| /* |
| * Allwinner sunxi resistive touchscreen controller driver |
| * |
| * Copyright (C) 2013 - 2014 Hans de Goede <hdegoede@redhat.com> |
| * |
| * The hwmon parts are based on work by Corentin LABBE which is: |
| * Copyright (C) 2013 Corentin LABBE <clabbe.montjoie@gmail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| /* |
| * The sun4i-ts controller is capable of detecting a second touch, but when a |
| * second touch is present then the accuracy becomes so bad the reported touch |
| * location is not useable. |
| * |
| * The original android driver contains some complicated heuristics using the |
| * aprox. distance between the 2 touches to see if the user is making a pinch |
| * open / close movement, and then reports emulated multi-touch events around |
| * the last touch coordinate (as the dual-touch coordinates are worthless). |
| * |
| * These kinds of heuristics are just asking for trouble (and don't belong |
| * in the kernel). So this driver offers straight forward, reliable single |
| * touch functionality only. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/hwmon.h> |
| #include <linux/init.h> |
| #include <linux/input.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/of_platform.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| |
| #define TP_CTRL0 0x00 |
| #define TP_CTRL1 0x04 |
| #define TP_CTRL2 0x08 |
| #define TP_CTRL3 0x0c |
| #define TP_INT_FIFOC 0x10 |
| #define TP_INT_FIFOS 0x14 |
| #define TP_TPR 0x18 |
| #define TP_CDAT 0x1c |
| #define TEMP_DATA 0x20 |
| #define TP_DATA 0x24 |
| |
| /* TP_CTRL0 bits */ |
| #define ADC_FIRST_DLY(x) ((x) << 24) /* 8 bits */ |
| #define ADC_FIRST_DLY_MODE(x) ((x) << 23) |
| #define ADC_CLK_SEL(x) ((x) << 22) |
| #define ADC_CLK_DIV(x) ((x) << 20) /* 3 bits */ |
| #define FS_DIV(x) ((x) << 16) /* 4 bits */ |
| #define T_ACQ(x) ((x) << 0) /* 16 bits */ |
| |
| /* TP_CTRL1 bits */ |
| #define STYLUS_UP_DEBOUN(x) ((x) << 12) /* 8 bits */ |
| #define STYLUS_UP_DEBOUN_EN(x) ((x) << 9) |
| #define TOUCH_PAN_CALI_EN(x) ((x) << 6) |
| #define TP_DUAL_EN(x) ((x) << 5) |
| #define TP_MODE_EN(x) ((x) << 4) |
| #define TP_ADC_SELECT(x) ((x) << 3) |
| #define ADC_CHAN_SELECT(x) ((x) << 0) /* 3 bits */ |
| |
| /* TP_CTRL2 bits */ |
| #define TP_SENSITIVE_ADJUST(x) ((x) << 28) /* 4 bits */ |
| #define TP_MODE_SELECT(x) ((x) << 26) /* 2 bits */ |
| #define PRE_MEA_EN(x) ((x) << 24) |
| #define PRE_MEA_THRE_CNT(x) ((x) << 0) /* 24 bits */ |
| |
| /* TP_CTRL3 bits */ |
| #define FILTER_EN(x) ((x) << 2) |
| #define FILTER_TYPE(x) ((x) << 0) /* 2 bits */ |
| |
| /* TP_INT_FIFOC irq and fifo mask / control bits */ |
| #define TEMP_IRQ_EN(x) ((x) << 18) |
| #define OVERRUN_IRQ_EN(x) ((x) << 17) |
| #define DATA_IRQ_EN(x) ((x) << 16) |
| #define TP_DATA_XY_CHANGE(x) ((x) << 13) |
| #define FIFO_TRIG(x) ((x) << 8) /* 5 bits */ |
| #define DATA_DRQ_EN(x) ((x) << 7) |
| #define FIFO_FLUSH(x) ((x) << 4) |
| #define TP_UP_IRQ_EN(x) ((x) << 1) |
| #define TP_DOWN_IRQ_EN(x) ((x) << 0) |
| |
| /* TP_INT_FIFOS irq and fifo status bits */ |
| #define TEMP_DATA_PENDING BIT(18) |
| #define FIFO_OVERRUN_PENDING BIT(17) |
| #define FIFO_DATA_PENDING BIT(16) |
| #define TP_IDLE_FLG BIT(2) |
| #define TP_UP_PENDING BIT(1) |
| #define TP_DOWN_PENDING BIT(0) |
| |
| /* TP_TPR bits */ |
| #define TEMP_ENABLE(x) ((x) << 16) |
