ASoC: Machine driver for for s3c24xx with uda134x

Signed-off-by: Christian Pellegrin <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

include/sound/s3c24xx_uda134x.h

···
+#ifndef _S3C24XX_UDA134X_H_
+#define _S3C24XX_UDA134X_H_ 1
+
+#include <sound/uda134x.h>
+
+struct s3c24xx_uda134x_platform_data {
+	int l3_clk;
+	int l3_mode;
+	int l3_data;
+	void (*power) (int);
+	int model;
+};
+
+#endif

sound/soc/s3c24xx/Kconfig

···
 	  Say Y if you want to add support for SoC audio on ln2440sbc
 	  with the ALC650.
 
+config SND_S3C24XX_SOC_S3C24XX_UDA134X
+	tristate "SoC I2S Audio support UDA134X wired to a S3C24XX"
+       	depends on SND_S3C24XX_SOC
+       	select SND_S3C24XX_SOC_I2S
+       	select SND_SOC_UDA134X

sound/soc/s3c24xx/Makefile

···
 snd-soc-neo1973-wm8753-objs := neo1973_wm8753.o
 snd-soc-smdk2443-wm9710-objs := smdk2443_wm9710.o
 snd-soc-ln2440sbc-alc650-objs := ln2440sbc_alc650.o
+snd-soc-s3c24xx-uda134x-objs := s3c24xx_uda134x.o
 
 obj-$(CONFIG_SND_S3C24XX_SOC_NEO1973_WM8753) += snd-soc-neo1973-wm8753.o
 obj-$(CONFIG_SND_S3C24XX_SOC_SMDK2443_WM9710) += snd-soc-smdk2443-wm9710.o
 obj-$(CONFIG_SND_S3C24XX_SOC_LN2440SBC_ALC650) += snd-soc-ln2440sbc-alc650.o
+obj-$(CONFIG_SND_S3C24XX_SOC_S3C24XX_UDA134X) += snd-soc-s3c24xx-uda134x.o

