329 lines
8.9 KiB
C
329 lines
8.9 KiB
C
/*
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* w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
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*
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* Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made
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* by Winbond. It reports a single external temperature with a 1 deg
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* resolution and a 3 deg accuracy. Datasheet can be obtained from
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* Winbond's website at:
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* http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf
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*
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* Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare
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* <khali@linux-fr.org>.
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*
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* Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read
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* error handling mechanism.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/i2c-sensor.h>
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/* How many retries on register read error */
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#define MAX_RETRIES 5
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/*
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* Address to scan
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* Address is fully defined internally and cannot be changed.
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*/
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static unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };
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static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
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/*
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* Insmod parameters
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*/
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SENSORS_INSMOD_1(w83l785ts);
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/*
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* The W83L785TS-S registers
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* Manufacturer ID is 0x5CA3 for Winbond.
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*/
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#define W83L785TS_REG_MAN_ID1 0x4D
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#define W83L785TS_REG_MAN_ID2 0x4C
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#define W83L785TS_REG_CHIP_ID 0x4E
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#define W83L785TS_REG_CONFIG 0x40
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#define W83L785TS_REG_TYPE 0x52
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#define W83L785TS_REG_TEMP 0x27
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#define W83L785TS_REG_TEMP_OVER 0x53 /* not sure about this one */
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/*
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* Conversions
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* The W83L785TS-S uses signed 8-bit values.
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*/
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#define TEMP_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000)
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/*
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* Functions declaration
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*/
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static int w83l785ts_attach_adapter(struct i2c_adapter *adapter);
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static int w83l785ts_detect(struct i2c_adapter *adapter, int address,
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int kind);
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static int w83l785ts_detach_client(struct i2c_client *client);
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static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
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static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);
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/*
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* Driver data (common to all clients)
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*/
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static struct i2c_driver w83l785ts_driver = {
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.owner = THIS_MODULE,
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.name = "w83l785ts",
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.id = I2C_DRIVERID_W83L785TS,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = w83l785ts_attach_adapter,
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.detach_client = w83l785ts_detach_client,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct w83l785ts_data {
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struct i2c_client client;
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struct semaphore update_lock;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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u8 temp, temp_over;
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};
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/*
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* Sysfs stuff
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*/
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static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct w83l785ts_data *data = w83l785ts_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
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}
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static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct w83l785ts_data *data = w83l785ts_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
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}
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
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static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_over, NULL);
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/*
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* Real code
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*/
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static int w83l785ts_attach_adapter(struct i2c_adapter *adapter)
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{
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if (!(adapter->class & I2C_CLASS_HWMON))
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return 0;
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return i2c_detect(adapter, &addr_data, w83l785ts_detect);
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}
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/*
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* The following function does more than just detection. If detection
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* succeeds, it also registers the new chip.
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*/
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static int w83l785ts_detect(struct i2c_adapter *adapter, int address, int kind)
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{
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struct i2c_client *new_client;
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struct w83l785ts_data *data;
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int err = 0;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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goto exit;
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if (!(data = kmalloc(sizeof(struct w83l785ts_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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memset(data, 0, sizeof(struct w83l785ts_data));
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/* The common I2C client data is placed right before the
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* W83L785TS-specific data. */
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new_client = &data->client;
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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new_client->adapter = adapter;
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new_client->driver = &w83l785ts_driver;
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new_client->flags = 0;
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/*
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* Now we do the remaining detection. A negative kind means that
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* the driver was loaded with no force parameter (default), so we
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* must both detect and identify the chip (actually there is only
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* one possible kind of chip for now, W83L785TS-S). A zero kind means
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* that the driver was loaded with the force parameter, the detection
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* step shall be skipped. A positive kind means that the driver
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* was loaded with the force parameter and a given kind of chip is
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* requested, so both the detection and the identification steps
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* are skipped.
