drivers/input/touchscreen/corgi_ts.c

   1 /*
   2  *  Touchscreen driver for Sharp SL-C7xx and SL-Cxx00 models
   3  *
   4  *  Copyright (c) 2004-2005 Richard Purdie
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2 as
   8  *  published by the Free Software Foundation.
   9  *
  10  */
  11
  12
  13 #include <linux/delay.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/init.h>
  16 #include <linux/input.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/irq.h>
  21
  22 #include <mach/sharpsl.h>
  23 #include <mach/hardware.h>
  24 #include <mach/pxa-regs.h>
  25 #include <mach/pxa2xx-gpio.h>
  26
  27
  28 #define PWR_MODE_ACTIVE         0
  29 #define PWR_MODE_SUSPEND        1
  30
  31 #define X_AXIS_MAX              3830
  32 #define X_AXIS_MIN              150
  33 #define Y_AXIS_MAX              3830
  34 #define Y_AXIS_MIN              190
  35 #define PRESSURE_MIN            0
  36 #define PRESSURE_MAX            15000
  37
  38 struct ts_event {
  39         short pressure;
  40         short x;
  41         short y;
  42 };
  43
  44 struct corgi_ts {
  45         struct input_dev *input;
  46         struct timer_list timer;
  47         struct ts_event tc;
  48         int pendown;
  49         int power_mode;
  50         int irq_gpio;
  51         struct corgits_machinfo *machinfo;
  52 };
  53
  54 #ifdef CONFIG_PXA25x
  55 #define CCNT(a)         asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
  56 #define PMNC_GET(x)     asm volatile ("mrc p14, 0, %0, C0, C0, 0" : "=r"(x))
  57 #define PMNC_SET(x)     asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(x))
  58 #endif
  59 #ifdef CONFIG_PXA27x
  60 #define CCNT(a)         asm volatile ("mrc p14, 0, %0, C1, C1, 0" : "=r"(a))
  61 #define PMNC_GET(x)     asm volatile ("mrc p14, 0, %0, C0, C1, 0" : "=r"(x))
  62 #define PMNC_SET(x)     asm volatile ("mcr p14, 0, %0, C0, C1, 0" : : "r"(x))
  63 #endif
  64
  65 /* ADS7846 Touch Screen Controller bit definitions */
  66 #define ADSCTRL_PD0             (1u << 0)       /* PD0 */
  67 #define ADSCTRL_PD1             (1u << 1)       /* PD1 */
  68 #define ADSCTRL_DFR             (1u << 2)       /* SER/DFR */
  69 #define ADSCTRL_MOD             (1u << 3)       /* Mode */
  70 #define ADSCTRL_ADR_SH  4       /* Address setting */
  71 #define ADSCTRL_STS             (1u << 7)       /* Start Bit */
  72
  73 /* External Functions */
  74 extern unsigned int get_clk_frequency_khz(int info);
  75
  76 static unsigned long calc_waittime(struct corgi_ts *corgi_ts)
  77 {
  78         unsigned long hsync_invperiod = corgi_ts->machinfo->get_hsync_invperiod();
  79
  80         if (hsync_invperiod)
  81                 return get_clk_frequency_khz(0)*1000/hsync_invperiod;
  82         else
  83                 return 0;
  84 }
  85
  86 static int sync_receive_data_send_cmd(struct corgi_ts *corgi_ts, int doRecive, int doSend,
  87                 unsigned int address, unsigned long wait_time)
  88 {
  89         unsigned long timer1 = 0, timer2, pmnc = 0;
  90         int pos = 0;
  91
  92         if (wait_time && doSend) {
  93                 PMNC_GET(pmnc);
  94                 if (!(pmnc & 0x01))
  95                         PMNC_SET(0x01);
  96
  97                 /* polling HSync */
  98                 corgi_ts->machinfo->wait_hsync();
  99                 /* get CCNT */
 100                 CCNT(timer1);
 101         }
 102
 103         if (doRecive)
 104                 pos = corgi_ssp_ads7846_get();
 105
 106         if (doSend) {
 107                 int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
 108                 /* dummy command */
 109                 corgi_ssp_ads7846_put(cmd);
 110                 corgi_ssp_ads7846_get();
 111
 112                 if (wait_time) {
 113                         /* Wait after HSync */
 114                         CCNT(timer2);
 115                         if (timer2-timer1 > wait_time) {
 116                                 /* too slow - timeout, try again */
 117                                 corgi_ts->machinfo->wait_hsync();
 118                                 /* get CCNT */
 119                                 CCNT(timer1);
 120                                 /* Wait after HSync */
 121                                 CCNT(timer2);
 122                         }
 123                         while (timer2 - timer1 < wait_time)
 124                                 CCNT(timer2);
 125                 }
 126                 corgi_ssp_ads7846_put(cmd);
