target/linux/brcm2708/patches-4.19/950-0061-rpi-ft5406-Add-touchscreen-driver-for-pi-LCD-display.patch

   1 From adc948965c7c2c52df7c93acffe5bd1d71dce462 Mon Sep 17 00:00:00 2001
   2 From: Gordon Hollingworth <gordon@raspberrypi.org>
   3 Date: Tue, 12 May 2015 14:47:56 +0100
   4 Subject: [PATCH 061/703] rpi-ft5406: Add touchscreen driver for pi LCD display
   5
   6 Fix driver detection failure Check that the buffer response is non-zero meaning the touchscreen was detected
   7
   8 rpi-ft5406: Use firmware API
   9
  10 RPI-FT5406: Enable aarch64 support through explicit iomem interface
  11
  12 Signed-off-by: Gerhard de Clercq <gerharddeclercq@outlook.com>
  13 ---
  14  drivers/input/touchscreen/Kconfig      |   7 +
  15  drivers/input/touchscreen/Makefile     |   1 +
  16  drivers/input/touchscreen/rpi-ft5406.c | 292 +++++++++++++++++++++++++
  17  3 files changed, 300 insertions(+)
  18  create mode 100644 drivers/input/touchscreen/rpi-ft5406.c
  19
  20 --- a/drivers/input/touchscreen/Kconfig
  21 +++ b/drivers/input/touchscreen/Kconfig
  22 @@ -696,6 +696,13 @@ config TOUCHSCREEN_EDT_FT5X06
  23           To compile this driver as a module, choose M here: the
  24           module will be called edt-ft5x06.
  25
  26 +config TOUCHSCREEN_RPI_FT5406
  27 +       tristate "Raspberry Pi FT5406 driver"
  28 +       depends on RASPBERRYPI_FIRMWARE
  29 +       help
  30 +         Say Y here to enable the Raspberry Pi memory based FT5406 device
  31 +
  32 +
  33  config TOUCHSCREEN_MIGOR
  34         tristate "Renesas MIGO-R touchscreen"
  35         depends on (SH_MIGOR || COMPILE_TEST) && I2C
  36 --- a/drivers/input/touchscreen/Makefile
  37 +++ b/drivers/input/touchscreen/Makefile
  38 @@ -33,6 +33,7 @@ obj-$(CONFIG_TOUCHSCREEN_DA9034)      += da90
  39  obj-$(CONFIG_TOUCHSCREEN_DA9052)       += da9052_tsi.o
  40  obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)      += dynapro.o
  41  obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06)   += edt-ft5x06.o
  42 +obj-$(CONFIG_TOUCHSCREEN_RPI_FT5406)   += rpi-ft5406.o
  43  obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)    += hampshire.o
  44  obj-$(CONFIG_TOUCHSCREEN_GUNZE)                += gunze.o
  45  obj-$(CONFIG_TOUCHSCREEN_EETI)         += eeti_ts.o
  46 --- /dev/null
  47 +++ b/drivers/input/touchscreen/rpi-ft5406.c
  48 @@ -0,0 +1,292 @@
  49 +/*
  50 + * Driver for memory based ft5406 touchscreen
  51 + *
  52 + * Copyright (C) 2015 Raspberry Pi
  53 + *
  54 + *
  55 + * This program is free software; you can redistribute it and/or modify
  56 + * it under the terms of the GNU General Public License version 2 as
  57 + * published by the Free Software Foundation.
  58 + */
  59 +
  60 +
  61 +#include <linux/module.h>
  62 +#include <linux/interrupt.h>
  63 +#include <linux/input.h>
  64 +#include <linux/irq.h>
  65 +#include <linux/delay.h>
  66 +#include <linux/slab.h>
  67 +#include <linux/bitops.h>
  68 +#include <linux/input/mt.h>
  69 +#include <linux/kthread.h>
  70 +#include <linux/platform_device.h>
  71 +#include <linux/stddef.h>
  72 +#include <asm/io.h>
  73 +#include <linux/dma-mapping.h>
  74 +#include <soc/bcm2835/raspberrypi-firmware.h>
  75 +
  76 +#define MAXIMUM_SUPPORTED_POINTS 10
  77 +struct ft5406_regs {
  78 +       uint8_t device_mode;
  79 +       uint8_t gesture_id;
  80 +       uint8_t num_points;
  81 +       struct ft5406_touch {
  82 +               uint8_t xh;
  83 +               uint8_t xl;
  84 +               uint8_t yh;
  85 +               uint8_t yl;
  86 +               uint8_t res1;
  87 +               uint8_t res2;
  88 +       } point[MAXIMUM_SUPPORTED_POINTS];
  89 +};
  90 +
  91 +#define SCREEN_WIDTH  800
  92 +#define SCREEN_HEIGHT 480
  93 +
  94 +struct ft5406 {
  95 +       struct platform_device * pdev;
  96 +       struct input_dev       * input_dev;
  97 +       void __iomem           * ts_base;
  98 +       dma_addr_t               bus_addr;
  99 +       struct task_struct     * thread;
 100 +};
 101 +
 102 +/* Thread to poll for touchscreen events
 103 + *
 104 + * This thread polls the memory based register copy of the ft5406 registers
 105 + * using the number of points register to know whether the copy has been
 106 + * updated (we write 99 to the memory copy, the GPU will write between
 107 + * 0 - 10 points)
 108 + */
 109 +static int ft5406_thread(void *arg)
 110 +{
 111 +       struct ft5406 *ts = (struct ft5406 *) arg;
 112 +       struct ft5406_regs regs;
 113 +       int known_ids = 0;
 114 +
 115 +       while(!kthread_should_stop())
 116 +       {
 117 +               // 60fps polling
