From 32f228cb2ac7ce46cbc3dc0188ea94157039c69a Mon Sep 17 00:00:00 2001 From: Jeremy Fertic <jeremyfertic@gmail.com> Date: Tue, 11 Dec 2018 17:55:02 -0700 Subject: [PATCH] staging: iio: adt7316: change interpretation of write to dac update mode Based on the output of adt7316_show_all_DAC_update_modes() and adt7316_show_DAC_update_mode(), adt7316_store_DAC_update_mode() should expect the user to enter an integer input from 0 to 3. The user input is currently expected to account for the actual bit positions in the register. For example, choosing option 3 would require a write of 0x30 (actually 48 since it expects base 10). To address this inconsistency, create a shift macro to be used in the valid input check as well as the calculation for the register write. Signed-off-by: Jeremy Fertic <jeremyfertic@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- drivers/staging/iio/addac/adt7316.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c index 0ee925edad042..773ce92482dbc 100644 --- a/drivers/staging/iio/addac/adt7316.c +++ b/drivers/staging/iio/addac/adt7316.c @@ -127,6 +127,7 @@ */ #define ADT7316_DA_2VREF_CH_MASK 0xF #define ADT7316_DA_EN_MODE_MASK 0x30 +#define ADT7316_DA_EN_MODE_SHIFT 4 #define ADT7316_DA_EN_MODE_SINGLE 0x00 #define ADT7316_DA_EN_MODE_AB_CD 0x10 #define ADT7316_DA_EN_MODE_ABCD 0x20 @@ -884,11 +885,11 @@ static ssize_t adt7316_store_DAC_update_mode(struct device *dev, return -EPERM; ret = kstrtou8(buf, 10, &data); - if (ret || data > ADT7316_DA_EN_MODE_MASK) + if (ret || data > (ADT7316_DA_EN_MODE_MASK >> ADT7316_DA_EN_MODE_SHIFT)) return -EINVAL; dac_config = chip->dac_config & (~ADT7316_DA_EN_MODE_MASK); - dac_config |= data; + dac_config |= data << ADT7316_DA_EN_MODE_SHIFT; ret = chip->bus.write(chip->bus.client, ADT7316_DAC_CONFIG, dac_config); if (ret) -- GitLab