sound/soc/s3c24xx/s3c24xx_uda134x.c

···
+/*
+ * Modifications by Christian Pellegrin <[e-mail]>
+ *
+ * s3c24xx_uda134x.c  --  S3C24XX_UDA134X ALSA SoC Audio board driver
+ *
+ * Copyright 2007 Dension Audio Systems Ltd.
+ * Author: Zoltan Devai
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/s3c24xx_uda134x.h>
+#include <sound/uda134x.h>
+
+#include <asm/plat-s3c24xx/regs-iis.h>
+
+#include "s3c24xx-pcm.h"
+#include "s3c24xx-i2s.h"
+#include "../codecs/uda134x_codec.h"
+
+
+/* #define ENFORCE_RATES 1 */
+/*
+  Unfortunately the S3C24XX in master mode has a limited capacity of
+  generating the clock for the codec. If you define this only rates
+  that are really available will be enforced. But be careful, most
+  user level application just want the usual sampling frequencies (8,
+  11.025, 22.050, 44.1 kHz) and anyway resampling is a costly
+  operation for embedded systems. So if you aren't very lucky or your
+  hardware engineer wasn't very forward-looking it's better to leave
+  this undefined. If you do so an approximate value for the requested
+  sampling rate in the range -/+ 5% will be chosen. If this in not
+  possible an error will be returned.
+*/
+
+static struct clk *xtal;
+static struct clk *pclk;
+/* this is need because we don't have a place where to keep the
+ * pointers to the clocks in each substream. We get the clocks only
+ * when we are actually using them so we don't block stuff like
+ * frequency change or oscillator power-off */
+static int clk_users;
+static DEFINE_MUTEX(clk_lock);
+
+static unsigned int rates[33 * 2];
+#ifdef ENFORCE_RATES
+static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
+	.count	= ARRAY_SIZE(rates),
+	.list	= rates,
+	.mask	= 0,
+};
+#endif
+
+static struct platform_device *s3c24xx_uda134x_snd_device;
+
+int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream)
+{
+	int ret = 0;
+#ifdef ENFORCE_RATES
+	struct snd_pcm_runtime *runtime = substream->runtime;;
+#endif
+
+	mutex_lock(&clk_lock);
+	pr_debug("%s %d\n", __func__, clk_users);
+	if (clk_users == 0) {
+		xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal");
+		if (!xtal) {
+			printk(KERN_ERR "%s cannot get xtal\n", __func__);
+			ret = -EBUSY;
+		} else {
+			pclk = clk_get(&s3c24xx_uda134x_snd_device->dev,
+				       "pclk");
+			if (!pclk) {
+				printk(KERN_ERR "%s cannot get pclk\n",
+				       __func__);
+				clk_put(xtal);
+				ret = -EBUSY;
+			}
+		}
+		if (!ret) {
+			int i, j;
+
+			for (i = 0; i < 2; i++) {
+				int fs = i ? 256 : 384;
+
+				rates[i*33] = clk_get_rate(xtal) / fs;
+				for (j = 1; j < 33; j++)
+					rates[i*33 + j] = clk_get_rate(pclk) /
+						(j * fs);
+			}
+		}
+	}
+	clk_users += 1;
+	mutex_unlock(&clk_lock);
+	if (!ret) {
+#ifdef ENFORCE_RATES
+		ret = snd_pcm_hw_constraint_list(runtime, 0,
+						 SNDRV_PCM_HW_PARAM_RATE,
+						 &hw_constraints_rates);
+		if (ret < 0)
+			printk(KERN_ERR "%s cannot set constraints\n",
+			       __func__);
+#endif
+	}
+	return ret;
+}
+
+void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream)
+{
+	mutex_lock(&clk_lock);
+	pr_debug("%s %d\n", __func__, clk_users);
+	clk_users -= 1;
+	if (clk_users == 0) {
+		clk_put(xtal);
+		xtal = NULL;
+		clk_put(pclk);
+		pclk = NULL;
+	}
+	mutex_unlock(&clk_lock);
+}
+
+static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream,
+					struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
+	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+	unsigned int clk = 0;
+	int ret = 0;
+	int clk_source, fs_mode;
+	unsigned long rate = params_rate(params);
+	long err, cerr;
+	unsigned int div;
+	int i, bi;
+
+	err = 999999;
+	bi = 0;
+	for (i = 0; i < 2*33; i++) {
+		cerr = rates[i] - rate;
+		if (cerr < 0)
+			cerr = -cerr;
+		if (cerr < err) {
+			err = cerr;
+			bi = i;
+		}
+	}
+	if (bi / 33 == 1)
+		fs_mode = S3C2410_IISMOD_256FS;
+	else
+		fs_mode = S3C2410_IISMOD_384FS;
+	if (bi % 33 == 0) {
+		clk_source = S3C24XX_CLKSRC_MPLL;
+		div = 1;
+	} else {
+		clk_source = S3C24XX_CLKSRC_PCLK;
+		div = bi % 33;
+	}
+	pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi);
+
+	clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate;
+	pr_debug("%s will use: %s %s %d sysclk %d err %ld\n", __func__,
+		 fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS",
+		 clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK",
+		 div, clk, err);
+
+	if ((err * 100 / rate) > 5) {
+		printk(KERN_ERR "S3C24XX_UDA134X: effective frequency "
+		       "too different from desired (%ld%%)\n",
+		       err * 100 / rate);
+		return -EINVAL;
+	}
+
+	ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
+			SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+	if (ret < 0)
+		return ret;
+
+	ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
+			SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+	if (ret < 0)
