Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * MicroTouch (3M) serial touchscreen driver |
| 3 | * |
| 4 | * Copyright (c) 2004 Vojtech Pavlik |
| 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License version 2 as published by |
| 10 | * the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | /* |
| 14 | * 2005/02/19 Dan Streetman <ddstreet@ieee.org> |
| 15 | * Copied elo.c and edited for MicroTouch protocol |
| 16 | */ |
| 17 | |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/input.h> |
| 23 | #include <linux/serio.h> |
| 24 | #include <linux/init.h> |
| 25 | |
| 26 | #define DRIVER_DESC "MicroTouch serial touchscreen driver" |
| 27 | |
| 28 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| 29 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | |
| 32 | /* |
| 33 | * Definitions & global arrays. |
| 34 | */ |
| 35 | |
| 36 | #define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80 |
| 37 | #define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40 |
| 38 | #define MTOUCH_FORMAT_TABLET_LENGTH 5 |
| 39 | #define MTOUCH_RESPONSE_BEGIN_BYTE 0x01 |
| 40 | #define MTOUCH_RESPONSE_END_BYTE 0x0d |
| 41 | |
| 42 | /* todo: check specs for max length of all responses */ |
| 43 | #define MTOUCH_MAX_LENGTH 16 |
| 44 | |
| 45 | #define MTOUCH_MIN_XC 0 |
| 46 | #define MTOUCH_MAX_XC 0x3fff |
| 47 | #define MTOUCH_MIN_YC 0 |
| 48 | #define MTOUCH_MAX_YC 0x3fff |
| 49 | |
| 50 | #define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1]) |
| 51 | #define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3]) |
| 52 | #define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0]) |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | /* |
| 55 | * Per-touchscreen data. |
| 56 | */ |
| 57 | |
| 58 | struct mtouch { |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 59 | struct input_dev *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | struct serio *serio; |
| 61 | int idx; |
| 62 | unsigned char data[MTOUCH_MAX_LENGTH]; |
| 63 | char phys[32]; |
| 64 | }; |
| 65 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 66 | static void mtouch_process_format_tablet(struct mtouch *mtouch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 68 | struct input_dev *dev = mtouch->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data)); |
| 72 | input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data)); |
| 73 | input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data)); |
| 74 | input_sync(dev); |
| 75 | |
| 76 | mtouch->idx = 0; |
| 77 | } |
| 78 | } |
| 79 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 80 | static void mtouch_process_response(struct mtouch *mtouch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
| 82 | if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) { |
| 83 | /* FIXME - process response */ |
| 84 | mtouch->idx = 0; |
| 85 | } else if (MTOUCH_MAX_LENGTH == mtouch->idx) { |
| 86 | printk(KERN_ERR "mtouch.c: too many response bytes\n"); |
| 87 | mtouch->idx = 0; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | static irqreturn_t mtouch_interrupt(struct serio *serio, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 92 | unsigned char data, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
| 94 | struct mtouch* mtouch = serio_get_drvdata(serio); |
| 95 | |
| 96 | mtouch->data[mtouch->idx] = data; |
| 97 | |
| 98 | if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0]) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 99 | mtouch_process_format_tablet(mtouch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0]) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 101 | mtouch_process_response(mtouch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | else |
| 103 | printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]); |
| 104 | |
| 105 | return IRQ_HANDLED; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * mtouch_disconnect() is the opposite of mtouch_connect() |
| 110 | */ |
| 111 | |
| 112 | static void mtouch_disconnect(struct serio *serio) |
| 113 | { |
| 114 | struct mtouch* mtouch = serio_get_drvdata(serio); |
| 115 | |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 116 | input_get_device(mtouch->dev); |
