target/linux/xburst/patches-2.6.36/061-touchscreen.patch

   1 From 499be7c13f157eb6ecf93b8b8187a67d61f0f3d6 Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Sun, 5 Sep 2010 20:45:08 +0200
   4 Subject: [PATCH] input: Add touchscreen driver for the JZ4740 SoC
   5
   6 This patch adds a touchscreen driver for the Ingenic JZ4740 SoC.
   7 The touchscreen controller is part of the ADC unit and thus this driver is a mfd
   8 cell from the jz4740-adc driver.
   9
  10 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
  11 ---
  12  drivers/input/touchscreen/Kconfig     |   12 ++
  13  drivers/input/touchscreen/Makefile    |    1 +
  14  drivers/input/touchscreen/jz4740-ts.c |  330 +++++++++++++++++++++++++++++++++
  15  3 files changed, 343 insertions(+), 0 deletions(-)
  16  create mode 100644 drivers/input/touchscreen/jz4740-ts.c
  17
  18 --- a/drivers/input/touchscreen/Kconfig
  19 +++ b/drivers/input/touchscreen/Kconfig
  20 @@ -638,4 +638,16 @@ config TOUCHSCREEN_STMPE
  21           To compile this driver as a module, choose M here: the
  22           module will be called stmpe-ts.
  23
  24 +config TOUCHSCREEN_JZ4740
  25 +       tristate "JZ4740 touchscreen support"
  26 +       depends on MFD_JZ4740_ADC
  27 +       help
  28 +         Say Y here if you want support for the touchscreen controller found on
  29 +         Ingenic JZ4740 SoCs.
  30 +
  31 +         If unsure, say N.
  32 +
  33 +         To compile this driver as a module, choose M here: the
  34 +         module will be called jz4740-ts.
  35 +
  36  endif
  37 --- a/drivers/input/touchscreen/Makefile
  38 +++ b/drivers/input/touchscreen/Makefile
  39 @@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI)                += eeti_
  40  obj-$(CONFIG_TOUCHSCREEN_ELO)          += elo.o
  41  obj-$(CONFIG_TOUCHSCREEN_FUJITSU)      += fujitsu_ts.o
  42  obj-$(CONFIG_TOUCHSCREEN_INEXIO)       += inexio.o
  43 +obj-$(CONFIG_TOUCHSCREEN_JZ4740)       += jz4740-ts.o
  44  obj-$(CONFIG_TOUCHSCREEN_MC13783)      += mc13783_ts.o
  45  obj-$(CONFIG_TOUCHSCREEN_MCS5000)      += mcs5000_ts.o
  46  obj-$(CONFIG_TOUCHSCREEN_MIGOR)                += migor_ts.o
  47 --- /dev/null
  48 +++ b/drivers/input/touchscreen/jz4740-ts.c
  49 @@ -0,0 +1,330 @@
  50 +/*
  51 + * Touchscreen driver for Ingenic JZ SoCs.
  52 + *
  53 + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  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/interrupt.h>
  62 +#include <linux/kernel.h>
  63 +#include <linux/module.h>
  64 +#include <linux/platform_device.h>
  65 +#include <linux/slab.h>
  66 +
  67 +#include <linux/delay.h>
  68 +#include <linux/mfd/core.h>
  69 +#include <linux/input.h>
  70 +#include <linux/bitops.h>
  71 +#include <linux/jz4740-adc.h>
  72 +
  73 +struct jz4740_ts {
  74 +       struct platform_device *pdev;
  75 +
  76 +       struct resource *mem;
  77 +       void __iomem *base;
  78 +
  79 +       int irq_penup;
  80 +       int irq_pendown;
  81 +       int irq_data_ready;
  82 +
  83 +       struct mfd_cell *cell;
  84 +       struct input_dev *input;
  85 +
  86 +       bool is_open;
  87 +};
  88 +
  89 +static irqreturn_t jz4740_ts_data_ready_irq_handler(int irq, void *devid)
  90 +{
  91 +       struct jz4740_ts *jz4740_ts = devid;
  92 +       uint32_t data;
  93 +       unsigned long x, y, z1, z2, pressure;
  94 +
  95 +       data = readl(jz4740_ts->base + 0x08);
  96 +       x = data & 0xfff;
  97 +       y = (data >> 16) & 0xfff;
