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1033 lines
27 KiB
1033 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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* Copyright (c) 2007, 2011 Jean Delvare <[email protected]> |
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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 = clamp_val(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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if (rpm > 1350000) |
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return 1; |
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return clamp_val((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(long val) |
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{ |
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int nval = clamp_val(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 mutex lock; |
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enum chips type; |
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|
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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 in_show(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 in_min_show(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 in_max_show(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 in_min_store(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 in_max_store(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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static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0); |
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static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); |
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static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); |
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static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1); |
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static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); |
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static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); |
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static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2); |
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static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); |
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static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); |
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static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3); |
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static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); |
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static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); |
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static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4); |
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static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); |
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static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); |
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static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5); |
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static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); |
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static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); |
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static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6); |
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static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); |
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static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); |
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/* Temperature */ |
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static ssize_t temp1_input_show(struct device *dev, |
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struct device_attribute *da, 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 temp1_max_show(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 temp1_max_store(struct device *dev, |
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struct device_attribute *da, const char *buf, |
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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 temp1_max_hyst_show(struct device *dev, |
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struct device_attribute *da, 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 temp1_max_hyst_store(struct device *dev, |
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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_RO(temp1_input); |
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static DEVICE_ATTR_RW(temp1_max); |
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static DEVICE_ATTR_RW(temp1_max_hyst); |
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/* 3 Fans */ |
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static ssize_t fan_show(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 fan_min_show(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 fan_min_store(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 fan_div_show(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 fan_div_store(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, |
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"fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", |
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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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static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); |
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static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); |
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static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); |
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static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); |
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static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2); |
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static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2); |
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/* Fan 3 divisor is locked in H/W */ |
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static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); |
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static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); |
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static SENSOR_DEVICE_ATTR_RO(fan3_div, fan_div, 2); |
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|
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/* VID */ |
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static ssize_t cpu0_vid_show(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_RO(cpu0_vid); |
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|
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/* Alarms */ |
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static ssize_t alarms_show(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_RO(alarms); |
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static ssize_t alarm_show(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_RO(in0_alarm, alarm, 0); |
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static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); |
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static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); |
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static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); |
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static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8); |
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static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9); |
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static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 10); |
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static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6); |
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static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7); |
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static SENSOR_DEVICE_ATTR_RO(fan3_alarm, alarm, 11); |
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static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4); |
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|
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static struct attribute *lm78_attrs[] = { |
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&sensor_dev_attr_in0_input.dev_attr.attr, |
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&sensor_dev_attr_in0_min.dev_attr.attr, |
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&sensor_dev_attr_in0_max.dev_attr.attr, |
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&sensor_dev_attr_in0_alarm.dev_attr.attr, |
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&sensor_dev_attr_in1_input.dev_attr.attr, |
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&sensor_dev_attr_in1_min.dev_attr.attr, |
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&sensor_dev_attr_in1_max.dev_attr.attr, |
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&sensor_dev_attr_in1_alarm.dev_attr.attr, |
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&sensor_dev_attr_in2_input.dev_attr.attr, |
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&sensor_dev_attr_in2_min.dev_attr.attr, |
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&sensor_dev_attr_in2_max.dev_attr.attr, |
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&sensor_dev_attr_in2_alarm.dev_attr.attr, |
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&sensor_dev_attr_in3_input.dev_attr.attr, |
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&sensor_dev_attr_in3_min.dev_attr.attr, |
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&sensor_dev_attr_in3_max.dev_attr.attr, |
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&sensor_dev_attr_in3_alarm.dev_attr.attr, |
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&sensor_dev_attr_in4_input.dev_attr.attr, |
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&sensor_dev_attr_in4_min.dev_attr.attr, |
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&sensor_dev_attr_in4_max.dev_attr.attr, |
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&sensor_dev_attr_in4_alarm.dev_attr.attr, |
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&sensor_dev_attr_in5_input.dev_attr.attr, |
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&sensor_dev_attr_in5_min.dev_attr.attr, |
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&sensor_dev_attr_in5_max.dev_attr.attr, |
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&sensor_dev_attr_in5_alarm.dev_attr.attr, |
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&sensor_dev_attr_in6_input.dev_attr.attr, |
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&sensor_dev_attr_in6_min.dev_attr.attr, |
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&sensor_dev_attr_in6_max.dev_attr.attr, |
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&sensor_dev_attr_in6_alarm.dev_attr.attr, |
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&dev_attr_temp1_input.attr, |
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&dev_attr_temp1_max.attr, |
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&dev_attr_temp1_max_hyst.attr, |
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&sensor_dev_attr_temp1_alarm.dev_attr.attr, |
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&sensor_dev_attr_fan1_input.dev_attr.attr, |
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&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 |
|
}; |
|
|
|
ATTRIBUTE_GROUPS(lm78); |
|
|
|
/* |
|
* ISA related code |
|
*/ |
|
#ifdef CONFIG_ISA |
|
|
|
/* ISA device, if found */ |
|
static struct platform_device *pdev; |
|
|
|
static unsigned short isa_address = 0x290; |
|
|
|
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 const struct i2c_device_id lm78_i2c_id[]; |
|
|
|
static int lm78_i2c_probe(struct i2c_client *client) |
|
{ |
|
struct device *dev = &client->dev; |
|
struct device *hwmon_dev; |
|
struct lm78_data *data; |
|
|
|
data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
data->client = client; |
|
data->type = i2c_match_id(lm78_i2c_id, client)->driver_data; |
|
|
|
/* Initialize the LM78 chip */ |
|
lm78_init_device(data); |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
|
data, lm78_groups); |
|
return PTR_ERR_OR_ZERO(hwmon_dev); |
|
} |
|
|
|
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_new = lm78_i2c_probe, |
|
.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 lm78_isa_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct device *hwmon_dev; |
|
struct lm78_data *data; |
|
struct resource *res; |
|
|
|
/* Reserve the ISA region */ |
|
res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
|
if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET, |
|
2, "lm78")) |
|
return -EBUSY; |
|
|
|
data = devm_kzalloc(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); |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name, |
|
data, lm78_groups); |
|
return PTR_ERR_OR_ZERO(hwmon_dev); |
|
} |
|
|
|
static struct platform_driver lm78_isa_driver = { |
|
.driver = { |
|
.name = "lm78", |
|
}, |
|
.probe = lm78_isa_probe, |
|
}; |
|
|
|
/* 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 <[email protected]>"); |
|
MODULE_DESCRIPTION("LM78/LM79 driver"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
module_init(sm_lm78_init); |
|
module_exit(sm_lm78_exit);
|
|
|