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>

3 files changed, 105 insertions, 100 deletions

diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
index de26b1c3a96c..55d3dc565be6 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;
 }
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index eeae7c9600e4..778eb7795983 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -36,7 +36,6 @@
 #include <linux/freezer.h>
 #include <linux/uaccess.h>
 #include <linux/miscdevice.h>
-#include <acpi/acpi_drivers.h>
 #include <asm/atomic.h>
 #include "lis3lv02d.h"
 
@@ -53,18 +52,27 @@
  * joystick.
  */
 
-struct acpi_lis3lv02d lis3_dev = {
+struct lis3lv02d lis3_dev = {
         .misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
 };
 
 EXPORT_SYMBOL_GPL(lis3_dev);
 
-static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
+static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
+{
+        s8 lo;
+        if (lis3->read(lis3, reg, &lo) < 0)
+                return 0;
+
+        return lo;
+}
+
+static s16 lis3lv02d_read_16(struct lis3lv02d *lis3, int reg)
 {
         u8 lo, hi;
 
-        lis3_dev.read(handle, reg, &lo);
-        lis3_dev.read(handle, reg + 1, &hi);
+        lis3->read(lis3, reg - 1, &lo);
+        lis3->read(lis3, reg, &hi);
         /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
         return (s16)((hi << 8) | lo);
 }
@@ -86,36 +94,36 @@ static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
 
 /**
  * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
- * @handle: the handle to the device
- * @x:      where to store the X axis value
- * @y:      where to store the Y axis value
- * @z:      where to store the Z axis value
+ * @lis3: pointer to the device struct
+ * @x:    where to store the X axis value
+ * @y:    where to store the Y axis value
+ * @z:    where to store the Z axis value
  *
  * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
  */
-static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z)
+static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 {
         int position[3];
 
-        position[0] = lis3_dev.read_data(handle, OUTX);
-        position[1] = lis3_dev.read_data(handle, OUTY);
-        position[2] = lis3_dev.read_data(handle, OUTZ);
+        position[0] = lis3_dev.read_data(lis3, OUTX);
+        position[1] = lis3_dev.read_data(lis3, OUTY);
+        position[2] = lis3_dev.read_data(lis3, OUTZ);
 
         *x = lis3lv02d_get_axis(lis3_dev.ac.x, position);
         *y = lis3lv02d_get_axis(lis3_dev.ac.y, position);
         *z = lis3lv02d_get_axis(lis3_dev.ac.z, position);
 }
 
-void lis3lv02d_poweroff(acpi_handle handle)
+void lis3lv02d_poweroff(struct lis3lv02d *lis3)
 {
         lis3_dev.is_on = 0;
 }
 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
 
-void lis3lv02d_poweron(acpi_handle handle)
+void lis3lv02d_poweron(struct lis3lv02d *lis3)
 {
         lis3_dev.is_on = 1;
-        lis3_dev.init(handle);
+        lis3_dev.init(lis3);
 }
 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
 
@@ -124,13 +132,13 @@ EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
  * device will always be on until a call to lis3lv02d_decrease_use(). Not to be
  * used from interrupt context.
  */
-static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev)
+static void lis3lv02d_increase_use(struct lis3lv02d *dev)
 {
         mutex_lock(&dev->lock);
         dev->usage++;
         if (dev->usage == 1) {
                 if (!dev->is_on)
-                        lis3lv02d_poweron(dev->device->handle);
+                        lis3lv02d_poweron(dev);
         }
         mutex_unlock(&dev->lock);
 }
@@ -139,12 +147,12 @@ static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev)
  * To be called whenever a usage of the device is stopped.
  * It will make sure to turn off the device when there is not usage.
  */
-static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev)
+static void lis3lv02d_decrease_use(struct lis3lv02d *dev)
 {
         mutex_lock(&dev->lock);
         dev->usage--;
         if (dev->usage == 0)
-                lis3lv02d_poweroff(dev->device->handle);
+                lis3lv02d_poweroff(dev);
         mutex_unlock(&dev->lock);
 }
 
@@ -291,7 +299,7 @@ static int lis3lv02d_joystick_kthread(void *data)
         int x, y, z;
 
         while (!kthread_should_stop()) {
-                lis3lv02d_get_xyz(lis3_dev.device->handle, &x, &y, &z);
+                lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
                 input_report_abs(lis3_dev.idev, ABS_X, x - lis3_dev.xcalib);
                 input_report_abs(lis3_dev.idev, ABS_Y, y - lis3_dev.ycalib);
                 input_report_abs(lis3_dev.idev, ABS_Z, z - lis3_dev.zcalib);
@@ -325,7 +333,8 @@ static void lis3lv02d_joystick_close(struct input_dev *input)
 
 static inline void lis3lv02d_calibrate_joystick(void)
 {
-        lis3lv02d_get_xyz(lis3_dev.device->handle, &lis3_dev.xcalib, &lis3_dev.ycalib, &lis3_dev.zcalib);
+        lis3lv02d_get_xyz(&lis3_dev,
+                &lis3_dev.xcalib, &lis3_dev.ycalib, &lis3_dev.zcalib);
 }
 
