Message-Id: <1402468095-14678-1-git-send-email-hs@denx.de>
Date:	Wed, 11 Jun 2014 08:28:15 +0200
From:	Heiko Schocher <hs@...x.de>
To:	lm-sensors@...sensors.org
Cc:	Heiko Schocher <hs@...x.de>, Jean Delvare <khali@...ux-fr.org>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 09/13] hwmon: Driver for TI TMP103 temperature sensor

Driver for the TI TMP103.

The TI TMP103 is similar to the TMP102.  It differs from the TMP102
by having only 8 bit registers.

Signed-off-by: Heiko Schocher <hs@...x.de>
Cc: Jean Delvare <khali@...ux-fr.org>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: linux-kernel@...r.kernel.org
---
 Documentation/devicetree/bindings/hwmon/tmp103 |  30 +++
 drivers/hwmon/Kconfig                          |  10 +
 drivers/hwmon/Makefile                         |   1 +
 drivers/hwmon/tmp103.c                         | 281 +++++++++++++++++++++++++
 4 files changed, 322 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/tmp103
 create mode 100644 drivers/hwmon/tmp103.c

diff --git a/Documentation/devicetree/bindings/hwmon/tmp103 b/Documentation/devicetree/bindings/hwmon/tmp103
new file mode 100644
index 0000000..36d7b36
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/tmp103
@@ -0,0 +1,30 @@
+Kernel driver tmp103
+====================
+
+Supported chips:
+  * Texas Instruments TMP103
+    Prefix: 'tmp103'
+    Addresses scanned: none
+    Product info and datasheet: http://www.ti.com/product/tmp103
+
+Author:
+	Heiko Schocher <hs@...x.de>
+
+Description
+-----------
+
+The TMP103 is a digital output temperature sensor in a four-ball
+wafer chip-scale package (WCSP). The TMP103 is capable of reading
+temperatures to a resolution of 1°C. The TMP103 is specified for
+operation over a temperature range of –40°C to +125°C.
+
+Resolution: 8 Bits
+Accuracy: ±1°C Typ (–10°C to +100°C)
+
+The driver provides the common sysfs-interface for temperatures (see
+Documentation/hwmon/sysfs-interface under Temperatures).
+
+Required node properties:
+- compatible: manufacturer and chip name
+		"ti,tmp103"
+- reg: I2C bus address of the device
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 0034316..0f44dbb 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1381,6 +1381,16 @@ config SENSORS_TMP102
 	  This driver can also be built as a module.  If so, the module
 	  will be called tmp102.
 
