2 * $Id: h3600_ts_input.c,v 1.4 2002/01/23 06:39:37 jsimmons Exp $
4 * Copyright (c) 2001 "Crazy" James Simmons jsimmons@transvirtual.com
6 * Sponsored by Transvirtual Technology.
8 * Derived from the code in h3600_ts.[ch] by Charles Flynn
12 * Driver for the h3600 Touch Screen and other Atmel controlled devices.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 * Should you need to contact me, the author, you can do so by
31 * e-mail - mail your message to <jsimmons@transvirtual.com>.
34 #include <linux/errno.h>
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/slab.h>
38 #include <linux/input.h>
39 #include <linux/serio.h>
40 #include <linux/init.h>
41 #include <linux/delay.h>
44 /* SA1100 serial defines */
45 #include <asm/arch/hardware.h>
46 #include <asm/arch/irqs.h>
48 #define DRIVER_DESC "H3600 touchscreen driver"
50 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_LICENSE("GPL");
55 * Definitions & global arrays.
58 /* The start and end of frame characters SOF and EOF */
61 #define FRAME_OVERHEAD 3 /* CHAR_SOF,CHAR_EOF,LENGTH = 3 */
64 Atmel events and response IDs contained in frame.
65 Programmer has no control over these numbers.
66 TODO there are holes - specifically 1,7,0x0a
68 #define VERSION_ID 0 /* Get Version (request/respose) */
69 #define KEYBD_ID 2 /* Keyboard (event) */
70 #define TOUCHS_ID 3 /* Touch Screen (event)*/
71 #define EEPROM_READ_ID 4 /* (request/response) */
72 #define EEPROM_WRITE_ID 5 /* (request/response) */
73 #define THERMAL_ID 6 /* (request/response) */
74 #define NOTIFY_LED_ID 8 /* (request/response) */
75 #define BATTERY_ID 9 /* (request/response) */
76 #define SPI_READ_ID 0x0b /* ( request/response) */
77 #define SPI_WRITE_ID 0x0c /* ( request/response) */
78 #define FLITE_ID 0x0d /* backlight ( request/response) */
79 #define STX_ID 0xa1 /* extension pack status (req/resp) */
83 #define H3600_MAX_LENGTH 16
86 #define H3600_SCANCODE_RECORD 1 /* 1 -> record button */
87 #define H3600_SCANCODE_CALENDAR 2 /* 2 -> calendar */
88 #define H3600_SCANCODE_CONTACTS 3 /* 3 -> contact */
89 #define H3600_SCANCODE_Q 4 /* 4 -> Q button */
90 #define H3600_SCANCODE_START 5 /* 5 -> start menu */
91 #define H3600_SCANCODE_UP 6 /* 6 -> up */
92 #define H3600_SCANCODE_RIGHT 7 /* 7 -> right */
93 #define H3600_SCANCODE_LEFT 8 /* 8 -> left */
94 #define H3600_SCANCODE_DOWN 9 /* 9 -> down */
96 static char *h3600_name = "H3600 TouchScreen";
99 * Per-touchscreen data.
102 struct input_dev dev;
104 unsigned char event; /* event ID from packet */
105 unsigned char chksum;
108 unsigned char buf[H3600_MAX_LENGTH];
112 static irqreturn_t action_button_handler(int irq, void *dev_id, struct pt_regs *regs)
114 int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1;
115 struct input_dev *dev = (struct input_dev *) dev_id;
117 input_regs(dev, regs);
118 input_report_key(dev, KEY_ENTER, down);
124 static irqreturn_t npower_button_handler(int irq, void *dev_id, struct pt_regs *regs)
126 int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1;
127 struct input_dev *dev = (struct input_dev *) dev_id;
130 * This interrupt is only called when we release the key. So we have
131 * to fake a key press.
