hwmon: Driver for Maxim MAX6639 (a5b79d62) · Commits · e / devices / android_kernel_oneplus_sm7250

Documentation/hwmon/max6639

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		Kernel driver max6639
		=====================

		Supported chips:
		* Maxim MAX6639
		Prefix: 'max6639'
		Addresses scanned: I2C 0x2c, 0x2e, 0x2f
		Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6639.pdf

		Authors:
		He Changqing <hechangqing@semptian.com>
		Roland Stigge <stigge@antcom.de>

		Description
		-----------

		This driver implements support for the Maxim MAX6639. This chip is a 2-channel
		temperature monitor with dual PWM fan speed controller. It can monitor its own
		temperature and one external diode-connected transistor or two external
		diode-connected transistors.

		The following device attributes are implemented via sysfs:

		Attribute R/W Contents
		----------------------------------------------------------------------------
		temp1_input R Temperature channel 1 input (0..150 C)
		temp2_input R Temperature channel 2 input (0..150 C)
		temp1_fault R Temperature channel 1 diode fault
		temp2_fault R Temperature channel 2 diode fault
		temp1_max RW Set THERM temperature for input 1
		(in C, see datasheet)
		temp2_max RW Set THERM temperature for input 2
		temp1_crit RW Set ALERT temperature for input 1
		temp2_crit RW Set ALERT temperature for input 2
		temp1_emergency RW Set OT temperature for input 1
		(in C, see datasheet)
		temp2_emergency RW Set OT temperature for input 2
		pwm1 RW Fan 1 target duty cycle (0..255)
		pwm2 RW Fan 2 target duty cycle (0..255)
		fan1_input R TACH1 fan tachometer input (in RPM)
		fan2_input R TACH2 fan tachometer input (in RPM)
		fan1_fault R Fan 1 fault
		fan2_fault R Fan 2 fault
		temp1_max_alarm R Alarm on THERM temperature on channel 1
		temp2_max_alarm R Alarm on THERM temperature on channel 2
		temp1_crit_alarm R Alarm on ALERT temperature on channel 1
		temp2_crit_alarm R Alarm on ALERT temperature on channel 2
		temp1_emergency_alarm R Alarm on OT temperature on channel 1
		temp2_emergency_alarm R Alarm on OT temperature on channel 2

drivers/hwmon/Kconfig

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		@@ -685,6 +685,16 @@ config SENSORS_MAX1619
		This driver can also be built as a module. If so, the module
		will be called max1619.

		config SENSORS_MAX6639
		tristate "Maxim MAX6639 sensor chip"
		depends on I2C && EXPERIMENTAL
		help
		If you say yes here you get support for the MAX6639
		sensor chips.

		This driver can also be built as a module. If so, the module
		will be called max6639.

		config SENSORS_MAX6650
		tristate "Maxim MAX6650 sensor chip"
		depends on I2C && EXPERIMENTAL

drivers/hwmon/Makefile

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		@@ -84,6 +84,7 @@ obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
		obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o
		obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
		obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
		obj-$(CONFIG_SENSORS_MAX6639) += max6639.o
		obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
		obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
		obj-$(CONFIG_SENSORS_PC87360) += pc87360.o

drivers/hwmon/max6639.c

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		/*
		* max6639.c - Support for Maxim MAX6639
		*
		* 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
		*
		* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
		*
		* based on the initial MAX6639 support from semptian.net
		* by He Changqing <hechangqing@semptian.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.
		*
		* 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/i2c/max6639.h>

		/* Addresses to scan */
		static unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };

		/* The MAX6639 registers, valid channel numbers: 0, 1 */
		#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
		#define MAX6639_REG_STATUS 0x02
		#define MAX6639_REG_OUTPUT_MASK 0x03
		#define MAX6639_REG_GCONFIG 0x04
		#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
		#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
		#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
		#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
		#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
		#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
		#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
		#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
		#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
		#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
		#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
		#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
		#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
		#define MAX6639_REG_DEVID 0x3D
		#define MAX6639_REG_MANUID 0x3E
		#define MAX6639_REG_DEVREV 0x3F

		/* Register bits */
		#define MAX6639_GCONFIG_STANDBY 0x80
		#define MAX6639_GCONFIG_POR 0x40
		#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
		#define MAX6639_GCONFIG_CH2_LOCAL 0x10

		#define MAX6639_FAN_CONFIG1_PWM 0x80

		static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };

		#define FAN_FROM_REG(val, div, rpm_range) ((val) == 0 ? -1 : \
		(val) == 255 ? 0 : (rpm_ranges[rpm_range] * 30) / ((div + 1) * (val)))
		#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) / 1000, 0, 255)

