418 lines
10 KiB
C
418 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thermal sensor driver for Allwinner SOC
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* Copyright (C) 2019 Yangtao Li
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*
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* Based on the work of Icenowy Zheng <icenowy@aosc.io>
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* Based on the work of Ondrej Jirman <megous@megous.com>
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* Based on the work of Josef Gajdusek <atx@atx.name>
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#define MAX_SENSOR_NUM 4
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#define SUN50I_H6_OFFSET -2794
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#define SUN50I_H6_SCALE -67
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#define FT_TEMP_MASK GENMASK(11, 0)
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#define TEMP_CALIB_MASK GENMASK(11, 0)
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#define TEMP_TO_REG 672
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#define CALIBRATE_DEFAULT 0x800
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#define SUN50I_THS_CTRL0 0x00
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#define SUN50I_H6_THS_ENABLE 0x04
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#define SUN50I_H6_THS_PC 0x08
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#define SUN50I_H6_THS_DIC 0x10
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#define SUN50I_H6_THS_DIS 0x20
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#define SUN50I_H6_THS_MFC 0x30
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#define SUN50I_H6_THS_TEMP_CALIB 0xa0
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#define SUN50I_H6_THS_TEMP_DATA 0xc0
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#define SUN50I_THS_CTRL0_T_ACQ(x) ((GENMASK(15, 0) & (x)) << 16)
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#define SUN50I_THS_FILTER_EN BIT(2)
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#define SUN50I_THS_FILTER_TYPE(x) (GENMASK(1, 0) & (x))
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#define SUN50I_H6_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12)
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#define SUN50I_H6_THS_DATA_IRQ_STS(x) BIT(x)
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/* millidegree celsius */
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#define SUN50I_H6_FT_DEVIATION 7000
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struct ths_device;
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struct tsensor {
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struct ths_device *tmdev;
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struct thermal_zone_device *tzd;
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int id;
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};
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struct ths_thermal_chip {
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int sensor_num;
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};
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struct ths_device {
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const struct ths_thermal_chip *chip;
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struct device *dev;
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struct regmap *regmap;
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struct reset_control *reset;
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struct clk *bus_clk;
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struct tsensor sensor[MAX_SENSOR_NUM];
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};
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/* Temp Unit: millidegree Celsius */
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static int sun8i_ths_reg2temp(struct ths_device *tmdev,
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int reg)
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{
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return (reg + SUN50I_H6_OFFSET) * SUN50I_H6_SCALE;
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}
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static int sun8i_ths_get_temp(void *data, int *temp)
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{
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struct tsensor *s = data;
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struct ths_device *tmdev = s->tmdev;
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int val;
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regmap_read(tmdev->regmap, SUN50I_H6_THS_TEMP_DATA +
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0x4 * s->id, &val);
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/* ths have no data yet */
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if (!val)
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return -EBUSY;
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*temp = sun8i_ths_reg2temp(tmdev, val);
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/*
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* XX - According to the original sdk, there are some platforms(rarely)
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* that add a fixed offset value after calculating the temperature
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* value. We can't simply put it on the formula for calculating the
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* temperature above, because the formula for calculating the
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* temperature above is also used when the sensor is calibrated. If
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* do this, the correct calibration formula is hard to know.
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*/
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*temp += SUN50I_H6_FT_DEVIATION;
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return 0;
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}
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static const struct thermal_zone_of_device_ops ths_ops = {
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.get_temp = sun8i_ths_get_temp,
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};
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static const struct regmap_config config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.fast_io = true,
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};
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static irqreturn_t sun50i_h6_irq_thread(int irq, void *data)
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{
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struct ths_device *tmdev = data;
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int i, state;
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regmap_read(tmdev->regmap, SUN50I_H6_THS_DIS, &state);
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for (i = 0; i < tmdev->chip->sensor_num; i++) {
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if (state & SUN50I_H6_THS_DATA_IRQ_STS(i)) {
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/* clear data irq pending */
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regmap_write(tmdev->regmap, SUN50I_H6_THS_DIS,
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SUN50I_H6_THS_DATA_IRQ_STS(i));
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thermal_zone_device_update(tmdev->sensor[i].tzd,
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THERMAL_EVENT_UNSPECIFIED);
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}
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}
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return IRQ_HANDLED;
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}
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static int sun50i_ths_calibrate(struct ths_device *tmdev)
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{
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struct nvmem_cell *calcell;
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struct device *dev = tmdev->dev;
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u16 *caldata;
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size_t callen;
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int ft_temp;
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int i, ret = 0;
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calcell = devm_nvmem_cell_get(dev, "calib");
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if (IS_ERR(calcell)) {
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if (PTR_ERR(calcell) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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/*
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* Even if the external calibration data stored in sid is
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* not accessible, the THS hardware can still work, although
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* the data won't be so accurate.
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*
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* The default value of calibration register is 0x800 for
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* every sensor, and the calibration value is usually 0x7xx
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* or 0x8xx, so they won't be away from the default value
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* for a lot.
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*
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* So here we do not return error if the calibartion data is
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* not available, except the probe needs deferring.
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*/
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goto out;
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}
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caldata = nvmem_cell_read(calcell, &callen);
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if (IS_ERR(caldata)) {
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ret = PTR_ERR(caldata);
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goto out;
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}
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if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num) {
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ret = -EINVAL;
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goto out_free;
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}
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/*
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* efuse layout:
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*
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* 0 11 16 32
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* +-------+-------+-------+
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* |temp| |sensor0|sensor1|
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* +-------+-------+-------+
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*
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* The calibration data on the H6 is the ambient temperature and
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* sensor values that are filled during the factory test stage.
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*
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* The unit of stored FT temperature is 0.1 degreee celusis.
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* Through the stored ambient temperature and the data read
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* by the sensor, after a certain calculation, the calibration
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* value to be compensated can be obtained.
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*/
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ft_temp = caldata[0] & FT_TEMP_MASK;
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for (i = 0; i < tmdev->chip->sensor_num; i++) {
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int reg = (int)caldata[i + 1];
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int sensor_temp = sun8i_ths_reg2temp(tmdev, reg);
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int delta, cdata, calib_offest;
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/*
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* To calculate the calibration value:
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*
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* X(in Celsius) = Ts - ft_temp
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* delta = X * 10000 / TEMP_TO_REG
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* cdata = CALIBRATE_DEFAULT - delta
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*
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* cdata: calibration value
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*/
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delta = (sensor_temp - ft_temp * 100) * 10 / TEMP_TO_REG;
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cdata = CALIBRATE_DEFAULT - delta;
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if (cdata & ~TEMP_CALIB_MASK) {
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/*
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* Calibration value more than 12-bit, but calibration
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* register is 12-bit. In this case, ths hardware can
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* still work without calibration, although the data
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* won't be so accurate.
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*/
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dev_warn(dev, "sensor%d is not calibrated.\n", i);
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continue;
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}
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calib_offest = SUN50I_H6_THS_TEMP_CALIB + (i / 2) * 0x4;
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if (i % 2) {
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int val;
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regmap_read(tmdev->regmap, calib_offest, &val);
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val = (val & TEMP_CALIB_MASK) | (cdata << 16);
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regmap_write(tmdev->regmap, calib_offest, val);
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} else {
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regmap_write(tmdev->regmap, calib_offest, cdata);
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}
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}
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out_free:
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kfree(caldata);
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out:
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return ret;
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}
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static int sun8i_ths_resource_init(struct ths_device *tmdev)
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{
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struct device *dev = tmdev->dev;
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struct platform_device *pdev = to_platform_device(dev);
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struct resource *mem;
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void __iomem *base;
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int ret;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, mem);
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if (IS_ERR(base))
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return PTR_ERR(base);
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tmdev->regmap = devm_regmap_init_mmio(dev, base, &config);
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if (IS_ERR(tmdev->regmap))
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return PTR_ERR(tmdev->regmap);
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tmdev->reset = devm_reset_control_get(dev, 0);
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if (IS_ERR(tmdev->reset))
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return PTR_ERR(tmdev->reset);
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tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus");
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if (IS_ERR(tmdev->bus_clk))
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return PTR_ERR(tmdev->bus_clk);
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ret = reset_control_deassert(tmdev->reset);
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if (ret)
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return ret;
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ret = clk_prepare_enable(tmdev->bus_clk);
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if (ret)
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goto assert_reset;
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ret = sun50i_ths_calibrate(tmdev);
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if (ret)
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goto bus_disable;
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return 0;
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bus_disable:
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clk_disable_unprepare(tmdev->bus_clk);
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assert_reset:
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reset_control_assert(tmdev->reset);
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return ret;
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}
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static int sun50i_thermal_init(struct ths_device *tmdev)
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{
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int val;
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/*
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* clkin = 24MHz
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* T acquire = clkin / (x + 1)
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* = 20us
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*/
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regmap_write(tmdev->regmap, SUN50I_THS_CTRL0,
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SUN50I_THS_CTRL0_T_ACQ(479));
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/* average over 4 samples */
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regmap_write(tmdev->regmap, SUN50I_H6_THS_MFC,
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SUN50I_THS_FILTER_EN |
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SUN50I_THS_FILTER_TYPE(1));
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/* period = (x + 1) * 4096 / clkin; ~10ms */
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regmap_write(tmdev->regmap, SUN50I_H6_THS_PC,
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SUN50I_H6_THS_PC_TEMP_PERIOD(58));
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/* enable sensor */
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val = GENMASK(tmdev->chip->sensor_num - 1, 0);
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regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val);
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/* thermal data interrupt enable */
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val = GENMASK(tmdev->chip->sensor_num - 1, 0);
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regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val);
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return 0;
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}
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static int sun8i_ths_register(struct ths_device *tmdev)
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{
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struct thermal_zone_device *tzd;
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int i;
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for (i = 0; i < tmdev->chip->sensor_num; i++) {
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tmdev->sensor[i].tmdev = tmdev;
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tmdev->sensor[i].id = i;
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tmdev->sensor[i].tzd =
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devm_thermal_zone_of_sensor_register(tmdev->dev,
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i,
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&tmdev->sensor[i],
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&ths_ops);
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if (IS_ERR(tmdev->sensor[i].tzd))
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return PTR_ERR(tzd);
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}
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return 0;
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}
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static int sun8i_ths_probe(struct platform_device *pdev)
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{
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struct ths_device *tmdev;
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struct device *dev = &pdev->dev;
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int ret, irq;
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tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL);
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if (!tmdev)
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return -ENOMEM;
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tmdev->dev = dev;
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tmdev->chip = of_device_get_match_data(&pdev->dev);
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if (!tmdev->chip)
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return -EINVAL;
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platform_set_drvdata(pdev, tmdev);
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ret = sun8i_ths_resource_init(tmdev);
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if (ret)
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return ret;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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ret = sun50i_thermal_init(tmdev);
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if (ret)
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return ret;
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ret = sun8i_ths_register(tmdev);
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if (ret)
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return ret;
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/*
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* Avoid entering the interrupt handler, the thermal device is not
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* registered yet, we deffer the registration of the interrupt to
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* the end.
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*/
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ret = devm_request_threaded_irq(dev, irq, NULL,
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sun50i_h6_irq_thread,
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IRQF_ONESHOT, "ths", tmdev);
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if (ret)
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return ret;
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return ret;
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}
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static int sun8i_ths_remove(struct platform_device *pdev)
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{
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struct ths_device *tmdev = platform_get_drvdata(pdev);
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clk_disable_unprepare(tmdev->bus_clk);
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reset_control_assert(tmdev->reset);
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return 0;
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}
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static const struct ths_thermal_chip sun50i_h6_ths = {
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.sensor_num = 2,
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};
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static const struct of_device_id of_ths_match[] = {
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{ .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, of_ths_match);
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static struct platform_driver ths_driver = {
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.probe = sun8i_ths_probe,
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.remove = sun8i_ths_remove,
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.driver = {
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.name = "sun8i-thermal",
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.of_match_table = of_ths_match,
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},
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};
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module_platform_driver(ths_driver);
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MODULE_DESCRIPTION("Thermal sensor driver for Allwinner SOC");
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MODULE_LICENSE("GPL v2");
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