From 9e912f452931b3da9d13d716a381ba0d5fb74ced Mon Sep 17 00:00:00 2001 From: Grazvydas Ignotas Date: Tue, 15 Feb 2011 23:27:35 +0200 Subject: bq27x00: Use single i2c_transfer call for property read Doing this by using 2 calls sometimes results in unexpected values being returned on OMAP3 i2c controller. Signed-off-by: Grazvydas Ignotas Signed-off-by: Lars-Peter Clausen --- drivers/power/bq27x00_battery.c | 27 +++++++++++---------------- 1 file changed, 11 insertions(+), 16 deletions(-) (limited to 'drivers/power') diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index 740a0ac29dd..59e68dbd028 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -565,31 +565,26 @@ static DEFINE_MUTEX(battery_mutex); static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single) { struct i2c_client *client = to_i2c_client(di->dev); - struct i2c_msg msg; + struct i2c_msg msg[2]; unsigned char data[2]; int ret; if (!client->adapter) return -ENODEV; - msg.addr = client->addr; - msg.flags = 0; - msg.len = 1; - msg.buf = data; - - data[0] = reg; - ret = i2c_transfer(client->adapter, &msg, 1); - - if (ret < 0) - return ret; - + msg[0].addr = client->addr; + msg[0].flags = 0; + msg[0].buf = ® + msg[0].len = sizeof(reg); + msg[1].addr = client->addr; + msg[1].flags = I2C_M_RD; + msg[1].buf = data; if (single) - msg.len = 1; + msg[1].len = 1; else - msg.len = 2; + msg[1].len = 2; - msg.flags = I2C_M_RD; - ret = i2c_transfer(client->adapter, &msg, 1); + ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); if (ret < 0) return ret; -- cgit v1.2.3-18-g5258