merging android-tegra-2.6.36 into git-master/linux-2.6/android-tegra-2.6.36

Conflicts:
	arch/arm/mach-tegra/fuse.c
	drivers/misc/Makefile

Change-Id: I300b925d78b31efe00c342190d8dbd50e2e81230

3 files changed, 300 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 8a3b4579dd2d..c37ebfaad5c4 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -340,6 +340,14 @@ config SENSORS_AK8975
 	  If you say yes here you get support for Asahi Kasei's
 	  orientation sensor AK8975.
 
+config SENSORS_NCT1008
+	tristate "ON Semiconductor Temperature Sensor"
+	default n
+	depends on I2C
+	help
+	 Say yes here if you wish to include the ON Semiconductor
+	 NCT1008 Temperature sensor.
+
 config EP93XX_PWM
 	tristate "EP93xx PWM support"
 	depends on ARCH_EP93XX
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index eb16069b545e..c23222e921ec 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -43,3 +43,4 @@ obj-$(CONFIG_APANIC)		+= apanic.o
 obj-$(CONFIG_SENSORS_AK8975)	+= akm8975.o
 obj-$(CONFIG_BCM4329_RFKILL)	+= bcm4329_rfkill.o
 obj-$(CONFIG_SENSORS_MPU3050)	+= mpu3050/
+obj-$(CONFIG_SENSORS_NCT1008)	+= nct1008.o
diff --git a/drivers/misc/nct1008.c b/drivers/misc/nct1008.c
new file mode 100755
index 000000000000..4ae48e4003aa
--- /dev/null
+++ b/drivers/misc/nct1008.c
@@ -0,0 +1,291 @@
+/*
+ * drivers/misc/nct1008.c
+ *
+ * Driver for NCT1008, temperature monitoring device from ON Semiconductors
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+
+#include <linux/nct1008.h>
+
+#define DRIVER_NAME "nct1008"
+
+/* Register Addresses */
+#define LOCAL_TEMP_RD			0x00
+#define STATUS_RD			0x02
+#define CONFIG_RD			0x03
+
+#define CONFIG_WR			0x09
+#define CONV_RATE_WR			0x0A
+#define LOCAL_TEMP_HI_LIMIT_WR		0x0B
+#define EXT_TEMP_HI_LIMIT_HI_BYTE	0x0D
+#define OFFSET_WR			0x11
+#define EXT_THERM_LIMIT_WR		0x19
+#define LOCAL_THERM_LIMIT_WR		0x20
+#define THERM_HYSTERESIS_WR		0x21
+
+/* Configuration Register Bits */
+#define EXTENDED_RANGE_BIT		(0x1 << 2)
+#define THERM2_BIT			(0x1 << 5)
+#define STANDBY_BIT			(0x1 << 6)
+
+/* Max Temperature Measurements */
+#define EXTENDED_RANGE_OFFSET		64U
+#define STANDARD_RANGE_MAX		127U
+#define EXTENDED_RANGE_MAX		(150U + EXTENDED_RANGE_OFFSET)
+
+struct nct1008_data {
+	struct work_struct work;
+	struct i2c_client *client;
+	struct mutex mutex;
+	u8 config;
+	void (*alarm_fn)(bool raised);
+};
+
+static void nct1008_enable(struct i2c_client *client)
+{
+	struct nct1008_data *data = i2c_get_clientdata(client);
+
+	i2c_smbus_write_byte_data(client, CONFIG_WR,
+				  data->config & ~STANDBY_BIT);
+}
+
+static void nct1008_disable(struct i2c_client *client)
+{
+	struct nct1008_data *data = i2c_get_clientdata(client);
+
+	i2c_smbus_write_byte_data(client, CONFIG_WR,
+				  data->config | STANDBY_BIT);
+}
+
+
+static void nct1008_work_func(struct work_struct *work)
+{
+	struct nct1008_data *data = container_of(work, struct nct1008_data, work);
+	int irq = data->client->irq;
+
+	mutex_lock(&data->mutex);
+
+	if (data->alarm_fn) {
+		/* Therm2 line is active low */
+		data->alarm_fn(!gpio_get_value(irq_to_gpio(irq)));
+	}
+
+	mutex_unlock(&data->mutex);
+}
+
+static irqreturn_t nct1008_irq(int irq, void *dev_id)
+{
+	struct nct1008_data *data = dev_id;
+	schedule_work(&data->work);
+
+	return IRQ_HANDLED;
+}
+
+static inline u8 value_to_temperature(bool extended, u8 value)
+{
+	return (extended ? (u8)(value - EXTENDED_RANGE_OFFSET) : value);
+}
+
+static inline u8 temperature_to_value(bool extended, u8 temp)
+{
+	return (extended ? (u8)(temp + EXTENDED_RANGE_OFFSET) : temp);
+}
+
+static int __devinit nct1008_configure_sensor(struct nct1008_data* data)
+{
+	struct i2c_client *client           = data->client;
+	struct nct1008_platform_data *pdata = client->dev.platform_data;
+	u8 value;
+	int err;
+
+	if (!pdata || !pdata->supported_hwrev)
+		return -ENODEV;
+
+	/*
+	 * Initial Configuration - device is placed in standby and
