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Diffstat (limited to 'drivers/macintosh/therm_adt746x.c')
-rw-r--r--drivers/macintosh/therm_adt746x.c612
1 files changed, 612 insertions, 0 deletions
diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
new file mode 100644
index 000000000000..e0ac63effa55
--- /dev/null
+++ b/drivers/macintosh/therm_adt746x.c
@@ -0,0 +1,612 @@
+/*
+ * 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/config.h>
+#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/smp_lock.h>
+#include <linux/wait.h>
+#include <linux/suspend.h>
+#include <linux/kthread.h>
+#include <linux/moduleparam.h>
+
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/sections.h>
+#include <asm/of_device.h>
+
+#undef DEBUG
+
+#define CONFIG_REG 0x40
+#define MANUAL_MASK 0xe0
+#define AUTO_MASK 0x20
+
+static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, cpu, gpu */
+static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, cpu, gpu */
+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, cpu, gpu */
+static u8 default_limits_chip[3] = {80, 65, 80}; /* local, cpu, gpu */
+
+static int limit_adjust = 0;
+static int fan_speed = -1;
+
+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 cpu, 70 gpu) "
+ "by N degrees.");
+
+module_param(fan_speed, int, 0644);
+MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
+ "(default 64)");
+
+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, &reg_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 = {
+ .owner = THIS_MODULE,
+ .name = "therm_adt746x",
+ .flags = I2C_DF_NOTIFY,
+ .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 (speed == -1)
+ printk(KERN_DEBUG "adt746x: Setting speed to automatic "
+ "for %s fan.\n", fan?"GPU":"CPU");
+ else
+ printk(KERN_DEBUG "adt746x: Setting speed to %d "
+ "for %s fan.\n", speed, fan?"GPU":"CPU");
+ } 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;
+
+ printk(KERN_DEBUG "adt746x: setting fans speed to %d "
+ "(limit exceeded by %d on %s) \n",
+ new_speed, var,
+ fan_number?"GPU/pwr":"CPU");
+ write_both_fan_speed(th, new_speed);
+ th->last_var[fan_number] = var;
+ } else if (var < -2) {
+ /* don't stop fan if GPU/power is cold and CPU is not
+ * so cold (lastvar >= -1) */
+ if (i == 2 && lastvar < -1) {
+ if (th->last_speed[fan_number] != 0)
+ 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 CPU is heating and GPU/power is not */
+ }
+}
+
+static int monitor_task(void *arg)
+{
+ struct thermostat* th = arg;
+
+ while(!kthread_should_stop()) {
+ if (current->flags & PF_FREEZE)
+ refrigerator(PF_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 CPU 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 = (struct thermostat *)
+ kmalloc(sizeof(struct thermostat), GFP_KERNEL);
+
+ if (!th)
+ return -ENOMEM;
+
+ memset(th, 0, sizeof(*th));
+ 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...
+ *
+ */
+#define BUILD_SHOW_FUNC_INT(name, data) \
+static ssize_t show_##name(struct device *dev, char *buf) \
+{ \
+ return sprintf(buf, "%d\n", data); \
+}
+
+#define BUILD_SHOW_FUNC_FAN(name, data) \
+static ssize_t show_##name(struct device *dev, 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, const char *buf, size_t n) \
+{ \
+ int val; \
+ int i; \
+ val = simple_strtol(buf, NULL, 10); \
+ printk(KERN_INFO "Adjusting limits by %d°C\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, 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(cpu_temperature, (read_reg(thermostat, TEMP_REG[1])))
+BUILD_SHOW_FUNC_INT(gpu_temperature, (read_reg(thermostat, TEMP_REG[2])))
+BUILD_SHOW_FUNC_INT(cpu_limit, thermostat->limits[1])
+BUILD_SHOW_FUNC_INT(gpu_limit, thermostat->limits[2])
+
+BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
+BUILD_SHOW_FUNC_FAN(cpu_fan_speed, 0)
+BUILD_SHOW_FUNC_FAN(gpu_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(cpu_temperature, S_IRUGO,
+ show_cpu_temperature,NULL);
+static DEVICE_ATTR(gpu_temperature, S_IRUGO,
+ show_gpu_temperature,NULL);
+static DEVICE_ATTR(cpu_limit, S_IRUGO,
+ show_cpu_limit, NULL);
+static DEVICE_ATTR(gpu_limit, S_IRUGO,
+ show_gpu_limit, 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(cpu_fan_speed, S_IRUGO,
+ show_cpu_fan_speed, NULL);
+static DEVICE_ATTR(gpu_fan_speed, S_IRUGO,
+ show_gpu_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;
+ u32 *prop;
+
+ np = of_find_node_by_name(NULL, "fan");
+ if (!np)
+ return -ENODEV;
+ if (device_is_compatible(np, "adt7460"))
+ therm_type = ADT7460;
+ else if (device_is_compatible(np, "adt7467"))
+ therm_type = ADT7467;
+ else
+ return -ENODEV;
+
+ prop = (u32 *)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);
+
+ of_dev = of_platform_device_create(np, "temperatures");
+
+ if (of_dev == NULL) {
+ printk(KERN_ERR "Can't register temperatures device !\n");
+ return -ENODEV;
+ }
+
+ device_create_file(&of_dev->dev, &dev_attr_cpu_temperature);
+ device_create_file(&of_dev->dev, &dev_attr_gpu_temperature);
+ device_create_file(&of_dev->dev, &dev_attr_cpu_limit);
+ device_create_file(&of_dev->dev, &dev_attr_gpu_limit);
+ device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
+ device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
+ device_create_file(&of_dev->dev, &dev_attr_cpu_fan_speed);
+ if(therm_type == ADT7460)
+ device_create_file(&of_dev->dev, &dev_attr_gpu_fan_speed);
+
+#ifndef CONFIG_I2C_KEYWEST
+ request_module("i2c-keywest");
+#endif
+
+ return i2c_add_driver(&thermostat_driver);
+}
+
+static void __exit
+thermostat_exit(void)
+{
+ if (of_dev) {
+ device_remove_file(&of_dev->dev, &dev_attr_cpu_temperature);
+ device_remove_file(&of_dev->dev, &dev_attr_gpu_temperature);
+ device_remove_file(&of_dev->dev, &dev_attr_cpu_limit);
+ device_remove_file(&of_dev->dev, &dev_attr_gpu_limit);
+ 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_cpu_fan_speed);
+
+ if(therm_type == ADT7460)
+ device_remove_file(&of_dev->dev,
+ &dev_attr_gpu_fan_speed);
+
+ of_device_unregister(of_dev);
+ }
+ i2c_del_driver(&thermostat_driver);
+}
+
+module_init(thermostat_init);
+module_exit(thermostat_exit);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 23:40:28 +0000