Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (c) 1999-2001 Vojtech Pavlik |
3 | */ | |
4 | ||
5 | /* | |
6 | * 82C710 C&T mouse port chip driver for Linux | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Should you need to contact me, the author, you can do so either by | |
25 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
26 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
27 | */ | |
28 | ||
29 | #include <linux/delay.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/ioport.h> | |
1da177e4 LT |
32 | #include <linux/init.h> |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/serio.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/err.h> | |
d052d1be | 37 | #include <linux/platform_device.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
41 | ||
42 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
43 | MODULE_DESCRIPTION("82C710 C&T mouse port chip driver"); | |
44 | MODULE_LICENSE("GPL"); | |
45 | ||
46 | /* | |
47 | * ct82c710 interface | |
48 | */ | |
49 | ||
50 | #define CT82C710_DEV_IDLE 0x01 /* Device Idle */ | |
51 | #define CT82C710_RX_FULL 0x02 /* Device Char received */ | |
52 | #define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */ | |
53 | #define CT82C710_RESET 0x08 /* Device Reset */ | |
54 | #define CT82C710_INTS_ON 0x10 /* Device Interrupt On */ | |
55 | #define CT82C710_ERROR_FLAG 0x20 /* Device Error */ | |
56 | #define CT82C710_CLEAR 0x40 /* Device Clear */ | |
57 | #define CT82C710_ENABLE 0x80 /* Device Enable */ | |
58 | ||
59 | #define CT82C710_IRQ 12 | |
60 | ||
61 | #define CT82C710_DATA ct82c710_iores.start | |
62 | #define CT82C710_STATUS (ct82c710_iores.start + 1) | |
63 | ||
64 | static struct serio *ct82c710_port; | |
65 | static struct platform_device *ct82c710_device; | |
66 | static struct resource ct82c710_iores; | |
67 | ||
68 | /* | |
69 | * Interrupt handler for the 82C710 mouse port. A character | |
70 | * is waiting in the 82C710. | |
71 | */ | |
72 | ||
7d12e780 | 73 | static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id) |
1da177e4 | 74 | { |
7d12e780 | 75 | return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0); |
1da177e4 LT |
76 | } |
77 | ||
78 | /* | |
79 | * Wait for device to send output char and flush any input char. | |
80 | */ | |
81 | ||
82 | static int ct82c170_wait(void) | |
83 | { | |
84 | int timeout = 60000; | |
85 | ||
86 | while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE)) | |
87 | != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) { | |
88 | ||
89 | if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA); | |
90 | ||
91 | udelay(1); | |
92 | timeout--; | |
93 | } | |
94 | ||
95 | return !timeout; | |
96 | } | |
97 | ||
98 | static void ct82c710_close(struct serio *serio) | |
99 | { | |
100 | if (ct82c170_wait()) | |
101 | printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); | |
102 | ||
103 | outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS); | |
104 | ||
105 | if (ct82c170_wait()) | |
106 | printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); | |
107 | ||
108 | free_irq(CT82C710_IRQ, NULL); | |
109 | } | |
110 | ||
111 | static int ct82c710_open(struct serio *serio) | |
112 | { | |
113 | unsigned char status; | |
114 | ||
115 | if (request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL)) | |
116 | return -1; | |
117 | ||
118 | status = inb_p(CT82C710_STATUS); | |
119 | ||
120 | status |= (CT82C710_ENABLE | CT82C710_RESET); | |
121 | outb_p(status, CT82C710_STATUS); | |
122 | ||
123 | status &= ~(CT82C710_RESET); | |
124 | outb_p(status, CT82C710_STATUS); | |
125 | ||
126 | status |= CT82C710_INTS_ON; | |
127 | outb_p(status, CT82C710_STATUS); /* Enable interrupts */ | |
128 | ||
129 | while (ct82c170_wait()) { | |
130 | printk(KERN_ERR "ct82c710: Device busy in open()\n"); | |
131 | status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON); | |
132 | outb_p(status, CT82C710_STATUS); | |
133 | free_irq(CT82C710_IRQ, NULL); | |
134 | return -1; | |
135 | } | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Write to the 82C710 mouse device. | |
142 | */ | |
143 | ||
144 | static int ct82c710_write(struct serio *port, unsigned char c) | |
