624 lines
16 KiB
C
624 lines
16 KiB
C
/*
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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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* http://www.onsemi.com/PowerSolutions/product.do?id=ADT7467
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* http://www.onsemi.com/PowerSolutions/product.do?id=ADT7460
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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 <colin@colino.net>");
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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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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",
|
|
vers, vers == 1 ? "" : "un");
|
|
if (vers != 1)
|
|
return -ENXIO;
|
|
|
|
if (of_get_property(np, "hwsensor-location", NULL)) {
|
|
for (i = 0; i < 3; i++) {
|
|
sensor_location[i] = of_get_property(np,
|
|
"hwsensor-location", NULL) + offset;
|
|
|
|
if (sensor_location[i] == NULL)
|
|
sensor_location[i] = "";
|
|
|
|
printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
|
|
offset += strlen(sensor_location[i]) + 1;
|
|
}
|
|
}
|
|
|
|
th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
|
|
if (!th)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, th);
|
|
th->clt = client;
|
|
th->type = id->driver_data;
|
|
|
|
rc = read_reg(th, CONFIG_REG);
|
|
if (rc < 0) {
|
|
dev_err(&client->dev, "Thermostat failed to read config!\n");
|
|
kfree(th);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* force manual control to start the fan quieter */
|
|
if (fan_speed == -1)
|
|
fan_speed = 64;
|
|
|
|
if (th->type == ADT7460) {
|
|
printk(KERN_INFO "adt746x: ADT7460 initializing\n");
|
|
/* The 7460 needs to be started explicitly */
|
|
write_reg(th, CONFIG_REG, 1);
|
|
} else
|
|
printk(KERN_INFO "adt746x: ADT7467 initializing\n");
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
|
|
set_limit(th, i);
|
|
}
|
|
|
|
printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
|
|
" to %d, %d, %d\n",
|
|
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);
|