This patch add support for AD7417 and AD7418 chips.
Signed-off-by: Alessandro Zummo <a.zummo at towertech.it>
---
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1
drivers/hwmon/ad7418.c | 353 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 364 insertions(+)
--- linux-ixp4xx.orig/drivers/hwmon/Makefile 2006-10-19 13:40:47.000000000 +0200
+++ linux-ixp4xx/drivers/hwmon/Makefile 2006-10-19 13:44:08.000000000 +0200
@@ -50,6 +50,7 @@ obj-$(CONFIG_SENSORS_VT1211) += vt1211.o
obj-$(CONFIG_SENSORS_VT8231) += vt8231.o
obj-$(CONFIG_SENSORS_W83627EHF) += w83627ehf.o
obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o
+obj-$(CONFIG_SENSORS_AD7418) += ad7418.o
ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
EXTRA_CFLAGS += -DDEBUG
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-ixp4xx/drivers/hwmon/ad7418.c 2006-10-19 13:55:17.000000000 +0200
@@ -0,0 +1,353 @@
+/*
+ * An hwmon driver for the Analog Devices AD7417/18
+ * Copyright 2006 Tower Technologies
+ *
+ * Author: Alessandro Zummo <a.zummo at towertech.it>
+ *
+ * Based on lm75.c
+ * Copyright 1998-99 Frodo Looijaard <frodol at 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; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+#define DRV_VERSION "0.2"
+
+/* straight from the datasheet */
+#define AD7418_TEMP_MIN (-55000)
+#define AD7418_TEMP_MAX 125000
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2A, 0x2B, 0x2C,
+ 0x2D, 0x2E, 0x2F, I2C_CLIENT_END };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD;
+
+/* AD7418 registers */
+#define AD7418_REG_TEMP 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)
+#define AD7418_CH_AIN1 AD7418_REG_ADC_CH(1)
+#define AD7418_CH_AIN2 AD7418_REG_ADC_CH(2)
+#define AD7418_CH_AIN3 AD7418_REG_ADC_CH(3)
+#define AD7418_CH_AIN4 AD7418_REG_ADC_CH(4)
+
+struct ad7418_data {
+ struct i2c_client client;
+ struct class_device *class_dev;
+ struct mutex lock;
+ char valid; /* !=0 if following fields are valid */
+ unsigned long last_updated; /* In jiffies */
+ u16 temp_input; /* Register values */
+ u16 temp_max;
+ u16 temp_hyst;
+ u16 in1;
+ u16 in2;
+ u16 in3;
+ u16 in4;
+};
+
+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,
+};
+
+/* TEMP: 0.001C/bit (-55C to +125C)
+ * REG: (0.5C/bit, two's complement) << 7
+ */
+static inline u16 AD7418_TEMP_TO_REG(int temp)
+{
+ int ntemp = SENSORS_LIMIT(temp, AD7418_TEMP_MIN, AD7418_TEMP_MAX);
+ ntemp += (ntemp < 0 ? -250 : 250);
+ return (u16)((ntemp / 500) << 7);
+}
+
+static inline int AD7418_TEMP_FROM_REG(u16 reg)
+{
+ /* use integer division instead of equivalent right shift to
+ * guarantee arithmetic shift and preserve the sign
+ */
+ return ((s16)reg / 128) * 500;
+}
+
+/* All registers are word-sized, except for the configuration registers.
+ * AD7418 uses a high-byte first convention, which is exactly opposite to
+ * the usual practice.
+ */
+static int ad7418_read(struct i2c_client *client, u8 reg)
+{
+ if (reg == AD7418_REG_CONF || reg == AD7418_REG_CONF2)
+ return i2c_smbus_read_byte_data(client, reg);
+ else
+ return swab16(i2c_smbus_read_word_data(client, reg));
+}
+
+static int ad7418_write(struct i2c_client *client, u8 reg, u16 value)
+{
+ if (reg == AD7418_REG_CONF || reg == AD7418_REG_CONF2)
+ return i2c_smbus_write_byte_data(client, reg, value);
+ else
+ return i2c_smbus_write_word_data(client, reg, swab16(value));
+}
+
+static void ad7418_init_client(struct i2c_client *client)
+{
+ /* Enable if in shutdown mode */
+ int reg = ad7418_read(client, AD7418_REG_CONF);
+ if (reg >= 0 && (reg & 0x01))
+ ad7418_write(client, AD7418_REG_CONF, reg & 0xfe);
+}
+
+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;
+ dev_dbg(&client->dev, "starting ad7418 update\n");
+
+ data->temp_input = ad7418_read(client, AD7418_REG_TEMP);
+ data->temp_max = ad7418_read(client, AD7418_REG_TEMP_OS);
+ data->temp_hyst = ad7418_read(client, AD7418_REG_TEMP_HYST);
+
+ /* read config register and clear channel bits */
+ cfg = ad7418_read(client, AD7418_REG_CONF);
+ cfg &= 0x1F;
+
+ ad7418_write(client, AD7418_REG_CONF, cfg | AD7418_CH_AIN1);
+ data->in1 = ad7418_read(client, AD7418_REG_ADC);
+
+ ad7418_write(client, AD7418_REG_CONF, cfg | AD7418_CH_AIN2);
