1 files changed, 465 insertions, 0 deletions

diff --git a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
new file mode 100644
index 000000000000..c1fd71dbab3e
--- /dev/null
+++ b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
@@ -0,0 +1,465 @@
+/*
+ * Copyright (c) 2011-2015, 2017, 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/bitops.h>
+#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>
+
+#include "../thermal_core.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_ALARM_CTRL          0x46
+
+#define QPNP_TM_TYPE                    0x09
+#define QPNP_TM_SUBTYPE_GEN1            0x08
+#define QPNP_TM_SUBTYPE_GEN2            0x09
+
+#define STATUS_GEN1_STAGE_MASK          GENMASK(1, 0)
+#define STATUS_GEN2_STATE_MASK          GENMASK(6, 4)
+#define STATUS_GEN2_STATE_SHIFT         4
+
+#define SHUTDOWN_CTRL1_OVERRIDE_S2      BIT(6)
+#define SHUTDOWN_CTRL1_THRESHOLD_MASK   GENMASK(1, 0)
+
+#define SHUTDOWN_CTRL1_RATE_25HZ        BIT(3)
+
+#define ALARM_CTRL_FORCE_ENABLE         BIT(7)
+
+/*
+ * 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
+
+/* Stage 2 Threshold Min: 125 C */
+#define STAGE2_THRESHOLD_MIN            125000
+/* Stage 2 Threshold Max: 140 C */
+#define STAGE2_THRESHOLD_MAX            140000
+
+/* Temperature in Milli Celsius reported during stage 0 if no ADC is present */
+#define DEFAULT_TEMP                    37000
+
+struct qpnp_tm_chip {
+        struct regmap                   *map;
+        struct device                   *dev;
+        struct thermal_zone_device      *tz_dev;
+        unsigned int                    subtype;
+        long                            temp;
+        unsigned int                    thresh;
+        unsigned int                    stage;
+        unsigned int                    prev_stage;
+        unsigned int                    base;
+        /* protects .thresh, .stage and chip registers */
+        struct mutex                    lock;
+        bool                            initialized;
+
+        struct iio_channel              *adc;
+};
+
+/* This array maps from GEN2 alarm state to GEN1 alarm stage */
+static const unsigned int alarm_state_map[8] = {0, 1, 1, 2, 2, 3, 3, 3};
+
+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);
+}
+
+/**
+ * qpnp_tm_get_temp_stage() - return over-temperature stage
+ * @chip:               Pointer to the qpnp_tm chip
+ *
+ * Return: stage (GEN1) or state (GEN2) on success, or errno on failure.
+ */
+static int qpnp_tm_get_temp_stage(struct qpnp_tm_chip *chip)
+{
+        int ret;
+        u8 reg = 0;
+
+        ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, &reg);
+        if (ret < 0)
+                return ret;
+
+        if (chip->subtype == QPNP_TM_SUBTYPE_GEN1)
+                ret = reg & STATUS_GEN1_STAGE_MASK;
+        else
+                ret = (reg & STATUS_GEN2_STATE_MASK) >> STATUS_GEN2_STATE_SHIFT;
+
+        return ret;
+}
+
+/*
+ * 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, stage_new, stage_old;
+        int ret;
+
+        WARN_ON(!mutex_is_locked(&chip->lock));
+
+        ret = qpnp_tm_get_temp_stage(chip);
+        if (ret < 0)
+                return ret;
+        stage = ret;
+
+        if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) {
+                stage_new = stage;
+                stage_old = chip->stage;
+        } else {
+                stage_new = alarm_state_map[stage];
+                stage_old = alarm_state_map[chip->stage];
+        }
+
+        if (stage_new > stage_old) {
+                /* increasing stage, use lower bound */
+                chip->temp = (stage_new - 1) * TEMP_STAGE_STEP +
+                             chip->thresh * TEMP_THRESH_STEP +
+                             TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
+        } else if (stage_new < stage_old) {
