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624 lines
16 KiB
624 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Device driver for the i2c thermostat found on the iBook G4, Albook G4 |
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* |
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* Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt |
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* |
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* Documentation from 115254175ADT7467_pra.pdf and 3686221171167ADT7460_b.pdf |
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* https://www.onsemi.com/PowerSolutions/product.do?id=ADT7467 |
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* https://www.onsemi.com/PowerSolutions/product.do?id=ADT7460 |
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* |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/sched.h> |
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#include <linux/i2c.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/spinlock.h> |
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#include <linux/wait.h> |
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#include <linux/suspend.h> |
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#include <linux/kthread.h> |
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#include <linux/moduleparam.h> |
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#include <linux/freezer.h> |
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#include <linux/of_platform.h> |
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#include <asm/prom.h> |
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#include <asm/machdep.h> |
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#include <asm/io.h> |
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#include <asm/sections.h> |
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#undef DEBUG |
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#define CONFIG_REG 0x40 |
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#define MANUAL_MASK 0xe0 |
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#define AUTO_MASK 0x20 |
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#define INVERT_MASK 0x10 |
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static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */ |
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static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */ |
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static u8 MANUAL_MODE[2] = {0x5c, 0x5d}; |
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static u8 REM_CONTROL[2] = {0x00, 0x40}; |
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static u8 FAN_SPEED[2] = {0x28, 0x2a}; |
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static u8 FAN_SPD_SET[2] = {0x30, 0x31}; |
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static u8 default_limits_local[3] = {70, 50, 70}; /* local, sensor1, sensor2 */ |
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static u8 default_limits_chip[3] = {80, 65, 80}; /* local, sensor1, sensor2 */ |
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static const char *sensor_location[3] = { "?", "?", "?" }; |
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static int limit_adjust; |
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static int fan_speed = -1; |
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static bool verbose; |
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MODULE_AUTHOR("Colin Leroy <[email protected]>"); |
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MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and " |
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"Powerbook G4 Alu"); |
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MODULE_LICENSE("GPL"); |
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module_param(limit_adjust, int, 0644); |
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MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) " |
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"by N degrees."); |
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module_param(fan_speed, int, 0644); |
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MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) " |
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"(default 64)"); |
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module_param(verbose, bool, 0); |
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MODULE_PARM_DESC(verbose,"Verbose log operations " |
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"(default 0)"); |
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struct thermostat { |
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struct i2c_client *clt; |
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u8 temps[3]; |
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u8 cached_temp[3]; |
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u8 initial_limits[3]; |
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u8 limits[3]; |
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int last_speed[2]; |
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int last_var[2]; |
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int pwm_inv[2]; |
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struct task_struct *thread; |
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struct platform_device *pdev; |
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enum { |
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ADT7460, |
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ADT7467 |
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} type; |
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}; |
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static void write_both_fan_speed(struct thermostat *th, int speed); |
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static void write_fan_speed(struct thermostat *th, int speed, int fan); |
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static int |
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write_reg(struct thermostat* th, int reg, u8 data) |
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{ |
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u8 tmp[2]; |
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int rc; |
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tmp[0] = reg; |
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tmp[1] = data; |
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rc = i2c_master_send(th->clt, (const char *)tmp, 2); |
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if (rc < 0) |
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return rc; |
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if (rc != 2) |
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return -ENODEV; |
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return 0; |
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} |
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static int |
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read_reg(struct thermostat* th, int reg) |
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{ |
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u8 reg_addr, data; |
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int rc; |
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reg_addr = (u8)reg; |
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rc = i2c_master_send(th->clt, ®_addr, 1); |
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if (rc < 0) |
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return rc; |
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if (rc != 1) |
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return -ENODEV; |
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rc = i2c_master_recv(th->clt, (char *)&data, 1); |
