--- /dev/null
+/*
+ * $Id: h3600_ts_input.c,v 1.4 2002/01/23 06:39:37 jsimmons Exp $
+ *
+ * Copyright (c) 2001 "Crazy" James Simmons jsimmons@transvirtual.com
+ *
+ * Sponsored by Transvirtual Technology.
+ *
+ * Derived from the code in h3600_ts.[ch] by Charles Flynn
+ */
+
+/*
+ * Driver for the h3600 Touch Screen and other Atmel controlled devices.
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Should you need to contact me, the author, you can do so by
+ * e-mail - mail your message to <jsimmons@transvirtual.com>.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+
+/* SA1100 serial defines */
+#include <asm/arch/hardware.h>
+#include <asm/arch/irqs.h>
+
+/*
+ * Definitions & global arrays.
+ */
+
+/* The start and end of frame characters SOF and EOF */
+#define CHAR_SOF 0x02
+#define CHAR_EOF 0x03
+#define FRAME_OVERHEAD 3 /* CHAR_SOF,CHAR_EOF,LENGTH = 3 */
+
+/*
+ Atmel events and response IDs contained in frame.
+ Programmer has no control over these numbers.
+ TODO there are holes - specifically 1,7,0x0a
+*/
+#define VERSION_ID 0 /* Get Version (request/respose) */
+#define KEYBD_ID 2 /* Keyboard (event) */
+#define TOUCHS_ID 3 /* Touch Screen (event)*/
+#define EEPROM_READ_ID 4 /* (request/response) */
+#define EEPROM_WRITE_ID 5 /* (request/response) */
+#define THERMAL_ID 6 /* (request/response) */
+#define NOTIFY_LED_ID 8 /* (request/response) */
+#define BATTERY_ID 9 /* (request/response) */
+#define SPI_READ_ID 0x0b /* ( request/response) */
+#define SPI_WRITE_ID 0x0c /* ( request/response) */
+#define FLITE_ID 0x0d /* backlight ( request/response) */
+#define STX_ID 0xa1 /* extension pack status (req/resp) */
+
+#define MAX_ID 14
+
+#define H3600_MAX_LENGTH 16
+#define H3600_KEY 0xf
+
+#define H3600_SCANCODE_RECORD 1 /* 1 -> record button */
+#define H3600_SCANCODE_CALENDAR 2 /* 2 -> calendar */
+#define H3600_SCANCODE_CONTACTS 3 /* 3 -> contact */
+#define H3600_SCANCODE_Q 4 /* 4 -> Q button */
+#define H3600_SCANCODE_START 5 /* 5 -> start menu */
+#define H3600_SCANCODE_UP 6 /* 6 -> up */
+#define H3600_SCANCODE_RIGHT 7 /* 7 -> right */
+#define H3600_SCANCODE_LEFT 8 /* 8 -> left */
+#define H3600_SCANCODE_DOWN 9 /* 9 -> down */
+
+static char *h3600_name = "H3600 TouchScreen";
+
+/*
+ * Per-touchscreen data.
+ */
+struct h3600_dev {
+ struct input_dev dev;
+ struct serio *serio;
+ unsigned char event; /* event ID from packet */
+ unsigned char chksum;
+ unsigned char len;
+ unsigned char idx;
+ unsigned char buf[H3600_MAX_LENGTH];
+ char phys[32];
+};
+
+static void action_button_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1;
+ struct input_dev *dev = (struct input_dev *) dev_id;
+
+ input_report_key(dev, KEY_ENTER, down);
+}
+
+static void npower_button_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1;
+ struct input_dev *dev = (struct input_dev *) dev_id;
+
+ /*
+ * This interrupt is only called when we release the key. So we have
+ * to fake a key press.
