491 lines
13 KiB
C
491 lines
13 KiB
C
/*
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* Copyright (c) 2001 "Crazy" James Simmons jsimmons@transvirtual.com
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*
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* Sponsored by Transvirtual Technology.
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*
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* Derived from the code in h3600_ts.[ch] by Charles Flynn
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*/
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/*
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* Driver for the h3600 Touch Screen and other Atmel controlled devices.
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so by
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* e-mail - mail your message to <jsimmons@transvirtual.com>.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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/* SA1100 serial defines */
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#include <mach/hardware.h>
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#include <mach/irqs.h>
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#define DRIVER_DESC "H3600 touchscreen driver"
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MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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* Definitions & global arrays.
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*/
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/* The start and end of frame characters SOF and EOF */
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#define CHAR_SOF 0x02
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#define CHAR_EOF 0x03
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#define FRAME_OVERHEAD 3 /* CHAR_SOF,CHAR_EOF,LENGTH = 3 */
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/*
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Atmel events and response IDs contained in frame.
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Programmer has no control over these numbers.
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TODO there are holes - specifically 1,7,0x0a
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*/
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#define VERSION_ID 0 /* Get Version (request/respose) */
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#define KEYBD_ID 2 /* Keyboard (event) */
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#define TOUCHS_ID 3 /* Touch Screen (event)*/
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#define EEPROM_READ_ID 4 /* (request/response) */
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#define EEPROM_WRITE_ID 5 /* (request/response) */
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#define THERMAL_ID 6 /* (request/response) */
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#define NOTIFY_LED_ID 8 /* (request/response) */
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#define BATTERY_ID 9 /* (request/response) */
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#define SPI_READ_ID 0x0b /* ( request/response) */
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#define SPI_WRITE_ID 0x0c /* ( request/response) */
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#define FLITE_ID 0x0d /* backlight ( request/response) */
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#define STX_ID 0xa1 /* extension pack status (req/resp) */
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#define MAX_ID 14
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#define H3600_MAX_LENGTH 16
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#define H3600_KEY 0xf
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#define H3600_SCANCODE_RECORD 1 /* 1 -> record button */
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#define H3600_SCANCODE_CALENDAR 2 /* 2 -> calendar */
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#define H3600_SCANCODE_CONTACTS 3 /* 3 -> contact */
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#define H3600_SCANCODE_Q 4 /* 4 -> Q button */
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#define H3600_SCANCODE_START 5 /* 5 -> start menu */
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#define H3600_SCANCODE_UP 6 /* 6 -> up */
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#define H3600_SCANCODE_RIGHT 7 /* 7 -> right */
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#define H3600_SCANCODE_LEFT 8 /* 8 -> left */
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#define H3600_SCANCODE_DOWN 9 /* 9 -> down */
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/*
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* Per-touchscreen data.
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*/
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struct h3600_dev {
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struct input_dev *dev;
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struct serio *serio;
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unsigned char event; /* event ID from packet */
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unsigned char chksum;
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unsigned char len;
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unsigned char idx;
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unsigned char buf[H3600_MAX_LENGTH];
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char phys[32];
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};
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static irqreturn_t action_button_handler(int irq, void *dev_id)
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{
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int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1;
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struct input_dev *dev = dev_id;
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input_report_key(dev, KEY_ENTER, down);
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input_sync(dev);
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return IRQ_HANDLED;
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}
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static irqreturn_t npower_button_handler(int irq, void *dev_id)
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{
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int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1;
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struct input_dev *dev = dev_id;
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/*
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* This interrupt is only called when we release the key. So we have
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* to fake a key press.
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*/
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input_report_key(dev, KEY_SUSPEND, 1);
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input_report_key(dev, KEY_SUSPEND, down);
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input_sync(dev);
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_PM
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static int flite_brightness = 25;
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enum flite_pwr {
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FLITE_PWR_OFF = 0,
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FLITE_PWR_ON = 1
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};
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/*
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* h3600_flite_power: enables or disables power to frontlight, using last bright */
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unsigned int h3600_flite_power(struct input_dev *dev, enum flite_pwr pwr)
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{
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unsigned char brightness = (pwr == FLITE_PWR_OFF) ? 0 : flite_brightness;
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struct h3600_dev *ts = input_get_drvdata(dev);
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/* Must be in this order */
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serio_write(ts->serio, 1);
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serio_write(ts->serio, pwr);
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serio_write(ts->serio, brightness);
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return 0;
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}
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#endif
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/*
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* This function translates the native event packets to linux input event
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* packets. Some packets coming from serial are not touchscreen related. In
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* this case we send them off to be processed elsewhere.
