hwmon: LM95241 driver (06160327) · Commits · 戴 / test

drivers/hwmon/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -582,6 +582,15 @@ config SENSORS_LTC4245
		This driver can also be built as a module. If so, the module will
		be called ltc4245.

		config SENSORS_LM95241
		tristate "National Semiconductor LM95241 sensor chip"
		depends on I2C
		help
		If you say yes here you get support for LM95241 sensor chip.

		This driver can also be built as a module. If so, the module
		will be called lm95241.

		config SENSORS_MAX1111
		tristate "Maxim MAX1111 Multichannel, Serial 8-bit ADC chip"
		depends on SPI_MASTER

drivers/hwmon/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -64,6 +64,7 @@ obj-$(CONFIG_SENSORS_LM87) += lm87.o
		obj-$(CONFIG_SENSORS_LM90) += lm90.o
		obj-$(CONFIG_SENSORS_LM92) += lm92.o
		obj-$(CONFIG_SENSORS_LM93) += lm93.o
		obj-$(CONFIG_SENSORS_LM95241) += lm95241.o
		obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
		obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
		obj-$(CONFIG_SENSORS_MAX1619) += max1619.o

drivers/hwmon/lm95241.c

0 → 100644

+527 −0

Original line number	Diff line number	Diff line
		/*
		* lm95241.c - Part of lm_sensors, Linux kernel modules for hardware
		* monitoring
		* Copyright (C) 2008 Davide Rizzo <elpa-rizzo@gmail.com>
		*
		* Based on the max1619 driver. The LM95241 is a sensor chip made by National
		* Semiconductors.
		* It reports up to three temperatures (its own plus up to
		* two external ones). Complete datasheet can be
		* obtained from National's website at:
		* http://www.national.com/ds.cgi/LM/LM95241.pdf
		*
		* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/slab.h>
		#include <linux/jiffies.h>
		#include <linux/i2c.h>
		#include <linux/hwmon.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/err.h>
		#include <linux/mutex.h>
		#include <linux/sysfs.h>

		static const unsigned short normal_i2c[] = {
		0x19, 0x2a, 0x2b, I2C_CLIENT_END};

		/* Insmod parameters */
		I2C_CLIENT_INSMOD_1(lm95241);

		/* LM95241 registers */
		#define LM95241_REG_R_MAN_ID 0xFE
		#define LM95241_REG_R_CHIP_ID 0xFF
		#define LM95241_REG_R_STATUS 0x02
		#define LM95241_REG_RW_CONFIG 0x03
		#define LM95241_REG_RW_REM_FILTER 0x06
		#define LM95241_REG_RW_TRUTHERM 0x07
		#define LM95241_REG_W_ONE_SHOT 0x0F
		#define LM95241_REG_R_LOCAL_TEMPH 0x10
		#define LM95241_REG_R_REMOTE1_TEMPH 0x11
		#define LM95241_REG_R_REMOTE2_TEMPH 0x12
		#define LM95241_REG_R_LOCAL_TEMPL 0x20
		#define LM95241_REG_R_REMOTE1_TEMPL 0x21
		#define LM95241_REG_R_REMOTE2_TEMPL 0x22
		#define LM95241_REG_RW_REMOTE_MODEL 0x30

		/* LM95241 specific bitfields */
		#define CFG_STOP 0x40
		#define CFG_CR0076 0x00
		#define CFG_CR0182 0x10
		#define CFG_CR1000 0x20
		#define CFG_CR2700 0x30
		#define R1MS_SHIFT 0
		#define R2MS_SHIFT 2
		#define R1MS_MASK (0x01 << (R1MS_SHIFT))
		#define R2MS_MASK (0x01 << (R2MS_SHIFT))
		#define R1DF_SHIFT 1
		#define R2DF_SHIFT 2
		#define R1DF_MASK (0x01 << (R1DF_SHIFT))
		#define R2DF_MASK (0x01 << (R2DF_SHIFT))
		#define R1FE_MASK 0x01
		#define R2FE_MASK 0x05
		#define TT1_SHIFT 0
		#define TT2_SHIFT 4
		#define TT_OFF 0
		#define TT_ON 1
		#define TT_MASK 7
		#define MANUFACTURER_ID 0x01
		#define DEFAULT_REVISION 0xA4

