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![Guenter Roeck](/assets/img/avatar_default.png)
Convert to use devm_ functions to reduce code size and simplify the code. Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Jean Delvare <khali@linux-fr.org>
1112 lines
29 KiB
C
1112 lines
29 KiB
C
/*
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* lm78.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
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* Copyright (c) 2007, 2011 Jean Delvare <khali@linux-fr.org>
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.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/hwmon.h>
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#include <linux/hwmon-vid.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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#ifdef CONFIG_ISA
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#include <linux/platform_device.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#endif
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/* Addresses to scan */
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static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
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0x2e, 0x2f, I2C_CLIENT_END };
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enum chips { lm78, lm79 };
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/* Many LM78 constants specified below */
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/* Length of ISA address segment */
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#define LM78_EXTENT 8
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/* Where are the ISA address/data registers relative to the base address */
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#define LM78_ADDR_REG_OFFSET 5
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#define LM78_DATA_REG_OFFSET 6
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/* The LM78 registers */
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#define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
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#define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
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#define LM78_REG_IN(nr) (0x20 + (nr))
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#define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
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#define LM78_REG_FAN(nr) (0x28 + (nr))
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#define LM78_REG_TEMP 0x27
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#define LM78_REG_TEMP_OVER 0x39
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#define LM78_REG_TEMP_HYST 0x3a
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#define LM78_REG_ALARM1 0x41
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#define LM78_REG_ALARM2 0x42
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#define LM78_REG_VID_FANDIV 0x47
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#define LM78_REG_CONFIG 0x40
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#define LM78_REG_CHIPID 0x49
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#define LM78_REG_I2C_ADDR 0x48
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/*
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* Conversions. Rounding and limit checking is only done on the TO_REG
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* variants.
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*/
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/*
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* IN: mV (0V to 4.08V)
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* REG: 16mV/bit
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*/
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static inline u8 IN_TO_REG(unsigned long val)
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{
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unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
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return (nval + 8) / 16;
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}
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#define IN_FROM_REG(val) ((val) * 16)
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static inline u8 FAN_TO_REG(long rpm, int div)
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{
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if (rpm <= 0)
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return 255;
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return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
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}
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static inline int FAN_FROM_REG(u8 val, int div)
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{
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return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
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}
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/*
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* TEMP: mC (-128C to +127C)
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* REG: 1C/bit, two's complement
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*/
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static inline s8 TEMP_TO_REG(int val)
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{
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int nval = SENSORS_LIMIT(val, -128000, 127000) ;
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return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
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}
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static inline int TEMP_FROM_REG(s8 val)
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{
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return val * 1000;
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}
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#define DIV_FROM_REG(val) (1 << (val))
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struct lm78_data {
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struct i2c_client *client;
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struct device *hwmon_dev;
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struct mutex lock;
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enum chips type;
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/* For ISA device only */
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const char *name;
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int isa_addr;
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struct mutex update_lock;
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char valid; /* !=0 if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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u8 in[7]; /* Register value */
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u8 in_max[7]; /* Register value */
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u8 in_min[7]; /* Register value */
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u8 fan[3]; /* Register value */
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u8 fan_min[3]; /* Register value */
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s8 temp; /* Register value */
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s8 temp_over; /* Register value */
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s8 temp_hyst; /* Register value */
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u8 fan_div[3]; /* Register encoding, shifted right */
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u8 vid; /* Register encoding, combined */
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u16 alarms; /* Register encoding, combined */
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};
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static int lm78_read_value(struct lm78_data *data, u8 reg);
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static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
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static struct lm78_data *lm78_update_device(struct device *dev);
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static void lm78_init_device(struct lm78_data *data);
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/* 7 Voltages */
