* @reg: desired register (offset) to be read
*
* Helper function to read bandgap registers. It uses the io remapped area.
- * Returns the register value.
+ * Return: the register value.
*/
static u32 ti_bandgap_readl(struct ti_bandgap *bgp, u32 reg)
{
*
* Used to power on/off a bandgap device instance. Only used on those
* that features tempsoff bit.
+ *
+ * Return: 0 on success, -ENOTSUPP if tempsoff is not supported.
*/
static int ti_bandgap_power(struct ti_bandgap *bgp, bool on)
{
* This function is desired because, depending on bandgap device version,
* it might be needed to freeze the bandgap state machine, before fetching
* the register value.
+ *
+ * Return: temperature in ADC values.
*/
static u32 ti_bandgap_read_temp(struct ti_bandgap *bgp, int id)
{
* conditions and acts accordingly. In case there are events pending,
* it will reset the event mask to wait for the opposite event (next event).
* Every time there is a new event, it will be reported to thermal layer.
+ *
+ * Return: IRQ_HANDLED
*/
static irqreturn_t ti_bandgap_talert_irq_handler(int irq, void *data)
{
* This is the Tshut handler. Use it only if bandgap device features
* HAS(TSHUT). If any sensor fires the Tshut signal, we simply shutdown
* the system.
+ *
+ * Return: IRQ_HANDLED
*/
static irqreturn_t ti_bandgap_tshut_irq_handler(int irq, void *data)
{
* Simple conversion from ADC representation to mCelsius. In case the ADC value
* is out of the ADC conv table range, it returns -ERANGE, 0 on success.
* The conversion table is indexed by the ADC values.
+ *
+ * Return: 0 if conversion was successful, else -ERANGE in case the @adc_val
+ * argument is out of the ADC conv table range.
*/
static
int ti_bandgap_adc_to_mcelsius(struct ti_bandgap *bgp, int adc_val, int *t)
* Simple conversion from mCelsius to ADC values. In case the temp value
* is out of the ADC conv table range, it returns -ERANGE, 0 on success.
* The conversion table is indexed by the ADC values.
+ *
+ * Return: 0 if conversion was successful, else -ERANGE in case the @temp
+ * argument is out of the ADC conv table range.
*/
static
int ti_bandgap_mcelsius_to_adc(struct ti_bandgap *bgp, long temp, int *adc)
* @sum: address where to write the resulting temperature (in ADC scale)
*
* Adds an hysteresis value (in mCelsius) to a ADC temperature value.
- * Returns 0 on success, -ERANGE otherwise.
+ *
+ * Return: 0 on success, -ERANGE otherwise.
*/
static
int ti_bandgap_add_hyst(struct ti_bandgap *bgp, int adc_val, int hyst_val,
* It checks the resulting t_hot and t_cold values, based on the new passed @val
* and configures the thresholds so that t_hot is always greater than t_cold.
* Call this function only if bandgap features HAS(TALERT).
+ *
+ * Return: 0 if no error, else corresponding error
*/
static int ti_bandgap_update_alert_threshold(struct ti_bandgap *bgp, int id,
int val, bool hot)
*
* Checks if the bandgap pointer is valid and if the sensor id is also
* applicable.
+ *
+ * Return: 0 if no errors, -EINVAL for invalid @bgp pointer or -ERANGE if
+ * @id cannot index @bgp sensors.
*/
static inline int ti_bandgap_validate(struct ti_bandgap *bgp, int id)
{
* This function can be used to update t_hot or t_cold, depending on @hot value.
* Validates the mCelsius range and update the requested threshold.
* Call this function only if bandgap features HAS(TALERT).
+ *
+ * Return: 0 if no error, else corresponding error value.
*/
static int _ti_bandgap_write_threshold(struct ti_bandgap *bgp, int id, int val,
bool hot)
* It will fetch the required thresholds (hot and cold) for TALERT signal.
* This function can be used to read t_hot or t_cold, depending on @hot value.
* Call this function only if bandgap features HAS(TALERT).
+ *
+ * Return: 0 if no error, -ENOTSUPP if it has no TALERT support, or the
+ * corresponding error value if some operation fails.
*/
static int _ti_bandgap_read_threshold(struct ti_bandgap *bgp, int id,
int *val, bool hot)
* @id: sensor id
* @thot: resulting current thot value
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_read_thot(struct ti_bandgap *bgp, int id, int *thot)
{
* @id: sensor id
* @val: desired thot value
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_write_thot(struct ti_bandgap *bgp, int id, int val)
{
* @id: sensor id
* @tcold: resulting current tcold value
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_read_tcold(struct ti_bandgap *bgp, int id, int *tcold)
{
* @id: sensor id
* @val: desired tcold value
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_write_tcold(struct ti_bandgap *bgp, int id, int val)
{
* @id: sensor id
* @interval: resulting update interval in miliseconds
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id,
int *interval)
* @id: sensor id
* @interval: desired update interval in miliseconds
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_write_update_interval(struct ti_bandgap *bgp,
int id, u32 interval)
* @id: sensor id
* @temperature: resulting temperature
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id,
int *temperature)
* @id: sensor id
* @data: thermal framework related data to be stored
*
- * returns 0 on success or the proper error code
+ * Return: 0 on success or the proper error code
*/
int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data)
{
* @bgp: pointer to bandgap instance
* @id: sensor id
*
- * returns data stored by set function with sensor id on success or NULL
+ * Return: data stored by set function with sensor id on success or NULL
*/
void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id)
{
*
* Used to initialize the conversion state machine and set it to a valid
* state. Called during device initialization and context restore events.
+ *
+ * Return: 0
*/
static int
ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
* be used for junction temperature monitoring, it is desirable that the
* sensors are operational all the time, so that alerts are generated
* properly.
+ *
+ * Return: 0
*/
static int ti_bandgap_set_continuous_mode(struct ti_bandgap *bgp)
{
* to specify which GPIO line is used. TSHUT IRQ is fired anytime
* one of the bandgap sensors violates the TSHUT high/hot threshold.
* And in that case, the system must go off.
+ *
+ * Return: 0 if no error, else error status
*/
static int ti_bandgap_tshut_init(struct ti_bandgap *bgp,
struct platform_device *pdev)
* TALERT is a normal IRQ and it is fired any time thresholds (hot or cold)
* are violated. In these situation, the driver must reprogram the thresholds,
* accordingly to specified policy.
+ *
+ * Return: 0 if no error, else return corresponding error.
*/
static int ti_bandgap_talert_init(struct ti_bandgap *bgp,
struct platform_device *pdev)
* Used to read the device tree properties accordingly to the bandgap
* matching version. Based on bandgap version and its capabilities it
* will build a struct ti_bandgap out of the required DT entries.
+ *
+ * Return: valid bandgap structure if successful, else returns ERR_PTR
+ * return value must be verified with IS_ERR.
*/
static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev)
{
projects / ~andy / linux / commitdiff