iio: amplifiers: hmc425a: Add Support HMC540S 4-bit Attenuator

This adds support for the Analog Devices HMC540s 1 dB LSB
Silicon MMIC 4-Bit Digital Positive Control Attenuator, 0.1 - 8 GHz

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Ana-Maria Cusco <ana-maria.cusco@analog.com>
Link: https://lore.kernel.org/r/20230816110906.144540-1-ana-maria.cusco@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/amplifiers/hmc425a.c b/drivers/iio/amplifiers/hmc425a.c
index 108f0f1685ef1661f9ac6edbadb715d20f8bbc8e..e87d35d50a95cdfbe4a2a78d2621fc3eaea04d9f 100644 (file)
--- a/drivers/iio/amplifiers/hmc425a.c
+++ b/drivers/iio/amplifiers/hmc425a.c
@@ -21,6 +21,7 @@
 
 enum hmc425a_type {
        ID_HMC425A,
+       ID_HMC540S,
 };
 
 struct hmc425a_chip_info {
@@ -70,6 +71,9 @@ static int hmc425a_read_raw(struct iio_dev *indio_dev,
                case ID_HMC425A:
                        gain = ~code * -500;
                        break;
+               case ID_HMC540S:
+                       gain = ~code * -1000;
+                       break;
                }
 
                *val = gain / 1000;
@@ -106,6 +110,9 @@ static int hmc425a_write_raw(struct iio_dev *indio_dev,
        case ID_HMC425A:
                code = ~((abs(gain) / 500) & 0x3F);
                break;
+       case ID_HMC540S:
+               code = ~((abs(gain) / 1000) & 0xF);
+               break;
        }
 
        mutex_lock(&st->lock);
@@ -157,6 +164,7 @@ static const struct iio_chan_spec hmc425a_channels[] = {
 /* Match table for of_platform binding */
 static const struct of_device_id hmc425a_of_match[] = {
        { .compatible = "adi,hmc425a", .data = (void *)ID_HMC425A },
+       { .compatible = "adi,hmc540s", .data = (void *)ID_HMC540S },
        {},
 };
 MODULE_DEVICE_TABLE(of, hmc425a_of_match);
@@ -171,6 +179,15 @@ static struct hmc425a_chip_info hmc425a_chip_info_tbl[] = {
                .gain_max = 0,
                .default_gain = -0x40, /* set default gain -31.5db*/
        },
+       [ID_HMC540S] = {
+               .name = "hmc540s",
+               .channels = hmc425a_channels,
+               .num_channels = ARRAY_SIZE(hmc425a_channels),
+               .num_gpios = 4,
+               .gain_min = -15000,
+               .gain_max = 0,
+               .default_gain = -0x10, /* set default gain -15.0db*/
+       },
 };
 
 static int hmc425a_probe(struct platform_device *pdev)