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static ssize_t show_in(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = lm78_update_device(dev);
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return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
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}
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static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = lm78_update_device(dev);
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return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
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}
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static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = lm78_update_device(dev);
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return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
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}
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static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = dev_get_drvdata(dev);
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int nr = attr->index;
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unsigned long val;
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int err;
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err = kstrtoul(buf, 10, &val);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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data->in_min[nr] = IN_TO_REG(val);
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lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = dev_get_drvdata(dev);
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int nr = attr->index;
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unsigned long val;
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int err;
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err = kstrtoul(buf, 10, &val);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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data->in_max[nr] = IN_TO_REG(val);
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lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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#define show_in_offset(offset) \
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static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
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show_in, NULL, offset); \
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static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
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show_in_min, set_in_min, offset); \
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static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
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show_in_max, set_in_max, offset);
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show_in_offset(0);
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show_in_offset(1);
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show_in_offset(2);
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show_in_offset(3);
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show_in_offset(4);
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show_in_offset(5);
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show_in_offset(6);
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/* Temperature */
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static ssize_t show_temp(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct lm78_data *data = lm78_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 *da,
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char *buf)
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{
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struct lm78_data *data = lm78_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 ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct lm78_data *data = dev_get_drvdata(dev);
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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data->temp_over = TEMP_TO_REG(val);
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lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct lm78_data *data = lm78_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
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}
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static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct lm78_data *data = dev_get_drvdata(dev);
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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data->temp_hyst = TEMP_TO_REG(val);
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lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
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mutex_unlock(&data->update_lock);
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return count;
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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 | S_IWUSR,
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show_temp_over, set_temp_over);
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static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
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show_temp_hyst, set_temp_hyst);
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/* 3 Fans */
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static ssize_t show_fan(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = lm78_update_device(dev);
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int nr = attr->index;
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return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
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DIV_FROM_REG(data->fan_div[nr])));
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}
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static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = lm78_update_device(dev);
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int nr = attr->index;
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return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
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DIV_FROM_REG(data->fan_div[nr])));
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}
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static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = dev_get_drvdata(dev);
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int nr = attr->index;
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unsigned long val;
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int err;
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err = kstrtoul(buf, 10, &val);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
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lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = lm78_update_device(dev);
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return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
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}
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/*
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* Note: we save and restore the fan minimum here, because its value is
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* determined in part by the fan divisor. This follows the principle of
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* least surprise; the user doesn't expect the fan minimum to change just
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* because the divisor changed.
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*/
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static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm78_data *data = dev_get_drvdata(dev);
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int nr = attr->index;
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unsigned long min;
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u8 reg;
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unsigned long val;
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int err;
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err = kstrtoul(buf, 10, &val);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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min = FAN_FROM_REG(data->fan_min[nr],
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DIV_FROM_REG(data->fan_div[nr]));
