TSENS supports reading temperature from multiple thermal
sensors present in QCOM SOCs.
TSENS HW is enabled only when the main sensor is requested.
The TSENS block is disabled if the main senors is disabled
irrespective of any other sensors that are being enabled.
TSENS driver supports configurable threshold for temperature
monitoring in which case it can generate an interrupt when specific
thresholds are reached
Based on code by Siddartha Mohanadoss and Stephen Boyd.
Cc: Siddartha Mohanadoss <smohanad@xxxxxxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Signed-off-by: Narendran Rajan <nrajan@xxxxxxxxxxxxxx>
---
drivers/thermal/Kconfig | 14 +
drivers/thermal/Makefile | 1 +
drivers/thermal/msm8960_tsens.c | 841 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 856 insertions(+)
create mode 100644 drivers/thermal/msm8960_tsens.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 20915ca..a4cb2c0 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -261,6 +261,20 @@ config INTEL_SOC_DTS_THERMAL
notification methods.The other trip is a critical trip point, which
was set by the driver based on the TJ MAX temperature.
+config THERMAL_TSENS8960
+ tristate "Qualcomm 8960 Tsens Temperature driver"
+ depends on THERMAL
+ depends on ARCH_QCOM
+ help
+ QCOM tsens thermal driver provides support for Temperature sensor
+ (TSENS) found on QCOM SoCs. It supports four configurable trip points
+ and controls multiple sensors on the SOC. The four trip points are
+ common across all sensors present in the SoC. The number of sensors
+ present vary from chip to chip and are set through device tree entry.
+ The driver presents as a standard thermal zone device with configurable
+ trip points and cooling device mapping through standard thermal zone
+ device tree
+
menu "ACPI INT340X thermal drivers"
source drivers/thermal/int340x_thermal/Kconfig
endmenu
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index fa0dc48..23c7a34 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -39,3 +39,4 @@ obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/
obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/
obj-$(CONFIG_ST_THERMAL) += st/
obj-$(CONFIG_TEGRA_SOCTHERM) += tegra_soctherm.o
+obj-$(CONFIG_THERMAL_TSENS8960) += msm8960_tsens.o
diff --git a/drivers/thermal/msm8960_tsens.c b/drivers/thermal/msm8960_tsens.c
new file mode 100644
index 0000000..307bdc8
--- /dev/null
+++ b/drivers/thermal/msm8960_tsens.c
@@ -0,0 +1,841 @@
+/* Copyright (c) 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/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+
+/* Trips: from very hot to very cold */
+enum tsens_trip_type {
+ TSENS_TRIP_STAGE3,
+ TSENS_TRIP_STAGE2,
+ TSENS_TRIP_STAGE1,
+ TSENS_TRIP_STAGE0,
+ TSENS_TRIP_NUM,
+};
+
+#define TSENS_CAL_MDEGC 30000
+
+#define TSENS_MAX_SENSORS 11
+
+#define TSENS_8960_CONFIG_ADDR 0x3640
+#define TSENS_8960_CONFIG 0x9b
+#define TSENS_8960_CONFIG_MASK 0xf
+
+#define TSENS_CNTL_ADDR 0x3620
