16decea7cSHans de Goede /* 26decea7cSHans de Goede * Allwinner sunxi resistive touchscreen controller driver 36decea7cSHans de Goede * 46decea7cSHans de Goede * Copyright (C) 2013 - 2014 Hans de Goede <hdegoede@redhat.com> 56decea7cSHans de Goede * 6f09f98d3SHans de Goede * The hwmon parts are based on work by Corentin LABBE which is: 7f09f98d3SHans de Goede * Copyright (C) 2013 Corentin LABBE <clabbe.montjoie@gmail.com> 8f09f98d3SHans de Goede * 96decea7cSHans de Goede * This program is free software; you can redistribute it and/or modify 106decea7cSHans de Goede * it under the terms of the GNU General Public License as published by 116decea7cSHans de Goede * the Free Software Foundation; either version 2 of the License, or 126decea7cSHans de Goede * (at your option) any later version. 136decea7cSHans de Goede * 146decea7cSHans de Goede * This program is distributed in the hope that it will be useful, 156decea7cSHans de Goede * but WITHOUT ANY WARRANTY; without even the implied warranty of 166decea7cSHans de Goede * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 176decea7cSHans de Goede * GNU General Public License for more details. 186decea7cSHans de Goede */ 196decea7cSHans de Goede 206decea7cSHans de Goede /* 216decea7cSHans de Goede * The sun4i-ts controller is capable of detecting a second touch, but when a 226decea7cSHans de Goede * second touch is present then the accuracy becomes so bad the reported touch 236decea7cSHans de Goede * location is not useable. 246decea7cSHans de Goede * 256decea7cSHans de Goede * The original android driver contains some complicated heuristics using the 266decea7cSHans de Goede * aprox. distance between the 2 touches to see if the user is making a pinch 276decea7cSHans de Goede * open / close movement, and then reports emulated multi-touch events around 286decea7cSHans de Goede * the last touch coordinate (as the dual-touch coordinates are worthless). 296decea7cSHans de Goede * 306decea7cSHans de Goede * These kinds of heuristics are just asking for trouble (and don't belong 316decea7cSHans de Goede * in the kernel). So this driver offers straight forward, reliable single 326decea7cSHans de Goede * touch functionality only. 336decea7cSHans de Goede */ 346decea7cSHans de Goede 356decea7cSHans de Goede #include <linux/err.h> 36f09f98d3SHans de Goede #include <linux/hwmon.h> 376decea7cSHans de Goede #include <linux/init.h> 386decea7cSHans de Goede #include <linux/input.h> 396decea7cSHans de Goede #include <linux/interrupt.h> 406decea7cSHans de Goede #include <linux/io.h> 416decea7cSHans de Goede #include <linux/module.h> 426decea7cSHans de Goede #include <linux/of_platform.h> 436decea7cSHans de Goede #include <linux/platform_device.h> 446decea7cSHans de Goede #include <linux/slab.h> 456decea7cSHans de Goede 466decea7cSHans de Goede #define TP_CTRL0 0x00 476decea7cSHans de Goede #define TP_CTRL1 0x04 486decea7cSHans de Goede #define TP_CTRL2 0x08 496decea7cSHans de Goede #define TP_CTRL3 0x0c 506decea7cSHans de Goede #define TP_INT_FIFOC 0x10 516decea7cSHans de Goede #define TP_INT_FIFOS 0x14 526decea7cSHans de Goede #define TP_TPR 0x18 536decea7cSHans de Goede #define TP_CDAT 0x1c 546decea7cSHans de Goede #define TEMP_DATA 0x20 556decea7cSHans de Goede #define TP_DATA 0x24 566decea7cSHans de Goede 576decea7cSHans de Goede /* TP_CTRL0 bits */ 586decea7cSHans de Goede #define ADC_FIRST_DLY(x) ((x) << 24) /* 8 bits */ 596decea7cSHans de Goede #define ADC_FIRST_DLY_MODE(x) ((x) << 23) 606decea7cSHans de Goede #define ADC_CLK_SEL(x) ((x) << 22) 616decea7cSHans de Goede #define ADC_CLK_DIV(x) ((x) << 