diff options
| -rw-r--r-- | drivers/media/video/cx25840/cx25840-core.c | 58 |
1 files changed, 39 insertions, 19 deletions
diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c index bb4872b2ceb0..4f908fa4da08 100644 --- a/drivers/media/video/cx25840/cx25840-core.c +++ b/drivers/media/video/cx25840/cx25840-core.c @@ -80,33 +80,53 @@ int cx25840_write4(struct i2c_client *client, u16 addr, u32 value) u8 cx25840_read(struct i2c_client * client, u16 addr) { - u8 buffer[2]; - buffer[0] = addr >> 8; - buffer[1] = addr & 0xff; - - if (i2c_master_send(client, buffer, 2) < 2) - return 0; - - if (i2c_master_recv(client, buffer, 1) < 1) + struct i2c_msg msgs[2]; + u8 tx_buf[2], rx_buf[1]; + + /* Write register address */ + tx_buf[0] = addr >> 8; + tx_buf[1] = addr & 0xff; + msgs[0].addr = client->addr; + msgs[0].flags = 0; + msgs[0].len = 2; + msgs[0].buf = (char *) tx_buf; + + /* Read data from register */ + msgs[1].addr = client->addr; + msgs[1].flags = I2C_M_RD; + msgs[1].len = 1; + msgs[1].buf = (char *) rx_buf; + + if (i2c_transfer(client->adapter, msgs, 2) < 2) return 0; - return buffer[0]; + return rx_buf[0]; } u32 cx25840_read4(struct i2c_client * client, u16 addr) { - u8 buffer[4]; - buffer[0] = addr >> 8; - buffer[1] = addr & 0xff; - - if (i2c_master_send(client, buffer, 2) < 2) - return 0; - - if (i2c_master_recv(client, buffer, 4) < 4) + struct i2c_msg msgs[2]; + u8 tx_buf[2], rx_buf[4]; + + /* Write register address */ + tx_buf[0] = addr >> 8; + tx_buf[1] = addr & 0xff; + msgs[0].addr = client->addr; + msgs[0].flags = 0; + msgs[0].len = 2; + msgs[0].buf = (char *) tx_buf; + + /* Read data from registers */ + msgs[1].addr = client->addr; + msgs[1].flags = I2C_M_RD; + msgs[1].len = 4; + msgs[1].buf = (char *) rx_buf; + + if (i2c_transfer(client->adapter, msgs, 2) < 2) return 0; - return (buffer[3] << 24) | (buffer[2] << 16) | - (buffer[1] << 8) | buffer[0]; + return (rx_buf[3] << 24) | (rx_buf[2] << 16) | (rx_buf[1] << 8) | + rx_buf[0]; } int cx25840_and_or(struct i2c_client *client, u16 addr, unsigned and_mask, |