hwmon: lis3: use block read to access data registers

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>

4 files changed, 33 insertions, 3 deletions

diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index a4929b72506e..0780de0550df 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -154,9 +154,24 @@ static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 	int position[3];
 	int i;
 
-	position[0] = lis3->read_data(lis3, OUTX);
-	position[1] = lis3->read_data(lis3, OUTY);
-	position[2] = lis3->read_data(lis3, OUTZ);
+	if (lis3->blkread) {
+		if (lis3_dev.whoami == WAI_12B) {
+			u16 data[3];
+			lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
+			for (i = 0; i < 3; i++)
+				position[i] = (s16)le16_to_cpu(data[i]);
+		} else {
+			u8 data[5];
+			/* Data: x, dummy, y, dummy, z */
+			lis3->blkread(lis3, OUTX, 5, data);
+			for (i = 0; i < 3; i++)
+				position[i] = (s8)data[i * 2];
+		}
+	} else {
+		position[0] = lis3->read_data(lis3, OUTX);
+		position[1] = lis3->read_data(lis3, OUTY);
+		position[2] = lis3->read_data(lis3, OUTZ);
+	}
 
 	for (i = 0; i < 3; i++)
 		position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 77ebb15ea0b3..fdbe899a7f14 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -244,6 +244,7 @@ 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 (*blkread) (struct lis3lv02d *lis3, int reg, int len, u8 *ret);
 	int (*reg_ctrl) (struct lis3lv02d *lis3, bool state);
 
 	int                     *odrs;     /* Supported output data rates */
diff --git a/drivers/hwmon/lis3lv02d_i2c.c b/drivers/hwmon/lis3lv02d_i2c.c
index c1e7420cf77d..0074809917a2 100644
--- a/drivers/hwmon/lis3lv02d_i2c.c
+++ b/drivers/hwmon/lis3lv02d_i2c.c
@@ -66,6 +66,14 @@ static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
 	return 0;
 }
 
+static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
+				u8 *v)
+{
+	struct i2c_client *c = lis3->bus_priv;
+	reg |= (1 << 7); /* 7th bit enables address auto incrementation */
+	return i2c_smbus_read_i2c_block_data(c, reg, len, v);
+}
+
 static int lis3_i2c_init(struct lis3lv02d *lis3)
 {
 	u8 reg;
@@ -102,6 +110,11 @@ static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
 		if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL)
 			lis3_dev.reg_ctrl = lis3_reg_ctrl;
 
+		if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
+			(i2c_check_functionality(client->adapter,
+						I2C_FUNC_SMBUS_I2C_BLOCK)))
+			lis3_dev.blkread  = lis3_i2c_blockread;
+
 		if (pdata->axis_x)
 			lis3lv02d_axis_map.x = pdata->axis_x;
 
diff --git a/include/linux/lis3lv02d.h b/include/linux/lis3lv02d.h
index 18d578f08120..c949612ac841 100644
--- a/include/linux/lis3lv02d.h
+++ b/include/linux/lis3lv02d.h
@@ -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);