thermal: Add QPNP PMIC temperature alarm driver
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.
Register a thermal sensor. The temperature reported by this thermal
sensor 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.
Cc: David Collins <collinsd@codeaurora.org>
Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
diff --git a/drivers/thermal/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom-spmi-temp-alarm.c
new file mode 100644
index 0000000..c8d27b8
--- /dev/null
+++ b/drivers/thermal/qcom-spmi-temp-alarm.c
@@ -0,0 +1,309 @@
+/*
+ * Copyright (c) 2011-2015, 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/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_ALARM_CTRL 0x46
+
+#define QPNP_TM_TYPE 0x09
+#define QPNP_TM_SUBTYPE 0x08
+
+#define STATUS_STAGE_MASK 0x03
+
+#define SHUTDOWN_CTRL1_THRESHOLD_MASK 0x03
+
+#define ALARM_CTRL_FORCE_ENABLE 0x80
+
+/*
+ * 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
+
+/* 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 thermal_zone_device *tz_dev;
+ long temp;
+ unsigned int thresh;
+ unsigned int stage;
+ unsigned int prev_stage;
+ unsigned int base;
+ 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);
+}
+
+/*
+ * 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_tm_get_temp(void *data, long *temp)
+{
+ struct qpnp_tm_chip *chip = data;
+ 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 const struct thermal_zone_of_device_ops qpnp_tm_sensor_ops = {
+ .get_temp = qpnp_tm_get_temp,
+};
+
+static irqreturn_t qpnp_tm_isr(int irq, void *data)
+{
+ struct qpnp_tm_chip *chip = data;
+
+ thermal_zone_device_update(chip->tz_dev);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * 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 int qpnp_tm_probe(struct platform_device *pdev)
+{
+ struct qpnp_tm_chip *chip;
+ struct device_node *node;
+ u8 type, subtype;
+ u32 res[2];
+ 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->map = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!chip->map)
+ return -ENXIO;
+
+ ret = of_property_read_u32_array(node, "reg", res, 2);
+ if (ret < 0)
+ return ret;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ /* ADC based measurements are optional */
+ chip->adc = iio_channel_get(&pdev->dev, "thermal");
+ if (PTR_ERR(chip->adc) == -EPROBE_DEFER)
+ return PTR_ERR(chip->adc);
+
+ 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");
+ goto fail;
+ }
+
+ ret = qpnp_tm_read(chip, QPNP_TM_REG_SUBTYPE, &subtype);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "could not read subtype\n");
+ goto fail;
+ }
+
+ if (type != QPNP_TM_TYPE || subtype != QPNP_TM_SUBTYPE) {
+ dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
+ type, subtype);
+ ret = -ENODEV;
+ goto fail;
+ }
+
+ ret = qpnp_tm_init(chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "init failed\n");
+ goto fail;
+ }
+
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, qpnp_tm_isr,
+ IRQF_ONESHOT, node->name, chip);
+ if (ret < 0)
+ goto fail;
+
+ chip->tz_dev = 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");
+ ret = PTR_ERR(chip->tz_dev);
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ if (!IS_ERR(chip->adc))
+ iio_channel_release(chip->adc);
+
+ return ret;
+}
+
+static int qpnp_tm_remove(struct platform_device *pdev)
+{
+ struct qpnp_tm_chip *chip = dev_get_drvdata(&pdev->dev);
+
+ thermal_zone_of_sensor_unregister(&pdev->dev, chip->tz_dev);
+ if (!IS_ERR(chip->adc))
+ iio_channel_release(chip->adc);
+
+ 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,
+ .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");