Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / drivers / input / touchscreen / htcpen.c
1 /*
2  * HTC Shift touchscreen driver
3  *
4  * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License version 2 as published
8  * by the Free Software Foundation.
9  */
10
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/input.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/init.h>
18 #include <linux/irq.h>
19 #include <linux/isa.h>
20 #include <linux/ioport.h>
21 #include <linux/dmi.h>
22
23 MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
24 MODULE_DESCRIPTION("HTC Shift touchscreen driver");
25 MODULE_LICENSE("GPL");
26
27 #define HTCPEN_PORT_IRQ_CLEAR   0x068
28 #define HTCPEN_PORT_INIT        0x06c
29 #define HTCPEN_PORT_INDEX       0x0250
30 #define HTCPEN_PORT_DATA        0x0251
31 #define HTCPEN_IRQ              3
32
33 #define DEVICE_ENABLE           0xa2
34 #define DEVICE_DISABLE          0xa3
35
36 #define X_INDEX                 3
37 #define Y_INDEX                 5
38 #define TOUCH_INDEX             0xb
39 #define LSB_XY_INDEX            0xc
40 #define X_AXIS_MAX              2040
41 #define Y_AXIS_MAX              2040
42
43 static int invert_x;
44 module_param(invert_x, bool, 0644);
45 MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
46 static int invert_y;
47 module_param(invert_y, bool, 0644);
48 MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
49
50 static struct pnp_device_id pnp_ids[] = {
51         { .id = "PNP0cc0" },
52         { .id = "" }
53 };
54 MODULE_DEVICE_TABLE(pnp, pnp_ids);
55
56 static irqreturn_t htcpen_interrupt(int irq, void *handle)
57 {
58         struct input_dev *htcpen_dev = handle;
59         unsigned short x, y, xy;
60
61         /* 0 = press; 1 = release */
62         outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX);
63
64         if (inb_p(HTCPEN_PORT_DATA)) {
65                 input_report_key(htcpen_dev, BTN_TOUCH, 0);
66         } else {
67                 outb_p(X_INDEX, HTCPEN_PORT_INDEX);
68                 x = inb_p(HTCPEN_PORT_DATA);
69
70                 outb_p(Y_INDEX, HTCPEN_PORT_INDEX);
71                 y = inb_p(HTCPEN_PORT_DATA);
72
73                 outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX);
74                 xy = inb_p(HTCPEN_PORT_DATA);
75
76                 /* get high resolution value of X and Y using LSB */
77                 x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf));
78                 y = (y * 8) + (xy & 0xf);
79                 if (invert_x)
80                         x = X_AXIS_MAX - x;
81                 if (invert_y)
82                         y = Y_AXIS_MAX - y;
83
84                 if (x != X_AXIS_MAX && x != 0) {
85                         input_report_key(htcpen_dev, BTN_TOUCH, 1);
86                         input_report_abs(htcpen_dev, ABS_X, x);
87                         input_report_abs(htcpen_dev, ABS_Y, y);
88                 }
89         }
90
91         input_sync(htcpen_dev);
92
93         inb_p(HTCPEN_PORT_IRQ_CLEAR);
94
95         return IRQ_HANDLED;
96 }
97
98 static int htcpen_open(struct input_dev *dev)
99 {
100         outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
101
102         return 0;
103 }
104
105 static void htcpen_close(struct input_dev *dev)
106 {
107         outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
108         synchronize_irq(HTCPEN_IRQ);
109 }
110
111 static int __devinit htcpen_isa_probe(struct device *dev, unsigned int id)
112 {
113         struct input_dev *htcpen_dev;
114         int err = -EBUSY;
115
116         if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) {
117                 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
118                         HTCPEN_PORT_IRQ_CLEAR);
119                 goto request_region1_failed;
120         }
121
122         if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) {
123                 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
124                         HTCPEN_PORT_INIT);
125                 goto request_region2_failed;
126         }
127
128         if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) {
129                 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
130                         HTCPEN_PORT_INDEX);
131                 goto request_region3_failed;
132         }
133
134         htcpen_dev = input_allocate_device();
135         if (!htcpen_dev) {
136                 printk(KERN_ERR "htcpen: can't allocate device\n");
137                 err = -ENOMEM;
138                 goto input_alloc_failed;
139         }
140
141         htcpen_dev->name = "HTC Shift EC TouchScreen";
142         htcpen_dev->id.bustype = BUS_ISA;
143
144         htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
145         htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
146         input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0);
147         input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0);
148
149         htcpen_dev->open = htcpen_open;
150         htcpen_dev->close = htcpen_close;
151
152         err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen",
153                         htcpen_dev);
154         if (err) {
155                 printk(KERN_ERR "htcpen: irq busy\n");
156                 goto request_irq_failed;
157         }
158
159         inb_p(HTCPEN_PORT_IRQ_CLEAR);
160
161         err = input_register_device(htcpen_dev);
162         if (err)
163                 goto input_register_failed;
164
165         dev_set_drvdata(dev, htcpen_dev);
166
167         return 0;
168
169  input_register_failed:
170         free_irq(HTCPEN_IRQ, htcpen_dev);
171  request_irq_failed:
172         input_free_device(htcpen_dev);
173  input_alloc_failed:
174         release_region(HTCPEN_PORT_INDEX, 2);
175  request_region3_failed:
176         release_region(HTCPEN_PORT_INIT, 1);
177  request_region2_failed:
178         release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
179  request_region1_failed:
180         return err;
181 }
182
183 static int __devexit htcpen_isa_remove(struct device *dev, unsigned int id)
184 {
185         struct input_dev *htcpen_dev = dev_get_drvdata(dev);
186
187         input_unregister_device(htcpen_dev);
188
189         free_irq(HTCPEN_IRQ, htcpen_dev);
190
191         release_region(HTCPEN_PORT_INDEX, 2);
192         release_region(HTCPEN_PORT_INIT, 1);
193         release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
194
195         dev_set_drvdata(dev, NULL);
196
197         return 0;
198 }
199
200 #ifdef CONFIG_PM
201 static int htcpen_isa_suspend(struct device *dev, unsigned int n,
202                                 pm_message_t state)
203 {
204         outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
205
206         return 0;
207 }
208
209 static int htcpen_isa_resume(struct device *dev, unsigned int n)
210 {
211         outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
212
213         return 0;
214 }
215 #endif
216
217 static struct isa_driver htcpen_isa_driver = {
218         .probe          = htcpen_isa_probe,
219         .remove         = __devexit_p(htcpen_isa_remove),
220 #ifdef CONFIG_PM
221         .suspend        = htcpen_isa_suspend,
222         .resume         = htcpen_isa_resume,
223 #endif
224         .driver = {
225                 .owner  = THIS_MODULE,
226                 .name   = "htcpen",
227         }
228 };
229
230 static struct dmi_system_id __initdata htcshift_dmi_table[] = {
231         {
232                 .ident = "Shift",
233                 .matches = {
234                         DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"),
235                         DMI_MATCH(DMI_PRODUCT_NAME, "Shift"),
236                 },
237         },
238         { }
239 };
240
241 static int __init htcpen_isa_init(void)
242 {
243         if (!dmi_check_system(htcshift_dmi_table))
244                 return -ENODEV;
245
246         return isa_register_driver(&htcpen_isa_driver, 1);
247 }
248
249 static void __exit htcpen_isa_exit(void)
250 {
251         isa_unregister_driver(&htcpen_isa_driver);
252 }
253
254 module_init(htcpen_isa_init);
255 module_exit(htcpen_isa_exit);