target/linux/brcm2708/patches-4.9/0062-rpi-ft5406-Add-touchscreen-driver-for-pi-LCD-display.patch

   1 From 18c740925ca44b8a2f55ac201acf935f9fa97515 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] 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  include/soc/bcm2835/raspberrypi-firmware.h |   1 +
  18  4 files changed, 301 insertions(+)
  19  create mode 100644 drivers/input/touchscreen/rpi-ft5406.c
  20
  21 --- a/drivers/input/touchscreen/Kconfig
  22 +++ b/drivers/input/touchscreen/Kconfig
  23 @@ -638,6 +638,13 @@ config TOUCHSCREEN_EDT_FT5X06
  24           To compile this driver as a module, choose M here: the
  25           module will be called edt-ft5x06.
  26
  27 +config TOUCHSCREEN_RPI_FT5406
  28 +       tristate "Raspberry Pi FT5406 driver"
  29 +       depends on RASPBERRYPI_FIRMWARE
  30 +       help
  31 +         Say Y here to enable the Raspberry Pi memory based FT5406 device
  32 +
  33 +
  34  config TOUCHSCREEN_MIGOR
  35         tristate "Renesas MIGO-R touchscreen"
  36         depends on (SH_MIGOR || COMPILE_TEST) && I2C
  37 --- a/drivers/input/touchscreen/Makefile
  38 +++ b/drivers/input/touchscreen/Makefile
  39 @@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_DA9034)      += da90
  40  obj-$(CONFIG_TOUCHSCREEN_DA9052)       += da9052_tsi.o
  41  obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)      += dynapro.o
  42  obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06)   += edt-ft5x06.o
  43 +obj-$(CONFIG_TOUCHSCREEN_RPI_FT5406)   += rpi-ft5406.o
  44  obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)    += hampshire.o
  45  obj-$(CONFIG_TOUCHSCREEN_GUNZE)                += gunze.o
  46  obj-$(CONFIG_TOUCHSCREEN_EETI)         += eeti_ts.o
  47 --- /dev/null
  48 +++ b/drivers/input/touchscreen/rpi-ft5406.c
  49 @@ -0,0 +1,292 @@
  50 +/*
  51 + * Driver for memory based ft5406 touchscreen
  52 + *
  53 + * Copyright (C) 2015 Raspberry Pi
  54 + *
  55 + *
  56 + * This program is free software; you can redistribute it and/or modify
  57 + * it under the terms of the GNU General Public License version 2 as
  58 + * published by the Free Software Foundation.
  59 + */
  60 +
  61 +
  62 +#include <linux/module.h>
  63 +#include <linux/interrupt.h>
  64 +#include <linux/input.h>
  65 +#include <linux/irq.h>
  66 +#include <linux/delay.h>
  67 +#include <linux/slab.h>
  68 +#include <linux/bitops.h>
  69 +#include <linux/input/mt.h>
  70 +#include <linux/kthread.h>
  71 +#include <linux/platform_device.h>
  72 +#include <linux/stddef.h>
  73 +#include <asm/io.h>
  74 +#include <linux/dma-mapping.h>
  75 +#include <soc/bcm2835/raspberrypi-firmware.h>
  76 +
  77 +#define MAXIMUM_SUPPORTED_POINTS 10
  78 +struct ft5406_regs {
  79 +       uint8_t device_mode;
  80 +       uint8_t gesture_id;
  81 +       uint8_t num_points;
  82 +       struct ft5406_touch {
  83 +               uint8_t xh;
  84 +               uint8_t xl;
  85 +               uint8_t yh;
  86 +               uint8_t yl;
  87 +               uint8_t res1;
  88 +               uint8_t res2;
  89 +       } point[MAXIMUM_SUPPORTED_POINTS];
  90 +};
  91 +
  92 +#define SCREEN_WIDTH  800
  93 +#define SCREEN_HEIGHT 480
  94 +
  95 +struct ft5406 {
  96 +       struct platform_device * pdev;
  97 +       struct input_dev       * input_dev;
  98 +       void __iomem           * ts_base;
  99 +       dma_addr_t               bus_addr;
 100 +       struct task_struct     * thread;
 101 +};
 102 +
 103 +/* Thread to poll for touchscreen events
 104 + *
 105 + * This thread polls the memory based register copy of the ft5406 registers
 106 + * using the number of points register to know whether the copy has been
 107 + * updated (we write 99 to the memory copy, the GPU will write between
 108 + * 0 - 10 points)
 109 + */
 110 +static int ft5406_thread(void *arg)
 111 +{
 112 +       struct ft5406 *ts = (struct ft5406 *) arg;
 113 +       struct ft5406_regs regs;
 114 +       int known_ids = 0;
 115 +
 116 +       while(!kthread_should_stop())
 117 +       {
 118 +               // 60fps polling
 119 +               msleep_interruptible(17);
 120 +               memcpy_fromio(&regs, ts->ts_base, sizeof(struct ft5406_regs));
 121 +               iowrite8(99, ts->ts_base + offsetof(struct ft5406_regs, num_points));
 122 +               // Do not output if theres no new information (num_points is 99)
 123 +               // or we have no touch points and don't need to release any
 124 +               if(!(regs.num_points == 99 || (regs.num_points == 0 && known_ids == 0)))
 125 +               {
 126 +                       int i;
 127 +                       int modified_ids = 0, released_ids;