133 input_regs(dev, regs);
134 input_report_key(dev, KEY_SUSPEND, 1);
135 input_report_key(dev, KEY_SUSPEND, down);
143 static int flite_brightness = 25;
151 * h3600_flite_power: enables or disables power to frontlight, using last bright */
152 unsigned int h3600_flite_power(struct input_dev *dev, enum flite_pwr pwr)
154 unsigned char brightness = (pwr == FLITE_PWR_OFF) ? 0 : flite_brightness;
155 struct h3600_dev *ts = dev->private;
157 /* Must be in this order */
158 ts->serio->write(ts->serio, 1);
159 ts->serio->write(ts->serio, pwr);
160 ts->serio->write(ts->serio, brightness);
164 static int suspended = 0;
165 static int h3600ts_pm_callback(struct pm_dev *pm_dev, pm_request_t req,
168 struct input_dev *dev = (struct input_dev *) data;
171 case PM_SUSPEND: /* enter D1-D3 */
173 h3600_flite_power(dev, FLITE_PWR_OFF);
177 h3600_flite_power(dev, FLITE_PWR_OFF);
179 case PM_RESUME: /* enter D0 */
180 /* same as unblank */
186 h3600_flite_power(dev, FLITE_PWR_ON);
194 * This function translates the native event packets to linux input event
195 * packets. Some packets coming from serial are not touchscreen related. In
196 * this case we send them off to be processed elsewhere.
198 static void h3600ts_process_packet(struct h3600_dev *ts, struct pt_regs *regs)
200 struct input_dev *dev = &ts->dev;
201 static int touched = 0;
204 input_regs(dev, regs);
208 Buttons - returned as a single byte
212 S switch state ( 0=pressed 1=released)
214 NNNN switch number 0-15
216 Note: This is true for non interrupt generated key events.
219 down = (ts->buf[0] & 0x80) ? 0 : 1;
221 switch (ts->buf[0] & 0x7f) {
222 case H3600_SCANCODE_RECORD:
225 case H3600_SCANCODE_CALENDAR:
228 case H3600_SCANCODE_CONTACTS:
231 case H3600_SCANCODE_Q:
234 case H3600_SCANCODE_START:
237 case H3600_SCANCODE_UP:
240 case H3600_SCANCODE_RIGHT:
243 case H3600_SCANCODE_LEFT:
246 case H3600_SCANCODE_DOWN:
253 input_report_key(dev, key, down);
256 * Native touchscreen event data is formatted as shown below:-
258 * +-------+-------+-------+-------+
259 * | Xmsb | Xlsb | Ymsb | Ylsb |
260 * +-------+-------+-------+-------+
265 input_report_key(dev, BTN_TOUCH, 1);
272 x = ts->buf[0]; x <<= 8; x += ts->buf[1];
273 y = ts->buf[2]; y <<= 8; y += ts->buf[3];
275 input_report_abs(dev, ABS_X, x);
276 input_report_abs(dev, ABS_Y, y);
278 input_report_key(dev, BTN_TOUCH, 0);
283 /* Send a non input event elsewhere */
291 * h3600ts_event() handles events from the input module.
293 static int h3600ts_event(struct input_dev *dev, unsigned int type,
294 unsigned int code, int value)
296 struct h3600_dev *ts = dev->private;
300 // ts->serio->write(ts->serio, SOME_CMD);
310 +-------+---------------+---------------+--=------------+
311 |SOF |id |len | len bytes | Chksum |
312 +-------+---------------+---------------+--=------------+
313 bit 0 7 8 11 12 15 16
315 +-------+---------------+-------+
316 |SOF |id |0 |Chksum | - Note Chksum does not include SOF
317 +-------+---------------+-------+
318 bit 0 7 8 11 12 15 16
325 #define STATE_SOF 0 /* start of FRAME */
326 #define STATE_ID 1 /* state where we decode the ID & len */
327 #define STATE_DATA 2 /* state where we decode data */
328 #define STATE_EOF 3 /* state where we decode checksum or EOF */
330 static irqreturn_t h3600ts_interrupt(struct serio *serio, unsigned char data,
331 unsigned int flags, struct pt_regs *regs)
333 struct h3600_dev *ts = serio->private;
336 * We have a new frame coming in.
340 if (data == CHAR_SOF)
344 ts->event = (data & 0xf0) >> 4;
345 ts->len = (data & 0xf);
347 if (ts->event >= MAX_ID) {
352 state = (ts->len > 0) ? STATE_DATA : STATE_EOF;
356 ts->buf[ts->idx]= data;
357 if(++ts->idx == ts->len)
362 if (data == CHAR_EOF || data == ts->chksum)
363 h3600ts_process_packet(ts, regs);
374 * h3600ts_connect() is the routine that is called when someone adds a
375 * new serio device. It looks whether it was registered as a H3600 touchscreen
376 * and if yes, registers it as an input device.
