[PATCH v4 2/8] thermal: qcom: tsens-8916: Add support for 8916 family of SoCs
Rajendra Nayak
rnayak at codeaurora.org
Wed Nov 4 23:10:18 PST 2015
On 11/03/2015 02:12 AM, Eduardo Valentin wrote:
> On Fri, Oct 09, 2015 at 03:11:04PM +0530, Rajendra Nayak wrote:
>> Add support to calibrate sensors on 8916 family and also add common
>> functions to read temperature from sensors (This can be reused on
>> other SoCs having similar TSENS device)
>> The calibration data is read from eeprom using the generic nvmem
>> framework apis.
>>
>> Based on the original code by Siddartha Mohanadoss and Stephen Boyd.
>>
>> Signed-off-by: Rajendra Nayak <rnayak at codeaurora.org>
>> ---
>> drivers/thermal/qcom/Makefile | 2 +-
>> drivers/thermal/qcom/tsens-8916.c | 107 +++++++++++++++++++++++++++++
>> drivers/thermal/qcom/tsens-common.c | 130 ++++++++++++++++++++++++++++++++++++
>
> Just a small comment on organization, does it make sense to move tsens-common
> addition to the first patch, and then leave this patch only with the
> support for 8916 (like you did for the other chips)?
So the common code gets used for 8916 and hence I added it here as part of this patch.
I can as well move it to the first patch in the series, should not be an issue.
>
>> drivers/thermal/qcom/tsens.c | 1 +
>> drivers/thermal/qcom/tsens.h | 11 +++
>> 5 files changed, 250 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/thermal/qcom/tsens-8916.c
>> create mode 100644 drivers/thermal/qcom/tsens-common.c
>>
>> diff --git a/drivers/thermal/qcom/Makefile b/drivers/thermal/qcom/Makefile
>> index 401069b..05c98e4 100644
>> --- a/drivers/thermal/qcom/Makefile
>> +++ b/drivers/thermal/qcom/Makefile
>> @@ -1,2 +1,2 @@
>> obj-$(CONFIG_QCOM_TSENS) += qcom_tsens.o
>> -qcom_tsens-y += tsens.o
>> +qcom_tsens-y += tsens.o tsens-common.o tsens-8916.o
>> diff --git a/drivers/thermal/qcom/tsens-8916.c b/drivers/thermal/qcom/tsens-8916.c
>> new file mode 100644
>> index 0000000..a69aea3
>> --- /dev/null
>> +++ b/drivers/thermal/qcom/tsens-8916.c
>> @@ -0,0 +1,107 @@
>> +/*
>> + * 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/platform_device.h>
>> +#include "tsens.h"
>> +
>> +/* eeprom layout data for 8916 */
>> +#define BASE0_MASK 0x0000007f
>> +#define BASE1_MASK 0xfe000000
>> +#define BASE0_SHIFT 0
>> +#define BASE1_SHIFT 25
>> +
>> +#define S0_P1_MASK 0x00000f80
>> +#define S1_P1_MASK 0x003e0000
>> +#define S2_P1_MASK 0xf8000000
>> +#define S3_P1_MASK 0x000003e0
>> +#define S4_P1_MASK 0x000f8000
>> +
>> +#define S0_P2_MASK 0x0001f000
>> +#define S1_P2_MASK 0x07c00000
>> +#define S2_P2_MASK 0x0000001f
>> +#define S3_P2_MASK 0x00007c00
>> +#define S4_P2_MASK 0x01f00000
>> +
>> +#define S0_P1_SHIFT 7
>> +#define S1_P1_SHIFT 17
>> +#define S2_P1_SHIFT 27
>> +#define S3_P1_SHIFT 5
