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413 lines
12 KiB
413 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Allwinner sunxi resistive touchscreen controller driver |
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* |
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* Copyright (C) 2013 - 2014 Hans de Goede <[email protected]> |
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* |
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* The hwmon parts are based on work by Corentin LABBE which is: |
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* Copyright (C) 2013 Corentin LABBE <[email protected]> |
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*/ |
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/* |
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* The sun4i-ts controller is capable of detecting a second touch, but when a |
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* second touch is present then the accuracy becomes so bad the reported touch |
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* location is not useable. |
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* |
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* The original android driver contains some complicated heuristics using the |
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* aprox. distance between the 2 touches to see if the user is making a pinch |
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* open / close movement, and then reports emulated multi-touch events around |
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* the last touch coordinate (as the dual-touch coordinates are worthless). |
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* |
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* These kinds of heuristics are just asking for trouble (and don't belong |
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* in the kernel). So this driver offers straight forward, reliable single |
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* touch functionality only. |
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* |
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* s.a. A20 User Manual "1.15 TP" (Documentation/arm/sunxi.rst) |
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* (looks like the description in the A20 User Manual v1.3 is better |
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* than the one in the A10 User Manual v.1.5) |
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*/ |
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#include <linux/err.h> |
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#include <linux/hwmon.h> |
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#include <linux/thermal.h> |
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#include <linux/init.h> |
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#include <linux/input.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#define TP_CTRL0 0x00 |
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#define TP_CTRL1 0x04 |
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#define TP_CTRL2 0x08 |
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#define TP_CTRL3 0x0c |
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#define TP_INT_FIFOC 0x10 |
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#define TP_INT_FIFOS 0x14 |
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#define TP_TPR 0x18 |
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#define TP_CDAT 0x1c |
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#define TEMP_DATA 0x20 |
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#define TP_DATA 0x24 |
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/* TP_CTRL0 bits */ |
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#define ADC_FIRST_DLY(x) ((x) << 24) /* 8 bits */ |
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#define ADC_FIRST_DLY_MODE(x) ((x) << 23) |
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#define ADC_CLK_SEL(x) ((x) << 22) |
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#define ADC_CLK_DIV(x) ((x) << 20) /* 3 bits */ |
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#define FS_DIV(x) ((x) << 16) /* 4 bits */ |
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#define T_ACQ(x) ((x) << 0) /* 16 bits */ |
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/* TP_CTRL1 bits */ |
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#define STYLUS_UP_DEBOUN(x) ((x) << 12) /* 8 bits */ |
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#define STYLUS_UP_DEBOUN_EN(x) ((x) << 9) |
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#define TOUCH_PAN_CALI_EN(x) ((x) << 6) |
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#define TP_DUAL_EN(x) ((x) << 5) |
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#define TP_MODE_EN(x) ((x) << 4) |
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#define TP_ADC_SELECT(x) ((x) << 3) |
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#define ADC_CHAN_SELECT(x) ((x) << 0) /* 3 bits */ |
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/* on sun6i, bits 3~6 are left shifted by 1 to 4~7 */ |
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#define SUN6I_TP_MODE_EN(x) ((x) << 5) |
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/* TP_CTRL2 bits */ |
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#define TP_SENSITIVE_ADJUST(x) ((x) << 28) /* 4 bits */ |
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#define TP_MODE_SELECT(x) ((x) << 26) /* 2 bits */ |
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#define PRE_MEA_EN(x) ((x) << 24) |
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#define PRE_MEA_THRE_CNT(x) ((x) << 0) /* 24 bits */ |
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/* TP_CTRL3 bits */ |
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#define FILTER_EN(x) ((x) << 2) |
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#define FILTER_TYPE(x) ((x) << 0) /* 2 bits */ |
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/* TP_INT_FIFOC irq and fifo mask / control bits */ |
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#define TEMP_IRQ_EN(x) ((x) << 18) |
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#define OVERRUN_IRQ_EN(x) ((x) << 17) |
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#define DATA_IRQ_EN(x) ((x) << 16) |
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#define TP_DATA_XY_CHANGE(x) ((x) << 13) |
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#define FIFO_TRIG(x) ((x) << 8) /* 5 bits */ |
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#define DATA_DRQ_EN(x) ((x) << 7) |
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#define FIFO_FLUSH(x) ((x) << 4) |
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#define TP_UP_IRQ_EN(x) ((x) << 1) |
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#define TP_DOWN_IRQ_EN(x) ((x) << 0) |
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/* TP_INT_FIFOS irq and fifo status bits */ |
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#define TEMP_DATA_PENDING BIT(18) |
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#define FIFO_OVERRUN_PENDING BIT(17) |
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#define FIFO_DATA_PENDING BIT(16) |
