iio: accel: kxsd9: Deploy proper register bit defines

There are some hardcoded register values etc in the code, define
proper bitfield definitions, and use them when getting and setting
the scale. Optimize a read/modify/write to use regmap_update_bits()
at the same time.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/accel/kxsd9.c b/drivers/iio/accel/kxsd9.c
index d84413ae14b1ac245db529b6a3cd13d7e50fe158..8c6a4559256e4b88325cd3aa4322169503b9d0a2 100644 (file)
--- a/drivers/iio/accel/kxsd9.c
+++ b/drivers/iio/accel/kxsd9.c
@@ -20,6 +20,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
+#include <linux/bitops.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/buffer.h>
@@ -35,9 +36,29 @@
 #define KXSD9_REG_RESET                0x0a
 #define KXSD9_REG_CTRL_C       0x0c
 
-#define KXSD9_FS_MASK          0x03
+#define KXSD9_CTRL_C_FS_MASK   0x03
+#define KXSD9_CTRL_C_FS_8G     0x00
+#define KXSD9_CTRL_C_FS_6G     0x01
+#define KXSD9_CTRL_C_FS_4G     0x02
+#define KXSD9_CTRL_C_FS_2G     0x03
+#define KXSD9_CTRL_C_MOT_LAT   BIT(3)
+#define KXSD9_CTRL_C_MOT_LEV   BIT(4)
+#define KXSD9_CTRL_C_LP_MASK   0xe0
+#define KXSD9_CTRL_C_LP_NONE   0x00
+#define KXSD9_CTRL_C_LP_2000HZC        BIT(5)
+#define KXSD9_CTRL_C_LP_2000HZB        BIT(6)
+#define KXSD9_CTRL_C_LP_2000HZA        (BIT(5)|BIT(6))
+#define KXSD9_CTRL_C_LP_1000HZ BIT(7)
+#define KXSD9_CTRL_C_LP_500HZ  (BIT(7)|BIT(5))
+#define KXSD9_CTRL_C_LP_100HZ  (BIT(7)|BIT(6))
+#define KXSD9_CTRL_C_LP_50HZ   (BIT(7)|BIT(6)|BIT(5))
 
 #define KXSD9_REG_CTRL_B       0x0d
+
+#define KXSD9_CTRL_B_CLK_HLD   BIT(7)
+#define KXSD9_CTRL_B_ENABLE    BIT(6)
+#define KXSD9_CTRL_B_ST                BIT(5) /* Self-test */
+
 #define KXSD9_REG_CTRL_A       0x0e
 
 /**
@@ -65,7 +86,6 @@ static int kxsd9_write_scale(struct iio_dev *indio_dev, int micro)
        int ret, i;
        struct kxsd9_state *st = iio_priv(indio_dev);
        bool foundit = false;
-       unsigned int val;
 
        for (i = 0; i < 4; i++)
                if (micro == kxsd9_micro_scales[i]) {
@@ -75,14 +95,12 @@ static int kxsd9_write_scale(struct iio_dev *indio_dev, int micro)
        if (!foundit)
                return -EINVAL;
 
-       ret = regmap_read(st->map,
-                         KXSD9_REG_CTRL_C,
-                         &val);
+       ret = regmap_update_bits(st->map,
+                                KXSD9_REG_CTRL_C,
+                                KXSD9_CTRL_C_FS_MASK,
+                                i);
        if (ret < 0)
                goto error_ret;
-       ret = regmap_write(st->map,
-                          KXSD9_REG_CTRL_C,
-                          (val & ~KXSD9_FS_MASK) | i);
 error_ret:
        return ret;
 }
@@ -150,7 +168,7 @@ static int kxsd9_read_raw(struct iio_dev *indio_dev,
                if (ret < 0)
                        goto error_ret;
                *val = 0;
-               *val2 = kxsd9_micro_scales[regval & KXSD9_FS_MASK];
+               *val2 = kxsd9_micro_scales[regval & KXSD9_CTRL_C_FS_MASK];
                ret = IIO_VAL_INT_PLUS_MICRO;
                break;
        }