On 04/28/2016 05:50 AM, Eduardo Valentin wrote:
> On Thu, Apr 14, 2016 at 03:01:49PM +0530, Rajendra Nayak wrote:
>> TSENS is Qualcomms' thermal temperature sensor device. It
>> supports reading temperatures from multiple thermal sensors
>> present on various QCOM SoCs.
>> Calibration data is generally read from a non-volatile memory
>> (eeprom) device.
>>
>> Add a skeleton driver with all the necessary abstractions so
>> a variety of qcom device families which support TSENS can
>> add driver extensions.
>>
>> Also add the required device tree bindings which can be used
>> to describe the TSENS device in DT.
>>
>> Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx>
>> Reviewed-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
>> ---
[]..
>> @@ -0,0 +1,135 @@
>> +/*
>> + * Copyright (c) 2015, The Linux Foundation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 and
>> + * only version 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/nvmem-consumer.h>
>> +#include <linux/of_address.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +#include "tsens.h"
>> +
>> +#define S0_ST_ADDR 0x1030
>> +#define SN_ADDR_OFFSET 0x4
>> +#define SN_ST_TEMP_MASK 0x3ff
>> +#define CAL_DEGC_PT1 30
>> +#define CAL_DEGC_PT2 120
>> +#define SLOPE_FACTOR 1000
>> +#define SLOPE_DEFAULT 3200
>> +
>> +char *qfprom_read(struct device *dev, const char *cname)
>> +{
>> + struct nvmem_cell *cell;
>> + ssize_t data;
>> + char *ret;
>> +
>> + cell = nvmem_cell_get(dev, cname);
>> + if (IS_ERR(cell))
>> + return ERR_CAST(cell);
>> +
>> + ret = nvmem_cell_read(cell, &data);
>> + nvmem_cell_put(cell);
>> +
>> + return ret;
>> +}
>> +
>> +void compute_intercept_slope(struct tsens_device *tmdev, u32 *p1,
>> + u32 *p2, u32 mode)
>> +{
>
> Could you please add a comment explaining the cases that this function
> is used instead of tz->tzp->slope,offset?
sure, will do.
>
>> + int i;
>> + int num, den;
>> +
>> + for (i = 0; i < tmdev->num_sensors; i++) {
>> + dev_dbg(tmdev->dev,
>> + "sensor%d - data_point1:%#x data_point2:%#x\n",
>> + i, p1[i], p2[i]);
>> +
>> + tmdev->sensor[i].slope = SLOPE_DEFAULT;
>> + if (mode == TWO_PT_CALIB) {
>> + /*
>> + * slope (m) = adc_code2 - adc_code1 (y2 - y1)/
>> + * temp_120_degc - temp_30_degc (x2 - x1)
>> + */
>> + num = p2[i] - p1[i];
>> + num *= SLOPE_FACTOR;
>> + den = CAL_DEGC_PT2 - CAL_DEGC_PT1;
>> + tmdev->sensor[i].slope = num / den;
>> + }
>> +
>> + tmdev->sensor[i].offset = (p1[i] * SLOPE_FACTOR) -
>> + (CAL_DEGC_PT1 *
>> + tmdev->sensor[i].slope);
>> + dev_dbg(tmdev->dev, "offset:%d\n", tmdev->sensor[i].offset);
>> + }
>> +}
[]..
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