| #define TEMP_PERIOD(x) ((x) << 0) /* t = x * 256 * 16 / clkin */ |
| |
| struct sun4i_ts_data { |
| struct device *dev; |
| struct input_dev *input; |
| void __iomem *base; |
| unsigned int irq; |
| bool ignore_fifo_data; |
| int temp_data; |
| }; |
| |
| static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val) |
| { |
| u32 x, y; |
| |
| if (reg_val & FIFO_DATA_PENDING) { |
| x = readl(ts->base + TP_DATA); |
| y = readl(ts->base + TP_DATA); |
| /* The 1st location reported after an up event is unreliable */ |
| if (!ts->ignore_fifo_data) { |
| input_report_abs(ts->input, ABS_X, x); |
| input_report_abs(ts->input, ABS_Y, y); |
| /* |
| * The hardware has a separate down status bit, but |
| * that gets set before we get the first location, |
| * resulting in reporting a click on the old location. |
| */ |
| input_report_key(ts->input, BTN_TOUCH, 1); |
| input_sync(ts->input); |
| } else { |
| ts->ignore_fifo_data = false; |
| } |
| } |
| |
| if (reg_val & TP_UP_PENDING) { |
| ts->ignore_fifo_data = true; |
| input_report_key(ts->input, BTN_TOUCH, 0); |
| input_sync(ts->input); |
| } |
| } |
| |
| static irqreturn_t sun4i_ts_irq(int irq, void *dev_id) |
| { |
| struct sun4i_ts_data *ts = dev_id; |
| u32 reg_val; |
| |
| reg_val = readl(ts->base + TP_INT_FIFOS); |
| |
| if (reg_val & TEMP_DATA_PENDING) |
| ts->temp_data = readl(ts->base + TEMP_DATA); |
| |
| if (ts->input) |
| sun4i_ts_irq_handle_input(ts, reg_val); |
| |
| writel(reg_val, ts->base + TP_INT_FIFOS); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int sun4i_ts_open(struct input_dev *dev) |
| { |
| struct sun4i_ts_data *ts = input_get_drvdata(dev); |
| |
| /* Flush, set trig level to 1, enable temp, data and up irqs */ |
| writel(TEMP_IRQ_EN(1) | DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | |
| TP_UP_IRQ_EN(1), ts->base + TP_INT_FIFOC); |
| |
| return 0; |
| } |
| |
| static void sun4i_ts_close(struct input_dev *dev) |
| { |
| struct sun4i_ts_data *ts = input_get_drvdata(dev); |
| |
| /* Deactivate all input IRQs */ |
| writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); |
| } |
| |
| static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, |
| char *buf) |
| { |
| struct sun4i_ts_data *ts = dev_get_drvdata(dev); |
| |
| /* No temp_data until the first irq */ |
| if (ts->temp_data == -1) |
| return -EAGAIN; |
| |
| return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100); |
| } |
| |
| static ssize_t show_temp_label(struct device *dev, |
| struct device_attribute *devattr, char *buf) |
| { |
| return sprintf(buf, "SoC temperature\n"); |
| } |
| |
| static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); |
| static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL); |
| |
| static struct attribute *sun4i_ts_attrs[] = { |
| &dev_attr_temp1_input.attr, |
| &dev_attr_temp1_label.attr, |
| NULL |
| }; |
| ATTRIBUTE_GROUPS(sun4i_ts); |
| |
| static int sun4i_ts_probe(struct platform_device *pdev) |
| { |
| struct sun4i_ts_data *ts; |
| struct device *dev = &pdev->dev; |
| struct device_node *np = dev->of_node; |
| struct device *hwmon; |
| int error; |
| bool ts_attached; |
| |
| ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL); |
| if (!ts) |
| return -ENOMEM; |
| |
| ts->dev = dev; |
| ts->ignore_fifo_data = true; |
| ts->temp_data = -1; |
| |
| ts_attached = of_property_read_bool(np, "allwinner,ts-attached"); |