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switch (val) {
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case 1:
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data->fan_div[nr] = 0;
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break;
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case 2:
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data->fan_div[nr] = 1;
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break;
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case 4:
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data->fan_div[nr] = 2;
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break;
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case 8:
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data->fan_div[nr] = 3;
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break;
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default:
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dev_err(dev, "fan_div value %ld not "
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"supported. Choose one of 1, 2, 4 or 8!\n", val);
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mutex_unlock(&data->update_lock);
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return -EINVAL;
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}
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reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
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switch (nr) {
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case 0:
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reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
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break;
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case 1:
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reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
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break;
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}
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lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
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data->fan_min[nr] =
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FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
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lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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#define show_fan_offset(offset) \
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static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
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show_fan, NULL, offset - 1); \
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static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
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show_fan_min, set_fan_min, offset - 1);
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show_fan_offset(1);
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show_fan_offset(2);
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show_fan_offset(3);
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/* Fan 3 divisor is locked in H/W */
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static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
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show_fan_div, set_fan_div, 0);
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static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
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show_fan_div, set_fan_div, 1);
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static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
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/* VID */
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static ssize_t show_vid(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct lm78_data *data = lm78_update_device(dev);
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return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
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}
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static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
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/* Alarms */
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static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct lm78_data *data = lm78_update_device(dev);
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return sprintf(buf, "%u\n", data->alarms);
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}
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct lm78_data *data = lm78_update_device(dev);
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int nr = to_sensor_dev_attr(da)->index;
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return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
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}
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static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
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static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
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static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
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static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
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|
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
|
|
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
|
|
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
|
|
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
|
|
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
|
|
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
|
|
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
|
|
|
|
static struct attribute *lm78_attributes[] = {
|
|
&sensor_dev_attr_in0_input.dev_attr.attr,
|
|
&sensor_dev_attr_in0_min.dev_attr.attr,
|
|
&sensor_dev_attr_in0_max.dev_attr.attr,
|
|
&sensor_dev_attr_in0_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in1_input.dev_attr.attr,
|
|
&sensor_dev_attr_in1_min.dev_attr.attr,
|
|
&sensor_dev_attr_in1_max.dev_attr.attr,
|
|
&sensor_dev_attr_in1_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in2_input.dev_attr.attr,
|
|
&sensor_dev_attr_in2_min.dev_attr.attr,
|
|
&sensor_dev_attr_in2_max.dev_attr.attr,
|
|
&sensor_dev_attr_in2_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in3_input.dev_attr.attr,
|
|
&sensor_dev_attr_in3_min.dev_attr.attr,
|
|
&sensor_dev_attr_in3_max.dev_attr.attr,
|
|
&sensor_dev_attr_in3_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in4_input.dev_attr.attr,
|
|
&sensor_dev_attr_in4_min.dev_attr.attr,
|
|
&sensor_dev_attr_in4_max.dev_attr.attr,
|
|
&sensor_dev_attr_in4_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in5_input.dev_attr.attr,
|
|
&sensor_dev_attr_in5_min.dev_attr.attr,
|
|
&sensor_dev_attr_in5_max.dev_attr.attr,
|
|
&sensor_dev_attr_in5_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in6_input.dev_attr.attr,
|
|
&sensor_dev_attr_in6_min.dev_attr.attr,
|
|
&sensor_dev_attr_in6_max.dev_attr.attr,
|
|
&sensor_dev_attr_in6_alarm.dev_attr.attr,
|
|
&dev_attr_temp1_input.attr,
|
|
&dev_attr_temp1_max.attr,
|
|
&dev_attr_temp1_max_hyst.attr,
|
|
&sensor_dev_attr_temp1_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_fan1_input.dev_attr.attr,
|
|
&sensor_dev_attr_fan1_min.dev_attr.attr,
|
|
&sensor_dev_attr_fan1_div.dev_attr.attr,
|
|
&sensor_dev_attr_fan1_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_input.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_min.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_div.dev_attr.attr,
|
|
&sensor_dev_attr_fan2_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_fan3_input.dev_attr.attr,
|
|
&sensor_dev_attr_fan3_min.dev_attr.attr,
|
|
&sensor_dev_attr_fan3_div.dev_attr.attr,
|
|
&sensor_dev_attr_fan3_alarm.dev_attr.attr,
|
|
&dev_attr_alarms.attr,
|
|
&dev_attr_cpu0_vid.attr,
|
|
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lm78_group = {
|
|
.attrs = lm78_attributes,
|
|
};
|
|
|
|
/*
|
|
* ISA related code
|
|
*/
|
|
#ifdef CONFIG_ISA
|
|
|
|
/* ISA device, if found */
|
|
static struct platform_device *pdev;
|
|
|
|
static unsigned short isa_address = 0x290;
|
|
|
|
/*
|
|
* I2C devices get this name attribute automatically, but for ISA devices
|
|
* we must create it by ourselves.