+		return ret;
+
+	ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, clk_source , clk,
+						SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		return ret;
+
+	ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
+						fs_mode);
+	if (ret < 0)
+		return ret;
+
+	ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
+						S3C2410_IISMOD_32FS);
+	if (ret < 0)
+		return ret;
+
+	ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
+					  S3C24XX_PRESCALE(div, div));
+	if (ret < 0)
+		return ret;
+
+	/* set the codec system clock for DAC and ADC */
+	ret = codec_dai->dai_ops.set_sysclk(codec_dai, 0, clk,
+						SND_SOC_CLOCK_OUT);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct snd_soc_ops s3c24xx_uda134x_ops = {
+	.startup = s3c24xx_uda134x_startup,
+	.shutdown = s3c24xx_uda134x_shutdown,
+	.hw_params = s3c24xx_uda134x_hw_params,
+};
+
+static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = {
+	.name = "UDA134X",
+	.stream_name = "UDA134X",
+	.codec_dai = &uda134x_dai,
+	.cpu_dai = &s3c24xx_i2s_dai,
+	.ops = &s3c24xx_uda134x_ops,
+};
+
+static struct snd_soc_machine snd_soc_machine_s3c24xx_uda134x = {
+	.name = "S3C24XX_UDA134X",
+	.dai_link = &s3c24xx_uda134x_dai_link,
+	.num_links = 1,
+};
+
+static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins;
+
+static void setdat(int v)
+{
+	gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0);
+}
+
+static void setclk(int v)
+{
+	gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0);
+}
+
+static void setmode(int v)
+{
+	gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0);
+}
+
+static struct uda134x_platform_data s3c24xx_uda134x = {
+	.l3 = {
+		.setdat = setdat,
+		.setclk = setclk,
+		.setmode = setmode,
+		.data_hold = 1,
+		.data_setup = 1,
+		.clock_high = 1,
+		.mode_hold = 1,
+		.mode = 1,
+		.mode_setup = 1,
+	},
+};
+
+static struct snd_soc_device s3c24xx_uda134x_snd_devdata = {
+	.machine = &snd_soc_machine_s3c24xx_uda134x,
+	.platform = &s3c24xx_soc_platform,
+	.codec_dev = &soc_codec_dev_uda134x,
+	.codec_data = &s3c24xx_uda134x,
+};
+
+static int s3c24xx_uda134x_setup_pin(int pin, char *fun)
+{
+	if (gpio_request(pin, "s3c24xx_uda134x") < 0) {
+		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
+		       "l3 %s pin already in use", fun);
+		return -EBUSY;
+	}
+	gpio_direction_output(pin, 0);
+	return 0;
+}
+
+static int s3c24xx_uda134x_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n");
+
+	s3c24xx_uda134x_l3_pins = pdev->dev.platform_data;
+	if (s3c24xx_uda134x_l3_pins == NULL) {
+		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
+		       "unable to find platform data\n");
+		return -ENODEV;
+	}
+	s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power;
+	s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model;
+
+	if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data,
+				      "data") < 0)
+		return -EBUSY;
+	if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk,
+				      "clk") < 0) {
+		gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
+		return -EBUSY;
+	}
+	if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode,
+				      "mode") < 0) {
+		gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
+		gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
+		return -EBUSY;
+	}
+
+	s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1);
+	if (!s3c24xx_uda134x_snd_device) {
+		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
+		       "Unable to register\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(s3c24xx_uda134x_snd_device,
+			     &s3c24xx_uda134x_snd_devdata);
+	s3c24xx_uda134x_snd_devdata.dev = &s3c24xx_uda134x_snd_device->dev;
+	ret = platform_device_add(s3c24xx_uda134x_snd_device);
+	if (ret) {
+		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n");
+		platform_device_put(s3c24xx_uda134x_snd_device);
+	}
+
+	return ret;
+}
+
+static int s3c24xx_uda134x_remove(struct platform_device *pdev)
+{
+	platform_device_unregister(s3c24xx_uda134x_snd_device);
+	gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
+	gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
+	gpio_free(s3c24xx_uda134x_l3_pins->l3_mode);
+	return 0;
+}
+
+static struct platform_driver s3c24xx_uda134x_driver = {
+	.probe  = s3c24xx_uda134x_probe,
+	.remove = s3c24xx_uda134x_remove,
+	.driver = {
+		.name = "s3c24xx_uda134x",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init s3c24xx_uda134x_init(void)
+{
+	return platform_driver_register(&s3c24xx_uda134x_driver);
+}
+
+static void __exit s3c24xx_uda134x_exit(void)
+{
+	platform_driver_unregister(&s3c24xx_uda134x_driver);
+}
+
+
+module_init(s3c24xx_uda134x_init);
+module_exit(s3c24xx_uda134x_exit);
+
+MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <[e-mail]>");
+MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
+MODULE_LICENSE("GPL");