319 lines
7.7 KiB
C
319 lines
7.7 KiB
C
/*
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* STMicroelectronics System-on-Chips' EPLD-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 <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_epld {
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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_epld_info *info;
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struct snd_stm_conv_ops ops;
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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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* EPLD access implementation
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*/
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/* Defined in arch/sh/boards/st/common/epld.c */
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void epld_write(unsigned long value, unsigned long offset);
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unsigned long epld_read(unsigned long offset);
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static void snd_stm_conv_epld_set(unsigned long offset,
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unsigned long mask, unsigned long value)
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{
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unsigned long reg = epld_read(offset);
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reg &= ~mask;
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reg |= value;
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epld_write(reg, offset);
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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_epld_get_format(void *priv)
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{
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struct snd_stm_conv_epld *conv_epld = priv;
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snd_stm_printd(1, "snd_stm_conv_epld_get_format(priv=%p)\n", priv);
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BUG_ON(!conv_epld);
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BUG_ON(!snd_stm_magic_valid(conv_epld));
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return conv_epld->info->format;
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}
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static int snd_stm_conv_epld_get_oversampling(void *priv)
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{
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struct snd_stm_conv_epld *conv_epld = priv;
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snd_stm_printd(1, "snd_stm_conv_epld_get_oversampling(priv=%p)\n",
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priv);
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BUG_ON(!conv_epld);
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BUG_ON(!snd_stm_magic_valid(conv_epld));
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return conv_epld->info->oversampling;
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}
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static int snd_stm_conv_epld_set_enabled(int enabled, void *priv)
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{
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struct snd_stm_conv_epld *conv_epld = priv;
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snd_stm_printd(1, "snd_stm_conv_epld_enable(enabled=%d, priv=%p)\n",
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enabled, priv);
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BUG_ON(!conv_epld);
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BUG_ON(!snd_stm_magic_valid(conv_epld));
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BUG_ON(!conv_epld->info->enable_supported);
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snd_stm_printd(1, "%sabling DAC %s's.\n", enabled ? "En" : "Dis",
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conv_epld->dev_name);
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snd_stm_conv_epld_set(conv_epld->info->enable_offset,
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conv_epld->info->enable_mask,
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enabled ? conv_epld->info->enable_value :
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conv_epld->info->disable_value);
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return 0;
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}
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static int snd_stm_conv_epld_set_muted(int muted, void *priv)
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{
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struct snd_stm_conv_epld *conv_epld = priv;
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snd_stm_printd(1, "snd_stm_conv_epld_set_muted(muted=%d, priv=%p)\n",
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muted, priv);
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BUG_ON(!conv_epld);
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BUG_ON(!snd_stm_magic_valid(conv_epld));
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BUG_ON(!conv_epld->info->mute_supported);
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snd_stm_printd(1, "%suting DAC %s.\n", muted ? "M" : "Unm",
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conv_epld->dev_name);
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snd_stm_conv_epld_set(conv_epld->info->mute_offset,
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conv_epld->info->mute_mask,
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muted ? conv_epld->info->mute_value :
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conv_epld->info->unmute_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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#define DUMP_EPLD(offset) snd_iprintf(buffer, "EPLD[0x%08x] = 0x%08lx\n", \
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offset, epld_read(offset));
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static void snd_stm_conv_epld_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_epld *conv_epld = entry->private_data;
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BUG_ON(!conv_epld);
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BUG_ON(!snd_stm_magic_valid(conv_epld));
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snd_iprintf(buffer, "--- %s ---\n", conv_epld->dev_name);
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if (conv_epld->info->enable_supported)
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DUMP_EPLD(conv_epld->info->enable_offset);
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if (conv_epld->info->mute_supported)
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DUMP_EPLD(conv_epld->info->mute_offset);
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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_epld_probe(struct platform_device *pdev)
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{
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int result = 0;
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struct snd_stm_conv_epld *conv_epld;
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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_epld = kzalloc(sizeof(*conv_epld), GFP_KERNEL);
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if (!conv_epld) {
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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_epld);
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conv_epld->dev_name = dev_name(&pdev->dev);
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conv_epld->info = pdev->dev.platform_data;
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conv_epld->ops.get_format = snd_stm_conv_epld_get_format;
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conv_epld->ops.get_oversampling = snd_stm_conv_epld_get_oversampling;
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if (conv_epld->info->enable_supported)
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conv_epld->ops.set_enabled = snd_stm_conv_epld_set_enabled;
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if (conv_epld->info->mute_supported)
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conv_epld->ops.set_muted = snd_stm_conv_epld_set_muted;
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/* Get connections */
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BUG_ON(!conv_epld->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_epld->info->source_bus_id);
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conv_epld->converter = snd_stm_conv_register_converter(
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conv_epld->info->group, &conv_epld->ops, conv_epld,
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&platform_bus_type, conv_epld->info->source_bus_id,
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conv_epld->info->channel_from,
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conv_epld->info->channel_to, NULL);
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if (!conv_epld->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 converter as muted & disabled */
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if (conv_epld->info->enable_supported)
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snd_stm_conv_epld_set(conv_epld->info->enable_offset,
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conv_epld->info->enable_mask,
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conv_epld->info->disable_value);
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if (conv_epld->info->mute_supported)
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snd_stm_conv_epld_set(conv_epld->info->mute_offset,
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conv_epld->info->mute_mask,
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conv_epld->info->mute_value);
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/* Additional procfs info */
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snd_stm_info_register(&conv_epld->proc_entry,
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conv_epld->dev_name,
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snd_stm_conv_epld_read_info,
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conv_epld);
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/* Done now */
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platform_set_drvdata(pdev, conv_epld);
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return 0;
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error_attach:
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snd_stm_magic_clear(conv_epld);
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kfree(conv_epld);
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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_epld_remove(struct platform_device *pdev)
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{
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struct snd_stm_conv_epld *conv_epld = platform_get_drvdata(pdev);
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BUG_ON(!conv_epld);
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BUG_ON(!snd_stm_magic_valid(conv_epld));
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snd_stm_conv_unregister_converter(conv_epld->converter);
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/* Remove procfs entry */
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snd_stm_info_unregister(conv_epld->proc_entry);
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/* Muting and disabling - just to be sure ;-) */
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if (conv_epld->info->enable_supported)
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snd_stm_conv_epld_set(conv_epld->info->enable_offset,
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conv_epld->info->enable_mask,
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conv_epld->info->disable_value);
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if (conv_epld->info->mute_supported)
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snd_stm_conv_epld_set(conv_epld->info->mute_offset,
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conv_epld->info->mute_mask,
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conv_epld->info->mute_value);
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snd_stm_magic_clear(conv_epld);
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kfree(conv_epld);
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return 0;
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}
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static struct platform_driver snd_stm_conv_epld_driver = {
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.driver.name = "snd_conv_epld",
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.probe = snd_stm_conv_epld_probe,
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.remove = snd_stm_conv_epld_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_epld_init(void)
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{
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return platform_driver_register(&snd_stm_conv_epld_driver);
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}
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static void __exit snd_stm_conv_epld_exit(void)
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{
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platform_driver_unregister(&snd_stm_conv_epld_driver);
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}
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MODULE_AUTHOR("Pawel Moll <pawel.moll@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics EPLD-controlled audio converter driver");
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MODULE_LICENSE("GPL");
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module_init(snd_stm_conv_epld_init);
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module_exit(snd_stm_conv_epld_exit);
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