Add support for Microchip Technology's MCP3426/7/8 ADC

This patch extends previous mcp3422 driver to support
missing members of the family, mcp3426/7/8.

Signed-off-by: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

2 files changed, 32 insertions, 8 deletions

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index a0368119c275..1dffa2d56262 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -157,11 +157,12 @@ config MCP320X
           called mcp320x.
 
 config MCP3422
-        tristate "Microchip Technology MCP3422/3/4 driver"
+        tristate "Microchip Technology MCP3422/3/4/6/7/8 driver"
         depends on I2C
         help
-          Say yes here to build support for Microchip Technology's MCP3422,
-          MCP3423 or MCP3424 analog to digital converters.
+          Say yes here to build support for Microchip Technology's
+          MCP3422, MCP3423, MCP3424, MCP3426, MCP3427 or MCP3428
+          analog to digital converters.
 
           This driver can also be built as a module. If so, the module will be
           called mcp3422.
diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
index 47dcb34ff44c..51672256072b 100644
--- a/drivers/iio/adc/mcp3422.c
+++ b/drivers/iio/adc/mcp3422.c
@@ -1,10 +1,11 @@
 /*
- * mcp3422.c - driver for the Microchip mcp3422/3/4 chip family
+ * mcp3422.c - driver for the Microchip mcp3422/3/4/6/7/8 chip family
  *
  * Copyright (C) 2013, Angelo Compagnucci
  * Author: Angelo Compagnucci <angelo.compagnucci@gmail.com>
  *
  * Datasheet: http://ww1.microchip.com/downloads/en/devicedoc/22088b.pdf
+ *            http://ww1.microchip.com/downloads/en/DeviceDoc/22226a.pdf
  *
  * This driver exports the value of analog input voltage to sysfs, the
  * voltage unit is nV.
@@ -96,6 +97,7 @@ static const int mcp3422_sign_extend[4] = {
 /* Client data (each client gets its own) */
 struct mcp3422 {
         struct i2c_client *i2c;
+        u8 id;
         u8 config;
         u8 pga[4];
         struct mutex lock;
@@ -238,6 +240,8 @@ static int mcp3422_write_raw(struct iio_dev *iio,
                         temp = MCP3422_SRATE_15;
                         break;
                 case 3:
+                        if (adc->id > 4)
+                                return -EINVAL;
                         temp = MCP3422_SRATE_3;
                         break;
                 default:
@@ -271,6 +275,17 @@ static int mcp3422_write_raw_get_fmt(struct iio_dev *indio_dev,
         }
 }
 
+static ssize_t mcp3422_show_samp_freqs(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mcp3422 *adc = iio_priv(dev_to_iio_dev(dev));
+
+        if (adc->id > 4)
+                return sprintf(buf, "240 60 15\n");
+
+        return sprintf(buf, "240 60 15 3\n");
+}
+
 static ssize_t mcp3422_show_scales(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
@@ -284,12 +299,13 @@ static ssize_t mcp3422_show_scales(struct device *dev,
                 mcp3422_scales[sample_rate][3]);
 }
 
-static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("240 60 15 3");
+static IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO,
+                mcp3422_show_samp_freqs, NULL, 0);
 static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO,
                 mcp3422_show_scales, NULL, 0);
 
 static struct attribute *mcp3422_attributes[] = {
-        &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+        &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
         &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
         NULL,
 };
@@ -335,6 +351,7 @@ static int mcp3422_probe(struct i2c_client *client,
 
         adc = iio_priv(indio_dev);
         adc->i2c = client;
+        adc->id = (u8)(id->driver_data);
 
         mutex_init(&adc->lock);
 
@@ -343,13 +360,16 @@ static int mcp3422_probe(struct i2c_client *client,
         indio_dev->modes = INDIO_DIRECT_MODE;
         indio_dev->info = &mcp3422_info;
 
-        switch ((unsigned int)(id->driver_data)) {
+        switch (adc->id) {
         case 2:
         case 3:
+        case 6:
+        case 7:
                 indio_dev->channels = mcp3422_channels;
                 indio_dev->num_channels = ARRAY_SIZE(mcp3422_channels);
                 break;
         case 4:
+        case 8:
                 indio_dev->channels = mcp3424_channels;
                 indio_dev->num_channels = ARRAY_SIZE(mcp3424_channels);
                 break;
@@ -375,6 +395,9 @@ static const struct i2c_device_id mcp3422_id[] = {
         { "mcp3422", 2 },
         { "mcp3423", 3 },
         { "mcp3424", 4 },
+        { "mcp3426", 6 },
+        { "mcp3427", 7 },
+        { "mcp3428", 8 },
         { }
 };
 MODULE_DEVICE_TABLE(i2c, mcp3422_id);
@@ -399,5 +422,5 @@ static struct i2c_driver mcp3422_driver = {
 module_i2c_driver(mcp3422_driver);
 
 MODULE_AUTHOR("Angelo Compagnucci <angelo.compagnucci@gmail.com>");
-MODULE_DESCRIPTION("Microchip mcp3422/3/4 driver");
+MODULE_DESCRIPTION("Microchip mcp3422/3/4/6/7/8 driver");
 MODULE_LICENSE("GPL v2");