static inline void i2c_stop(struct efx_i2c_interface *i2c)
{
EFX_WARN_ON_PARANOID(i2c->scl != 0);
setsda(i2c, 0);
setscl(i2c, 1);
setsda(i2c, 1);
}
static inline void i2c_send_bit(struct efx_i2c_interface *i2c, int bit)
{
EFX_WARN_ON_PARANOID(i2c->scl != 0);
setsda(i2c, bit);
setscl(i2c, 1);
setscl(i2c, 0);
setsda(i2c, 1);
}
static inline void stop(struct i2c *base)
{
setsda(base, 0); // set next data bit
delay_quarter_clock();
setscl(base, 1); // this is like sending a 0 bit
delay_half_clock();
setsda(base, 1); // but switch data during clock -> STOP
delay_quarter_clock();
}
static inline void i2c_start(struct efx_i2c_interface *i2c)
{
/* We may be restarting immediately after a {send,recv}_bit,
* so SCL will not necessarily already be high.
*/
EFX_WARN_ON_PARANOID(!i2c->sda);
setscl(i2c, 1);
setsda(i2c, 0);
setscl(i2c, 0);
setsda(i2c, 1);
}
static u8 wait_9bit(struct tc300k_data *data)
{
int i;
int buf;
u8 send_buf = 0;
gpio_direction_input(data->pdata->gpio_sda);
s3c_gpio_setpull(data->pdata->gpio_sda, S3C_GPIO_PULL_NONE);
getsda(data);
ndelay(10);
setscl(data, 1);
ndelay(40);
setscl(data, 0);
ndelay(20);
for (i = 0; i < 8; i++) {
setscl(data, 1);
ndelay(20);
buf = getsda(data);
ndelay(20);
setscl(data, 0);
ndelay(20);
send_buf |= (buf & 0x01) << i;
}
setsda(data, 0);
return send_buf;
}
static inline void busidle(struct i2c *base)
{
/*
* float the SCL and SDA lines. The lines have pull-ups
*/
setscl(base, 1);
setsda(base, 1);
}
static inline void start(struct i2c *base)
{
busidle(base);
delay_full_clock();
setsda(base, 0); // switch data during SCL=H -> this is START
delay_quarter_clock();
setscl(base, 0); // switch clock -> prepare for bits
// printf("start\n");
}
static inline void i2c_release(struct efx_i2c_interface *i2c)
{
EFX_WARN_ON_PARANOID(!i2c->scl);
EFX_WARN_ON_PARANOID(!i2c->sda);
/* Devices may time out if operations do not end */
setscl(i2c, 1);
setsda(i2c, 1);
EFX_BUG_ON_PARANOID(getsda(i2c) != 1);
EFX_BUG_ON_PARANOID(getscl(i2c) != 1);
}
static inline void write_bit(struct i2c *base, int bit)
{
// printf("write bit %d\n", bit);
setsda(base, bit);
delay_quarter_clock();
setscl(base, 1);
delay_half_clock();
setscl(base, 0);
delay_quarter_clock();
}
static inline int read_bit(struct i2c *base)
{
int bit;
setsda(base, 1); // so that we can read from the OC line...
delay_quarter_clock();
setscl(base, 1);
delay_half_clock();
setscl(base, 0);
bit = getsda(base);
delay_quarter_clock();
// printf("read bit %d\n", bit);
return bit;
}
static void send_9bit(struct tc300k_data *data, u8 buff)
{
int i;
setscl(data, 1);
ndelay(20);
setsda(data, 0);
ndelay(20);
setscl(data, 0);
ndelay(20);
for (i = 0; i < 8; i++) {
setscl(data, 1);
ndelay(20);
setsda(data, (buff >> i) & 0x01);
ndelay(20);
setscl(data, 0);
ndelay(20);
}
setsda(data, 0);
}
static inline void sdahi(struct i2c_algo_bit_data *adap)
{
setsda(adap, 1);
udelay((adap->udelay + 1) / 2);
}
