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![Julia Lawall](/assets/img/avatar_default.png)
The thermal_zone_of_device_ops structure is only passed as the fourth argument to devm_thermal_zone_of_sensor_register, which is declared as const. Thus the thermal_zone_of_device_ops structure itself can be const. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
419 lines
12 KiB
C
419 lines
12 KiB
C
/*
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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 <hdegoede@redhat.com>
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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 <clabbe.montjoie@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/README)
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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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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_ioremap_resource(dev,
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platform_get_resource(pdev, IORESOURCE_MEM, 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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devm_thermal_zone_of_sensor_register(ts->dev, 0, ts, &sun4i_ts_tz_ops);
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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 <hdegoede@redhat.com>");
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MODULE_LICENSE("GPL");
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