+++ /dev/null
-Kernel driver adm1021
-=====================
-
-Supported chips:
-
- * Analog Devices ADM1021
-
- Prefix: 'adm1021'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the Analog Devices website
-
- * Analog Devices ADM1021A/ADM1023
-
- Prefix: 'adm1023'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the Analog Devices website
-
- * Genesys Logic GL523SM
-
- Prefix: 'gl523sm'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet:
-
- * Maxim MAX1617
-
- Prefix: 'max1617'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the Maxim website
-
- * Maxim MAX1617A
-
- Prefix: 'max1617a'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the Maxim website
-
- * National Semiconductor LM84
-
- Prefix: 'lm84'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the National Semiconductor website
-
- * Philips NE1617
-
- Prefix: 'max1617' (probably detected as a max1617)
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the Philips website
-
- * Philips NE1617A
-
- Prefix: 'max1617' (probably detected as a max1617)
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the Philips website
-
- * TI THMC10
-
- Prefix: 'thmc10'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the TI website
-
- * Onsemi MC1066
-
- Prefix: 'mc1066'
-
- Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
-
- Datasheet: Publicly available at the Onsemi website
-
-
-Authors:
- - Frodo Looijaard <frodol@dds.nl>,
- - Philip Edelbrock <phil@netroedge.com>
-
-Module Parameters
------------------
-
-* read_only: int
- Don't set any values, read only mode
-
-
-Description
------------
-
-The chips supported by this driver are very similar. The Maxim MAX1617 is
-the oldest; it has the problem that it is not very well detectable. The
-MAX1617A solves that. The ADM1021 is a straight clone of the MAX1617A.
-Ditto for the THMC10. From here on, we will refer to all these chips as
-ADM1021-clones.
-
-The ADM1021 and MAX1617A reports a die code, which is a sort of revision
-code. This can help us pinpoint problems; it is not very useful
-otherwise.
-
-ADM1021-clones implement two temperature sensors. One of them is internal,
-and measures the temperature of the chip itself; the other is external and
-is realised in the form of a transistor-like device. A special alarm
-indicates whether the remote sensor is connected.
-
-Each sensor has its own low and high limits. When they are crossed, the
-corresponding alarm is set and remains on as long as the temperature stays
-out of range. Temperatures are measured in degrees Celsius. Measurements
-are possible between -65 and +127 degrees, with a resolution of one degree.
-
-If an alarm triggers, it will remain triggered until the hardware register
-is read at least once. This means that the cause for the alarm may already
-have disappeared!
-
-This driver only updates its values each 1.5 seconds; reading it more often
-will do no harm, but will return 'old' values. It is possible to make
-ADM1021-clones do faster measurements, but there is really no good reason
-for that.
-
-
-Netburst-based Xeon support
----------------------------
-
-Some Xeon processors based on the Netburst (early Pentium 4, from 2001 to
-2003) microarchitecture had real MAX1617, ADM1021, or compatible chips
-within them, with two temperature sensors. Other Xeon processors of this
-era (with 400 MHz FSB) had chips with only one temperature sensor.
-
-If you have such an old Xeon, and you get two valid temperatures when
-loading the adm1021 module, then things are good.
-
-If nothing happens when loading the adm1021 module, and you are certain
-that your specific Xeon processor model includes compatible sensors, you
-will have to explicitly instantiate the sensor chips from user-space. See
-method 4 in Documentation/i2c/instantiating-devices.rst. Possible slave
-addresses are 0x18, 0x1a, 0x29, 0x2b, 0x4c, or 0x4e. It is likely that
-only temp2 will be correct and temp1 will have to be ignored.
-
-Previous generations of the Xeon processor (based on Pentium II/III)
-didn't have these sensors. Next generations of Xeon processors (533 MHz
-FSB and faster) lost them, until the Core-based generation which
-introduced integrated digital thermal sensors. These are supported by
-the coretemp driver.
