lis3: solve dependency between core and ACPI

This solves the dependency between lis3lv02d.[ch] and ACPI specific
methods.  It introduces a ->bus_priv pointer to the device struct which is
casted to 'struct acpi_device' in the ACIP layer.  Changed hp_accel.c
accordingly.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 38 insertions, 61 deletions

diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
index de26b1c..55d3dc5 100644
--- a/drivers/hwmon/hp_accel.c
+++ b/drivers/hwmon/hp_accel.c
@@ -85,25 +85,31 @@ MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
 
 /**
  * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
- * @handle: the handle of the device
+ * @lis3: pointer to the device struct
  *
- * Returns AE_OK on success.
+ * Returns 0 on success.
  */
-acpi_status lis3lv02d_acpi_init(acpi_handle handle)
+int lis3lv02d_acpi_init(struct lis3lv02d *lis3)
 {
-	return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
+	struct acpi_device *dev = lis3->bus_priv;
+	if (acpi_evaluate_object(dev->handle, METHOD_NAME__INI,
+				 NULL, NULL) != AE_OK)
+		return -EINVAL;
+
+	return 0;
 }
 
 /**
  * lis3lv02d_acpi_read - ACPI ALRD method: read a register
- * @handle: the handle of the device
+ * @lis3: pointer to the device struct
  * @reg:    the register to read
  * @ret:    result of the operation
  *
- * Returns AE_OK on success.
+ * Returns 0 on success.
  */
-acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
+int lis3lv02d_acpi_read(struct lis3lv02d *lis3, int reg, u8 *ret)
 {
+	struct acpi_device *dev = lis3->bus_priv;
 	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 	struct acpi_object_list args = { 1, &arg0 };
 	unsigned long long lret;
@@ -111,21 +117,22 @@ acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
 
 	arg0.integer.value = reg;
 
-	status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
+	status = acpi_evaluate_integer(dev->handle, "ALRD", &args, &lret);
 	*ret = lret;
-	return status;
+	return (status != AE_OK) ? -EINVAL : 0;
 }
 
 /**
  * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
- * @handle: the handle of the device
+ * @lis3: pointer to the device struct
  * @reg:    the register to write to
  * @val:    the value to write
  *
- * Returns AE_OK on success.
+ * Returns 0 on success.
  */
-acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
+int lis3lv02d_acpi_write(struct lis3lv02d *lis3, int reg, u8 val)
 {
+	struct acpi_device *dev = lis3->bus_priv;
 	unsigned long long ret; /* Not used when writting */
 	union acpi_object in_obj[2];
 	struct acpi_object_list args = { 2, in_obj };
@@ -135,7 +142,10 @@ acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
 	in_obj[1].type          = ACPI_TYPE_INTEGER;
 	in_obj[1].integer.value = val;
 
-	return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
+	if (acpi_evaluate_integer(dev->handle, "ALWR", &args, &ret) != AE_OK)
+		return -EINVAL;
+
+	return 0;
 }
 
 static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
@@ -217,7 +227,7 @@ static struct dmi_system_id lis3lv02d_dmi_ids[] = {
 
 static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
 {
-	acpi_handle handle = lis3_dev.device->handle;
+	struct acpi_device *dev = lis3_dev.bus_priv;
 	unsigned long long ret; /* Not used when writing */
 	union acpi_object in_obj[1];
 	struct acpi_object_list args = { 1, in_obj };
@@ -225,7 +235,7 @@ static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness
 	in_obj[0].type          = ACPI_TYPE_INTEGER;
 	in_obj[0].integer.value = !!value;
 
-	acpi_evaluate_integer(handle, "ALED", &args, &ret);
+	acpi_evaluate_integer(dev->handle, "ALED", &args, &ret);
 }
 
 static struct delayed_led_classdev hpled_led = {
@@ -262,23 +272,6 @@ static void lis3lv02d_enum_resources(struct acpi_device *device)
 		printk(KERN_DEBUG DRIVER_NAME ": Error getting resources\n");
 }
 
