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