hwmon: New AD7416, AD7417 and AD7418 driver (2d8dd65f) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/hwmon/Kconfig

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Original line number	Diff line number	Diff line
		@@ -39,6 +39,16 @@ config SENSORS_ABITUGURU
		This driver can also be built as a module. If so, the module
		will be called abituguru.

		config SENSORS_AD7418
		tristate "Analog Devices AD7416, AD7417 and AD7418"
		depends on HWMON && I2C && EXPERIMENTAL
		help
		If you say yes here you get support for the Analog Devices
		AD7416, AD7417 and AD7418 temperature monitoring chips.

		This driver can also be built as a module. If so, the module
		will be called ad7418.

		config SENSORS_ADM1021
		tristate "Analog Devices ADM1021 and compatibles"
		depends on HWMON && I2C

drivers/hwmon/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@ obj-$(CONFIG_SENSORS_W83781D) += w83781d.o
		obj-$(CONFIG_SENSORS_W83791D) += w83791d.o

		obj-$(CONFIG_SENSORS_ABITUGURU) += abituguru.o
		obj-$(CONFIG_SENSORS_AD7418) += ad7418.o
		obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o
		obj-$(CONFIG_SENSORS_ADM1025) += adm1025.o
		obj-$(CONFIG_SENSORS_ADM1026) += adm1026.o

drivers/hwmon/ad7418.c

0 → 100644

+373 −0

Original line number	Diff line number	Diff line
		/*
		* An hwmon driver for the Analog Devices AD7416/17/18
		* Copyright (C) 2006-07 Tower Technologies
		*
		* Author: Alessandro Zummo <a.zummo@towertech.it>
		*
		* Based on lm75.c
		* Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
		*
		* 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 - version 2.
		*/

		#include <linux/module.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/delay.h>

		#include "lm75.h"

		#define DRV_VERSION "0.3"

		/* Addresses to scan */
		static unsigned short normal_i2c[] = { 0x28, I2C_CLIENT_END };
		/* Insmod parameters */
		I2C_CLIENT_INSMOD_3(ad7416, ad7417, ad7418);

		/* AD7418 registers */
		#define AD7418_REG_TEMP_IN 0x00
		#define AD7418_REG_CONF 0x01
		#define AD7418_REG_TEMP_HYST 0x02
		#define AD7418_REG_TEMP_OS 0x03
		#define AD7418_REG_ADC 0x04
		#define AD7418_REG_CONF2 0x05

		#define AD7418_REG_ADC_CH(x) ((x) << 5)
		#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)

		static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
		AD7418_REG_TEMP_HYST,
		AD7418_REG_TEMP_OS };

		struct ad7418_data {
		struct i2c_client client;
		struct class_device *class_dev;
		struct attribute_group attrs;
		enum chips type;
		struct mutex lock;
		int adc_max; /* number of ADC channels */
		char valid;
		unsigned long last_updated; /* In jiffies */
		s16 temp[3]; /* Register values */
		u16 in[4];
		};

		static int ad7418_attach_adapter(struct i2c_adapter *adapter);
		static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind);
		static int ad7418_detach_client(struct i2c_client *client);

		static struct i2c_driver ad7418_driver = {
		.driver = {
		.name = "ad7418",
		},
		.attach_adapter = ad7418_attach_adapter,
		.detach_client = ad7418_detach_client,
		};

		/* All registers are word-sized, except for the configuration registers.
		* AD7418 uses a high-byte first convention. Do NOT use those functions to
		* access the configuration registers CONF and CONF2, as they are byte-sized.
		*/
		static inline int ad7418_read(struct i2c_client *client, u8 reg)
		{
		return swab16(i2c_smbus_read_word_data(client, reg));
		}

		static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value)
		{
		return i2c_smbus_write_word_data(client, reg, swab16(value));
		}

		static void ad7418_init_client(struct i2c_client *client)
		{
		struct ad7418_data *data = i2c_get_clientdata(client);

		int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
		if (reg < 0) {
		dev_err(&client->dev, "cannot read configuration register\n");
		} else {
		dev_info(&client->dev, "configuring for mode 1\n");
		i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);

		if (data->type == ad7417 \|\| data->type == ad7418)
		i2c_smbus_write_byte_data(client,
		AD7418_REG_CONF2, 0x00);
		}
		}

		static struct ad7418_data ad7418_update_device(struct device dev)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct ad7418_data *data = i2c_get_clientdata(client);

		mutex_lock(&data->lock);

		if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
		\|\| !data->valid) {
		u8 cfg;
		int i, ch;

		/* read config register and clear channel bits */
		cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
		cfg &= 0x1F;

		i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
		cfg \| AD7418_CH_TEMP);
		udelay(30);

		for (i = 0; i < 3; i++) {
		data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]);
		}

		for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
		i2c_smbus_write_byte_data(client,
		AD7418_REG_CONF,
		cfg \| AD7418_REG_ADC_CH(ch));

		udelay(15);
		data->in[data->adc_max - 1 - i] =
		ad7418_read(client, AD7418_REG_ADC);
		}

