/* * 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> /* SA1100 serial defines */ #include <mach/hardware.h> #include <mach/irqs.h> #define DRIVER_DESC "H3600 touchscreen driver" MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>"); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); /* * 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 */ /* * 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 irqreturn_t action_button_handler(int irq, void *dev_id) { int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1; struct input_dev *dev = dev_id; input_report_key(dev, KEY_ENTER, down); input_sync(dev); return IRQ_HANDLED; } static irqreturn_t npower_button_handler(int irq, void *dev_id) { int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1; struct input_dev *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); input_sync(dev); return IRQ_HANDLED; } #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 = input_get_drvdata(dev); /* Must be in this order */ serio_write(ts->serio, 1); serio_write(ts->serio, pwr); serio_write(ts->serio, brightness); 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; } input_sync(dev); } /* * h3600ts_event() handles events from the input module. */ static int h3600ts_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) { #if 0 struct h3600_dev *ts = input_get_drvdata(dev); switch (type) { case EV_LED: { // serio_write(ts->serio, SOME_CMD); return 0; } } return -1; #endif return 0; } /* 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 irqreturn_t h3600ts_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct h3600_dev *ts = serio_get_drvdata(serio); /* * We have a new frame coming in. */ switch (state) { case STATE_SOF: if (data == CHAR_SOF) state = STATE_ID; break; 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; } return IRQ_HANDLED; } /* * h3600ts_connect() is the routine that is called when someone adds a * new serio device that supports H3600 protocol and registers it as * an input device. */ static int h3600ts_connect(struct serio *serio, struct serio_driver *drv) { struct h3600_dev *ts; struct input_dev *input_dev; int err; ts = kzalloc(sizeof(struct h3600_dev), GFP_KERNEL); input_dev = input_allocate_device(); if (!ts || !input_dev) { err = -ENOMEM; goto fail1; } ts->serio = serio; ts->dev = input_dev; snprintf(ts->phys, sizeof(ts->phys), "%s/input0", serio->phys); input_dev->name = "H3600 TouchScreen"; input_dev->phys = ts->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_H3600; input_dev->id.product = 0x0666; /* FIXME !!! We can ask the hardware */ input_dev->id.version = 0x0100; input_dev->dev.parent = &serio->dev; input_set_drvdata(input_dev, ts); input_dev->event = h3600ts_event; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) | BIT_MASK(EV_LED) | BIT_MASK(EV_PWR); input_dev->ledbit[0] = BIT_MASK(LED_SLEEP); input_set_abs_params(input_dev, ABS_X, 60, 985, 0, 0); input_set_abs_params(input_dev, ABS_Y, 35, 1024, 0, 0); set_bit(KEY_RECORD, input_dev->keybit); set_bit(KEY_Q, input_dev->keybit); set_bit(KEY_PROG1, input_dev->keybit); set_bit(KEY_PROG2, input_dev->keybit); set_bit(KEY_PROG3, input_dev->keybit); set_bit(KEY_UP, input_dev->keybit); set_bit(KEY_RIGHT, input_dev->keybit); set_bit(KEY_LEFT, input_dev->keybit); set_bit(KEY_DOWN, input_dev->keybit); set_bit(KEY_ENTER, input_dev->keybit); set_bit(KEY_SUSPEND, input_dev->keybit); set_bit(BTN_TOUCH, input_dev->keybit); /* 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, IRQF_SHARED | IRQF_DISABLED, "h3600_action", &ts->dev)) { printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n"); err = -EBUSY; goto fail2; } if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler, IRQF_SHARED | IRQF_DISABLED, "h3600_suspend", &ts->dev)) { printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n"); err = -EBUSY; goto fail3; } serio_set_drvdata(serio, ts); err = serio_open(serio, drv); if (err) return err; //h3600_flite_control(1, 25); /* default brightness */ input_register_device(ts->dev); return 0; fail3: free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts->dev); fail2: free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts->dev); fail1: serio_set_drvdata(serio, NULL); input_free_device(input_dev); kfree(ts); return err; } /* * h3600ts_disconnect() is the opposite of h3600ts_connect() */ static void h3600ts_disconnect(struct serio *serio) { struct h3600_dev *ts = serio_get_drvdata(serio); free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev); free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, &ts->dev); input_get_device(ts->dev); input_unregister_device(ts->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(ts->dev); kfree(ts); } /* * The serio driver structure. */ static struct serio_device_id h3600ts_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_H3600, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, h3600ts_serio_ids); static struct serio_driver h3600ts_drv = { .driver = { .name = "h3600ts", }, .description = DRIVER_DESC, .id_table = h3600ts_serio_ids, .interrupt = h3600ts_interrupt, .connect = h3600ts_connect, .disconnect = h3600ts_disconnect, }; /* * The functions for inserting/removing us as a module. */ static int __init h3600ts_init(void) { return serio_register_driver(&h3600ts_drv); } static void __exit h3600ts_exit(void) { serio_unregister_driver(&h3600ts_drv); } module_init(h3600ts_init); module_exit(h3600ts_exit);