+#define TSENS_CNTL_RESUME_MASK 0xfffffff9
+#define TSENS_EN BIT(0)
+#define TSENS_SW_RST BIT(1)
+#define SENSOR0_EN BIT(3)
+#define TSENS_MIN_STATUS_MASK BIT(0)
+#define TSENS_LOWER_STATUS_CLR BIT(1)
+#define TSENS_UPPER_STATUS_CLR BIT(2)
+#define TSENS_MAX_STATUS_MASK BIT(3)
+#define TSENS_MEASURE_PERIOD 1
+#define TSENS_8960_SLP_CLK_ENA BIT(26)
+#define TSENS_8660_SLP_CLK_ENA BIT(24)
+#define TSENS_8064_STATUS_CNTL 0x3660
+
+#define TSENS_THRESHOLD_ADDR 0x3624
+#define TSENS_THRESHOLD_MAX_CODE 0xff
+#define TSENS_THRESHOLD_MIN_CODE 0
+#define TSENS_THRESHOLD_MAX_LIMIT_SHIFT 24
+#define TSENS_THRESHOLD_MIN_LIMIT_SHIFT 16
+#define TSENS_THRESHOLD_UPPER_LIMIT_SHIFT 8
+#define TSENS_THRESHOLD_LOWER_LIMIT_SHIFT 0
+
+/* Initial temperature threshold values */
+#define TSENS_LOWER_LIMIT_TH 0x50
+#define TSENS_UPPER_LIMIT_TH 0xdf
+#define TSENS_MIN_LIMIT_TH 0x0
+#define TSENS_MAX_LIMIT_TH 0xff
+
+#define TSENS_S0_STATUS_ADDR 0x3628
+
+#define TSENS_INT_STATUS_ADDR 0x363c
+#define TSENS_LOWER_INT_MASK BIT(1)
+#define TSENS_UPPER_INT_MASK BIT(2)
+#define TSENS_MAX_INT_MASK BIT(3)
+#define TSENS_TRDY_MASK BIT(7)
+
+#define TSENS_SENSOR_SHIFT 16
+#define TSENS_REDUND_SHIFT 24
+#define TSENS_SENSOR0_SHIFT 3
+
+#define TSENS_8660_QFPROM_ADDR 0x00bc
+#define TSENS_8660_CONFIG 1
+#define TSENS_8660_CONFIG_SHIFT 28
+#define TSENS_8660_CONFIG_MASK (3 << TSENS_8660_CONFIG_SHIFT)
+
+struct tsens_device;
+
+struct tsens_sensor {
+ struct thermal_zone_device *tz_dev;
+ enum thermal_device_mode mode;
+ unsigned int sensor_num;
+ int offset;
+ u32 slope;
+ struct tsens_device *tmdev;
+ u32 status;
+};
+
+struct tsens_device {
+ bool prev_reading_avail;
+ unsigned int num_sensors;
+ int pm_tsens_thr_data;
+ int pm_tsens_cntl;
+ unsigned int calib_offset;
+ unsigned int backup_calib_offset;
+ struct work_struct tsens_work;
+ struct regmap *map;
+ struct regmap_field *status_field;
+ struct tsens_sensor sensor[0];
+};
+
+static struct device *tsens_dev;
+
+/* Temperature on y axis and ADC-code on x-axis */
+static int
+tsens_tz_code_to_mdegC(u32 adc_code, const struct tsens_sensor *s)
+{
+ return adc_code * s->slope + s->offset;
+}
+
+static int tsens_tz_get_temp(void *_sensor,
+ long *temp)
+{
+ const struct tsens_sensor *tm_sensor = _sensor;
+ struct tsens_device *tmdev = tm_sensor->tmdev;
+ u32 code, trdy;
+
+ if (tm_sensor->mode != THERMAL_DEVICE_ENABLED)
+ return -EINVAL;
+
+ if (!tmdev->prev_reading_avail) {
+ while (!regmap_read(tmdev->map, TSENS_INT_STATUS_ADDR, &trdy) &&
+ !(trdy & TSENS_TRDY_MASK))
+ usleep_range(1000, 1100);
+ tmdev->prev_reading_avail = true;
+ }
+
+ regmap_read(tmdev->map, tm_sensor->status, &code);
+ *temp = tsens_tz_code_to_mdegC(code, tm_sensor);
+
+ dev_dbg(tsens_dev, "Temperature for sensor %d is: %ld",
+ tm_sensor->sensor_num, *temp);
+
+ return 0;
+}
+
+/*
+ * If the main sensor is disabled all the sensors are disable and
+ * the clock is disabled.
+ * If the main sensor is disabled and a sub-sensor is enabled
+ * return with an error.