		/* Conversions and various macros */
		#define TEMP_FROM_REG(val_h, val_l) (((val_h) & 0x80 ? (val_h) - 0x100 : \
		(val_h)) * 1000 + (val_l) * 1000 / 256)

		/* Functions declaration */
		static int lm95241_attach_adapter(struct i2c_adapter *adapter);
		static int lm95241_detect(struct i2c_adapter *adapter, int address,
		int kind);
		static void lm95241_init_client(struct i2c_client *client);
		static int lm95241_detach_client(struct i2c_client *client);
		static struct lm95241_data lm95241_update_device(struct device dev);

		/* Driver data (common to all clients) */
		static struct i2c_driver lm95241_driver = {
		.driver = {
		.name = "lm95241",
		},
		.attach_adapter = lm95241_attach_adapter,
		.detach_client = lm95241_detach_client,
		};

		/* Client data (each client gets its own) */
		struct lm95241_data {
		struct i2c_client client;
		struct device *hwmon_dev;
		struct mutex update_lock;
		unsigned long last_updated, rate; /* in jiffies */
		char valid; /* zero until following fields are valid */
		/* registers values */
		u8 local_h, local_l; /* local */
		u8 remote1_h, remote1_l; /* remote1 */
		u8 remote2_h, remote2_l; /* remote2 */
		u8 config, model, trutherm;
		};

		/* Sysfs stuff */
		#define show_temp(value) \
		static ssize_t show_##value(struct device *dev, \
		struct device_attribute attr, char buf) \
		{ \
		struct lm95241_data *data = lm95241_update_device(dev); \
		snprintf(buf, PAGE_SIZE - 1, "%d\n", \
		TEMP_FROM_REG(data->value##_h, data->value##_l)); \
		return strlen(buf); \
		}
		show_temp(local);
		show_temp(remote1);
		show_temp(remote2);

		static ssize_t show_rate(struct device dev, struct device_attribute attr,
		char *buf)
		{
		struct lm95241_data *data = lm95241_update_device(dev);

		snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->rate / HZ);
		return strlen(buf);
		}

		static ssize_t set_rate(struct device dev, struct device_attribute attr,
		const char *buf, size_t count)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct lm95241_data *data = i2c_get_clientdata(client);

		strict_strtol(buf, 10, &data->rate);
		data->rate = data->rate * HZ / 1000;

		return count;
		}

		#define show_type(flag) \
		static ssize_t show_type##flag(struct device *dev, \
		struct device_attribute attr, char buf) \
		{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct lm95241_data *data = i2c_get_clientdata(client); \
		\
		snprintf(buf, PAGE_SIZE - 1, \
		data->model & R##flag##MS_MASK ? "1\n" : "2\n"); \
		return strlen(buf); \
		}
		show_type(1);
		show_type(2);

		#define show_min(flag) \
		static ssize_t show_min##flag(struct device *dev, \
		struct device_attribute attr, char buf) \
		{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct lm95241_data *data = i2c_get_clientdata(client); \
		\
		snprintf(buf, PAGE_SIZE - 1, \
		data->config & R##flag##DF_MASK ? \
		"-127000\n" : "0\n"); \
		return strlen(buf); \
		}
		show_min(1);
		show_min(2);

		#define show_max(flag) \
		static ssize_t show_max##flag(struct device *dev, \
		struct device_attribute attr, char buf) \
		{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct lm95241_data *data = i2c_get_clientdata(client); \
		\
		snprintf(buf, PAGE_SIZE - 1, \
		data->config & R##flag##DF_MASK ? \
		"127000\n" : "255000\n"); \
		return strlen(buf); \
		}
		show_max(1);
		show_max(2);

		#define set_type(flag) \
		static ssize_t set_type##flag(struct device *dev, \
		struct device_attribute *attr, \
		const char *buf, size_t count) \
		{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct lm95241_data *data = i2c_get_clientdata(client); \
		\
		long val; \
		strict_strtol(buf, 10, &val); \
		\
		if ((val == 1) \|\| (val == 2)) { \
		\
		mutex_lock(&data->update_lock); \
		\
		data->trutherm &= ~(TT_MASK << TT##flag##_SHIFT); \
		if (val == 1) { \
		data->model \|= R##flag##MS_MASK; \
		data->trutherm \|= (TT_ON << TT##flag##_SHIFT); \
		} \
		else { \
		data->model &= ~R##flag##MS_MASK; \
		data->trutherm \|= (TT_OFF << TT##flag##_SHIFT); \
		} \
		\
		data->valid = 0; \
		\
		i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL, \
		data->model); \
		i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM, \
		data->trutherm); \
		\
		mutex_unlock(&data->update_lock); \
		\
		} \
		return count; \
		}
		set_type(1);
		set_type(2);