		/*
		* Client data (each client gets its own)
		*/
		struct max6639_data {
		struct device *hwmon_dev;
		struct mutex update_lock;
		char valid; /* !=0 if following fields are valid */
		unsigned long last_updated; /* In jiffies */

		/* Register values sampled regularly */
		u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
		bool temp_fault[2]; /* Detected temperature diode failure */
		u8 fan[2]; /* Register value: TACH count for fans >=30 */
		u8 status; /* Detected channel alarms and fan failures */

		/* Register values only written to */
		u8 pwm[2]; /* Register value: Duty cycle 0..120 */
		u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
		u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
		u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */

		/* Register values initialized only once */
		u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
		u8 rpm_range; /* Index in above rpm_ranges table */
		};

		static struct max6639_data max6639_update_device(struct device dev)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct max6639_data *ret = data;
		int i;
		int status_reg;

		mutex_lock(&data->update_lock);

		if (time_after(jiffies, data->last_updated + 2 * HZ) \|\| !data->valid) {
		int res;

		dev_dbg(&client->dev, "Starting max6639 update\n");

		status_reg = i2c_smbus_read_byte_data(client,
		MAX6639_REG_STATUS);
		if (status_reg < 0) {
		ret = ERR_PTR(status_reg);
		goto abort;
		}

		data->status = status_reg;

		for (i = 0; i < 2; i++) {
		res = i2c_smbus_read_byte_data(client,
		MAX6639_REG_FAN_CNT(i));
		if (res < 0) {
		ret = ERR_PTR(res);
		goto abort;
		}
		data->fan[i] = res;

		res = i2c_smbus_read_byte_data(client,
		MAX6639_REG_TEMP_EXT(i));
		if (res < 0) {
		ret = ERR_PTR(res);
		goto abort;
		}
		data->temp[i] = res >> 5;
		data->temp_fault[i] = res & 0x01;

		res = i2c_smbus_read_byte_data(client,
		MAX6639_REG_TEMP(i));
		if (res < 0) {
		ret = ERR_PTR(res);
		goto abort;
		}
		data->temp[i] \|= res << 3;
		}

		data->last_updated = jiffies;
		data->valid = 1;
		}
		abort:
		mutex_unlock(&data->update_lock);

		return ret;
		}

		static ssize_t show_temp_input(struct device *dev,
		struct device_attribute dev_attr, char buf)
		{
		long temp;
		struct max6639_data *data = max6639_update_device(dev);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		if (IS_ERR(data))
		return PTR_ERR(data);

		temp = data->temp[attr->index] * 125;
		return sprintf(buf, "%ld\n", temp);
		}

		static ssize_t show_temp_fault(struct device *dev,
		struct device_attribute dev_attr, char buf)
		{
		struct max6639_data *data = max6639_update_device(dev);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		if (IS_ERR(data))
		return PTR_ERR(data);

		return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
		}

		static ssize_t show_temp_max(struct device *dev,
		struct device_attribute dev_attr, char buf)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
		}

		static ssize_t set_temp_max(struct device *dev,
		struct device_attribute *dev_attr,
		const char *buf, size_t count)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
		unsigned long val;
		int res;

		res = strict_strtoul(buf, 10, &val);
		if (res)
		return res;

		mutex_lock(&data->update_lock);
		data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
		i2c_smbus_write_byte_data(client,
		MAX6639_REG_THERM_LIMIT(attr->index),
		data->temp_therm[attr->index]);
		mutex_unlock(&data->update_lock);
		return count;
		}

		static ssize_t show_temp_crit(struct device *dev,
		struct device_attribute dev_attr, char buf)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
		}

		static ssize_t set_temp_crit(struct device *dev,
		struct device_attribute *dev_attr,
		const char *buf, size_t count)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
		unsigned long val;
		int res;

		res = strict_strtoul(buf, 10, &val);
		if (res)
		return res;

		mutex_lock(&data->update_lock);
		data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
		i2c_smbus_write_byte_data(client,
		MAX6639_REG_ALERT_LIMIT(attr->index),
		data->temp_alert[attr->index]);
		mutex_unlock(&data->update_lock);
		return count;
		}

		static ssize_t show_temp_emergency(struct device *dev,
		struct device_attribute *dev_attr,
		char *buf)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
		}

		static ssize_t set_temp_emergency(struct device *dev,
		struct device_attribute *dev_attr,
		const char *buf, size_t count)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
		unsigned long val;
		int res;

		res = strict_strtoul(buf, 10, &val);
		if (res)
		return res;

		mutex_lock(&data->update_lock);
		data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
		i2c_smbus_write_byte_data(client,
		MAX6639_REG_OT_LIMIT(attr->index),
		data->temp_ot[attr->index]);
		mutex_unlock(&data->update_lock);
		return count;
		}

		static ssize_t show_pwm(struct device *dev,
		struct device_attribute dev_attr, char buf)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
		}