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#define TP_IDLE_FLG BIT(2) |
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#define TP_UP_PENDING BIT(1) |
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#define TP_DOWN_PENDING BIT(0) |
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/* TP_TPR bits */ |
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#define TEMP_ENABLE(x) ((x) << 16) |
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#define TEMP_PERIOD(x) ((x) << 0) /* t = x * 256 * 16 / clkin */ |
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struct sun4i_ts_data { |
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struct device *dev; |
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struct input_dev *input; |
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void __iomem *base; |
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unsigned int irq; |
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bool ignore_fifo_data; |
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int temp_data; |
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int temp_offset; |
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int temp_step; |
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}; |
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static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val) |
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{ |
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u32 x, y; |
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if (reg_val & FIFO_DATA_PENDING) { |
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x = readl(ts->base + TP_DATA); |
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y = readl(ts->base + TP_DATA); |
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/* The 1st location reported after an up event is unreliable */ |
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if (!ts->ignore_fifo_data) { |
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input_report_abs(ts->input, ABS_X, x); |
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input_report_abs(ts->input, ABS_Y, y); |
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/* |
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* The hardware has a separate down status bit, but |
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* that gets set before we get the first location, |
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* resulting in reporting a click on the old location. |
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*/ |
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input_report_key(ts->input, BTN_TOUCH, 1); |
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input_sync(ts->input); |
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} else { |
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ts->ignore_fifo_data = false; |
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} |
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} |
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if (reg_val & TP_UP_PENDING) { |
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ts->ignore_fifo_data = true; |
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input_report_key(ts->input, BTN_TOUCH, 0); |
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input_sync(ts->input); |
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} |
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} |
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static irqreturn_t sun4i_ts_irq(int irq, void *dev_id) |
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{ |
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struct sun4i_ts_data *ts = dev_id; |
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u32 reg_val; |
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reg_val = readl(ts->base + TP_INT_FIFOS); |
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if (reg_val & TEMP_DATA_PENDING) |
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ts->temp_data = readl(ts->base + TEMP_DATA); |
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if (ts->input) |
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sun4i_ts_irq_handle_input(ts, reg_val); |
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writel(reg_val, ts->base + TP_INT_FIFOS); |
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return IRQ_HANDLED; |
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} |
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static int sun4i_ts_open(struct input_dev *dev) |
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{ |
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struct sun4i_ts_data *ts = input_get_drvdata(dev); |
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/* Flush, set trig level to 1, enable temp, data and up irqs */ |
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writel(TEMP_IRQ_EN(1) | DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | |
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TP_UP_IRQ_EN(1), ts->base + TP_INT_FIFOC); |
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return 0; |
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} |
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static void sun4i_ts_close(struct input_dev *dev) |
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{ |
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struct sun4i_ts_data *ts = input_get_drvdata(dev); |
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/* Deactivate all input IRQs */ |
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writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); |
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} |
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static int sun4i_get_temp(const struct sun4i_ts_data *ts, int *temp) |
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{ |
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/* No temp_data until the first irq */ |
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if (ts->temp_data == -1) |
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return -EAGAIN; |
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*temp = ts->temp_data * ts->temp_step - ts->temp_offset; |
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return 0; |
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} |
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static int sun4i_get_tz_temp(void *data, int *temp) |
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{ |
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return sun4i_get_temp(data, temp); |
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} |
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static const struct thermal_zone_of_device_ops sun4i_ts_tz_ops = { |
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.get_temp = sun4i_get_tz_temp, |
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}; |
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static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, |
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char *buf) |
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{ |
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struct sun4i_ts_data *ts = dev_get_drvdata(dev); |
