hwmon: lis3: regulator control

Based on pm_runtime control, turn lis3 regulators on and off.
Perform context save and restore on transitions.

Feature is optional and must be enabled in platform data.

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>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 633cf1debc52..c5c063de2f48 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -20,6 +20,7 @@
  */
 #include <linux/platform_device.h>
 #include <linux/input-polldev.h>
+#include <linux/regulator/consumer.h>
 
 /*
  * This driver tries to support the "digital" accelerometer chips from
@@ -223,11 +224,17 @@ enum lis3lv02d_click_src_8b {
         CLICK_IA        = 0x40,
 };
 
+enum lis3lv02d_reg_state {
+        LIS3_REG_OFF    = 0x00,
+        LIS3_REG_ON     = 0x01,
+};
+
 union axis_conversion {
         struct {
                 int x, y, z;
         };
         int as_array[3];
+
 };
 
 struct lis3lv02d {
@@ -236,8 +243,13 @@ struct lis3lv02d {
         int (*init) (struct lis3lv02d *lis3);
         int (*write) (struct lis3lv02d *lis3, int reg, u8 val);
         int (*read) (struct lis3lv02d *lis3, int reg, u8 *ret);
+        int (*reg_ctrl) (struct lis3lv02d *lis3, bool state);
 
         int                     *odrs;     /* Supported output data rates */
+        u8                      *regs;     /* Regs to store / restore */
+        int                     regs_size;
+        u8                      *reg_cache;
+        bool                    regs_stored;
         u8                      odr_mask;  /* ODR bit mask */
         u8                      whoami;    /* indicates measurement precision */
         s16 (*read_data) (struct lis3lv02d *lis3, int reg);
@@ -250,6 +262,7 @@ struct lis3lv02d {
 
         struct input_polled_dev *idev;     /* input device */
         struct platform_device  *pdev;     /* platform device */
+        struct regulator_bulk_data regulators[2];
         atomic_t                count;     /* interrupt count after last read */
         union axis_conversion   ac;        /* hw -> logical axis */
         int                     mapped_btns[3];