| if (ts_attached) { |
| ts->input = devm_input_allocate_device(dev); |
| if (!ts->input) |
| return -ENOMEM; |
| |
| ts->input->name = pdev->name; |
| ts->input->phys = "sun4i_ts/input0"; |
| ts->input->open = sun4i_ts_open; |
| ts->input->close = sun4i_ts_close; |
| ts->input->id.bustype = BUS_HOST; |
| ts->input->id.vendor = 0x0001; |
| ts->input->id.product = 0x0001; |
| ts->input->id.version = 0x0100; |
| ts->input->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS); |
| __set_bit(BTN_TOUCH, ts->input->keybit); |
| input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0); |
| input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0); |
| input_set_drvdata(ts->input, ts); |
| } |
| |
| ts->base = devm_ioremap_resource(dev, |
| platform_get_resource(pdev, IORESOURCE_MEM, 0)); |
| if (IS_ERR(ts->base)) |
| return PTR_ERR(ts->base); |
| |
| ts->irq = platform_get_irq(pdev, 0); |
| error = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts); |
| if (error) |
| return error; |
| |
| /* |
| * Select HOSC clk, clkin = clk / 6, adc samplefreq = clkin / 8192, |
| * t_acq = clkin / (16 * 64) |
| */ |
| writel(ADC_CLK_SEL(0) | ADC_CLK_DIV(2) | FS_DIV(7) | T_ACQ(63), |
| ts->base + TP_CTRL0); |
| |
| /* |
| * sensitive_adjust = 15 : max, which is not all that sensitive, |
| * tp_mode = 0 : only x and y coordinates, as we don't use dual touch |
| */ |
| writel(TP_SENSITIVE_ADJUST(15) | TP_MODE_SELECT(0), |
| ts->base + TP_CTRL2); |
| |
| /* Enable median filter, type 1 : 5/3 */ |
| writel(FILTER_EN(1) | FILTER_TYPE(1), ts->base + TP_CTRL3); |
| |
| /* Enable temperature measurement, period 1953 (2 seconds) */ |
| writel(TEMP_ENABLE(1) | TEMP_PERIOD(1953), ts->base + TP_TPR); |
| |
| /* |
| * Set stylus up debounce to aprox 10 ms, enable debounce, and |
| * finally enable tp mode. |
| */ |
| writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1), |
| ts->base + TP_CTRL1); |
| |
| hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts", |
| ts, sun4i_ts_groups); |
| if (IS_ERR(hwmon)) |
| return PTR_ERR(hwmon); |
| |
| writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); |
| |
| if (ts_attached) { |
| error = input_register_device(ts->input); |
| if (error) { |
| writel(0, ts->base + TP_INT_FIFOC); |
| return error; |
| } |
| } |
| |
| platform_set_drvdata(pdev, ts); |
| return 0; |
| } |
| |
| static int sun4i_ts_remove(struct platform_device *pdev) |
| { |
| struct sun4i_ts_data *ts = platform_get_drvdata(pdev); |
| |
| /* Explicit unregister to avoid open/close changing the imask later */ |
| if (ts->input) |
| input_unregister_device(ts->input); |
| |
| /* Deactivate all IRQs */ |
| writel(0, ts->base + TP_INT_FIFOC); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id sun4i_ts_of_match[] = { |
| { .compatible = "allwinner,sun4i-a10-ts", }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, sun4i_ts_of_match); |
| |
| static struct platform_driver sun4i_ts_driver = { |
| .driver = { |
| .name = "sun4i-ts", |
| .of_match_table = of_match_ptr(sun4i_ts_of_match), |
| }, |
| .probe = sun4i_ts_probe, |
| .remove = sun4i_ts_remove, |
| }; |
| |
| module_platform_driver(sun4i_ts_driver); |
| |
| MODULE_DESCRIPTION("Allwinner sun4i resistive touchscreen controller driver"); |
| MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); |
| MODULE_LICENSE("GPL"); |