+                /* decreasing stage, use upper bound */
+                chip->temp = stage_new * TEMP_STAGE_STEP +
+                             chip->thresh * TEMP_THRESH_STEP -
+                             TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
+        }
+
+        chip->stage = stage;
+
+        return 0;
+}
+
+static int qpnp_tm_get_temp(void *data, int *temp)
+{
+        struct qpnp_tm_chip *chip = data;
+        int ret, mili_celsius;
+
+        if (!temp)
+                return -EINVAL;
+
+        if (!chip->initialized) {
+                *temp = DEFAULT_TEMP;
+                return 0;
+        }
+
+        if (!chip->adc) {
+                mutex_lock(&chip->lock);
+                ret = qpnp_tm_update_temp_no_adc(chip);
+                mutex_unlock(&chip->lock);
+                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_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
+                                             int temp)
+{
+        u8 reg;
+        bool disable_s2_shutdown = false;
+
+        WARN_ON(!mutex_is_locked(&chip->lock));
+
+        /*
+         * Default: S2 and S3 shutdown enabled, thresholds at
+         * 105C/125C/145C, monitoring at 25Hz
+         */
+        reg = SHUTDOWN_CTRL1_RATE_25HZ;
+
+        if (temp == THERMAL_TEMP_INVALID ||
+            temp < STAGE2_THRESHOLD_MIN) {
+                chip->thresh = THRESH_MIN;
+                goto skip;
+        }
+
+        if (temp <= STAGE2_THRESHOLD_MAX) {
+                chip->thresh = THRESH_MAX -
+                        ((STAGE2_THRESHOLD_MAX - temp) /
+                         TEMP_THRESH_STEP);
+                disable_s2_shutdown = true;
+        } else {
+                chip->thresh = THRESH_MAX;
+
+                if (chip->adc)
+                        disable_s2_shutdown = true;
+                else
+                        dev_warn(chip->dev,
+                                 "No ADC is configured and critical temperature is above the maximum stage 2 threshold of 140 C! Configuring stage 2 shutdown at 140 C.\n");
+        }
+
+skip:
+        reg |= chip->thresh;
+        if (disable_s2_shutdown)
+                reg |= SHUTDOWN_CTRL1_OVERRIDE_S2;
+
+        return qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
+}
+
+static int qpnp_tm_set_trip_temp(void *data, int trip, int temp)
+{
+        struct qpnp_tm_chip *chip = data;
+        const struct thermal_trip *trip_points;
+        int ret;
+
+        trip_points = of_thermal_get_trip_points(chip->tz_dev);
+        if (!trip_points)
+                return -EINVAL;
+
+        if (trip_points[trip].type != THERMAL_TRIP_CRITICAL)
+                return 0;
+
+        mutex_lock(&chip->lock);
+        ret = qpnp_tm_update_critical_trip_temp(chip, temp);
+        mutex_unlock(&chip->lock);
+
+        return ret;
+}
+
+static const struct thermal_zone_of_device_ops qpnp_tm_sensor_ops = {
+        .get_temp = qpnp_tm_get_temp,
+        .set_trip_temp = qpnp_tm_set_trip_temp,
+};
+
+static irqreturn_t qpnp_tm_isr(int irq, void *data)
+{
+        struct qpnp_tm_chip *chip = data;
+
+        thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);
+
+        return IRQ_HANDLED;
+}
+
+static int qpnp_tm_get_critical_trip_temp(struct qpnp_tm_chip *chip)
+{
+        int ntrips;
+        const struct thermal_trip *trips;
+        int i;
+
+        ntrips = of_thermal_get_ntrips(chip->tz_dev);
+        if (ntrips <= 0)
+                return THERMAL_TEMP_INVALID;
+
+        trips = of_thermal_get_trip_points(chip->tz_dev);
+        if (!trips)
+                return THERMAL_TEMP_INVALID;
+
+        for (i = 0; i < ntrips; i++) {
+                if (of_thermal_is_trip_valid(chip->tz_dev, i) &&
+                    trips[i].type == THERMAL_TRIP_CRITICAL)
+                        return trips[i].temperature;
