Subject: [PATCH] [acpi thermal] Add basic structure to new thermal driver

- Declare and register ACPI driver
- No proc, sysfs, or event interfaces
- Do simple init (get initial temperature)
- Add helpers to get temp and convert to C

Signed-off-by: Patrick Mochel <mochel@linux.intel.com>

---

 drivers/acpi/drivers/thermal/device.c  |   32 +++++++++++++++++
 drivers/acpi/drivers/thermal/driver.c  |   59 ++++++++++++++++++++++++++++++++
 drivers/acpi/drivers/thermal/event.c   |    1 +
 drivers/acpi/drivers/thermal/proc.c    |    1 +
 drivers/acpi/drivers/thermal/sysfs.c   |    1 +
 drivers/acpi/drivers/thermal/thermal.h |   10 +++++
 6 files changed, 104 insertions(+), 0 deletions(-)

applies-to: 5b39529d246e174f0ebc8376d222501cb4ce9dfb
9f1f19477f62851fefc40c68ffd3ecbd62c25cc3
diff --git a/drivers/acpi/drivers/thermal/device.c b/drivers/acpi/drivers/thermal/device.c
index 80bbdd7..87db2ba 100644
--- a/drivers/acpi/drivers/thermal/device.c
+++ b/drivers/acpi/drivers/thermal/device.c
@@ -13,3 +13,35 @@
 
 #include "thermal.h"
 
+
+static int get_int(struct acpi_thermal * at, char * obj, unsigned long * val)
+{
+	acpi_status status;
+
+	status = acpi_evaluate_integer(at->t_ad->acpi_device->handle,
+				       obj, NULL, val);
+	return ACPI_SUCCESS(status) ? 0 : -ENODEV;
+}
+
+
+long thermal_temp_c(long tempk)
+{
+	if (tempk - 2732 >= 0)
+		return (tempk - 2732 + 5) / 10;
+	else
+		return (tempk - 2732 - 5) / 10;
+}
+
+
+int thermal_get_temp(struct acpi_thermal * at)
+{
+	unsigned long last_temp = at->t_temp;
+	int ret;
+
+	ret = get_int(at, "_TMP", &at->t_temp);
+	if (!ret) {
+		at->t_last_temp = last_temp;
+		dbg("temperature is %lu dK", at->t_temp);
+	}
+	return ret;
+}
diff --git a/drivers/acpi/drivers/thermal/driver.c b/drivers/acpi/drivers/thermal/driver.c
index 8b7faad..d19c8a6 100644
--- a/drivers/acpi/drivers/thermal/driver.c
+++ b/drivers/acpi/drivers/thermal/driver.c
@@ -13,3 +13,62 @@
 
 #include "thermal.h"
 
+
+static int thermal_init(struct acpi_thermal * at)
+{
+	int ret;
+
+	/*
+	 * Get initial temperature
+	 */
+	ret = thermal_get_temp(at);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int thermal_add(struct acpi_dev * ad)
+{
+	struct acpi_thermal * at;
+	int ret = 0;
+
+	at = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
+	if (!at)
+		return -ENOMEM;
+
+	at->t_ad = ad;
+
+	ret = thermal_init(at);
+	if (ret) {
+		kfree(at);
+		return ret;
+	}
+
+	dev_set_drvdata(&ad->dev, at);
+
+	printk(KERN_INFO PREFIX "thermal [%s] (%ld C)\n",
+	       acpi_dev_bid(ad), thermal_temp_c(at->t_temp));
+
+	return ret;
+}
+
+static int thermal_remove(struct acpi_dev * ad)
+{	
+	struct acpi_thermal * at = dev_get_drvdata(&ad->dev);
+	dev_set_drvdata(&ad->dev, NULL);
+	kfree(at);
+	return 0;
+}
+
+acpi_no_start(thermal);
+acpi_no_stop(thermal);
+acpi_no_shutdown(thermal);
+acpi_no_suspend(thermal);
+acpi_no_resume(thermal);
+
+declare_acpi_driver(thermal);
+
+MODULE_AUTHOR("Patrick Mochel");
+MODULE_DESCRIPTION("ACPI Thermal Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/acpi/drivers/thermal/event.c b/drivers/acpi/drivers/thermal/event.c
index 30c9413..06e2e32 100644
--- a/drivers/acpi/drivers/thermal/event.c
+++ b/drivers/acpi/drivers/thermal/event.c
@@ -13,3 +13,4 @@
 
 #include "thermal.h"
 
+acpi_device_event_none(thermal);
diff --git a/drivers/acpi/drivers/thermal/proc.c b/drivers/acpi/drivers/thermal/proc.c
index 7618282..9454df4 100644
--- a/drivers/acpi/drivers/thermal/proc.c
+++ b/drivers/acpi/drivers/thermal/proc.c
@@ -13,3 +13,4 @@
 
 #include "thermal.h"
 
+acpi_driver_proc_none(thermal);
diff --git a/drivers/acpi/drivers/thermal/sysfs.c b/drivers/acpi/drivers/thermal/sysfs.c
index 03802fd..d36c228 100644
--- a/drivers/acpi/drivers/thermal/sysfs.c
+++ b/drivers/acpi/drivers/thermal/sysfs.c
@@ -8,3 +8,4 @@
 
 #include "thermal.h"
 
+acpi_driver_sysfs_none(thermal);
diff --git a/drivers/acpi/drivers/thermal/thermal.h b/drivers/acpi/drivers/thermal/thermal.h
index 269a8fb..758d7e6 100644
--- a/drivers/acpi/drivers/thermal/thermal.h
+++ b/drivers/acpi/drivers/thermal/thermal.h
@@ -13,3 +13,13 @@ ACPI_MODULE_NAME("acpi_thermal");
 
 #define ACPI_THERMAL_HID	"ACPI_THM"
 
+
+struct acpi_thermal {
+	struct acpi_dev		* t_ad;
+	long			t_temp;
+	long			t_last_temp;
+};
+
+extern int thermal_get_temp(struct acpi_thermal *);
+
+extern long thermal_temp_c(long tempk);
---
0.99.9.GIT