+ */
+ input_report_key(dev, KEY_SUSPEND, 1);
+ input_report_key(dev, KEY_SUSPEND, down);
+}
+
+#ifdef CONFIG_PM
+
+static int flite_brightness = 25;
+
+enum flite_pwr {
+ FLITE_PWR_OFF = 0,
+ FLITE_PWR_ON = 1
+};
+
+/*
+ * h3600_flite_power: enables or disables power to frontlight, using last bright */
+unsigned int h3600_flite_power(struct input_dev *dev, enum flite_pwr pwr)
+{
+ unsigned char brightness = ((pwr==FLITE_PWR_OFF) ? 0:flite_brightness);
+ struct h3600_dev *ts = dev->private;
+
+ /* Must be in this order */
+ ts->serio->write(ts->serio, 1);
+ ts->serio->write(ts->serio, pwr);
+ ts->serio->write(ts->serio, brightness);
+ return 0;
+}
+
+static int suspended = 0;
+static int h3600ts_pm_callback(struct pm_dev *pm_dev, pm_request_t req,
+ void *data)
+{
+ struct input_dev *dev = (struct input_dev *) data;
+
+ switch (req) {
+ case PM_SUSPEND: /* enter D1-D3 */
+ suspended = 1;
+ h3600_flite_power(dev, FLITE_PWR_OFF);
+ break;
+ case PM_BLANK:
+ if (!suspended)
+ h3600_flite_power(dev, FLITE_PWR_OFF);
+ break;
+ case PM_RESUME: /* enter D0 */
+ /* same as unblank */
+ case PM_UNBLANK:
+ if (suspended) {
+ //initSerial();
+ suspended = 0;
+ }
+ h3600_flite_power(dev, FLITE_PWR_ON);
+ break;
+ }
+ return 0;
+}
+#endif
+
+/*
+ * This function translates the native event packets to linux input event
+ * packets. Some packets coming from serial are not touchscreen related. In
+ * this case we send them off to be processed elsewhere.
+ */
+static void h3600ts_process_packet(struct h3600_dev *ts)
+{
+ struct input_dev *dev = &ts->dev;
+ static int touched = 0;
+ int key, down = 0;
+
+ switch (ts->event) {
+ /*
+ Buttons - returned as a single byte
+ 7 6 5 4 3 2 1 0
+ S x x x N N N N
+
+ S switch state ( 0=pressed 1=released)
+ x Unused.
+ NNNN switch number 0-15
+
+ Note: This is true for non interrupt generated key events.
+ */
+ case KEYBD_ID:
+ down = (ts->buf[0] & 0x80) ? 0 : 1;
+
+ switch (ts->buf[0] & 0x7f) {
+ case H3600_SCANCODE_RECORD:
+ key = KEY_RECORD;
+ break;
+ case H3600_SCANCODE_CALENDAR:
+ key = KEY_PROG1;
+ break;
+ case H3600_SCANCODE_CONTACTS:
+ key = KEY_PROG2;
+ break;
+ case H3600_SCANCODE_Q:
+ key = KEY_Q;
+ break;
+ case H3600_SCANCODE_START:
+ key = KEY_PROG3;
+ break;
+ case H3600_SCANCODE_UP:
+ key = KEY_UP;
+ break;
+ case H3600_SCANCODE_RIGHT:
+ key = KEY_RIGHT;
+ break;
+ case H3600_SCANCODE_LEFT:
+ key = KEY_LEFT;
+ break;
+ case H3600_SCANCODE_DOWN:
+ key = KEY_DOWN;
+ break;
+ default:
+ key = 0;
+ }
+ if (key)
+ input_report_key(dev, key, down);
+ break;
+ /*
+ * Native touchscreen event data is formatted as shown below:-
+ *
+ * +-------+-------+-------+-------+
+ * | Xmsb | Xlsb | Ymsb | Ylsb |
+ * +-------+-------+-------+-------+
+ * byte 0 1 2 3
+ */
+ case TOUCHS_ID:
+ if (!touched) {
+ input_report_key(dev, BTN_TOUCH, 1);
+ touched = 1;
+ }
+
+ if (ts->len) {
+ unsigned short x, y;
+
+ x = ts->buf[0]; x <<= 8; x += ts->buf[1];
+ y = ts->buf[2]; y <<= 8; y += ts->buf[3];
+
+ input_report_abs(dev, ABS_X, x);
+ input_report_abs(dev, ABS_Y, y);
+ } else {
+ input_report_key(dev, BTN_TOUCH, 0);
+ touched = 0;
+ }
+ break;
+ default:
+ /* Send a non input event elsewhere */
+ break;
+ }
+}
+
+/*
+ * h3600ts_event() handles events from the input module.
