drivers/input/touchscreen/corgi_ts.c

   1 /*
   2  *  Touchscreen driver for Sharp Corgi models (SL-C7xx)
   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/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 <asm/irq.h>
  21
  22 #include <asm/arch/corgi.h>
  23 #include <asm/arch/hardware.h>
  24 #include <asm/arch/pxa-regs.h>
  25
  26
  27 #define PWR_MODE_ACTIVE         0
  28 #define PWR_MODE_SUSPEND        1
  29
  30 #define X_AXIS_MAX              3830
  31 #define X_AXIS_MIN              150
  32 #define Y_AXIS_MAX              3830
  33 #define Y_AXIS_MIN              190
  34 #define PRESSURE_MIN            0
  35 #define PRESSURE_MAX            15000
  36
  37 struct ts_event {
  38         short pressure;
  39         short x;
  40         short y;
  41 };
  42
  43 struct corgi_ts {
  44         char phys[32];
  45         struct input_dev input;
  46         struct timer_list timer;
  47         struct ts_event tc;
  48         int pendown;
  49         int power_mode;
  50 };
  51
  52 #define STATUS_HSYNC            (GPLR(CORGI_GPIO_HSYNC) & GPIO_bit(CORGI_GPIO_HSYNC))
  53
  54 #define SyncHS()        while((STATUS_HSYNC) == 0); while((STATUS_HSYNC) != 0);
  55 #define CCNT(a)         asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
  56 #define CCNT_ON()       {int pmnc = 1; asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(pmnc));}
  57 #define CCNT_OFF()      {int pmnc = 0; asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(pmnc));}
  58
  59 #define WAIT_HS_400_VGA         7013U   // 17.615us
  60 #define WAIT_HS_400_QVGA        16622U  // 41.750us
  61
  62
  63 /* ADS7846 Touch Screen Controller bit definitions */
  64 #define ADSCTRL_PD0             (1u << 0)       /* PD0 */
  65 #define ADSCTRL_PD1             (1u << 1)       /* PD1 */
  66 #define ADSCTRL_DFR             (1u << 2)       /* SER/DFR */
  67 #define ADSCTRL_MOD             (1u << 3)       /* Mode */
  68 #define ADSCTRL_ADR_SH  4       /* Address setting */
  69 #define ADSCTRL_STS             (1u << 7)       /* Start Bit */
  70
  71 /* External Functions */
  72 extern int w100fb_get_xres(void);
  73 extern int w100fb_get_blanking(void);
  74 extern int w100fb_get_fastsysclk(void);
  75 extern unsigned int get_clk_frequency_khz(int info);
  76
  77 static unsigned long calc_waittime(void)
  78 {
  79         int w100fb_xres = w100fb_get_xres();
  80         unsigned int waittime = 0;
  81
  82         if (w100fb_xres == 480 || w100fb_xres == 640) {
  83                 waittime = WAIT_HS_400_VGA * get_clk_frequency_khz(0) / 398131U;
  84
  85                 if (w100fb_get_fastsysclk() == 100)
  86                         waittime = waittime * 75 / 100;
  87
  88                 if (w100fb_xres == 640)
  89                         waittime *= 3;
  90
  91                 return waittime;
  92         }
  93
  94         return WAIT_HS_400_QVGA * get_clk_frequency_khz(0) / 398131U;
  95 }
  96
  97 static int sync_receive_data_send_cmd(int doRecive, int doSend, unsigned int address, unsigned long wait_time)
  98 {
  99         int pos = 0;
 100         unsigned long timer1 = 0, timer2;
 101         int dosleep;
 102
 103         dosleep = !w100fb_get_blanking();
 104
 105         if (dosleep && doSend) {
 106                 CCNT_ON();
 107                 /* polling HSync */
 108                 SyncHS();
 109                 /* get CCNT */
 110                 CCNT(timer1);
 111         }
 112
 113         if (doRecive)
 114                 pos = corgi_ssp_ads7846_get();
 115
 116         if (doSend) {
 117                 int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
 118                 /* dummy command */
 119                 corgi_ssp_ads7846_put(cmd);
 120                 corgi_ssp_ads7846_get();
 121
 122                 if (dosleep) {
 123                         /* Wait after HSync */
 124                         CCNT(timer2);
 125                         if (timer2-timer1 > wait_time) {
 126                                 /* timeout */
 127                                 SyncHS();
 128                                 /* get OSCR */
 129                                 CCNT(timer1);
 130                                 /* Wait after HSync */
 131                                 CCNT(timer2);
 132                         }
 133                         while (timer2 - timer1 < wait_time)