+        }
+
+        return THERMAL_TEMP_INVALID;
+}
+
+/*
+ * 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)
+{
+        unsigned int stage;
+        int ret;
+        u8 reg = 0;
+        int crit_temp;
+
+        mutex_lock(&chip->lock);
+
+        ret = qpnp_tm_read(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, &reg);
+        if (ret < 0)
+                goto out;
+
+        chip->thresh = reg & SHUTDOWN_CTRL1_THRESHOLD_MASK;
+        chip->temp = DEFAULT_TEMP;
+
+        ret = qpnp_tm_get_temp_stage(chip);
+        if (ret < 0)
+                goto out;
+        chip->stage = ret;
+
+        stage = chip->subtype == QPNP_TM_SUBTYPE_GEN1
+                ? chip->stage : alarm_state_map[chip->stage];
+
+        if (stage)
+                chip->temp = chip->thresh * TEMP_THRESH_STEP +
+                             (stage - 1) * TEMP_STAGE_STEP +
+                             TEMP_THRESH_MIN;
+
+        crit_temp = qpnp_tm_get_critical_trip_temp(chip);
+        ret = qpnp_tm_update_critical_trip_temp(chip, crit_temp);
+        if (ret < 0)
+                goto out;
+
+        /* 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);
+
+        chip->initialized = true;
+
+out:
+        mutex_unlock(&chip->lock);
+        return ret;
+}
+
+static int qpnp_tm_probe(struct platform_device *pdev)
+{
+        struct qpnp_tm_chip *chip;
+        struct device_node *node;
+        u8 type, subtype;
+        u32 res;
+        int ret, irq;
+
+        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;
+
+        mutex_init(&chip->lock);
+
+        chip->map = dev_get_regmap(pdev->dev.parent, NULL);
+        if (!chip->map)
+                return -ENXIO;
+
+        ret = of_property_read_u32(node, "reg", &res);
+        if (ret < 0)
+                return ret;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0)
+                return irq;
+
+        /* ADC based measurements are optional */
+        chip->adc = devm_iio_channel_get(&pdev->dev, "thermal");
+        if (IS_ERR(chip->adc)) {
+                ret = PTR_ERR(chip->adc);
+                chip->adc = NULL;
+                if (ret == -EPROBE_DEFER)
+                        return ret;
+        }
+
+        chip->base = res;
+
+        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_GEN1
+                                     && subtype != QPNP_TM_SUBTYPE_GEN2)) {
+                dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
+                        type, subtype);
+                return -ENODEV;
+        }
+
+        chip->subtype = subtype;
+
+        /*
+         * Register the sensor before initializing the hardware to be able to
+         * read the trip points. get_temp() returns the default temperature
+         * before the hardware initialization is completed.
+         */
+        chip->tz_dev = devm_thermal_zone_of_sensor_register(
+                &pdev->dev, 0, chip, &qpnp_tm_sensor_ops);
+        if (IS_ERR(chip->tz_dev)) {
+                dev_err(&pdev->dev, "failed to register sensor\n");
+                return PTR_ERR(chip->tz_dev);
+        }
+
+        ret = qpnp_tm_init(chip);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "init failed\n");
+                return ret;
+        }
+
+        ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, qpnp_tm_isr,
+                                        IRQF_ONESHOT, node->name, chip);
+        if (ret < 0)
+                return ret;
+
+        thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);
+
+        return 0;
+}
+
+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,
+        },
+        .probe  = qpnp_tm_probe,
+};
+module_platform_driver(qpnp_tm_driver);
+
+MODULE_ALIAS("platform:spmi-temp-alarm");
+MODULE_DESCRIPTION("QPNP PMIC Temperature Alarm driver");
+MODULE_LICENSE("GPL v2");