  98 +
  99 +       data = readl(jz4740_ts->base + 0x08);
 100 +       z1 = data & 0xfff;
 101 +       z2 = (data >> 16) & 0xfff;
 102 +       if (z1 == 0) {
 103 +               pressure = 4095UL;
 104 +       } else if (z1 > z2) {
 105 +               pressure = 0;
 106 +       } else {
 107 +               if (data & 0x8000)
 108 +                       pressure = (((480UL * x * z2) / z1) - 480UL * x) / 4096UL;
 109 +               else
 110 +                       pressure = (((272UL * y * z2) / z1) - 272UL * y) / 4096UL;
 111 +               if (pressure >= 4096UL)
 112 +                       pressure = 4095UL;
 113 +               pressure = 4095UL - pressure;
 114 +       }
 115 +
 116 +       input_report_abs(jz4740_ts->input, ABS_X, y);
 117 +       input_report_abs(jz4740_ts->input, ABS_Y, 4095 - x);
 118 +       input_report_abs(jz4740_ts->input, ABS_PRESSURE, pressure);
 119 +       input_report_key(jz4740_ts->input, BTN_TOUCH, 1);
 120 +       input_sync(jz4740_ts->input);
 121 +
 122 +       return IRQ_HANDLED;
 123 +}
 124 +
 125 +static irqreturn_t jz4740_ts_pen_irq_handler(int irq, void *devid)
 126 +{
 127 +       struct jz4740_ts *jz4740_ts = devid;
 128 +       int is_pressed;
 129 +
 130 +       if (irq == jz4740_ts->irq_penup) {
 131 +               enable_irq(jz4740_ts->irq_pendown);
 132 +               is_pressed = 0;
 133 +       } else {
 134 +               enable_irq(jz4740_ts->irq_penup);
 135 +               is_pressed = 1;
 136 +       }
 137 +       disable_irq_nosync(irq);
 138 +
 139 +       printk("pen irq: %d\n", irq);
 140 +       input_report_key(jz4740_ts->input, BTN_TOUCH, is_pressed);
 141 +       if (is_pressed == 0)
 142 +               input_report_abs(jz4740_ts->input, ABS_PRESSURE, 0);
 143 +       input_sync(jz4740_ts->input);
 144 +
 145 +       return IRQ_HANDLED;
 146 +}
 147 +
 148 +static int jz4740_ts_open(struct input_dev *input)
 149 +{
 150 +       struct jz4740_ts *jz4740_ts = input_get_drvdata(input);
 151 +
 152 +       jz4740_ts->is_open = true;
 153 +       jz4740_ts->cell->enable(jz4740_ts->pdev);
 154 +
 155 +       return 0;
 156 +}
 157 +
 158 +static void jz4740_ts_close(struct input_dev *input)
 159 +{
 160 +       struct jz4740_ts *jz4740_ts = input_get_drvdata(input);
 161 +
 162 +       jz4740_ts->cell->disable(jz4740_ts->pdev);
 163 +       jz4740_ts->is_open = false;
 164 +}
 165 +
 166 +static int __devinit jz4740_ts_probe(struct platform_device *pdev)
 167 +{
 168 +       int ret = 0;
 169 +       struct jz4740_ts *jz4740_ts;
 170 +       struct input_dev *input;
 171 +
 172 +       jz4740_ts = kzalloc(sizeof(*jz4740_ts), GFP_KERNEL);
 173 +       if (!jz4740_ts) {
 174 +               dev_err(&pdev->dev, "Failed to allocate driver structure\n");
 175 +               return -ENOMEM;
 176 +       }
 177 +
 178 +       jz4740_ts->pdev = pdev;
 179 +       jz4740_ts->cell = pdev->dev.platform_data;
 180 +
 181 +       jz4740_ts->irq_data_ready = platform_get_irq(pdev, 0);
 182 +       if (jz4740_ts->irq_data_ready < 0) {
 183 +               ret = jz4740_ts->irq_data_ready;
 184 +               dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
 185 +               goto err_free;
 186 +       }
 187 +
 188 +       jz4740_ts->irq_penup = platform_get_irq(pdev, 1);
 189 +       if (jz4740_ts->irq_penup < 0) {
 190 +               ret = jz4740_ts->irq_penup;
 191 +               dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