		#define set_min(flag) \
		static ssize_t set_min##flag(struct device *dev, \
		struct device_attribute devattr, const char buf, size_t count) \
		{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct lm95241_data *data = i2c_get_clientdata(client); \
		\
		long val; \
		strict_strtol(buf, 10, &val); \
		\
		mutex_lock(&data->update_lock); \
		\
		if (val < 0) \
		data->config \|= R##flag##DF_MASK; \
		else \
		data->config &= ~R##flag##DF_MASK; \
		\
		data->valid = 0; \
		\
		i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, \
		data->config); \
		\
		mutex_unlock(&data->update_lock); \
		\
		return count; \
		}
		set_min(1);
		set_min(2);

		#define set_max(flag) \
		static ssize_t set_max##flag(struct device *dev, \
		struct device_attribute devattr, const char buf, size_t count) \
		{ \
		struct i2c_client *client = to_i2c_client(dev); \
		struct lm95241_data *data = i2c_get_clientdata(client); \
		\
		long val; \
		strict_strtol(buf, 10, &val); \
		\
		mutex_lock(&data->update_lock); \
		\
		if (val <= 127000) \
		data->config \|= R##flag##DF_MASK; \
		else \
		data->config &= ~R##flag##DF_MASK; \
		\
		data->valid = 0; \
		\
		i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, \
		data->config); \
		\
		mutex_unlock(&data->update_lock); \
		\
		return count; \
		}
		set_max(1);
		set_max(2);

		static DEVICE_ATTR(temp1_input, S_IRUGO, show_local, NULL);
		static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote1, NULL);
		static DEVICE_ATTR(temp3_input, S_IRUGO, show_remote2, NULL);
		static DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type1, set_type1);
		static DEVICE_ATTR(temp3_type, S_IWUSR \| S_IRUGO, show_type2, set_type2);
		static DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_min1, set_min1);
		static DEVICE_ATTR(temp3_min, S_IWUSR \| S_IRUGO, show_min2, set_min2);
		static DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_max1, set_max1);
		static DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_max2, set_max2);
		static DEVICE_ATTR(rate, S_IWUSR \| S_IRUGO, show_rate, set_rate);

		static struct attribute *lm95241_attributes[] = {
		&dev_attr_temp1_input.attr,
		&dev_attr_temp2_input.attr,
		&dev_attr_temp3_input.attr,
		&dev_attr_temp2_type.attr,
		&dev_attr_temp3_type.attr,
		&dev_attr_temp2_min.attr,
		&dev_attr_temp3_min.attr,
		&dev_attr_temp2_max.attr,
		&dev_attr_temp3_max.attr,
		&dev_attr_rate.attr,
		NULL
		};

		static const struct attribute_group lm95241_group = {
		.attrs = lm95241_attributes,
		};

		/* Init/exit code */
		static int lm95241_attach_adapter(struct i2c_adapter *adapter)
		{
		if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
		return i2c_probe(adapter, &addr_data, lm95241_detect);
		}

		/*
		* The following function does more than just detection. If detection
		* succeeds, it also registers the new chip.
		*/
		static int lm95241_detect(struct i2c_adapter *adapter, int address, int kind)
		{
		struct i2c_client *new_client;
		struct lm95241_data *data;
		int err = 0;
		const char *name = "";

		if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

		data = kzalloc(sizeof(struct lm95241_data), GFP_KERNEL);
		if (!data) {
		err = -ENOMEM;
		goto exit;
		}

		/* The common I2C client data is placed right before the
		LM95241-specific data. */
		new_client = &data->client;
		i2c_set_clientdata(new_client, data);
		new_client->addr = address;
		new_client->adapter = adapter;
		new_client->driver = &lm95241_driver;
		new_client->flags = 0;

