ASoC: Machine driver for for s3c24xx with uda134x

Signed-off-by: Christian Pellegrin <chripell@fsfe.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

ASoC: Machine driver for for s3c24xx with uda134x
Signed-off-by: Christian Pellegrin <chripell@fsfe.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Christian Pellegrin · Mark Brown
1 parent 1cad1de1b2
Showing 4 changed files with 395 additions and 0 deletions Side-by-side Diff
include/sound/s3c24xx_uda134x.h
sound/soc/s3c24xx/Kconfig
sound/soc/s3c24xx/Makefile
sound/soc/s3c24xx/s3c24xx_uda134x.c
+#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
@@ -43,4 +43,10 @@
 	help
 	  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
@@ -13,8 +13,10 @@
 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
+/*
+ * Modifications by Christian Pellegrin <chripell@evolware.org>
+ *
+ * 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 <chripell@evolware.org>");
+MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
+MODULE_LICENSE("GPL");
	1	+#ifndef _S3C24XX_UDA134X_H_
	2	+#define _S3C24XX_UDA134X_H_ 1
	3	+
	4	+#include <sound/uda134x.h>
	5	+
	6	+struct s3c24xx_uda134x_platform_data {
	7	+ int l3_clk;
	8	+ int l3_mode;
	9	+ int l3_data;
	10	+ void (*power) (int);
	11	+ int model;
	12	+};
	13	+
	14	+#endif
...	...	@@ -43,4 +43,10 @@
43	43	help
44	44	Say Y if you want to add support for SoC audio on ln2440sbc
45	45	with the ALC650.
	46	+
	47	+config SND_S3C24XX_SOC_S3C24XX_UDA134X
	48	+ tristate "SoC I2S Audio support UDA134X wired to a S3C24XX"
	49	+ depends on SND_S3C24XX_SOC
	50	+ select SND_S3C24XX_SOC_I2S
	51	+ select SND_SOC_UDA134X
...	...	@@ -13,8 +13,10 @@
13	13	snd-soc-neo1973-wm8753-objs := neo1973_wm8753.o
14	14	snd-soc-smdk2443-wm9710-objs := smdk2443_wm9710.o
15	15	snd-soc-ln2440sbc-alc650-objs := ln2440sbc_alc650.o
	16	+snd-soc-s3c24xx-uda134x-objs := s3c24xx_uda134x.o
16	17
17	18	obj-$(CONFIG_SND_S3C24XX_SOC_NEO1973_WM8753) += snd-soc-neo1973-wm8753.o
18	19	obj-$(CONFIG_SND_S3C24XX_SOC_SMDK2443_WM9710) += snd-soc-smdk2443-wm9710.o
19	20	obj-$(CONFIG_SND_S3C24XX_SOC_LN2440SBC_ALC650) += snd-soc-ln2440sbc-alc650.o
	21	+obj-$(CONFIG_SND_S3C24XX_SOC_S3C24XX_UDA134X) += snd-soc-s3c24xx-uda134x.o
	1	+/*
	2	+ * Modifications by Christian Pellegrin <chripell@evolware.org>
	3	+ *
	4	+ * s3c24xx_uda134x.c -- S3C24XX_UDA134X ALSA SoC Audio board driver
	5	+ *
	6	+ * Copyright 2007 Dension Audio Systems Ltd.
	7	+ * Author: Zoltan Devai
	8	+ *
	9	+ * This program is free software; you can redistribute it and/or modify
	10	+ * it under the terms of the GNU General Public License version 2 as
	11	+ * published by the Free Software Foundation.
	12	+ */
	13	+
	14	+#include <linux/module.h>
	15	+#include <linux/clk.h>
	16	+#include <linux/mutex.h>
	17	+#include <linux/gpio.h>
	18	+#include <sound/pcm.h>
	19	+#include <sound/pcm_params.h>
	20	+#include <sound/soc.h>
	21	+#include <sound/soc-dapm.h>
	22	+#include <sound/s3c24xx_uda134x.h>
	23	+#include <sound/uda134x.h>
	24	+
	25	+#include <asm/plat-s3c24xx/regs-iis.h>
	26	+
	27	+#include "s3c24xx-pcm.h"
	28	+#include "s3c24xx-i2s.h"
	29	+#include "../codecs/uda134x_codec.h"
	30	+
	31	+
	32	+/* #define ENFORCE_RATES 1 */
	33	+/*
	34	+ Unfortunately the S3C24XX in master mode has a limited capacity of
	35	+ generating the clock for the codec. If you define this only rates
	36	+ that are really available will be enforced. But be careful, most
	37	+ user level application just want the usual sampling frequencies (8,
	38	+ 11.025, 22.050, 44.1 kHz) and anyway resampling is a costly
	39	+ operation for embedded systems. So if you aren't very lucky or your
	40	+ hardware engineer wasn't very forward-looking it's better to leave
	41	+ this undefined. If you do so an approximate value for the requested
	42	+ sampling rate in the range -/+ 5% will be chosen. If this in not
	43	+ possible an error will be returned.