 118 +               msleep_interruptible(17);
 119 +               memcpy_fromio(&regs, ts->ts_base, sizeof(struct ft5406_regs));
 120 +               iowrite8(99, ts->ts_base + offsetof(struct ft5406_regs, num_points));
 121 +               // Do not output if theres no new information (num_points is 99)
 122 +               // or we have no touch points and don't need to release any
 123 +               if(!(regs.num_points == 99 || (regs.num_points == 0 && known_ids == 0)))
 124 +               {
 125 +                       int i;
 126 +                       int modified_ids = 0, released_ids;
 127 +                       for(i = 0; i < regs.num_points; i++)
 128 +                       {
 129 +                               int x = (((int) regs.point[i].xh & 0xf) << 8) + regs.point[i].xl;
 130 +                               int y = (((int) regs.point[i].yh & 0xf) << 8) + regs.point[i].yl;
 131 +                               int touchid = (regs.point[i].yh >> 4) & 0xf;
 132 +
 133 +                               modified_ids |= 1 << touchid;
 134 +
 135 +                               if(!((1 << touchid) & known_ids))
 136 +                                       dev_dbg(&ts->pdev->dev, "x = %d, y = %d, touchid = %d\n", x, y, touchid);
 137 +
 138 +                               input_mt_slot(ts->input_dev, touchid);
 139 +                               input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 1);
 140 +
 141 +                               input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x);
 142 +                               input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y);
 143 +
 144 +                       }
 145 +
 146 +                       released_ids = known_ids & ~modified_ids;
 147 +                       for(i = 0; released_ids && i < MAXIMUM_SUPPORTED_POINTS; i++)
 148 +                       {
 149 +                               if(released_ids & (1<<i))
 150 +                               {
 151 +                                       dev_dbg(&ts->pdev->dev, "Released %d, known = %x modified = %x\n", i, known_ids, modified_ids);
 152 +                                       input_mt_slot(ts->input_dev, i);
 153 +                                       input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 0);
 154 +                                       modified_ids &= ~(1 << i);
 155 +                               }
 156 +                       }
 157 +                       known_ids = modified_ids;
 158 +
 159 +                       input_mt_report_pointer_emulation(ts->input_dev, true);
 160 +                       input_sync(ts->input_dev);
 161 +               }
 162 +
 163 +       }
 164 +
 165 +       return 0;
 166 +}
 167 +
 168 +static int ft5406_probe(struct platform_device *pdev)
 169 +{
 170 +       int err = 0;
 171 +       struct device *dev = &pdev->dev;
 172 +       struct device_node *np = dev->of_node;
 173 +       struct ft5406 * ts;
 174 +       struct device_node *fw_node;
 175 +       struct rpi_firmware *fw;
 176 +       u32 touchbuf;
 177 +
 178 +       dev_info(dev, "Probing device\n");
 179 +
 180 +       fw_node = of_parse_phandle(np, "firmware", 0);
 181 +       if (!fw_node) {
 182 +               dev_err(dev, "Missing firmware node\n");
 183 +               return -ENOENT;
 184 +       }
 185 +
 186 +       fw = rpi_firmware_get(fw_node);
 187 +       if (!fw)
 188 +               return -EPROBE_DEFER;
 189 +
 190 +       ts = devm_kzalloc(dev, sizeof(struct ft5406), GFP_KERNEL);
 191 +       if (!ts) {
 192 +               dev_err(dev, "Failed to allocate memory\n");
 193 +               return -ENOMEM;
 194 +       }
 195 +
 196 +       ts->input_dev = input_allocate_device();
 197 +       if (!ts->input_dev) {
 198 +               dev_err(dev, "Failed to allocate input device\n");
 199 +               return -ENOMEM;
 200 +       }
 201 +
 202 +       ts->ts_base = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->bus_addr, GFP_KERNEL);
 203 +       if (!ts->ts_base) {
 204 +               pr_err("[%s]: failed to dma_alloc_coherent(%ld)\n",
 205 +                               __func__, PAGE_SIZE);
 206 +               err = -ENOMEM;
 207 +               goto out;
 208 +       }
 209 +
 210 +       touchbuf = (u32)ts->bus_addr;
 211 +       err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
 212 +                                   &touchbuf, sizeof(touchbuf));
 213 +
 214 +       if (err || touchbuf != 0) {
 215 +               dev_warn(dev, "Failed to set touchbuf, trying to get err:%x\n", err);
 216 +               dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
