iio: adc: Add Texas Instruments ADC081C021/027 support

Add support for reading conversion results from the ADC and provide them
through a single IIO channel. A proper scaling factor is also exported
based on the reference voltage provided by a regulator.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

3 files changed, 173 insertions, 0 deletions

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 408557b02441..961b8d0a4bac 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -115,4 +115,14 @@ config MAX1363
           max11646, max11647) Provides direct access via sysfs and buffered
           data via the iio dev interface.
 
+config TI_ADC081C
+        tristate "Texas Instruments ADC081C021/027"
+        depends on I2C
+        help
+          If you say yes here you get support for Texas Instruments ADC081C021
+          and ADC081C027 ADC chips.
+
+          This driver can also be built as a module. If so, the module will be
+          called ti-adc081c.
+
 endmenu
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 78202d9eb961..472fd7cd2417 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -12,3 +12,5 @@ obj-$(CONFIG_AD7887) += ad7887.o
 obj-$(CONFIG_AT91_ADC) += at91_adc.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
 obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
+
diff --git a/drivers/iio/adc/ti-adc081c.c b/drivers/iio/adc/ti-adc081c.c
new file mode 100644
index 000000000000..f4a46dd8f43b
--- /dev/null
+++ b/drivers/iio/adc/ti-adc081c.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2012 Avionic Design GmbH
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/regulator/consumer.h>
+
+struct adc081c {
+        struct i2c_client *i2c;
+        struct regulator *ref;
+};
+
+#define REG_CONV_RES 0x00
+
+static int adc081c_read_raw(struct iio_dev *iio,
+                            struct iio_chan_spec const *channel, int *value,
+                            int *shift, long mask)
+{
+        struct adc081c *adc = iio_priv(iio);
+        int err;
+
+        switch (mask) {
+        case IIO_CHAN_INFO_RAW:
+                err = i2c_smbus_read_word_swapped(adc->i2c, REG_CONV_RES);
+                if (err < 0)
+                        return err;
+
+                *value = (err >> 4) & 0xff;
+                return IIO_VAL_INT;
+
+        case IIO_CHAN_INFO_SCALE:
+                err = regulator_get_voltage(adc->ref);
+                if (err < 0)
+                        return err;
+
+                *value = err / 1000;
+                *shift = 8;
+
+                return IIO_VAL_FRACTIONAL_LOG2;
+
+        default:
+                break;
+        }
+
+        return -EINVAL;
+}
+
+static const struct iio_chan_spec adc081c_channel = {
+        .type = IIO_VOLTAGE,
+        .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT |
+                     IIO_CHAN_INFO_RAW_SEPARATE_BIT,
+};
+
+static const struct iio_info adc081c_info = {
+        .read_raw = adc081c_read_raw,
+        .driver_module = THIS_MODULE,
+};
+
+static int adc081c_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
+{
+        struct iio_dev *iio;
+        struct adc081c *adc;
+        int err;
+
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+                return -ENODEV;
+
+        iio = iio_device_alloc(sizeof(*adc));
+        if (!iio)
+                return -ENOMEM;
+
+        adc = iio_priv(iio);
+        adc->i2c = client;
+
+        adc->ref = regulator_get(&client->dev, "vref");
+        if (IS_ERR(adc->ref)) {
+                err = PTR_ERR(adc->ref);
+                goto iio_free;
+        }
+
+        err = regulator_enable(adc->ref);
+        if (err < 0)
+                goto regulator_put;
+
+        iio->dev.parent = &client->dev;
+        iio->name = dev_name(&client->dev);
+        iio->modes = INDIO_DIRECT_MODE;
+        iio->info = &adc081c_info;
+
+        iio->channels = &adc081c_channel;
+        iio->num_channels = 1;
+
+        err = iio_device_register(iio);
+        if (err < 0)
+                goto regulator_disable;
+
+        i2c_set_clientdata(client, iio);
+
+        return 0;
+
+regulator_disable:
+        regulator_disable(adc->ref);
+regulator_put:
+        regulator_put(adc->ref);
+iio_free:
+        iio_device_free(iio);
+
+        return err;
+}
+
+static int adc081c_remove(struct i2c_client *client)
+{
+        struct iio_dev *iio = i2c_get_clientdata(client);
+        struct adc081c *adc = iio_priv(iio);
+
+        iio_device_unregister(iio);
+        regulator_disable(adc->ref);
+        regulator_put(adc->ref);
+        iio_device_free(iio);
+
+        return 0;
+}
+
+static const struct i2c_device_id adc081c_id[] = {
+        { "adc081c", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, adc081c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id adc081c_of_match[] = {
+        { .compatible = "ti,adc081c" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, adc081c_of_match);
+#endif
+
+static struct i2c_driver adc081c_driver = {
+        .driver = {
+                .name = "adc081c",
+                .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(adc081c_of_match),
+        },
+        .probe = adc081c_probe,
+        .remove = adc081c_remove,
+        .id_table = adc081c_id,
+};
+module_i2c_driver(adc081c_driver);
+
+MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
+MODULE_DESCRIPTION("Texas Instruments ADC081C021/027 driver");
+MODULE_LICENSE("GPL v2");