>> +#define S4_P1_SHIFT 15
>> +
>> +#define S0_P2_SHIFT 12
>> +#define S1_P2_SHIFT 22
>> +#define S2_P2_SHIFT 0
>> +#define S3_P2_SHIFT 10
>> +#define S4_P2_SHIFT 20
>> +
>> +#define CAL_SEL_MASK 0xe0000000
>> +#define CAL_SEL_SHIFT 29
>> +
>> +static int calibrate_8916(struct tsens_device *tmdev)
>> +{
>> + int base0 = 0, base1 = 0, i;
>> + u32 p1[5], p2[5];
>> + int mode = 0;
>> + u32 *qfprom_cdata, *qfprom_csel;
>> +
>> + qfprom_cdata = (u32 *)qfprom_read(tmdev->dev, "calib");
>> + if (IS_ERR(qfprom_cdata))
>> + return PTR_ERR(qfprom_cdata);
>> +
>> + qfprom_csel = (u32 *)qfprom_read(tmdev->dev, "calib_sel");
>> + if (IS_ERR(qfprom_csel))
>> + return PTR_ERR(qfprom_csel);
>> +
>> + mode = (qfprom_csel[0] & CAL_SEL_MASK) >> CAL_SEL_SHIFT;
>> + dev_dbg(tmdev->dev, "calibration mode is %d\n", mode);
>> +
>> + switch (mode) {
>> + case TWO_PT_CALIB:
>> + base1 = (qfprom_cdata[1] & BASE1_MASK) >> BASE1_SHIFT;
>> + p2[0] = (qfprom_cdata[0] & S0_P2_MASK) >> S0_P2_SHIFT;
>> + p2[1] = (qfprom_cdata[0] & S1_P2_MASK) >> S1_P2_SHIFT;
>> + p2[2] = (qfprom_cdata[1] & S2_P2_MASK) >> S2_P2_SHIFT;
>> + p2[3] = (qfprom_cdata[1] & S3_P2_MASK) >> S3_P2_SHIFT;
>> + p2[4] = (qfprom_cdata[1] & S4_P2_MASK) >> S4_P2_SHIFT;
>> + for (i = 0; i < tmdev->num_sensors; i++)
>> + p2[i] = ((base1 + p2[i]) << 3);
>> + /* Fall through */
>> + case ONE_PT_CALIB2:
>> + base0 = (qfprom_cdata[0] & BASE0_MASK);
>> + p1[0] = (qfprom_cdata[0] & S0_P1_MASK) >> S0_P1_SHIFT;
>> + p1[1] = (qfprom_cdata[0] & S1_P1_MASK) >> S1_P1_SHIFT;
>> + p1[2] = (qfprom_cdata[0] & S2_P1_MASK) >> S2_P1_SHIFT;
>> + p1[3] = (qfprom_cdata[1] & S3_P1_MASK) >> S3_P1_SHIFT;
>> + p1[4] = (qfprom_cdata[1] & S4_P1_MASK) >> S4_P1_SHIFT;
>> + for (i = 0; i < tmdev->num_sensors; i++)
>> + p1[i] = (((base0) + p1[i]) << 3);
>> + break;
>> + default:
>> + for (i = 0; i < tmdev->num_sensors; i++) {
>> + p1[i] = 500;
>> + p2[i] = 780;
>> + }
>> + break;
>> + }
>> +
>> + compute_intercept_slope(tmdev, p1, p2, mode);
>> +
>> + return 0;
>
> Can calibration fail ? In which cases?
yes, it can if the eeprom reads fail for instance.
>
>> +}
>> +
>> +const struct tsens_ops ops_8916 = {
>> + .init = init_common,
>> + .calibrate = calibrate_8916,
>> + .get_temp = get_temp_common,
>> +};
>> diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
>> new file mode 100644
>> index 0000000..4acf52c
>> --- /dev/null
>> +++ b/drivers/thermal/qcom/tsens-common.c
>> @@ -0,0 +1,130 @@
>> +/*
>> + * 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/platform_device.h>
>> +#include <linux/nvmem-consumer.h>
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/of_address.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
>> +
>> +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);
> nip: add a blank line here.