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if (rc < 0) |
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return rc; |
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return data; |
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} |
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static int read_fan_speed(struct thermostat *th, u8 addr) |
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{ |
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u8 tmp[2]; |
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u16 res; |
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/* should start with low byte */ |
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tmp[1] = read_reg(th, addr); |
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tmp[0] = read_reg(th, addr + 1); |
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res = tmp[1] + (tmp[0] << 8); |
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/* "a value of 0xffff means that the fan has stopped" */ |
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return (res == 0xffff ? 0 : (90000*60)/res); |
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} |
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static void write_both_fan_speed(struct thermostat *th, int speed) |
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{ |
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write_fan_speed(th, speed, 0); |
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if (th->type == ADT7460) |
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write_fan_speed(th, speed, 1); |
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} |
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static void write_fan_speed(struct thermostat *th, int speed, int fan) |
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{ |
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u8 manual; |
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if (speed > 0xff) |
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speed = 0xff; |
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else if (speed < -1) |
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speed = 0; |
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if (th->type == ADT7467 && fan == 1) |
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return; |
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if (th->last_speed[fan] != speed) { |
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if (verbose) { |
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if (speed == -1) |
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printk(KERN_DEBUG "adt746x: Setting speed to automatic " |
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"for %s fan.\n", sensor_location[fan+1]); |
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else |
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printk(KERN_DEBUG "adt746x: Setting speed to %d " |
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"for %s fan.\n", speed, sensor_location[fan+1]); |
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} |
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} else |
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return; |
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if (speed >= 0) { |
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manual = read_reg(th, MANUAL_MODE[fan]); |
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manual &= ~INVERT_MASK; |
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write_reg(th, MANUAL_MODE[fan], |
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manual | MANUAL_MASK | th->pwm_inv[fan]); |
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write_reg(th, FAN_SPD_SET[fan], speed); |
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} else { |
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/* back to automatic */ |
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if(th->type == ADT7460) { |
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manual = read_reg(th, |
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MANUAL_MODE[fan]) & (~MANUAL_MASK); |
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manual &= ~INVERT_MASK; |
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manual |= th->pwm_inv[fan]; |
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write_reg(th, |
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MANUAL_MODE[fan], manual|REM_CONTROL[fan]); |
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} else { |
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manual = read_reg(th, MANUAL_MODE[fan]); |
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manual &= ~INVERT_MASK; |
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manual |= th->pwm_inv[fan]; |
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write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK)); |
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} |
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} |
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th->last_speed[fan] = speed; |
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} |
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static void read_sensors(struct thermostat *th) |
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{ |
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int i = 0; |
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for (i = 0; i < 3; i++) |
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th->temps[i] = read_reg(th, TEMP_REG[i]); |
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} |
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#ifdef DEBUG |
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static void display_stats(struct thermostat *th) |
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{ |
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if (th->temps[0] != th->cached_temp[0] |
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|| th->temps[1] != th->cached_temp[1] |
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|| th->temps[2] != th->cached_temp[2]) { |
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printk(KERN_INFO "adt746x: Temperature infos:" |
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" thermostats: %d,%d,%d;" |
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" limits: %d,%d,%d;" |
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" fan speed: %d RPM\n", |
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th->temps[0], th->temps[1], th->temps[2], |
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th->limits[0], th->limits[1], th->limits[2], |
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read_fan_speed(th, FAN_SPEED[0])); |
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} |
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th->cached_temp[0] = th->temps[0]; |
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th->cached_temp[1] = th->temps[1]; |
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th->cached_temp[2] = th->temps[2]; |
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} |
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#endif |
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static void update_fans_speed (struct thermostat *th) |
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{ |
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int lastvar = 0; /* last variation, for iBook */ |
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int i = 0; |
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/* we don't care about local sensor, so we start at sensor 1 */ |
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for (i = 1; i < 3; i++) { |
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bool started = false; |
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int fan_number = (th->type == ADT7460 && i == 2); |