-static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
-{
-	u8 lo, hi;
-
-	lis3_dev.read(handle, reg - 1, &lo);
-	lis3_dev.read(handle, reg, &hi);
-	/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
-	return (s16)((hi << 8) | lo);
-}
-
-static s16 lis3lv02d_read_8(acpi_handle handle, int reg)
-{
-	s8 lo;
-	lis3_dev.read(handle, reg, &lo);
-	return lo;
-}
-
 static int lis3lv02d_add(struct acpi_device *device)
 {
 	int ret;
@@ -286,7 +279,7 @@ static int lis3lv02d_add(struct acpi_device *device)
 	if (!device)
 		return -EINVAL;
 
-	lis3_dev.device = device;
+	lis3_dev.bus_priv = device;
 	lis3_dev.init = lis3lv02d_acpi_init;
 	lis3_dev.read = lis3lv02d_acpi_read;
 	lis3_dev.write = lis3lv02d_acpi_write;
@@ -294,23 +287,8 @@ static int lis3lv02d_add(struct acpi_device *device)
 	strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
 	device->driver_data = &lis3_dev;
 
-	lis3lv02d_acpi_read(device->handle, WHO_AM_I, &lis3_dev.whoami);
-	switch (lis3_dev.whoami) {
-	case LIS_DOUBLE_ID:
-		printk(KERN_INFO DRIVER_NAME ": 2-byte sensor found\n");
-		lis3_dev.read_data = lis3lv02d_read_16;
-		lis3_dev.mdps_max_val = 2048;
-		break;
-	case LIS_SINGLE_ID:
-		printk(KERN_INFO DRIVER_NAME ": 1-byte sensor found\n");
-		lis3_dev.read_data = lis3lv02d_read_8;
-		lis3_dev.mdps_max_val = 128;
-		break;
-	default:
-		printk(KERN_ERR DRIVER_NAME
-			": unknown sensor type 0x%X\n", lis3_dev.whoami);
-		return -EINVAL;
-	}
+	/* obtain IRQ number of our device from ACPI */
+	lis3lv02d_enum_resources(device);
 
 	/* If possible use a "standard" axes order */
 	if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
@@ -319,18 +297,17 @@ static int lis3lv02d_add(struct acpi_device *device)
 		lis3_dev.ac = lis3lv02d_axis_normal;
 	}
 
-	INIT_WORK(&hpled_led.work, delayed_set_status_worker);
-	ret = led_classdev_register(NULL, &hpled_led.led_classdev);
+	/* call the core layer do its init */
+	ret = lis3lv02d_init_device(&lis3_dev);
 	if (ret)
 		return ret;
 
-	/* obtain IRQ number of our device from ACPI */
-	lis3lv02d_enum_resources(lis3_dev.device);
-
-	ret = lis3lv02d_init_device(&lis3_dev);
+	INIT_WORK(&hpled_led.work, delayed_set_status_worker);
+	ret = led_classdev_register(NULL, &hpled_led.led_classdev);
 	if (ret) {
+		lis3lv02d_joystick_disable();
+		lis3lv02d_poweroff(&lis3_dev);
 		flush_work(&hpled_led.work);
-		led_classdev_unregister(&hpled_led.led_classdev);
 		return ret;
 	}
 
@@ -343,7 +320,7 @@ static int lis3lv02d_remove(struct acpi_device *device, int type)
 		return -EINVAL;
 
 	lis3lv02d_joystick_disable();
-	lis3lv02d_poweroff(device->handle);
+	lis3lv02d_poweroff(&lis3_dev);
 
 	flush_work(&hpled_led.work);
 	led_classdev_unregister(&hpled_led.led_classdev);
@@ -356,7 +333,7 @@ static int lis3lv02d_remove(struct acpi_device *device, int type)
 static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
 {
 	/* make sure the device is off when we suspend */
-	lis3lv02d_poweroff(device->handle);
+	lis3lv02d_poweroff(&lis3_dev);
 	return 0;
 }
 
@@ -365,9 +342,9 @@ static int lis3lv02d_resume(struct acpi_device *device)
 	/* put back the device in the right state (ACPI might turn it on) */
 	mutex_lock(&lis3_dev.lock);
 	if (lis3_dev.usage > 0)
-		lis3lv02d_poweron(device->handle);
+		lis3lv02d_poweron(&lis3_dev);
 	else
-		lis3lv02d_poweroff(device->handle);
+		lis3lv02d_poweroff(&lis3_dev);
 	mutex_unlock(&lis3_dev.lock);
 	return 0;
 }