	44	+*/
	45	+
	46	+static struct clk *xtal;
	47	+static struct clk *pclk;
	48	+/* this is need because we don't have a place where to keep the
	49	+ * pointers to the clocks in each substream. We get the clocks only
	50	+ * when we are actually using them so we don't block stuff like
	51	+ * frequency change or oscillator power-off */
	52	+static int clk_users;
	53	+static DEFINE_MUTEX(clk_lock);
	54	+
	55	+static unsigned int rates[33 * 2];
	56	+#ifdef ENFORCE_RATES
	57	+static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
	58	+ .count = ARRAY_SIZE(rates),
	59	+ .list = rates,
	60	+ .mask = 0,
	61	+};
	62	+#endif
	63	+
	64	+static struct platform_device *s3c24xx_uda134x_snd_device;
	65	+
	66	+int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream)
	67	+{
	68	+ int ret = 0;
	69	+#ifdef ENFORCE_RATES
	70	+ struct snd_pcm_runtime *runtime = substream->runtime;;
	71	+#endif
	72	+
	73	+ mutex_lock(&clk_lock);
	74	+ pr_debug("%s %d\n", __func__, clk_users);
	75	+ if (clk_users == 0) {
	76	+ xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal");
	77	+ if (!xtal) {
	78	+ printk(KERN_ERR "%s cannot get xtal\n", __func__);
	79	+ ret = -EBUSY;
	80	+ } else {
	81	+ pclk = clk_get(&s3c24xx_uda134x_snd_device->dev,
	82	+ "pclk");
	83	+ if (!pclk) {
	84	+ printk(KERN_ERR "%s cannot get pclk\n",
	85	+ __func__);
	86	+ clk_put(xtal);
	87	+ ret = -EBUSY;
	88	+ }
	89	+ }
	90	+ if (!ret) {
	91	+ int i, j;
	92	+
	93	+ for (i = 0; i < 2; i++) {
	94	+ int fs = i ? 256 : 384;
	95	+
	96	+ rates[i*33] = clk_get_rate(xtal) / fs;
	97	+ for (j = 1; j < 33; j++)
	98	+ rates[i*33 + j] = clk_get_rate(pclk) /
	99	+ (j * fs);
	100	+ }
	101	+ }
	102	+ }
	103	+ clk_users += 1;
	104	+ mutex_unlock(&clk_lock);
	105	+ if (!ret) {
	106	+#ifdef ENFORCE_RATES
	107	+ ret = snd_pcm_hw_constraint_list(runtime, 0,
	108	+ SNDRV_PCM_HW_PARAM_RATE,
	109	+ &hw_constraints_rates);
	110	+ if (ret < 0)
	111	+ printk(KERN_ERR "%s cannot set constraints\n",
	112	+ __func__);
	113	+#endif
	114	+ }
	115	+ return ret;
	116	+}
	117	+
	118	+void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream)
	119	+{
	120	+ mutex_lock(&clk_lock);
	121	+ pr_debug("%s %d\n", __func__, clk_users);
	122	+ clk_users -= 1;
	123	+ if (clk_users == 0) {
	124	+ clk_put(xtal);
	125	+ xtal = NULL;
	126	+ clk_put(pclk);
	127	+ pclk = NULL;
	128	+ }
	129	+ mutex_unlock(&clk_lock);
	130	+}
	131	+
	132	+static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream,
	133	+ struct snd_pcm_hw_params *params)
	134	+{
	135	+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
	136	+ struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
	137	+ struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	138	+ unsigned int clk = 0;
	139	+ int ret = 0;
	140	+ int clk_source, fs_mode;
	141	+ unsigned long rate = params_rate(params);
	142	+ long err, cerr;
	143	+ unsigned int div;
	144	+ int i, bi;
	145	+
	146	+ err = 999999;
	147	+ bi = 0;
	148	+ for (i = 0; i < 2*33; i++) {
	149	+ cerr = rates[i] - rate;
	150	+ if (cerr < 0)
	151	+ cerr = -cerr;
	152	+ if (cerr < err) {
	153	+ err = cerr;
	154	+ bi = i;
	155	+ }
	156	+ }
	157	+ if (bi / 33 == 1)
	158	+ fs_mode = S3C2410_IISMOD_256FS;
	159	+ else
	160	+ fs_mode = S3C2410_IISMOD_384FS;
	161	+ if (bi % 33 == 0) {
	162	+ clk_source = S3C24XX_CLKSRC_MPLL;
	163	+ div = 1;
	164	+ } else {