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int var = th->temps[i] - th->limits[i]; |
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if (var > -1) { |
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int step = (255 - fan_speed) / 7; |
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int new_speed = 0; |
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/* hysteresis : change fan speed only if variation is |
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* more than two degrees */ |
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if (abs(var - th->last_var[fan_number]) < 2) |
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continue; |
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started = true; |
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new_speed = fan_speed + ((var-1)*step); |
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if (new_speed < fan_speed) |
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new_speed = fan_speed; |
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if (new_speed > 255) |
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new_speed = 255; |
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if (verbose) |
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printk(KERN_DEBUG "adt746x: Setting fans speed to %d " |
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"(limit exceeded by %d on %s)\n", |
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new_speed, var, |
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sensor_location[fan_number+1]); |
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write_both_fan_speed(th, new_speed); |
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th->last_var[fan_number] = var; |
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} else if (var < -2) { |
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/* don't stop fan if sensor2 is cold and sensor1 is not |
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* so cold (lastvar >= -1) */ |
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if (i == 2 && lastvar < -1) { |
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if (th->last_speed[fan_number] != 0) |
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if (verbose) |
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printk(KERN_DEBUG "adt746x: Stopping " |
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"fans.\n"); |
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write_both_fan_speed(th, 0); |
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} |
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} |
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lastvar = var; |
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if (started) |
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return; /* we don't want to re-stop the fan |
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* if sensor1 is heating and sensor2 is not */ |
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} |
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} |
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static int monitor_task(void *arg) |
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{ |
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struct thermostat* th = arg; |
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set_freezable(); |
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while(!kthread_should_stop()) { |
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try_to_freeze(); |
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msleep_interruptible(2000); |
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#ifndef DEBUG |
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if (fan_speed != -1) |
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read_sensors(th); |
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#else |
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read_sensors(th); |
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#endif |
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if (fan_speed != -1) |
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update_fans_speed(th); |
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#ifdef DEBUG |
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display_stats(th); |
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#endif |
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} |
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return 0; |
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} |
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static void set_limit(struct thermostat *th, int i) |
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{ |
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/* Set sensor1 limit higher to avoid powerdowns */ |
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th->limits[i] = default_limits_chip[i] + limit_adjust; |
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write_reg(th, LIMIT_REG[i], th->limits[i]); |
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/* set our limits to normal */ |
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th->limits[i] = default_limits_local[i] + limit_adjust; |
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} |
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#define BUILD_SHOW_FUNC_INT(name, data) \ |
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static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct thermostat *th = dev_get_drvdata(dev); \ |
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return sprintf(buf, "%d\n", data); \ |
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} |
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#define BUILD_SHOW_FUNC_INT_LITE(name, data) \ |
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static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
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{ \ |
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return sprintf(buf, "%d\n", data); \ |
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} |
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#define BUILD_SHOW_FUNC_STR(name, data) \ |
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static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
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{ \ |
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return sprintf(buf, "%s\n", data); \ |
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} |
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#define BUILD_SHOW_FUNC_FAN(name, data) \ |
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static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct thermostat *th = dev_get_drvdata(dev); \ |
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return sprintf(buf, "%d (%d rpm)\n", \ |
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th->last_speed[data], \ |
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read_fan_speed(th, FAN_SPEED[data]) \ |
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); \ |
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} |
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#define BUILD_STORE_FUNC_DEG(name, data) \ |
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static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ |
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{ \ |
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struct thermostat *th = dev_get_drvdata(dev); \ |
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int val; \ |
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int i; \ |
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val = simple_strtol(buf, NULL, 10); \ |
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printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \ |
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limit_adjust = val; \ |