+config SENSORS_TMP103
+	tristate "Texas Instruments TMP103"
+	depends on I2C
+	help
+	  If you say yes here you get support for Texas Instruments TMP103
+	  sensor chips.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called tmp103.
+
 config SENSORS_TMP401
 	tristate "Texas Instruments TMP401 and compatibles"
 	depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 11798ad..8e2f6a2 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -134,6 +134,7 @@ obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
 obj-$(CONFIG_SENSORS_AMC6821)	+= amc6821.o
 obj-$(CONFIG_SENSORS_THMC50)	+= thmc50.o
 obj-$(CONFIG_SENSORS_TMP102)	+= tmp102.o
+obj-$(CONFIG_SENSORS_TMP103)	+= tmp103.o
 obj-$(CONFIG_SENSORS_TMP401)	+= tmp401.o
 obj-$(CONFIG_SENSORS_TMP421)	+= tmp421.o
 obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc-hwmon.o
diff --git a/drivers/hwmon/tmp103.c b/drivers/hwmon/tmp103.c
new file mode 100644
index 0000000..0bd33d6
--- /dev/null
+++ b/drivers/hwmon/tmp103.c
@@ -0,0 +1,281 @@
+/*
+ * Texas Instruments TMP103 SMBus temperature sensor driver
+ * Copyright (C) 2014 Heiko Schocher <hs@...x.de>
+ *
+ * Based on:
+ * Texas Instruments TMP102 SMBus temperature sensor driver
+ *
+ * Copyright (C) 2010 Steven King <sfking@...dc.com>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/jiffies.h>
+
+#define	DRIVER_NAME "tmp103"
+
+#define	TMP103_TEMP_REG			0x00
+#define	TMP103_CONF_REG			0x01
+#define	TMP103_TLOW_REG			0x02
+#define	TMP103_THIGH_REG		0x03
+
+#define		TMP103_CONF_M0		0x01
+#define		TMP103_CONF_M1		0x02
+#define		TMP103_CONF_LC		0x04
+#define		TMP103_CONF_FL		0x08
+#define		TMP103_CONF_FH		0x10
+#define		TMP103_CONF_CR0		0x20
+#define		TMP103_CONF_CR1		0x40
+#define		TMP103_CONF_ID		0x80
+#define		TMP103_CONF_SD		(TMP103_CONF_M0 | TMP103_CONF_M1)
+
+struct tmp103 {
+	struct device *hwmon_dev;
+	struct mutex lock;
+	u16 config_orig;
+	unsigned long last_update;
+	int temp[3];
+};
+
+static inline int tmp103_reg_to_mC(s8 val)
+{
+	return val * 1000;
+}
+
+static inline u8 tmp103_mC_to_reg(int val)
+{
+	return val / 1000;
+}
+
+static const u8 tmp103_reg[] = {
+	TMP103_TEMP_REG,
+	TMP103_TLOW_REG,
+	TMP103_THIGH_REG,
+};
+
+static struct tmp103 *tmp103_update_device(struct i2c_client *client)
+{
+	struct tmp103 *tmp103 = i2c_get_clientdata(client);
+
+	mutex_lock(&tmp103->lock);
+	if (time_after(jiffies, tmp103->last_update + HZ / 3)) {
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(tmp103->temp); ++i) {
+			int status = i2c_smbus_read_byte_data(client,
+							 tmp103_reg[i]);
+			if (status > -1)
+				tmp103->temp[i] = tmp103_reg_to_mC(status);
+		}
+		tmp103->last_update = jiffies;
+	}
+	mutex_unlock(&tmp103->lock);
+	return tmp103;
+}
+
+static ssize_t tmp103_show_temp(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+	struct tmp103 *tmp103 = tmp103_update_device(to_i2c_client(dev));
+
+	return sprintf(buf, "%d\n", tmp103->temp[sda->index]);
+}
+
+static ssize_t tmp103_set_temp(struct device *dev,
+			       struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct tmp103 *tmp103 = i2c_get_clientdata(client);
+	long val;
+	int status;
+
+	if (kstrtol(buf, 10, &val) < 0)
+		return -EINVAL;
+	val = clamp_val(val, -55000, 128000);
+
+	mutex_lock(&tmp103->lock);
+	tmp103->temp[sda->index] = val;
+	status = i2c_smbus_write_byte_data(client, tmp103_reg[sda->index],
+					      tmp103_mC_to_reg(val));
+	mutex_unlock(&tmp103->lock);
+	return status ? : count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL , 0);
+
+static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp103_show_temp,
+			  tmp103_set_temp, 1);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
+			  tmp103_set_temp, 2);
+
+static struct attribute *tmp103_attributes[] = {
