iio/adc: (max1363) Add support for external reference voltage
Implement external reference voltage as regulator named "vref". Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -163,6 +163,8 @@ struct max1363_chip_info {
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* @mask_low: bitmask for enabled low thresholds
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* @mask_low: bitmask for enabled low thresholds
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* @thresh_high: high threshold values
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* @thresh_high: high threshold values
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* @thresh_low: low threshold values
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* @thresh_low: low threshold values
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* @vref: Reference voltage regulator
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* @vref_uv: Actual (external or internal) reference voltage
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*/
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*/
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struct max1363_state {
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struct max1363_state {
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struct i2c_client *client;
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struct i2c_client *client;
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@ -182,6 +184,8 @@ struct max1363_state {
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/* 4x unipolar first then the fours bipolar ones */
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/* 4x unipolar first then the fours bipolar ones */
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s16 thresh_high[8];
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s16 thresh_high[8];
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s16 thresh_low[8];
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s16 thresh_low[8];
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struct regulator *vref;
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u32 vref_uv;
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};
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};
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#define MAX1363_MODE_SINGLE(_num, _mask) { \
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#define MAX1363_MODE_SINGLE(_num, _mask) { \
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@ -393,6 +397,8 @@ static int max1363_read_raw(struct iio_dev *indio_dev,
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{
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{
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struct max1363_state *st = iio_priv(indio_dev);
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struct max1363_state *st = iio_priv(indio_dev);
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int ret;
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int ret;
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unsigned long scale_uv;
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switch (m) {
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switch (m) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_RAW:
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ret = max1363_read_single_chan(indio_dev, chan, val, m);
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ret = max1363_read_single_chan(indio_dev, chan, val, m);
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@ -400,16 +406,10 @@ static int max1363_read_raw(struct iio_dev *indio_dev,
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return ret;
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return ret;
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return IIO_VAL_INT;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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case IIO_CHAN_INFO_SCALE:
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if ((1 << (st->chip_info->bits + 1)) >
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scale_uv = st->vref_uv >> st->chip_info->bits;
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st->chip_info->int_vref_mv) {
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*val = scale_uv / 1000;
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*val = 0;
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*val2 = (scale_uv % 1000) * 1000;
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*val2 = 500000;
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return IIO_VAL_INT_PLUS_MICRO;
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return IIO_VAL_INT_PLUS_MICRO;
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} else {
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*val = (st->chip_info->int_vref_mv)
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>> st->chip_info->bits;
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return IIO_VAL_INT;
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}
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default:
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default:
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return -EINVAL;
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return -EINVAL;
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}
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}
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@ -1390,12 +1390,16 @@ static const struct max1363_chip_info max1363_chip_info_tbl[] = {
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static int max1363_initial_setup(struct max1363_state *st)
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static int max1363_initial_setup(struct max1363_state *st)
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{
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{
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st->setupbyte = MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD
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st->setupbyte = MAX1363_SETUP_INT_CLOCK
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| MAX1363_SETUP_POWER_UP_INT_REF
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| MAX1363_SETUP_INT_CLOCK
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| MAX1363_SETUP_UNIPOLAR
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| MAX1363_SETUP_UNIPOLAR
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| MAX1363_SETUP_NORESET;
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| MAX1363_SETUP_NORESET;
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if (st->vref)
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st->setupbyte |= MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF;
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else
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st->setupbyte |= MAX1363_SETUP_POWER_UP_INT_REF
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| MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT;
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/* Set scan mode writes the config anyway so wait until then */
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/* Set scan mode writes the config anyway so wait until then */
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st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte);
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st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte);
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st->current_mode = &max1363_mode_table[st->chip_info->default_mode];
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st->current_mode = &max1363_mode_table[st->chip_info->default_mode];
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@ -1491,6 +1495,7 @@ static int max1363_probe(struct i2c_client *client,
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int ret;
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int ret;
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struct max1363_state *st;
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struct max1363_state *st;
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struct iio_dev *indio_dev;
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struct iio_dev *indio_dev;
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struct regulator *vref;
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indio_dev = iio_device_alloc(sizeof(struct max1363_state));
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indio_dev = iio_device_alloc(sizeof(struct max1363_state));
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if (indio_dev == NULL) {
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if (indio_dev == NULL) {
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@ -1521,6 +1526,23 @@ static int max1363_probe(struct i2c_client *client,
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st->chip_info = &max1363_chip_info_tbl[id->driver_data];
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st->chip_info = &max1363_chip_info_tbl[id->driver_data];
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st->client = client;
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st->client = client;
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st->vref_uv = st->chip_info->int_vref_mv * 1000;
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vref = devm_regulator_get(&client->dev, "vref");
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if (!IS_ERR(vref)) {
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int vref_uv;
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ret = regulator_enable(vref);
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if (ret)
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goto error_disable_reg;
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st->vref = vref;
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vref_uv = regulator_get_voltage(vref);
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if (vref_uv <= 0) {
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ret = -EINVAL;
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goto error_disable_reg;
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}
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st->vref_uv = vref_uv;
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}
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ret = max1363_alloc_scan_masks(indio_dev);
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ret = max1363_alloc_scan_masks(indio_dev);
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if (ret)
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if (ret)
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goto error_disable_reg;
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goto error_disable_reg;
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@ -1562,6 +1584,8 @@ static int max1363_probe(struct i2c_client *client,
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error_uninit_buffer:
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error_uninit_buffer:
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iio_triggered_buffer_cleanup(indio_dev);
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iio_triggered_buffer_cleanup(indio_dev);
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error_disable_reg:
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error_disable_reg:
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if (st->vref)
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regulator_disable(st->vref);
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regulator_disable(st->reg);
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regulator_disable(st->reg);
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error_unregister_map:
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error_unregister_map:
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iio_map_array_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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@ -1578,6 +1602,8 @@ static int max1363_remove(struct i2c_client *client)
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iio_device_unregister(indio_dev);
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iio_device_unregister(indio_dev);
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iio_triggered_buffer_cleanup(indio_dev);
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iio_triggered_buffer_cleanup(indio_dev);
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if (st->vref)
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regulator_disable(st->vref);
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regulator_disable(st->reg);
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regulator_disable(st->reg);
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iio_map_array_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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iio_device_free(indio_dev);
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iio_device_free(indio_dev);
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