diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/macintosh/therm_adt746x.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/macintosh/therm_adt746x.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/drivers/macintosh/therm_adt746x.c b/ANDROID_3.4.5/drivers/macintosh/therm_adt746x.c new file mode 100644 index 00000000..fc71723c --- /dev/null +++ b/ANDROID_3.4.5/drivers/macintosh/therm_adt746x.c @@ -0,0 +1,695 @@ +/* + * 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]; +}; + +static enum {ADT7460, ADT7467} therm_type; +static int therm_bus, therm_address; +static struct platform_device * of_dev; +static struct thermostat* thermostat; +static struct task_struct *thread_therm = NULL; + +static void write_both_fan_speed(struct thermostat *th, int speed); +static void write_fan_speed(struct thermostat *th, int speed, int fan); +static void thermostat_create_files(void); +static void thermostat_remove_files(void); + +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 struct i2c_driver thermostat_driver; + +static int +attach_thermostat(struct i2c_adapter *adapter) +{ + unsigned long bus_no; + struct i2c_board_info info; + struct i2c_client *client; + + 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; + + memset(&info, 0, sizeof(struct i2c_board_info)); + strlcpy(info.type, "therm_adt746x", I2C_NAME_SIZE); + info.addr = therm_address; + client = i2c_new_device(adapter, &info); + if (!client) + return -ENODEV; + + /* + * Let i2c-core delete that device on driver removal. + * This is safe because i2c-core holds the core_lock mutex for us. + */ + list_add_tail(&client->detected, &thermostat_driver.clients); + return 0; +} + +static int +remove_thermostat(struct i2c_client *client) +{ + struct thermostat *th = i2c_get_clientdata(client); + int i; + + thermostat_remove_files(); + + 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); + + thermostat = NULL; + + kfree(th); + + return 0; +} + +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]); + 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(therm_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++) { + 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 probe_thermostat(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct thermostat* th; + int rc; + int i; + + if (thermostat) + return 0; + + th = kzalloc(sizeof(struct thermostat), GFP_KERNEL); + if (!th) + return -ENOMEM; + + i2c_set_clientdata(client, th); + th->clt = client; + + 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(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; + + /* 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); + } + + 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; + } + + thermostat_create_files(); + + return 0; +} + +static const struct i2c_device_id therm_adt746x_id[] = { + { "therm_adt746x", 0 }, + { } +}; + +static struct i2c_driver thermostat_driver = { + .driver = { + .name = "therm_adt746x", + }, + .attach_adapter = attach_thermostat, + .probe = probe_thermostat, + .remove = remove_thermostat, + .id_table = therm_adt746x_id, +}; + +/* + * 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) \ +{ \ + 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(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; + + 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 { + of_node_put(np); + 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) { + of_node_put(np); + return -ENODEV; + } + + prop = of_get_property(np, "reg", NULL); + if (!prop) { + of_node_put(np); + 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); + of_node_put(np); + + if (of_dev == NULL) { + printk(KERN_ERR "Can't register temperatures device !\n"); + return -ENODEV; + } + +#ifndef CONFIG_I2C_POWERMAC + request_module("i2c-powermac"); +#endif + + return i2c_add_driver(&thermostat_driver); +} + +static void thermostat_create_files(void) +{ + int err; + + 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 temperature attribute file(s).\n"); +} + +static void thermostat_remove_files(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); + + } +} + +static void __exit +thermostat_exit(void) +{ + i2c_del_driver(&thermostat_driver); + of_device_unregister(of_dev); +} + +module_init(thermostat_init); +module_exit(thermostat_exit); |