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int temp; |
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int error; |
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error = sun4i_get_temp(ts, &temp); |
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if (error) |
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return error; |
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return sprintf(buf, "%d\n", temp); |
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} |
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static ssize_t show_temp_label(struct device *dev, |
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struct device_attribute *devattr, char *buf) |
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{ |
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return sprintf(buf, "SoC temperature\n"); |
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} |
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); |
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static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL); |
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static struct attribute *sun4i_ts_attrs[] = { |
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&dev_attr_temp1_input.attr, |
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&dev_attr_temp1_label.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(sun4i_ts); |
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static int sun4i_ts_probe(struct platform_device *pdev) |
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{ |
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struct sun4i_ts_data *ts; |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev->of_node; |
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struct device *hwmon; |
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struct thermal_zone_device *thermal; |
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int error; |
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u32 reg; |
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bool ts_attached; |
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u32 tp_sensitive_adjust = 15; |
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u32 filter_type = 1; |
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ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL); |
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if (!ts) |
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return -ENOMEM; |
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ts->dev = dev; |
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ts->ignore_fifo_data = true; |
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ts->temp_data = -1; |
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if (of_device_is_compatible(np, "allwinner,sun6i-a31-ts")) { |
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/* Allwinner SDK has temperature (C) = (value / 6) - 271 */ |
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ts->temp_offset = 271000; |
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ts->temp_step = 167; |
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} else if (of_device_is_compatible(np, "allwinner,sun4i-a10-ts")) { |
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/* |
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* The A10 temperature sensor has quite a wide spread, these |
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* parameters are based on the averaging of the calibration |
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* results of 4 completely different boards, with a spread of |
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* temp_step from 0.096 - 0.170 and temp_offset from 176 - 331. |
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*/ |
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ts->temp_offset = 257000; |
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ts->temp_step = 133; |
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} else { |
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/* |
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* The user manuals do not contain the formula for calculating |
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* the temperature. The formula used here is from the AXP209, |
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* which is designed by X-Powers, an affiliate of Allwinner: |
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* |
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* temperature (C) = (value * 0.1) - 144.7 |
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* |
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* Allwinner does not have any documentation whatsoever for |
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* this hardware. Moreover, it is claimed that the sensor |
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* is inaccurate and cannot work properly. |
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*/ |
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ts->temp_offset = 144700; |
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ts->temp_step = 100; |
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} |
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ts_attached = of_property_read_bool(np, "allwinner,ts-attached"); |
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if (ts_attached) { |
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ts->input = devm_input_allocate_device(dev); |
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if (!ts->input) |
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return -ENOMEM; |
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ts->input->name = pdev->name; |
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ts->input->phys = "sun4i_ts/input0"; |
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ts->input->open = sun4i_ts_open; |
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ts->input->close = sun4i_ts_close; |
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ts->input->id.bustype = BUS_HOST; |
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ts->input->id.vendor = 0x0001; |
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ts->input->id.product = 0x0001; |
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ts->input->id.version = 0x0100; |
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ts->input->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS); |
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__set_bit(BTN_TOUCH, ts->input->keybit); |
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input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0); |
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input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0); |
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input_set_drvdata(ts->input, ts); |
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} |
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ts->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(ts->base)) |
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return PTR_ERR(ts->base); |
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ts->irq = platform_get_irq(pdev, 0); |
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error = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts); |
