efm32.rar_EFM32_The Power

/* * A hwmon driver for the Analog Devices ADT7470 * Copyright (C) 2007 IBM * * Author: Darrick J. Wong <darrick.wong@oracle.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/delay.h> #include <linux/log2.h> #include <linux/kthread.h> #include <linux/slab.h> /* Addresses to scan */ static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END }; /* ADT7470 registers */ #define ADT7470_REG_BASE_ADDR 0x20 #define ADT7470_REG_TEMP_BASE_ADDR 0x20 #define ADT7470_REG_TEMP_MAX_ADDR 0x29 #define ADT7470_REG_FAN_BASE_ADDR 0x2A #define ADT7470_REG_FAN_MAX_ADDR 0x31 #define ADT7470_REG_PWM_BASE_ADDR 0x32 #define ADT7470_REG_PWM_MAX_ADDR 0x35 #define ADT7470_REG_PWM_MAX_BASE_ADDR 0x38 #define ADT7470_REG_PWM_MAX_MAX_ADDR 0x3B #define ADT7470_REG_CFG 0x40 #define ADT7470_FSPD_MASK 0x04 #define ADT7470_REG_ALARM1 0x41 #define ADT7470_R1T_ALARM 0x01 #define ADT7470_R2T_ALARM 0x02 #define ADT7470_R3T_ALARM 0x04 #define ADT7470_R4T_ALARM 0x08 #define ADT7470_R5T_ALARM 0x10 #define ADT7470_R6T_ALARM 0x20 #define ADT7470_R7T_ALARM 0x40 #define ADT7470_OOL_ALARM 0x80 #define ADT7470_REG_ALARM2 0x42 #define ADT7470_R8T_ALARM 0x01 #define ADT7470_R9T_ALARM 0x02 #define ADT7470_R10T_ALARM 0x04 #define ADT7470_FAN1_ALARM 0x10 #define ADT7470_FAN2_ALARM 0x20 #define ADT7470_FAN3_ALARM 0x40 #define ADT7470_FAN4_ALARM 0x80 #define ADT7470_REG_TEMP_LIMITS_BASE_ADDR 0x44 #define ADT7470_REG_TEMP_LIMITS_MAX_ADDR 0x57 #define ADT7470_REG_FAN_MIN_BASE_ADDR 0x58 #define ADT7470_REG_FAN_MIN_MAX_ADDR 0x5F #define ADT7470_REG_FAN_MAX_BASE_ADDR 0x60 #define ADT7470_REG_FAN_MAX_MAX_ADDR 0x67 #define ADT7470_REG_PWM_CFG_BASE_ADDR 0x68 #define ADT7470_REG_PWM12_CFG 0x68 #define ADT7470_PWM2_AUTO_MASK 0x40 #define ADT7470_PWM1_AUTO_MASK 0x80 #define ADT7470_PWM_AUTO_MASK 0xC0 #define ADT7470_REG_PWM34_CFG 0x69 #define ADT7470_PWM3_AUTO_MASK 0x40 #define ADT7470_PWM4_AUTO_MASK 0x80 #define ADT7470_REG_PWM_MIN_BASE_ADDR 0x6A #define ADT7470_REG_PWM_MIN_MAX_ADDR 0x6D #define ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR 0x6E #define ADT7470_REG_PWM_TEMP_MIN_MAX_ADDR 0x71 #define ADT7470_REG_ACOUSTICS12 0x75 #define ADT7470_REG_ACOUSTICS34 0x76 #define ADT7470_REG_DEVICE 0x3D #define ADT7470_REG_VENDOR 0x3E #define ADT7470_REG_REVISION 0x3F #define ADT7470_REG_ALARM1_MASK 0x72 #define ADT7470_REG_ALARM2_MASK 0x73 #define ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR 0x7C #define ADT7470_REG_PWM_AUTO_TEMP_MAX_ADDR 0x7D #define ADT7470_REG_MAX_ADDR 0x81 #define ADT7470_TEMP_COUNT 10 #define ADT7470_TEMP_REG(x) (ADT7470_REG_TEMP_BASE_ADDR + (x)) #define ADT7470_TEMP_MIN_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + ((x) * 2)) #define ADT7470_TEMP_MAX_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + \ ((x) * 2) + 1) #define ADT7470_FAN_COUNT 4 #define ADT7470_REG_FAN(x) (ADT7470_REG_FAN_BASE_ADDR + ((x) * 2)) #define ADT7470_REG_FAN_MIN(x) (ADT7470_REG_FAN_MIN_BASE_ADDR + ((x) * 2)) #define ADT7470_REG_FAN_MAX(x) (ADT7470_REG_FAN_MAX_BASE_ADDR + ((x) * 2)) #define ADT7470_PWM_COUNT 4 #define ADT7470_REG_PWM(x) (ADT7470_REG_PWM_BASE_ADDR + (x)) #define ADT7470_REG_PWM_MAX(x) (ADT7470_REG_PWM_MAX_BASE_ADDR + (x)) #define ADT7470_REG_PWM_MIN(x) (ADT7470_REG_PWM_MIN_BASE_ADDR + (x)) #define ADT7470_REG_PWM_TMIN(x) (ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR + (x)) #define ADT7470_REG_PWM_CFG(x) (ADT7470_REG_PWM_CFG_BASE_ADDR + ((x) / 2)) #define