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Date: Thu, 16 Oct 2014 17:03:45 +0300
From: "Ivan T. Ivanov" <iivanov@...sol.com>
To: Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Grant Likely <grant.likely@...aro.org>,
linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
David Collins <collinsd@...eaurora.org>
Subject: Re: [PATCH v3] thermal: Add QPNP PMIC temperature alarm driver
No responses. Probably because maintainers are
in CC: and not in To:, fixing this.
Ivan
On Wed, 2014-10-01 at 18:53 +0300, Ivan T. Ivanov wrote:
> Add support for the temperature alarm peripheral found inside
> Qualcomm plug-and-play (QPNP) PMIC chips. The temperature alarm
> peripheral outputs a pulse on an interrupt line whenever the
> thermal over temperature stage value changes. Implement an ISR
> to manage this interrupt.
>
> Register a thermal zone device in sysfs with multiple trip points
> corresponding to the physical threshold temperatures between over
> temperature stages. The temperature reported by this thermal
> zone device should reflect the actual PMIC die temperature if an
> ADC is present on the given PMIC. If no ADC is present, then the
> reported temperature should be estimated from the over
> temperature stage value.
>
> Send a notification to userspace via sysfs_notify() whenever the
> over temperature stage value changes.
>
> Cc: David Collins <collinsd@...eaurora.org>
> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> ---
>
> Changes since v2:
>
> - Fixed review comments from Kiran Padwal
> - Files renamed from qpnp-* to qcom-spmi-* to be inline with
> other PMIC sub-function drivers like qcom-spmi-iadc and
> qcom-spmi-vadc.
>
> v2: http://www.gossamer-threads.com/lists/linux/kernel/2017366
>
> .../bindings/thermal/qcom-spmi-temp-alarm.txt | 26 ++
> drivers/thermal/Kconfig | 13 +
> drivers/thermal/Makefile | 1 +
> drivers/thermal/qcom-spmi-temp-alarm.c | 517
> +++++++++++++++++++++
> 4 files changed, 557 insertions(+)
> create mode 100644
> Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
> create mode 100644 drivers/thermal/qcom-spmi-temp-alarm.c
>
> diff --git
> a/Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
> b/Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
> new file mode 100644
> index 0000000..afa908c
> --- /dev/null
> +++
> b/Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
> @@ -0,0 +1,26 @@
> +Qualcomm QPNP PMIC Temperature Alarm
> +
> +QPNP temperature alarm peripherals are found inside of Qualcomm
> PMIC chips
> +that utilize the Qualcomm SPMI implementation. These peripherals
> provide an
> +interrupt signal and status register to identify high PMIC die
> temperature.
> +
> +Required properties:
> +- compatible: Should contain "qcom,spmi-temp-alarm".
> +- reg: Specifies the SPMI address and length of the
> controller's
> + registers.
> +- interrupts: PMIC temperature alarm interrupt
> +
> +Optional properties:
> +- io-channels: Should contain IIO channel specifier for the ADC
> channel,
> + which report chip die temperature.
> +- io-channel-names: Should contain "thermal".
> +
> +Example:
> +
> + thermal-alarm@...0 {
> + compatible = "qcom,spmi-temp-alarm";
> + reg = <0x2400 0x100>;
> + interrupts = <0 0x24 0 IRQ_TYPE_EDGE_RISING>;
> + io-channels = <&pm8941_vadc VADC_DIE_TEMP>;
> + io-channel-names = "thermal";
> + };
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 693208e..6adb661 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -248,4 +248,17 @@ depends on ARCH_STI && OF
> source "drivers/thermal/st/Kconfig"
> endmenu
>
> +config QCOM_SPMI_TEMP_ALARM
> + tristate "Qualcomm SPMI PMIC Temperature Alarm"
> + depends on OF && SPMI && IIO
> + select REGMAP_SPMI
> + help
> + This enables a thermal sysfs driver for Qualcomm
> plug-and-play (QPNP)
> + PMIC devices. It shows up in sysfs as a thermal zone with
> multiple
> + trip points. The temperature reported by the thermal zone
> reflects the
> + real time die temperature if an ADC is present or an
> estimate of the
> + temperature based upon the over temperature stage value.
> Enabling the
> + thermal zone device via the mode file results in shifting
> PMIC over
> + temperature shutdown control from hardware to software.