 128 +                       for(i = 0; i < regs.num_points; i++)
 129 +                       {
 130 +                               int x = (((int) regs.point[i].xh & 0xf) << 8) + regs.point[i].xl;
 131 +                               int y = (((int) regs.point[i].yh & 0xf) << 8) + regs.point[i].yl;
 132 +                               int touchid = (regs.point[i].yh >> 4) & 0xf;
 133 +
 134 +                               modified_ids |= 1 << touchid;
 135 +
 136 +                               if(!((1 << touchid) & known_ids))
 137 +                                       dev_dbg(&ts->pdev->dev, "x = %d, y = %d, touchid = %d\n", x, y, touchid);
 138 +
 139 +                               input_mt_slot(ts->input_dev, touchid);
 140 +                               input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 1);
 141 +
 142 +                               input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x);
 143 +                               input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y);
 144 +
 145 +                       }
 146 +
 147 +                       released_ids = known_ids & ~modified_ids;
 148 +                       for(i = 0; released_ids && i < MAXIMUM_SUPPORTED_POINTS; i++)
 149 +                       {
 150 +                               if(released_ids & (1<<i))
 151 +                               {
 152 +                                       dev_dbg(&ts->pdev->dev, "Released %d, known = %x modified = %x\n", i, known_ids, modified_ids);
 153 +                                       input_mt_slot(ts->input_dev, i);
 154 +                                       input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 0);
 155 +                                       modified_ids &= ~(1 << i);
 156 +                               }
 157 +                       }
 158 +                       known_ids = modified_ids;
 159 +
 160 +                       input_mt_report_pointer_emulation(ts->input_dev, true);
 161 +                       input_sync(ts->input_dev);
 162 +               }
 163 +
 164 +       }
 165 +
 166 +       return 0;
 167 +}
 168 +
 169 +static int ft5406_probe(struct platform_device *pdev)
 170 +{
 171 +       int err = 0;
 172 +       struct device *dev = &pdev->dev;
 173 +       struct device_node *np = dev->of_node;
 174 +       struct ft5406 * ts;
 175 +       struct device_node *fw_node;
 176 +       struct rpi_firmware *fw;
 177 +       u32 touchbuf;
 178 +
 179 +       dev_info(dev, "Probing device\n");
 180 +
 181 +       fw_node = of_parse_phandle(np, "firmware", 0);
 182 +       if (!fw_node) {
 183 +               dev_err(dev, "Missing firmware node\n");
 184 +               return -ENOENT;
 185 +       }
 186 +
 187 +       fw = rpi_firmware_get(fw_node);
 188 +       if (!fw)
 189 +               return -EPROBE_DEFER;
 190 +
 191 +       ts = devm_kzalloc(dev, sizeof(struct ft5406), GFP_KERNEL);
 192 +       if (!ts) {
 193 +               dev_err(dev, "Failed to allocate memory\n");
 194 +               return -ENOMEM;
 195 +       }
 196 +
 197 +       ts->input_dev = input_allocate_device();
 198 +       if (!ts->input_dev) {
 199 +               dev_err(dev, "Failed to allocate input device\n");
 200 +               return -ENOMEM;
 201 +       }
 202 +
 203 +       ts->ts_base = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->bus_addr, GFP_KERNEL);
 204 +       if (!ts->ts_base) {
 205 +               pr_err("[%s]: failed to dma_alloc_coherent(%ld)\n",
 206 +                               __func__, PAGE_SIZE);
 207 +               err = -ENOMEM;
 208 +               goto out;
 209 +       }
 210 +
 211 +       touchbuf = (u32)ts->bus_addr;
 212 +       err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
 213 +                                   &touchbuf, sizeof(touchbuf));
 214 +
 215 +       if (err || touchbuf != 0) {
 216 +               dev_warn(dev, "Failed to set touchbuf, trying to get err:%x\n", err);
 217 +               dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
 218 +               ts->ts_base = 0;
 219 +               ts->bus_addr = 0;
 220 +       }
 221 +
 222 +       if (!ts->ts_base) {
 223 +               dev_warn(dev, "set failed, trying get (err:%d touchbuf:%x virt:%p bus:%x)\n", err, touchbuf, ts->ts_base, ts->bus_addr);
 224 +
 225 +               err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF,
 226 +                                   &touchbuf, sizeof(touchbuf));
 227 +               if (err) {
 228 +                       dev_err(dev, "Failed to get touch buffer\n");
 229 +                       goto out;
 230 +               }
 231 +