+ */
+static int tsens_tz_set_mode(struct tsens_sensor *tm_sensor,
+ enum thermal_device_mode mode)
+{
+ struct tsens_device *tmdev = tm_sensor->tmdev;
+ unsigned int i, n = tmdev->num_sensors;
+ u32 reg, mask;
+
+ if (mode == tm_sensor->mode)
+ return 0;
+
+ regmap_read(tmdev->map, TSENS_CNTL_ADDR, ®);
+
+ mask = BIT(tm_sensor->sensor_num + TSENS_SENSOR0_SHIFT);
+ if (mode == THERMAL_DEVICE_ENABLED) {
+ if (!(reg & SENSOR0_EN) && mask != SENSOR0_EN) {
+ pr_err("Main sensor not enabled\n");
+ return -EINVAL;
+ }
+
+ regmap_write(tmdev->map, TSENS_CNTL_ADDR, reg | TSENS_SW_RST);
+ if (tmdev->num_sensors > 1)
+ reg |= mask | TSENS_8960_SLP_CLK_ENA | TSENS_EN;
+ else
+ reg |= mask | TSENS_8660_SLP_CLK_ENA | TSENS_EN;
+ tmdev->prev_reading_avail = false;
+ } else {
+ reg &= ~mask;
+ if (!(reg & SENSOR0_EN)) {
+ dev_warn(tsens_dev, "Main sensor not enabled. Disabling subsensors\n");
+
+ reg &= ~GENMASK(n + TSENS_SENSOR0_SHIFT - 1,
+ TSENS_SENSOR0_SHIFT);
+ reg &= ~TSENS_EN;
+
+ if (tmdev->num_sensors > 1)
+ reg &= ~TSENS_8960_SLP_CLK_ENA;
+ else
+ reg &= ~TSENS_8660_SLP_CLK_ENA;
+
+ /* Disable all sub-sensors */
+ for (i = 1; i < n; i++)
+ tmdev->sensor[i].mode = mode;
+ }
+ }
+
+ regmap_write(tmdev->map, TSENS_CNTL_ADDR, reg);
+ tm_sensor->mode = mode;
+
+ return 0;
+}
+
+#ifdef THERMAL_TSENS8960_HWTRIPS
+static int tsens_get_trip_temp(struct tsens_sensor *tm_sensor,
+ int trip, int *temp)
+{
+ struct tsens_device *tmdev = tm_sensor->tmdev;
+ u32 reg;
+
+ regmap_read(tmdev->map, TSENS_THRESHOLD_ADDR, ®);
+ switch (trip) {
+ case TSENS_TRIP_STAGE3:
+ reg >>= TSENS_THRESHOLD_MAX_LIMIT_SHIFT;
+ break;
+ case TSENS_TRIP_STAGE2:
+ reg >>= TSENS_THRESHOLD_UPPER_LIMIT_SHIFT;
+ break;
+ case TSENS_TRIP_STAGE1:
+ reg >>= TSENS_THRESHOLD_LOWER_LIMIT_SHIFT;
+ break;
+ case TSENS_TRIP_STAGE0:
+ reg >>= TSENS_THRESHOLD_MIN_LIMIT_SHIFT;
+ break;
+ default:
+ return -EINVAL;
+ }
+ reg &= TSENS_THRESHOLD_MAX_CODE;
+
+ temp = tsens_tz_code_to_mdegC(reg, tm_sensor);
+
+ dev_dbg(tsens_dev, "Sensor %d, trip %d temp is :%d",
+ tm_sensor->sensor_num, trip, *temp);
+
+ return 0;
+}
+
+static void tsens_print_trip_temp(struct tsens_sensor *tm_sensor)
+{
+ int temp;
+
+ tsens_get_trip_temp(tm_sensor, TSENS_TRIP_STAGE0, &temp);
+ tsens_get_trip_temp(tm_sensor, TSENS_TRIP_STAGE1, &temp);
+ tsens_get_trip_temp(tm_sensor, TSENS_TRIP_STAGE2, &temp);
+ tsens_get_trip_temp(tm_sensor, TSENS_TRIP_STAGE3, &temp);
+}
+
+static int tsens_tz_mdegC_to_code(int mdegC, const struct tsens_sensor *s)
+{
+ int code;
+
+ code = DIV_ROUND_CLOSEST(mdegC - s->offset, s->slope);
+ return clamp(code, TSENS_THRESHOLD_MIN_CODE, TSENS_THRESHOLD_MAX_CODE);
+}
+
+static u32 tsens_hi_code(int trip, u32 reg_cntl, u32 thresh)
+{
+ u32 hi_code;
+
+ switch (trip) {
+ case TSENS_TRIP_STAGE0:
+ if (!(reg_cntl & TSENS_LOWER_STATUS_CLR)) {
+ hi_code = thresh >> TSENS_THRESHOLD_LOWER_LIMIT_SHIFT;