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
- * monitoring
- * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
- * Philip Edelbrock <phil@netroedge.com>
- */
-
-#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>
-
-
-/* Addresses to scan */
-static const unsigned short normal_i2c[] = {
- 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
-
-enum chips {
- adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
-
-/* adm1021 constants specified below */
-
-/* The adm1021 registers */
-/* Read-only */
-/* For nr in 0-1 */
-#define ADM1021_REG_TEMP(nr) (nr)
-#define ADM1021_REG_STATUS 0x02
-/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
-#define ADM1021_REG_MAN_ID 0xFE
-/* ADM1021 = 0x0X, ADM1023 = 0x3X */
-#define ADM1021_REG_DEV_ID 0xFF
-/* These use different addresses for reading/writing */
-#define ADM1021_REG_CONFIG_R 0x03
-#define ADM1021_REG_CONFIG_W 0x09
-#define ADM1021_REG_CONV_RATE_R 0x04
-#define ADM1021_REG_CONV_RATE_W 0x0A
-/* These are for the ADM1023's additional precision on the remote temp sensor */
-#define ADM1023_REG_REM_TEMP_PREC 0x10
-#define ADM1023_REG_REM_OFFSET 0x11
-#define ADM1023_REG_REM_OFFSET_PREC 0x12
-#define ADM1023_REG_REM_TOS_PREC 0x13
-#define ADM1023_REG_REM_THYST_PREC 0x14
-/* limits */
-/* For nr in 0-1 */
-#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
-#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
-#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
-#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
-/* write-only */
-#define ADM1021_REG_ONESHOT 0x0F
-
-/* Initial values */
-
-/*
- * Note: Even though I left the low and high limits named os and hyst,
- * they don't quite work like a thermostat the way the LM75 does. I.e.,
- * a lower temp than THYST actually triggers an alarm instead of
- * clearing it. Weird, ey? --Phil
- */
-
-/* Each client has this additional data */
-struct adm1021_data {
- struct i2c_client *client;
- enum chips type;
-
- const struct attribute_group *groups[3];
-
- struct mutex update_lock;
- bool valid; /* true if following fields are valid */
- char low_power; /* !=0 if device in low power mode */
- unsigned long last_updated; /* In jiffies */
-
- int temp_max[2]; /* Register values */
- int temp_min[2];
- int temp[2];
- u8 alarms;
- /* Special values for ADM1023 only */
- u8 remote_temp_offset;
- u8 remote_temp_offset_prec;
-};
-
-/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
-static bool read_only;
-
-static struct adm1021_data *adm1021_update_device(struct device *dev)
-{
- struct adm1021_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
- || !data->valid) {
- int i;
-
- dev_dbg(dev, "Starting adm1021 update\n");
-
- for (i = 0; i < 2; i++) {
- data->temp[i] = 1000 *
- (s8) i2c_smbus_read_byte_data(
- client, ADM1021_REG_TEMP(i));
- data->temp_max[i] = 1000 *
- (s8) i2c_smbus_read_byte_data(
- client, ADM1021_REG_TOS_R(i));
- if (data->type != lm84) {
- data->temp_min[i] = 1000 *
- (s8) i2c_smbus_read_byte_data(client,
- ADM1021_REG_THYST_R(i));
- }
- }
- data->alarms = i2c_smbus_read_byte_data(client,
- ADM1021_REG_STATUS) & 0x7c;
- if (data->type == adm1023) {
- /*
- * The ADM1023 provides 3 extra bits of precision for
- * the remote sensor in extra registers.