+ data->in2 = ad7418_read(client, AD7418_REG_ADC);
+
+ ad7418_write(client, AD7418_REG_CONF, cfg | AD7418_CH_AIN3);
+ data->in3 = ad7418_read(client, AD7418_REG_ADC);
+
+ ad7418_write(client, AD7418_REG_CONF, cfg | AD7418_CH_AIN4);
+ data->in4 = 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;
+}
+
+#define show(value) \
+static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ struct ad7418_data *data = ad7418_update_device(dev); \
+ return sprintf(buf, "%d\n", AD7418_TEMP_FROM_REG(data->value)); \
+}
+show(temp_max);
+show(temp_hyst);
+show(temp_input);
+
+#define show_adc(value) \
+static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ struct ad7418_data *data = ad7418_update_device(dev); \
+ return sprintf(buf, "%d\n", data->value >> 6); \
+}
+
+show_adc(in1);
+show_adc(in2);
+show_adc(in3);
+show_adc(in4);
+
+#define set(value, reg) \
+static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
+{ \
+ struct i2c_client *client = to_i2c_client(dev); \
+ struct ad7418_data *data = i2c_get_clientdata(client); \
+ int temp = simple_strtoul(buf, NULL, 10); \
+ \
+ mutex_lock(&data->lock); \
+ data->value = AD7418_TEMP_TO_REG(temp); \
+ ad7418_write(client, reg, data->value); \
+ mutex_unlock(&data->lock); \
+ return count; \
+}
+set(temp_max, AD7418_REG_TEMP_OS);
+set(temp_hyst, AD7418_REG_TEMP_HYST);
+
+static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
+static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
+static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
+
+static DEVICE_ATTR(in1, S_IRUGO, show_in1, NULL);
+static DEVICE_ATTR(in2, S_IRUGO, show_in2, NULL);
+static DEVICE_ATTR(in3, S_IRUGO, show_in3, NULL);
+static DEVICE_ATTR(in4, S_IRUGO, show_in4, NULL);
+
+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 *ad7418_attributes[] = {
+ &dev_attr_temp1_max.attr,
+ &dev_attr_temp1_max_hyst.attr,
+ &dev_attr_temp1_input.attr,
+ &dev_attr_in1.attr,
+ &dev_attr_in2.attr,
+ &dev_attr_in3.attr,
+ &dev_attr_in4.attr,
+ NULL
+};
+
+static const struct attribute_group ad7418_group = {
+ .attrs = ad7418_attributes,
+};
+
+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;
+ client->flags = 0;
+
+ 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;
+
+ reg = i2c_smbus_read_word_data(client, 0x06);
+ if (reg != 0xC071) {
+ dev_dbg(&adapter->dev, "failed detection at %d: %x\n", 6, reg);
+ err = -ENODEV;
+ goto exit_free;
+ }
+
+ reg = i2c_smbus_read_word_data(client, 0x07);
+ if (reg != 0xC071) {
+ dev_dbg(&adapter->dev, "failed detection at %d: %x\n", 7, reg);
+ err = -ENODEV;
+ goto exit_free;
+ }
+
+ reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF2);
+
+ /* bits 0-5 must be at 0 */
+ if (reg & 0x3F) {
+ dev_dbg(&adapter->dev, "failed detection at %d: %x\n",
+ AD7418_REG_CONF2, reg);
+ err = -ENODEV;
+ goto exit_free;
+ }
+ }
+
+ strlcpy(client->name, ad7418_driver.driver.name, I2C_NAME_SIZE);
+
+ if ((err = i2c_attach_client(client)))
+ goto exit_free;
+
+ dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
+
+ /* Initialize the AD7418 chip */
+ ad7418_init_client(client);
+
+ /* Register sysfs hooks */
+ if ((err = sysfs_create_group(&client->dev.kobj, &ad7418_group)))
+ 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, &ad7418_group);
+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, &ad7418_group);
+ 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 at towertech.it>");
+MODULE_DESCRIPTION("AD7417/8 driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(ad7418_init);
+module_exit(ad7418_exit);
--- linux-ixp4xx.orig/drivers/hwmon/Kconfig 2006-10-19 13:40:47.000000000 +0200
+++ linux-ixp4xx/drivers/hwmon/Kconfig 2006-10-19 13:44:08.000000000 +0200
@@ -512,6 +512,16 @@ config SENSORS_W83627EHF
This driver can also be built as a module. If so, the module
will be called w83627ehf.
+config SENSORS_AD7418
+ tristate "Analog Devices AD7417/18"
+ depends on HWMON && I2C && EXPERIMENTAL
+ help
+ If you say yes here you get support for the Analog Devices AD7417
+ and AD7418 chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called ad7418.
+
config SENSORS_HDAPS
tristate "IBM Hard Drive Active Protection System (hdaps)"
depends on HWMON && INPUT && X86