20) /* 3 bits */ 626decea7cSHans de Goede #define FS_DIV(x) ((x) << 16) /* 4 bits */ 636decea7cSHans de Goede #define T_ACQ(x) ((x) << 0) /* 16 bits */ 646decea7cSHans de Goede 656decea7cSHans de Goede /* TP_CTRL1 bits */ 666decea7cSHans de Goede #define STYLUS_UP_DEBOUN(x) ((x) << 12) /* 8 bits */ 676decea7cSHans de Goede #define STYLUS_UP_DEBOUN_EN(x) ((x) << 9) 686decea7cSHans de Goede #define TOUCH_PAN_CALI_EN(x) ((x) << 6) 696decea7cSHans de Goede #define TP_DUAL_EN(x) ((x) << 5) 706decea7cSHans de Goede #define TP_MODE_EN(x) ((x) << 4) 716decea7cSHans de Goede #define TP_ADC_SELECT(x) ((x) << 3) 726decea7cSHans de Goede #define ADC_CHAN_SELECT(x) ((x) << 0) /* 3 bits */ 736decea7cSHans de Goede 746decea7cSHans de Goede /* TP_CTRL2 bits */ 756decea7cSHans de Goede #define TP_SENSITIVE_ADJUST(x) ((x) << 28) /* 4 bits */ 766decea7cSHans de Goede #define TP_MODE_SELECT(x) ((x) << 26) /* 2 bits */ 776decea7cSHans de Goede #define PRE_MEA_EN(x) ((x) << 24) 786decea7cSHans de Goede #define PRE_MEA_THRE_CNT(x) ((x) << 0) /* 24 bits */ 796decea7cSHans de Goede 806decea7cSHans de Goede /* TP_CTRL3 bits */ 816decea7cSHans de Goede #define FILTER_EN(x) ((x) << 2) 826decea7cSHans de Goede #define FILTER_TYPE(x) ((x) << 0) /* 2 bits */ 836decea7cSHans de Goede 846decea7cSHans de Goede /* TP_INT_FIFOC irq and fifo mask / control bits */ 856decea7cSHans de Goede #define TEMP_IRQ_EN(x) ((x) << 18) 866decea7cSHans de Goede #define OVERRUN_IRQ_EN(x) ((x) << 17) 876decea7cSHans de Goede #define DATA_IRQ_EN(x) ((x) << 16) 886decea7cSHans de Goede #define TP_DATA_XY_CHANGE(x) ((x) << 13) 896decea7cSHans de Goede #define FIFO_TRIG(x) ((x) << 8) /* 5 bits */ 906decea7cSHans de Goede #define DATA_DRQ_EN(x) ((x) << 7) 916decea7cSHans de Goede #define FIFO_FLUSH(x) ((x) << 4) 926decea7cSHans de Goede #define TP_UP_IRQ_EN(x) ((x) << 1) 936decea7cSHans de Goede #define TP_DOWN_IRQ_EN(x) ((x) << 0) 946decea7cSHans de Goede 956decea7cSHans de Goede /* TP_INT_FIFOS irq and fifo status bits */ 966decea7cSHans de Goede #define TEMP_DATA_PENDING BIT(18) 976decea7cSHans de Goede #define FIFO_OVERRUN_PENDING BIT(17) 986decea7cSHans de Goede #define FIFO_DATA_PENDING BIT(16) 996decea7cSHans de Goede #define TP_IDLE_FLG BIT(2) 1006decea7cSHans de Goede #define TP_UP_PENDING BIT(1) 1016decea7cSHans de Goede #define TP_DOWN_PENDING BIT(0) 1026decea7cSHans de Goede 1036decea7cSHans de Goede /* TP_TPR bits */ 1046decea7cSHans de Goede #define TEMP_ENABLE(x) ((x) << 16) 1056decea7cSHans de Goede #define TEMP_PERIOD(x) ((x) << 0) /* t = x * 256 * 16 / clkin */ 1066decea7cSHans de Goede 1076decea7cSHans de Goede struct sun4i_ts_data { 1086decea7cSHans de Goede struct device *dev; 1096decea7cSHans de Goede struct input_dev *input; 1106decea7cSHans de Goede void __iomem *base; 1116decea7cSHans de Goede unsigned int irq; 1126decea7cSHans de Goede bool ignore_fifo_data; 113f09f98d3SHans de Goede int temp_data; 1146decea7cSHans de Goede }; 1156decea7cSHans de Goede 116f09f98d3SHans de Goede static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val) 1176decea7cSHans de Goede { 118f09f98d3SHans de Goede u32 x, y; 1196decea7cSHans de Goede 1206decea7cSHans de Goede if (reg_val & FIFO_DATA_PENDING) { 1216decea7cSHans de Goede x = readl(ts->base + TP_DATA); 1226decea7cSHans de Goede y = readl(ts->base + TP_DATA); 1236decea7cSHans de Goede /* The 1st location reported after an up event is unreliable */ 1246decea7cSHans de Goede if (!ts->ignore_fifo_data) { 1256decea7cSHans de Goede input_report_abs(ts->input, ABS_X, x); 1266decea7cSHans de Goede input_report_abs(ts->input, ABS_Y, y); 1276decea7cSHans de Goede /* 1286decea7cSHans de Goede * The hardware has a separate down status bit, but 1296decea7cSHans de Goede * that gets set before we get the first location, 1306decea7cSHans de Goede * resulting in reporting a click on the old location. 