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for (i=0; i < 3; i++) \ |
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set_limit(th, i); \ |
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return n; \ |
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} |
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#define BUILD_STORE_FUNC_INT(name, data) \ |
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static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \ |
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{ \ |
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int val; \ |
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val = simple_strtol(buf, NULL, 10); \ |
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if (val < 0 || val > 255) \ |
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return -EINVAL; \ |
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printk(KERN_INFO "Setting specified fan speed to %d\n", val); \ |
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data = val; \ |
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return n; \ |
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} |
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BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(th, TEMP_REG[1]))) |
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BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(th, TEMP_REG[2]))) |
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BUILD_SHOW_FUNC_INT(sensor1_limit, th->limits[1]) |
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BUILD_SHOW_FUNC_INT(sensor2_limit, th->limits[2]) |
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BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1]) |
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BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2]) |
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BUILD_SHOW_FUNC_INT_LITE(specified_fan_speed, fan_speed) |
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BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed) |
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BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0) |
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BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1) |
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BUILD_SHOW_FUNC_INT_LITE(limit_adjust, limit_adjust) |
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BUILD_STORE_FUNC_DEG(limit_adjust, th) |
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static DEVICE_ATTR(sensor1_temperature, S_IRUGO, |
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show_sensor1_temperature,NULL); |
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static DEVICE_ATTR(sensor2_temperature, S_IRUGO, |
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show_sensor2_temperature,NULL); |
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static DEVICE_ATTR(sensor1_limit, S_IRUGO, |
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show_sensor1_limit, NULL); |
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static DEVICE_ATTR(sensor2_limit, S_IRUGO, |
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show_sensor2_limit, NULL); |
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static DEVICE_ATTR(sensor1_location, S_IRUGO, |
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show_sensor1_location, NULL); |
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static DEVICE_ATTR(sensor2_location, S_IRUGO, |
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show_sensor2_location, NULL); |
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static DEVICE_ATTR(specified_fan_speed, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, |
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show_specified_fan_speed,store_specified_fan_speed); |
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static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO, |
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show_sensor1_fan_speed, NULL); |
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static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO, |
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show_sensor2_fan_speed, NULL); |
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static DEVICE_ATTR(limit_adjust, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, |
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show_limit_adjust, store_limit_adjust); |
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static void thermostat_create_files(struct thermostat *th) |
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{ |
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struct device_node *np = th->clt->dev.of_node; |
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struct device *dev; |
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int err; |
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/* To maintain ABI compatibility with userspace, create |
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* the old style platform driver and attach the attributes |
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* to it here |
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*/ |
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th->pdev = of_platform_device_create(np, "temperatures", NULL); |
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if (!th->pdev) |
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return; |
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dev = &th->pdev->dev; |
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dev_set_drvdata(dev, th); |
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err = device_create_file(dev, &dev_attr_sensor1_temperature); |
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err |= device_create_file(dev, &dev_attr_sensor2_temperature); |
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err |= device_create_file(dev, &dev_attr_sensor1_limit); |
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err |= device_create_file(dev, &dev_attr_sensor2_limit); |
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err |= device_create_file(dev, &dev_attr_sensor1_location); |
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err |= device_create_file(dev, &dev_attr_sensor2_location); |
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err |= device_create_file(dev, &dev_attr_limit_adjust); |
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err |= device_create_file(dev, &dev_attr_specified_fan_speed); |
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err |= device_create_file(dev, &dev_attr_sensor1_fan_speed); |
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if(th->type == ADT7460) |
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err |= device_create_file(dev, &dev_attr_sensor2_fan_speed); |
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if (err) |
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printk(KERN_WARNING |
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"Failed to create temperature attribute file(s).\n"); |
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} |
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static void thermostat_remove_files(struct thermostat *th) |
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{ |
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struct device *dev; |
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if (!th->pdev) |
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return; |
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dev = &th->pdev->dev; |
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device_remove_file(dev, &dev_attr_sensor1_temperature); |
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device_remove_file(dev, &dev_attr_sensor2_temperature); |