|
|
*/
|
|
static ssize_t show_name(struct device *dev, struct device_attribute
|
|
*devattr, char *buf)
|
|
{
|
|
struct lm78_data *data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%s\n", data->name);
|
|
}
|
|
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
|
|
|
|
static struct lm78_data *lm78_data_if_isa(void)
|
|
{
|
|
return pdev ? platform_get_drvdata(pdev) : NULL;
|
|
}
|
|
|
|
/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
|
|
static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
|
|
{
|
|
struct lm78_data *isa;
|
|
int i;
|
|
|
|
if (!pdev) /* No ISA chip */
|
|
return 0;
|
|
isa = platform_get_drvdata(pdev);
|
|
|
|
if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
|
|
return 0; /* Address doesn't match */
|
|
if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
|
|
return 0; /* Chip type doesn't match */
|
|
|
|
/*
|
|
* We compare all the limit registers, the config register and the
|
|
* interrupt mask registers
|
|
*/
|
|
for (i = 0x2b; i <= 0x3d; i++) {
|
|
if (lm78_read_value(isa, i) !=
|
|
i2c_smbus_read_byte_data(client, i))
|
|
return 0;
|
|
}
|
|
if (lm78_read_value(isa, LM78_REG_CONFIG) !=
|
|
i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
|
|
return 0;
|
|
for (i = 0x43; i <= 0x46; i++) {
|
|
if (lm78_read_value(isa, i) !=
|
|
i2c_smbus_read_byte_data(client, i))
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
#else /* !CONFIG_ISA */
|
|
|
|
static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct lm78_data *lm78_data_if_isa(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_ISA */
|
|
|
|
static int lm78_i2c_detect(struct i2c_client *client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
int i;
|
|
struct lm78_data *isa = lm78_data_if_isa();
|
|
const char *client_name;
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
int address = client->addr;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* We block updates of the ISA device to minimize the risk of
|
|
* concurrent access to the same LM78 chip through different
|
|
* interfaces.
|
|
*/
|
|
if (isa)
|
|
mutex_lock(&isa->update_lock);
|
|
|
|
if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
|
|
|| i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
|
|
goto err_nodev;
|
|
|
|
/* Explicitly prevent the misdetection of Winbond chips */
|
|
i = i2c_smbus_read_byte_data(client, 0x4f);
|
|
if (i == 0xa3 || i == 0x5c)
|
|
goto err_nodev;
|
|
|
|
/* Determine the chip type. */
|
|
i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
|
|
if (i == 0x00 || i == 0x20 /* LM78 */
|
|
|| i == 0x40) /* LM78-J */
|
|
client_name = "lm78";
|
|
else if ((i & 0xfe) == 0xc0)
|
|
client_name = "lm79";
|
|
else
|
|
goto err_nodev;
|
|
|
|
if (lm78_alias_detect(client, i)) {
|
|
dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
|
|
"be the same as ISA device\n", address);
|
|
goto err_nodev;
|
|
}
|
|
|
|
if (isa)
|
|
mutex_unlock(&isa->update_lock);
|
|
|
|
strlcpy(info->type, client_name, I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
|
|
err_nodev:
|
|
if (isa)
|
|
mutex_unlock(&isa->update_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int lm78_i2c_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct lm78_data *data;
|
|
int err;
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
data->client = client;
|
|
data->type = id->driver_data;
|
|
|
|
/* Initialize the LM78 chip */
|
|
lm78_init_device(data);
|
|
|
|
/* Register sysfs hooks */
|
|
err = sysfs_create_group(&client->dev.kobj, &lm78_group);
|
|
if (err)
|
|
return err;
|
|
|
|
data->hwmon_dev = hwmon_device_register(&client->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
sysfs_remove_group(&client->dev.kobj, &lm78_group);
|
|
return err;
|
|
}
|
|
|
|
static int lm78_i2c_remove(struct i2c_client *client)
|
|
{
|
|
struct lm78_data *data = i2c_get_clientdata(client);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &lm78_group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lm78_i2c_id[] = {
|
|
{ "lm78", lm78 },
|
|
{ "lm79", lm79 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
|
|
|
|
static struct i2c_driver lm78_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "lm78",
|
|
},
|
|
.probe = lm78_i2c_probe,
|
|
.remove = lm78_i2c_remove,
|
|
.id_table = lm78_i2c_id,
|
|
.detect = lm78_i2c_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
/*
|
|
* The SMBus locks itself, but ISA access must be locked explicitly!
|
|
* We don't want to lock the whole ISA bus, so we lock each client
|
|
* separately.