		/* restore old configuration value */
		ad7418_write(client, AD7418_REG_CONF, cfg);

		data->last_updated = jiffies;
		data->valid = 1;
		}

		mutex_unlock(&data->lock);

		return data;
		}

		static ssize_t show_temp(struct device dev, struct device_attribute devattr,
		char *buf)
		{
		struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
		struct ad7418_data *data = ad7418_update_device(dev);
		return sprintf(buf, "%d\n",
		LM75_TEMP_FROM_REG(data->temp[attr->index]));
		}

		static ssize_t show_adc(struct device dev, struct device_attribute devattr,
		char *buf)
		{
		struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
		struct ad7418_data *data = ad7418_update_device(dev);

		return sprintf(buf, "%d\n",
		((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
		}

		static ssize_t set_temp(struct device dev, struct device_attribute devattr,
		const char *buf, size_t count)
		{
		struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
		struct i2c_client *client = to_i2c_client(dev);
		struct ad7418_data *data = i2c_get_clientdata(client);
		int temp = simple_strtol(buf, NULL, 10);

		mutex_lock(&data->lock);
		data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
		ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]);
		mutex_unlock(&data->lock);
		return count;
		}

		static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
		static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
		show_temp, set_temp, 1);
		static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
		show_temp, set_temp, 2);

		static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
		static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
		static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
		static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);

		static int ad7418_attach_adapter(struct i2c_adapter *adapter)
		{
		if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
		return i2c_probe(adapter, &addr_data, ad7418_detect);
		}

		static struct attribute *ad7416_attributes[] = {
		&sensor_dev_attr_temp1_max.dev_attr.attr,
		&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
		&sensor_dev_attr_temp1_input.dev_attr.attr,
		NULL
		};

		static struct attribute *ad7417_attributes[] = {
		&sensor_dev_attr_temp1_max.dev_attr.attr,
		&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
		&sensor_dev_attr_temp1_input.dev_attr.attr,
		&sensor_dev_attr_in1_input.dev_attr.attr,
		&sensor_dev_attr_in2_input.dev_attr.attr,
		&sensor_dev_attr_in3_input.dev_attr.attr,
		&sensor_dev_attr_in4_input.dev_attr.attr,
		NULL
		};

		static struct attribute *ad7418_attributes[] = {
		&sensor_dev_attr_temp1_max.dev_attr.attr,
		&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
		&sensor_dev_attr_temp1_input.dev_attr.attr,
		&sensor_dev_attr_in1_input.dev_attr.attr,
		NULL
		};

		static int ad7418_detect(struct i2c_adapter *adapter, int address, int kind)
		{
		struct i2c_client *client;
		struct ad7418_data *data;
		int err = 0;

		if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
		I2C_FUNC_SMBUS_WORD_DATA))
		goto exit;

		if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
		}

		client = &data->client;
		client->addr = address;
		client->adapter = adapter;
		client->driver = &ad7418_driver;

		i2c_set_clientdata(client, data);

		mutex_init(&data->lock);

		/* AD7418 has a curious behaviour on registers 6 and 7. They
		* both always read 0xC071 and are not documented on the datasheet.
		* We use them to detect the chip.
		*/
		if (kind <= 0) {
		int reg, reg6, reg7;

		/* the AD7416 lies within this address range, but I have
		* no means to check.
		*/
		if (address >= 0x48 && address <= 0x4f) {
		/* XXX add tests for AD7416 here */
		/* data->type = ad7416; */
		}
		/* here we might have AD7417 or AD7418 */
		else if (address >= 0x28 && address <= 0x2f) {
		reg6 = i2c_smbus_read_word_data(client, 0x06);
		reg7 = i2c_smbus_read_word_data(client, 0x07);

		if (address == 0x28 && reg6 == 0xC071 && reg7 == 0xC071)
		data->type = ad7418;

		/* XXX add tests for AD7417 here */


		/* both AD7417 and AD7418 have bits 0-5 of
		* the CONF2 register at 0
		*/
		reg = i2c_smbus_read_byte_data(client,
		AD7418_REG_CONF2);
		if (reg & 0x3F)
		data->type = any_chip; /* detection failed */
		}
		} else {
		dev_dbg(&adapter->dev, "detection forced\n");
		}

		if (kind > 0)
		data->type = kind;
		else if (kind < 0 && data->type == any_chip) {
		err = -ENODEV;
		goto exit_free;
		}

		switch (data->type) {
		case any_chip:
		case ad7416:
		data->adc_max = 0;
		data->attrs.attrs = ad7416_attributes;
		strlcpy(client->name, "ad7416", I2C_NAME_SIZE);
		break;

		case ad7417:
		data->adc_max = 4;
		data->attrs.attrs = ad7417_attributes;
		strlcpy(client->name, "ad7417", I2C_NAME_SIZE);
		break;

		case ad7418:
		data->adc_max = 1;
		data->attrs.attrs = ad7418_attributes;
		strlcpy(client->name, "ad7418", I2C_NAME_SIZE);
		break;
		}

		if ((err = i2c_attach_client(client)))
		goto exit_free;

		dev_info(&client->dev, "%s chip found\n", client->name);

		/* Initialize the AD7418 chip */
		ad7418_init_client(client);

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

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

		return 0;

		exit_remove:
		sysfs_remove_group(&client->dev.kobj, &data->attrs);
		exit_detach:
		i2c_detach_client(client);
		exit_free:
		kfree(data);
		exit:
		return err;
		}

		static int ad7418_detach_client(struct i2c_client *client)
		{
		struct ad7418_data *data = i2c_get_clientdata(client);
		hwmon_device_unregister(data->class_dev);
		sysfs_remove_group(&client->dev.kobj, &data->attrs);
		i2c_detach_client(client);
		kfree(data);
		return 0;
		}

		static int __init ad7418_init(void)
		{
		return i2c_add_driver(&ad7418_driver);
		}

		static void __exit ad7418_exit(void)
		{
		i2c_del_driver(&ad7418_driver);
		}

		MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
		MODULE_DESCRIPTION("AD7416/17/18 driver");
		MODULE_LICENSE("GPL");
		MODULE_VERSION(DRV_VERSION);

		module_init(ad7418_init);
		module_exit(ad7418_exit);