> +
> endif
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 31e232f..55f6c23 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -33,3 +33,4 @@ obj-$(CONFIG_INTEL_SOC_DTS_THERMAL) +=
> intel_soc_dts_thermal.o
> obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/
> obj-$(CONFIG_ACPI_INT3403_THERMAL) += int3403_thermal.o
> obj-$(CONFIG_ST_THERMAL) += st/
> +obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM) += qcom-spmi-temp-alarm.o
> diff --git a/drivers/thermal/qcom-spmi-temp-alarm.c
> b/drivers/thermal/qcom-spmi-temp-alarm.c
> new file mode 100644
> index 0000000..5ce0fef
> --- /dev/null
> +++ b/drivers/thermal/qcom-spmi-temp-alarm.c
> @@ -0,0 +1,517 @@
> +/*
> + * Copyright (c) 2011-2014, 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/delay.h>
> +#include <linux/err.h>
> +#include <linux/iio/consumer.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/thermal.h>
> +
> +#define QPNP_TM_REG_TYPE 0x04
> +#define QPNP_TM_REG_SUBTYPE 0x05
> +#define QPNP_TM_REG_STATUS 0x08
> +#define QPNP_TM_REG_SHUTDOWN_CTRL1 0x40
> +#define QPNP_TM_REG_SHUTDOWN_CTRL2 0x42
> +#define QPNP_TM_REG_ALARM_CTRL 0x46
> +
> +#define QPNP_TM_TYPE 0x09
> +#define QPNP_TM_SUBTYPE 0x08
> +
> +#define STATUS_STAGE_MASK 0x03
> +
> +#define SHUTDOWN_CTRL1_OVERRIDE_STAGE3 0x80
> +#define SHUTDOWN_CTRL1_OVERRIDE_STAGE2 0x40
> +#define SHUTDOWN_CTRL1_THRESHOLD_MASK 0x03
> +
> +#define SHUTDOWN_CTRL2_CLEAR_STAGE3 0x80
> +#define SHUTDOWN_CTRL2_CLEAR_STAGE2 0x40
> +
> +#define ALARM_CTRL_FORCE_ENABLE 0x80
> +#define ALARM_CTRL_FOLLOW_HW_ENABLE 0x01
> +
> +/*
> + * Trip point values based on threshold control
> + * 0 = {105 C, 125 C, 145 C}
> + * 1 = {110 C, 130 C, 150 C}
> + * 2 = {115 C, 135 C, 155 C}
> + * 3 = {120 C, 140 C, 160 C}
> +*/
> +#define TEMP_STAGE_STEP 20000 /* Stage step: 20.000 C */
> +#define TEMP_STAGE_HYSTERESIS 2000
> +
> +#define TEMP_THRESH_MIN 105000 /* Threshold Min: 105 C */
> +#define TEMP_THRESH_STEP 5000 /* Threshold step: 5 C */
> +
> +#define THRESH_MIN 0
> +#define THRESH_MAX 3
> +
> +/* Trip points from most critical to least critical */
> +#define TRIP_STAGE3 0
> +#define TRIP_STAGE2 1
> +#define TRIP_STAGE1 2
> +#define TRIP_NUM 3
> +
> +/* Delay between TEMP_STAT IRQ going high and status value changing
> in ms */
> +#define READ_DELAY_MS 40
> +
> +/* Temperature in Milli Celsius reported during stage 0 if no ADC
> is present */
> +#define DEFAULT_TEMP 37000
> +
> +struct qpnp_tm_chip {
> + struct delayed_workwork;
> + struct regmap*map;
> + struct device*dev;
> + struct thermal_zone_device*tz_dev;
> + enum thermal_device_modemode;
> + long temp;
> + unsigned intthresh;
> + unsigned intstage;
> + unsigned intprev_stage;
> + unsigned intbase;
> + struct iio_channel*adc;
> +};
> +
> +static int qpnp_tm_read(struct qpnp_tm_chip *chip, u16 addr, u8
> *data)
> +{
> + unsigned int val;
> + int ret;
> +
> + ret = regmap_read(chip->map, chip->base + addr, &val);
> + if (ret < 0)
> + return ret;
> +
> + *data = val;
> + return 0;