 127                 if (wait_time && !(pmnc & 0x01))
 128                         PMNC_SET(pmnc);
 129         }
 130         return pos;
 131 }
 132
 133 static int read_xydata(struct corgi_ts *corgi_ts)
 134 {
 135         unsigned int x, y, z1, z2;
 136         unsigned long flags, wait_time;
 137
 138         /* critical section */
 139         local_irq_save(flags);
 140         corgi_ssp_ads7846_lock();
 141         wait_time = calc_waittime(corgi_ts);
 142
 143         /* Y-axis */
 144         sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time);
 145
 146         /* Y-axis */
 147         sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time);
 148
 149         /* X-axis */
 150         y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time);
 151
 152         /* Z1 */
 153         x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time);
 154
 155         /* Z2 */
 156         z1 = sync_receive_data_send_cmd(corgi_ts, 1, 1, 4u, wait_time);
 157         z2 = sync_receive_data_send_cmd(corgi_ts, 1, 0, 4u, wait_time);
 158
 159         /* Power-Down Enable */
 160         corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 161         corgi_ssp_ads7846_get();
 162
 163         corgi_ssp_ads7846_unlock();
 164         local_irq_restore(flags);
 165
 166         if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
 167                 corgi_ts->tc.pressure = 0;
 168                 return 0;
 169         }
 170
 171         corgi_ts->tc.x = x;
 172         corgi_ts->tc.y = y;
 173         corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
 174         return 1;
 175 }
 176
 177 static void new_data(struct corgi_ts *corgi_ts)
 178 {
 179         struct input_dev *dev = corgi_ts->input;
 180
 181         if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
 182                 return;
 183
 184         if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
 185                 return;
 186
 187         input_report_abs(dev, ABS_X, corgi_ts->tc.x);
 188         input_report_abs(dev, ABS_Y, corgi_ts->tc.y);
 189         input_report_abs(dev, ABS_PRESSURE, corgi_ts->tc.pressure);
 190         input_report_key(dev, BTN_TOUCH, corgi_ts->pendown);
 191         input_sync(dev);
 192 }
 193
 194 static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer)
 195 {
 196         if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) {
 197                 /* Disable Interrupt */
 198                 set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_NONE);
 199                 if (read_xydata(corgi_ts)) {
 200                         corgi_ts->pendown = 1;
 201                         new_data(corgi_ts);
 202                 }
 203                 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
 204         } else {
 205                 if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
 206                         mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
 207                         corgi_ts->pendown++;
 208                         return;
 209                 }
 210
 211                 if (corgi_ts->pendown) {
 212                         corgi_ts->tc.pressure = 0;
 213                         new_data(corgi_ts);
 214                 }
 215
 216                 /* Enable Falling Edge */
 217                 set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
 218                 corgi_ts->pendown = 0;
 219         }
 220 }
 221
 222 static void corgi_ts_timer(unsigned long data)
 223 {
 224         struct corgi_ts *corgits_data = (struct corgi_ts *) data;
 225
 226         ts_interrupt_main(corgits_data, 1);
 227 }
 228
 229 static irqreturn_t ts_interrupt(int irq, void *dev_id)
 230 {
 231         struct corgi_ts *corgits_data = dev_id;
 232
 233         ts_interrupt_main(corgits_data, 0);
 234         return IRQ_HANDLED;
 235 }
 236
 237 #ifdef CONFIG_PM
 238 static int corgits_suspend(struct platform_device *dev, pm_message_t state)
 239 {
 240         struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
 241
 242         if (corgi_ts->pendown) {
 243                 del_timer_sync(&corgi_ts->timer);
 244                 corgi_ts->tc.pressure = 0;
 245                 new_data(corgi_ts);
 246                 corgi_ts->pendown = 0;
 247         }
 248         corgi_ts->power_mode = PWR_MODE_SUSPEND;
 249
 250         corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 251
 252         return 0;
 253 }
 254
 255 static int corgits_resume(struct platform_device *dev)
 256 {