145 | { | |
146 | if (ct82c170_wait()) return -1; | |
147 | outb_p(c, CT82C710_DATA); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | /* | |
152 | * See if we can find a 82C710 device. Read mouse address. | |
153 | */ | |
154 | ||
916d83cf | 155 | static int __init ct82c710_detect(void) |
1da177e4 LT |
156 | { |
157 | outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */ | |
158 | outb_p(0xaa, 0x3fa); /* Inverse of 55 */ | |
159 | outb_p(0x36, 0x3fa); /* Address the chip */ | |
160 | outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */ | |
161 | outb_p(0x1b, 0x2fa); /* Inverse of e4 */ | |
162 | outb_p(0x0f, 0x390); /* Write index */ | |
163 | if (inb_p(0x391) != 0xe4) /* Config address found? */ | |
916d83cf | 164 | return -ENODEV; /* No: no 82C710 here */ |
1da177e4 LT |
165 | |
166 | outb_p(0x0d, 0x390); /* Write index */ | |
167 | ct82c710_iores.start = inb_p(0x391) << 2; /* Get mouse I/O address */ | |
168 | ct82c710_iores.end = ct82c710_iores.start + 1; | |
169 | ct82c710_iores.flags = IORESOURCE_IO; | |
170 | outb_p(0x0f, 0x390); | |
171 | outb_p(0x0f, 0x391); /* Close config mode */ | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
916d83cf | 176 | static int __devinit ct82c710_probe(struct platform_device *dev) |
1da177e4 | 177 | { |
916d83cf DT |
178 | ct82c710_port = kzalloc(sizeof(struct serio), GFP_KERNEL); |
179 | if (!ct82c710_port) | |
180 | return -ENOMEM; | |
181 | ||
182 | ct82c710_port->id.type = SERIO_8042; | |
183 | ct82c710_port->dev.parent = &dev->dev; | |
184 | ct82c710_port->open = ct82c710_open; | |
185 | ct82c710_port->close = ct82c710_close; | |
186 | ct82c710_port->write = ct82c710_write; | |
187 | strlcpy(ct82c710_port->name, "C&T 82c710 mouse port", | |
188 | sizeof(ct82c710_port->name)); | |
189 | snprintf(ct82c710_port->phys, sizeof(ct82c710_port->phys), | |
e29419ff | 190 | "isa%16llx/serio0", (unsigned long long)CT82C710_DATA); |
916d83cf DT |
191 | |
192 | serio_register_port(ct82c710_port); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static int __devexit ct82c710_remove(struct platform_device *dev) | |
198 | { | |
199 | serio_unregister_port(ct82c710_port); | |
1da177e4 | 200 | |
916d83cf | 201 | return 0; |
1da177e4 LT |
202 | } |
203 | ||
916d83cf DT |
204 | static struct platform_driver ct82c710_driver = { |
205 | .driver = { | |
206 | .name = "ct82c710", | |
207 | .owner = THIS_MODULE, | |
208 | }, | |
209 | .probe = ct82c710_probe, | |
210 | .remove = __devexit_p(ct82c710_remove), | |
211 | }; | |
212 | ||
213 | ||
1da177e4 LT |
214 | static int __init ct82c710_init(void) |
215 | { | |
916d83cf | 216 | int error; |
1da177e4 | 217 | |
916d83cf DT |
218 | error = ct82c710_detect(); |
219 | if (error) | |
220 | return error; | |
1da177e4 | 221 | |
916d83cf DT |
222 | error = platform_driver_register(&ct82c710_driver); |
223 | if (error) | |
224 | return error; | |
225 | ||
226 | ct82c710_device = platform_device_alloc("ct82c710", -1); | |
227 | if (!ct82c710_device) { | |
228 | error = -ENOMEM; | |
229 | goto err_unregister_driver; | |
1da177e4 LT |
230 | } |
231 | ||
916d83cf DT |
232 | error = platform_device_add_resources(ct82c710_device, &ct82c710_iores, 1); |
233 | if (error) | |
234 | goto err_free_device; | |
235 | ||
236 | error = platform_device_add(ct82c710_device); | |
237 | if (error) | |
238 | goto err_free_device; | |
239 | ||
1da177e4 LT |
240 | serio_register_port(ct82c710_port); |
241 | ||
e29419ff GKH |
242 | printk(KERN_INFO "serio: C&T 82c710 mouse port at %#llx irq %d\n", |
243 | (unsigned long long)CT82C710_DATA, CT82C710_IRQ); | |
1da177e4 LT |
244 | |
245 | return 0; | |
916d83cf DT |
246 | |
247 | err_free_device: | |
248 | platform_device_put(ct82c710_device); | |
249 | err_unregister_driver: | |
250 | platform_driver_unregister(&ct82c710_driver); | |
251 | return error; | |
1da177e4 LT |
252 | } |
253 | ||
254 | static void __exit ct82c710_exit(void) | |
255 | { | |
1da177e4 | 256 | platform_device_unregister(ct82c710_device); |
916d83cf | 257 | platform_driver_unregister(&ct82c710_driver); |
1da177e4 LT |
258 | } |
259 | ||
260 | module_init(ct82c710_init); | |
261 | module_exit(ct82c710_exit); |