/* * 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 * http://www.analog.com/UploadedFiles/Data_Sheets/115254175ADT7467_pra.pdf * http://www.analog.com/UploadedFiles/Data_Sheets/3686221171167ADT7460_b.pdf * */ #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 <asm/prom.h> #include <asm/machdep.h> #include <asm/io.h> #include <asm/system.h> #include <asm/sections.h> #include <asm/of_platform.h> #undef DEBUG #define CONFIG_REG 0x40 #define MANUAL_MASK 0xe0 #define AUTO_MASK 0x20 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 int 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]; }; static enum {ADT7460, ADT7467} therm_type; static int therm_bus, therm_address; static struct of_device * of_dev; static struct thermostat* thermostat; static struct task_struct *thread_therm = NULL; static int attach_one_thermostat(struct i2c_adapter *adapter, int addr, int busno); 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 attach_thermostat(struct i2c_adapter *adapter) { unsigned long bus_no; if (strncmp(adapter->name, "uni-n", 5)) return -ENODEV; bus_no = simple_strtoul(adapter->name + 6, NULL, 10); if (bus_no != therm_bus) return -ENODEV; return attach_one_thermostat(adapter, therm_address, bus_no); } static int detach_thermostat(struct i2c_adapter *adapter) { struct thermostat* th; int i; if (thermostat == NULL) return 0; th = thermostat; if (thread_therm != NULL) { kthread_stop(thread_therm); } 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); i2c_detach_client(&th->clt); thermostat = NULL; kfree(th); return 0; } static struct i2c_driver thermostat_driver = { .driver = { .name = "therm_adt746x", }, .attach_adapter = attach_thermostat, .detach_adapter = detach_thermostat, }; 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 (therm_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 (therm_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]); write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK); write_reg(th, FAN_SPD_SET[fan], speed); } else { /* back to automatic */ if(therm_type == ADT7460) { manual = read_reg(th, MANUAL_MODE[fan]) & (~MANUAL_MASK); write_reg(th, MANUAL_MODE[fan], manual|REM_CONTROL[fan]); } else { manual = read_reg(th, MANUAL_MODE[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++) { int started = 0; int fan_number = (therm_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 = 1; 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; } static int attach_one_thermostat(struct i2c_adapter *adapter, int addr, int busno) { struct thermostat* th; int rc; int i; if (thermostat) return 0; th = kzalloc(sizeof(struct thermostat), GFP_KERNEL); if (!th) return -ENOMEM; th->clt.addr = addr; th->clt.adapter = adapter; th->clt.driver = &thermostat_driver; strcpy(th->clt.name, "thermostat"); rc = read_reg(th, 0); if (rc < 0) { printk(KERN_ERR "adt746x: Thermostat failed to read config " "from bus %d !\n", busno); kfree(th); return -ENODEV; } /* force manual control to start the fan quieter */ if (fan_speed == -1) fan_speed = 64; if(therm_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]); thermostat = th; if (i2c_attach_client(&th->clt)) { printk(KERN_INFO "adt746x: Thermostat failed to attach " "client !\n"); thermostat = NULL; kfree(th); return -ENODEV; } /* 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); } thread_therm = kthread_run(monitor_task, th, "kfand"); if (thread_therm == ERR_PTR(-ENOMEM)) { printk(KERN_INFO "adt746x: Kthread creation failed\n"); thread_therm = NULL; return -ENOMEM; } return 0; } /* * Now, unfortunately, sysfs doesn't give us a nice void * we could * pass around to the attribute functions, so we don't really have * choice but implement a bunch of them... * * FIXME, it does now... */ #define BUILD_SHOW_FUNC_INT(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) \ { \ return sprintf(buf, "%d (%d rpm)\n", \ thermostat->last_speed[data], \ read_fan_speed(thermostat, 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) \ { \ 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(thermostat, 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) \ { \ u32 val; \ val = simple_strtoul(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(thermostat, TEMP_REG[1]))) BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(thermostat, TEMP_REG[2]))) BUILD_SHOW_FUNC_INT(sensor1_limit, thermostat->limits[1]) BUILD_SHOW_FUNC_INT(sensor2_limit, thermostat->limits[2]) BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1]) BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2]) BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed) BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0) BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1) BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed) BUILD_SHOW_FUNC_INT(limit_adjust, limit_adjust) BUILD_STORE_FUNC_DEG(limit_adjust, thermostat) 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 int __init thermostat_init(void) { struct device_node* np; const u32 *prop; int i = 0, offset = 0; int err; np = of_find_node_by_name(NULL, "fan"); if (!np) return -ENODEV; if (of_device_is_compatible(np, "adt7460")) therm_type = ADT7460; else if (of_device_is_compatible(np, "adt7467")) therm_type = ADT7467; else return -ENODEV; prop = of_get_property(np, "hwsensor-params-version", NULL); printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop, (*prop == 1)?"":"un"); if (*prop != 1) return -ENODEV; prop = of_get_property(np, "reg", NULL); if (!prop) return -ENODEV; /* look for bus either by path or using "reg" */ if (strstr(np->full_name, "/i2c-bus@") != NULL) { const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9); therm_bus = tmp_bus[0]-'0'; } else { therm_bus = ((*prop) >> 8) & 0x0f; } therm_address = ((*prop) & 0xff) >> 1; printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, " "limit_adjust: %d, fan_speed: %d\n", therm_bus, therm_address, limit_adjust, fan_speed); 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; } } else { sensor_location[0] = "?"; sensor_location[1] = "?"; sensor_location[2] = "?"; } of_dev = of_platform_device_create(np, "temperatures", NULL); if (of_dev == NULL) { printk(KERN_ERR "Can't register temperatures device !\n"); return -ENODEV; } err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature); err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature); err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit); err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit); err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location); err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location); err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust); err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed); err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed); if(therm_type == ADT7460) err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed); if (err) printk(KERN_WARNING "Failed to create tempertaure attribute file(s).\n"); #ifndef CONFIG_I2C_POWERMAC request_module("i2c-powermac"); #endif return i2c_add_driver(&thermostat_driver); } static void __exit thermostat_exit(void) { if (of_dev) { device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature); device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature); device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit); device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit); device_remove_file(&of_dev->dev, &dev_attr_sensor1_location); device_remove_file(&of_dev->dev, &dev_attr_sensor2_location); device_remove_file(&of_dev->dev, &dev_attr_limit_adjust); device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed); device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed); if(therm_type == ADT7460) device_remove_file(&of_dev->dev, &dev_attr_sensor2_fan_speed); of_device_unregister(of_dev); } i2c_del_driver(&thermostat_driver); } module_init(thermostat_init); module_exit(thermostat_exit);