1316decea7cSHans de Goede */ 1326decea7cSHans de Goede input_report_key(ts->input, BTN_TOUCH, 1); 1336decea7cSHans de Goede input_sync(ts->input); 1346decea7cSHans de Goede } else { 1356decea7cSHans de Goede ts->ignore_fifo_data = false; 1366decea7cSHans de Goede } 1376decea7cSHans de Goede } 1386decea7cSHans de Goede 1396decea7cSHans de Goede if (reg_val & TP_UP_PENDING) { 1406decea7cSHans de Goede ts->ignore_fifo_data = true; 1416decea7cSHans de Goede input_report_key(ts->input, BTN_TOUCH, 0); 1426decea7cSHans de Goede input_sync(ts->input); 1436decea7cSHans de Goede } 144f09f98d3SHans de Goede } 145f09f98d3SHans de Goede 146f09f98d3SHans de Goede static irqreturn_t sun4i_ts_irq(int irq, void *dev_id) 147f09f98d3SHans de Goede { 148f09f98d3SHans de Goede struct sun4i_ts_data *ts = dev_id; 149f09f98d3SHans de Goede u32 reg_val; 150f09f98d3SHans de Goede 151f09f98d3SHans de Goede reg_val = readl(ts->base + TP_INT_FIFOS); 152f09f98d3SHans de Goede 153f09f98d3SHans de Goede if (reg_val & TEMP_DATA_PENDING) 154f09f98d3SHans de Goede ts->temp_data = readl(ts->base + TEMP_DATA); 155f09f98d3SHans de Goede 156f09f98d3SHans de Goede if (ts->input) 157f09f98d3SHans de Goede sun4i_ts_irq_handle_input(ts, reg_val); 1586decea7cSHans de Goede 1596decea7cSHans de Goede writel(reg_val, ts->base + TP_INT_FIFOS); 1606decea7cSHans de Goede 1616decea7cSHans de Goede return IRQ_HANDLED; 1626decea7cSHans de Goede } 1636decea7cSHans de Goede 1646decea7cSHans de Goede static int sun4i_ts_open(struct input_dev *dev) 1656decea7cSHans de Goede { 1666decea7cSHans de Goede struct sun4i_ts_data *ts = input_get_drvdata(dev); 1676decea7cSHans de Goede 168f09f98d3SHans de Goede /* Flush, set trig level to 1, enable temp, data and up irqs */ 169f09f98d3SHans de Goede writel(TEMP_IRQ_EN(1) | DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | 170f09f98d3SHans de Goede TP_UP_IRQ_EN(1), ts->base + TP_INT_FIFOC); 1716decea7cSHans de Goede 1726decea7cSHans de Goede return 0; 1736decea7cSHans de Goede } 1746decea7cSHans de Goede 1756decea7cSHans de Goede static void sun4i_ts_close(struct input_dev *dev) 1766decea7cSHans de Goede { 1776decea7cSHans de Goede struct sun4i_ts_data *ts = input_get_drvdata(dev); 1786decea7cSHans de Goede 179f09f98d3SHans de Goede /* Deactivate all input IRQs */ 180f09f98d3SHans de Goede writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); 1816decea7cSHans de Goede } 1826decea7cSHans de Goede 183f09f98d3SHans de Goede static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, 184f09f98d3SHans de Goede char *buf) 185f09f98d3SHans de Goede { 186f09f98d3SHans de Goede struct sun4i_ts_data *ts = dev_get_drvdata(dev); 187f09f98d3SHans de Goede 188f09f98d3SHans de Goede /* No temp_data until the first irq */ 189f09f98d3SHans de Goede if (ts->temp_data == -1) 190f09f98d3SHans de Goede return -EAGAIN; 191f09f98d3SHans de Goede 192f09f98d3SHans de Goede return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100); 193f09f98d3SHans de Goede } 194f09f98d3SHans de Goede 195f09f98d3SHans de Goede static ssize_t show_temp_label(struct device *dev, 196f09f98d3SHans de Goede struct device_attribute *devattr, char *buf) 197f09f98d3SHans de Goede { 198f09f98d3SHans de Goede return sprintf(buf, "SoC temperature\n"); 199f09f98d3SHans de Goede } 200f09f98d3SHans de Goede 201f09f98d3SHans de Goede