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staging: iio: ad7816: Do not use busy_pin in case of AD7818

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AD7818 does not support busy_pin functionality as per datasheet.
Hence drop busy_pin when AD7818 is used.

Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nishad Kamdar 2018-11-09 13:06:24 +05:30 committed by Jonathan Cameron
parent 723a61e0a7
commit 06c77f564d
1 changed files with 24 additions and 11 deletions
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35
drivers/staging/iio/adc/ad7816.c
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@ -43,6 +43,7 @@
*/
struct ad7816_chip_info {
kernel_ulong_t id;
struct spi_device *spi_dev;
struct gpio_desc *rdwr_pin;
struct gpio_desc *convert_pin;
@ -52,6 +53,12 @@ struct ad7816_chip_info {
u8 mode;
};
enum ad7816_type {
ID_AD7816,
ID_AD7817,
ID_AD7818,
};
/*
* ad7816 data access by SPI
*/
@ -78,8 +85,10 @@ static int ad7816_spi_read(struct ad7816_chip_info *chip, u16 *data)
gpiod_set_value(chip->convert_pin, 1);
}
while (gpiod_get_value(chip->busy_pin))
cpu_relax();
if (chip->id == ID_AD7816 || chip->id == ID_AD7817) {
while (gpiod_get_value(chip->busy_pin))
cpu_relax();
}
gpiod_set_value(chip->rdwr_pin, 0);
gpiod_set_value(chip->rdwr_pin, 1);
@ -359,6 +368,7 @@ static int ad7816_probe(struct spi_device *spi_dev)
for (i = 0; i <= AD7816_CS_MAX; i++)
chip->oti_data[i] = 203;
chip->id = spi_get_device_id(spi_dev)->driver_data;
chip->rdwr_pin = devm_gpiod_get(&spi_dev->dev, "rdwr", GPIOD_IN);
if (IS_ERR(chip->rdwr_pin)) {
ret = PTR_ERR(chip->rdwr_pin);
@ -373,12 +383,15 @@ static int ad7816_probe(struct spi_device *spi_dev)
ret);
return ret;
}
chip->busy_pin = devm_gpiod_get(&spi_dev->dev, "busy", GPIOD_IN);
if (IS_ERR(chip->busy_pin)) {
ret = PTR_ERR(chip->busy_pin);
dev_err(&spi_dev->dev, "Failed to request busy GPIO: %d\n",
ret);
return ret;
if (chip->id == ID_AD7816 || chip->id == ID_AD7817) {
chip->busy_pin = devm_gpiod_get(&spi_dev->dev, "busy",
GPIOD_IN);
if (IS_ERR(chip->busy_pin)) {
ret = PTR_ERR(chip->busy_pin);
dev_err(&spi_dev->dev, "Failed to request busy GPIO: %d\n",
ret);
return ret;
}
}
indio_dev->name = spi_get_device_id(spi_dev)->name;
@ -409,9 +422,9 @@ static int ad7816_probe(struct spi_device *spi_dev)
}
static const struct spi_device_id ad7816_id[] = {
{ "ad7816", 0 },
{ "ad7817", 0 },
{ "ad7818", 0 },
{ "ad7816", ID_AD7816 },
{ "ad7817", ID_AD7817 },
{ "ad7818", ID_AD7818 },
{}
};