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if (error) |
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return error; |
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/* |
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* Select HOSC clk, clkin = clk / 6, adc samplefreq = clkin / 8192, |
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* t_acq = clkin / (16 * 64) |
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*/ |
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writel(ADC_CLK_SEL(0) | ADC_CLK_DIV(2) | FS_DIV(7) | T_ACQ(63), |
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ts->base + TP_CTRL0); |
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/* |
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* tp_sensitive_adjust is an optional property |
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* tp_mode = 0 : only x and y coordinates, as we don't use dual touch |
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*/ |
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of_property_read_u32(np, "allwinner,tp-sensitive-adjust", |
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&tp_sensitive_adjust); |
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writel(TP_SENSITIVE_ADJUST(tp_sensitive_adjust) | TP_MODE_SELECT(0), |
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ts->base + TP_CTRL2); |
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/* |
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* Enable median and averaging filter, optional property for |
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* filter type. |
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*/ |
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of_property_read_u32(np, "allwinner,filter-type", &filter_type); |
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writel(FILTER_EN(1) | FILTER_TYPE(filter_type), ts->base + TP_CTRL3); |
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/* Enable temperature measurement, period 1953 (2 seconds) */ |
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writel(TEMP_ENABLE(1) | TEMP_PERIOD(1953), ts->base + TP_TPR); |
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/* |
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* Set stylus up debounce to aprox 10 ms, enable debounce, and |
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* finally enable tp mode. |
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*/ |
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reg = STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1); |
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if (of_device_is_compatible(np, "allwinner,sun6i-a31-ts")) |
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reg |= SUN6I_TP_MODE_EN(1); |
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else |
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reg |= TP_MODE_EN(1); |
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writel(reg, ts->base + TP_CTRL1); |
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/* |
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* The thermal core does not register hwmon devices for DT-based |
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* thermal zone sensors, such as this one. |
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*/ |
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hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts", |
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ts, sun4i_ts_groups); |
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if (IS_ERR(hwmon)) |
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return PTR_ERR(hwmon); |
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thermal = devm_thermal_zone_of_sensor_register(ts->dev, 0, ts, |
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&sun4i_ts_tz_ops); |
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if (IS_ERR(thermal)) |
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return PTR_ERR(thermal); |
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writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); |
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if (ts_attached) { |
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error = input_register_device(ts->input); |
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if (error) { |
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writel(0, ts->base + TP_INT_FIFOC); |
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return error; |
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} |
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} |
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platform_set_drvdata(pdev, ts); |
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return 0; |
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} |
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static int sun4i_ts_remove(struct platform_device *pdev) |
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{ |
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struct sun4i_ts_data *ts = platform_get_drvdata(pdev); |
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/* Explicit unregister to avoid open/close changing the imask later */ |
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if (ts->input) |
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input_unregister_device(ts->input); |
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/* Deactivate all IRQs */ |
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writel(0, ts->base + TP_INT_FIFOC); |
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return 0; |
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} |
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static const struct of_device_id sun4i_ts_of_match[] = { |
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{ .compatible = "allwinner,sun4i-a10-ts", }, |
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{ .compatible = "allwinner,sun5i-a13-ts", }, |
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{ .compatible = "allwinner,sun6i-a31-ts", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, sun4i_ts_of_match); |
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static struct platform_driver sun4i_ts_driver = { |
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.driver = { |
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.name = "sun4i-ts", |
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.of_match_table = of_match_ptr(sun4i_ts_of_match), |
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}, |
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.probe = sun4i_ts_probe, |
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.remove = sun4i_ts_remove, |
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}; |
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module_platform_driver(sun4i_ts_driver); |
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MODULE_DESCRIPTION("Allwinner sun4i resistive touchscreen controller driver"); |
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MODULE_AUTHOR("Hans de Goede <[email protected]>"); |
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MODULE_LICENSE("GPL");
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