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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2011-2015, 2017, 2020, The Linux Foundation. All rights reserved.
- */
- #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, ®);
- 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;
- 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, ®);
- 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");
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