- */
- data->temp[1] += 125 * (i2c_smbus_read_byte_data(
- client, ADM1023_REG_REM_TEMP_PREC) >> 5);
- data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
- client, ADM1023_REG_REM_TOS_PREC) >> 5);
- data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
- client, ADM1023_REG_REM_THYST_PREC) >> 5);
- data->remote_temp_offset =
- i2c_smbus_read_byte_data(client,
- ADM1023_REG_REM_OFFSET);
- data->remote_temp_offset_prec =
- i2c_smbus_read_byte_data(client,
- ADM1023_REG_REM_OFFSET_PREC);
- }
- data->last_updated = jiffies;
- data->valid = true;
- }
-
- mutex_unlock(&data->update_lock);
-
- return data;
-}
-
-static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- int index = to_sensor_dev_attr(devattr)->index;
- struct adm1021_data *data = adm1021_update_device(dev);
-
- return sprintf(buf, "%d\n", data->temp[index]);
-}
-
-static ssize_t temp_max_show(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- int index = to_sensor_dev_attr(devattr)->index;
- struct adm1021_data *data = adm1021_update_device(dev);
-
- return sprintf(buf, "%d\n", data->temp_max[index]);
-}
-
-static ssize_t temp_min_show(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- int index = to_sensor_dev_attr(devattr)->index;
- struct adm1021_data *data = adm1021_update_device(dev);
-
- return sprintf(buf, "%d\n", data->temp_min[index]);
-}
-
-static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- int index = to_sensor_dev_attr(attr)->index;
- struct adm1021_data *data = adm1021_update_device(dev);
- return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
-}
-
-static ssize_t alarms_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct adm1021_data *data = adm1021_update_device(dev);
- return sprintf(buf, "%u\n", data->alarms);
-}
-
-static ssize_t temp_max_store(struct device *dev,
- struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- int index = to_sensor_dev_attr(devattr)->index;
- struct adm1021_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- long temp;
- int reg_val, err;
-
- err = kstrtol(buf, 10, &temp);
- if (err)
- return err;
- temp /= 1000;
-
- mutex_lock(&data->update_lock);
- reg_val = clamp_val(temp, -128, 127);
- data->temp_max[index] = reg_val * 1000;
- if (!read_only)
- i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
- reg_val);
- mutex_unlock(&data->update_lock);
-
- return count;
-}
-
-static ssize_t temp_min_store(struct device *dev,
- struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- int index = to_sensor_dev_attr(devattr)->index;
- struct adm1021_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- long temp;
- int reg_val, err;
-
- err = kstrtol(buf, 10, &temp);
- if (err)
- return err;
- temp /= 1000;
-
- mutex_lock(&data->update_lock);
- reg_val = clamp_val(temp, -128, 127);
- data->temp_min[index] = reg_val * 1000;
- if (!read_only)
- i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
- reg_val);
- mutex_unlock(&data->update_lock);
-
- return count;
-}
-
-static ssize_t low_power_show(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- struct adm1021_data *data = adm1021_update_device(dev);
- return sprintf(buf, "%d\n", data->low_power);
-}
-
-static ssize_t low_power_store(struct device *dev,
- struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- struct adm1021_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- char low_power;
- unsigned long val;
- int err;
-
- err = kstrtoul(buf, 10, &val);
- if (err)
- return err;
- low_power = val != 0;
-
- mutex_lock(&data->update_lock);
- if (low_power != data->low_power) {
- int config = i2c_smbus_read_byte_data(
- client, ADM1021_REG_CONFIG_R);
- data->low_power = low_power;
- i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
- (config & 0xBF) | (low_power << 6));
- }
- mutex_unlock(&data->update_lock);
-
- return count;
-}
-
-
-static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
-static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
-static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
-static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
-static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
-static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
-static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 5);
-static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
-static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
-static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
-
-static DEVICE_ATTR_RO(alarms);
-static DEVICE_ATTR_RW(low_power);
-
-static struct attribute *adm1021_attributes[] = {
- &sensor_dev_attr_temp1_max.dev_attr.attr,
- &sensor_dev_attr_temp1_input.dev_attr.attr,
- &sensor_dev_attr_temp2_max.dev_attr.attr,
- &sensor_dev_attr_temp2_input.dev_attr.attr,
- &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_fault.dev_attr.attr,
- &dev_attr_alarms.attr,
- &dev_attr_low_power.attr,
- NULL
-};
-
-static const struct attribute_group adm1021_group = {
- .attrs = adm1021_attributes,
-};
-
-static struct attribute *adm1021_min_attributes[] = {
- &sensor_dev_attr_temp1_min.dev_attr.attr,
- &sensor_dev_attr_temp2_min.dev_attr.attr,
- &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
- NULL
-};
-
-static const struct attribute_group adm1021_min_group = {
- .attrs = adm1021_min_attributes,
-};
-
-/* Return 0 if detection is successful, -ENODEV otherwise */
-static int adm1021_detect(struct i2c_client *client,
- struct i2c_board_info *info)
-{
- struct i2c_adapter *adapter = client->adapter;
- const char *type_name;
- int reg, conv_rate, status, config, man_id, dev_id;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
- pr_debug("detect failed, smbus byte data not supported!\n");
- return -ENODEV;
- }
-
- status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
- conv_rate = i2c_smbus_read_byte_data(client,
- ADM1021_REG_CONV_RATE_R);
- config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
-
- /* Check unused bits */
- if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
- pr_debug("detect failed, chip not detected!\n");
- return -ENODEV;
- }
-
- /* Determine the chip type. */
- man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
- dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
-
- if (man_id < 0 || dev_id < 0)
- return -ENODEV;
-
- if (man_id == 0x4d && dev_id == 0x01) {
- /*
- * dev_id 0x01 matches MAX6680, MAX6695, MAX6696, and possibly
- * others. Read register which is unsupported on MAX1617 but
- * exists on all those chips and compare with the dev_id
- * register. If it matches, it may be a MAX1617A.