 134                                 CCNT(timer2);
 135                 }
 136                 corgi_ssp_ads7846_put(cmd);
 137                 if (dosleep)
 138                         CCNT_OFF();
 139         }
 140         return pos;
 141 }
 142
 143 static int read_xydata(struct corgi_ts *corgi_ts)
 144 {
 145         unsigned int x, y, z1, z2;
 146         unsigned long flags, wait_time;
 147
 148         /* critical section */
 149         local_irq_save(flags);
 150         corgi_ssp_ads7846_lock();
 151         wait_time=calc_waittime();
 152
 153         /* Y-axis */
 154         sync_receive_data_send_cmd(0, 1, 1u, wait_time);
 155
 156         /* Y-axis */
 157         sync_receive_data_send_cmd(1, 1, 1u, wait_time);
 158
 159         /* X-axis */
 160         y = sync_receive_data_send_cmd(1, 1, 5u, wait_time);
 161
 162         /* Z1 */
 163         x = sync_receive_data_send_cmd(1, 1, 3u, wait_time);
 164
 165         /* Z2 */
 166         z1 = sync_receive_data_send_cmd(1, 1, 4u, wait_time);
 167         z2 = sync_receive_data_send_cmd(1, 0, 4u, wait_time);
 168
 169         /* Power-Down Enable */
 170         corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 171         corgi_ssp_ads7846_get();
 172
 173         corgi_ssp_ads7846_unlock();
 174         local_irq_restore(flags);
 175
 176         if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
 177                 corgi_ts->tc.pressure = 0;
 178                 return 0;
 179         }
 180
 181         corgi_ts->tc.x = x;
 182         corgi_ts->tc.y = y;
 183         corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
 184         return 1;
 185 }
 186
 187 static void new_data(struct corgi_ts *corgi_ts, struct pt_regs *regs)
 188 {
 189         if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
 190                 return;
 191
 192         if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
 193                 return;
 194
 195         if (regs)
 196                 input_regs(&corgi_ts->input, regs);
 197
 198         input_report_abs(&corgi_ts->input, ABS_X, corgi_ts->tc.x);
 199         input_report_abs(&corgi_ts->input, ABS_Y, corgi_ts->tc.y);
 200         input_report_abs(&corgi_ts->input, ABS_PRESSURE, corgi_ts->tc.pressure);
 201         input_report_key(&corgi_ts->input, BTN_TOUCH, (corgi_ts->pendown != 0));
 202         input_sync(&corgi_ts->input);
 203 }
 204
 205 static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer, struct pt_regs *regs)
 206 {
 207         if ((GPLR(CORGI_GPIO_TP_INT) & GPIO_bit(CORGI_GPIO_TP_INT)) == 0) {
 208                 /* Disable Interrupt */
 209                 set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_NOEDGE);
 210                 if (read_xydata(corgi_ts)) {
 211                         corgi_ts->pendown = 1;
 212                         new_data(corgi_ts, regs);
 213                 }
 214                 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
 215         } else {
 216                 if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
 217                         mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
 218                         corgi_ts->pendown++;
 219                         return;
 220                 }
 221
 222                 if (corgi_ts->pendown) {
 223                         corgi_ts->tc.pressure = 0;
 224                         new_data(corgi_ts, regs);
 225                 }
 226
 227                 /* Enable Falling Edge */
 228                 set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
 229                 corgi_ts->pendown = 0;
 230         }
 231 }
 232
 233 static void corgi_ts_timer(unsigned long data)
 234 {
 235         struct corgi_ts *corgits_data = (struct corgi_ts *) data;
 236         ts_interrupt_main(corgits_data, 1, NULL);
 237 }
 238
 239 static irqreturn_t ts_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 240 {
 241         struct corgi_ts *corgits_data = dev_id;
 242         ts_interrupt_main(corgits_data, 0, regs);
 243         return IRQ_HANDLED;
 244 }
 245
 246 #ifdef CONFIG_PM
 247 static int corgits_suspend(struct device *dev, uint32_t state, uint32_t level)
 248 {
 249         if (level == SUSPEND_POWER_DOWN) {
 250                 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
 251
 252                 if (corgi_ts->pendown) {
