diff options
Diffstat (limited to 'drivers/media/dvb/frontends/dib7000m.c')
-rw-r--r-- | drivers/media/dvb/frontends/dib7000m.c | 49 |
1 files changed, 32 insertions, 17 deletions
diff --git a/drivers/media/dvb/frontends/dib7000m.c b/drivers/media/dvb/frontends/dib7000m.c index 289a79837f2..79cb1c20df2 100644 --- a/drivers/media/dvb/frontends/dib7000m.c +++ b/drivers/media/dvb/frontends/dib7000m.c @@ -50,6 +50,11 @@ struct dib7000m_state { u16 revision; u8 agc_state; + + /* for the I2C transfer */ + struct i2c_msg msg[2]; + u8 i2c_write_buffer[4]; + u8 i2c_read_buffer[2]; }; enum dib7000m_power_mode { @@ -64,29 +69,39 @@ enum dib7000m_power_mode { static u16 dib7000m_read_word(struct dib7000m_state *state, u16 reg) { - u8 wb[2] = { (reg >> 8) | 0x80, reg & 0xff }; - u8 rb[2]; - struct i2c_msg msg[2] = { - { .addr = state->i2c_addr >> 1, .flags = 0, .buf = wb, .len = 2 }, - { .addr = state->i2c_addr >> 1, .flags = I2C_M_RD, .buf = rb, .len = 2 }, - }; - - if (i2c_transfer(state->i2c_adap, msg, 2) != 2) + state->i2c_write_buffer[0] = (reg >> 8) | 0x80; + state->i2c_write_buffer[1] = reg & 0xff; + + memset(state->msg, 0, 2 * sizeof(struct i2c_msg)); + state->msg[0].addr = state->i2c_addr >> 1; + state->msg[0].flags = 0; + state->msg[0].buf = state->i2c_write_buffer; + state->msg[0].len = 2; + state->msg[1].addr = state->i2c_addr >> 1; + 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_adap, state->msg, 2) != 2) dprintk("i2c read error on %d",reg); - return (rb[0] << 8) | rb[1]; + return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1]; } static int dib7000m_write_word(struct dib7000m_state *state, u16 reg, u16 val) { - u8 b[4] = { - (reg >> 8) & 0xff, reg & 0xff, - (val >> 8) & 0xff, val & 0xff, - }; - struct i2c_msg msg = { - .addr = state->i2c_addr >> 1, .flags = 0, .buf = b, .len = 4 - }; - return i2c_transfer(state->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0; + state->i2c_write_buffer[0] = (reg >> 8) & 0xff; + state->i2c_write_buffer[1] = reg & 0xff; + state->i2c_write_buffer[2] = (val >> 8) & 0xff; + state->i2c_write_buffer[3] = val & 0xff; + + memset(&state->msg[0], 0, sizeof(struct i2c_msg)); + state->msg[0].addr = state->i2c_addr >> 1; + state->msg[0].flags = 0; + state->msg[0].buf = state->i2c_write_buffer; + state->msg[0].len = 4; + + return i2c_transfer(state->i2c_adap, state->msg, 1) != 1 ? -EREMOTEIO : 0; } static void dib7000m_write_tab(struct dib7000m_state *state, u16 *buf) { |