+	 * ALERT/THERM2 pin is configured as THERM2
+	 */
+	data->config = value = pdata->ext_range ?
+		(STANDBY_BIT | THERM2_BIT | EXTENDED_RANGE_BIT) :
+		(STANDBY_BIT | THERM2_BIT);
+
+	err = i2c_smbus_write_byte_data(client, CONFIG_WR, value);
+	if (err < 0)
+		goto error;
+
+	/* Temperature conversion rate */
+	err = i2c_smbus_write_byte_data(client, CONV_RATE_WR, pdata->conv_rate);
+	if (err < 0)
+		goto error;
+
+	/* External temperature h/w shutdown limit */
+	value = temperature_to_value(pdata->ext_range, pdata->shutdown_ext_limit);
+	err = i2c_smbus_write_byte_data(client, EXT_THERM_LIMIT_WR, value);
+	if (err < 0)
+		goto error;
+
+	/* Local temperature h/w shutdown limit */
+	value = temperature_to_value(pdata->ext_range, pdata->shutdown_local_limit);
+	err = i2c_smbus_write_byte_data(client, LOCAL_THERM_LIMIT_WR, value);
+	if (err < 0)
+		goto error;
+
+	/* External Temperature Throttling limit */
+	value = temperature_to_value(pdata->ext_range, pdata->throttling_ext_limit);
+	err = i2c_smbus_write_byte_data(client, EXT_TEMP_HI_LIMIT_HI_BYTE, value);
+	if (err < 0)
+		goto error;
+
+	/* Local Temperature Throttling limit */
+	value = pdata->ext_range ? EXTENDED_RANGE_MAX : STANDARD_RANGE_MAX;
+	err = i2c_smbus_write_byte_data(client, LOCAL_TEMP_HI_LIMIT_WR, value);
+	if (err < 0)
+		goto error;
+
+	/* Remote channel offset */
+	err = i2c_smbus_write_byte_data(client, OFFSET_WR, pdata->offset);
+	if (err < 0)
+		goto error;
+
+	/* THERM hysteresis */
+	err = i2c_smbus_write_byte_data(client, THERM_HYSTERESIS_WR, pdata->hysteresis);
+	if (err < 0)
+		goto error;
+
+	data->alarm_fn = pdata->alarm_fn;
+	return 0;
+error:
+	return err;
+}
+
+static int __devinit nct1008_configure_irq(struct nct1008_data *data)
+{
+	INIT_WORK(&data->work, nct1008_work_func);
+
+	return request_irq(data->client->irq, nct1008_irq, IRQF_TRIGGER_RISING |
+				IRQF_TRIGGER_FALLING, DRIVER_NAME, data);
+}
+
+static int __devinit nct1008_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct nct1008_data *data;
+	int err;
+
+	data = kzalloc(sizeof(struct nct1008_data), GFP_KERNEL);
+
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->mutex);
+
+	err = nct1008_configure_sensor(data);	/* sensor is in standby */
+	if (err < 0)
+		goto error;
+
+	err = nct1008_configure_irq(data);
+	if (err < 0)
+		goto error;
+
+	nct1008_enable(client);		/* sensor is running */
+
+	schedule_work(&data->work);		/* check initial state */
+
+	return 0;
+
+error:
+	kfree(data);
+	return err;
+}
+
+static int __devexit nct1008_remove(struct i2c_client *client)
+{
+	struct nct1008_data *data = i2c_get_clientdata(client);
+
+	free_irq(data->client->irq, data);
+	cancel_work_sync(&data->work);
+	kfree(data);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int nct1008_suspend(struct i2c_client *client, pm_message_t state)
+{
+	disable_irq(client->irq);
+	nct1008_disable(client);
+
+	return 0;
+}
+
+static int nct1008_resume(struct i2c_client *client)
+{
+	struct nct1008_data *data = i2c_get_clientdata(client);
+
+	nct1008_enable(client);
+	enable_irq(client->irq);
+	schedule_work(&data->work);
+
+	return 0;
+}
+#endif
+
+static const struct i2c_device_id nct1008_id[] = {
+	{ DRIVER_NAME, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, nct1008_id);
+
+static struct i2c_driver nct1008_driver = {
+	.driver = {
+		.name	= DRIVER_NAME,
+	},
+	.probe		= nct1008_probe,
+	.remove		= __devexit_p(nct1008_remove),
+	.id_table	= nct1008_id,
+#ifdef CONFIG_PM
+	.suspend	= nct1008_suspend,
+	.resume		= nct1008_resume,
+#endif
+};
+
+static int __init nct1008_init(void)
+{
+	return i2c_add_driver(&nct1008_driver);
+}
+
+static void __exit nct1008_exit(void)
+{
+	i2c_del_driver(&nct1008_driver);
+}
+
+MODULE_DESCRIPTION("Temperature sensor driver for OnSemi NCT1008");
+MODULE_LICENSE("GPL");
+
+module_init (nct1008_init);
+module_exit (nct1008_exit);