 253                         del_timer_sync(&corgi_ts->timer);
 254                         corgi_ts->tc.pressure = 0;
 255                         new_data(corgi_ts, NULL);
 256                         corgi_ts->pendown = 0;
 257                 }
 258                 corgi_ts->power_mode = PWR_MODE_SUSPEND;
 259
 260                 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 261         }
 262         return 0;
 263 }
 264
 265 static int corgits_resume(struct device *dev, uint32_t level)
 266 {
 267         if (level == RESUME_POWER_ON) {
 268                 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
 269
 270                 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
 271                 /* Enable Falling Edge */
 272                 set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
 273                 corgi_ts->power_mode = PWR_MODE_ACTIVE;
 274         }
 275         return 0;
 276 }
 277 #else
 278 #define corgits_suspend         NULL
 279 #define corgits_resume          NULL
 280 #endif
 281
 282 static int __init corgits_probe(struct device *dev)
 283 {
 284         struct corgi_ts *corgi_ts;
 285
 286         if (!(corgi_ts = kmalloc(sizeof(struct corgi_ts), GFP_KERNEL)))
 287                 return -ENOMEM;
 288
 289         dev_set_drvdata(dev, corgi_ts);
 290
 291         memset(corgi_ts, 0, sizeof(struct corgi_ts));
 292
 293         init_input_dev(&corgi_ts->input);
 294         corgi_ts->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 295         corgi_ts->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 296         input_set_abs_params(&corgi_ts->input, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
 297         input_set_abs_params(&corgi_ts->input, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
 298         input_set_abs_params(&corgi_ts->input, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
 299
 300         strcpy(corgi_ts->phys, "corgits/input0");
 301
 302         corgi_ts->input.private = corgi_ts;
 303         corgi_ts->input.name = "Corgi Touchscreen";
 304         corgi_ts->input.dev = dev;
 305         corgi_ts->input.phys = corgi_ts->phys;
 306         corgi_ts->input.id.bustype = BUS_HOST;
 307         corgi_ts->input.id.vendor = 0x0001;
 308         corgi_ts->input.id.product = 0x0002;
 309         corgi_ts->input.id.version = 0x0100;
 310
 311         pxa_gpio_mode(CORGI_GPIO_TP_INT | GPIO_IN);
 312         pxa_gpio_mode(CORGI_GPIO_HSYNC | 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         init_timer(&corgi_ts->timer);
 325         corgi_ts->timer.data = (unsigned long) corgi_ts;
 326         corgi_ts->timer.function = corgi_ts_timer;
 327
 328         input_register_device(&corgi_ts->input);
 329         corgi_ts->power_mode = PWR_MODE_ACTIVE;
 330
 331         if (request_irq(CORGI_IRQ_GPIO_TP_INT, ts_interrupt, SA_INTERRUPT, "ts", corgi_ts)) {
 332                 input_unregister_device(&corgi_ts->input);
 333                 kfree(corgi_ts);
 334                 return -EBUSY;
 335         }
 336
 337         /* Enable Falling Edge */
 338         set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
 339
 340         printk(KERN_INFO "input: Corgi Touchscreen Registered\n");
 341
 342         return 0;
 343 }
 344
 345 static int corgits_remove(struct device *dev)
 346 {
 347         struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
 348
 349         free_irq(CORGI_IRQ_GPIO_TP_INT, NULL);
 350         del_timer_sync(&corgi_ts->timer);
 351         input_unregister_device(&corgi_ts->input);
 352         kfree(corgi_ts);
 353         return 0;
 354 }
 355
 356 static struct device_driver corgits_driver = {
 357         .name           = "corgi-ts",
 358         .bus            = &platform_bus_type,
 359         .probe          = corgits_probe,
 360         .remove         = corgits_remove,
 361         .suspend        = corgits_suspend,
 362         .resume         = corgits_resume,
 363 };
 364
 365 static int __devinit corgits_init(void)
 366 {
 367         return driver_register(&corgits_driver);
 368 }
 369
 370 static void __exit corgits_exit(void)
 371 {
 372         driver_unregister(&corgits_driver);
 373 }
 374
 375 module_init(corgits_init);
 376 module_exit(corgits_exit);
 377
 378 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 379 MODULE_DESCRIPTION("Corgi TouchScreen Driver");
 380 MODULE_LICENSE("GPL");