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Commit | Line | Data |
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5f565502 HCE |
1 | /* |
2 | * Driver for simulating a mouse on GPIO lines. | |
3 | * | |
4 | * Copyright (C) 2007 Atmel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/init.h> | |
5f565502 HCE |
12 | #include <linux/module.h> |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/input-polldev.h> | |
55158c88 | 15 | #include <linux/gpio.h> |
5f565502 HCE |
16 | #include <linux/gpio_mouse.h> |
17 | ||
5f565502 HCE |
18 | |
19 | /* | |
20 | * Timer function which is run every scan_ms ms when the device is opened. | |
3a070ad1 | 21 | * The dev input variable is set to the the input_dev pointer. |
5f565502 HCE |
22 | */ |
23 | static void gpio_mouse_scan(struct input_polled_dev *dev) | |
24 | { | |
25 | struct gpio_mouse_platform_data *gpio = dev->private; | |
26 | struct input_dev *input = dev->input; | |
27 | int x, y; | |
28 | ||
29 | if (gpio->bleft >= 0) | |
30 | input_report_key(input, BTN_LEFT, | |
31 | gpio_get_value(gpio->bleft) ^ gpio->polarity); | |
32 | if (gpio->bmiddle >= 0) | |
33 | input_report_key(input, BTN_MIDDLE, | |
34 | gpio_get_value(gpio->bmiddle) ^ gpio->polarity); | |
35 | if (gpio->bright >= 0) | |
36 | input_report_key(input, BTN_RIGHT, | |
37 | gpio_get_value(gpio->bright) ^ gpio->polarity); | |
38 | ||
39 | x = (gpio_get_value(gpio->right) ^ gpio->polarity) | |
40 | - (gpio_get_value(gpio->left) ^ gpio->polarity); | |
41 | y = (gpio_get_value(gpio->down) ^ gpio->polarity) | |
42 | - (gpio_get_value(gpio->up) ^ gpio->polarity); | |
43 | ||
44 | input_report_rel(input, REL_X, x); | |
45 | input_report_rel(input, REL_Y, y); | |
46 | input_sync(input); | |
47 | } | |
48 | ||
5298cc4c | 49 | static int gpio_mouse_probe(struct platform_device *pdev) |
5f565502 HCE |
50 | { |
51 | struct gpio_mouse_platform_data *pdata = pdev->dev.platform_data; | |
52 | struct input_polled_dev *input_poll; | |
53 | struct input_dev *input; | |
54 | int pin, i; | |
55 | int error; | |
56 | ||
57 | if (!pdata) { | |
58 | dev_err(&pdev->dev, "no platform data\n"); | |
59 | error = -ENXIO; | |
60 | goto out; | |
61 | } | |
62 | ||
63 | if (pdata->scan_ms < 0) { | |
64 | dev_err(&pdev->dev, "invalid scan time\n"); | |
65 | error = -EINVAL; | |
66 | goto out; | |
67 | } | |
68 | ||
69 | for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) { | |
70 | pin = pdata->pins[i]; | |
71 | ||
72 | if (pin < 0) { | |
73 | ||
74 | if (i <= GPIO_MOUSE_PIN_RIGHT) { | |
75 | /* Mouse direction is required. */ | |
76 | dev_err(&pdev->dev, | |
77 | "missing GPIO for directions\n"); | |
78 | error = -EINVAL; | |
79 | goto out_free_gpios; | |
80 | } | |
81 | ||
82 | if (i == GPIO_MOUSE_PIN_BLEFT) | |
83 | dev_dbg(&pdev->dev, "no left button defined\n"); | |
84 | ||
85 | } else { | |
86 | error = gpio_request(pin, "gpio_mouse"); | |
87 | if (error) { | |
88 | dev_err(&pdev->dev, "fail %d pin (%d idx)\n", | |
89 | pin, i); | |
90 | goto out_free_gpios; | |
91 | } | |
92 | ||
93 | gpio_direction_input(pin); | |
94 | } | |
95 | } | |
96 | ||