- */
- reg = i2c_smbus_read_byte_data(client,
- ADM1023_REG_REM_TEMP_PREC);
- if (reg != dev_id)
- return -ENODEV;
- type_name = "max1617a";
- } else if (man_id == 0x41) {
- if ((dev_id & 0xF0) == 0x30)
- type_name = "adm1023";
- else if ((dev_id & 0xF0) == 0x00)
- type_name = "adm1021";
- else
- return -ENODEV;
- } else if (man_id == 0x49)
- type_name = "thmc10";
- else if (man_id == 0x23)
- type_name = "gl523sm";
- else if (man_id == 0x54)
- type_name = "mc1066";
- else {
- int lte, rte, lhi, rhi, llo, rlo;
-
- /* extra checks for LM84 and MAX1617 to avoid misdetections */
-
- llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
- rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
-
- /* fail if any of the additional register reads failed */
- if (llo < 0 || rlo < 0)
- return -ENODEV;
-
- lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
- rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
- lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
- rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
-
- /*
- * Fail for negative temperatures and negative high limits.
- * This check also catches read errors on the tested registers.
- */
- if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
- return -ENODEV;
-
- /* fail if all registers hold the same value */
- if (lte == rte && lte == lhi && lte == rhi && lte == llo
- && lte == rlo)
- return -ENODEV;
-
- /*
- * LM84 Mfr ID is in a different place,
- * and it has more unused bits. Registers at 0xfe and 0xff
- * are undefined and return the most recently read value,
- * here the value of the configuration register.
- */
- if (conv_rate == 0x00
- && man_id == config && dev_id == config
- && (config & 0x7F) == 0x00
- && (status & 0xAB) == 0x00) {
- type_name = "lm84";
- } else {
- if ((config & 0x3f) || (status & 0x03))
- return -ENODEV;
- /* fail if low limits are larger than high limits */
- if ((s8)llo > lhi || (s8)rlo > rhi)
- return -ENODEV;
- type_name = "max1617";
- }
- }
-
- pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
- type_name, i2c_adapter_id(adapter), client->addr);
- strscpy(info->type, type_name, I2C_NAME_SIZE);
-
- return 0;
-}
-
-static void adm1021_init_client(struct i2c_client *client)
-{
- /* Enable ADC and disable suspend mode */
- i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
- i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
- /* Set Conversion rate to 1/sec (this can be tinkered with) */
- i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
-}
-
-static int adm1021_probe(struct i2c_client *client)
-{
- struct device *dev = &client->dev;
- struct adm1021_data *data;
- struct device *hwmon_dev;
-
- data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->client = client;
- data->type = (uintptr_t)i2c_get_match_data(client);
- mutex_init(&data->update_lock);
-
- /* Initialize the ADM1021 chip */
- if (data->type != lm84 && !read_only)
- adm1021_init_client(client);
-
- data->groups[0] = &adm1021_group;
- if (data->type != lm84)
- data->groups[1] = &adm1021_min_group;
-
- hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
- data, data->groups);
-
- return PTR_ERR_OR_ZERO(hwmon_dev);
-}
-
-static const struct i2c_device_id adm1021_id[] = {
- { "adm1021", adm1021 },
- { "adm1023", adm1023 },
- { "max1617", max1617 },
- { "max1617a", max1617a },
- { "thmc10", thmc10 },
- { "lm84", lm84 },
- { "gl523sm", gl523sm },
- { "mc1066", mc1066 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, adm1021_id);
-
-static struct i2c_driver adm1021_driver = {
- .class = I2C_CLASS_HWMON,
- .driver = {
- .name = "adm1021",
- },
- .probe = adm1021_probe,
- .id_table = adm1021_id,
- .detect = adm1021_detect,
- .address_list = normal_i2c,
-};
-
-module_i2c_driver(adm1021_driver);
-
-MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
- "Philip Edelbrock <phil@netroedge.com>");
-MODULE_DESCRIPTION("adm1021 driver");
-MODULE_LICENSE("GPL");
-
-module_param(read_only, bool, 0);
-MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Driver for +/-1 degree C, SMBus-Compatible Remote/Local Temperature Sensor
- * with Overtemperature Alarm
- *
- * Copyright (C) 2011 AppearTV AS
- *
- * Derived from:
- *
- * Based on the max1619 driver.
- * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
- * Jean Delvare <jdelvare@suse.de>
- *
- * The MAX6642 is a sensor chip made by Maxim.
- * It reports up to two temperatures (its own plus up to
- * one external one). Complete datasheet can be
- * obtained from Maxim's website at:
- * http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf
- */
-
-
-#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[] = {
- 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
-
-/*
- * The MAX6642 registers
- */
-
-#define MAX6642_REG_R_MAN_ID 0xFE
-#define MAX6642_REG_R_CONFIG 0x03
-#define MAX6642_REG_W_CONFIG 0x09
-#define MAX6642_REG_R_STATUS 0x02
-#define MAX6642_REG_R_LOCAL_TEMP 0x00
-#define MAX6642_REG_R_LOCAL_TEMPL 0x11
-#define MAX6642_REG_R_LOCAL_HIGH 0x05
-#define MAX6642_REG_W_LOCAL_HIGH 0x0B
-#define MAX6642_REG_R_REMOTE_TEMP 0x01
-#define MAX6642_REG_R_REMOTE_TEMPL 0x10
-#define MAX6642_REG_R_REMOTE_HIGH 0x07
-#define MAX6642_REG_W_REMOTE_HIGH 0x0D
-
-/*
- * Conversions
- */
-
-static int temp_from_reg10(int val)
-{
- return val * 250;
-}
-
-static int temp_from_reg(int val)
-{
- return val * 1000;
-}
-
-static int temp_to_reg(int val)
-{
- return val / 1000;
-}
-
-/*
- * Client data (each client gets its own)
- */
-
-struct max6642_data {
- struct i2c_client *client;
- struct mutex update_lock;
- bool valid; /* zero until following fields are valid */
- unsigned long last_updated; /* in jiffies */
-
- /* registers values */
- u16 temp_input[2]; /* local/remote */
- u16 temp_high[2]; /* local/remote */
- u8 alarms;
-};
-
-/*
- * Real code
- */
-
-static void max6642_init_client(struct max6642_data *data,
- struct i2c_client *client)
-{
- u8 config;
-
- /*
- * Start the conversions.
- */
- config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
- if (config & 0x40)
- i2c_smbus_write_byte_data(client, MAX6642_REG_W_CONFIG,
- config & 0xBF); /* run */
-
- data->temp_high[0] = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_LOCAL_HIGH);
- data->temp_high[1] = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_REMOTE_HIGH);
-}
-
-/* Return 0 if detection is successful, -ENODEV otherwise */
-static int max6642_detect(struct i2c_client *client,
- struct i2c_board_info *info)
-{
- struct i2c_adapter *adapter = client->adapter;
- u8 reg_config, reg_status, man_id;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- return -ENODEV;
-
- /* identification */
- man_id = i2c_smbus_read_byte_data(client, MAX6642_REG_R_MAN_ID);
- if (man_id != 0x4D)
- return -ENODEV;
-
- /* sanity check */
- if (i2c_smbus_read_byte_data(client, 0x04) != 0x4D
- || i2c_smbus_read_byte_data(client, 0x06) != 0x4D
- || i2c_smbus_read_byte_data(client, 0xff) != 0x4D)
- return -ENODEV;
-
- /*
- * We read the config and status register, the 4 lower bits in the
- * config register should be zero and bit 5, 3, 1 and 0 should be
- * zero in the status register.
