Signed-off-by: Ben Hutchings <bhutchings at solarflare.com> --- drivers/hwmon/Kconfig | 10 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/max664x.c | 355 +++++++++++++++++++++++++++++++++++++++++++++++ include/linux/max664x.h | 92 ++++++++++++ 4 files changed, 458 insertions(+), 0 deletions(-) create mode 100644 drivers/hwmon/max664x.c create mode 100644 include/linux/max664x.h diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 00ff533..fad29c0 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -512,6 +512,16 @@ config SENSORS_MAX1619 This driver can also be built as a module. If so, the module will be called max1619. +config SENSORS_MAX664X + tristate "Maxim MAX6646/6647/6649 sensor chips" + depends on I2C + help + If you say yes here you get support for MAX6646/6647/6649 + sensor chips. + + This driver can also be built as a module. If so, the module + will be called max664x. + config SENSORS_MAX6650 tristate "Maxim MAX6650 sensor chip" depends on I2C && EXPERIMENTAL diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index d098677..24b907e 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_SENSORS_LM90) += lm90.o obj-$(CONFIG_SENSORS_LM92) += lm92.o obj-$(CONFIG_SENSORS_LM93) += lm93.o obj-$(CONFIG_SENSORS_MAX1619) += max1619.o +obj-$(CONFIG_SENSORS_MAX664X) += max664x.o obj-$(CONFIG_SENSORS_MAX6650) += max6650.o obj-$(CONFIG_SENSORS_PC87360) += pc87360.o obj-$(CONFIG_SENSORS_PC87427) += pc87427.o diff --git a/drivers/hwmon/max664x.c b/drivers/hwmon/max664x.c new file mode 100644 index 0000000..c5cd365 --- /dev/null +++ b/drivers/hwmon/max664x.c @@ -0,0 +1,355 @@ +/**************************************************************************** + * Driver for Maxim MAX6646/6647/6649 sensor chips + * Copyright 2008 Solarflare Communications Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation, incorporated herein by reference. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/max664x.h> + +/* Data sheet: <http://datasheets.maxim-ic.com/en/ds/MAX6646-MAX6649.pdf> */ + +#define MAX664X_REG_RLTS 0x00 +#define MAX664X_REG_RRTE 0x01 +#define MAX664X_REG_RSL 0x02 +#define MAX664X_REG_RCL 0x03 +#define MAX664X_REG_RCRA 0x04 +#define MAX664X_REG_RLHN 0x05 +#define MAX664X_REG_RLLI 0x06 +#define MAX664X_REG_RRHI 0x07 +#define MAX664X_REG_RRLS 0x08 +#define MAX664X_REG_WCA 0x09 +#define MAX664X_REG_WCRW 0x0a +#define MAX664X_REG_WLHO 0x0b +#define MAX664X_REG_WLLM 0x0c +#define MAX664X_REG_WRHA 0x0d +#define MAX664X_REG_WRLN 0x0e +#define MAX664X_REG_OSHT 0x0f +#define MAX664X_REG_REET 0x10 +#define MAX664X_REG_RIET 0x11 +#define MAX664X_REG_RWOE 0x19 +#define MAX664X_REG_RWOI 0x20 +#define MAX664X_REG_HYS 0x21 +#define MAX664X_REG_QUEUE 0x22 +#define MAX664X_REG_MFID 0xfe +#define MAX664X_REG_REVID 0xff + +struct max664x_data { + struct device *hwmon_dev; + struct mutex update_lock; + int valid; + unsigned long last_updated; /* in jiffies */ + struct max664x_settings set; + struct max664x_values val; +}; + +#define TEMP_FROM_REG(val) ((val) * 1000) +#define TEMP_TO_REG(val) ((val) / 1000) +#define PERIOD_FROM_RATE_REG(val) (16000 >> min_t(int, val, 6)) +#define PERIOD_TO_RATE_REG(val) SENSORS_LIMIT(7 - ffs(val / 250), 0, 6) + +static struct max664x_data *max664x_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct max664x_data *data = i2c_get_clientdata(client); + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { + data->set.rate = + i2c_smbus_read_byte_data(client, MAX664X_REG_RCRA); + data->val.temp[0] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RLTS); + data->set.temp_overt[0] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RWOI); + data->set.temp_high_alert[0] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RLHN); + data->set.temp_low_alert[0] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RLLI); + data->val.temp[1] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RRTE); + data->set.temp_overt[1] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RWOE); + data->set.temp_high_alert[1] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RRHI); + data->set.temp_low_alert[1] = + i2c_smbus_read_byte_data(client, MAX664X_REG_RRLS); + data->set.temp_overt_hyst = + i2c_smbus_read_byte_data(client, MAX664X_REG_HYS); + + data->last_updated = jiffies; + data->valid = 1; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +struct max664x_values *max664x_update_values(struct i2c_client *client) +{ + struct max664x_data *data = max664x_update_device(&client->dev); + return &data->val; +} +EXPORT_SYMBOL(max664x_update_values); + +static void +set_temp_limit(struct device *dev, const char *buf, int offset, int reg) +{ + struct i2c_client *client = to_i2c_client(dev); + struct max664x_data *data = i2c_get_clientdata(client); + long val = simple_strtol(buf, NULL, 10); + u8 reg_val = TEMP_TO_REG(val); + + mutex_lock(&data->update_lock); + ((u8 *)&data->set)[offset] = reg_val; + i2c_smbus_write_byte_data(client, reg, reg_val); + mutex_unlock(&data->update_lock); +} + +#define TEMP_LIMIT_ATTR(offset, limit, array_name, reg_name) \ + static ssize_t \ + show_temp##offset##_##limit(struct device *dev, \ + struct device_attribute *attr, char *buf) \ + { \ + struct max664x_data *data = max664x_update_device(dev); \ + return sprintf(buf, "%u\n", \ + TEMP_FROM_REG(data->set.array_name[offset - 1])); \ + } \ + static ssize_t \ + set_temp##offset##_##limit(struct device *dev, \ + struct device_attribute *attr, \ + const char *buf, size_t count) \ + { \ + set_temp_limit(dev, buf, \ + offsetof(struct max664x_settings, \ + array_name[offset - 1]), \ + MAX664X_REG_##reg_name); \ + return count; \ + } \ + static DEVICE_ATTR(temp##offset##_##limit, S_IRUGO | S_IWUSR, \ + show_temp##offset##_##limit, \ + set_temp##offset##_##limit); + +static ssize_t show_temp_crit_hyst(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct max664x_data *data = max664x_update_device(dev); + return sprintf(buf, "%u\n", TEMP_FROM_REG(data->set.temp_overt_hyst)); +} + +static ssize_t +set_temp_crit_hyst(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct max664x_data *data = i2c_get_clientdata(client); + long val = simple_strtol(buf, NULL, 10); + u8 reg_val = TEMP_TO_REG(val); + + mutex_lock(&data->update_lock); + data->set.temp_overt_hyst = reg_val; + i2c_smbus_write_byte_data(client, MAX664X_REG_HYS, reg_val); + mutex_unlock(&data->update_lock); + return count; +} + +#define TEMP_ATTRS(offset, overt_reg, high_alert_reg, low_alert_reg) \ + static ssize_t \ + show_temp##offset##_input(struct device *dev, \ + struct device_attribute *attr, char *buf) \ + { \ + struct max664x_data *data = max664x_update_device(dev); \ + return sprintf(buf, "%u\n", \ + TEMP_FROM_REG(data->val.temp[offset - 1])); \ + } \ + static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ + show_temp##offset##_input, NULL); \ + TEMP_LIMIT_ATTR(offset, crit, temp_overt, overt_reg) \ + static DEVICE_ATTR(temp##offset##_crit_hyst, S_IRUGO, \ + show_temp_crit_hyst, set_temp_crit_hyst); \ + TEMP_LIMIT_ATTR(offset, max, temp_high_alert, high_alert_reg) \ + TEMP_LIMIT_ATTR(offset, min, temp_low_alert, low_alert_reg) + +TEMP_ATTRS(1, RWOI, WLHO, WLLM) +TEMP_ATTRS(2, RWOE, WRHA, WRLN) + +static ssize_t +show_period(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct max664x_data *data = max664x_update_device(dev); + return sprintf(buf, "%u\n", PERIOD_FROM_RATE_REG(data->set.rate)); +} +static ssize_t set_period(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct max664x_data *data = i2c_get_clientdata(client); + long val = simple_strtol(buf, NULL, 10); + u8 reg_val = PERIOD_TO_RATE_REG(val); + + mutex_lock(&data->update_lock); + data->set.rate = reg_val; + i2c_smbus_write_byte_data(client, MAX664X_REG_WCRW, reg_val); + mutex_unlock(&data->update_lock); + return count; +} +static DEVICE_ATTR(period, S_IRUGO | S_IWUSR, show_period, set_period); + +/* + * Status is read-to-clear, so it is not world-readable and is not + * updated with the other fields. + */ +static ssize_t show_status(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + int val = i2c_smbus_read_byte_data(client, MAX664X_REG_RSL); + return val >= 0 ? sprintf(buf, "0x%x\n", val) : val; +} +static DEVICE_ATTR(status, S_IRUSR, show_status, NULL); + +int max664x_read_status(struct i2c_client *client) +{ + return i2c_smbus_read_byte_data(client, MAX664X_REG_RSL); +} +EXPORT_SYMBOL(max664x_read_status); + +static struct attribute *max664x_attributes[] = { + &dev_attr_temp1_input.attr, + &dev_attr_temp1_crit.attr, + &dev_attr_temp1_crit_hyst.attr, + &dev_attr_temp1_max.attr, + &dev_attr_temp1_min.attr, + &dev_attr_temp2_input.attr, + &dev_attr_temp2_crit.attr, + &dev_attr_temp2_crit_hyst.attr, + &dev_attr_temp2_max.attr, + &dev_attr_temp2_min.attr, + + &dev_attr_period.attr, + &dev_attr_status.attr, + + NULL +}; + +static const struct attribute_group max664x_group = { + .attrs = max664x_attributes, +}; + +static int +max664x_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + const struct max664x_platform_data *plat_data = + client->dev.platform_data; + struct max664x_data *data; + int err; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->valid = 0; + mutex_init(&data->update_lock); + if (plat_data) + data->set = plat_data->set; + i2c_set_clientdata(client, data); + + if (plat_data && plat_data->set_rate) + i2c_smbus_write_byte_data(client, MAX664X_REG_WCRW, + data->set.rate); + if (plat_data && plat_data->set_limits) { + i2c_smbus_write_byte_data(client, MAX664X_REG_RWOI, + data->set.temp_overt[0]); + i2c_smbus_write_byte_data(client, MAX664X_REG_WLHO, + data->set.temp_high_alert[0]); + i2c_smbus_write_byte_data(client, MAX664X_REG_WLLM, + data->set.temp_low_alert[0]); + i2c_smbus_write_byte_data(client, MAX664X_REG_RWOE, + data->set.temp_overt[1]); + i2c_smbus_write_byte_data(client, MAX664X_REG_WRHA, + data->set.temp_high_alert[1]); + i2c_smbus_write_byte_data(client, MAX664X_REG_WRLN, + data->set.temp_low_alert[1]); + i2c_smbus_write_byte_data(client, MAX664X_REG_HYS, + data->set.temp_overt_hyst); + } + + err = sysfs_create_group(&client->dev.kobj, &max664x_group); + if (err) + goto exit_free; + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove; + } + + return 0; + +exit_remove: + sysfs_remove_group(&client->dev.kobj, &max664x_group); +exit_free: + kfree(data); + i2c_set_clientdata(client, NULL); + return err; +} + +static int max664x_remove(struct i2c_client *client) +{ + struct max664x_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &max664x_group); + + kfree(data); + i2c_set_clientdata(client, NULL); + return 