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drivers/hwmon/w83l785ts.c
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/* * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring |
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* Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de> |
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* * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made * by Winbond. It reports a single external temperature with a 1 deg * resolution and a 3 deg accuracy. Datasheet can be obtained from * Winbond's website at: * http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf * * Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare |
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* <jdelvare@suse.de>. |
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* * Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read * error handling mechanism. * * 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. */ |
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#include <linux/module.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/err.h> |
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#include <linux/mutex.h> |
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/* How many retries on register read error */ #define MAX_RETRIES 5 /* * Address to scan * Address is fully defined internally and cannot be changed. */ |
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static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END }; |
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/* |
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* The W83L785TS-S registers * Manufacturer ID is 0x5CA3 for Winbond. */ #define W83L785TS_REG_MAN_ID1 0x4D #define W83L785TS_REG_MAN_ID2 0x4C #define W83L785TS_REG_CHIP_ID 0x4E #define W83L785TS_REG_CONFIG 0x40 #define W83L785TS_REG_TYPE 0x52 #define W83L785TS_REG_TEMP 0x27 #define W83L785TS_REG_TEMP_OVER 0x53 /* not sure about this one */ /* * Conversions * The W83L785TS-S uses signed 8-bit values. */ |
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#define TEMP_FROM_REG(val) ((val) * 1000) |
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/* * Functions declaration */ |
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static int w83l785ts_probe(struct i2c_client *client, const struct i2c_device_id *id); |
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static int w83l785ts_detect(struct i2c_client *client, |
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struct i2c_board_info *info); static int w83l785ts_remove(struct i2c_client *client); |
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static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval); static struct w83l785ts_data *w83l785ts_update_device(struct device *dev); /* * Driver data (common to all clients) */ |
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static const struct i2c_device_id w83l785ts_id[] = { |
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{ "w83l785ts", 0 }, |
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{ } }; MODULE_DEVICE_TABLE(i2c, w83l785ts_id); |
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static struct i2c_driver w83l785ts_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "w83l785ts", }, |
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.probe = w83l785ts_probe, .remove = w83l785ts_remove, .id_table = w83l785ts_id, .detect = w83l785ts_detect, |
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.address_list = normal_i2c, |
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}; /* * Client data (each client gets its own) */ struct w83l785ts_data { |
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struct device *hwmon_dev; |
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struct mutex update_lock; |
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char valid; /* zero until following fields are valid */ unsigned long last_updated; /* in jiffies */ /* registers values */ |
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s8 temp[2]; /* 0: input, 1: critical limit */ |
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}; /* * Sysfs stuff */ |
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static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
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struct w83l785ts_data *data = w83l785ts_update_device(dev); |
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return sprintf(buf, "%d ", TEMP_FROM_REG(data->temp[attr->index])); |
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} |
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1); |
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/* * Real code */ |
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/* Return 0 if detection is successful, -ENODEV otherwise */ |
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static int w83l785ts_detect(struct i2c_client *client, |
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struct i2c_board_info *info) |
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{ |
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struct i2c_adapter *adapter = client->adapter; u16 man_id; u8 chip_id; |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
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return -ENODEV; |
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|
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/* detection */ if ((w83l785ts_read_value(client, W83L785TS_REG_CONFIG, 0) & 0x80) || (w83l785ts_read_value(client, W83L785TS_REG_TYPE, 0) & 0xFC)) { dev_dbg(&adapter->dev, "W83L785TS-S detection failed at 0x%02x ", client->addr); return -ENODEV; |
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} |
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/* Identification */ man_id = (w83l785ts_read_value(client, W83L785TS_REG_MAN_ID1, 0) << 8) + w83l785ts_read_value(client, W83L785TS_REG_MAN_ID2, 0); chip_id = w83l785ts_read_value(client, W83L785TS_REG_CHIP_ID, 0); if (man_id != 0x5CA3 /* Winbond */ || chip_id != 0x70) { /* W83L785TS-S */ dev_dbg(&adapter->dev, "Unsupported chip (man_id=0x%04X, chip_id=0x%02X) ", man_id, chip_id); return -ENODEV; |
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} |
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strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE); return 0; } |
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static int w83l785ts_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) { struct w83l785ts_data *data; |
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struct device *dev = &client->dev; |
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int err; |
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data = devm_kzalloc(dev, sizeof(struct w83l785ts_data), GFP_KERNEL); if (!data) return -ENOMEM; |
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|
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i2c_set_clientdata(client, data); |
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mutex_init(&data->update_lock); |
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|
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/* * Initialize the W83L785TS chip * Nothing yet, assume it is already started. */ |
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err = device_create_file(dev, &sensor_dev_attr_temp1_input.dev_attr); |
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if (err) |
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return err; |
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|
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err = device_create_file(dev, &sensor_dev_attr_temp1_max.dev_attr); |
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if (err) goto exit_remove; |
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/* Register sysfs hooks */ |
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data->hwmon_dev = hwmon_device_register(dev); |
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if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); |
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goto exit_remove; |
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} |
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return 0; |
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exit_remove: |
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device_remove_file(dev, &sensor_dev_attr_temp1_input.dev_attr); device_remove_file(dev, &sensor_dev_attr_temp1_max.dev_attr); |
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return err; } |
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static int w83l785ts_remove(struct i2c_client *client) |
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{ |
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struct w83l785ts_data *data = i2c_get_clientdata(client); |
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hwmon_device_unregister(data->hwmon_dev); |
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device_remove_file(&client->dev, &sensor_dev_attr_temp1_input.dev_attr); device_remove_file(&client->dev, &sensor_dev_attr_temp1_max.dev_attr); |
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return 0; } static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval) { int value, i; |
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struct device *dev; const char *prefix; |
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/* * We might be called during detection, at which point the client * isn't yet fully initialized, so we can't use dev_dbg on it */ |
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if (i2c_get_clientdata(client)) { dev = &client->dev; prefix = ""; } else { dev = &client->adapter->dev; prefix = "w83l785ts: "; } |
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/* * Frequent read errors have been reported on Asus boards, so we |
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* retry on read errors. If it still fails (unlikely), return the |
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* default value requested by the caller. */ |
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for (i = 1; i <= MAX_RETRIES; i++) { value = i2c_smbus_read_byte_data(client, reg); if (value >= 0) { |
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dev_dbg(dev, "%sRead 0x%02x from register 0x%02x. ", prefix, value, reg); |
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return value; } |
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dev_dbg(dev, "%sRead failed, will retry in %d. ", prefix, i); |
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msleep(i); } |
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dev_err(dev, "%sCouldn't read value from register 0x%02x. ", prefix, |
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reg); |
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return defval; } static struct w83l785ts_data *w83l785ts_update_device(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct w83l785ts_data *data = i2c_get_clientdata(client); |
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mutex_lock(&data->update_lock); |
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if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) { dev_dbg(&client->dev, "Updating w83l785ts data. "); |
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data->temp[0] = w83l785ts_read_value(client, W83L785TS_REG_TEMP, data->temp[0]); data->temp[1] = w83l785ts_read_value(client, W83L785TS_REG_TEMP_OVER, data->temp[1]); |
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data->last_updated = jiffies; data->valid = 1; } |
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mutex_unlock(&data->update_lock); |
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return data; } |
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module_i2c_driver(w83l785ts_driver); |
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MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); |
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MODULE_DESCRIPTION("W83L785TS-S driver"); MODULE_LICENSE("GPL"); |