| Message ID | 1460626319-14516-2-git-send-email-rnayak@codeaurora.org (mailing list archive) |
|---|---|
| State | Changes Requested |
| Delegated to: | Eduardo Valentin |
| Headers | show |
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@codeaurora.org> > Reviewed-by: Lina Iyer <lina.iyer@linaro.org> > --- > .../devicetree/bindings/thermal/qcom-tsens.txt | 21 +++ > drivers/thermal/Kconfig | 5 + > drivers/thermal/Makefile | 1 + > drivers/thermal/qcom/Kconfig | 11 ++ > drivers/thermal/qcom/Makefile | 2 + > drivers/thermal/qcom/tsens-common.c | 135 ++++++++++++++ > drivers/thermal/qcom/tsens.c | 202 +++++++++++++++++++++ > drivers/thermal/qcom/tsens.h | 90 +++++++++ > 8 files changed, 467 insertions(+) > create mode 100644 Documentation/devicetree/bindings/thermal/qcom-tsens.txt > create mode 100644 drivers/thermal/qcom/Kconfig > create mode 100644 drivers/thermal/qcom/Makefile > create mode 100644 drivers/thermal/qcom/tsens-common.c > create mode 100644 drivers/thermal/qcom/tsens.c > create mode 100644 drivers/thermal/qcom/tsens.h > > diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt > new file mode 100644 > index 0000000..292ed89 > --- /dev/null > +++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt > @@ -0,0 +1,21 @@ > +* QCOM SoC Temperature Sensor (TSENS) > + > +Required properties: > +- compatible : > + - "qcom,msm8916-tsens" : For 8916 Family of SoCs > + - "qcom,msm8974-tsens" : For 8974 Family of SoCs > + - "qcom,msm8996-tsens" : For 8996 Family of SoCs > + > +- reg: Address range of the thermal registers > +- #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description. > +- Refer to Documentation/devicetree/bindings/nvmem/nvmem.txt to know how to specify > +nvmem cells > + > +Example: > +tsens: thermal-sensor@900000 { > + compatible = "qcom,msm8916-tsens"; > + reg = <0x4a8000 0x2000>; > + nvmem-cells = <&tsens_caldata>, <&tsens_calsel>; > + nvmem-cell-names = "caldata", "calsel"; > + #thermal-sensor-cells = <1>; > + }; > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index c37eedc..463b00c 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -408,4 +408,9 @@ config QCOM_SPMI_TEMP_ALARM > real time die temperature if an ADC is present or an estimate of the > temperature based upon the over temperature stage value. > > +menu "Qualcomm thermal drivers" > +depends on (ARCH_QCOM && OF) || COMPILE_TEST > +source "drivers/thermal/qcom/Kconfig" > +endmenu > + > endif > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index 8e9cbc3..3f3e72c 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -46,6 +46,7 @@ obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/ > obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/ > obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o > obj-$(CONFIG_ST_THERMAL) += st/ > +obj-$(CONFIG_QCOM_TSENS) += qcom/ > obj-$(CONFIG_TEGRA_SOCTHERM) += tegra_soctherm.o > obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o > obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o > diff --git a/drivers/thermal/qcom/Kconfig b/drivers/thermal/qcom/Kconfig > new file mode 100644 > index 0000000..be32e5a > --- /dev/null > +++ b/drivers/thermal/qcom/Kconfig > @@ -0,0 +1,11 @@ > +config QCOM_TSENS > + tristate "Qualcomm TSENS Temperature Alarm" > + depends on THERMAL > + depends on QCOM_QFPROM > + depends on ARCH_QCOM || COMPILE_TEST > + help > + This enables the thermal sysfs driver for the TSENS device. It shows > + up in Sysfs as a thermal zone with multiple trip points. Disabling the > + thermal zone device via the mode file results in disabling the sensor. > + Also able to set threshold temperature for both hot and cold and update > + when a threshold is reached. > diff --git a/drivers/thermal/qcom/Makefile b/drivers/thermal/qcom/Makefile > new file mode 100644 > index 0000000..2e800c5 > --- /dev/null > +++ b/drivers/thermal/qcom/Makefile > @@ -0,0 +1,2 @@ > +obj-$(CONFIG_QCOM_TSENS) += qcom_tsens.o > +qcom_tsens-y += tsens.o tsens-common.o > diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c > new file mode 100644 > index 0000000..4bffbc1 > --- /dev/null > +++ b/drivers/thermal/qcom/tsens-common.c > @@ -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? > + 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); > + } > +} > + > +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 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); > + if (!tmdev->map) { > + iounmap(base); > + return -ENODEV; > + } > + > + return 0; > +} > diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c > new file mode 100644 > index 0000000..e799182 > --- /dev/null > +++ b/drivers/thermal/qcom/tsens.c > @@ -0,0 +1,202 @@ > +/* > + * 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/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/pm.h> > +#include <linux/slab.h> > +#include <linux/thermal.h> > +#include "tsens.h" > + > +static int tsens_get_temp(void *data, int *temp) > +{ > + const struct tsens_sensor *s = data; > + struct tsens_device *tmdev = s->tmdev; > + > + return tmdev->ops->get_temp(tmdev, s->id, temp); > +} > + > +static int tsens_get_trend(void *data, long *temp) > +{ > + const struct tsens_sensor *s = data; > + struct tsens_device *tmdev = s->tmdev; > + > + if (tmdev->ops->get_trend) > + return tmdev->ops->get_trend(tmdev, s->id, temp); > + > + return -ENOTSUPP; > +} > + > +static int tsens_suspend(struct device *dev) > +{ > + struct tsens_device *tmdev = dev_get_drvdata(dev); > + > + if (tmdev->ops && tmdev->ops->suspend) > + return tmdev->ops->suspend(tmdev); > + > + return 0; > +} > + > +static int tsens_resume(struct device *dev) > +{ > + struct tsens_device *tmdev = dev_get_drvdata(dev); > + > + if (tmdev->ops && tmdev->ops->resume) > + return tmdev->ops->resume(tmdev); > + > + return 0; > +} > + > +static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume); > + > +static const struct of_device_id tsens_table[] = { > + { > + .compatible = "qcom,msm8916-tsens", > + }, { > + .compatible = "qcom,msm8974-tsens", > + }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, tsens_table); > + > +static const struct thermal_zone_of_device_ops tsens_of_ops = { > + .get_temp = tsens_get_temp, > + .get_trend = tsens_get_trend, > +}; > + > +static int tsens_register(struct tsens_device *tmdev) > +{ > + int i; > + struct thermal_zone_device *tzd; > + u32 *hw_id, n = tmdev->num_sensors; > + > + hw_id = devm_kcalloc(tmdev->dev, n, sizeof(u32), GFP_KERNEL); > + if (!hw_id) > + return -ENOMEM; > + > + for (i = 0; i < tmdev->num_sensors; i++) { > + tmdev->sensor[i].tmdev = tmdev; > + tmdev->sensor[i].id = i; > + tzd = thermal_zone_of_sensor_register(tmdev->dev, i, > + &tmdev->sensor[i], > + &tsens_of_ops); How about using the devm_ version of this API? > + if (IS_ERR(tzd)) > + continue; > + tmdev->sensor[i].tzd = tzd; > + if (tmdev->ops->enable) > + tmdev->ops->enable(tmdev, i); > + } > + return 0; > +} > + > +static int tsens_probe(struct platform_device *pdev) > +{ > + int ret, i; > + struct device *dev; > + struct device_node *np; > + struct tsens_sensor *s; > + struct tsens_device *tmdev; > + const struct tsens_data *data; > + const struct of_device_id *id; > + > + if (pdev->dev.of_node) > + dev = &pdev->dev; > + else > + dev = pdev->dev.parent; > + > + np = dev->of_node; > + > + id = of_match_node(tsens_table, np); > + if (!id) > + return -EINVAL; > + > + data = id->data; > + > + if (data->num_sensors <= 0) { > + dev_err(dev, "invalid number of sensors\n"); > + return -EINVAL; > + } > + > + tmdev = devm_kzalloc(dev, sizeof(*tmdev) + > + data->num_sensors * sizeof(*s), GFP_KERNEL); > + if (!tmdev) > + return -ENOMEM; > + > + tmdev->dev = dev; > + tmdev->num_sensors = data->num_sensors; > + tmdev->ops = data->ops; > + for (i = 0; i < tmdev->num_sensors; i++) { > + if (data->hw_ids) > + tmdev->sensor[i].hw_id = data->hw_ids[i]; > + else > + tmdev->sensor[i].hw_id = i; > + } > + > + if (!tmdev->ops || !tmdev->ops->init || !tmdev->ops->get_temp) > + return -EINVAL; > + > + ret = tmdev->ops->init(tmdev); > + if (ret < 