373 lines
8.7 KiB
C
373 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright 2009 Simtec Electronics
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#include <linux/gpio.h>
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <sound/soc.h>
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#include <linux/platform_data/asoc-s3c24xx_simtec.h>
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#include "s3c24xx-i2s.h"
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#include "s3c24xx_simtec.h"
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static struct s3c24xx_audio_simtec_pdata *pdata;
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static struct clk *xtal_clk;
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static int spk_gain;
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static int spk_unmute;
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/**
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* speaker_gain_get - read the speaker gain setting.
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* @kcontrol: The control for the speaker gain.
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* @ucontrol: The value that needs to be updated.
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*
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* Read the value for the AMP gain control.
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*/
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static int speaker_gain_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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ucontrol->value.integer.value[0] = spk_gain;
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return 0;
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}
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/**
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* speaker_gain_set - set the value of the speaker amp gain
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* @value: The value to write.
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*/
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static void speaker_gain_set(int value)
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{
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gpio_set_value_cansleep(pdata->amp_gain[0], value & 1);
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gpio_set_value_cansleep(pdata->amp_gain[1], value >> 1);
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}
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/**
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* speaker_gain_put - set the speaker gain setting.
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* @kcontrol: The control for the speaker gain.
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* @ucontrol: The value that needs to be set.
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*
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* Set the value of the speaker gain from the specified
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* @ucontrol setting.
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*
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* Note, if the speaker amp is muted, then we do not set a gain value
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* as at-least one of the ICs that is fitted will try and power up even
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* if the main control is set to off.
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*/
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static int speaker_gain_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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int value = ucontrol->value.integer.value[0];
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spk_gain = value;
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if (!spk_unmute)
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speaker_gain_set(value);
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return 0;
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}
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static const struct snd_kcontrol_new amp_gain_controls[] = {
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SOC_SINGLE_EXT("Speaker Gain", 0, 0, 3, 0,
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speaker_gain_get, speaker_gain_put),
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};
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/**
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* spk_unmute_state - set the unmute state of the speaker
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* @to: zero to unmute, non-zero to ununmute.
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*/
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static void spk_unmute_state(int to)
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{
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pr_debug("%s: to=%d\n", __func__, to);
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spk_unmute = to;
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gpio_set_value(pdata->amp_gpio, to);
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/* if we're umuting, also re-set the gain */
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if (to && pdata->amp_gain[0] > 0)
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speaker_gain_set(spk_gain);
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}
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/**
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* speaker_unmute_get - read the speaker unmute setting.
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* @kcontrol: The control for the speaker gain.
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* @ucontrol: The value that needs to be updated.
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*
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* Read the value for the AMP gain control.
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*/
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static int speaker_unmute_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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ucontrol->value.integer.value[0] = spk_unmute;
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return 0;
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}
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/**
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* speaker_unmute_put - set the speaker unmute setting.
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* @kcontrol: The control for the speaker gain.
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* @ucontrol: The value that needs to be set.
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*
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* Set the value of the speaker gain from the specified
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* @ucontrol setting.
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*/
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static int speaker_unmute_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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spk_unmute_state(ucontrol->value.integer.value[0]);
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return 0;
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}
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/* This is added as a manual control as the speaker amps create clicks
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* when their power state is changed, which are far more noticeable than
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* anything produced by the CODEC itself.
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*/
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static const struct snd_kcontrol_new amp_unmute_controls[] = {
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SOC_SINGLE_EXT("Speaker Switch", 0, 0, 1, 0,
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speaker_unmute_get, speaker_unmute_put),
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};
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void simtec_audio_init(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_soc_card *card = rtd->card;
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if (pdata->amp_gpio > 0) {
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pr_debug("%s: adding amp routes\n", __func__);
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snd_soc_add_card_controls(card, amp_unmute_controls,
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ARRAY_SIZE(amp_unmute_controls));
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}
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if (pdata->amp_gain[0] > 0) {
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pr_debug("%s: adding amp controls\n", __func__);
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snd_soc_add_card_controls(card, amp_gain_controls,
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ARRAY_SIZE(amp_gain_controls));
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}
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}
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EXPORT_SYMBOL_GPL(simtec_audio_init);
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#define CODEC_CLOCK 12000000
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/**
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* simtec_hw_params - update hardware parameters
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* @substream: The audio substream instance.
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* @params: The parameters requested.
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*
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* Update the codec data routing and configuration settings
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* from the supplied data.