 192 +               goto err_free;
 193 +       }
 194 +
 195 +       jz4740_ts->irq_pendown = platform_get_irq(pdev, 2);
 196 +       if (jz4740_ts->irq_pendown < 0) {
 197 +               ret = jz4740_ts->irq_pendown;
 198 +               dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
 199 +               goto err_free;
 200 +       }
 201 +
 202 +       jz4740_ts->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 203 +       if (!jz4740_ts->mem) {
 204 +               ret = -ENOENT;
 205 +               dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
 206 +               goto err_free;
 207 +       }
 208 +
 209 +       jz4740_ts->mem = request_mem_region(jz4740_ts->mem->start,
 210 +                               resource_size(jz4740_ts->mem),  pdev->name);
 211 +       if (!jz4740_ts->mem) {
 212 +               ret = -EBUSY;
 213 +               dev_err(&pdev->dev, "Failed to request mmio memory region\n");
 214 +               goto err_free;
 215 +       }
 216 +
 217 +       jz4740_ts->base = ioremap_nocache(jz4740_ts->mem->start,
 218 +                               resource_size(jz4740_ts->mem));
 219 +       if (!jz4740_ts->base) {
 220 +               ret = -EBUSY;
 221 +               dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
 222 +               goto err_release_mem_region;
 223 +       }
 224 +
 225 +       input = input_allocate_device();
 226 +       if (!input) {
 227 +               dev_err(&pdev->dev, "Failed to allocate input device\n");
 228 +               ret = -ENOMEM;
 229 +               goto err_iounmap;
 230 +       }
 231 +
 232 +       input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 233 +       __set_bit(BTN_TOUCH, input->keybit);
 234 +
 235 +       input_set_abs_params(input, ABS_X, 150, 3920, 0, 0);
 236 +       input_set_abs_params(input, ABS_Y, 270, 3700, 0, 0);
 237 +       input_set_abs_params(input, ABS_PRESSURE, 0, 4096, 0, 0);
 238 +
 239 +       input->name = pdev->name;
 240 +       input->phys = "jz4740";
 241 +       input->id.bustype = BUS_HOST;
 242 +       input->dev.parent = &pdev->dev;
 243 +
 244 +       input->open = jz4740_ts_open;
 245 +       input->close = jz4740_ts_close;
 246 +
 247 +       input_set_drvdata(input, jz4740_ts);
 248 +
 249 +       ret = input_register_device(input);
 250 +       if (ret) {
 251 +               dev_err(&pdev->dev, "Failed to register input device: %d\n", ret);
 252 +               input_free_device(input);
 253 +               goto err_iounmap;
 254 +       }
 255 +       jz4740_ts->input = input;
 256 +
 257 +       ret = request_irq(jz4740_ts->irq_data_ready, jz4740_ts_data_ready_irq_handler, 0, pdev->name,
 258 +                       jz4740_ts);
 259 +       if (ret) {
 260 +               dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
 261 +               goto err_input_unregister_device;
 262 +       }
 263 +       ret = request_irq(jz4740_ts->irq_penup, jz4740_ts_pen_irq_handler, 0, pdev->name,
 264 +                       jz4740_ts);
 265 +       if (ret) {
 266 +               dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
 267 +               goto err_free_irq_data_ready;
 268 +       }
 269 +       disable_irq(jz4740_ts->irq_penup);
 270 +       ret = request_irq(jz4740_ts->irq_pendown, jz4740_ts_pen_irq_handler, 0, pdev->name,
 271 +                       jz4740_ts);
 272 +       if (ret) {
 273 +               dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