378 static void h3600ts_connect(struct serio *serio, struct serio_driver *drv)
380 struct h3600_dev *ts;
382 if (serio->type != (SERIO_RS232 | SERIO_H3600))
385 if (!(ts = kmalloc(sizeof(struct h3600_dev), GFP_KERNEL)))
388 memset(ts, 0, sizeof(struct h3600_dev));
390 init_input_dev(&ts->dev);
392 /* Device specific stuff */
393 set_GPIO_IRQ_edge(GPIO_BITSY_ACTION_BUTTON, GPIO_BOTH_EDGES);
394 set_GPIO_IRQ_edge(GPIO_BITSY_NPOWER_BUTTON, GPIO_RISING_EDGE);
396 if (request_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, action_button_handler,
397 SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
398 "h3600_action", &ts->dev)) {
399 printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n");
404 if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler,
405 SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
406 "h3600_suspend", &ts->dev)) {
407 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
408 printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n");
413 /* Now we have things going we setup our input device */
414 ts->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_LED) | BIT(EV_PWR);
415 ts->dev.ledbit[0] = BIT(LED_SLEEP);
416 input_set_abs_params(&ts->dev, ABS_X, 60, 985, 0, 0);
417 input_set_abs_params(&ts->dev, ABS_Y, 35, 1024, 0, 0);
419 set_bit(KEY_RECORD, ts->dev.keybit);
420 set_bit(KEY_Q, ts->dev.keybit);
421 set_bit(KEY_PROG1, ts->dev.keybit);
422 set_bit(KEY_PROG2, ts->dev.keybit);
423 set_bit(KEY_PROG3, ts->dev.keybit);
424 set_bit(KEY_UP, ts->dev.keybit);
425 set_bit(KEY_RIGHT, ts->dev.keybit);
426 set_bit(KEY_LEFT, ts->dev.keybit);
427 set_bit(KEY_DOWN, ts->dev.keybit);
428 set_bit(KEY_ENTER, ts->dev.keybit);
429 ts->dev.keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
430 ts->dev.keybit[LONG(KEY_SUSPEND)] |= BIT(KEY_SUSPEND);
435 sprintf(ts->phys, "%s/input0", serio->phys);
437 ts->dev.event = h3600ts_event;
438 ts->dev.private = ts;
439 ts->dev.name = h3600_name;
440 ts->dev.phys = ts->phys;
441 ts->dev.id.bustype = BUS_RS232;
442 ts->dev.id.vendor = SERIO_H3600;
443 ts->dev.id.product = 0x0666; /* FIXME !!! We can ask the hardware */
444 ts->dev.id.version = 0x0100;
446 if (serio_open(serio, drv)) {
447 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts);
448 free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts);
453 //h3600_flite_control(1, 25); /* default brightness */
455 ts->dev.pm_dev = pm_register(PM_ILLUMINATION_DEV, PM_SYS_LIGHT,
456 h3600ts_pm_callback);
457 printk("registered pm callback\n");
459 input_register_device(&ts->dev);
461 printk(KERN_INFO "input: %s on %s\n", h3600_name, serio->phys);
465 * h3600ts_disconnect() is the opposite of h3600ts_connect()
468 static void h3600ts_disconnect(struct serio *serio)
470 struct h3600_dev *ts = serio->private;
472 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
473 free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, &ts->dev);
474 input_unregister_device(&ts->dev);
480 * The serio device structure.
483 static struct serio_driver h3600ts_drv = {
487 .description = DRIVER_DESC,
488 .interrupt = h3600ts_interrupt,
489 .connect = h3600ts_connect,
490 .disconnect = h3600ts_disconnect,
494 * The functions for inserting/removing us as a module.
497 static int __init h3600ts_init(void)
499 serio_register_driver(&h3600ts_drv);
503 static void __exit h3600ts_exit(void)
505 serio_unregister_driver(&h3600ts_drv);
508 module_init(h3600ts_init);
509 module_exit(h3600ts_exit);