+ break;
+ }
+ /* else fall through */
+ case TSENS_TRIP_STAGE1:
+ if (!(reg_cntl & TSENS_UPPER_STATUS_CLR)) {
+ hi_code = thresh >> TSENS_THRESHOLD_UPPER_LIMIT_SHIFT;
+ break;
+ }
+ /* else fall through */
+ case TSENS_TRIP_STAGE2:
+ if (!(reg_cntl & TSENS_MAX_STATUS_MASK)) {
+ hi_code = thresh >> TSENS_THRESHOLD_MAX_LIMIT_SHIFT;
+ break;
+ }
+ /* else fall through */
+ case TSENS_TRIP_STAGE3:
+ default:
+ hi_code = TSENS_THRESHOLD_MAX_CODE;
+ break;
+ }
+
+ return hi_code & TSENS_THRESHOLD_MAX_CODE;
+}
+
+static u32 tsens_lo_code(int trip, u32 reg_cntl, u32 thresh)
+{
+ u32 lo_code;
+
+ switch (trip) {
+ case TSENS_TRIP_STAGE3:
+ if (!(reg_cntl & TSENS_UPPER_STATUS_CLR)) {
+ lo_code = thresh >> TSENS_THRESHOLD_UPPER_LIMIT_SHIFT;
+ break;
+ }
+ /* else fall through */
+ case TSENS_TRIP_STAGE2:
+ if (!(reg_cntl & TSENS_LOWER_STATUS_CLR)) {
+ lo_code = thresh >> TSENS_THRESHOLD_LOWER_LIMIT_SHIFT;
+ break;
+ }
+ /* else fall through */
+ case TSENS_TRIP_STAGE1:
+ if (!(reg_cntl & TSENS_MIN_STATUS_MASK)) {
+ lo_code = thresh >> TSENS_THRESHOLD_MIN_LIMIT_SHIFT;
+ break;
+ }
+ /* else fall through */
+ case TSENS_TRIP_STAGE0:
+ default:
+ lo_code = TSENS_THRESHOLD_MIN_CODE;
+ break;
+ }
+
+ return lo_code & TSENS_THRESHOLD_MAX_CODE;
+}
+
+static int tsens_tz_set_trip_temp(struct tsens_sensor *tm_sensor,
+ int trip, unsigned long temp)
+{
+ struct tsens_device *tmdev = tm_sensor->tmdev;
+ struct regmap_field *status = tmdev->status_field;
+ u32 thresh, reg_cntl, mask = TSENS_THRESHOLD_MAX_CODE;
+ u32 code, hi_code, lo_code, code_err_chk;
+
+ code_err_chk = code = tsens_tz_mdegC_to_code(temp, tm_sensor);
+
+ regmap_field_read(status, ®_cntl);
+ regmap_read(tmdev->map, TSENS_THRESHOLD_ADDR, &thresh);
+
+ switch (trip) {
+ case TSENS_TRIP_STAGE3:
+ code <<= TSENS_THRESHOLD_MAX_LIMIT_SHIFT;
+ mask <<= TSENS_THRESHOLD_MAX_LIMIT_SHIFT;
+ break;
+ case TSENS_TRIP_STAGE2:
+ code <<= TSENS_THRESHOLD_UPPER_LIMIT_SHIFT;
+ mask <<= TSENS_THRESHOLD_UPPER_LIMIT_SHIFT;
+ break;
+ case TSENS_TRIP_STAGE1:
+ code <<= TSENS_THRESHOLD_LOWER_LIMIT_SHIFT;
+ mask <<= TSENS_THRESHOLD_LOWER_LIMIT_SHIFT;
+ break;
+ case TSENS_TRIP_STAGE0:
+ code <<= TSENS_THRESHOLD_MIN_LIMIT_SHIFT;
+ mask <<= TSENS_THRESHOLD_MIN_LIMIT_SHIFT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ hi_code = tsens_hi_code(trip, reg_cntl, thresh);
+ lo_code = tsens_lo_code(trip, reg_cntl, thresh);
+
+ if (code_err_chk < lo_code || code_err_chk > hi_code)
+ return -EINVAL;
+
+ regmap_update_bits(tmdev->map, TSENS_THRESHOLD_ADDR, mask, code);
+
+ return 0;
+}
+
+static int tsens_set_trips(void *_sensor, long low, long high)
+{
+ struct tsens_sensor *tm_sensor = _sensor;
+
+ tsens_print_trip_temp(tm_sensor);
+
+ if (tsens_tz_set_trip_temp(tm_sensor, TSENS_TRIP_STAGE2, high))
+ return -EINVAL;
+
+ if (tsens_tz_set_trip_temp(tm_sensor, TSENS_TRIP_STAGE1, low))
+ return -EINVAL;