	165	+ clk_source = S3C24XX_CLKSRC_PCLK;
	166	+ div = bi % 33;
	167	+ }
	168	+ pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi);
	169	+
	170	+ clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate;
	171	+ pr_debug("%s will use: %s %s %d sysclk %d err %ld\n", __func__,
	172	+ fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS",
	173	+ clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK",
	174	+ div, clk, err);
	175	+
	176	+ if ((err * 100 / rate) > 5) {
	177	+ printk(KERN_ERR "S3C24XX_UDA134X: effective frequency "
	178	+ "too different from desired (%ld%%)\n",
	179	+ err * 100 / rate);
	180	+ return -EINVAL;
	181	+ }
	182	+
	183	+ ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S \|
	184	+ SND_SOC_DAIFMT_NB_NF \| SND_SOC_DAIFMT_CBS_CFS);
	185	+ if (ret < 0)
	186	+ return ret;
	187	+
	188	+ ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S \|
	189	+ SND_SOC_DAIFMT_NB_NF \| SND_SOC_DAIFMT_CBS_CFS);
	190	+ if (ret < 0)
	191	+ return ret;
	192	+
	193	+ ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, clk_source , clk,
	194	+ SND_SOC_CLOCK_IN);
	195	+ if (ret < 0)
	196	+ return ret;
	197	+
	198	+ ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
	199	+ fs_mode);
	200	+ if (ret < 0)
	201	+ return ret;
	202	+
	203	+ ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
	204	+ S3C2410_IISMOD_32FS);
	205	+ if (ret < 0)
	206	+ return ret;
	207	+
	208	+ ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
	209	+ S3C24XX_PRESCALE(div, div));
	210	+ if (ret < 0)
	211	+ return ret;
	212	+
	213	+ /* set the codec system clock for DAC and ADC */
	214	+ ret = codec_dai->dai_ops.set_sysclk(codec_dai, 0, clk,
	215	+ SND_SOC_CLOCK_OUT);
	216	+ if (ret < 0)
	217	+ return ret;
	218	+
	219	+ return 0;
	220	+}
	221	+
	222	+static struct snd_soc_ops s3c24xx_uda134x_ops = {
	223	+ .startup = s3c24xx_uda134x_startup,
	224	+ .shutdown = s3c24xx_uda134x_shutdown,
	225	+ .hw_params = s3c24xx_uda134x_hw_params,
	226	+};
	227	+
	228	+static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = {
	229	+ .name = "UDA134X",
	230	+ .stream_name = "UDA134X",
	231	+ .codec_dai = &uda134x_dai,
	232	+ .cpu_dai = &s3c24xx_i2s_dai,
	233	+ .ops = &s3c24xx_uda134x_ops,
	234	+};
	235	+
	236	+static struct snd_soc_machine snd_soc_machine_s3c24xx_uda134x = {
	237	+ .name = "S3C24XX_UDA134X",
	238	+ .dai_link = &s3c24xx_uda134x_dai_link,
	239	+ .num_links = 1,
	240	+};
	241	+
	242	+static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins;
	243	+
	244	+static void setdat(int v)
	245	+{
	246	+ gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0);
	247	+}
	248	+
	249	+static void setclk(int v)
	250	+{
	251	+ gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0);
	252	+}
	253	+
	254	+static void setmode(int v)
	255	+{
	256	+ gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0);
	257	+}
	258	+
	259	+static struct uda134x_platform_data s3c24xx_uda134x = {
	260	+ .l3 = {
	261	+ .setdat = setdat,
	262	+ .setclk = setclk,
	263	+ .setmode = setmode,
	264	+ .data_hold = 1,
	265	+ .data_setup = 1,
	266	+ .clock_high = 1,
	267	+ .mode_hold = 1,
	268	+ .mode = 1,
	269	+ .mode_setup = 1,
	270	+ },
	271	+};
	272	+
	273	+static struct snd_soc_device s3c24xx_uda134x_snd_devdata = {
	274	+ .machine = &snd_soc_machine_s3c24xx_uda134x,
	275	+ .platform = &s3c24xx_soc_platform,
