staging:iio:adc: AD7780: Use private data space from iio_allocate_device + trivial...

Use private data space from iio_allocate_device
Drop dev_data in favour of iio_priv()
Fix typo in gpio name
Fix error return path, free gpio
Make scale_uv type unsigned long

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index 14b16b5d4b1abc84df2f20102206144d76ea800c..06d3b6aca544f0c9d0d865c77b8ab165847b49c0 100644 (file)
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -40,7 +40,6 @@ struct ad7780_chip_info {
 };
 
 struct ad7780_state {
-       struct iio_dev                  *indio_dev;
        struct spi_device               *spi;
        const struct ad7780_chip_info   *chip_info;
        struct regulator                *reg;
@@ -92,9 +91,10 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
                           int *val2,
                           long m)
 {
-       int ret, smpl;
-       struct ad7780_state *st = indio_dev->dev_data;
-       unsigned int scale_uv;
+       struct ad7780_state *st = iio_priv(indio_dev);
+       struct iio_chan_spec channel = st->chip_info->channel;
+       int ret, smpl = 0;
+       unsigned long scale_uv;
 
        switch (m) {
        case 0:
@@ -109,11 +109,9 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
                        !((smpl & AD7780_PAT0) && !(smpl & AD7780_PAT1)))
                        return -EIO;
 
-               *val = (smpl >> st->chip_info->channel.scan_type.shift) &
-                       ((1 << (st->chip_info->channel.scan_type.realbits))
-                       - 1);
-               *val -= (1 << (st->chip_info->channel.scan_type.realbits
-                       - 1));
+               *val = (smpl >> channel.scan_type.shift) &
+                       ((1 << (channel.scan_type.realbits)) - 1);
+               *val -= (1 << (channel.scan_type.realbits - 1));
 
                if (!(smpl & AD7780_GAIN))
                        *val *= 128;
@@ -121,7 +119,7 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
                return IIO_VAL_INT;
        case (1 << IIO_CHAN_INFO_SCALE_SHARED):
                scale_uv = (st->int_vref_mv * 100000)
-                       >> (st->chip_info->channel.scan_type.realbits - 1);
+                       >> (channel.scan_type.realbits - 1);
                *val =  scale_uv / 100000;
                *val2 = (scale_uv % 100000) * 10;
                return IIO_VAL_INT_PLUS_MICRO;
@@ -159,6 +157,7 @@ static int __devinit ad7780_probe(struct spi_device *spi)
 {
        struct ad7780_platform_data *pdata = spi->dev.platform_data;
        struct ad7780_state *st;
+       struct iio_dev *indio_dev;
        int ret, voltage_uv = 0;
 
        if (!pdata) {
@@ -166,11 +165,11 @@ static int __devinit ad7780_probe(struct spi_device *spi)
                return -ENODEV;
        }
 
-       st = kzalloc(sizeof(*st), GFP_KERNEL);
-       if (st == NULL) {
-               ret = -ENOMEM;
-               goto error_ret;
-       }
+       indio_dev = iio_allocate_device(sizeof(*st));
+       if (indio_dev == NULL)
+               return -ENOMEM;
+
+       st = iio_priv(indio_dev);
 
        st->reg = regulator_get(&spi->dev, "vcc");
        if (!IS_ERR(st->reg)) {
@@ -193,24 +192,16 @@ static int __devinit ad7780_probe(struct spi_device *spi)
        else
                dev_warn(&spi->dev, "reference voltage unspecified\n");
 
-       spi_set_drvdata(spi, st);
+       spi_set_drvdata(spi, indio_dev);
        st->spi = spi;
 
-       st->indio_dev = iio_allocate_device(0);
-       if (st->indio_dev == NULL) {
-               ret = -ENOMEM;
-               goto error_disable_reg;
-       }
-
-       /* Establish that the iio_dev is a child of the spi device */
-       st->indio_dev->dev.parent = &spi->dev;
-       st->indio_dev->name = spi_get_device_id(spi)->name;
-       st->indio_dev->dev_data = (void *)(st);
-       st->indio_dev->driver_module = THIS_MODULE;
-       st->indio_dev->modes = INDIO_DIRECT_MODE;
-       st->indio_dev->channels = &st->chip_info->channel;
-       st->indio_dev->num_channels = 1;
-       st->indio_dev->read_raw = &ad7780_read_raw;
+       indio_dev->dev.parent = &spi->dev;
+       indio_dev->name = spi_get_device_id(spi)->name;
+       indio_dev->driver_module = THIS_MODULE;
+       indio_dev->modes = INDIO_DIRECT_MODE;
+       indio_dev->channels = &st->chip_info->channel;
+       indio_dev->num_channels = 1;
+       indio_dev->read_raw = &ad7780_read_raw;
 
        init_waitqueue_head(&st->wq_data_avail);
 
@@ -223,20 +214,20 @@ static int __devinit ad7780_probe(struct spi_device *spi)
        spi_message_add_tail(&st->xfer, &st->msg);
 
        ret = gpio_request_one(st->pdata->gpio_pdrst, GPIOF_OUT_INIT_LOW,
-                              "AD7877 /PDRST");
+                              "AD7780 /PDRST");
        if (ret) {
                dev_err(&spi->dev, "failed to request GPIO PDRST\n");
-               goto error_free_device;
+               goto error_disable_reg;
        }
 
        ret = request_irq(spi->irq, ad7780_interrupt,
                IRQF_TRIGGER_FALLING, spi_get_device_id(spi)->name, st);
        if (ret)
-               goto error_free_device;
+               goto error_free_gpio;
 
        disable_irq(spi->irq);
 
-       ret = iio_device_register(st->indio_dev);
+       ret = iio_device_register(indio_dev);
        if (ret)
                goto error_free_irq;
 
@@ -244,32 +235,33 @@ static int __devinit ad7780_probe(struct spi_device *spi)
 
 error_free_irq:
        free_irq(spi->irq, st);
-
-error_free_device:
-       iio_free_device(st->indio_dev);
+error_free_gpio:
+       gpio_free(st->pdata->gpio_pdrst);
 error_disable_reg:
        if (!IS_ERR(st->reg))
                regulator_disable(st->reg);
 error_put_reg:
        if (!IS_ERR(st->reg))
                regulator_put(st->reg);
-       kfree(st);
-error_ret:
+
+       iio_free_device(indio_dev);
+
        return ret;
 }
 
 static int ad7780_remove(struct spi_device *spi)
 {
-       struct ad7780_state *st = spi_get_drvdata(spi);
-       struct iio_dev *indio_dev = st->indio_dev;
+       struct iio_dev *indio_dev = spi_get_drvdata(spi);
+       struct ad7780_state *st = iio_priv(indio_dev);
+
        free_irq(spi->irq, st);
        gpio_free(st->pdata->gpio_pdrst);
-       iio_device_unregister(indio_dev);
        if (!IS_ERR(st->reg)) {
                regulator_disable(st->reg);
                regulator_put(st->reg);
        }
-       kfree(st);
+       iio_device_unregister(indio_dev);
+
        return 0;
 }