> +}
> +
> +static int qpnp_tm_write(struct qpnp_tm_chip *chip, u16 addr, u8
> data)
> +{
> + return regmap_write(chip->map, chip->base + addr, data);
> +}
> +
> +static int qpnp_tm_shutdown_override(struct qpnp_tm_chip *chip,
> bool enable)
> +{
> + u8 reg;
> +
> + reg = chip->thresh & SHUTDOWN_CTRL1_THRESHOLD_MASK;
> +
> + if (enable) {
> + reg |= SHUTDOWN_CTRL1_OVERRIDE_STAGE2;
> + reg |= SHUTDOWN_CTRL1_OVERRIDE_STAGE3;
> + }
> +
> + return qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
> +}
> +
> +/*
> + * This function updates the internal temp value based on the
> + * current thermal stage and threshold as well as the previous stage
> + */
> +static int qpnp_tm_update_temp_no_adc(struct qpnp_tm_chip *chip)
> +{
> + unsigned int stage;
> + int ret;
> + u8 reg = 0;
> +
> + ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, ®);
> + if (ret < 0)
> + return ret;
> +
> + stage = reg & STATUS_STAGE_MASK;
> +
> + if (stage > chip->stage) {
> + /* increasing stage, use lower bound */
> + chip->temp = (stage - 1) * TEMP_STAGE_STEP +
> + chip->thresh * TEMP_THRESH_STEP +
> + TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
> + } else if (stage < chip->stage) {
> + /* decreasing stage, use upper bound */
> + chip->temp = stage * TEMP_STAGE_STEP +
> + chip->thresh * TEMP_THRESH_STEP -
> + TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
> + }
> +
> + chip->stage = stage;
> +
> + return 0;
> +}
> +
> +static int qpnp_tz_get_temp(struct thermal_zone_device *thermal,
> + unsigned long *temp)
> +{
> + struct qpnp_tm_chip *chip = thermal->devdata;
> + int ret, mili_celsius;
> +
> + if (!temp)
> + return -EINVAL;
> +
> + if (IS_ERR(chip->adc)) {
> + ret = qpnp_tm_update_temp_no_adc(chip);
> + if (ret < 0)
> + return ret;
> + } else {
> + ret = iio_read_channel_processed(chip->adc, &mili_celsius);
> + if (ret < 0)
> + return ret;
> +
> + chip->temp = mili_celsius;
> + }
> +
> + *temp = chip->temp < 0 ? 0 : chip->temp;
> +
> + return 0;
> +}
> +
> +static int qpnp_tz_get_mode(struct thermal_zone_device *thermal,
> + enum thermal_device_mode *mode)
> +{
> + struct qpnp_tm_chip *chip = thermal->devdata;
> +
> + if (!mode)
> + return -EINVAL;
> +
> + *mode = chip->mode;
> +
> + return 0;
> +}
> +
> +static int qpnp_tz_set_mode(struct thermal_zone_device *thermal,
> + enum thermal_device_mode mode)
> +{
> + struct qpnp_tm_chip *chip = thermal->devdata;
> + int ret;
> +
> + if (mode == chip->mode)
> + return 0;
> +
> + if (mode == THERMAL_DEVICE_ENABLED)
> + ret = qpnp_tm_shutdown_override(chip, true);
> + else
> + ret = qpnp_tm_shutdown_override(chip, false);
> +
> + chip->mode = mode;
> +
> + return ret;
> +}
> +
> +static int qpnp_tz_get_trip_type(struct thermal_zone_device
> *thermal, int trip,
> + enum thermal_trip_type *type)
> +{
> + if (trip < 0 || !type)
> + return -EINVAL;
> +
> + switch (trip) {
> + case TRIP_STAGE3:
> + *type = THERMAL_TRIP_CRITICAL;
> + break;
> + case TRIP_STAGE2:
> + *type = THERMAL_TRIP_HOT;
> + break;