static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 202f09f98d3SHans de Goede static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL); 203f09f98d3SHans de Goede 204f09f98d3SHans de Goede static struct attribute *sun4i_ts_attrs[] = { 205f09f98d3SHans de Goede &dev_attr_temp1_input.attr, 206f09f98d3SHans de Goede &dev_attr_temp1_label.attr, 207f09f98d3SHans de Goede NULL 208f09f98d3SHans de Goede }; 209f09f98d3SHans de Goede ATTRIBUTE_GROUPS(sun4i_ts); 210f09f98d3SHans de Goede 2116decea7cSHans de Goede static int sun4i_ts_probe(struct platform_device *pdev) 2126decea7cSHans de Goede { 2136decea7cSHans de Goede struct sun4i_ts_data *ts; 2146decea7cSHans de Goede struct device *dev = &pdev->dev; 215f09f98d3SHans de Goede struct device_node *np = dev->of_node; 216f09f98d3SHans de Goede struct device *hwmon; 2176decea7cSHans de Goede int error; 218f09f98d3SHans de Goede bool ts_attached; 2196decea7cSHans de Goede 2206decea7cSHans de Goede ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL); 2216decea7cSHans de Goede if (!ts) 2226decea7cSHans de Goede return -ENOMEM; 2236decea7cSHans de Goede 2246decea7cSHans de Goede ts->dev = dev; 2256decea7cSHans de Goede ts->ignore_fifo_data = true; 226f09f98d3SHans de Goede ts->temp_data = -1; 2276decea7cSHans de Goede 228f09f98d3SHans de Goede ts_attached = of_property_read_bool(np, "allwinner,ts-attached"); 229f09f98d3SHans de Goede if (ts_attached) { 2306decea7cSHans de Goede ts->input = devm_input_allocate_device(dev); 2316decea7cSHans de Goede if (!ts->input) 2326decea7cSHans de Goede return -ENOMEM; 2336decea7cSHans de Goede 2346decea7cSHans de Goede ts->input->name = pdev->name; 2356decea7cSHans de Goede ts->input->phys = "sun4i_ts/input0"; 2366decea7cSHans de Goede ts->input->open = sun4i_ts_open; 2376decea7cSHans de Goede ts->input->close = sun4i_ts_close; 2386decea7cSHans de Goede ts->input->id.bustype = BUS_HOST; 2396decea7cSHans de Goede ts->input->id.vendor = 0x0001; 2406decea7cSHans de Goede ts->input->id.product = 0x0001; 2416decea7cSHans de Goede ts->input->id.version = 0x0100; 2426decea7cSHans de Goede ts->input->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS); 2436decea7cSHans de Goede __set_bit(BTN_TOUCH, ts->input->keybit); 2446decea7cSHans de Goede input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0); 2456decea7cSHans de Goede input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0); 2466decea7cSHans de Goede input_set_drvdata(ts->input, ts); 247f09f98d3SHans de Goede } 2486decea7cSHans de Goede 2496decea7cSHans de Goede ts->base = devm_ioremap_resource(dev, 2506decea7cSHans de Goede platform_get_resource(pdev, IORESOURCE_MEM, 0)); 2516decea7cSHans de Goede if (IS_ERR(ts->base)) 2526decea7cSHans de Goede return PTR_ERR(ts->base); 2536decea7cSHans de Goede 2546decea7cSHans de Goede ts->irq = platform_get_irq(pdev, 0); 2556decea7cSHans de Goede error = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts); 2566decea7cSHans de Goede if (error) 2576decea7cSHans de Goede return error; 2586decea7cSHans de Goede 2596decea7cSHans de Goede /* 2606decea7cSHans de Goede * Select HOSC clk, clkin = clk / 6, adc samplefreq = clkin / 8192, 2616decea7cSHans de Goede * t_acq = clkin / (16 * 64) 2626decea7cSHans de Goede */ 2636decea7cSHans de Goede writel(ADC_CLK_SEL(0) | ADC_CLK_DIV(2) | FS_DIV(7) | T_ACQ(63), 2646decea7cSHans de Goede ts->base + TP_CTRL0); 2656decea7cSHans de Goede 2666decea7cSHans de Goede /* 2676decea7cSHans de Goede * sensitive_adjust = 15 : max, which is not all that sensitive, 2686decea7cSHans de Goede * tp_mode = 0 : only x and y coordinates, as