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Subject[PATCH v2 4/8] iio: light: cm32181: Change reg_init to use a bitmap of which registers to init
Date
This is a preparation patch for reading some ACPI tables which give
init values for multiple registers.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Use unsigned long for init_regs_bitmap
- Use for_each_set_bit()
---
drivers/iio/light/cm32181.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 4c26a4a8a070..194aa5a0ad08 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -26,7 +26,7 @@
#define CM32181_REG_ADDR_ID 0x07

/* Number of Configurable Registers */
-#define CM32181_CONF_REG_NUM 0x01
+#define CM32181_CONF_REG_NUM 4

/* CMD register */
#define CM32181_CMD_ALS_DISABLE BIT(0)
@@ -53,10 +53,6 @@

#define SMBUS_ALERT_RESPONSE_ADDRESS 0x0c

-static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
- CM32181_REG_ADDR_CMD,
-};
-
/* CM3218 Family */
static const int cm3218_als_it_bits[] = { 0, 1, 2, 3 };
static const int cm3218_als_it_values[] = { 100000, 200000, 400000, 800000 };
@@ -71,6 +67,7 @@ struct cm32181_chip {
struct i2c_client *client;
struct mutex lock;
u16 conf_regs[CM32181_CONF_REG_NUM];
+ unsigned long init_regs_bitmap;
int calibscale;
int num_als_it;
const int *als_it_bits;
@@ -117,12 +114,13 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
/* Default Values */
cm32181->conf_regs[CM32181_REG_ADDR_CMD] =
CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
+ cm32181->init_regs_bitmap = BIT(CM32181_REG_ADDR_CMD);
cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;

/* Initialize registers*/
- for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
- ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
- cm32181->conf_regs[i]);
+ for_each_set_bit(i, &cm32181->init_regs_bitmap, CM32181_CONF_REG_NUM) {
+ ret = i2c_smbus_write_word_data(client, i,
+ cm32181->conf_regs[i]);
if (ret < 0)
return ret;
}
--
2.26.0
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