 217 +               ts->ts_base = 0;
 218 +               ts->bus_addr = 0;
 219 +       }
 220 +
 221 +       if (!ts->ts_base) {
 222 +               dev_warn(dev, "set failed, trying get (err:%d touchbuf:%x virt:%p bus:%x)\n", err, touchbuf, ts->ts_base, ts->bus_addr);
 223 +
 224 +               err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF,
 225 +                                   &touchbuf, sizeof(touchbuf));
 226 +               if (err) {
 227 +                       dev_err(dev, "Failed to get touch buffer\n");
 228 +                       goto out;
 229 +               }
 230 +
 231 +               if (!touchbuf) {
 232 +                       dev_err(dev, "Touchscreen not detected\n");
 233 +                       err = -ENODEV;
 234 +                       goto out;
 235 +               }
 236 +
 237 +               dev_dbg(dev, "Got TS buffer 0x%x\n", touchbuf);
 238 +
 239 +               // mmap the physical memory
 240 +               touchbuf &= ~0xc0000000;
 241 +               ts->ts_base = ioremap(touchbuf, sizeof(struct ft5406_regs));
 242 +               if (ts->ts_base == NULL)
 243 +               {
 244 +                       dev_err(dev, "Failed to map physical address\n");
 245 +                       err = -ENOMEM;
 246 +                       goto out;
 247 +               }
 248 +       }
 249 +       platform_set_drvdata(pdev, ts);
 250 +       ts->pdev = pdev;
 251 +
 252 +       ts->input_dev->name = "FT5406 memory based driver";
 253 +
 254 +       __set_bit(EV_KEY, ts->input_dev->evbit);
 255 +       __set_bit(EV_SYN, ts->input_dev->evbit);
 256 +       __set_bit(EV_ABS, ts->input_dev->evbit);
 257 +
 258 +       input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X, 0,
 259 +                            SCREEN_WIDTH, 0, 0);
 260 +       input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, 0,
 261 +                            SCREEN_HEIGHT, 0, 0);
 262 +
 263 +       input_mt_init_slots(ts->input_dev, MAXIMUM_SUPPORTED_POINTS, INPUT_MT_DIRECT);
 264 +
 265 +       input_set_drvdata(ts->input_dev, ts);
 266 +
 267 +       err = input_register_device(ts->input_dev);
 268 +       if (err) {
 269 +               dev_err(dev, "could not register input device, %d\n",
 270 +                       err);
 271 +               goto out;
 272 +       }
 273 +
 274 +       // create thread to poll the touch events
 275 +       ts->thread = kthread_run(ft5406_thread, ts, "ft5406");
 276 +       if(ts->thread == NULL)
 277 +       {
 278 +               dev_err(dev, "Failed to create kernel thread");
 279 +               err = -ENOMEM;
 280 +               goto out;
 281 +       }
 282 +
 283 +       return 0;
 284 +
 285 +out:
 286 +       if (ts->bus_addr) {
 287 +               dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
 288 +               ts->bus_addr = 0;
 289 +               ts->ts_base = NULL;
 290 +       } else if (ts->ts_base) {
 291 +               iounmap(ts->ts_base);
 292 +               ts->ts_base = NULL;
 293 +       }
 294 +       if (ts->input_dev) {
 295 +               input_unregister_device(ts->input_dev);
 296 +               ts->input_dev = NULL;
 297 +       }
 298 +       return err;
 299 +}
 300 +
 301 +static int ft5406_remove(struct platform_device *pdev)
 302 +{
 303 +       struct device *dev = &pdev->dev;
 304 +       struct ft5406 *ts = (struct ft5406 *) platform_get_drvdata(pdev);
 305 +
 306 +       dev_info(dev, "Removing rpi-ft5406\n");
 307 +
 308 +       kthread_stop(ts->thread);
 309 +
 310 +       if (ts->bus_addr)
 311 +               dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
 312 +       else if (ts->ts_base)
 313 +               iounmap(ts->ts_base);
 314 +       if (ts->input_dev)
 315 +               input_unregister_device(ts->input_dev);
 316 +
 317 +       return 0;
 318 +}
 319 +
 320 +static const struct of_device_id ft5406_match[] = {
 321 +       { .compatible = "rpi,rpi-ft5406", },
 322 +       {},
 323 +};
 324 +MODULE_DEVICE_TABLE(of, ft5406_match);
 325 +
 326 +static struct platform_driver ft5406_driver = {
 327 +       .driver = {
 328 +               .name   = "rpi-ft5406",
 329 +               .owner  = THIS_MODULE,
 330 +               .of_match_table = ft5406_match,
 331 +       },
 332 +       .probe          = ft5406_probe,
 333 +       .remove         = ft5406_remove,
 334 +};
 335 +
 336 +module_platform_driver(ft5406_driver);
 337 +
 338 +MODULE_AUTHOR("Gordon Hollingworth");
 339 +MODULE_DESCRIPTION("Touchscreen driver for memory based FT5406");
 340 +MODULE_LICENSE("GPL");