		static ssize_t set_pwm(struct device *dev,
		struct device_attribute *dev_attr,
		const char *buf, size_t count)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct max6639_data *data = i2c_get_clientdata(client);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
		unsigned long val;
		int res;

		res = strict_strtoul(buf, 10, &val);
		if (res)
		return res;

		val = SENSORS_LIMIT(val, 0, 255);

		mutex_lock(&data->update_lock);
		data->pwm[attr->index] = (u8)(val * 120 / 255);
		i2c_smbus_write_byte_data(client,
		MAX6639_REG_TARGTDUTY(attr->index),
		data->pwm[attr->index]);
		mutex_unlock(&data->update_lock);
		return count;
		}

		static ssize_t show_fan_input(struct device *dev,
		struct device_attribute dev_attr, char buf)
		{
		struct max6639_data *data = max6639_update_device(dev);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		if (IS_ERR(data))
		return PTR_ERR(data);

		return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
		data->ppr, data->rpm_range));
		}

		static ssize_t show_alarm(struct device *dev,
		struct device_attribute dev_attr, char buf)
		{
		struct max6639_data *data = max6639_update_device(dev);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);

		if (IS_ERR(data))
		return PTR_ERR(data);

		return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
		}

		static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
		static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
		static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
		static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
		static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp_max,
		set_temp_max, 0);
		static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_max,
		set_temp_max, 1);
		static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR \| S_IRUGO, show_temp_crit,
		set_temp_crit, 0);
		static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp_crit,
		set_temp_crit, 1);
		static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR \| S_IRUGO,
		show_temp_emergency, set_temp_emergency, 0);
		static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR \| S_IRUGO,
		show_temp_emergency, set_temp_emergency, 1);
		static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR \| S_IRUGO, show_pwm, set_pwm, 0);
		static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR \| S_IRUGO, show_pwm, set_pwm, 1);
		static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
		static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
		static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1);
		static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0);
		static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3);
		static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2);
		static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7);
		static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6);
		static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5);
		static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4);


		static struct attribute *max6639_attributes[] = {
		&sensor_dev_attr_temp1_input.dev_attr.attr,
		&sensor_dev_attr_temp2_input.dev_attr.attr,
		&sensor_dev_attr_temp1_fault.dev_attr.attr,
		&sensor_dev_attr_temp2_fault.dev_attr.attr,
		&sensor_dev_attr_temp1_max.dev_attr.attr,
		&sensor_dev_attr_temp2_max.dev_attr.attr,
		&sensor_dev_attr_temp1_crit.dev_attr.attr,
		&sensor_dev_attr_temp2_crit.dev_attr.attr,
		&sensor_dev_attr_temp1_emergency.dev_attr.attr,
		&sensor_dev_attr_temp2_emergency.dev_attr.attr,
		&sensor_dev_attr_pwm1.dev_attr.attr,
		&sensor_dev_attr_pwm2.dev_attr.attr,
		&sensor_dev_attr_fan1_input.dev_attr.attr,
		&sensor_dev_attr_fan2_input.dev_attr.attr,
		&sensor_dev_attr_fan1_fault.dev_attr.attr,
		&sensor_dev_attr_fan2_fault.dev_attr.attr,
		&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
		&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
		&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
		&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
		NULL
		};

		static const struct attribute_group max6639_group = {
		.attrs = max6639_attributes,
		};

		/*
		* returns respective index in rpm_ranges table
		* 1 by default on invalid range
		*/
		static int rpm_range_to_reg(int range)
		{
		int i;

		for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
		if (rpm_ranges[i] == range)
		return i;
		}

		return 1; /* default: 4000 RPM */
		}

		static int max6639_init_client(struct i2c_client *client)
		{
		struct max6639_data *data = i2c_get_clientdata(client);
		struct max6639_platform_data *max6639_info =
		client->dev.platform_data;
		int i = 0;
		int rpm_range = 1; /* default: 4000 RPM */
		int err = 0;

		/* Reset chip to default values */
		err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
		MAX6639_GCONFIG_POR);
		if (err)
		goto exit;

		/* Fans pulse per revolution is 2 by default */
		if (max6639_info && max6639_info->ppr > 0 &&
		max6639_info->ppr < 5)
		data->ppr = max6639_info->ppr;
		else
		data->ppr = 2;
		data->ppr -= 1;
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_FAN_PPR(i),
		data->ppr << 5);
		if (err)
		goto exit;

		if (max6639_info)
		rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
		data->rpm_range = rpm_range;

		for (i = 0; i < 2; i++) {

		/* Fans config PWM, RPM */
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_FAN_CONFIG1(i),
		MAX6639_FAN_CONFIG1_PWM \| rpm_range);
		if (err)
		goto exit;