> + case TRIP_STAGE1:
> + *type = THERMAL_TRIP_HOT;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int qpnp_tz_get_trip_temp(struct thermal_zone_device
> *thermal, int trip,
> + unsigned long *temp)
> +{
> + struct qpnp_tm_chip *chip = thermal->devdata;
> + int thresh_temp;
> +
> + if (trip < 0 || !temp)
> + return -EINVAL;
> +
> + thresh_temp = chip->thresh * TEMP_THRESH_STEP +
> TEMP_THRESH_MIN;
> +
> + switch (trip) {
> + case TRIP_STAGE3:
> + thresh_temp += 2 * TEMP_STAGE_STEP;
> + break;
> + case TRIP_STAGE2:
> + thresh_temp += TEMP_STAGE_STEP;
> + break;
> + case TRIP_STAGE1:
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + *temp = thresh_temp;
> +
> + return 0;
> +}
> +
> +static int qpnp_tz_get_crit_temp(struct thermal_zone_device
> *thermal,
> + unsigned long *temp)
> +{
> + struct qpnp_tm_chip *chip = thermal->devdata;
> +
> + if (!temp)
> + return -EINVAL;
> +
> + *temp = chip->thresh * TEMP_THRESH_STEP + TEMP_THRESH_MIN +
> + 2 * TEMP_STAGE_STEP;
> +
> + return 0;
> +}
> +
> +static irqreturn_t qpnp_tm_isr(int irq, void *data)
> +{
> + struct qpnp_tm_chip *chip = data;
> +
> + schedule_delayed_work(&chip->work,
> msecs_to_jiffies(READ_DELAY_MS) + 1);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void qpnp_tm_work(struct work_struct *work)
> +{
> + struct delayed_work *dwork;
> + struct qpnp_tm_chip *chip;
> + int ret, mili_celsius;
> + u8 reg;
> +
> + dwork = container_of(work, struct delayed_work, work);
> + chip = container_of(dwork, struct qpnp_tm_chip, work);
> +
> + if (IS_ERR(chip->adc)) {
> + ret = qpnp_tm_update_temp_no_adc(chip);
> + if (ret < 0)
> + return;
> + } else {
> + ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, ®);
> + if (ret < 0)
> + return;
> +
> + chip->stage = reg & STATUS_STAGE_MASK;
> +
> + ret = iio_read_channel_processed(chip->adc, &mili_celsius);
> + if (ret < 0)
> + return;
> +
> + chip->temp = mili_celsius;
> + }
> +
> + if (chip->stage != chip->prev_stage) {
> + chip->prev_stage = chip->stage;
> +
> + dev_warn(chip->dev, "Thermal alarm stage %u, threshold %u,
> temp %ld mC\n",
> + chip->stage, chip->thresh, chip->temp);
> +
> + thermal_zone_device_update(chip->tz_dev);
> +
> + /* Notify user space */
> + sysfs_notify(&chip->tz_dev->device.kobj, NULL, "type");
> + }
> +}
> +
> +/*
> + * This function initializes the internal temp value based on only
> the
> + * current thermal stage and threshold. Setup threshold control and
> + * disable shutdown override.
> + */
> +static int qpnp_tm_init(struct qpnp_tm_chip *chip)
> +{
> + int ret;
> + u8 reg;
> +
> + chip->thresh = THRESH_MIN;
> + chip->temp = DEFAULT_TEMP;
> +
> + ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, ®);
> + if (ret < 0)
> + return ret;
> +
> + chip->stage = reg & STATUS_STAGE_MASK;
> +
> + if (chip->stage)
> + chip->temp = chip->thresh * TEMP_THRESH_STEP +
> + (chip->stage - 1) * TEMP_STAGE_STEP +
> + TEMP_THRESH_MIN;
> +
> + /*
> + * Set threshold and disable software override of stage 2 and
> 3
> + * shutdowns.
