lis3: remove automatic shutdown of the device

After measurement on my laptop, it seems that turning off the device does
not bring any energy saving (within 0.1W precision).  So let's keep the
device always on.  It simplifies the code, and it avoids the problem of
reading a wrong value sometimes just after turning the device on.

Moreover, since commit ef2cfc790bf5f0ff189b01eabc0f4feb5e8524df had been
too zealous, the device was actually never turned off anyway.  This patch
also restores the damages done by this commit concerning the
initialisation/poweroff.

Also do more clean up with the usage of the lis3_dev global variable.

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

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 745ec96806d4..b007d8184212 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -171,14 +171,11 @@ struct lis3lv02d {
 
         struct input_dev        *idev;     /* input device */
         struct task_struct      *kthread;  /* kthread for input */
-        struct mutex            lock;
         struct platform_device  *pdev;     /* platform device */
         atomic_t                count;     /* interrupt count after last read */
         int                     xcalib;    /* calibrated null value for x */
         int                     ycalib;    /* calibrated null value for y */
         int                     zcalib;    /* calibrated null value for z */
-        unsigned char           is_on;     /* whether the device is on or off */
-        unsigned char           usage;     /* usage counter */
         struct axis_conversion  ac;        /* hw -> logical axis */
 
         u32                     irq;       /* IRQ number */
@@ -192,6 +189,6 @@ int lis3lv02d_joystick_enable(void);
 void lis3lv02d_joystick_disable(void);
 void lis3lv02d_poweroff(struct lis3lv02d *lis3);
 void lis3lv02d_poweron(struct lis3lv02d *lis3);
-int lis3lv02d_remove_fs(void);
+int lis3lv02d_remove_fs(struct lis3lv02d *lis3);
 
 extern struct lis3lv02d lis3_dev;