we don't use dual touch 2696decea7cSHans de Goede */ 2706decea7cSHans de Goede writel(TP_SENSITIVE_ADJUST(15) | TP_MODE_SELECT(0), 2716decea7cSHans de Goede ts->base + TP_CTRL2); 2726decea7cSHans de Goede 2736decea7cSHans de Goede /* Enable median filter, type 1 : 5/3 */ 2746decea7cSHans de Goede writel(FILTER_EN(1) | FILTER_TYPE(1), ts->base + TP_CTRL3); 2756decea7cSHans de Goede 2766decea7cSHans de Goede /* Enable temperature measurement, period 1953 (2 seconds) */ 2776decea7cSHans de Goede writel(TEMP_ENABLE(1) | TEMP_PERIOD(1953), ts->base + TP_TPR); 2786decea7cSHans de Goede 2796decea7cSHans de Goede /* 2806decea7cSHans de Goede * Set stylus up debounce to aprox 10 ms, enable debounce, and 2816decea7cSHans de Goede * finally enable tp mode. 2826decea7cSHans de Goede */ 2836decea7cSHans de Goede writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1), 2846decea7cSHans de Goede ts->base + TP_CTRL1); 2856decea7cSHans de Goede 286f09f98d3SHans de Goede hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts", 287f09f98d3SHans de Goede ts, sun4i_ts_groups); 288f09f98d3SHans de Goede if (IS_ERR(hwmon)) 289f09f98d3SHans de Goede return PTR_ERR(hwmon); 290f09f98d3SHans de Goede 291f09f98d3SHans de Goede writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); 292f09f98d3SHans de Goede 293f09f98d3SHans de Goede if (ts_attached) { 2946decea7cSHans de Goede error = input_register_device(ts->input); 295f09f98d3SHans de Goede if (error) { 296f09f98d3SHans de Goede writel(0, ts->base + TP_INT_FIFOC); 2976decea7cSHans de Goede return error; 298f09f98d3SHans de Goede } 299f09f98d3SHans de Goede } 3006decea7cSHans de Goede 3016decea7cSHans de Goede platform_set_drvdata(pdev, ts); 3026decea7cSHans de Goede return 0; 3036decea7cSHans de Goede } 3046decea7cSHans de Goede 305f09f98d3SHans de Goede static int sun4i_ts_remove(struct platform_device *pdev) 306f09f98d3SHans de Goede { 307f09f98d3SHans de Goede struct sun4i_ts_data *ts = platform_get_drvdata(pdev); 308f09f98d3SHans de Goede 309f09f98d3SHans de Goede /* Explicit unregister to avoid open/close changing the imask later */ 310f09f98d3SHans de Goede if (ts->input) 311f09f98d3SHans de Goede input_unregister_device(ts->input); 312f09f98d3SHans de Goede 313f09f98d3SHans de Goede /* Deactivate all IRQs */ 314f09f98d3SHans de Goede writel(0, ts->base + TP_INT_FIFOC); 315f09f98d3SHans de Goede 316f09f98d3SHans de Goede return 0; 317f09f98d3SHans de Goede } 318f09f98d3SHans de Goede 3196decea7cSHans de Goede static const struct of_device_id sun4i_ts_of_match[] = { 3206decea7cSHans de Goede { .compatible = "allwinner,sun4i-a10-ts", }, 3216decea7cSHans de Goede { /* sentinel */ } 3226decea7cSHans de Goede }; 3236decea7cSHans de Goede MODULE_DEVICE_TABLE(of, sun4i_ts_of_match); 3246decea7cSHans de Goede 3256decea7cSHans de Goede static struct platform_driver sun4i_ts_driver = { 3266decea7cSHans de Goede .driver = { 3276decea7cSHans de Goede .owner = THIS_MODULE, 3286decea7cSHans de Goede .name = "sun4i-ts", 3296decea7cSHans de Goede .of_match_table = of_match_ptr(sun4i_ts_of_match), 3306decea7cSHans de Goede }, 3316decea7cSHans de Goede .probe = sun4i_ts_probe, 332f09f98d3SHans de Goede .remove = sun4i_ts_remove, 3336decea7cSHans de Goede }; 3346decea7cSHans de Goede 3356decea7cSHans de Goede module_platform_driver(sun4i_ts_driver); 3366decea7cSHans de Goede 3376decea7cSHans de Goede MODULE_DESCRIPTION("Allwinner sun4i resistive touchscreen controller driver"); 3386decea7cSHans de Goede MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 3396decea7cSHans de Goede MODULE_LICENSE("GPL"); 340