		/* Fans PWM polarity high by default */
		if (max6639_info && max6639_info->pwm_polarity == 0)
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_FAN_CONFIG2a(i), 0x00);
		else
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_FAN_CONFIG2a(i), 0x02);
		if (err)
		goto exit;

		/* Max. temp. 80C/90C/100C */
		data->temp_therm[i] = 80;
		data->temp_alert[i] = 90;
		data->temp_ot[i] = 100;
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_THERM_LIMIT(i),
		data->temp_therm[i]);
		if (err)
		goto exit;
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_ALERT_LIMIT(i),
		data->temp_alert[i]);
		if (err)
		goto exit;
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
		if (err)
		goto exit;

		/* PWM 120/120 (i.e. 100%) */
		data->pwm[i] = 120;
		err = i2c_smbus_write_byte_data(client,
		MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
		if (err)
		goto exit;
		}
		/* Start monitoring */
		err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
		MAX6639_GCONFIG_DISABLE_TIMEOUT \| MAX6639_GCONFIG_CH2_LOCAL);
		exit:
		return err;
		}

		/* Return 0 if detection is successful, -ENODEV otherwise */
		static int max6639_detect(struct i2c_client *client,
		struct i2c_board_info *info)
		{
		struct i2c_adapter *adapter = client->adapter;
		int dev_id, manu_id;

		if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

		/* Actual detection via device and manufacturer ID */
		dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
		manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
		if (dev_id != 0x58 \|\| manu_id != 0x4D)
		return -ENODEV;

		strlcpy(info->type, "max6639", I2C_NAME_SIZE);

		return 0;
		}

		static int max6639_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct max6639_data *data;
		int err;

		data = kzalloc(sizeof(struct max6639_data), GFP_KERNEL);
		if (!data) {
		err = -ENOMEM;
		goto exit;
		}

		i2c_set_clientdata(client, data);
		mutex_init(&data->update_lock);

		/* Initialize the max6639 chip */
		err = max6639_init_client(client);
		if (err < 0)
		goto error_free;

		/* Register sysfs hooks */
		err = sysfs_create_group(&client->dev.kobj, &max6639_group);
		if (err)
		goto error_free;

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

		dev_info(&client->dev, "temperature sensor and fan control found\n");

		return 0;

		error_remove:
		sysfs_remove_group(&client->dev.kobj, &max6639_group);
		error_free:
		kfree(data);
		exit:
		return err;
		}

		static int max6639_remove(struct i2c_client *client)
		{
		struct max6639_data *data = i2c_get_clientdata(client);

		hwmon_device_unregister(data->hwmon_dev);
		sysfs_remove_group(&client->dev.kobj, &max6639_group);

		kfree(data);
		return 0;
		}

		static int max6639_suspend(struct i2c_client *client, pm_message_t mesg)
		{
		int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
		if (data < 0)
		return data;

		return i2c_smbus_write_byte_data(client,
		MAX6639_REG_GCONFIG, data \| MAX6639_GCONFIG_STANDBY);
		}

		static int max6639_resume(struct i2c_client *client)
		{
		int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
		if (data < 0)
		return data;

		return i2c_smbus_write_byte_data(client,
		MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
		}

		static const struct i2c_device_id max6639_id[] = {
		{"max6639", 0},
		{ }
		};

		MODULE_DEVICE_TABLE(i2c, max6639_id);

		static struct i2c_driver max6639_driver = {
		.class = I2C_CLASS_HWMON,
		.driver = {
		.name = "max6639",
		},
		.probe = max6639_probe,
		.remove = max6639_remove,
		.suspend = max6639_suspend,
		.resume = max6639_resume,
		.id_table = max6639_id,
		.detect = max6639_detect,
		.address_list = normal_i2c,
		};

		static int __init max6639_init(void)
		{
		return i2c_add_driver(&max6639_driver);
		}

		static void __exit max6639_exit(void)
		{
		i2c_del_driver(&max6639_driver);
		}

		MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
		MODULE_DESCRIPTION("max6639 driver");
		MODULE_LICENSE("GPL");

		module_init(max6639_init);
		module_exit(max6639_exit);

include/linux/i2c/max6639.h

0 → 100644

+14 −0

Original line number	Diff line number	Diff line
		#ifndef _LINUX_MAX6639_H
		#define _LINUX_MAX6639_H

		#include <linux/types.h>

		/* platform data for the MAX6639 temperature sensor and fan control */

		struct max6639_platform_data {
		bool pwm_polarity; /* Polarity low (0) or high (1, default) */
		int ppr; /* Pulses per rotation 1..4 (default == 2) */
		int rpm_range; /* 2000, 4000 (default), 8000 or 16000 */
		};

		#endif /* _LINUX_MAX6639_H */