Remove const array that defines channels. Build channels definition
at probe time, when initializing channels (only for requested ones).
This will ease adding differential channels support.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
---
Changes in v2:
- Improve val variable names in stm32_adc_chan_init_one()
definition as suggested by Jonathan.
---
drivers/iio/adc/stm32-adc.c | 66 ++++++++++-----------------------------------
1 file changed, 14 insertions(+), 52 deletions(-)
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index 4df32cf..417a894 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -153,6 +153,8 @@ enum stm32h7_adc_dmngt {
/* BOOST bit must be set on STM32H7 when ADC clock is above 20MHz */
#define STM32H7_BOOST_CLKRATE 20000000UL
+#define STM32_ADC_CH_MAX 20 /* max number of channels */
+#define STM32_ADC_CH_SZ 5 /* max channel name size */
#define STM32_ADC_MAX_SQ 16 /* SQ1..SQ16 */
#define STM32_ADC_MAX_SMP 7 /* SMPx range is [0..7] */
#define STM32_ADC_TIMEOUT_US 100000
@@ -300,6 +302,7 @@ struct stm32_adc_cfg {
* @pcsel bitmask to preselect channels on some devices
* @smpr_val: sampling time settings (e.g. smpr1 / smpr2)
* @cal: optional calibration data on some devices
+ * @chan_name: channel name array
*/
struct stm32_adc {
struct stm32_adc_common *common;
@@ -321,69 +324,28 @@ struct stm32_adc {
u32 pcsel;
u32 smpr_val[2];
struct stm32_adc_calib cal;
-};
-
-/**
- * struct stm32_adc_chan_spec - specification of stm32 adc channel
- * @type: IIO channel type
- * @channel: channel number (single ended)
- * @name: channel name (single ended)
- */
-struct stm32_adc_chan_spec {
- enum iio_chan_type type;
- int channel;
- const char *name;
+ char chan_name[STM32_ADC_CH_MAX][STM32_ADC_CH_SZ];
};
/**
* struct stm32_adc_info - stm32 ADC, per instance config data
- * @channels: Reference to stm32 channels spec
* @max_channels: Number of channels
* @resolutions: available resolutions
* @num_res: number of available resolutions
*/
struct stm32_adc_info {
- const struct stm32_adc_chan_spec *channels;
int max_channels;
const unsigned int *resolutions;
const unsigned int num_res;
};
-/*
- * Input definitions common for all instances:
- * stm32f4 can have up to 16 channels
- * stm32h7 can have up to 20 channels
- */
-static const struct stm32_adc_chan_spec stm32_adc_channels[] = {
- { IIO_VOLTAGE, 0, "in0" },
- { IIO_VOLTAGE, 1, "in1" },
- { IIO_VOLTAGE, 2, "in2" },
- { IIO_VOLTAGE, 3, "in3" },
- { IIO_VOLTAGE, 4, "in4" },
- { IIO_VOLTAGE, 5, "in5" },
- { IIO_VOLTAGE, 6, "in6" },
- { IIO_VOLTAGE, 7, "in7" },
- { IIO_VOLTAGE, 8, "in8" },
- { IIO_VOLTAGE, 9, "in9" },
- { IIO_VOLTAGE, 10, "in10" },
- { IIO_VOLTAGE, 11, "in11" },
- { IIO_VOLTAGE, 12, "in12" },
- { IIO_VOLTAGE, 13, "in13" },
- { IIO_VOLTAGE, 14, "in14" },
- { IIO_VOLTAGE, 15, "in15" },
- { IIO_VOLTAGE, 16, "in16" },
- { IIO_VOLTAGE, 17, "in17" },
- { IIO_VOLTAGE, 18, "in18" },
- { IIO_VOLTAGE, 19, "in19" },
-};
-
static const unsigned int stm32f4_adc_resolutions[] = {
/* sorted values so the index matches RES[1:0] in STM32F4_ADC_CR1 */
12, 10, 8, 6,
};
+/* stm32f4 can have up to 16 channels */
static const struct stm32_adc_info stm32f4_adc_info = {
- .channels = stm32_adc_channels,
.max_channels = 16,
.resolutions = stm32f4_adc_resolutions,
.num_res = ARRAY_SIZE(stm32f4_adc_resolutions),
@@ -394,9 +356,9 @@ struct stm32_adc_info {
16, 14, 12, 10, 8,
};
+/* stm32h7 can have up to 20 channels */
static const struct stm32_adc_info stm32h7_adc_info = {
- .channels = stm32_adc_channels,
- .max_channels = 20,
+ .max_channels = STM32_ADC_CH_MAX,
.resolutions = stm32h7_adc_resolutions,
.num_res = ARRAY_SIZE(stm32h7_adc_resolutions),
};
@@ -1628,15 +1590,16 @@ static void stm32_adc_smpr_init(struct stm32_adc *adc, int channel, u32 smp_ns)
}
static void stm32_adc_chan_init_one(struct iio_dev *indio_dev,
- struct iio_chan_spec *chan,
- const struct stm32_adc_chan_spec *channel,
+ struct iio_chan_spec *chan, u32 vinp,
int scan_index, u32 smp)
{
struct stm32_adc *adc = iio_priv(indio_dev);
+ char *name = adc->chan_name[vinp];
- chan->type = channel->type;
- chan->channel = channel->channel;
- chan->datasheet_name = channel->name;
+ chan->type = IIO_VOLTAGE;
+ chan->channel = vinp;
+ snprintf(name, STM32_ADC_CH_SZ, "in%d", vinp);
+ chan->datasheet_name = name;
chan->scan_index = scan_index;
chan->indexed = 1;
chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
@@ -1699,8 +1662,7 @@ static int stm32_adc_chan_of_init(struct iio_dev *indio_dev)
scan_index, &smp);
stm32_adc_chan_init_one(indio_dev, &channels[scan_index],
- &adc_info->channels[val],
- scan_index, smp);
+ val, scan_index, smp);
scan_index++;
}
--
1.9.1
--
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