isl29003: fix resume functionality
The isl29003 does not interpret the return value of
i2c_smbus_write_byte_data() correctly and hence causes an error on system
resume.
Also introduce power_state_before_suspend and restore the chip's power
state upon wakeup.
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/misc/isl29003.c b/drivers/misc/isl29003.c
index 2e2a592..a71e245 100644
--- a/drivers/misc/isl29003.c
+++ b/drivers/misc/isl29003.c
@@ -64,6 +64,7 @@
struct i2c_client *client;
struct mutex lock;
u8 reg_cache[ISL29003_NUM_CACHABLE_REGS];
+ u8 power_state_before_suspend;
};
static int gain_range[] = {
@@ -411,6 +412,9 @@
#ifdef CONFIG_PM
static int isl29003_suspend(struct i2c_client *client, pm_message_t mesg)
{
+ struct isl29003_data *data = i2c_get_clientdata(client);
+
+ data->power_state_before_suspend = isl29003_get_power_state(client);
return isl29003_set_power_state(client, 0);
}
@@ -421,10 +425,11 @@
/* restore registers from cache */
for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
- if (!i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
+ if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
return -EIO;
- return 0;
+ return isl29003_set_power_state(client,
+ data->power_state_before_suspend);
}
#else