>> + return ret;
>> +}
>> +
>> +void compute_intercept_slope(struct tsens_device *tmdev, u32 *p1,
>> + u32 *p2, u32 mode)
>> +{
>> + 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]);
>> +
>> + 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);
>> + }
>> +}
>> +
>> +static inline int code_to_degc(u32 adc_code, const struct tsens_sensor *s)
>> +{
>> + int degc, num, den;
>> +
>> + num = (adc_code * SLOPE_FACTOR) - s->offset;
>> + den = s->slope;
>> +
>> + if (num > 0)
>> + degc = num + (den / 2);
>> + else if (num < 0)
>> + degc = num - (den / 2);
>> + else
>> + degc = num;
>> +
>> + degc /= den;
>> +
>> + return degc;
>> +}
>> +
>> +int get_temp_common(struct tsens_device *tmdev, int id, int *temp)
>> +{
>> + struct tsens_sensor *s = &tmdev->sensor[id];
>> + u32 code;
>> + unsigned int sensor_addr;
>> + int last_temp = 0, ret;
>> +
>> + sensor_addr = S0_ST_ADDR + s->hw_id * SN_ADDR_OFFSET;
>> + ret = regmap_read(tmdev->map, sensor_addr, &code);
>> + if (ret)
>> + return ret;
>> + last_temp = code & SN_ST_TEMP_MASK;
>> +
>> + *temp = code_to_degc(last_temp, s) * 1000;
>> +
>> + return 0;
>> +}
>> +
>> +static const struct regmap_config tsens_config = {
>> + .reg_bits = 32,
>> + .val_bits = 32,
>> + .reg_stride = 4,
>> +};
>> +
>> +int init_common(struct tsens_device *tmdev)
>> +{
>> + void __iomem *base;
>> +
>> + base = of_iomap(tmdev->dev->of_node, 0);
>> + if (IS_ERR(base))
>> + return -EINVAL;
>> +
>> + tmdev->map = devm_regmap_init_mmio(tmdev->dev, base, &tsens_config);
>
> Should this function be marked as __init so devm_* works?
>
>> + if (!tmdev->map)
>> + return -ENODEV;
>
> Should you do iounmap?
yes, will fix these.
thanks,
Rajendra
>
>> +
>> + return 0;
>> +}
>> diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
>> index 87f5215..3d49293 100644
>> --- a/drivers/thermal/qcom/tsens.c
>> +++ b/drivers/thermal/qcom/tsens.c
>> @@ -65,6 +65,7 @@ static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume);
>> static const struct of_device_id tsens_table[] = {
>> {
>> .compatible = "qcom,msm8916-tsens",
>> + .data = &ops_8916,
>> }, {
>> .compatible = "qcom,msm8974-tsens",
>> },
>> diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
>> index f0fc353..0923822 100644
>> --- a/drivers/thermal/qcom/tsens.h
>> +++ b/drivers/thermal/qcom/tsens.h
>> @@ -13,6 +13,10 @@
>> #ifndef __QCOM_TSENS_H__
>> #define __QCOM_TSENS_H__
>>
>> +#define ONE_PT_CALIB 0x1
>> +#define ONE_PT_CALIB2 0x2
>> +#define TWO_PT_CALIB 0x3
>> +
>> struct tsens_device;
>>
>> struct tsens_sensor {
>> @@ -55,4 +59,11 @@ struct tsens_device {
>> struct tsens_sensor sensor[0];
>> };
>>
>> +char *qfprom_read(struct device *, const char *);
>> +void compute_intercept_slope(struct tsens_device *, u32 *, u32 *, u32);
>> +int init_common(struct tsens_device *);
>> +int get_temp_common(struct tsens_device *, int, int *);
>> +
>> +extern const struct tsens_ops ops_8916;
>> +
>> #endif /* __QCOM_TSENS_H__ */
>> --
>> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
>> of Code Aurora Forum, hosted by The Linux Foundation
>>
--
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