 int lis3lv02d_joystick_enable(void)
@@ -382,7 +391,7 @@ static ssize_t lis3lv02d_position_show(struct device *dev,
         int x, y, z;
 
         lis3lv02d_increase_use(&lis3_dev);
-        lis3lv02d_get_xyz(lis3_dev.device->handle, &x, &y, &z);
+        lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
         lis3lv02d_decrease_use(&lis3_dev);
         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 }
@@ -412,7 +421,7 @@ static ssize_t lis3lv02d_rate_show(struct device *dev,
         int val;
 
         lis3lv02d_increase_use(&lis3_dev);
-        lis3_dev.read(lis3_dev.device->handle, CTRL_REG1, &ctrl);
+        lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
         lis3lv02d_decrease_use(&lis3_dev);
         val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
         return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
@@ -435,7 +444,7 @@ static struct attribute_group lis3lv02d_attribute_group = {
 };
 
 
-static int lis3lv02d_add_fs(struct acpi_device *device)
+static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 {
         lis3_dev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
         if (IS_ERR(lis3_dev.pdev))
@@ -456,10 +465,29 @@ EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
  * Initialise the accelerometer and the various subsystems.
  * Should be rather independant of the bus system.
  */
-int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
+int lis3lv02d_init_device(struct lis3lv02d *dev)
 {
+        dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
+
+        switch (dev->whoami) {
+        case LIS_DOUBLE_ID:
+                printk(KERN_INFO DRIVER_NAME ": 2-byte sensor found\n");
+                dev->read_data = lis3lv02d_read_16;
+                dev->mdps_max_val = 2048;
+                break;
+        case LIS_SINGLE_ID:
+                printk(KERN_INFO DRIVER_NAME ": 1-byte sensor found\n");
+                dev->read_data = lis3lv02d_read_8;
+                dev->mdps_max_val = 128;
+                break;
+        default:
+                printk(KERN_ERR DRIVER_NAME
+                        ": unknown sensor type 0x%X\n", lis3_dev.whoami);
+                return -EINVAL;
+        }
+
         mutex_init(&dev->lock);
-        lis3lv02d_add_fs(dev->device);
+        lis3lv02d_add_fs(dev);
         lis3lv02d_increase_use(dev);
 
         if (lis3lv02d_joystick_enable())
@@ -467,10 +495,10 @@ int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
 
         printk("lis3_init_device: irq %d\n", dev->irq);
 
-        /* if we did not get an IRQ from ACPI - we have nothing more to do */
+        /* bail if we did not get an IRQ from the bus layer */
         if (!dev->irq) {
                 printk(KERN_ERR DRIVER_NAME
-                        ": No IRQ in ACPI. Disabling /dev/freefall\n");
+                        ": No IRQ. Disabling /dev/freefall\n");
                 goto out;
         }
 
diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 017fb2b754d5..745ec96806d4 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -159,14 +159,14 @@ struct axis_conversion {
         s8      z;
 };
 
-struct acpi_lis3lv02d {
-        struct acpi_device      *device;   /* The ACPI device */
-        acpi_status (*init) (acpi_handle handle);
-        acpi_status (*write) (acpi_handle handle, int reg, u8 val);
-        acpi_status (*read) (acpi_handle handle, int reg, u8 *ret);
+struct lis3lv02d {
+        void                    *bus_priv; /* used by the bus layer only */
+        int (*init) (struct lis3lv02d *lis3);
+        int (*write) (struct lis3lv02d *lis3, int reg, u8 val);
+        int (*read) (struct lis3lv02d *lis3, int reg, u8 *ret);
 
         u8                      whoami;    /* 3Ah: 2-byte registries, 3Bh: 1-byte registries */
-        s16 (*read_data) (acpi_handle handle, int reg);
+        s16 (*read_data) (struct lis3lv02d *lis3, int reg);
         int                     mdps_max_val;
 
         struct input_dev        *idev;     /* input device */
@@ -187,11 +187,11 @@ struct acpi_lis3lv02d {
         unsigned long           misc_opened; /* bit0: whether the device is open */
 };
 
-int lis3lv02d_init_device(struct acpi_lis3lv02d *dev);
+int lis3lv02d_init_device(struct lis3lv02d *lis3);
 int lis3lv02d_joystick_enable(void);
 void lis3lv02d_joystick_disable(void);
-void lis3lv02d_poweroff(acpi_handle handle);
-void lis3lv02d_poweron(acpi_handle handle);
+void lis3lv02d_poweroff(struct lis3lv02d *lis3);
+void lis3lv02d_poweron(struct lis3lv02d *lis3);
 int lis3lv02d_remove_fs(void);
 
-extern struct acpi_lis3lv02d lis3_dev;
+extern struct lis3lv02d lis3_dev;