+ */
+static int h3600ts_event(struct input_dev *dev, unsigned int type,
+ unsigned int code, int value)
+{
+ struct h3600_dev *ts = dev->private;
+
+ switch (type) {
+ case EV_LED: {
+ // ts->serio->write(ts->serio, SOME_CMD);
+ return 0;
+ }
+ }
+ return -1;
+}
+
+/*
+ Frame format
+ byte 1 2 3 len + 4
+ +-------+---------------+---------------+--=------------+
+ |SOF |id |len | len bytes | Chksum |
+ +-------+---------------+---------------+--=------------+
+ bit 0 7 8 11 12 15 16
+
+ +-------+---------------+-------+
+ |SOF |id |0 |Chksum | - Note Chksum does not include SOF
+ +-------+---------------+-------+
+ bit 0 7 8 11 12 15 16
+
+*/
+
+static int state;
+
+/* decode States */
+#define STATE_SOF 0 /* start of FRAME */
+#define STATE_ID 1 /* state where we decode the ID & len */
+#define STATE_DATA 2 /* state where we decode data */
+#define STATE_EOF 3 /* state where we decode checksum or EOF */
+
+static void h3600ts_interrupt(struct serio *serio, unsigned char data,
+ unsigned int flags)
+{
+ struct h3600_dev *ts = serio->private;
+
+ /*
+ * We have a new frame coming in.
+ */
+ switch (state) {
+ case STATE_SOF:
+ if (data == CHAR_SOF)
+ state = STATE_ID;
+ return;
+ case STATE_ID:
+ ts->event = (data & 0xf0) >> 4;
+ ts->len = (data & 0xf);
+ ts->idx = 0;
+ if (ts->event >= MAX_ID) {
+ state = STATE_SOF;
+ break;
+ }
+ ts->chksum = data;
+ state=(ts->len > 0 ) ? STATE_DATA : STATE_EOF;
+ break;
+ case STATE_DATA:
+ ts->chksum += data;
+ ts->buf[ts->idx]= data;
+ if(++ts->idx == ts->len)
+ state = STATE_EOF;
+ break;
+ case STATE_EOF:
+ state = STATE_SOF;
+ if (data == CHAR_EOF || data == ts->chksum )
+ h3600ts_process_packet(ts);
+ break;
+ default:
+ printk("Error3\n");
+ break;
+ }
+}
+
+/*
+ * h3600ts_connect() is the routine that is called when someone adds a
+ * new serio device. It looks whether it was registered as a H3600 touchscreen
+ * and if yes, registers it as an input device.