|
|
* We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
|
|
* would slow down the LM78 access and should not be necessary.
|
|
*/
|
|
static int lm78_read_value(struct lm78_data *data, u8 reg)
|
|
{
|
|
struct i2c_client *client = data->client;
|
|
|
|
#ifdef CONFIG_ISA
|
|
if (!client) { /* ISA device */
|
|
int res;
|
|
mutex_lock(&data->lock);
|
|
outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
|
|
res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
|
|
mutex_unlock(&data->lock);
|
|
return res;
|
|
} else
|
|
#endif
|
|
return i2c_smbus_read_byte_data(client, reg);
|
|
}
|
|
|
|
static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
|
|
{
|
|
struct i2c_client *client = data->client;
|
|
|
|
#ifdef CONFIG_ISA
|
|
if (!client) { /* ISA device */
|
|
mutex_lock(&data->lock);
|
|
outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
|
|
outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
|
|
mutex_unlock(&data->lock);
|
|
return 0;
|
|
} else
|
|
#endif
|
|
return i2c_smbus_write_byte_data(client, reg, value);
|
|
}
|
|
|
|
static void lm78_init_device(struct lm78_data *data)
|
|
{
|
|
u8 config;
|
|
int i;
|
|
|
|
/* Start monitoring */
|
|
config = lm78_read_value(data, LM78_REG_CONFIG);
|
|
if ((config & 0x09) != 0x01)
|
|
lm78_write_value(data, LM78_REG_CONFIG,
|
|
(config & 0xf7) | 0x01);
|
|
|
|
/* A few vars need to be filled upon startup */
|
|
for (i = 0; i < 3; i++) {
|
|
data->fan_min[i] = lm78_read_value(data,
|
|
LM78_REG_FAN_MIN(i));
|
|
}
|
|
|
|
mutex_init(&data->update_lock);
|
|
}
|
|
|
|
static struct lm78_data *lm78_update_device(struct device *dev)
|
|
{
|
|
struct lm78_data *data = dev_get_drvdata(dev);
|
|
int i;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|
|
|| !data->valid) {
|
|
|
|
dev_dbg(dev, "Starting lm78 update\n");
|
|
|
|
for (i = 0; i <= 6; i++) {
|
|
data->in[i] =
|
|
lm78_read_value(data, LM78_REG_IN(i));
|
|
data->in_min[i] =
|
|
lm78_read_value(data, LM78_REG_IN_MIN(i));
|
|
data->in_max[i] =
|
|
lm78_read_value(data, LM78_REG_IN_MAX(i));
|
|
}
|
|
for (i = 0; i < 3; i++) {
|
|
data->fan[i] =
|
|
lm78_read_value(data, LM78_REG_FAN(i));
|
|
data->fan_min[i] =
|
|
lm78_read_value(data, LM78_REG_FAN_MIN(i));
|
|
}
|
|
data->temp = lm78_read_value(data, LM78_REG_TEMP);
|
|
data->temp_over =
|
|
lm78_read_value(data, LM78_REG_TEMP_OVER);
|
|
data->temp_hyst =
|
|
lm78_read_value(data, LM78_REG_TEMP_HYST);
|
|
i = lm78_read_value(data, LM78_REG_VID_FANDIV);
|
|
data->vid = i & 0x0f;
|
|
if (data->type == lm79)
|
|
data->vid |=
|
|
(lm78_read_value(data, LM78_REG_CHIPID) &
|
|
0x01) << 4;
|
|
else
|
|
data->vid |= 0x10;
|
|
data->fan_div[0] = (i >> 4) & 0x03;
|
|
data->fan_div[1] = i >> 6;
|
|
data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
|
|
(lm78_read_value(data, LM78_REG_ALARM2) << 8);
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