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*/
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static void h3600ts_process_packet(struct h3600_dev *ts)
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{
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struct input_dev *dev = ts->dev;
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static int touched = 0;
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int key, down = 0;
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switch (ts->event) {
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/*
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Buttons - returned as a single byte
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7 6 5 4 3 2 1 0
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S x x x N N N N
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S switch state ( 0=pressed 1=released)
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x Unused.
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NNNN switch number 0-15
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Note: This is true for non interrupt generated key events.
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*/
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case KEYBD_ID:
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down = (ts->buf[0] & 0x80) ? 0 : 1;
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switch (ts->buf[0] & 0x7f) {
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case H3600_SCANCODE_RECORD:
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key = KEY_RECORD;
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break;
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case H3600_SCANCODE_CALENDAR:
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key = KEY_PROG1;
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break;
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case H3600_SCANCODE_CONTACTS:
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key = KEY_PROG2;
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break;
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case H3600_SCANCODE_Q:
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key = KEY_Q;
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break;
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case H3600_SCANCODE_START:
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key = KEY_PROG3;
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break;
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case H3600_SCANCODE_UP:
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key = KEY_UP;
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break;
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case H3600_SCANCODE_RIGHT:
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key = KEY_RIGHT;
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break;
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case H3600_SCANCODE_LEFT:
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key = KEY_LEFT;
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break;
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case H3600_SCANCODE_DOWN:
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key = KEY_DOWN;
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break;
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default:
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key = 0;
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}
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if (key)
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input_report_key(dev, key, down);
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break;
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/*
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* Native touchscreen event data is formatted as shown below:-
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*
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* +-------+-------+-------+-------+
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* | Xmsb | Xlsb | Ymsb | Ylsb |
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* +-------+-------+-------+-------+
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* byte 0 1 2 3
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*/
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case TOUCHS_ID:
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if (!touched) {
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input_report_key(dev, BTN_TOUCH, 1);
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touched = 1;
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}
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if (ts->len) {
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unsigned short x, y;
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x = ts->buf[0]; x <<= 8; x += ts->buf[1];
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y = ts->buf[2]; y <<= 8; y += ts->buf[3];
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input_report_abs(dev, ABS_X, x);
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input_report_abs(dev, ABS_Y, y);
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} else {
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input_report_key(dev, BTN_TOUCH, 0);
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touched = 0;
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}
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break;
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default:
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/* Send a non input event elsewhere */
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break;
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}
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input_sync(dev);
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}
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/*
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* h3600ts_event() handles events from the input module.
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*/
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static int h3600ts_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int value)
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{
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#if 0
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struct h3600_dev *ts = input_get_drvdata(dev);
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switch (type) {
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case EV_LED: {
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// serio_write(ts->serio, SOME_CMD);
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return 0;
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}
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}
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return -1;
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#endif
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return 0;
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}
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/*
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Frame format
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byte 1 2 3 len + 4
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+-------+---------------+---------------+--=------------+
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|SOF |id |len | len bytes | Chksum |
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+-------+---------------+---------------+--=------------+
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bit 0 7 8 11 12 15 16
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+-------+---------------+-------+
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|SOF |id |0 |Chksum | - Note Chksum does not include SOF
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+-------+---------------+-------+
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bit 0 7 8 11 12 15 16
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*/
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static int state;
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/* decode States */
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#define STATE_SOF 0 /* start of FRAME */
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#define STATE_ID 1 /* state where we decode the ID & len */
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#define STATE_DATA 2 /* state where we decode data */
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#define STATE_EOF 3 /* state where we decode checksum or EOF */
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static irqreturn_t h3600ts_interrupt(struct serio *serio, unsigned char data,
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unsigned int flags)
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{
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struct h3600_dev *ts = serio_get_drvdata(serio);
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/*
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* We have a new frame coming in.
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*/
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switch (state) {
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case STATE_SOF:
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if (data == CHAR_SOF)
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state = STATE_ID;
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break;
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case STATE_ID:
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ts->event = (data & 0xf0) >> 4;
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ts->len = (data & 0xf);
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ts->idx = 0;
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if (ts->event >= MAX_ID) {
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state = STATE_SOF;
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break;
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}
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ts->chksum = data;
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state = (ts->len > 0) ? STATE_DATA : STATE_EOF;
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break;
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case STATE_DATA:
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ts->chksum += data;
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ts->buf[ts->idx]= data;
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if (++ts->idx == ts->len)
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state = STATE_EOF;
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break;
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case STATE_EOF:
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state = STATE_SOF;
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if (data == CHAR_EOF || data == ts->chksum)
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h3600ts_process_packet(ts);
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break;
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default:
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printk("Error3\n");
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break;
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}
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return IRQ_HANDLED;
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}
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/*
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* h3600ts_connect() is the routine that is called when someone adds a
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* new serio device that supports H3600 protocol and registers it as
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* an input device.