		/*
		* Now we do the remaining detection. A negative kind means that
		* the driver was loaded with no force parameter (default), so we
		* must both detect and identify the chip. A zero kind means that
		* the driver was loaded with the force parameter, the detection
		* step shall be skipped. A positive kind means that the driver
		* was loaded with the force parameter and a given kind of chip is
		* requested, so both the detection and the identification steps
		* are skipped.
		*/
		if (kind < 0) { /* detection */
		if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
		!= MANUFACTURER_ID)
		\|\| (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
		< DEFAULT_REVISION)) {
		dev_dbg(&adapter->dev,
		"LM95241 detection failed at 0x%02x.\n",
		address);
		goto exit_free;
		}
		}

		if (kind <= 0) { /* identification */
		if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
		== MANUFACTURER_ID)
		&& (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
		>= DEFAULT_REVISION)) {

		kind = lm95241;

		if (kind <= 0) { /* identification failed */
		dev_info(&adapter->dev, "Unsupported chip\n");
		goto exit_free;
		}
		}
		}

		if (kind == lm95241)
		name = "lm95241";

		/* We can fill in the remaining client fields */
		strlcpy(new_client->name, name, I2C_NAME_SIZE);
		data->valid = 0;
		mutex_init(&data->update_lock);

		/* Tell the I2C layer a new client has arrived */
		err = i2c_attach_client(new_client);
		if (err)
		goto exit_free;

		/* Initialize the LM95241 chip */
		lm95241_init_client(new_client);

		/* Register sysfs hooks */
		err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group);
		if (err)
		goto exit_detach;

		data->hwmon_dev = hwmon_device_register(&new_client->dev);
		if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove_files;
		}

		return 0;

		exit_remove_files:
		sysfs_remove_group(&new_client->dev.kobj, &lm95241_group);
		exit_detach:
		i2c_detach_client(new_client);
		exit_free:
		kfree(data);
		exit:
		return err;
		}

		static void lm95241_init_client(struct i2c_client *client)
		{
		struct lm95241_data *data = i2c_get_clientdata(client);

		data->rate = HZ; /* 1 sec default */
		data->valid = 0;
		data->config = CFG_CR0076;
		data->model = 0;
		data->trutherm = (TT_OFF << TT1_SHIFT) \| (TT_OFF << TT2_SHIFT);

		i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG,
		data->config);
		i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
		R1FE_MASK \| R2FE_MASK);
		i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
		data->trutherm);
		i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
		data->model);
		}

		static int lm95241_detach_client(struct i2c_client *client)
		{
		struct lm95241_data *data = i2c_get_clientdata(client);
		int err;

		hwmon_device_unregister(data->hwmon_dev);
		sysfs_remove_group(&client->dev.kobj, &lm95241_group);

		err = i2c_detach_client(client);
		if (err)
		return err;

		kfree(data);
		return 0;
		}

		static struct lm95241_data lm95241_update_device(struct device dev)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct lm95241_data *data = i2c_get_clientdata(client);

		mutex_lock(&data->update_lock);

		if (time_after(jiffies, data->last_updated + data->rate) \|\|
		!data->valid) {
		dev_dbg(&client->dev, "Updating lm95241 data.\n");
		data->local_h =
		i2c_smbus_read_byte_data(client,
		LM95241_REG_R_LOCAL_TEMPH);
		data->local_l =
		i2c_smbus_read_byte_data(client,
		LM95241_REG_R_LOCAL_TEMPL);
		data->remote1_h =
		i2c_smbus_read_byte_data(client,
		LM95241_REG_R_REMOTE1_TEMPH);
		data->remote1_l =
		i2c_smbus_read_byte_data(client,
		LM95241_REG_R_REMOTE1_TEMPL);
		data->remote2_h =
		i2c_smbus_read_byte_data(client,
		LM95241_REG_R_REMOTE2_TEMPH);
		data->remote2_l =
		i2c_smbus_read_byte_data(client,
		LM95241_REG_R_REMOTE2_TEMPL);
		data->last_updated = jiffies;
		data->valid = 1;
		}

		mutex_unlock(&data->update_lock);

		return data;
		}

		static int __init sensors_lm95241_init(void)
		{
		return i2c_add_driver(&lm95241_driver);
		}

		static void __exit sensors_lm95241_exit(void)
		{
		i2c_del_driver(&lm95241_driver);
		}

		MODULE_AUTHOR("Davide Rizzo <elpa-rizzo@gmail.com>");
		MODULE_DESCRIPTION("LM95241 sensor driver");
		MODULE_LICENSE("GPL");

		module_init(sensors_lm95241_init);
		module_exit(sensors_lm95241_exit);

Admin message