|
|
data->fan_div[2] = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
#ifdef CONFIG_ISA
|
|
static int __devinit lm78_isa_probe(struct platform_device *pdev)
|
|
{
|
|
int err;
|
|
struct lm78_data *data;
|
|
struct resource *res;
|
|
|
|
/* Reserve the ISA region */
|
|
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
|
if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET,
|
|
2, "lm78"))
|
|
return -EBUSY;
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&data->lock);
|
|
data->isa_addr = res->start;
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
|
|
data->type = lm79;
|
|
data->name = "lm79";
|
|
} else {
|
|
data->type = lm78;
|
|
data->name = "lm78";
|
|
}
|
|
|
|
/* Initialize the LM78 chip */
|
|
lm78_init_device(data);
|
|
|
|
/* Register sysfs hooks */
|
|
err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
|
|
if (err)
|
|
goto exit_remove_files;
|
|
err = device_create_file(&pdev->dev, &dev_attr_name);
|
|
if (err)
|
|
goto exit_remove_files;
|
|
|
|
data->hwmon_dev = hwmon_device_register(&pdev->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto exit_remove_files;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove_files:
|
|
sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
|
|
device_remove_file(&pdev->dev, &dev_attr_name);
|
|
return err;
|
|
}
|
|
|
|
static int __devexit lm78_isa_remove(struct platform_device *pdev)
|
|
{
|
|
struct lm78_data *data = platform_get_drvdata(pdev);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
|
|
device_remove_file(&pdev->dev, &dev_attr_name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver lm78_isa_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "lm78",
|
|
},
|
|
.probe = lm78_isa_probe,
|
|
.remove = __devexit_p(lm78_isa_remove),
|
|
};
|
|
|
|
/* return 1 if a supported chip is found, 0 otherwise */
|
|
static int __init lm78_isa_found(unsigned short address)
|
|
{
|
|
int val, save, found = 0;
|
|
int port;
|
|
|
|
/*
|
|
* Some boards declare base+0 to base+7 as a PNP device, some base+4
|
|
* to base+7 and some base+5 to base+6. So we better request each port
|
|
* individually for the probing phase.
|
|
*/
|
|
for (port = address; port < address + LM78_EXTENT; port++) {
|
|
if (!request_region(port, 1, "lm78")) {
|
|
pr_debug("Failed to request port 0x%x\n", port);
|
|
goto release;
|
|
}
|
|
}
|
|
|
|
#define REALLY_SLOW_IO
|
|
/*
|
|
* We need the timeouts for at least some LM78-like
|
|
* chips. But only if we read 'undefined' registers.
|
|
*/
|
|
val = inb_p(address + 1);
|
|
if (inb_p(address + 2) != val
|
|
|| inb_p(address + 3) != val
|
|
|| inb_p(address + 7) != val)
|
|
goto release;
|
|
#undef REALLY_SLOW_IO
|
|
|
|
/*
|
|
* We should be able to change the 7 LSB of the address port. The
|
|
* MSB (busy flag) should be clear initially, set after the write.
