summaryrefslogtreecommitdiffstats
path: root/drivers/iio/adc
diff options
context:
space:
mode:
authorLars-Peter Clausen <lars@metafoo.de>2012-11-21 16:27:00 +0000
committerJonathan Cameron <jic23@kernel.org>2012-11-30 12:57:09 +0000
commit2edb769d246e6b549ba1c5e9b283bfd058584cbb (patch)
treeaef2271858fdbbec77bf46a71897f4bb22db61b4 /drivers/iio/adc
parentf87f1a2375a51ef8c5048bfce42587dbea1ca627 (diff)
iio:ad7793: Add support for the ad7798 and ad7799
The ad7798 and ad7799 are similar to the ad7792 and ad7793 but are missing some features like the temperature sensor, being able to use an external clocksource and a few other things. This patch adds a new 'flags' fields to the chip_info struct which allows to specify which features a certain chip variant supports. The setup code will then ignore any platform data fields which are related to non supported features. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/adc')
-rw-r--r--drivers/iio/adc/ad7793.c116
1 files changed, 102 insertions, 14 deletions
diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index a109e686b9f..91a5f7aa1ef 100644
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -106,6 +106,8 @@
#define AD7793_ID 0xB
#define AD7794_ID 0xF
#define AD7795_ID 0xF
+#define AD7798_ID 0x8
+#define AD7799_ID 0x9
#define AD7793_ID_MASK 0xF
/* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */
@@ -130,10 +132,16 @@
* The DOUT/RDY output must also be wired to an interrupt capable GPIO.
*/
+#define AD7793_FLAG_HAS_CLKSEL BIT(0)
+#define AD7793_FLAG_HAS_REFSEL BIT(1)
+#define AD7793_FLAG_HAS_VBIAS BIT(2)
+#define AD7793_HAS_EXITATION_CURRENT BIT(3)
+
struct ad7793_chip_info {
unsigned int id;
const struct iio_chan_spec *channels;
unsigned int num_channels;
+ unsigned int flags;
};
struct ad7793_state {
@@ -154,6 +162,8 @@ enum ad7793_supported_device_ids {
ID_AD7793,
ID_AD7794,
ID_AD7795,
+ ID_AD7798,
+ ID_AD7799,
};
static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd)
@@ -205,6 +215,34 @@ static int ad7793_calibrate_all(struct ad7793_state *st)
ARRAY_SIZE(ad7793_calib_arr));
}
+static int ad7793_check_platform_data(struct ad7793_state *st,
+ const struct ad7793_platform_data *pdata)
+{
+ if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 ||
+ pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) &&
+ ((pdata->exitation_current != AD7793_IX_10uA) &&
+ (pdata->exitation_current != AD7793_IX_210uA)))
+ return -EINVAL;
+
+ if (!(st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) &&
+ pdata->clock_src != AD7793_CLK_SRC_INT)
+ return -EINVAL;
+
+ if (!(st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) &&
+ pdata->refsel != AD7793_REFSEL_REFIN1)
+ return -EINVAL;
+
+ if (!(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) &&
+ pdata->bias_voltage != AD7793_BIAS_VOLTAGE_DISABLED)
+ return -EINVAL;
+
+ if (!(st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) &&
+ pdata->exitation_current != AD7793_IX_DISABLED)
+ return -EINVAL;
+
+ return 0;
+}
+
static int ad7793_setup(struct iio_dev *indio_dev,
const struct ad7793_platform_data *pdata,
unsigned int vref_mv)
@@ -214,11 +252,9 @@ static int ad7793_setup(struct iio_dev *indio_dev,
unsigned long long scale_uv;
u32 id;
- if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 ||
- pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) &&
- ((pdata->exitation_current != AD7793_IX_10uA) &&
- (pdata->exitation_current != AD7793_IX_210uA)))
- return -EINVAL;
+ ret = ad7793_check_platform_data(st, pdata);
+ if (ret)
+ return ret;
/* reset the serial interface */
ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
@@ -239,12 +275,18 @@ static int ad7793_setup(struct iio_dev *indio_dev,
}
st->mode = AD7793_MODE_RATE(1);
- st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src);
- st->conf = AD7793_CONF_REFSEL(pdata->refsel);