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*/
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static int h3600ts_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct h3600_dev *ts;
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struct input_dev *input_dev;
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int err;
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ts = kzalloc(sizeof(struct h3600_dev), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!ts || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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ts->serio = serio;
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ts->dev = input_dev;
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snprintf(ts->phys, sizeof(ts->phys), "%s/input0", serio->phys);
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input_dev->name = "H3600 TouchScreen";
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input_dev->phys = ts->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_H3600;
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input_dev->id.product = 0x0666; /* FIXME !!! We can ask the hardware */
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &serio->dev;
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input_set_drvdata(input_dev, ts);
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input_dev->event = h3600ts_event;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) |
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BIT_MASK(EV_LED) | BIT_MASK(EV_PWR);
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input_dev->ledbit[0] = BIT_MASK(LED_SLEEP);
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input_set_abs_params(input_dev, ABS_X, 60, 985, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 35, 1024, 0, 0);
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set_bit(KEY_RECORD, input_dev->keybit);
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set_bit(KEY_Q, input_dev->keybit);
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set_bit(KEY_PROG1, input_dev->keybit);
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set_bit(KEY_PROG2, input_dev->keybit);
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set_bit(KEY_PROG3, input_dev->keybit);
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set_bit(KEY_UP, input_dev->keybit);
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set_bit(KEY_RIGHT, input_dev->keybit);
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set_bit(KEY_LEFT, input_dev->keybit);
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set_bit(KEY_DOWN, input_dev->keybit);
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set_bit(KEY_ENTER, input_dev->keybit);
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set_bit(KEY_SUSPEND, input_dev->keybit);
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set_bit(BTN_TOUCH, input_dev->keybit);
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/* Device specific stuff */
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set_GPIO_IRQ_edge(GPIO_BITSY_ACTION_BUTTON, GPIO_BOTH_EDGES);
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set_GPIO_IRQ_edge(GPIO_BITSY_NPOWER_BUTTON, GPIO_RISING_EDGE);
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if (request_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, action_button_handler,
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IRQF_SHARED | IRQF_DISABLED, "h3600_action", &ts->dev)) {
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printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n");
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err = -EBUSY;
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goto fail2;
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}
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if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler,
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IRQF_SHARED | IRQF_DISABLED, "h3600_suspend", &ts->dev)) {
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printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n");
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err = -EBUSY;
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goto fail3;
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}
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serio_set_drvdata(serio, ts);
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err = serio_open(serio, drv);
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if (err)
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return err;
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//h3600_flite_control(1, 25); /* default brightness */
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input_register_device(ts->dev);
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return 0;
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fail3: free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts->dev);
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fail2: free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts->dev);
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fail1: serio_set_drvdata(serio, NULL);
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input_free_device(input_dev);
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kfree(ts);
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return err;
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}
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/*
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* h3600ts_disconnect() is the opposite of h3600ts_connect()
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*/
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static void h3600ts_disconnect(struct serio *serio)
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{
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struct h3600_dev *ts = serio_get_drvdata(serio);
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free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
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free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, &ts->dev);
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input_get_device(ts->dev);
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input_unregister_device(ts->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(ts->dev);
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kfree(ts);
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}
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/*
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* The serio driver structure.
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*/
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static struct serio_device_id h3600ts_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_H3600,
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.id = SERIO_ANY,
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.extra = SERIO_ANY,
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},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(serio, h3600ts_serio_ids);
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static struct serio_driver h3600ts_drv = {
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.driver = {
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.name = "h3600ts",
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},
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.description = DRIVER_DESC,
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.id_table = h3600ts_serio_ids,
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.interrupt = h3600ts_interrupt,
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.connect = h3600ts_connect,
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.disconnect = h3600ts_disconnect,
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};
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/*
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* The functions for inserting/removing us as a module.
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*/
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static int __init h3600ts_init(void)
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{
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return serio_register_driver(&h3600ts_drv);
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}
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static void __exit h3600ts_exit(void)
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{
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serio_unregister_driver(&h3600ts_drv);
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}
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module_init(h3600ts_init);
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module_exit(h3600ts_exit);
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