Eric Lee / smarc-ti-linux-kernel

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Commit 13b2e3a5c422daa63f1e913cf25462cb9c40dcd0

Authored by Lars-Peter Clausen
Committed by Greg Kroah-Hartman
1 parent 8d622085d6

iio: ad799x: Fix ad7991/ad7995/ad7999 config setup 

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>

Showing 1 changed file with 13 additions and 2 deletions Side-by-side Diff

drivers/iio/adc/ad799x.c
Diff comments   View file @ 13b2e3a
... ... @@ -143,9 +143,15 @@
143 143 case ad7998:
144 144 return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
145 145 val);
146   - default:
  146 + case ad7992:
  147 + case ad7993:
  148 + case ad7994:
147 149 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
148 150 val);
  151 + default:
  152 + /* Will be written when doing a conversion */
  153 + st->config = val;
  154 + return 0;
149 155 }
150 156 }
151 157  
152 158  
... ... @@ -155,8 +161,13 @@
155 161 case ad7997:
156 162 case ad7998:
157 163 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
158   - default:
  164 + case ad7992:
  165 + case ad7993:
  166 + case ad7994:
159 167 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
  168 + default:
  169 + /* No readback support */
  170 + return st->config;
160 171 }
161 172 }
162 173