 257         struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
 258
 259         corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 260         /* Enable Falling Edge */
 261         set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
 262         corgi_ts->power_mode = PWR_MODE_ACTIVE;
 263
 264         return 0;
 265 }
 266 #else
 267 #define corgits_suspend         NULL
 268 #define corgits_resume          NULL
 269 #endif
 270
 271 static int __devinit corgits_probe(struct platform_device *pdev)
 272 {
 273         struct corgi_ts *corgi_ts;
 274         struct input_dev *input_dev;
 275         int err = -ENOMEM;
 276
 277         corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL);
 278         input_dev = input_allocate_device();
 279         if (!corgi_ts || !input_dev)
 280                 goto fail1;
 281
 282         platform_set_drvdata(pdev, corgi_ts);
 283
 284         corgi_ts->machinfo = pdev->dev.platform_data;
 285         corgi_ts->irq_gpio = platform_get_irq(pdev, 0);
 286
 287         if (corgi_ts->irq_gpio < 0) {
 288                 err = -ENODEV;
 289                 goto fail1;
 290         }
 291
 292         corgi_ts->input = input_dev;
 293
 294         init_timer(&corgi_ts->timer);
 295         corgi_ts->timer.data = (unsigned long) corgi_ts;
 296         corgi_ts->timer.function = corgi_ts_timer;
 297
 298         input_dev->name = "Corgi Touchscreen";
 299         input_dev->phys = "corgits/input0";
 300         input_dev->id.bustype = BUS_HOST;
 301         input_dev->id.vendor = 0x0001;
 302         input_dev->id.product = 0x0002;
 303         input_dev->id.version = 0x0100;
 304         input_dev->dev.parent = &pdev->dev;
 305
 306         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 307         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 308         input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
 309         input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
 310         input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
 311
 312         pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | GPIO_IN);
 313
 314         /* Initiaize ADS7846 Difference Reference mode */
 315         corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 316         mdelay(5);
 317         corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 318         mdelay(5);
 319         corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 320         mdelay(5);
 321         corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 322         mdelay(5);
 323
 324         if (request_irq(corgi_ts->irq_gpio, ts_interrupt, IRQF_DISABLED, "ts", corgi_ts)) {
 325                 err = -EBUSY;
 326                 goto fail1;
 327         }
 328
 329         err = input_register_device(corgi_ts->input);
 330         if (err)
 331                 goto fail2;
 332
 333         corgi_ts->power_mode = PWR_MODE_ACTIVE;
 334
 335         /* Enable Falling Edge */
 336         set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
 337
 338         return 0;
 339
 340  fail2: free_irq(corgi_ts->irq_gpio, corgi_ts);
 341  fail1: input_free_device(input_dev);
 342         kfree(corgi_ts);
 343         return err;
 344 }
 345
 346 static int __devexit corgits_remove(struct platform_device *pdev)
 347 {
 348         struct corgi_ts *corgi_ts = platform_get_drvdata(pdev);
 349
 350         free_irq(corgi_ts->irq_gpio, corgi_ts);
 351         del_timer_sync(&corgi_ts->timer);
 352         corgi_ts->machinfo->put_hsync();
 353         input_unregister_device(corgi_ts->input);
 354         kfree(corgi_ts);
 355
 356         return 0;
 357 }
 358
 359 static struct platform_driver corgits_driver = {
 360         .probe          = corgits_probe,
 361         .remove         = __devexit_p(corgits_remove),
 362         .suspend        = corgits_suspend,
 363         .resume         = corgits_resume,
 364         .driver         = {
 365                 .name   = "corgi-ts",
 366                 .owner  = THIS_MODULE,
 367         },
 368 };
 369
 370 static int __init corgits_init(void)
 371 {
 372         return platform_driver_register(&corgits_driver);
 373 }
 374
 375 static void __exit corgits_exit(void)
 376 {
 377         platform_driver_unregister(&corgits_driver);
 378 }
 379
 380 module_init(corgits_init);
 381 module_exit(corgits_exit);
 382
 383 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 384 MODULE_DESCRIPTION("Corgi TouchScreen Driver");
 385 MODULE_LICENSE("GPL");
 386 MODULE_ALIAS("platform:corgi-ts");