	276	+ .codec_dev = &soc_codec_dev_uda134x,
	277	+ .codec_data = &s3c24xx_uda134x,
	278	+};
	279	+
	280	+static int s3c24xx_uda134x_setup_pin(int pin, char *fun)
	281	+{
	282	+ if (gpio_request(pin, "s3c24xx_uda134x") < 0) {
	283	+ printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
	284	+ "l3 %s pin already in use", fun);
	285	+ return -EBUSY;
	286	+ }
	287	+ gpio_direction_output(pin, 0);
	288	+ return 0;
	289	+}
	290	+
	291	+static int s3c24xx_uda134x_probe(struct platform_device *pdev)
	292	+{
	293	+ int ret;
	294	+
	295	+ printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n");
	296	+
	297	+ s3c24xx_uda134x_l3_pins = pdev->dev.platform_data;
	298	+ if (s3c24xx_uda134x_l3_pins == NULL) {
	299	+ printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
	300	+ "unable to find platform data\n");
	301	+ return -ENODEV;
	302	+ }
	303	+ s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power;
	304	+ s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model;
	305	+
	306	+ if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data,
	307	+ "data") < 0)
	308	+ return -EBUSY;
	309	+ if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk,
	310	+ "clk") < 0) {
	311	+ gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
	312	+ return -EBUSY;
	313	+ }
	314	+ if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode,
	315	+ "mode") < 0) {
	316	+ gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
	317	+ gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
	318	+ return -EBUSY;
	319	+ }
	320	+
	321	+ s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1);
	322	+ if (!s3c24xx_uda134x_snd_device) {
	323	+ printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
	324	+ "Unable to register\n");
	325	+ return -ENOMEM;
	326	+ }
	327	+
	328	+ platform_set_drvdata(s3c24xx_uda134x_snd_device,
	329	+ &s3c24xx_uda134x_snd_devdata);
	330	+ s3c24xx_uda134x_snd_devdata.dev = &s3c24xx_uda134x_snd_device->dev;
	331	+ ret = platform_device_add(s3c24xx_uda134x_snd_device);
	332	+ if (ret) {
	333	+ printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n");
	334	+ platform_device_put(s3c24xx_uda134x_snd_device);
	335	+ }
	336	+
	337	+ return ret;
	338	+}
	339	+
	340	+static int s3c24xx_uda134x_remove(struct platform_device *pdev)
	341	+{
	342	+ platform_device_unregister(s3c24xx_uda134x_snd_device);
	343	+ gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
	344	+ gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
	345	+ gpio_free(s3c24xx_uda134x_l3_pins->l3_mode);
	346	+ return 0;
	347	+}
	348	+
	349	+static struct platform_driver s3c24xx_uda134x_driver = {
	350	+ .probe = s3c24xx_uda134x_probe,
	351	+ .remove = s3c24xx_uda134x_remove,
	352	+ .driver = {
	353	+ .name = "s3c24xx_uda134x",
	354	+ .owner = THIS_MODULE,
	355	+ },
	356	+};
	357	+
	358	+static int __init s3c24xx_uda134x_init(void)
	359	+{
	360	+ return platform_driver_register(&s3c24xx_uda134x_driver);
	361	+}
	362	+
	363	+static void __exit s3c24xx_uda134x_exit(void)
	364	+{
	365	+ platform_driver_unregister(&s3c24xx_uda134x_driver);
	366	+}
	367	+
	368	+
	369	+module_init(s3c24xx_uda134x_init);
	370	+module_exit(s3c24xx_uda134x_exit);
	371	+
	372	+MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
	373	+MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
	374	+MODULE_LICENSE("GPL");