Adam Bennett | 422dee5 | 2010-04-12 19:54:38 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Hampshire serial touchscreen driver |
| 3 | * |
| 4 | * Copyright (c) 2010 Adam Bennett |
| 5 | * Based on the dynapro driver (c) Tias Guns |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License version 2 as published by |
| 12 | * the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | /* |
| 16 | * 2010/04/08 Adam Bennett <abennett72@gmail.com> |
| 17 | * Copied dynapro.c and edited for Hampshire 4-byte protocol |
| 18 | */ |
| 19 | |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/input.h> |
| 25 | #include <linux/serio.h> |
Adam Bennett | 422dee5 | 2010-04-12 19:54:38 -0700 | [diff] [blame] | 26 | |
| 27 | #define DRIVER_DESC "Hampshire serial touchscreen driver" |
| 28 | |
| 29 | MODULE_AUTHOR("Adam Bennett <abennett72@gmail.com>"); |
| 30 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 31 | MODULE_LICENSE("GPL"); |
| 32 | |
| 33 | /* |
| 34 | * Definitions & global arrays. |
| 35 | */ |
| 36 | |
| 37 | #define HAMPSHIRE_FORMAT_TOUCH_BIT 0x40 |
| 38 | #define HAMPSHIRE_FORMAT_LENGTH 4 |
| 39 | #define HAMPSHIRE_RESPONSE_BEGIN_BYTE 0x80 |
| 40 | |
| 41 | #define HAMPSHIRE_MIN_XC 0 |
| 42 | #define HAMPSHIRE_MAX_XC 0x1000 |
| 43 | #define HAMPSHIRE_MIN_YC 0 |
| 44 | #define HAMPSHIRE_MAX_YC 0x1000 |
| 45 | |
| 46 | #define HAMPSHIRE_GET_XC(data) (((data[3] & 0x0c) >> 2) | (data[1] << 2) | ((data[0] & 0x38) << 6)) |
| 47 | #define HAMPSHIRE_GET_YC(data) ((data[3] & 0x03) | (data[2] << 2) | ((data[0] & 0x07) << 9)) |
| 48 | #define HAMPSHIRE_GET_TOUCHED(data) (HAMPSHIRE_FORMAT_TOUCH_BIT & data[0]) |
| 49 | |
| 50 | /* |
| 51 | * Per-touchscreen data. |
| 52 | */ |
| 53 | |
| 54 | struct hampshire { |
| 55 | struct input_dev *dev; |
| 56 | struct serio *serio; |
| 57 | int idx; |
| 58 | unsigned char data[HAMPSHIRE_FORMAT_LENGTH]; |
| 59 | char phys[32]; |
| 60 | }; |
| 61 | |
| 62 | static void hampshire_process_data(struct hampshire *phampshire) |
| 63 | { |
| 64 | struct input_dev *dev = phampshire->dev; |
| 65 | |
| 66 | if (HAMPSHIRE_FORMAT_LENGTH == ++phampshire->idx) { |
| 67 | input_report_abs(dev, ABS_X, HAMPSHIRE_GET_XC(phampshire->data)); |
| 68 | input_report_abs(dev, ABS_Y, HAMPSHIRE_GET_YC(phampshire->data)); |
| 69 | input_report_key(dev, BTN_TOUCH, |
| 70 | HAMPSHIRE_GET_TOUCHED(phampshire->data)); |
| 71 | input_sync(dev); |
| 72 | |
| 73 | phampshire->idx = 0; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | static irqreturn_t hampshire_interrupt(struct serio *serio, |
| 78 | unsigned char data, unsigned int flags) |
| 79 | { |
| 80 | struct hampshire *phampshire = serio_get_drvdata(serio); |
| 81 | |
| 82 | phampshire->data[phampshire->idx] = data; |
| 83 | |
| 84 | if (HAMPSHIRE_RESPONSE_BEGIN_BYTE & phampshire->data[0]) |
| 85 | hampshire_process_data(phampshire); |
| 86 | else |
| 87 | dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n", |
| 88 | phampshire->data[0]); |
| 89 | |
| 90 | return IRQ_HANDLED; |
| 91 | } |
| 92 | |
| 93 | static void hampshire_disconnect(struct serio *serio) |
| 94 | { |
| 95 | struct hampshire *phampshire = serio_get_drvdata(serio); |
| 96 | |
| 97 | input_get_device(phampshire->dev); |
| 98 | input_unregister_device(phampshire->dev); |