97 | input_poll = input_allocate_polled_device(); | |
98 | if (!input_poll) { | |
99 | dev_err(&pdev->dev, "not enough memory for input device\n"); | |
100 | error = -ENOMEM; | |
101 | goto out_free_gpios; | |
102 | } | |
103 | ||
104 | platform_set_drvdata(pdev, input_poll); | |
105 | ||
106 | /* set input-polldev handlers */ | |
107 | input_poll->private = pdata; | |
108 | input_poll->poll = gpio_mouse_scan; | |
109 | input_poll->poll_interval = pdata->scan_ms; | |
110 | ||
111 | input = input_poll->input; | |
112 | input->name = pdev->name; | |
113 | input->id.bustype = BUS_HOST; | |
114 | input->dev.parent = &pdev->dev; | |
115 | ||
116 | input_set_capability(input, EV_REL, REL_X); | |
117 | input_set_capability(input, EV_REL, REL_Y); | |
118 | if (pdata->bleft >= 0) | |
119 | input_set_capability(input, EV_KEY, BTN_LEFT); | |
120 | if (pdata->bmiddle >= 0) | |
121 | input_set_capability(input, EV_KEY, BTN_MIDDLE); | |
122 | if (pdata->bright >= 0) | |
123 | input_set_capability(input, EV_KEY, BTN_RIGHT); | |
124 | ||
125 | error = input_register_polled_device(input_poll); | |
126 | if (error) { | |
127 | dev_err(&pdev->dev, "could not register input device\n"); | |
128 | goto out_free_polldev; | |
129 | } | |
130 | ||
131 | dev_dbg(&pdev->dev, "%d ms scan time, buttons: %s%s%s\n", | |
132 | pdata->scan_ms, | |
133 | pdata->bleft < 0 ? "" : "left ", | |
134 | pdata->bmiddle < 0 ? "" : "middle ", | |
135 | pdata->bright < 0 ? "" : "right"); | |
136 | ||
137 | return 0; | |
138 | ||
139 | out_free_polldev: | |
140 | input_free_polled_device(input_poll); | |
141 | platform_set_drvdata(pdev, NULL); | |
142 | ||
143 | out_free_gpios: | |
144 | while (--i >= 0) { | |
145 | pin = pdata->pins[i]; | |
146 | if (pin) | |
147 | gpio_free(pin); | |
148 | } | |
149 | out: | |
150 | return error; | |
151 | } | |
152 | ||
153 | static int __devexit gpio_mouse_remove(struct platform_device *pdev) | |
154 | { | |
155 | struct input_polled_dev *input = platform_get_drvdata(pdev); | |
156 | struct gpio_mouse_platform_data *pdata = input->private; | |
157 | int pin, i; | |
158 | ||
159 | input_unregister_polled_device(input); | |
160 | input_free_polled_device(input); | |
161 | ||
162 | for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) { | |
163 | pin = pdata->pins[i]; | |
164 | if (pin >= 0) | |
165 | gpio_free(pin); | |
166 | } | |
167 | ||
168 | platform_set_drvdata(pdev, NULL); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
0de048ab | 173 | static struct platform_driver gpio_mouse_device_driver = { |
eeafa5ef | 174 | .probe = gpio_mouse_probe, |
1cb0aa88 | 175 | .remove = gpio_mouse_remove, |
5f565502 HCE |
176 | .driver = { |
177 | .name = "gpio_mouse", | |
d7b5247b | 178 | .owner = THIS_MODULE, |
5f565502 HCE |
179 | } |
180 | }; | |
4fcdeac5 | 181 | module_platform_driver(gpio_mouse_device_driver); |
5f565502 | 182 | |
7c409522 | 183 | MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); |
5f565502 HCE |
184 | MODULE_DESCRIPTION("GPIO mouse driver"); |
185 | MODULE_LICENSE("GPL"); | |
eeafa5ef SB |
186 | MODULE_ALIAS("platform:gpio_mouse"); /* work with hotplug and coldplug */ |
187 |