0) { > + dev_err(dev, "tsens init failed\n"); > + return ret; > + } > + > + if (tmdev->ops->calibrate) { > + ret = tmdev->ops->calibrate(tmdev); > + if (ret < 0) { > + dev_err(dev, "tsens calibration failed\n"); > + return ret; > + } > + } > + > + ret = tsens_register(tmdev); > + > + platform_set_drvdata(pdev, tmdev); > + > + return ret; > +} > + > +static int tsens_remove(struct platform_device *pdev) > +{ > + int i; > + struct tsens_device *tmdev = platform_get_drvdata(pdev); > + struct thermal_zone_device *tzd; > + > + if (tmdev->ops->disable) > + tmdev->ops->disable(tmdev); > + > + for (i = 0; i < tmdev->num_sensors; i++) { > + tzd = tmdev->sensor[i].tzd; > + thermal_zone_of_sensor_unregister(&pdev->dev, tzd); > + } > + > + return 0; > +} > + > +static struct platform_driver tsens_driver = { > + .probe = tsens_probe, > + .remove = tsens_remove, > + .driver = { > + .name = "qcom-tsens", > + .pm = &tsens_pm_ops, > + .of_match_table = tsens_table, > + }, > +}; > +module_platform_driver(tsens_driver); > + > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("QCOM Temperature Sensor driver"); > +MODULE_ALIAS("platform:qcom-tsens"); > diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h > new file mode 100644 > index 0000000..6f652ed > --- /dev/null > +++ b/drivers/thermal/qcom/tsens.h > @@ -0,0 +1,90 @@ > +/* > + * Copyright (c) 2015, The Linux Foundation. All rights reserved. > + * > + * This software is licensed under the terms of the GNU General Public > + * License version 2, as published by the Free Software Foundation, and > + * may be copied, distributed, and modified under those terms. > + * > + * 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. > + */ > +#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 { > + struct tsens_device *tmdev; > + struct thermal_zone_device *tzd; > + int offset; > + int id; > + int hw_id; > + u32 slope; > + u32 status; > +}; > + > +/** > + * struct tsens_ops - operations as supported by the tsens device > + * @init: Function to initialize the tsens device > + * @calibrate: Function to calibrate the tsens device > + * @get_temp: Function which returns the temp in millidegC > + * @enable: Function to enable (clocks/power) tsens device > + * @disable: Function to disable the tsens device > + * @suspend: Function to suspend the tsens device > + * @resume: Function to resume the tsens device > + * @get_trend: Function to get the thermal/temp trend > + */ > +struct tsens_ops { > + /* mandatory callbacks */ > + int (*init)(struct tsens_device *); > + int (*calibrate)(struct tsens_device *); > + int (*get_temp)(struct tsens_device *, int, int *); > + /* optional callbacks */ > + int (*enable)(struct tsens_device *, int); > + void (*disable)(struct tsens_device *); > + int (*suspend)(struct tsens_device *); > + int (*resume)(struct tsens_device *); > + int (*get_trend)(struct tsens_device *, int, long *); > +}; > + > +/** > + * struct tsens_data - tsens instance specific data > + * @num_sensors: Max number of sensors supported by platform > + * @ops: operations the tsens instance supports > + * @hw_ids: Subset of sensors ids supported by platform, if not the first n > + */ > +struct tsens_data { > + const u32 num_sensors; > + const struct tsens_ops *ops; > + unsigned int *hw_ids; > +}; > + > +/* Registers to be saved/restored across a context loss */ > +struct tsens_context { > + int threshold; > + int control; > +}; > + > +struct tsens_device { > + struct device *dev; > + u32 num_sensors; > + struct regmap *map; > + struct regmap_field *status_field; > + struct tsens_context ctx; > + bool trdy; > + const struct tsens_ops *ops; > + 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 *); > + > +#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 > -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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@codeaurora.org> >> Reviewed-by: Lina Iyer <lina.iyer@linaro.org> >> --- [].. >> @@ -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); >> + } >> +} []..
diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt new file mode 100644 index 0000000..292ed89 --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt @@ -0,0 +1,21 @@ +* QCOM SoC Temperature Sensor (TSENS) + +Required properties: +- compatible : + - "qcom,msm8916-tsens" : For 8916 Family of SoCs + - "qcom,msm8974-tsens" : For 8974 Family of SoCs + - "qcom,msm8996-tsens" : For 8996 Family of SoCs + +- reg: Address range of the thermal registers +- #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description. +- Refer to Documentation/devicetree/bindings/nvmem/nvmem.txt to know how to specify +nvmem cells + +Example: +tsens: thermal-sensor@900000 { + compatible = "qcom,msm8916-tsens"; + reg = <0x4a8000 0x2000>; + nvmem-cells = <&tsens_caldata>, <&tsens_calsel>; + nvmem-cell-names = "caldata", "calsel"; + #thermal-sensor-cells = <1>; + }; diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index c37eedc..463b00c 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -408,4 +408,9 @@ config QCOM_SPMI_TEMP_ALARM real time die temperature if an ADC is present or an estimate of the temperature based upon the over temperature stage value. +menu "Qualcomm thermal drivers" +depends on (ARCH_QCOM && OF) || COMPILE_TEST +source "drivers/thermal/qcom/Kconfig" +endmenu + endif diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 8e9cbc3..3f3e72c 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -46,6 +46,7 @@ obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/ obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/ obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o obj-$(CONFIG_ST_THERMAL) += st/ +obj-$(CONFIG_QCOM_TSENS) += qcom/ obj-$(CONFIG_TEGRA_SOCTHERM) += tegra_soctherm.o obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o diff --git a/drivers/thermal/qcom/Kconfig b/drivers/thermal/qcom/Kconfig new file mode 100644 index 0000000..be32e5a --- /dev/null +++ b/drivers/thermal/qcom/Kconfig @@ -0,0 +1,11 @@ +config QCOM_TSENS + tristate "Qualcomm TSENS Temperature Alarm" + depends on THERMAL + depends on QCOM_QFPROM + depends on ARCH_QCOM || COMPILE_TEST + help + This enables the thermal sysfs driver for the TSENS device. It shows + up in Sysfs as a thermal zone with multiple trip points. Disabling the + thermal zone device via the mode file results in disabling the sensor. + Also able to set threshold temperature for both hot and cold and update + when a threshold is reached. diff --git a/drivers/thermal/qcom/Makefile b/drivers/thermal/qcom/Makefile new file mode 100644 index 0000000..2e800c5 --- /dev/null +++ b/drivers/thermal/qcom/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_QCOM_TSENS) += qcom_tsens.o +qcom_tsens-y += tsens.o tsens-common.o diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c new file mode 100644 index 0000000..4bffbc1 --- /dev/null +++ b/drivers/thermal/qcom/tsens-common.c @@ -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) +{ + 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); + } +} + +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 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); + if (!tmdev->map) { + iounmap(base); + return -ENODEV; + } + + return 0; +} diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c new file mode 100644 index 0000000..e799182 --- /dev/null +++ b/drivers/thermal/qcom/tsens.c @@ -0,0 +1,202 @@ +/* + * 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/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/slab.h> +#include <linux/thermal.h> +#include "tsens.h" + +static int tsens_get_temp(void *data, int *temp) +{ + const struct tsens_sensor *s = data; + struct tsens_device *tmdev = s->tmdev; + + return tmdev->ops->get_temp(tmdev, s->id, temp); +} + +static int tsens_get_trend(void *data, long *temp) +{ + const struct tsens_sensor *s = data; + struct tsens_device *tmdev = s->tmdev; + + if (tmdev->ops->get_trend) + return tmdev->ops->get_trend(tmdev, s->id, temp); + + return -ENOTSUPP; +} + +static int tsens_suspend(struct device *dev) +{ + struct tsens_device *tmdev = dev_get_drvdata(dev); + + if (tmdev->ops && tmdev->ops->suspend) + return tmdev->ops->suspend(tmdev); + + return 0; +} + +static int tsens_resume(struct device *dev) +{ + struct tsens_device *tmdev = dev_get_drvdata(dev); + + if (tmdev->ops && tmdev->ops->resume) + return tmdev->ops->resume(tmdev); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume); + +static const struct of_device_id tsens_table[] = { + { + .compatible = "qcom,msm8916-tsens", + }, { + .compatible = "qcom,msm8974-tsens", + }, + {} +}; +MODULE_DEVICE_TABLE(of, tsens_table); + +static const struct thermal_zone_of_device_ops tsens_of_ops = { + .get_temp = tsens_get_temp, + .get_trend = tsens_get_trend, +}; + +static int tsens_register(struct tsens_device *tmdev) +{ + int i; + struct thermal_zone_device *tzd; + u32 *hw_id, n = tmdev->num_sensors; + + hw_id = devm_kcalloc(tmdev->dev, n, sizeof(u32), GFP_KERNEL); + if (!hw_id) + return -ENOMEM; + + for (i = 0; i < tmdev->num_sensors; i++) { + tmdev->sensor[i].tmdev = tmdev; + tmdev->sensor[i].id = i; + tzd = thermal_zone_of_sensor_register(tmdev->dev, i, + &tmdev->sensor[i], + &tsens_of_ops); + if (IS_ERR(tzd)) + continue; + tmdev->sensor[i].tzd = tzd; + if (tmdev->ops->enable) + tmdev->ops->enable(tmdev, i); + } + return 0; +} + +static int tsens_probe(struct platform_device *pdev) +{ + int ret, i; + struct device *dev; + struct device_node *np; + struct tsens_sensor *s; + struct tsens_device *tmdev; + const struct tsens_data *data; + const struct of_device_id *id; + + if (pdev->dev.of_node) + dev = &pdev->dev; + else + dev = pdev->dev.parent; + + np = dev->of_node; + + id = of_match_node(tsens_table, np); + if (!id) + return -EINVAL; + + data = id->data; + + if (data->num_sensors <= 0) { + dev_err(dev, "invalid number of sensors\n"); + return -EINVAL; + } + + tmdev = devm_kzalloc(dev, sizeof(*tmdev) + + data->num_sensors * sizeof(*s), GFP_KERNEL); + if (!tmdev) + return -ENOMEM; + + tmdev->dev = dev; + tmdev->num_sensors = data->num_sensors; + tmdev->ops = data->ops; + for (i = 0; i < tmdev->num_sensors; i++) { + if (data->hw_ids) + tmdev->sensor[i].hw_id = data->hw_ids[i]; + else + tmdev->sensor[i].hw_id = i; + } + + if (!tmdev->ops || !tmdev->ops->init || !tmdev->ops->get_temp) + return -EINVAL; + + ret = tmdev->ops->init(tmdev); + if (ret < 0) { + dev_err(dev, "tsens init failed\n"); + return ret; + } + + if (tmdev->ops->calibrate) { + ret = tmdev->ops->calibrate(tmdev); + if (ret < 0) { + dev_err(dev, "tsens calibration failed\n"); + return ret; + } + } + + ret = tsens_register(tmdev); + + platform_set_drvdata(pdev, tmdev); + + return ret; +} + +static int tsens_remove(struct platform_device *pdev) +{ + int i; + struct tsens_device *tmdev = platform_get_drvdata(pdev); + struct thermal_zone_device *tzd; + + if (tmdev->ops->disable) + tmdev->ops->disable(tmdev); + + for (i = 0; i < tmdev->num_sensors; i++) { + tzd = tmdev->sensor[i].tzd; + thermal_zone_of_sensor_unregister(&pdev->dev, tzd); + } + + return 0; +} + +static struct platform_driver tsens_driver = { + .probe = tsens_probe, + .remove = tsens_remove, + .driver = { + .name = "qcom-tsens", + .pm = &tsens_pm_ops, + .of_match_table = tsens_table, + }, +}; +module_platform_driver(tsens_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("QCOM Temperature Sensor driver"); +MODULE_ALIAS("platform:qcom-tsens"); diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h new file mode 100644 index 0000000..6f652ed --- /dev/null +++ b/drivers/thermal/qcom/tsens.h @@ -0,0 +1,90 @@ +/* + * Copyright (c) 2015, The Linux Foundation. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + */ +#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 { + struct tsens_device *tmdev; + struct thermal_zone_device *tzd; + int offset; + int id; + int hw_id; + u32 slope; + u32 status; +}; + +/** + * struct tsens_ops - operations as supported by the tsens device + * @init: Function to initialize the tsens device + * @calibrate: Function to calibrate the tsens device + * @get_temp: Function which returns the temp in millidegC + * @enable: Function to enable (clocks/power) tsens device + * @disable: Function to disable the tsens device + * @suspend: Function to suspend the tsens device + * @resume: Function to resume the tsens device + * @get_trend: Function to get the thermal/temp trend + */ +struct tsens_ops { + /* mandatory callbacks */ + int (*init)(struct tsens_device *); + int (*calibrate)(struct tsens_device *); + int (*get_temp)(struct tsens_device *, int, int *); + /* optional callbacks */ + int (*enable)(struct tsens_device *, int); + void (*disable)(struct tsens_device *); + int (*suspend)(struct tsens_device *); + int (*resume)(struct tsens_device *); + int (*get_trend)(struct tsens_device *, int, long *); +}; + +/** + * struct tsens_data - tsens instance specific data + * @num_sensors: Max number of sensors supported by platform + * @ops: operations the tsens instance supports + * @hw_ids: Subset of sensors ids supported by platform, if not the first n + */ +struct tsens_data { + const u32 num_sensors; + const struct tsens_ops *ops; + unsigned int *hw_ids; +}; + +/* Registers to be saved/restored across a context loss */ +struct tsens_context { + int threshold; + int control; +}; + +struct tsens_device { + struct device *dev; + u32 num_sensors; + struct regmap *map; + struct regmap_field *status_field; + struct tsens_context ctx; + bool trdy; + const struct tsens_ops *ops; + 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 *); + +#endif /* __QCOM_TSENS_H__ */