ADT7470_REG_PWM_AUTO_TEMP(x) (ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR + \ ((x) / 2)) #define ALARM2(x) ((x) << 8) #define ADT7470_VENDOR 0x41 #define ADT7470_DEVICE 0x70 /* datasheet only mentions a revision 2 */ #define ADT7470_REVISION 0x02 /* "all temps" according to hwmon sysfs interface spec */ #define ADT7470_PWM_ALL_TEMPS 0x3FF /* How often do we reread sensors values? (In jiffies) */ #define SENSOR_REFRESH_INTERVAL (5 * HZ) /* How often do we reread sensor limit values? (In jiffies) */ #define LIMIT_REFRESH_INTERVAL (60 * HZ) /* Wait at least 200ms per sensor for 10 sensors */ #define TEMP_COLLECTION_TIME 2000 /* auto update thing won't fire more than every 2s */ #define AUTO_UPDATE_INTERVAL 2000 /* datasheet says to divide this number by the fan reading to get fan rpm */ #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM #define FAN_PERIOD_INVALID 65535 #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID) struct adt7470_data { struct i2c_client *client; struct mutex lock; char sensors_valid; char limits_valid; unsigned long sensors_last_updated; /* In jiffies */ unsigned long limits_last_updated; /* In jiffies */ int num_temp_sensors; /* -1 = probe */ int temperatures_probed; s8 temp[ADT7470_TEMP_COUNT]; s8 temp_min[ADT7470_TEMP_COUNT]; s8 temp_max[ADT7470_TEMP_COUNT]; u16 fan[ADT7470_FAN_COUNT]; u16 fan_min[ADT7470_FAN_COUNT]; u16 fan_max[ADT7470_FAN_COUNT]; u16 alarm; u16 alarms_mask; u8 force_pwm_max; u8 pwm[ADT7470_PWM_COUNT]; u8 pwm_max[ADT7470_PWM_COUNT]; u8 pwm_automatic[ADT7470_PWM_COUNT]; u8 pwm_min[ADT7470_PWM_COUNT]; s8 pwm_tmin[ADT7470_PWM_COUNT]; u8 pwm_auto_temp[ADT7470_PWM_COUNT]; struct task_struct *auto_update; struct completion auto_update_stop; unsigned int auto_update_interval; }; /* * 16-bit registers on the ADT7470 are low-byte first. The data sheet says * that the low byte must be read before the high byte. */ static inline int adt7470_read_word_data(struct i2c_client *client, u8 reg) { u16 foo; foo = i2c_smbus_read_byte_data(client, reg); foo |= ((u16)i2c_smbus_read_byte_data(client, reg + 1) << 8); return foo; } static inline int adt7470_write_word_data(struct i2c_client *client, u8 reg, u16 value) { return i2c_smbus_write_byte_data(client, reg, value & 0xFF) || i2c_smbus_write_byte_data(client, reg + 1, value >> 8); } /* Probe for temperature sensors. Assumes lock is held */ static int adt7470_read_temperatures(struct i2c_client *client, struct adt7470_data *data) { unsigned long res; int i; u8 cfg, pwm[4], pwm_cfg[2]; /* save pwm[1-4] config register */ pwm_cfg[0] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(0)); pwm_cfg[1] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(2)); /* set manual pwm to whatever it is set to now */ for (i = 0; i < ADT7470_FAN_COUNT; i++) pwm[i] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM(i)); /* put pwm in manual mode */ i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), pwm_cfg[0] & ~(ADT7470_PWM_AUTO_MASK)); i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), pwm_cfg[1] & ~(ADT7470_PWM_AUTO_MASK)); /* write pwm control to whatever it was */ for (i = 0; i < ADT7470_FAN_COUNT; i++) i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(i), pwm[i]); /* start reading temperature sensors */ cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG); cfg |= 0x80; i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg); /* Delay is 200ms * number of temp sensors. */ res = msleep_interruptible((da