+ */
+static void h3600ts_connect(struct serio *serio, struct serio_dev *dev)
+{
+ struct h3600_dev *ts;
+
+ if (serio->type != (SERIO_RS232 | SERIO_H3600))
+ return;
+
+ if (!(ts = kmalloc(sizeof(struct h3600_dev), GFP_KERNEL)))
+ return;
+
+ memset(ts, 0, sizeof(struct h3600_dev));
+
+ /* Device specific stuff */
+ set_GPIO_IRQ_edge( GPIO_BITSY_ACTION_BUTTON, GPIO_BOTH_EDGES );
+ set_GPIO_IRQ_edge( GPIO_BITSY_NPOWER_BUTTON, GPIO_RISING_EDGE );
+
+ if (request_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, action_button_handler,
+ SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
+ "h3600_action", &ts->dev)) {
+ printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n");
+ kfree(ts);
+ return;
+ }
+
+ if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler,
+ SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
+ "h3600_suspend", &ts->dev)) {
+ free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
+ printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n");
+ kfree(ts);
+ return;
+ }
+ /* Now we have things going we setup our input device */
+ ts->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_LED) | BIT(EV_PWR);
+ ts->dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
+ ts->dev.ledbit[0] = BIT(LED_SLEEP);
+
+ ts->dev.absmin[ABS_X] = 60; ts->dev.absmin[ABS_Y] = 35;
+ ts->dev.absmax[ABS_X] = 985; ts->dev.absmax[ABS_Y] = 1024;
+ ts->dev.absfuzz[ABS_X] = 0; ts->dev.absfuzz[ABS_Y] = 0;
+
+ ts->serio = serio;
+ serio->private = ts;
+
+ set_bit(KEY_RECORD, ts->dev.keybit);
+ set_bit(KEY_Q, ts->dev.keybit);
+ set_bit(KEY_PROG1, ts->dev.keybit);
+ set_bit(KEY_PROG2, ts->dev.keybit);
+ set_bit(KEY_PROG3, ts->dev.keybit);
+ set_bit(KEY_UP, ts->dev.keybit);
+ set_bit(KEY_RIGHT, ts->dev.keybit);
+ set_bit(KEY_LEFT, ts->dev.keybit);
+ set_bit(KEY_DOWN, ts->dev.keybit);
+ set_bit(KEY_ENTER, ts->dev.keybit);
+ ts->dev.keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
+ ts->dev.keybit[LONG(KEY_SUSPEND)] |= BIT(KEY_SUSPEND);
+
+ sprintf(ts->phys, "%s/input0", serio->phys);
+
+ ts->dev.event = h3600ts_event;
+ ts->dev.private = ts;
+ ts->dev.name = h3600_name;
+ ts->dev.phys = ts->phys;
+ ts->dev.idbus = BUS_RS232;
+ ts->dev.idvendor = SERIO_H3600;
+ ts->dev.idproduct = 0x0666; /* FIXME !!! We can ask the hardware */
+ ts->dev.idversion = 0x0100;
+
+ if (serio_open(serio, dev)) {
+ free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts);
+ free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts);
+ kfree(ts);
+ return;
+ }
+
+ //h3600_flite_control(1, 25); /* default brightness */
+#ifdef CONFIG_PM
+ ts->dev.pm_dev = pm_register(PM_ILLUMINATION_DEV, PM_SYS_LIGHT,
+ h3600ts_pm_callback);
+ printk("registered pm callback\n");
+#endif
+ input_register_device(&ts->dev);
+
+ printk(KERN_INFO "input: %s on %s\n", h3600_name, serio->phys);
+}
+
+/*
+ * h3600ts_disconnect() is the opposite of h3600ts_connect()
+ */
+
+static void h3600ts_disconnect(struct serio *serio)
+{
+ struct h3600_dev *ts = serio->private;
+
+ free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
+ free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, &ts->dev);
+ input_unregister_device(&ts->dev);
+ serio_close(serio);
+ kfree(ts);
+}
+
+/*
+ * The serio device structure.
+ */
+
+static struct serio_dev h3600ts_dev = {
+ interrupt: h3600ts_interrupt,
+ connect: h3600ts_connect,
+ disconnect: h3600ts_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init h3600ts_init(void)
+{
+ serio_register_device(&h3600ts_dev);
+ return 0;
+}
+
+static void __exit h3600ts_exit(void)
+{
+ serio_unregister_device(&h3600ts_dev);
+}
+
+module_init(h3600ts_init);
+module_exit(h3600ts_exit);
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