--- /dev/null
+/*
+ * 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");
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff