// 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 frank@allwinnertech.com
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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/slab.h>
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#include <linux/thermal.h>
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#define MAX_SENSOR_NUM 4
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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 CALIBRATE_DEFAULT 0x800
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#define SUN50I_H616_THS_CTRL0 0x00
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#define SUN50I_H616_THS_ENABLE 0x04
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#define SUN50I_H616_THS_PC 0x08
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#define SUN50I_H616_THS_MFC 0x30
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#define SUN50I_H616_THS_TEMP_CALIB 0xa0
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#define SUN50I_H616_THS_TEMP_DATA 0xc0
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#define SUN50I_THS_CTRL0_T_ACQ(x) (GENMASK(15, 0) & (x))
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#define SUN50I_THS_CTRL0_FS_DIV(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_H616_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12)
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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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bool has_bus_clk;
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int sensor_num;
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int offset;
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int scale;
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int ft_deviation;
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int temp_data_base;
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int (*calibrate)(struct ths_device *tmdev,
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u16 *caldata, int callen);
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int (*init)(struct ths_device *tmdev);
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};
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struct ths_device {
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bool has_calibration;
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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 clk *bus_clk;
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struct clk *mod_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 sunxi_ths_reg2temp(struct ths_device *tmdev, int reg)
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{
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return (reg + tmdev->chip->offset) * tmdev->chip->scale;
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}
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static int sunxi_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 = 0;
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regmap_read(tmdev->regmap, tmdev->chip->temp_data_base +
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0x4 * s->id, &val);
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/* ths have no data yet */
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if (unlikely(!val))
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return -EAGAIN;
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*temp = sunxi_ths_reg2temp(tmdev, val);
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/*
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* There are problems with the calibration values of some platforms,
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* which makes the temperature calculated by the original temperature
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* calculation formula inaccurate. If the chip is calibrated, this
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* value is added by default.*/
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if (tmdev->has_calibration)
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*temp += tmdev->chip->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 = sunxi_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 int sun50i_h616_ths_calibrate(struct ths_device *tmdev,
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u16 *caldata, int callen)
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{
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struct device *dev = tmdev->dev;
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int i, ft_temp;
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if (!caldata[0])
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return -EINVAL;
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/*
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* efuse layout:
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*
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* 0 11 16 27 32 43 48 57
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* +----------+-----------+-----------+-----------+
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* | temp | |sensor0| |sensor1| |sensor2| |
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* +----------+-----------+-----------+-----------+
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* ^ ^ ^
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* | | |
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* | | sensor3[11:8]
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* | sensor3[7:4]
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* sensor3[3:0]
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*
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* The calibration data on the H616 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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*
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* We need to calculate a delta between measured and caluclated
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* register values and this will become a calibration offset.
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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 delta, cdata, offset, reg;
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if (i == 3)
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reg = (caldata[1] >> 12)
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| (caldata[2] >> 12 << 4)
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| (caldata[3] >> 12 << 8);
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else
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reg = (int)caldata[i + 1] & TEMP_CALIB_MASK;
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/*
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* Our calculation formula is like this,
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* the temp unit above is Celsius:
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*
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* T = (sensor_data + a) / b
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* cdata = 0x800 - [(ft_temp - T) * b]
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*
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* b is a floating-point number
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* with an absolute value less than 1000.
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*
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* sunxi_ths_reg2temp uses milli-degrees Celsius,
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* with offset and scale parameters.
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* T = (sensor_data + a) * 1000 / b
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*
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* ----------------------------------------------
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*
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* So:
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*
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* offset = a, scale = 1000 / b
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* cdata = 0x800 - [(ft_temp - T) * 1000 / scale]
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*/
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delta = (ft_temp * 100 - sunxi_ths_reg2temp(tmdev, reg))
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/ tmdev->chip->scale;
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cdata = CALIBRATE_DEFAULT - delta;
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if (cdata & ~TEMP_CALIB_MASK) {
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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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offset = (i % 2) * 16;
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regmap_update_bits(tmdev->regmap,
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SUN50I_H616_THS_TEMP_CALIB + (i / 2 * 4),
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0xfff << offset,
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cdata << offset);
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}
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tmdev->has_calibration = true;
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return 0;
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}
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static int sunxi_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 ret = 0;
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calcell = devm_nvmem_cell_get(dev, "calibration");
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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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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 put;
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}
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tmdev->chip->calibrate(tmdev, caldata, callen);
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kfree(caldata);
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put:
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devm_nvmem_cell_put(dev, calcell);
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out:
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return ret;
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}
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static int sunxi_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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if (tmdev->chip->has_bus_clk) {
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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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}
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ret = clk_prepare_enable(tmdev->bus_clk);
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if (ret)
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return ret;
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ret = sunxi_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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return ret;
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}
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static int sun50i_h616_thermal_init(struct ths_device *tmdev)
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{
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int val;
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/*
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* For sun50iw9p1:
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* It is necessary that reg[0x03000000] bit[16] is 0.
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*/
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regmap_write(tmdev->regmap, SUN50I_H616_THS_CTRL0,
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SUN50I_THS_CTRL0_T_ACQ(47) | SUN50I_THS_CTRL0_FS_DIV(479));
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regmap_write(tmdev->regmap, SUN50I_H616_THS_MFC,
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SUN50I_THS_FILTER_EN |
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SUN50I_THS_FILTER_TYPE(1));
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regmap_write(tmdev->regmap, SUN50I_H616_THS_PC,
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SUN50I_H616_THS_PC_TEMP_PERIOD(365));
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val = GENMASK(tmdev->chip->sensor_num - 1, 0);
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regmap_write(tmdev->regmap, SUN50I_H616_THS_ENABLE, val);
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return 0;
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}
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static int sunxi_ths_register(struct ths_device *tmdev)
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{
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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(tmdev->sensor[i].tzd);
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}
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return 0;
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}
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static int sunxi_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;
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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 = sunxi_ths_resource_init(tmdev);
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if (ret)
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return ret;
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ret = tmdev->chip->init(tmdev);
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if (ret)
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return ret;
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ret = sunxi_ths_register(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 sunxi_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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return 0;
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}
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static int __maybe_unused sunxi_thermal_suspend(struct device *dev)
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{
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struct ths_device *tmdev = dev_get_drvdata(dev);
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clk_disable_unprepare(tmdev->bus_clk);
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return 0;
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}
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static int __maybe_unused sunxi_thermal_resume(struct device *dev)
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{
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struct ths_device *tmdev = dev_get_drvdata(dev);
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clk_prepare_enable(tmdev->bus_clk);
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sunxi_ths_calibrate(tmdev);
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tmdev->chip->init(tmdev);
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return 0;
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}
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static const struct ths_thermal_chip sun50iw9p1_ths = {
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.sensor_num = 4,
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.has_bus_clk = true,
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.offset = -3255,
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.scale = -81,
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.ft_deviation = 8000,
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.temp_data_base = SUN50I_H616_THS_TEMP_DATA,
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.calibrate = sun50i_h616_ths_calibrate,
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.init = sun50i_h616_thermal_init,
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};
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static const struct ths_thermal_chip sun50iw10p1_ths = {
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.sensor_num = 3,
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.has_bus_clk = true,
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.offset = -2794,
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.scale = -67,
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.ft_deviation = 8000,
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.temp_data_base = SUN50I_H616_THS_TEMP_DATA,
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.calibrate = sun50i_h616_ths_calibrate,
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.init = sun50i_h616_thermal_init,
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};
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static const struct of_device_id of_ths_match[] = {
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{ .compatible = "allwinner,sun50iw9p1-ths", .data = &sun50iw9p1_ths },
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{ .compatible = "allwinner,sun50iw10p1-ths", .data = &sun50iw10p1_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 SIMPLE_DEV_PM_OPS(sunxi_thermal_pm_ops,
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sunxi_thermal_suspend, sunxi_thermal_resume);
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static struct platform_driver ths_driver = {
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.probe = sunxi_ths_probe,
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.remove = sunxi_ths_remove,
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.driver = {
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.name = "sunxi-thermal",
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.pm = &sunxi_thermal_pm_ops,
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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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