ARM: EXYNOS4: NURI Support NTC

index 9d903d4..622972c 100644
@@ -9,9 +9,11 @@
  * published by the Free Software Foundation.
 */
 
+#include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/platform_device.h>
+#include <linux/platform_data/ntc_thermistor.h>
 
 #include <mach/irqs.h>
 #include <mach/map.h>

@@ -44,3 +46,58 @@ struct platform_device s3c_device_adc = {
 	.num_resources	= ARRAY_SIZE(s3c_adc_resource),
 	.resource	= s3c_adc_resource,
 };
+
+/* NTC Thermistor. Attached to S3C-ADC in some Samsung SoC Devices */
+struct platform_device s3c_device_adc_ntc_thermistor;
+static int ntc_adc_num = -EINVAL; /* Uninitialized */
+static struct s3c_adc_client *ntc_adc;
+
+int __init s3c_adc_ntc_init(int port)
+{
+	int err = 0;
+
+	if (port < 0 || port > 9)
+		return -EINVAL;
+	ntc_adc_num = port;
+
+	ntc_adc = s3c_adc_register(&s3c_device_adc_ntc_thermistor, NULL, NULL,
+				   0);
+	if (IS_ERR(ntc_adc)) {
+		err = PTR_ERR(ntc_adc);
+		ntc_adc = NULL;
+		return err;
+	}
+
+	return 0;
+}
+
+static int read_thermistor_uV(void)
+{
+	int val;
+	s64 converted;
+
+	WARN(ntc_adc == NULL || ntc_adc_num < 0,
+	     "S3C NTC-ADC is not initialized for %s.\n", __func__);
+
+	val = s3c_adc_read(ntc_adc, ntc_adc_num);
+
+	converted = 3300000LL * (s64) val;
+	converted >>= 12;
+
+	return converted;
+}
+
+static struct ntc_thermistor_platform_data ntc_adc_pdata = {
+	.read_uV	= read_thermistor_uV,
+	.pullup_uV	= 3300000, /* voltage of vdd for ADC */
+	.pullup_ohm	= 100000,
+	.pulldown_ohm	= 100000,
+	.connect	= NTC_CONNECTED_GROUND,
+};
+
+struct platform_device s3c_device_adc_ntc_thermistor = {
+	.name			= "ncp15wb473",
+	.dev			= {
+		.platform_data = &ntc_adc_pdata,
+	},
+};

index 3c87779..f83b1da 100644
@@ -61,6 +61,7 @@ extern struct platform_device s3c_device_i2c6;
 extern struct platform_device s3c_device_i2c7;
 extern struct platform_device s3c_device_rtc;
 extern struct platform_device s3c_device_adc;
+extern struct platform_device s3c_device_adc_ntc_thermistor;
 extern struct platform_device s3c_device_sdi;
 extern struct platform_device s3c_device_iis;
 extern struct platform_device s3c_device_hwmon;

index 622972c..526097a 100644
@@ -22,6 +22,8 @@
 #include <plat/devs.h>
 #include <plat/cpu.h>
 
+#include "../../../fs/sysfs/sysfs.h"
+
 static struct resource s3c_adc_resource[] = {
 	[0] = {
 		.start = SAMSUNG_PA_ADC,

@@ -101,3 +103,63 @@ struct platform_device s3c_device_adc_ntc_thermistor = {
 		.platform_data = &ntc_adc_pdata,
 	},
 };
+
+static struct device_attribute *ntc_attr;
+
+static int init_s3c_adc_ntc_read(void)
+{
+	struct kobject *ntc;
+	struct sysfs_dirent *ntc_d;
+
+	ntc = &s3c_device_adc_ntc_thermistor.dev.kobj;
+	ntc_d = sysfs_get_dirent(ntc->sd, get_ktype(ntc)->namespace(ntc),
+				 "temp1_input");
+	if (!ntc_d || sysfs_type(ntc_d) != SYSFS_KOBJ_ATTR) {
+		dev_err(&s3c_device_adc_ntc_thermistor.dev,
+			"Cannot initialize thermistor dirent info.\n");
+		if (ntc_d)
+			sysfs_put(ntc_d);
+		return -ENODEV;
+	}
+	ntc_attr = container_of(ntc_d->s_attr.attr, struct device_attribute,
+				attr);
+
+	sysfs_put(ntc_d);
+	if (IS_ERR(ntc_attr)) {
+		dev_err(&s3c_device_adc_ntc_thermistor.dev,
+			"Cannot access NTC thermistor.\n");
+		return PTR_ERR(ntc_attr);
+	}
+
+	return 0;
+}
+
+/* A helper function to read values from NTC, in 1/1000 Centigrade */
+int read_s3c_adc_ntc(int *mC)
+{
+	char buf[32];
+	int ret;
+
+	/* init should be done after ADC and NTC are probed */
+	if (ntc_attr == NULL) {
+		ret = init_s3c_adc_ntc_read();
+		if (ret) {
+			if (ntc_attr == NULL)
+				ntc_attr = ERR_PTR(ret);
+			return ret;
+		}
+	}
+
+	if (IS_ERR(ntc_attr))
+		return -ENODEV;
+
+	if (!ntc_attr->show)
+		return -EINVAL;
+
+	ret = ntc_attr->show(&s3c_device_adc_ntc_thermistor.dev, ntc_attr, buf);
+	if (ret < 0)
+		return ret;
+	sscanf(buf, "%d", mC);
+
+	return 0;
+}

new file mode 100644
index 0000000..3d74118
@@ -0,0 +1,19 @@
+/* linux/arch/arm/plat-samsung/include/plat/adc-ntc.h
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * NTC Thermistor attached to Samsung ADC Controller driver information
+ *
+ * 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.
+*/
+
+#ifndef __PLAT_ADC_NTC_H
+#define __PLAT_ADC_NTC_H __FILE__
+
+extern void s3c_adc_ntc_init(int port);
+extern int read_s3c_adc_ntc(int *mC);
+
+#endif /* __PLAT_ADC_NTC_H */

index bdf7a5c..cd8bc06 100644
@@ -40,6 +40,7 @@
 #include <plat/clock.h>
 #include <plat/gpio-cfg.h>
 #include <plat/iic.h>
+#include <plat/adc-ntc.h>
 
 #include <mach/map.h>
 

@@ -1098,6 +1099,7 @@ static struct platform_device *nuri_devices[] __initdata = {
 	&s3c_device_i2c3,
 	&i2c9_gpio,
 	&s3c_device_adc,
+	&s3c_device_adc_ntc_thermistor,
 	&s3c_device_rtc,
 
 	/* NURI Devices */

@@ -1133,6 +1135,8 @@ static void __init nuri_machine_init(void)
 	nuri_ehci_init();
 	clk_xusbxti.rate = 24000000;
 
+	s3c_adc_ntc_init(6); /* NTC Thermistor uses ADC port 6 */
+
 	/* Last */
 	platform_add_devices(nuri_devices, ARRAY_SIZE(nuri_devices));
 }