hwmon: (lis3) add axes module parameter for custom axis-mapping

The axis-mapping of lis3dev device on many (rather most) HP machines
doesn't follow the standard.  When each new model appears, users need to
adjust again.  Testing this requires the rebuild of kernel, thus it's not
trivial for end-users.

This patch adds a module parameter "axes" to allow a custom axis-mapping
without patching and recompiling the kernel driver.  User can pass the
parameter such as axes=3,2,1.  Also it can be changed via sysfs.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Eric Piel <eric.piel@tremplin-utc.net>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 62c6652eb9d5..eb5db584eb0e 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -223,10 +223,11 @@ enum lis3lv02d_click_src_8b {
         CLICK_IA        = 0x40,
 };
 
-struct axis_conversion {
-        s8      x;
-        s8      y;
-        s8      z;
+union axis_conversion {
+        struct {
+                int x, y, z;
+        };
+        int as_array[3];
 };
 
 struct lis3lv02d {
@@ -249,7 +250,7 @@ struct lis3lv02d {
         struct input_polled_dev *idev;     /* input device */
         struct platform_device  *pdev;     /* platform device */
         atomic_t                count;     /* interrupt count after last read */
-        struct axis_conversion  ac;        /* hw -> logical axis */
+        union axis_conversion   ac;        /* hw -> logical axis */
         int                     mapped_btns[3];
 
         u32                     irq;       /* IRQ number */