| 99 | serio_close(serio); |
| 100 | serio_set_drvdata(serio, NULL); |
| 101 | input_put_device(phampshire->dev); |
| 102 | kfree(phampshire); |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * hampshire_connect() is the routine that is called when someone adds a |
| 107 | * new serio device that supports hampshire protocol and registers it as |
| 108 | * an input device. This is usually accomplished using inputattach. |
| 109 | */ |
| 110 | |
| 111 | static int hampshire_connect(struct serio *serio, struct serio_driver *drv) |
| 112 | { |
| 113 | struct hampshire *phampshire; |
| 114 | struct input_dev *input_dev; |
| 115 | int err; |
| 116 | |
| 117 | phampshire = kzalloc(sizeof(struct hampshire), GFP_KERNEL); |
| 118 | input_dev = input_allocate_device(); |
| 119 | if (!phampshire || !input_dev) { |
| 120 | err = -ENOMEM; |
| 121 | goto fail1; |
| 122 | } |
| 123 | |
| 124 | phampshire->serio = serio; |
| 125 | phampshire->dev = input_dev; |
| 126 | snprintf(phampshire->phys, sizeof(phampshire->phys), |
| 127 | "%s/input0", serio->phys); |
| 128 | |
| 129 | input_dev->name = "Hampshire Serial TouchScreen"; |
| 130 | input_dev->phys = phampshire->phys; |
| 131 | input_dev->id.bustype = BUS_RS232; |
| 132 | input_dev->id.vendor = SERIO_HAMPSHIRE; |
| 133 | input_dev->id.product = 0; |
| 134 | input_dev->id.version = 0x0001; |
| 135 | input_dev->dev.parent = &serio->dev; |
| 136 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 137 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 138 | input_set_abs_params(phampshire->dev, ABS_X, |
| 139 | HAMPSHIRE_MIN_XC, HAMPSHIRE_MAX_XC, 0, 0); |
| 140 | input_set_abs_params(phampshire->dev, ABS_Y, |
| 141 | HAMPSHIRE_MIN_YC, HAMPSHIRE_MAX_YC, 0, 0); |
| 142 | |
| 143 | serio_set_drvdata(serio, phampshire); |
| 144 | |
| 145 | err = serio_open(serio, drv); |
| 146 | if (err) |
| 147 | goto fail2; |
| 148 | |
| 149 | err = input_register_device(phampshire->dev); |
| 150 | if (err) |
| 151 | goto fail3; |
| 152 | |
| 153 | return 0; |
| 154 | |
| 155 | fail3: serio_close(serio); |
| 156 | fail2: serio_set_drvdata(serio, NULL); |
| 157 | fail1: input_free_device(input_dev); |
| 158 | kfree(phampshire); |
| 159 | return err; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * The serio driver structure. |
| 164 | */ |
| 165 | |
Arvind Yadav | 9c4f4ba | 2017-08-18 17:11:20 -0700 | [diff] [blame] | 166 | static const struct serio_device_id hampshire_serio_ids[] = { |
Adam Bennett | 422dee5 | 2010-04-12 19:54:38 -0700 | [diff] [blame] | 167 | { |
| 168 | .type = SERIO_RS232, |
| 169 | .proto = SERIO_HAMPSHIRE, |
| 170 | .id = SERIO_ANY, |
| 171 | .extra = SERIO_ANY, |
| 172 | }, |
| 173 | { 0 } |
| 174 | }; |
| 175 | |
| 176 | MODULE_DEVICE_TABLE(serio, hampshire_serio_ids); |
| 177 | |
| 178 | static struct serio_driver hampshire_drv = { |
| 179 | .driver = { |
| 180 | .name = "hampshire", |
| 181 | }, |
| 182 | .description = DRIVER_DESC, |
| 183 | .id_table = hampshire_serio_ids, |
| 184 | .interrupt = hampshire_interrupt, |
| 185 | .connect = hampshire_connect, |
| 186 | .disconnect = hampshire_disconnect, |
| 187 | }; |
| 188 | |
Axel Lin | 65ac9f7 | 2012-04-03 23:50:17 -0700 | [diff] [blame] | 189 | module_serio_driver(hampshire_drv); |