- st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage);
+ st->conf = 0;
+
+ if (st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL)
+ st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src);
+ if (st->chip_info->flags & AD7793_FLAG_HAS_REFSEL)
+ st->conf |= AD7793_CONF_REFSEL(pdata->refsel);
+ if (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS)
+ st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage);
if (pdata->buffered)
st->conf |= AD7793_CONF_BUF;
- if (pdata->boost_enable)
+ if (pdata->boost_enable &&
+ (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS))
st->conf |= AD7793_CONF_BOOST;
if (pdata->burnout_current)
st->conf |= AD7793_CONF_BO_EN;
@@ -259,11 +301,13 @@ static int ad7793_setup(struct iio_dev *indio_dev,
if (ret)
goto out;
- ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1,
- pdata->exitation_current |
- (pdata->current_source_direction << 2));
- if (ret)
- goto out;
+ if (st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) {
+ ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1,
+ pdata->exitation_current |
+ (pdata->current_source_direction << 2));
+ if (ret)
+ goto out;
+ }
ret = ad7793_calibrate_all(st);
if (ret)
@@ -525,37 +569,79 @@ const struct iio_chan_spec _name##_channels[] = { \
IIO_CHAN_SOFT_TIMESTAMP(9), \
}
+#define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \
+const struct iio_chan_spec _name##_channels[] = { \
+ AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
+ AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
+ AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
+ AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
+ AD_SD_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
+ IIO_CHAN_SOFT_TIMESTAMP(5), \
+}
+
static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4);
static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0);
static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0);
static DECLARE_AD7795_CHANNELS(ad7794, 16, 32);
static DECLARE_AD7795_CHANNELS(ad7795, 24, 32);
+static DECLARE_AD7799_CHANNELS(ad7798, 16, 16);
+static DECLARE_AD7799_CHANNELS(ad7799, 24, 32);
static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
[ID_AD7785] = {
.id = AD7785_ID,
.channels = ad7785_channels,
.num_channels = ARRAY_SIZE(ad7785_channels),
+ .flags = AD7793_FLAG_HAS_CLKSEL |
+ AD7793_FLAG_HAS_REFSEL |
+ AD7793_FLAG_HAS_VBIAS |
+ AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7792] = {
.id = AD7792_ID,
.channels = ad7792_channels,
.num_channels = ARRAY_SIZE(ad7792_channels),
+ .flags = AD7793_FLAG_HAS_CLKSEL |
+ AD7793_FLAG_HAS_REFSEL |
+ AD7793_FLAG_HAS_VBIAS |
+ AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7793] = {
.id = AD7793_ID,
.channels = ad7793_channels,
.num_channels = ARRAY_SIZE(ad7793_channels),
+ .flags = AD7793_FLAG_HAS_CLKSEL |
+ AD7793_FLAG_HAS_REFSEL |
+ AD7793_FLAG_HAS_VBIAS |
+ AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7794] = {
.id = AD7794_ID,
.channels = ad7794_channels,
.num_channels = ARRAY_SIZE(ad7794_channels),
+ .flags = AD7793_FLAG_HAS_CLKSEL |
+ AD7793_FLAG_HAS_REFSEL |
+ AD7793_FLAG_HAS_VBIAS |
+ AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7795] = {
.id = AD7795_ID,
.channels = ad7795_channels,
.num_channels = ARRAY_SIZE(ad7795_channels),
+ .flags = AD7793_FLAG_HAS_CLKSEL |
+ AD7793_FLAG_HAS_REFSEL |
+ AD7793_FLAG_HAS_VBIAS |
+ AD7793_HAS_EXITATION_CURRENT,
+ },
+ [ID_AD7798] = {
+ .id = AD7798_ID,
+ .channels = ad7798_channels,
+ .num_channels = ARRAY_SIZE(ad7798_channels),
+ },
+ [ID_AD7799] = {
+ .id = AD7799_ID,
+ .channels = ad7799_channels,
+ .num_channels = ARRAY_SIZE(ad7799_channels),
},
};
@@ -671,6 +757,8 @@ static const struct spi_device_id ad7793_id[] = {
{"ad7793", ID_AD7793},
{"ad7794", ID_AD7794},
{"ad7795", ID_AD7795},
+ {"ad7798", ID_AD7798},
+ {"ad7799", ID_AD7799},
{}
};
MODULE_DEVICE_TABLE(spi, ad7793_id);