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device_remove_file(dev, &dev_attr_sensor1_limit); |
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device_remove_file(dev, &dev_attr_sensor2_limit); |
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device_remove_file(dev, &dev_attr_sensor1_location); |
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device_remove_file(dev, &dev_attr_sensor2_location); |
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device_remove_file(dev, &dev_attr_limit_adjust); |
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device_remove_file(dev, &dev_attr_specified_fan_speed); |
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device_remove_file(dev, &dev_attr_sensor1_fan_speed); |
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if (th->type == ADT7460) |
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device_remove_file(dev, &dev_attr_sensor2_fan_speed); |
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of_device_unregister(th->pdev); |
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|
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} |
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static int probe_thermostat(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct device_node *np = client->dev.of_node; |
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struct thermostat* th; |
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const __be32 *prop; |
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int i, rc, vers, offset = 0; |
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if (!np) |
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return -ENXIO; |
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prop = of_get_property(np, "hwsensor-params-version", NULL); |
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if (!prop) |
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return -ENXIO; |
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vers = be32_to_cpup(prop); |
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printk(KERN_INFO "adt746x: version %d (%ssupported)\n", |
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vers, vers == 1 ? "" : "un"); |
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if (vers != 1) |
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return -ENXIO; |
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|
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if (of_get_property(np, "hwsensor-location", NULL)) { |
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for (i = 0; i < 3; i++) { |
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sensor_location[i] = of_get_property(np, |
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"hwsensor-location", NULL) + offset; |
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if (sensor_location[i] == NULL) |
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sensor_location[i] = ""; |
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printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]); |
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offset += strlen(sensor_location[i]) + 1; |
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} |
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} |
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th = kzalloc(sizeof(struct thermostat), GFP_KERNEL); |
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if (!th) |
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return -ENOMEM; |
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i2c_set_clientdata(client, th); |
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th->clt = client; |
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th->type = id->driver_data; |
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rc = read_reg(th, CONFIG_REG); |
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if (rc < 0) { |
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dev_err(&client->dev, "Thermostat failed to read config!\n"); |
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kfree(th); |
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return -ENODEV; |
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} |
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/* force manual control to start the fan quieter */ |
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if (fan_speed == -1) |
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fan_speed = 64; |
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if (th->type == ADT7460) { |
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printk(KERN_INFO "adt746x: ADT7460 initializing\n"); |
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/* The 7460 needs to be started explicitly */ |
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write_reg(th, CONFIG_REG, 1); |
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} else |
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printk(KERN_INFO "adt746x: ADT7467 initializing\n"); |
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|
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for (i = 0; i < 3; i++) { |
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th->initial_limits[i] = read_reg(th, LIMIT_REG[i]); |
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set_limit(th, i); |
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} |
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printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d" |
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" to %d, %d, %d\n", |
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th->initial_limits[0], th->initial_limits[1], |
|
th->initial_limits[2], th->limits[0], th->limits[1], |
|
th->limits[2]); |
|
|
|
/* record invert bit status because fw can corrupt it after suspend */ |
|
th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK; |
|
th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK; |
|
|
|
/* be sure to really write fan speed the first time */ |
|
th->last_speed[0] = -2; |
|
th->last_speed[1] = -2; |
|
th->last_var[0] = -80; |
|
th->last_var[1] = -80; |
|
|
|
if (fan_speed != -1) { |
|
/* manual mode, stop fans */ |
|
write_both_fan_speed(th, 0); |
|
} else { |
|
/* automatic mode */ |
|
write_both_fan_speed(th, -1); |
|
} |
|
|
|
th->thread = kthread_run(monitor_task, th, "kfand"); |
|
if (th->thread == ERR_PTR(-ENOMEM)) { |
|
printk(KERN_INFO "adt746x: Kthread creation failed\n"); |
|
th->thread = NULL; |
|
return -ENOMEM; |
|
} |
|
|
|
thermostat_create_files(th); |
|
|
|
return 0; |
|
} |
|
|
|
static int remove_thermostat(struct i2c_client *client) |
|
{ |
|
struct thermostat *th = i2c_get_clientdata(client); |
|
int i; |
|
|
|
thermostat_remove_files(th); |
|
|
|
if (th->thread != NULL) |
|
kthread_stop(th->thread); |
|
|
|
printk(KERN_INFO "adt746x: Putting max temperatures back from " |
|
"%d, %d, %d to %d, %d, %d\n", |
|
th->limits[0], th->limits[1], th->limits[2], |
|
th->initial_limits[0], th->initial_limits[1], |
|
th->initial_limits[2]); |
|
|
|
for (i = 0; i < 3; i++) |
|
write_reg(th, LIMIT_REG[i], th->initial_limits[i]); |
|
|
|
write_both_fan_speed(th, -1); |
|
|
|
kfree(th); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id therm_adt746x_id[] = { |
|
{ "MAC,adt7460", ADT7460 }, |
|
{ "MAC,adt7467", ADT7467 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, therm_adt746x_id); |
|
|
|
static struct i2c_driver thermostat_driver = { |
|
.driver = { |
|
.name = "therm_adt746x", |
|
}, |
|
.probe = probe_thermostat, |
|
.remove = remove_thermostat, |
|
.id_table = therm_adt746x_id, |
|
}; |
|
|
|
static int __init thermostat_init(void) |
|
{ |
|
#ifndef CONFIG_I2C_POWERMAC |
|
request_module("i2c-powermac"); |
|
#endif |
|
|
|
return i2c_add_driver(&thermostat_driver); |
|
} |
|
|
|
static void __exit thermostat_exit(void) |
|
{ |
|
i2c_del_driver(&thermostat_driver); |
|
} |
|
|
|
module_init(thermostat_init); |
|
module_exit(thermostat_exit);
|
|
|