/*
* If there is any pending transaction, cannot release the bus here.
- * psp_release_i2c_bus will take care of this later.
+ * psp_release_i2c_bus() will take care of this later.
*/
if (psp_i2c_access_count)
goto cleanup;
{
mutex_lock(&psp_i2c_access_mutex);
- /* Return early if mailbox was malfunctional */
+ /* Return early if mailbox was malfunctioned */
if (psp_i2c_mbox_fail)
goto cleanup;
/*
- * If we are last owner of PSP semaphore, need to release aribtration
+ * If we are last owner of PSP semaphore, need to release arbitration
* via mailbox.
*/
psp_i2c_access_count--;
/*
* Locking methods are based on the default implementation from
- * drivers/i2c/i2c-core-base.c, but with psp acquire and release operations
+ * drivers/i2c/i2c-core-base.c, but with PSP acquire and release operations
* added. With this in place we can ensure that i2c clients on the bus shared
- * with psp are able to lock HW access to the bus for arbitrary number of
+ * with PSP are able to lock HW access to the bus for arbitrary number of
* operations - that is e.g. write-wait-read.
*/
static void i2c_adapter_dw_psp_lock_bus(struct i2c_adapter *adapter,
* Autodetects needed register access mode and creates the regmap with
* corresponding read/write callbacks. This must be called before doing any
* other register access.
+ *
+ * Return: 0 on success, or negative errno otherwise.
*/
int i2c_dw_init_regmap(struct dw_i2c_dev *dev)
{
/*
* Note we'll check the return value of the regmap IO accessors only
* at the probe stage. The rest of the code won't do this because
- * basically we have MMIO-based regmap so non of the read/write methods
+ * basically we have MMIO-based regmap, so none of the read/write methods
* can fail.
*/
dev->map = devm_regmap_init(dev->dev, NULL, dev, &map_cfg);
acpi_speed = i2c_acpi_find_bus_speed(device);
/*
- * Some DSTDs use a non standard speed, round down to the lowest
+ * Some DSDTs use a non standard speed, round down to the lowest
* standard speed.
*/
for (i = 0; i < ARRAY_SIZE(supported_speeds); i++) {
/*
* Wait 10 times the signaling period of the highest I2C
- * transfer supported by the driver (for 400KHz this is
+ * transfer supported by the driver (for 400kHz this is
* 25us) as described in the DesignWare I2C databook.
*/
usleep_range(25, 250);
#define DW_IC_SLAVE 1
/*
- * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
+ * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register.
*
- * Only expected abort codes are listed here
- * refer to the datasheet for the full list
+ * Only expected abort codes are listed here,
+ * refer to the datasheet for the full list.
*/
#define ABRT_7B_ADDR_NOACK 0
#define ABRT_10ADDR1_NOACK 1
* @rst: optional reset for the controller
* @slave: represent an I2C slave device
* @get_clk_rate_khz: callback to retrieve IP specific bus speed
- * @cmd_err: run time hadware error code
+ * @cmd_err: run time hardware error code
* @msgs: points to an array of messages currently being transferred
* @msgs_num: the number of elements in msgs
* @msg_write_idx: the element index of the current tx message in the msgs array
* @release_lock: function to release a hardware lock on the bus
* @semaphore_idx: Index of table with semaphore type attached to the bus. It's
* -1 if there is no semaphore.
- * @shared_with_punit: true if this bus is shared with the SoCs PUNIT
+ * @shared_with_punit: true if this bus is shared with the SoC's PUNIT
* @init: function to initialize the I2C hardware
* @set_sda_hold_time: callback to retrieve IP specific SDA hold timing
* @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
}
/**
- * i2c_dw_init_master() - Initialize the designware I2C master hardware
+ * i2c_dw_init_master() - Initialize the DesignWare I2C master hardware
* @dev: device private data
*
* This functions configures and enables the I2C master.
* This function is called during I2C init function, and in case of timeout at
* run time.
+ *
+ * Return: 0 on success, or negative errno otherwise.
*/
static int i2c_dw_init_master(struct dw_i2c_dev *dev)
{
/*
* Initiate the i2c read/write transaction of buffer length,
* and poll for bus busy status. For the last message transfer,
- * update the command with stopbit enable.
+ * update the command with stop bit enable.
*/
for (msg_itr_lmt = buf_len; msg_itr_lmt > 0; msg_itr_lmt--) {
if (msg_wrt_idx == num_msgs - 1 && msg_itr_lmt == 1)
/*
* Initiate (and continue) low level master read/write transaction.
- * This function is only called from i2c_dw_isr, and pumping i2c_msg
+ * This function is only called from i2c_dw_isr(), and pumping i2c_msg
* messages into the tx buffer. Even if the size of i2c_msg data is
* longer than the size of the tx buffer, it handles everything.
*/
buf = msgs[dev->msg_write_idx].buf;
buf_len = msgs[dev->msg_write_idx].len;
- /* If both IC_EMPTYFIFO_HOLD_MASTER_EN and
+ /*
+ * If both IC_EMPTYFIFO_HOLD_MASTER_EN and
* IC_RESTART_EN are set, we must manually
* set restart bit between messages.
*/
rinfo->unprepare_recovery = i2c_dw_unprepare_recovery;
adap->bus_recovery_info = rinfo;
- dev_info(dev->dev, "running with gpio recovery mode! scl%s",
+ dev_info(dev->dev, "running with GPIO recovery mode! scl%s",
rinfo->sda_gpiod ? ",sda" : "");
return 0;
return ret;
return regmap_write(dev->sysmap, BT1_I2C_CTL,
- BT1_I2C_CTL_GO | BT1_I2C_CTL_WR | (reg & BT1_I2C_CTL_ADDR_MASK));
+ BT1_I2C_CTL_GO | BT1_I2C_CTL_WR | (reg & BT1_I2C_CTL_ADDR_MASK));
}
static const struct regmap_config bt1_i2c_cfg = {
adap = &dev->adapter;
adap->owner = THIS_MODULE;
adap->class = dmi_check_system(dw_i2c_hwmon_class_dmi) ?
- I2C_CLASS_HWMON : I2C_CLASS_DEPRECATED;
+ I2C_CLASS_HWMON : I2C_CLASS_DEPRECATED;
adap->nr = -1;
if (dev->flags & ACCESS_NO_IRQ_SUSPEND)
}
/**
- * i2c_dw_init_slave() - Initialize the designware i2c slave hardware
+ * i2c_dw_init_slave() - Initialize the DesignWare i2c slave hardware
* @dev: device private data
*
* This function configures and enables the I2C in slave mode.
* This function is called during I2C init function, and in case of timeout at
* run time.
+ *
+ * Return: 0 on success, or negative errno otherwise.
*/
static int i2c_dw_init_slave(struct dw_i2c_dev *dev)
{
ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr_slave,
IRQF_SHARED, dev_name(dev->dev), dev);
if (ret) {
- dev_err(dev->dev, "failure requesting irq %i: %d\n",
+ dev_err(dev->dev, "failure requesting IRQ %i: %d\n",
dev->irq, ret);
return ret;
}
projects / thirdparty / kernel / linux.git / commitdiff
