function */
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if (conv_i2c->info->init) {
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result = conv_i2c->info->init(client, conv_i2c->info->priv);
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if (result != 0) {
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snd_stm_printe("User's init function failed for I2C "
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"converter %s! (%d)\n",
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dev_name(&conv_i2c->client->dev),
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result);
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goto error_init;
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}
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}
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/* Get connections */
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BUG_ON(!conv_i2c->info->source_bus_id);
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snd_stm_printd(0, "This converter is attached to '%s'.\n",
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conv_i2c->info->source_bus_id);
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conv_i2c->converter = snd_stm_conv_register_converter(
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conv_i2c->info->group, &conv_i2c->ops, conv_i2c,
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&platform_bus_type, conv_i2c->info->source_bus_id,
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conv_i2c->info->channel_from,
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conv_i2c->info->channel_to, NULL);
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if (!conv_i2c->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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/* Initialize the converter */
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INIT_WORK(&conv_i2c->work, snd_stm_conv_i2c_work);
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spin_lock_init(&conv_i2c->work_lock);
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conv_i2c->work_enable_value = -1;
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conv_i2c->work_mute_value = -1;
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if (conv_i2c->info->enable_supported) {
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result = i2c_master_send(client, conv_i2c->info->disable_cmd,
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conv_i2c->info->disable_cmd_len);
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if (result != conv_i2c->info->disable_cmd_len) {
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snd_stm_printe("Failed to disable I2C converter '%s'!"
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" (%d)\n",
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dev_name(&conv_i2c->client->dev),
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result);
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goto error_set_enabled;
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}
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}
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if (conv_i2c->info->mute_supported) {
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result = i2c_master_send(client, conv_i2c->info->mute_cmd,
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conv_i2c->info->mute_cmd_len);
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if (result != conv_i2c->info->mute_cmd_len) {
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snd_stm_printe("Failed to mute I2C converter '%s'!"
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" (%d)\n",
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dev_name(&conv_i2c->client->dev),
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result);
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goto error_set_muted;
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}
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}
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/* Done now */
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i2c_set_clientdata(client, conv_i2c);
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return 0;
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error_set_muted:
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error_set_enabled:
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snd_stm_conv_unregister_converter(conv_i2c->converter);
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error_attach:
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error_init:
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snd_stm_magic_clear(conv_i2c);
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kfree(conv_i2c);
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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_i2c_remove(struct i2c_client *client)
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{
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struct snd_stm_conv_i2c *conv_i2c = i2c_get_clientdata(client);
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BUG_ON(!conv_i2c);
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BUG_ON(!snd_stm_magic_valid(conv_i2c));
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snd_stm_conv_unregister_converter(conv_i2c->converter);
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/* Wait for the possibly scheduled work... */
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flush_scheduled_work();
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/* Muting and disabling - just to be sure ;-) */
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if (conv_i2c->info->mute_supported)
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i2c_master_send(client, conv_i2c->info->mute_cmd,
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conv_i2c->info->mute_cmd_len);
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if (conv_i2c->info->enable_supported)
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i2c_master_send(client, conv_i2c->info->disable_cmd,
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conv_i2c->info->disable_cmd_len);
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snd_stm_magic_clear(conv_i2c);
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kfree(conv_i2c);
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return 0;
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}
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static struct i2c_driver snd_stm_conv_i2c_driver = {
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.driver.name = "snd_conv_i2c",
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.probe = snd_stm_conv_i2c_probe,
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.remove = snd_stm_conv_i2c_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_i2c_init(void)
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{
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return i2c_add_driver(&snd_stm_conv_i2c_driver);
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}
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static void __exit snd_stm_conv_i2c_exit(void)
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{
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i2c_del_driver(&snd_stm_conv_i2c_driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Pawel Moll <pawel.moll@st.com>");
|
||
|
|
MODULE_DESCRIPTION("STMicroelectronics I2C-controlled audio converter driver");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
|
||
|
|
module_init(snd_stm_conv_i2c_init);
|
||
|
|
module_exit(snd_stm_conv_i2c_exit);
|