diff options
Diffstat (limited to 'drivers/media/dvb/frontends/dib0070.c')
| -rw-r--r-- | drivers/media/dvb/frontends/dib0070.c | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/drivers/media/dvb/frontends/dib0070.c b/drivers/media/dvb/frontends/dib0070.c index d4e466a90e43..1d47d4da7d4c 100644 --- a/drivers/media/dvb/frontends/dib0070.c +++ b/drivers/media/dvb/frontends/dib0070.c @@ -73,27 +73,47 @@ struct dib0070_state { u8 wbd_gain_current; u16 wbd_offset_3_3[2]; + + /* for the I2C transfer */ + struct i2c_msg msg[2]; + u8 i2c_write_buffer[3]; + u8 i2c_read_buffer[2]; }; static uint16_t dib0070_read_reg(struct dib0070_state *state, u8 reg) { - u8 b[2]; - struct i2c_msg msg[2] = { - { .addr = state->cfg->i2c_address, .flags = 0, .buf = ®, .len = 1 }, - { .addr = state->cfg->i2c_address, .flags = I2C_M_RD, .buf = b, .len = 2 }, - }; - if (i2c_transfer(state->i2c, msg, 2) != 2) { + state->i2c_write_buffer[0] = reg; + + memset(state->msg, 0, 2 * sizeof(struct i2c_msg)); + state->msg[0].addr = state->cfg->i2c_address; + state->msg[0].flags = 0; + state->msg[0].buf = state->i2c_write_buffer; + state->msg[0].len = 1; + state->msg[1].addr = state->cfg->i2c_address; + state->msg[1].flags = I2C_M_RD; + state->msg[1].buf = state->i2c_read_buffer; + state->msg[1].len = 2; + + if (i2c_transfer(state->i2c, state->msg, 2) != 2) { printk(KERN_WARNING "DiB0070 I2C read failed\n"); return 0; } - return (b[0] << 8) | b[1]; + return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1]; } static int dib0070_write_reg(struct dib0070_state *state, u8 reg, u16 val) { - u8 b[3] = { reg, val >> 8, val & 0xff }; - struct i2c_msg msg = { .addr = state->cfg->i2c_address, .flags = 0, .buf = b, .len = 3 }; - if (i2c_transfer(state->i2c, &msg, 1) != 1) { + state->i2c_write_buffer[0] = reg; + state->i2c_write_buffer[1] = val >> 8; + state->i2c_write_buffer[2] = val & 0xff; + + memset(state->msg, 0, sizeof(struct i2c_msg)); + state->msg[0].addr = state->cfg->i2c_address; + state->msg[0].flags = 0; + state->msg[0].buf = state->i2c_write_buffer; + state->msg[0].len = 3; + + if (i2c_transfer(state->i2c, state->msg, 1) != 1) { printk(KERN_WARNING "DiB0070 I2C write failed\n"); return -EREMOTEIO; } |