+
+ return 0;
+}
+#endif
+
+static void tsens_scheduler_fn(struct work_struct *work)
+{
+ struct tsens_device *tmdev;
+ struct regmap_field *status;
+ unsigned int threshold, threshold_low, i, code, bits, mask = 0;
+ unsigned long sensor;
+ bool upper_th_x, lower_th_x;
+
+ tmdev = container_of(work, struct tsens_device, tsens_work);
+ status = tmdev->status_field;
+
+ regmap_field_update_bits(status,
+ TSENS_LOWER_STATUS_CLR | TSENS_UPPER_STATUS_CLR,
+ TSENS_LOWER_STATUS_CLR | TSENS_UPPER_STATUS_CLR);
+
+ regmap_read(tmdev->map, TSENS_THRESHOLD_ADDR, &threshold);
+ threshold_low = threshold >> TSENS_THRESHOLD_LOWER_LIMIT_SHIFT;
+ threshold_low &= TSENS_THRESHOLD_MAX_CODE;
+ threshold = threshold >> TSENS_THRESHOLD_UPPER_LIMIT_SHIFT;
+ threshold &= TSENS_THRESHOLD_MAX_CODE;
+
+ regmap_read(tmdev->map, TSENS_CNTL_ADDR, &bits);
+ sensor = bits;
+ sensor >>= TSENS_SENSOR0_SHIFT;
+ for_each_set_bit(i, &sensor, tmdev->num_sensors) {
+ regmap_read(tmdev->map, tmdev->sensor[i].status, &code);
+ upper_th_x = code >= threshold;
+ lower_th_x = code <= threshold_low;
+
+ if (upper_th_x)
+ mask |= TSENS_UPPER_STATUS_CLR;
+
+ if (lower_th_x)
+ mask |= TSENS_LOWER_STATUS_CLR;
+
+#ifdef THERMAL_TSENS8960_HWTRIPS
+ if (upper_th_x || lower_th_x) {
+ dev_info(tsens_dev,
+ "Threshold reached for sensor(%d)\n", i);
+ thermal_zone_device_update(tmdev->sensor[i].tz_dev);
+ }
+#endif
+ }
+
+ regmap_field_update_bits(status,
+ TSENS_UPPER_STATUS_CLR | TSENS_LOWER_STATUS_CLR, mask);
+}
+
+static irqreturn_t tsens_isr(int irq, void *data)
+{
+ schedule_work(data);
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PM
+static int tsens_suspend(struct device *dev)
+{
+ int i;
+ struct tsens_device *tmdev = dev_get_drvdata(dev);
+ struct regmap *map = tmdev->map;
+
+ regmap_read(map, TSENS_THRESHOLD_ADDR, &tmdev->pm_tsens_thr_data);
+ regmap_read(map, TSENS_CNTL_ADDR, &tmdev->pm_tsens_cntl);
+ regmap_update_bits(map, TSENS_CNTL_ADDR,
+ TSENS_8960_SLP_CLK_ENA | TSENS_EN, 0);
+
+ tmdev->prev_reading_avail = 0;
+ for (i = 0; i < tmdev->num_sensors; i++)
+ tmdev->sensor[i].mode = THERMAL_DEVICE_DISABLED;
+
+ return 0;
+}
+
+static int tsens_resume(struct device *dev)
+{
+ int i;
+ unsigned long reg_cntl;
+ struct tsens_device *tmdev = dev_get_drvdata(dev);
+ struct regmap *map = tmdev->map;
+
+ regmap_update_bits(map, TSENS_CNTL_ADDR, TSENS_SW_RST, TSENS_SW_RST);
+ regmap_field_update_bits(tmdev->status_field,
+ TSENS_MIN_STATUS_MASK | TSENS_MAX_STATUS_MASK,
+ TSENS_MIN_STATUS_MASK | TSENS_MAX_STATUS_MASK);
+
+ if (tmdev->num_sensors > 1)
+ regmap_update_bits(map, TSENS_8960_CONFIG_ADDR,
+ TSENS_8960_CONFIG_MASK,
+ TSENS_8960_CONFIG);
+
+ regmap_write(map, TSENS_THRESHOLD_ADDR, tmdev->pm_tsens_thr_data);
+ regmap_write(map, TSENS_CNTL_ADDR, tmdev->pm_tsens_cntl);
+
+ reg_cntl = tmdev->pm_tsens_cntl;
+ reg_cntl >>= TSENS_SENSOR0_SHIFT;
