| From 2eacc608b3bf3519fc353c558454873f4589146d Mon Sep 17 00:00:00 2001 |
| From: Lars-Peter Clausen <lars@metafoo.de> |
| Date: Wed, 26 Nov 2014 11:35:35 +0100 |
| Subject: iio: ad799x: Fix ad7991/ad7995/ad7999 config setup |
| |
| From: Lars-Peter Clausen <lars@metafoo.de> |
| |
| commit 2eacc608b3bf3519fc353c558454873f4589146d upstream. |
| |
| The ad7991/ad7995/ad7999 does not have a configuration register like the |
| other devices that can be written and read. The configuration is written as |
| part of the conversion sequence. |
| |
| Fixes: 0f7ddcc1bff1 ("iio:adc:ad799x: Write default config on probe and reset alert status on probe") |
| Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> |
| Tested-by: Mike Looijmans <mike.looijmans@topic.nl> |
| Signed-off-by: Jonathan Cameron <jic23@kernel.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/iio/adc/ad799x.c | 15 +++++++++++++-- |
| 1 file changed, 13 insertions(+), 2 deletions(-) |
| |
| --- a/drivers/iio/adc/ad799x.c |
| +++ b/drivers/iio/adc/ad799x.c |
| @@ -143,9 +143,15 @@ static int ad799x_write_config(struct ad |
| case ad7998: |
| return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG, |
| val); |
| - default: |
| + case ad7992: |
| + case ad7993: |
| + case ad7994: |
| return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG, |
| val); |
| + default: |
| + /* Will be written when doing a conversion */ |
| + st->config = val; |
| + return 0; |
| } |
| } |
| |
| @@ -155,8 +161,13 @@ static int ad799x_read_config(struct ad7 |
| case ad7997: |
| case ad7998: |
| return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG); |
| - default: |
| + case ad7992: |
| + case ad7993: |
| + case ad7994: |
| return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG); |
| + default: |
| + /* No readback support */ |
| + return st->config; |
| } |
| } |
| |