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group tmp103_attr_group = {
+	.attrs = tmp103_attributes,
+};
+
+#define TMP103_CONFIG		(TMP103_CONF_CR1 | TMP103_CONF_M1)
+#define TMP103_CONFIG_RD_ONLY	(TMP103_CONF_CR1 | TMP103_CONF_M1)
+
+static int tmp103_probe(struct i2c_client *client,
+				  const struct i2c_device_id *id)
+{
+	struct tmp103 *tmp103;
+	int status;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_WORD_DATA)) {
+		dev_err(&client->dev,
+			"adapter doesn't support SMBus word transactions\n");
+		return -ENODEV;
+	}
+
+	tmp103 = devm_kzalloc(&client->dev, sizeof(*tmp103), GFP_KERNEL);
+	if (!tmp103)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, tmp103);
+
+	status = i2c_smbus_read_byte_data(client, TMP103_CONF_REG);
+	if (status < 0) {
+		dev_err(&client->dev, "error reading config register\n");
+		return status;
+	}
+	tmp103->config_orig = status;
+	status = i2c_smbus_write_byte_data(client, TMP103_CONF_REG,
+					      TMP103_CONFIG);
+	if (status < 0) {
+		dev_err(&client->dev, "error writing config register\n");
+		goto fail_restore_config;
+	}
+	status = i2c_smbus_read_byte_data(client, TMP103_CONF_REG);
+	if (status < 0) {
+		dev_err(&client->dev, "error reading config register\n");
+		goto fail_restore_config;
+	}
+	if (status != TMP103_CONFIG) {
+		dev_err(&client->dev, "config settings did not stick\n");
+		status = -ENODEV;
+		goto fail_restore_config;
+	}
+	tmp103->last_update = jiffies - HZ;
+	mutex_init(&tmp103->lock);
+
+	status = sysfs_create_group(&client->dev.kobj, &tmp103_attr_group);
+	if (status) {
+		dev_dbg(&client->dev, "could not create sysfs files\n");
+		goto fail_restore_config;
+	}
+	tmp103->hwmon_dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(tmp103->hwmon_dev)) {
+		dev_dbg(&client->dev, "unable to register hwmon device\n");
+		status = PTR_ERR(tmp103->hwmon_dev);
+		goto fail_remove_sysfs;
+	}
+
+	dev_info(&client->dev, "initialized\n");
+
+	return 0;
+
+fail_remove_sysfs:
+	sysfs_remove_group(&client->dev.kobj, &tmp103_attr_group);
+fail_restore_config:
+	i2c_smbus_write_word_swapped(client, TMP103_CONF_REG,
+				     tmp103->config_orig);
+	return status;
+}
+
+static int tmp103_remove(struct i2c_client *client)
+{
+	struct tmp103 *tmp103 = i2c_get_clientdata(client);
+
+	hwmon_device_unregister(tmp103->hwmon_dev);
+	sysfs_remove_group(&client->dev.kobj, &tmp103_attr_group);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int tmp103_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int config;
+
+	config = i2c_smbus_read_word_swapped(client, TMP103_CONF_REG);
+	if (config < 0)
+		return config;
+
+	config &= ~TMP103_CONF_SD;
+	return i2c_smbus_write_word_swapped(client, TMP103_CONF_REG, config);
+}
+
+static int tmp103_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int config;
+
+	config = i2c_smbus_read_word_swapped(client, TMP103_CONF_REG);
+	if (config < 0)
+		return config;
+
+	config |= TMP103_CONF_SD;
+	return i2c_smbus_write_word_swapped(client, TMP103_CONF_REG, config);
+}
+
+static const struct dev_pm_ops tmp103_dev_pm_ops = {
+	.suspend	= tmp103_suspend,
+	.resume		= tmp103_resume,
+};
+
+#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
+#else
+#define	TMP103_DEV_PM_OPS NULL
+#endif /* CONFIG_PM */
+
+static const struct i2c_device_id tmp103_id[] = {
+	{ DRIVER_NAME, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tmp103_id);
+
+static struct i2c_driver tmp103_driver = {
+	.driver.name	= DRIVER_NAME,
+	.driver.pm	= TMP103_DEV_PM_OPS,
+	.probe		= tmp103_probe,
+	.remove		= tmp103_remove,
+	.id_table	= tmp103_id,
+};
+
+module_i2c_driver(tmp103_driver);
+
+MODULE_AUTHOR("Heiko Schocher <hs@...x.de>");
+MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
+MODULE_LICENSE("GPL");
-- 
1.8.3.1

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