+ for_each_set_bit(i, ®_cntl, tmdev->num_sensors)
+ tmdev->sensor[i].mode = THERMAL_DEVICE_ENABLED;
+
+ return 0;
+}
+
+static const struct dev_pm_ops tsens_pm_ops = {
+ .suspend = tsens_suspend,
+ .resume = tsens_resume,
+};
+#endif
+
+static void tsens_disable_mode(const struct tsens_device *tmdev)
+{
+ u32 reg_cntl;
+ u32 mask;
+
+ mask = GENMASK(tmdev->num_sensors - 1, 0);
+ mask <<= TSENS_SENSOR0_SHIFT;
+ mask |= TSENS_EN;
+
+ regmap_read(tmdev->map, TSENS_CNTL_ADDR, ®_cntl);
+ reg_cntl &= ~mask;
+ if (tmdev->num_sensors > 1)
+ reg_cntl &= ~TSENS_8960_SLP_CLK_ENA;
+ else
+ reg_cntl &= ~TSENS_8660_SLP_CLK_ENA;
+ regmap_write(tmdev->map, TSENS_CNTL_ADDR, reg_cntl);
+}
+
+static void tsens_hw_init(struct tsens_device *tmdev)
+{
+ u32 reg_cntl, reg_thr;
+
+ reg_cntl = TSENS_SW_RST;
+ regmap_update_bits(tmdev->map, TSENS_CNTL_ADDR, TSENS_SW_RST, reg_cntl);
+
+ if (tmdev->num_sensors > 1) {
+ reg_cntl |= TSENS_8960_SLP_CLK_ENA |
+ (TSENS_MEASURE_PERIOD << 18);
+ reg_cntl &= ~TSENS_SW_RST;
+ regmap_update_bits(tmdev->map, TSENS_8960_CONFIG_ADDR,
+ TSENS_8960_CONFIG_MASK, TSENS_8960_CONFIG);
+ } else {
+ reg_cntl |= TSENS_8660_SLP_CLK_ENA |
+ (TSENS_MEASURE_PERIOD << 16);
+ reg_cntl &= ~TSENS_8660_CONFIG_MASK;
+ reg_cntl |= TSENS_8660_CONFIG << TSENS_8660_CONFIG_SHIFT;
+ }
+
+ reg_cntl |= GENMASK(tmdev->num_sensors - 1, 0) << TSENS_SENSOR0_SHIFT;
+ regmap_write(tmdev->map, TSENS_CNTL_ADDR, reg_cntl);
+
+ regmap_field_update_bits(tmdev->status_field,
+ TSENS_LOWER_STATUS_CLR | TSENS_UPPER_STATUS_CLR |
+ TSENS_MIN_STATUS_MASK | TSENS_MAX_STATUS_MASK,
+ TSENS_LOWER_STATUS_CLR | TSENS_UPPER_STATUS_CLR |
+ TSENS_MIN_STATUS_MASK | TSENS_MAX_STATUS_MASK);
+
+ reg_cntl |= TSENS_EN;
+ regmap_write(tmdev->map, TSENS_CNTL_ADDR, reg_cntl);
+
+ reg_thr = (TSENS_LOWER_LIMIT_TH << TSENS_THRESHOLD_LOWER_LIMIT_SHIFT) |
+ (TSENS_UPPER_LIMIT_TH << TSENS_THRESHOLD_UPPER_LIMIT_SHIFT) |
+ (TSENS_MIN_LIMIT_TH << TSENS_THRESHOLD_MIN_LIMIT_SHIFT) |
+ (TSENS_MAX_LIMIT_TH << TSENS_THRESHOLD_MAX_LIMIT_SHIFT);
+ regmap_write(tmdev->map, TSENS_THRESHOLD_ADDR, reg_thr);
+}
+
+static int
+tsens_calib_sensors8660(struct tsens_device *tmdev, struct regmap *map)
+{
+ u32 temp_data, data;
+ struct tsens_sensor *s = &tmdev->sensor[0];
+
+ if (regmap_read(map, tmdev->calib_offset, &temp_data))
+ return -EINVAL;
+
+ data = (temp_data >> 24) & 0xff;
+
+ if (!data) {
+ dev_err(tsens_dev, "QFPROM TSENS calibration data not present\n");
+ return -EINVAL;
+ }
+
+ s->offset = TSENS_CAL_MDEGC - s->slope * data;
+
+ return 0;
+}
+
+static int
+tsens_calib_sensors8960(struct tsens_device *tmdev, struct regmap *map)
+{
+ int i;
+ u32 temp_data[TSENS_MAX_SENSORS];
+ u8 *byte_data;
+ u32 fuse, redun, num_read;
+ struct tsens_sensor *s = tmdev->sensor;
+
+ fuse = tmdev->calib_offset;
+ redun = tmdev->backup_calib_offset;
+
+ /**
+ * syscon regmap is 32-bit data, but calibration data is 8-bit.