- */
- reg_config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
- if ((reg_config & 0x0f) != 0x00)
- return -ENODEV;
-
- /* in between, another round of sanity checks */
- if (i2c_smbus_read_byte_data(client, 0x04) != reg_config
- || i2c_smbus_read_byte_data(client, 0x06) != reg_config
- || i2c_smbus_read_byte_data(client, 0xff) != reg_config)
- return -ENODEV;
-
- reg_status = i2c_smbus_read_byte_data(client, MAX6642_REG_R_STATUS);
- if ((reg_status & 0x2b) != 0x00)
- return -ENODEV;
-
- strscpy(info->type, "max6642", I2C_NAME_SIZE);
-
- return 0;
-}
-
-static struct max6642_data *max6642_update_device(struct device *dev)
-{
- struct max6642_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- u16 val, tmp;
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- dev_dbg(dev, "Updating max6642 data.\n");
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_LOCAL_TEMPL);
- tmp = (val >> 6) & 3;
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_LOCAL_TEMP);
- val = (val << 2) | tmp;
- data->temp_input[0] = val;
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_REMOTE_TEMPL);
- tmp = (val >> 6) & 3;
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_REMOTE_TEMP);
- val = (val << 2) | tmp;
- data->temp_input[1] = val;
- data->alarms = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_STATUS);
-
- data->last_updated = jiffies;
- data->valid = true;
- }
-
- mutex_unlock(&data->update_lock);
-
- return data;
-}
-
-/*
- * Sysfs stuff
- */
-
-static ssize_t temp_max10_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
-{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
- struct max6642_data *data = max6642_update_device(dev);
-
- return sprintf(buf, "%d\n",
- temp_from_reg10(data->temp_input[attr->index]));
-}
-
-static ssize_t temp_max_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
- struct max6642_data *data = max6642_update_device(dev);
-
- return sprintf(buf, "%d\n", temp_from_reg(data->temp_high[attr2->nr]));
-}
-
-static ssize_t temp_max_store(struct device *dev,
- struct device_attribute *attr, const char *buf,
- size_t count)
-{
- struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
- struct max6642_data *data = dev_get_drvdata(dev);
- unsigned long val;
- int err;
-
- err = kstrtoul(buf, 10, &val);
- if (err < 0)
- return err;
-
- mutex_lock(&data->update_lock);
- data->temp_high[attr2->nr] = clamp_val(temp_to_reg(val), 0, 255);
- i2c_smbus_write_byte_data(data->client, attr2->index,
- data->temp_high[attr2->nr]);
- mutex_unlock(&data->update_lock);
- return count;
-}
-
-static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- int bitnr = to_sensor_dev_attr(attr)->index;
- struct max6642_data *data = max6642_update_device(dev);
- return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
-}
-
-static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_max10, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_max10, 1);
-static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp_max, 0,
- MAX6642_REG_W_LOCAL_HIGH);
-static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp_max, 1,
- MAX6642_REG_W_REMOTE_HIGH);
-static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
-static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
-static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
-
-static struct attribute *max6642_attrs[] = {
- &sensor_dev_attr_temp1_input.dev_attr.attr,
- &sensor_dev_attr_temp2_input.dev_attr.attr,
- &sensor_dev_attr_temp1_max.dev_attr.attr,
- &sensor_dev_attr_temp2_max.dev_attr.attr,
-
- &sensor_dev_attr_temp2_fault.dev_attr.attr,
- &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
- NULL
-};
-ATTRIBUTE_GROUPS(max6642);
-
-static int max6642_probe(struct i2c_client *client)
-{
- struct device *dev = &client->dev;
- struct max6642_data *data;
- struct device *hwmon_dev;
-
- data = devm_kzalloc(dev, sizeof(struct max6642_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->client = client;
- mutex_init(&data->update_lock);
-
- /* Initialize the MAX6642 chip */
- max6642_init_client(data, client);
-
- hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
- client->name, data,
- max6642_groups);
- return PTR_ERR_OR_ZERO(hwmon_dev);
-}
-
-/*
- * Driver data (common to all clients)
- */
-
-static const struct i2c_device_id max6642_id[] = {
- { "max6642" },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, max6642_id);
-
-static struct i2c_driver max6642_driver = {
- .class = I2C_CLASS_HWMON,
- .driver = {
- .name = "max6642",
- },
- .probe = max6642_probe,
- .id_table = max6642_id,
- .detect = max6642_detect,
- .address_list = normal_i2c,
-};
-
-module_i2c_driver(max6642_driver);
-
-MODULE_AUTHOR("Per Dalen <per.dalen@appeartv.com>");
-MODULE_DESCRIPTION("MAX6642 sensor driver");
-MODULE_LICENSE("GPL");
projects / users / dwmw2 / linux.git / commitdiff