 232 +               if (!touchbuf) {
 233 +                       dev_err(dev, "Touchscreen not detected\n");
 234 +                       err = -ENODEV;
 235 +                       goto out;
 236 +               }
 237 +
 238 +               dev_dbg(dev, "Got TS buffer 0x%x\n", touchbuf);
 239 +
 240 +               // mmap the physical memory
 241 +               touchbuf &= ~0xc0000000;
 242 +               ts->ts_base = ioremap(touchbuf, sizeof(struct ft5406_regs));
 243 +               if (ts->ts_base == NULL)
 244 +               {
 245 +                       dev_err(dev, "Failed to map physical address\n");
 246 +                       err = -ENOMEM;
 247 +                       goto out;
 248 +               }
 249 +       }
 250 +       platform_set_drvdata(pdev, ts);
 251 +       ts->pdev = pdev;
 252 +
 253 +       ts->input_dev->name = "FT5406 memory based driver";
 254 +
 255 +       __set_bit(EV_KEY, ts->input_dev->evbit);
 256 +       __set_bit(EV_SYN, ts->input_dev->evbit);
 257 +       __set_bit(EV_ABS, ts->input_dev->evbit);
 258 +
 259 +       input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X, 0,
 260 +                            SCREEN_WIDTH, 0, 0);
 261 +       input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, 0,
 262 +                            SCREEN_HEIGHT, 0, 0);
 263 +
 264 +       input_mt_init_slots(ts->input_dev, MAXIMUM_SUPPORTED_POINTS, INPUT_MT_DIRECT);
 265 +
 266 +       input_set_drvdata(ts->input_dev, ts);
 267 +
 268 +       err = input_register_device(ts->input_dev);
 269 +       if (err) {
 270 +               dev_err(dev, "could not register input device, %d\n",
 271 +                       err);
 272 +               goto out;
 273 +       }
 274 +
 275 +       // create thread to poll the touch events
 276 +       ts->thread = kthread_run(ft5406_thread, ts, "ft5406");
 277 +       if(ts->thread == NULL)
 278 +       {
 279 +               dev_err(dev, "Failed to create kernel thread");
 280 +               err = -ENOMEM;
 281 +               goto out;
 282 +       }
 283 +
 284 +       return 0;
 285 +
 286 +out:
 287 +       if (ts->bus_addr) {
 288 +               dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
 289 +               ts->bus_addr = 0;
 290 +               ts->ts_base = NULL;
 291 +       } else if (ts->ts_base) {
 292 +               iounmap(ts->ts_base);
 293 +               ts->ts_base = NULL;
 294 +       }
 295 +       if (ts->input_dev) {
 296 +               input_unregister_device(ts->input_dev);
 297 +               ts->input_dev = NULL;
 298 +       }
 299 +       return err;
 300 +}
 301 +
 302 +static int ft5406_remove(struct platform_device *pdev)
 303 +{
 304 +       struct device *dev = &pdev->dev;
 305 +       struct ft5406 *ts = (struct ft5406 *) platform_get_drvdata(pdev);
 306 +
 307 +       dev_info(dev, "Removing rpi-ft5406\n");
 308 +
 309 +       kthread_stop(ts->thread);
 310 +
 311 +       if (ts->bus_addr)
 312 +               dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
 313 +       else if (ts->ts_base)
 314 +               iounmap(ts->ts_base);
 315 +       if (ts->input_dev)
 316 +               input_unregister_device(ts->input_dev);
 317 +
 318 +       return 0;
 319 +}
 320 +
 321 +static const struct of_device_id ft5406_match[] = {
 322 +       { .compatible = "rpi,rpi-ft5406", },
 323 +       {},
 324 +};
 325 +MODULE_DEVICE_TABLE(of, ft5406_match);
 326 +
 327 +static struct platform_driver ft5406_driver = {
 328 +       .driver = {
 329 +               .name   = "rpi-ft5406",
 330 +               .owner  = THIS_MODULE,
 331 +               .of_match_table = ft5406_match,
 332 +       },
 333 +       .probe          = ft5406_probe,
 334 +       .remove         = ft5406_remove,
 335 +};
 336 +
 337 +module_platform_driver(ft5406_driver);
 338 +
 339 +MODULE_AUTHOR("Gordon Hollingworth");
 340 +MODULE_DESCRIPTION("Touchscreen driver for memory based FT5406");
 341 +MODULE_LICENSE("GPL");
 342 --- a/include/soc/bcm2835/raspberrypi-firmware.h
 343 +++ b/include/soc/bcm2835/raspberrypi-firmware.h
 344 @@ -115,6 +115,7 @@ enum rpi_firmware_property_tag {
 345         RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET =         0x00048009,
 346         RPI_FIRMWARE_FRAMEBUFFER_SET_OVERSCAN =               0x0004800a,
 347         RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE =                0x0004800b,
 348 +       RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF =               0x0004801f,
 349         RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC =                  0x0004800e,
 350         RPI_FIRMWARE_FRAMEBUFFER_SET_BACKLIGHT =              0x0004800f,
 351