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*/
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static int simtec_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
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struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
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int ret;
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ret = snd_soc_dai_set_sysclk(codec_dai, 0,
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CODEC_CLOCK, SND_SOC_CLOCK_IN);
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if (ret) {
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pr_err( "%s: failed setting codec sysclk\n", __func__);
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return ret;
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}
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if (pdata->use_mpllin) {
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ret = snd_soc_dai_set_sysclk(cpu_dai, S3C24XX_CLKSRC_MPLL,
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0, SND_SOC_CLOCK_OUT);
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if (ret) {
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pr_err("%s: failed to set MPLLin as clksrc\n",
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__func__);
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return ret;
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}
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}
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if (pdata->output_cdclk) {
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int cdclk_scale;
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cdclk_scale = clk_get_rate(xtal_clk) / CODEC_CLOCK;
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cdclk_scale--;
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ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
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cdclk_scale);
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if (ret) {
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pr_err("%s: failed to set clock div\n",
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__func__);
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return ret;
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}
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}
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return 0;
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}
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static int simtec_call_startup(struct s3c24xx_audio_simtec_pdata *pd)
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{
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/* call any board supplied startup code, this currently only
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* covers the bast/vr1000 which have a CPLD in the way of the
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* LRCLK */
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if (pd->startup)
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pd->startup();
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return 0;
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}
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static const struct snd_soc_ops simtec_snd_ops = {
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.hw_params = simtec_hw_params,
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};
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/**
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* attach_gpio_amp - get and configure the necessary gpios
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* @dev: The device we're probing.
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* @pd: The platform data supplied by the board.
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*
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* If there is a GPIO based amplifier attached to the board, claim
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* the necessary GPIO lines for it, and set default values.
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*/
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static int attach_gpio_amp(struct device *dev,
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struct s3c24xx_audio_simtec_pdata *pd)
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{
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int ret;
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/* attach gpio amp gain (if any) */
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if (pdata->amp_gain[0] > 0) {
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ret = gpio_request(pd->amp_gain[0], "gpio-amp-gain0");
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if (ret) {
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dev_err(dev, "cannot get amp gpio gain0\n");
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return ret;
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}
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ret = gpio_request(pd->amp_gain[1], "gpio-amp-gain1");
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if (ret) {
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dev_err(dev, "cannot get amp gpio gain1\n");
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gpio_free(pdata->amp_gain[0]);
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return ret;
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}
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gpio_direction_output(pd->amp_gain[0], 0);
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gpio_direction_output(pd->amp_gain[1], 0);
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}
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/* note, currently we assume GPA0 isn't valid amp */
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if (pdata->amp_gpio > 0) {
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ret = gpio_request(pd->amp_gpio, "gpio-amp");
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if (ret) {
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dev_err(dev, "cannot get amp gpio %d (%d)\n",
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pd->amp_gpio, ret);
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goto err_amp;
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}
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/* set the amp off at startup */
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spk_unmute_state(0);
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}
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return 0;
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err_amp:
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if (pd->amp_gain[0] > 0) {
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gpio_free(pd->amp_gain[0]);
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gpio_free(pd->amp_gain[1]);
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}
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return ret;
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}
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static void detach_gpio_amp(struct s3c24xx_audio_simtec_pdata *pd)
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{
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if (pd->amp_gain[0] > 0) {
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gpio_free(pd->amp_gain[0]);
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gpio_free(pd->amp_gain[1]);
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}
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if (pd->amp_gpio > 0)
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gpio_free(pd->amp_gpio);
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}
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#ifdef CONFIG_PM
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static int simtec_audio_resume(struct device *dev)
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{
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simtec_call_startup(pdata);
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return 0;
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}
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const struct dev_pm_ops simtec_audio_pmops = {
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.resume = simtec_audio_resume,
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};
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EXPORT_SYMBOL_GPL(simtec_audio_pmops);
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#endif
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int simtec_audio_core_probe(struct platform_device *pdev,
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struct snd_soc_card *card)
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{
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struct platform_device *snd_dev;
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int ret;
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card->dai_link->ops = &simtec_snd_ops;
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card->dai_link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBM_CFM;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data supplied\n");
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return -EINVAL;
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}
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simtec_call_startup(pdata);
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xtal_clk = clk_get(&pdev->dev, "xtal");
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if (IS_ERR(xtal_clk)) {
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dev_err(&pdev->dev, "could not get clkout0\n");
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return -EINVAL;
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}
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dev_info(&pdev->dev, "xtal rate is %ld\n", clk_get_rate(xtal_clk));
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ret = attach_gpio_amp(&pdev->dev, pdata);
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if (ret)
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goto err_clk;
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snd_dev = platform_device_alloc("soc-audio", -1);
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if (!snd_dev) {
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dev_err(&pdev->dev, "failed to alloc soc-audio device\n");
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ret = -ENOMEM;
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goto err_gpio;
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}
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platform_set_drvdata(snd_dev, card);
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ret = platform_device_add(snd_dev);
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if (ret) {
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dev_err(&pdev->dev, "failed to add soc-audio dev\n");
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goto err_pdev;
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}
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platform_set_drvdata(pdev, snd_dev);
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return 0;
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err_pdev:
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platform_device_put(snd_dev);
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err_gpio:
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detach_gpio_amp(pdata);
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err_clk:
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clk_put(xtal_clk);
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return ret;
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}
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EXPORT_SYMBOL_GPL(simtec_audio_core_probe);
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int simtec_audio_remove(struct platform_device *pdev)
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{
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struct platform_device *snd_dev = platform_get_drvdata(pdev);
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platform_device_unregister(snd_dev);
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detach_gpio_amp(pdata);
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clk_put(xtal_clk);
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return 0;
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}
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EXPORT_SYMBOL_GPL(simtec_audio_remove);
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_DESCRIPTION("ALSA SoC Simtec Audio common support");
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MODULE_LICENSE("GPL");
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