+ * read 4 bytes from regmap in a loop and then extract bytes seprately
+ */
+
+ num_read = DIV_ROUND_UP(tmdev->num_sensors, 4);
+
+ for (i = 0; i < num_read; i++) {
+ if (regmap_read(map, (redun + i*4), &temp_data[i]))
+ return -EINVAL;
+
+ if (!temp_data[i]) {
+ dev_dbg(tsens_dev, "Main calib data not valid\n");
+ if (regmap_read(map, (fuse + i*4), &temp_data[i]))
+ return -EINVAL;
+ }
+ }
+
+ byte_data = (u8 *)temp_data;
+
+ for (i = 0; i < tmdev->num_sensors; i++, s++) {
+ s->offset = TSENS_CAL_MDEGC - s->slope * byte_data[i];
+ dev_dbg(tsens_dev, "calib data %d is %c", i, byte_data[i]);
+ }
+
+ return 0;
+}
+
+static const struct thermal_zone_of_device_ops tsens_thermal_of_ops = {
+ .get_temp = tsens_tz_get_temp,
+};
+
+
+static int tsens_register(struct tsens_device *tmdev, int i)
+{
+ char name[18];
+ u32 addr = TSENS_S0_STATUS_ADDR;
+ struct tsens_sensor *s = &tmdev->sensor[i];
+
+ /*
+ * The status registers for each sensor are discontiguous
+ * because some SoCs have 5 sensors while others have more
+ * but the control registers stay in the same place, i.e.
+ * directly after the first 5 status registers.
+ */
+ if (i >= 5)
+ addr += 40;
+
+ addr += i * 4;
+
+ snprintf(name, sizeof(name), "tsens_tz_sensor%d", i);
+ s->mode = THERMAL_DEVICE_ENABLED;
+ s->sensor_num = i;
+ s->status = addr;
+ s->tmdev = tmdev;
+ s->tz_dev = thermal_zone_of_sensor_register(tsens_dev, i, s,
+ &tsens_thermal_of_ops);
+
+ if (IS_ERR(s->tz_dev))
+ return -ENODEV;
+
+ return 0;
+}
+
+static int tsens_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *base_node;
+ struct platform_device *base_pdev;
+ int ret, i, irq, num;
+ struct tsens_sensor *s;
+ struct tsens_device *tmdev;
+ struct regmap *map, *imem_regmap;
+ struct reg_field *field;
+ static struct reg_field status_0 = {
+ .reg = TSENS_8064_STATUS_CNTL,
+ .lsb = 0,
+ .msb = 3,
+ };
+ static struct reg_field status_8 = {
+ .reg = TSENS_CNTL_ADDR,
+ .lsb = 8,
+ .msb = 11,
+ };
+
+ tsens_dev = &pdev->dev;
+
+ num = of_property_count_u32_elems(np, "qcom,tsens-slopes");
+ if (num <= 0) {
+ dev_err(tsens_dev, "invalid tsens slopes\n");
+ return -EINVAL;
+ }
+
+ tmdev = devm_kzalloc(tsens_dev, sizeof(*tmdev) +
+ num * sizeof(struct tsens_sensor), GFP_KERNEL);
+ if (tmdev == NULL)
+ return -ENOMEM;
+
+ tmdev->num_sensors = num;
+ for (i = 0, s = tmdev->sensor; i < num; i++, s++)
+ of_property_read_u32_index(np, "qcom,tsens-slopes", i,
+ &s->slope);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(tsens_dev, "no irq resource?\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32_index(np, "qcom,calib-offsets", 0,
+ &tmdev->calib_offset);
+ if (ret != 0) {
+ dev_err(tsens_dev, "No calibration offset set\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32_index(np, "qcom,calib-offsets", 1,
+ &tmdev->backup_calib_offset);
+ if (ret) {
+ dev_info(tsens_dev, "Missing backup calibration offset\n");
+ tmdev->backup_calib_offset = tmdev->calib_offset;
+ }
+
+ imem_regmap = syscon_regmap_lookup_by_phandle(np, "qcom,imem");
+ if (IS_ERR(imem_regmap)) {
+ dev_err(tsens_dev, "syscon regmap look up error\n");
+ return PTR_ERR(imem_regmap);
+ }
+
+ if (num == 1)
+ ret = tsens_calib_sensors8660(tmdev, imem_regmap);