 274 +               goto err_free_irq_penup;
 275 +       }
 276 +       platform_set_drvdata(pdev, jz4740_ts);
 277 +
 278 +       jz4740_adc_set_config(pdev->dev.parent,
 279 +               JZ_ADC_CONFIG_EX_IN | JZ_ADC_CONFIG_XYZ_OFFSET(2) | JZ_ADC_CONFIG_DNUM(7),
 280 +               JZ_ADC_CONFIG_EX_IN | JZ_ADC_CONFIG_XYZ_MASK | JZ_ADC_CONFIG_DNUM_MASK);
 281 +
 282 +
 283 +       writel(0x15e, jz4740_ts->base);
 284 +       writel(0x32, jz4740_ts->base + 0x04);
 285 +
 286 +       return 0;
 287 +
 288 +err_free_irq_penup:
 289 +       free_irq(jz4740_ts->irq_penup, jz4740_ts);
 290 +err_free_irq_data_ready:
 291 +       free_irq(jz4740_ts->irq_data_ready, jz4740_ts);
 292 +err_input_unregister_device:
 293 +       input_unregister_device(jz4740_ts->input);
 294 +err_iounmap:
 295 +       platform_set_drvdata(pdev, NULL);
 296 +       iounmap(jz4740_ts->base);
 297 +err_release_mem_region:
 298 +       release_mem_region(jz4740_ts->mem->start, resource_size(jz4740_ts->mem));
 299 +err_free:
 300 +       kfree(jz4740_ts);
 301 +       return ret;
 302 +}
 303 +
 304 +static int __devexit jz4740_ts_remove(struct platform_device *pdev)
 305 +{
 306 +       struct jz4740_ts *jz4740_ts = platform_get_drvdata(pdev);
 307 +
 308 +
 309 +       free_irq(jz4740_ts->irq_pendown, jz4740_ts);
 310 +       free_irq(jz4740_ts->irq_penup, jz4740_ts);
 311 +       free_irq(jz4740_ts->irq_data_ready, jz4740_ts);
 312 +
 313 +       input_unregister_device(jz4740_ts->input);
 314 +
 315 +       iounmap(jz4740_ts->base);
 316 +       release_mem_region(jz4740_ts->mem->start, resource_size(jz4740_ts->mem));
 317 +
 318 +       kfree(jz4740_ts);
 319 +
 320 +       return 0;
 321 +}
 322 +
 323 +#ifdef CONFIG_PM
 324 +static int jz4740_ts_suspend(struct device *dev)
 325 +{
 326 +       struct jz4740_ts *jz4740_ts = dev_get_drvdata(dev);
 327 +
 328 +       if (jz4740_ts->is_open);
 329 +               jz4740_ts->cell->disable(jz4740_ts->pdev);
 330 +
 331 +       return 0;
 332 +}
 333 +
 334 +static int jz4740_ts_resume(struct device *dev)
 335 +{
 336 +       struct jz4740_ts *jz4740_ts = dev_get_drvdata(dev);
 337 +
 338 +       if (jz4740_ts->is_open);
 339 +               jz4740_ts->cell->enable(jz4740_ts->pdev);
 340 +
 341 +       return 0;
 342 +}
 343 +
 344 +static const struct dev_pm_ops jz4740_ts_pm_ops = {
 345 +       .suspend        = jz4740_ts_suspend,
 346 +       .resume         = jz4740_ts_resume,
 347 +};
 348 +
 349 +#define JZ4740_TS_PM_OPS (&jz4740_ts_pm_ops)
 350 +#else
 351 +#define JZ4740_TS_PM_OPS NULL
 352 +#endif
 353 +
 354 +static struct platform_driver jz4740_ts_driver = {
 355 +       .probe          = jz4740_ts_probe,
 356 +       .remove         = __devexit_p(jz4740_ts_remove),
 357 +       .driver = {
 358 +               .name = "jz4740-ts",
 359 +               .owner = THIS_MODULE,
 360 +               .pm = JZ4740_TS_PM_OPS,
 361 +       },
 362 +};
 363 +
 364 +static int __init jz4740_ts_init(void)
 365 +{
 366 +       return platform_driver_register(&jz4740_ts_driver);
 367 +}
 368 +module_init(jz4740_ts_init);
 369 +
 370 +static void __exit jz4740_ts_exit(void)
 371 +{
 372 +       platform_driver_unregister(&jz4740_ts_driver);
 373 +}
 374 +module_exit(jz4740_ts_exit);
 375 +
 376 +MODULE_ALIAS("platform:jz4740-ts");
 377 +MODULE_LICENSE("GPL");
 378 +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 379 +MODULE_DESCRIPTION("JZ4740 SoC battery driver");