void i2c_write_read(i2c_package * package_write, i2c_package * package_read)
{
package_write->write_read = 1;
package_read->write_read = 1;
i2c_op(package_write); // I2C wirite operation first
i2c_op(package_read); // just followed by I2C read operation
return;
}
static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd)
{
unsigned char data;
if (pd->pos == pd->msg->len) {
i2c_op(pd, OP_TX_STOP, 0);
return 1;
}
sh_mobile_i2c_get_data(pd, &data);
i2c_op(pd, sh_mobile_i2c_is_first_byte(pd) ? OP_TX_FIRST : OP_TX, data);
pd->pos++;
return 0;
}
static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
struct i2c_msg *msgs,
int num)
{
struct sh_mobile_i2c_data *pd = i2c_get_adapdata(adapter);
struct i2c_msg *msg;
int err = 0;
int i;
long timeout;
/* Wake up device and enable clock */
pm_runtime_get_sync(pd->dev);
/* Process all messages */
for (i = 0; i < num; i++) {
bool do_start = pd->send_stop || !i;
msg = &msgs[i];
pd->send_stop = i == num - 1 || msg->flags & I2C_M_STOP;
pd->stop_after_dma = false;
start_ch(pd, msg, do_start);
if (do_start)
i2c_op(pd, OP_START, 0);
/* The interrupt handler takes care of the rest... */
timeout = wait_event_timeout(pd->wait,
pd->sr & (ICSR_TACK | SW_DONE),
adapter->timeout);
/* 'stop_after_dma' tells if DMA transfer was complete */
i2c_put_dma_safe_msg_buf(pd->dma_buf, pd->msg, pd->stop_after_dma);
if (!timeout) {
dev_err(pd->dev, "Transfer request timed out\n");
if (pd->dma_direction != DMA_NONE)
sh_mobile_i2c_cleanup_dma(pd);
err = -ETIMEDOUT;
break;
}
if (pd->send_stop)
err = poll_busy(pd);
else
err = poll_dte(pd);
if (err < 0)
break;
}
/* Disable channel */
iic_wr(pd, ICCR, ICCR_SCP);
/* Disable clock and mark device as idle */
pm_runtime_put_sync(pd->dev);
return err ?: num;
}
static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd)
{
unsigned char data;
if (pd->pos == pd->msg->len)
return 1;
sh_mobile_i2c_get_data(pd, &data);
if (sh_mobile_i2c_is_last_byte(pd))
i2c_op(pd, OP_TX_STOP, data);
else if (sh_mobile_i2c_is_first_byte(pd))
i2c_op(pd, OP_TX_FIRST, data);
else
i2c_op(pd, OP_TX, data);
pd->pos++;
return 0;
}
void motor_i2c_set_pwm(uint8_t mot_i2c_dev_addr, uint8_t pwm)
{
i2c_package package;
package.data[0] = pwm; // PWM value to be set
package.length = 1; // 1 bytes for PWM setting
package.direction = I2C_WRITE; // I2C write operation
package.slave_address = mot_i2c_dev_addr; // I2C slave address of selected motor controller
package.bus_number = MOT_I2C_BUS_NUMBER; // number of the I2C bus, that the motor controller is connected to
package.write_read = 0; // no repeated start condition
package.i2c_done_handler = NULL; // nothing to be done at I2C completion
i2c_op(&package);
}
static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
struct i2c_msg *msgs,
int num)
{
struct sh_mobile_i2c_data *pd = i2c_get_adapdata(adapter);
struct i2c_msg *msg;
int err = 0;
int i, k;
activate_ch(pd);
/* Process all messages */
for (i = 0; i < num; i++) {
bool do_start = pd->send_stop || !i;
msg = &msgs[i];
pd->send_stop = i == num - 1 || msg->flags & I2C_M_STOP;
err = start_ch(pd, msg, do_start);
if (err)
break;
if (do_start)
i2c_op(pd, OP_START, 0);
/* The interrupt handler takes care of the rest... */
k = wait_event_timeout(pd->wait,
pd->sr & (ICSR_TACK | SW_DONE),
5 * HZ);
if (!k) {
dev_err(pd->dev, "Transfer request timed out\n");
err = -ETIMEDOUT;
break;
}
if (pd->send_stop)
err = poll_busy(pd);
else
err = poll_dte(pd);
if (err < 0)
break;
}
deactivate_ch(pd);
if (!err)
err = num;
return err;
}
static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd)
{
unsigned char data;
int real_pos;
do {
if (pd->pos <= -1) {
sh_mobile_i2c_get_data(pd, &data);
if (sh_mobile_i2c_is_first_byte(pd))
i2c_op(pd, OP_TX_FIRST, data);
else
i2c_op(pd, OP_TX, data);
break;
}
if (pd->pos == 0) {
i2c_op(pd, OP_TX_TO_RX, 0);
break;
}
real_pos = pd->pos - 2;
if (pd->pos == pd->msg->len) {
if (pd->stop_after_dma) {
/* Simulate PIO end condition after DMA transfer */
i2c_op(pd, OP_RX_STOP, 0);
pd->pos++;
break;
}
if (real_pos < 0) {
i2c_op(pd, OP_RX_STOP, 0);
break;
}
data = i2c_op(pd, OP_RX_STOP_DATA, 0);
} else if (real_pos >= 0) {
data = i2c_op(pd, OP_RX, 0);
}
if (real_pos >= 0)
pd->msg->buf[real_pos] = data;
} while (0);
pd->pos++;
return pd->pos == (pd->msg->len + 2);
}
static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
struct i2c_msg *msgs,
int num)
{
struct sh_mobile_i2c_data *pd = i2c_get_adapdata(adapter);
struct i2c_msg *msg;
int err = 0;
u_int8_t val;
int i, k, retry_count;
activate_ch(pd);
/* Process all messages */
for (i = 0; i < num; i++) {
msg = &msgs[i];
err = start_ch(pd, msg);
if (err)
break;
i2c_op(pd, OP_START, 0);
/* The interrupt handler takes care of the rest... */
k = wait_event_timeout(pd->wait,
pd->sr & (ICSR_TACK | SW_DONE),
5 * HZ);
if (!k)
dev_err(pd->dev, "Transfer request timed out\n");
retry_count = 1000;
again:
val = iic_rd(pd, ICSR);
dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr);
/* the interrupt handler may wake us up before the
* transfer is finished, so poll the hardware
* until we're done.
*/
if (val & ICSR_BUSY) {
udelay(10);
if (retry_count--)
goto again;
err = -EIO;
dev_err(pd->dev, "Polling timed out\n");
break;
}
/* handle missing acknowledge and arbitration lost */
if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) {
err = -EIO;
break;
}
}
deactivate_ch(pd);
if (!err)
err = num;
return err;
}
