ti-adc081c: Add support for adc101c and adc121c

These chips have an almost identical interface but support a different
number of value bits. Datasheet links for comparison:

 * http://www.ti.com/lit/ds/symlink/adc081c021.pdf
 * http://www.ti.com/lit/ds/symlink/adc101c021.pdf
 * http://www.ti.com/lit/ds/symlink/adc121c021.pdf

Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 5937030..25378c5 100644 (file)
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -385,11 +385,11 @@ config ROCKCHIP_SARADC
          module will be called rockchip_saradc.
 
 config TI_ADC081C
-       tristate "Texas Instruments ADC081C021/027"
+       tristate "Texas Instruments ADC081C/ADC101C/ADC121C family"
        depends on I2C
        help
-         If you say yes here you get support for Texas Instruments ADC081C021
-         and ADC081C027 ADC chips.
+         If you say yes here you get support for Texas Instruments ADC081C,
+         ADC101C and ADC121C ADC chips.
 
          This driver can also be built as a module. If so, the module will be
          called ti-adc081c.

diff --git a/drivers/iio/adc/ti-adc081c.c b/drivers/iio/adc/ti-adc081c.c
index ecbc121..b977340 100644 (file)
--- a/drivers/iio/adc/ti-adc081c.c
+++ b/drivers/iio/adc/ti-adc081c.c
@@ -1,9 +1,21 @@
 /*
+ * TI ADC081C/ADC101C/ADC121C 8/10/12-bit ADC driver
+ *
  * Copyright (C) 2012 Avionic Design GmbH
+ * Copyright (C) 2016 Intel
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
+ *
+ * Datasheets:
+ *     http://www.ti.com/lit/ds/symlink/adc081c021.pdf
+ *     http://www.ti.com/lit/ds/symlink/adc101c021.pdf
+ *     http://www.ti.com/lit/ds/symlink/adc121c021.pdf
+ *
+ * The devices have a very similar interface and differ mostly in the number of
+ * bits handled. For the 8-bit and 10-bit models the least-significant 4 or 2
+ * bits of value registers are reserved.
  */
 
 #include <linux/err.h>
@@ -17,6 +29,9 @@
 struct adc081c {
        struct i2c_client *i2c;
        struct regulator *ref;
+
+       /* 8, 10 or 12 */
+       int bits;
 };
 
 #define REG_CONV_RES 0x00
@@ -34,7 +49,7 @@ static int adc081c_read_raw(struct iio_dev *iio,
                if (err < 0)
                        return err;
 
-               *value = (err >> 4) & 0xff;
+               *value = (err & 0xFFF) >> (12 - adc->bits);
                return IIO_VAL_INT;
 
        case IIO_CHAN_INFO_SCALE:
@@ -43,7 +58,7 @@ static int adc081c_read_raw(struct iio_dev *iio,
                        return err;
 
                *value = err / 1000;
-               *shift = 8;
+               *shift = adc->bits;
 
                return IIO_VAL_FRACTIONAL_LOG2;
 
@@ -60,6 +75,28 @@ static const struct iio_chan_spec adc081c_channel = {
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 };
 
+struct adcxx1c_model {
+       int bits;
+};
+
+#define ADCxx1C_MODEL(_bits)                                           \
+       {                                                               \
+               .bits = (_bits),                                        \
+       }
+
+/* Model ids are indexes in _models array */
+enum adcxx1c_model_id {
+       ADC081C = 0,
+       ADC101C = 1,
+       ADC121C = 2,
+};
+
+static struct adcxx1c_model adcxx1c_models[] = {
+       ADCxx1C_MODEL( 8),
+       ADCxx1C_MODEL(10),
+       ADCxx1C_MODEL(12),
+};
+
 static const struct iio_info adc081c_info = {
        .read_raw = adc081c_read_raw,
        .driver_module = THIS_MODULE,
@@ -70,6 +107,7 @@ static int adc081c_probe(struct i2c_client *client,
 {
        struct iio_dev *iio;
        struct adc081c *adc;
+       struct adcxx1c_model *model = &adcxx1c_models[id->driver_data];
        int err;
 
        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
@@ -81,6 +119,7 @@ static int adc081c_probe(struct i2c_client *client,
 
        adc = iio_priv(iio);
        adc->i2c = client;
+       adc->bits = model->bits;
 
        adc->ref = devm_regulator_get(&client->dev, "vref");
        if (IS_ERR(adc->ref))
@@ -124,7 +163,9 @@ static int adc081c_remove(struct i2c_client *client)
 }
 
 static const struct i2c_device_id adc081c_id[] = {
-       { "adc081c", 0 },
+       { "adc081c", ADC081C },
+       { "adc101c", ADC101C },
+       { "adc121c", ADC121C },
        { }
 };
 MODULE_DEVICE_TABLE(i2c, adc081c_id);
@@ -132,6 +173,8 @@ MODULE_DEVICE_TABLE(i2c, adc081c_id);
 #ifdef CONFIG_OF
 static const struct of_device_id adc081c_of_match[] = {
        { .compatible = "ti,adc081c" },
+       { .compatible = "ti,adc101c" },
+       { .compatible = "ti,adc121c" },
        { }
 };
 MODULE_DEVICE_TABLE(of, adc081c_of_match);
@@ -149,5 +192,5 @@ static struct i2c_driver adc081c_driver = {
 module_i2c_driver(adc081c_driver);
 
 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
-MODULE_DESCRIPTION("Texas Instruments ADC081C021/027 driver");
+MODULE_DESCRIPTION("Texas Instruments ADC081C/ADC101C/ADC121C driver");
 MODULE_LICENSE("GPL v2");