|
|
*/
|
|
save = inb_p(address + LM78_ADDR_REG_OFFSET);
|
|
if (save & 0x80)
|
|
goto release;
|
|
val = ~save & 0x7f;
|
|
outb_p(val, address + LM78_ADDR_REG_OFFSET);
|
|
if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
|
|
outb_p(save, address + LM78_ADDR_REG_OFFSET);
|
|
goto release;
|
|
}
|
|
|
|
/* We found a device, now see if it could be an LM78 */
|
|
outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
|
|
val = inb_p(address + LM78_DATA_REG_OFFSET);
|
|
if (val & 0x80)
|
|
goto release;
|
|
outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
|
|
val = inb_p(address + LM78_DATA_REG_OFFSET);
|
|
if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
|
|
goto release;
|
|
|
|
/* The busy flag should be clear again */
|
|
if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
|
|
goto release;
|
|
|
|
/* Explicitly prevent the misdetection of Winbond chips */
|
|
outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
|
|
val = inb_p(address + LM78_DATA_REG_OFFSET);
|
|
if (val == 0xa3 || val == 0x5c)
|
|
goto release;
|
|
|
|
/* Explicitly prevent the misdetection of ITE chips */
|
|
outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
|
|
val = inb_p(address + LM78_DATA_REG_OFFSET);
|
|
if (val == 0x90)
|
|
goto release;
|
|
|
|
/* Determine the chip type */
|
|
outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
|
|
val = inb_p(address + LM78_DATA_REG_OFFSET);
|
|
if (val == 0x00 || val == 0x20 /* LM78 */
|
|
|| val == 0x40 /* LM78-J */
|
|
|| (val & 0xfe) == 0xc0) /* LM79 */
|
|
found = 1;
|
|
|
|
if (found)
|
|
pr_info("Found an %s chip at %#x\n",
|
|
val & 0x80 ? "LM79" : "LM78", (int)address);
|
|
|
|
release:
|
|
for (port--; port >= address; port--)
|
|
release_region(port, 1);
|
|
return found;
|
|
}
|
|
|
|
static int __init lm78_isa_device_add(unsigned short address)
|
|
{
|
|
struct resource res = {
|
|
.start = address,
|
|
.end = address + LM78_EXTENT - 1,
|
|
.name = "lm78",
|
|
.flags = IORESOURCE_IO,
|
|
};
|
|
int err;
|
|
|
|
pdev = platform_device_alloc("lm78", address);
|
|
if (!pdev) {
|
|
err = -ENOMEM;
|
|
pr_err("Device allocation failed\n");
|
|
goto exit;
|
|
}
|
|
|
|
err = platform_device_add_resources(pdev, &res, 1);
|
|
if (err) {
|
|
pr_err("Device resource addition failed (%d)\n", err);
|
|
goto exit_device_put;
|
|
}
|
|
|
|
err = platform_device_add(pdev);
|
|
if (err) {
|
|
pr_err("Device addition failed (%d)\n", err);
|
|
goto exit_device_put;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_device_put:
|
|
platform_device_put(pdev);
|
|
exit:
|
|
pdev = NULL;
|
|
return err;
|
|
}
|
|
|
|
static int __init lm78_isa_register(void)
|
|
{
|
|
int res;
|
|
|
|
if (lm78_isa_found(isa_address)) {
|
|
res = platform_driver_register(&lm78_isa_driver);
|
|
if (res)
|
|
goto exit;
|
|
|
|
/* Sets global pdev as a side effect */
|
|
res = lm78_isa_device_add(isa_address);
|
|
if (res)
|
|
goto exit_unreg_isa_driver;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_unreg_isa_driver:
|
|
platform_driver_unregister(&lm78_isa_driver);
|
|
exit:
|
|
return res;
|
|
}
|
|
|
|
static void lm78_isa_unregister(void)
|
|
{
|
|
if (pdev) {
|
|
platform_device_unregister(pdev);
|
|
platform_driver_unregister(&lm78_isa_driver);
|
|
}
|
|
}
|
|
#else /* !CONFIG_ISA */
|
|
|
|
static int __init lm78_isa_register(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void lm78_isa_unregister(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_ISA */
|
|
|
|
static int __init sm_lm78_init(void)
|
|
{
|
|
int res;
|
|
|
|
/*
|
|
* We register the ISA device first, so that we can skip the
|
|
* registration of an I2C interface to the same device.
|
|
*/
|
|
res = lm78_isa_register();
|
|
if (res)
|
|
goto exit;
|
|
|
|
res = i2c_add_driver(&lm78_driver);
|
|
if (res)
|
|
goto exit_unreg_isa_device;
|
|
|
|
return 0;
|
|
|
|
exit_unreg_isa_device:
|
|
lm78_isa_unregister();
|
|
exit:
|
|
return res;
|
|
}
|
|
|
|
static void __exit sm_lm78_exit(void)
|
|
{
|
|
lm78_isa_unregister();
|
|
i2c_del_driver(&lm78_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <khali@linux-fr.org>");
|
|
MODULE_DESCRIPTION("LM78/LM79 driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sm_lm78_init);
|
|
module_exit(sm_lm78_exit);
|