> + */
> + reg = chip->thresh & SHUTDOWN_CTRL1_THRESHOLD_MASK;
> + ret = qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
> + if (ret < 0)
> + return ret;
> +
> + /* Enable the thermal alarm PMIC module in always-on mode. */
> + reg = ALARM_CTRL_FORCE_ENABLE;
> + ret = qpnp_tm_write(chip, QPNP_TM_REG_ALARM_CTRL, reg);
> +
> + return ret;
> +}
> +
> +static struct thermal_zone_device_ops qpnp_tz_ops = {
> + .get_temp= qpnp_tz_get_temp,
> + .get_mode= qpnp_tz_get_mode,
> + .set_mode= qpnp_tz_set_mode,
> + .get_trip_type= qpnp_tz_get_trip_type,
> + .get_trip_temp= qpnp_tz_get_trip_temp,
> + .get_crit_temp= qpnp_tz_get_crit_temp,
> +};
> +
> +static int qpnp_tm_probe(struct platform_device *pdev)
> +{
> + struct qpnp_tm_chip *chip;
> + struct device_node *node;
> + u8 type, subtype;
> + int ret, irq, res[2];
> +
> + node = pdev->dev.of_node;
> +
> + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
> + if (!chip)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&pdev->dev, chip);
> +
> + chip->dev = &pdev->dev;
> + INIT_DELAYED_WORK(&chip->work, qpnp_tm_work);
> +
> + chip->map = dev_get_regmap(chip->dev->parent, NULL);
> + if (!chip->map)
> + return -ENXIO;
> +
> + ret = of_property_read_u32_array(node, "reg", res, 2);
> + if (ret < 0)
> + return ret;
> +
> + chip->base = res[0];
> +
> + ret = qpnp_tm_read(chip, QPNP_TM_REG_TYPE, &type);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "could not read type\n");
> + return ret;
> + }
> +
> + ret = qpnp_tm_read(chip, QPNP_TM_REG_SUBTYPE, &subtype);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "could not read subtype\n");
> + return ret;
> + }
> +
> + if (type != QPNP_TM_TYPE || subtype != QPNP_TM_SUBTYPE) {
> + dev_err(&pdev->dev, "invalid type 0x%02x or subtype
> 0x%02x\n",
> + type, subtype);
> + return -ENODEV;
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + chip->adc = iio_channel_get(chip->dev, "thermal");
> + if (PTR_ERR(chip->adc) == -EPROBE_DEFER)
> + return PTR_ERR(chip->adc);
> +
> + ret = qpnp_tm_init(chip);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "init failed\n");
> + return ret;
> + }
> +
> + /* Start in HW control. Switch to SW control when user
> changes mode. */
> + chip->mode = THERMAL_DEVICE_DISABLED;
> +
> + chip->tz_dev = thermal_zone_device_register(node->name,
> TRIP_NUM, 0,
> + chip, &qpnp_tz_ops, NULL,
> + 0, 0);
> + if (IS_ERR(chip->tz_dev)) {
> + dev_err(&pdev->dev, "TZ registration failed\n");
> + return PTR_ERR(chip->tz_dev);
> + }
> +
> + ret = devm_request_irq(chip->dev, irq, qpnp_tm_isr, 0,
> node->name,
> + chip);
> + if (ret < 0)
> + thermal_zone_device_unregister(chip->tz_dev);
> +
> + return ret;
> +}
> +
> +static int qpnp_tm_remove(struct platform_device *pdev)
> +{
> + struct qpnp_tm_chip *chip = dev_get_drvdata(&pdev->dev);
> +
> + cancel_delayed_work_sync(&chip->work);
> + thermal_zone_device_unregister(chip->tz_dev);
> + qpnp_tm_shutdown_override(chip, false);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int qpnp_tm_suspend(struct device *dev)
> +{
> + struct qpnp_tm_chip *chip = dev_get_drvdata(dev);
> +
> + /* Clear override bits in suspend to allow hardware control
> */
> + qpnp_tm_shutdown_override(chip, false);
> +
> + return 0;
> +}
> +
> +static int qpnp_tm_resume(struct device *dev)
> +{
> + struct qpnp_tm_chip *chip = dev_get_drvdata(dev);
> +
> + /* Override hardware actions so software can control */
> + if (chip->mode == THERMAL_DEVICE_ENABLED)
> + qpnp_tm_shutdown_override(chip, true);
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops qpnp_tm_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(qpnp_tm_suspend, qpnp_tm_resume)
> +};
> +
> +#define QPNP_TM_PM_OPS (&qpnp_tm_pm_ops)
> +#else
> +#define QPNP_TM_PM_OPS NULL
> +#endif
> +
> +static const struct of_device_id qpnp_tm_match_table[] = {
> + { .compatible = "qcom,spmi-temp-alarm" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, qpnp_tm_match_table);
> +
> +static struct platform_driver qpnp_tm_driver = {
> + .driver = {
> + .name = "spmi-temp-alarm",
> + .of_match_table = qpnp_tm_match_table,
> + .pm = QPNP_TM_PM_OPS,
> + },
> + .probe = qpnp_tm_probe,
> + .remove = qpnp_tm_remove,
> +};
> +module_platform_driver(qpnp_tm_driver);
> +
> +MODULE_ALIAS("platform:spmi-temp-alarm");
> +MODULE_DESCRIPTION("QPNP PMIC Temperature Alarm driver");
> +MODULE_LICENSE("GPL v2");
>
--
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