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*/
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if (kind < 0) { /* detection */
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if (((w83l785ts_read_value(new_client,
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W83L785TS_REG_CONFIG, 0) & 0x80) != 0x00)
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|| ((w83l785ts_read_value(new_client,
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W83L785TS_REG_TYPE, 0) & 0xFC) != 0x00)) {
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dev_dbg(&adapter->dev,
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"W83L785TS-S detection failed at 0x%02x.\n",
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address);
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goto exit_free;
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}
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}
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if (kind <= 0) { /* identification */
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u16 man_id;
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u8 chip_id;
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man_id = (w83l785ts_read_value(new_client,
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W83L785TS_REG_MAN_ID1, 0) << 8) +
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w83l785ts_read_value(new_client,
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W83L785TS_REG_MAN_ID2, 0);
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chip_id = w83l785ts_read_value(new_client,
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W83L785TS_REG_CHIP_ID, 0);
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if (man_id == 0x5CA3) { /* Winbond */
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if (chip_id == 0x70) { /* W83L785TS-S */
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kind = w83l785ts;
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}
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}
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if (kind <= 0) { /* identification failed */
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dev_info(&adapter->dev,
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"Unsupported chip (man_id=0x%04X, "
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"chip_id=0x%02X).\n", man_id, chip_id);
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goto exit_free;
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}
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}
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/* We can fill in the remaining client fields. */
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strlcpy(new_client->name, "w83l785ts", I2C_NAME_SIZE);
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data->valid = 0;
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init_MUTEX(&data->update_lock);
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/* Default values in case the first read fails (unlikely). */
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data->temp_over = data->temp = 0;
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/* Tell the I2C layer a new client has arrived. */
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if ((err = i2c_attach_client(new_client)))
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goto exit_free;
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/*
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* Initialize the W83L785TS chip
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* Nothing yet, assume it is already started.
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*/
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/* Register sysfs hooks */
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device_create_file(&new_client->dev, &dev_attr_temp1_input);
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device_create_file(&new_client->dev, &dev_attr_temp1_max);
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return 0;
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exit_free:
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kfree(data);
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exit:
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return err;
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}
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static int w83l785ts_detach_client(struct i2c_client *client)
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{
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int err;
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if ((err = i2c_detach_client(client))) {
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dev_err(&client->dev, "Client deregistration failed, "
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"client not detached.\n");
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return err;
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}
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kfree(i2c_get_clientdata(client));
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return 0;
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}
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static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
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{
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int value, i;
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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++) {
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value = i2c_smbus_read_byte_data(client, reg);
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if (value >= 0) {
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dev_dbg(&client->dev, "Read 0x%02x from register "
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"0x%02x.\n", value, reg);
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return value;
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}
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dev_dbg(&client->dev, "Read failed, will retry in %d.\n", i);
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msleep(i);
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}
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dev_err(&client->dev, "Couldn't read value from register 0x%02x. "
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"Please report.\n", reg);
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return defval;
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}
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static struct w83l785ts_data *w83l785ts_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct w83l785ts_data *data = i2c_get_clientdata(client);
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down(&data->update_lock);
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if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) {
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dev_dbg(&client->dev, "Updating w83l785ts data.\n");
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data->temp = w83l785ts_read_value(client,
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W83L785TS_REG_TEMP, data->temp);
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data->temp_over = w83l785ts_read_value(client,
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W83L785TS_REG_TEMP_OVER, data->temp_over);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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up(&data->update_lock);
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return data;
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}
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static int __init sensors_w83l785ts_init(void)
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{
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return i2c_add_driver(&w83l785ts_driver);
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}
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static void __exit sensors_w83l785ts_exit(void)
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{
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i2c_del_driver(&w83l785ts_driver);
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}
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MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
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MODULE_DESCRIPTION("W83L785TS-S driver");
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MODULE_LICENSE("GPL");
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module_init(sensors_w83l785ts_init);
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module_exit(sensors_w83l785ts_exit);
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