| 117 | input_unregister_device(mtouch->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | serio_close(serio); |
| 119 | serio_set_drvdata(serio, NULL); |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 120 | input_put_device(mtouch->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | kfree(mtouch); |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * mtouch_connect() is the routine that is called when someone adds a |
| 126 | * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as |
| 127 | * an input device. |
| 128 | */ |
| 129 | |
| 130 | static int mtouch_connect(struct serio *serio, struct serio_driver *drv) |
| 131 | { |
| 132 | struct mtouch *mtouch; |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 133 | struct input_dev *input_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | int err; |
| 135 | |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 136 | mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL); |
| 137 | input_dev = input_allocate_device(); |
| 138 | if (!mtouch || !input_dev) { |
| 139 | err = -ENOMEM; |
Dmitry Torokhov | 52c1f57 | 2006-11-05 22:40:03 -0500 | [diff] [blame^] | 140 | goto fail1; |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 141 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | mtouch->serio = serio; |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 144 | mtouch->dev = input_dev; |
Dmitry Torokhov | a21466c | 2006-06-26 01:46:04 -0400 | [diff] [blame] | 145 | snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 147 | input_dev->private = mtouch; |
| 148 | input_dev->name = "MicroTouch Serial TouchScreen"; |
| 149 | input_dev->phys = mtouch->phys; |
| 150 | input_dev->id.bustype = BUS_RS232; |
| 151 | input_dev->id.vendor = SERIO_MICROTOUCH; |
| 152 | input_dev->id.product = 0; |
| 153 | input_dev->id.version = 0x0100; |
| 154 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
| 155 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); |
| 156 | input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0); |
| 157 | input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | serio_set_drvdata(serio, mtouch); |
| 160 | |
| 161 | err = serio_open(serio, drv); |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 162 | if (err) |
Dmitry Torokhov | 52c1f57 | 2006-11-05 22:40:03 -0500 | [diff] [blame^] | 163 | goto fail2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Dmitry Torokhov | 52c1f57 | 2006-11-05 22:40:03 -0500 | [diff] [blame^] | 165 | err = input_register_device(mtouch->dev); |
| 166 | if (err) |
| 167 | goto fail3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | return 0; |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 170 | |
Dmitry Torokhov | 52c1f57 | 2006-11-05 22:40:03 -0500 | [diff] [blame^] | 171 | fail3: serio_close(serio); |
| 172 | fail2: serio_set_drvdata(serio, NULL); |
| 173 | fail1: input_free_device(input_dev); |
Dmitry Torokhov | eca1ed1 | 2005-09-15 02:01:46 -0500 | [diff] [blame] | 174 | kfree(mtouch); |
| 175 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | /* |
| 179 | * The serio driver structure. |
| 180 | */ |
| 181 | |
| 182 | static struct serio_device_id mtouch_serio_ids[] = { |
| 183 | { |
| 184 | .type = SERIO_RS232, |
| 185 | .proto = SERIO_MICROTOUCH, |
| 186 | .id = SERIO_ANY, |
| 187 | .extra = SERIO_ANY, |
| 188 | }, |
| 189 | { 0 } |
| 190 | }; |
| 191 | |
| 192 | MODULE_DEVICE_TABLE(serio, mtouch_serio_ids); |
| 193 | |
| 194 | static struct serio_driver mtouch_drv = { |
| 195 | .driver = { |
| 196 | .name = "mtouch", |
| 197 | }, |
| 198 | .description = DRIVER_DESC, |
| 199 | .id_table = mtouch_serio_ids, |
| 200 | .interrupt = mtouch_interrupt, |
| 201 | .connect = mtouch_connect, |
| 202 | .disconnect = mtouch_disconnect, |
| 203 | }; |
| 204 | |
| 205 | /* |
| 206 | * The functions for inserting/removing us as a module. |
| 207 | */ |
| 208 | |
| 209 | static int __init mtouch_init(void) |
| 210 | { |
| 211 | serio_register_driver(&mtouch_drv); |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static void __exit mtouch_exit(void) |
| 216 | { |
| 217 | serio_unregister_driver(&mtouch_drv); |
| 218 | } |
| 219 | |
| 220 | module_init(mtouch_init); |
| 221 | module_exit(mtouch_exit); |