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Commit 2f440b06 authored by J Keerthy's avatar J Keerthy Committed by Greg Kroah-Hartman
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staging: ti-soc-thermal:Introduce ti_bandgap_get_trend function for OMAP5 



The patch adds ti_bandgap_get_trend function. This is specific
to OMAP5 for now it computes the trend from the temp values stored
in the hardware history buffer.

Formula: (T1 - T2) / P.

Where:
                T1: Last read valid temperature.
                T2: Last but one read valid temperature.
                P:  Update Interval.

Signed-off-by: default avatarJ Keerthy <j-keerthy@ti.com>
Signed-off-by: default avatarEduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 54b59c92

drivers/staging/ti-soc-thermal/ti-bandgap.c

+67 −0
Original line number Original line Diff line number Diff line
@@ -961,6 +961,73 @@ static int ti_bandgap_set_continuous_mode(struct ti_bandgap *bgp) 
	return 0;

	return 0;

}

}





/**

 * ti_bandgap_get_trend() - To fetch the temperature trend of a sensor

 * @bgp: pointer to struct ti_bandgap

 * @id: id of the individual sensor

 * @trend: Pointer to trend.

 *

 * This function needs to be called to fetch the temperature trend of a

 * Particular sensor. The function computes the difference in temperature

 * w.r.t time. For the bandgaps with built in history buffer the temperatures

 * are read from the buffer and for those without the Buffer -ENOTSUPP is

 * returned.

 *

 * Return: 0 if no error, else return corresponding error. If no

 *		error then the trend value is passed on to trend parameter

 */

int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend)

{

	struct temp_sensor_registers *tsr;

	u32 temp1, temp2, reg1, reg2;

	int t1, t2, interval, ret = 0;



	ret = ti_bandgap_validate(bgp, id);

	if (ret)

		goto exit;



	if (!TI_BANDGAP_HAS(bgp, HISTORY_BUFFER) ||

	    !TI_BANDGAP_HAS(bgp, FREEZE_BIT)) {

		ret = -ENOTSUPP;

		goto exit;

	}



	tsr = bgp->conf->sensors[id].registers;



	/* Freeze and read the last 2 valid readings */

	reg1 = tsr->ctrl_dtemp_1;

	reg2 = tsr->ctrl_dtemp_2;



	/* read temperature from history buffer */

	temp1 = ti_bandgap_readl(bgp, reg1);

	temp1 &= tsr->bgap_dtemp_mask;



	temp2 = ti_bandgap_readl(bgp, reg2);

	temp2 &= tsr->bgap_dtemp_mask;



	/* Convert from adc values to mCelsius temperature */

	ret = ti_bandgap_adc_to_mcelsius(bgp, temp1, &t1);

	if (ret)

		goto exit;



	ret = ti_bandgap_adc_to_mcelsius(bgp, temp2, &t2);

	if (ret)

		goto exit;



	/* Fetch the update interval */

	ret = ti_bandgap_read_update_interval(bgp, id, &interval);

	if (ret || !interval)

		goto exit;



	*trend = (t1 - t2) / interval;



	dev_dbg(bgp->dev, "The temperatures are t1 = %d and t2 = %d and trend =%d\n",

		t1, t2, *trend);



exit:

	return ret;

}



/**

/**

 * ti_bandgap_tshut_init() - setup and initialize tshut handling

 * ti_bandgap_tshut_init() - setup and initialize tshut handling

 * @bgp: pointer to struct ti_bandgap

 * @bgp: pointer to struct ti_bandgap

drivers/staging/ti-soc-thermal/ti-bandgap.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -382,6 +382,7 @@ int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id, 
				  int *temperature);

				  int *temperature);

int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data);

int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data);

void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id);

void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id);

int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend);





#ifdef CONFIG_OMAP4_THERMAL

#ifdef CONFIG_OMAP4_THERMAL

extern const struct ti_bandgap_data omap4430_data;

extern const struct ti_bandgap_data omap4430_data;