+ else
+ ret = tsens_calib_sensors8960(tmdev, imem_regmap);
+
+ if (ret < 0) {
+ dev_err(tsens_dev, "tsense calibration failed\n");
+ return ret;
+ }
+
+ base_node = of_parse_phandle(np, "qcom,tsens-base", 0);
+ if (base_node == NULL) {
+ dev_err(tsens_dev, "no base node present\n");
+ return -EINVAL;
+ }
+
+ base_pdev = of_find_device_by_node(base_node);
+ if (base_pdev == NULL) {
+ dev_err(tsens_dev, "no base pdev node\n");
+ return -ENODEV;
+ }
+
+ tmdev->map = map = dev_get_regmap(&base_pdev->dev, NULL);
+ if (map == NULL) {
+ dev_err(tsens_dev, "base regmap get failed\n");
+ return -ENODEV;
+ }
+
+ /* Status bits move when the sensor bits next to them overlap */
+ if (num > 5)
+ field = &status_0;
+ else
+ field = &status_8;
+
+ tmdev->status_field = devm_regmap_field_alloc(tsens_dev, map, *field);
+ if (IS_ERR(tmdev->status_field)) {
+ dev_err(tsens_dev, "regmap alloc failed\n");
+ return PTR_ERR(tmdev->status_field);
+ }
+
+ tsens_hw_init(tmdev);
+
+ /*
+ * Register sensor 0 separately. This sensor is always
+ * expected to be present and if this fails, thermal
+ * sensor probe would fail
+ * Other sensors are optional and if registration fails
+ * disable the sensor and continue
+ */
+ ret = tsens_register(tmdev, 0);
+ if (ret < 0) {
+ dev_err(tsens_dev, "Registering failed for primary sensor");
+ ret = -ENODEV;
+ goto fail;
+ } else {
+ tsens_tz_set_mode(&tmdev->sensor[0], THERMAL_DEVICE_ENABLED);
+ }
+
+ for (i = 1; i < tmdev->num_sensors; i++) {
+ ret = tsens_register(tmdev, i);
+
+ if (ret < 0) {
+ dev_err(tsens_dev,
+ "Registering failed. Sensor(%i), disabled", i);
+ tsens_tz_set_mode(&tmdev->sensor[i],
+ THERMAL_DEVICE_DISABLED);
+ } else {
+ tsens_tz_set_mode(&tmdev->sensor[i],
+ THERMAL_DEVICE_ENABLED);
+ }
+ }
+
+ INIT_WORK(&tmdev->tsens_work, tsens_scheduler_fn);
+
+ ret = devm_request_irq(tsens_dev, irq, tsens_isr, IRQF_TRIGGER_RISING,
+ "tsens", &tmdev->tsens_work);
+ if (ret < 0)
+ goto err_irq;
+
+ platform_set_drvdata(pdev, tmdev);
+
+ dev_info(tsens_dev, "Tsens driver initialized\n");
+
+ return 0;
+err_irq:
+ for (i = 0, s = tmdev->sensor; i < tmdev->num_sensors; i++, s++)
+ thermal_zone_of_sensor_unregister(&pdev->dev, s->tz_dev);
+fail:
+ tsens_disable_mode(tmdev);
+ return ret;
+}
+
+static int tsens_remove(struct platform_device *pdev)
+{
+ int i;
+ struct tsens_sensor *s;
+ struct tsens_device *tmdev = platform_get_drvdata(pdev);
+
+ tsens_disable_mode(tmdev);
+ for (i = 0, s = tmdev->sensor; i < tmdev->num_sensors; i++, s++)
+ thermal_zone_device_unregister(s->tz_dev);
+
+ return 0;
+}
+
+static struct of_device_id tsens_match_table[] = {
+ {.compatible = "qcom,ipq806x-tsens"},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, tsens_match_table);
+
+static struct platform_driver tsens_driver = {
+ .probe = tsens_probe,
+ .remove = tsens_remove,
+ .driver = {
+ .of_match_table = tsens_match_table,
+ .name = "tsens8960-thermal",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &tsens_pm_ops,
+#endif
+ },
+};
+module_platform_driver(tsens_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Temperature Sensor driver");
+MODULE_ALIAS("platform:tsens8960-tm");
--
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