0; +} + +static const struct i2c_device_id max664x_id[] = { + { "max6646" }, + { "max6647" }, + { "max6649" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max664x_id); + +struct i2c_driver max664x_driver = { + .driver = { + .name = "max664x", + }, + .probe = max664x_probe, + .remove = max664x_remove, + .id_table = max664x_id, +}; + +static int __init max664x_init(void) +{ + return i2c_add_driver(&max664x_driver); +} + +static void __exit max664x_exit(void) +{ + i2c_del_driver(&max664x_driver); +} + +MODULE_AUTHOR("Solarflare Communications"); +MODULE_DESCRIPTION("MAX6646/6647/6649 driver"); +MODULE_LICENSE("GPL v2"); + +module_init(max664x_init); +module_exit(max664x_exit); diff --git a/include/linux/max664x.h b/include/linux/max664x.h new file mode 100644 index 0000000..0b05903 --- /dev/null +++ b/include/linux/max664x.h @@ -0,0 +1,92 @@ +/**************************************************************************** + * Interface to max664x driver + * Copyright 2008 Solarflare Communications Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation, incorporated herein by reference. + */ + +#ifndef _MAX664X_H_ +#define _MAX664X_H_ + +#ifdef __KERNEL__ + +#include <linux/types.h> +#include <linux/i2c.h> + +/* Status register */ +#define MAX664X_STATUS_IOT (1 << 0) +#define MAX664X_STATUS_EOT (1 << 1) +#define MAX664X_STATUS_FAULT (1 << 2) +#define MAX664X_STATUS_RLOW (1 << 3) +#define MAX664X_STATUS_RHIGH (1 << 4) +#define MAX664X_STATUS_LLOW (1 << 5) +#define MAX664X_STATUS_LHIGH (1 << 6) +#define MAX664X_STATUS_BUSY (1 << 7) + +#define MAX664X_TEMP_INT 0 +#define MAX664X_TEMP_EXT 1 + +/** + * struct max664x_settings - settings for MAX6646/6647/6649 hardware monitor + * @rate: Conversion rate setting + * @temp_overt: High temperature to set OVERT + * @temp_high_alert: High temperature to set ALERT + * @temp_low_alert: Low temperature to set ALERT + * @temp_overt_hyst: Hysteresis for resetting OVERT + * + * All values are raw register values. + */ +struct max664x_settings { + u8 rate; + u8 temp_overt[2]; + u8 temp_high_alert[2]; + u8 temp_low_alert[2]; + u8 temp_overt_hyst; +}; + +/** + * struct max664x_values - values from MAX6646/6647/6649 hardware monitor + * @temp: Current temperature + * + * All values are raw register values. + */ +struct max664x_values { + u8 temp[2]; +}; + +/** + * struct max664x_platform_data - platform data for MAX6646/6647/6649 hardware monitor + * @set_rate: Flag for whether to set rate register + * @set_limits: Flag for whether to set limit registers + * @set: Settings to be applied depending on the above flags + * + * This platform data is optional. If not provided, the driver will + * assume that the MAX6646/6647/6649 was properly configured by firmware + * or the power-on-reset defaults. + */ +struct max664x_platform_data { + unsigned set_rate : 1; + unsigned set_limits : 1; + struct max664x_settings set; +}; + +/** + * max664x_update_values() - update and return current values + * @client: I2C client to which the max664x driver is bound + */ +struct max664x_values *max664x_update_values(struct i2c_client *client); + +/** + * max664x_read_status() - read status register + * @client: I2C client to which the max664x driver is bound + * + * Read the status register, which automatically clears any stuck alarm + * bits. + */ +int max664x_read_status(struct i2c_client *client); + +#endif + +#endif -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job.
