From 74614f8d9d4141a3752fc1c38706859b63f4842b Mon Sep 17 00:00:00 2001
From: Daniel Mack <daniel@caiaq.de>
Date: Wed, 6 May 2009 16:03:00 -0700
Subject: [PATCH] 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>
---
drivers/misc/isl29003.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/isl29003.c b/drivers/misc/isl29003.c
index 2e2a5923d4c2..a71e245801ee 100644
--- a/drivers/misc/isl29003.c
+++ b/drivers/misc/isl29003.c
@@ -64,6 +64,7 @@ struct isl29003_data {
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 @@ static int __devexit isl29003_remove(struct i2c_client *client)
#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 @@ static int isl29003_resume(struct i2c_client *client)
/* 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
--
2.30.9