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hwmon: lis3: use block read to access data registers

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Add optional blockread function to interface driver. If available
the chip driver uses it for data register access. For 12 bit device
it reads 6 bytes to get 3*16bit data. For 8 bit device it reads out
5 bytes since every second byte is dummy.
This optimizes bus usage and reduces number of operations and
interrupts needed for one data update.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Samu Onkalo 2010-10-22 07:57:31 -04:00 • committed by Guenter Roeck
parent 477bc918c2
commit f10a5407b5
4 changed files with 33 additions and 3 deletions
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include/linux/lis3lv02d.h
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@ -68,6 +68,7 @@ struct lis3lv02d_platform_data {
s8 axis_y;
s8 axis_z;
#define LIS3_USE_REGULATOR_CTRL 0x01
#define LIS3_USE_BLOCK_READ 0x02
u16 driver_features;
int default_rate;
int (*setup_resources)(void);