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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (c) 2000-2001 Vojtech Pavlik |
3 | * | |
4 | * Based on the work of: | |
5 | * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de> | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Q40 PS/2 keyboard controller driver for Linux/m68k | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
26 | * | |
27 | * Should you need to contact me, the author, you can do so either by | |
28 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
29 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
30 | */ | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/serio.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/err.h> | |
37 | #include <linux/bitops.h> | |
d052d1be | 38 | #include <linux/platform_device.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | |
41 | #include <asm/io.h> | |
42 | #include <asm/uaccess.h> | |
43 | #include <asm/q40_master.h> | |
44 | #include <asm/irq.h> | |
45 | #include <asm/q40ints.h> | |
46 | ||
409e1544 DT |
47 | #define DRV_NAME "q40kbd" |
48 | ||
1da177e4 LT |
49 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
50 | MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); | |
51 | MODULE_LICENSE("GPL"); | |
409e1544 | 52 | MODULE_ALIAS("platform:" DRV_NAME); |
1da177e4 | 53 | |
409e1544 DT |
54 | struct q40kbd { |
55 | struct serio *port; | |
56 | spinlock_t lock; | |
57 | }; | |
1da177e4 | 58 | |
7d12e780 | 59 | static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) |
1da177e4 | 60 | { |
409e1544 | 61 | struct q40kbd *q40kbd = dev_id; |
1da177e4 LT |
62 | unsigned long flags; |
63 | ||
409e1544 | 64 | spin_lock_irqsave(&q40kbd->lock, flags); |
1da177e4 LT |
65 | |
66 | if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) | |
409e1544 | 67 | serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0); |
1da177e4 LT |
68 | |
69 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
70 | ||
409e1544 | 71 | spin_unlock_irqrestore(&q40kbd->lock, flags); |
1da177e4 LT |
72 | |
73 | return IRQ_HANDLED; | |
74 | } | |
75 | ||
76 | /* | |
77 | * q40kbd_flush() flushes all data that may be in the keyboard buffers | |
78 | */ | |
79 | ||
409e1544 | 80 | static void q40kbd_flush(struct q40kbd *q40kbd) |
1da177e4 | 81 | { |
26421c7a | 82 | int maxread = 100; |
1da177e4 LT |
83 | unsigned long flags; |
84 | ||
409e1544 | 85 | spin_lock_irqsave(&q40kbd->lock, flags); |
1da177e4 | 86 | |
26421c7a DT |
87 | while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) |
88 | master_inb(KEYCODE_REG); | |
1da177e4 | 89 | |
409e1544 DT |
90 | spin_unlock_irqrestore(&q40kbd->lock, flags); |
91 | } | |
92 | ||
93 | static void q40kbd_stop(void) | |
94 | { | |
95 | master_outb(0, KEY_IRQ_ENABLE_REG); | |
96 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
1da177e4 LT |
97 | } |
98 | ||
99 | /* | |
100 | * q40kbd_open() is called when a port is open by the higher layer. | |
101 | * It allocates the interrupt and enables in in the chip. | |
102 | */ | |
103 | ||
104 | static int q40kbd_open(struct serio *port) | |
105 | { | |
409e1544 | 106 | struct q40kbd *q40kbd = port->port_data; |
1da177e4 | 107 | |
409e1544 | 108 | q40kbd_flush(q40kbd); |
1da177e4 | 109 | |
26421c7a DT |
110 | /* off we go */ |
111 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
112 | master_outb(1, KEY_IRQ_ENABLE_REG); | |
1da177e4 | 113 | |
26421c7a | 114 | return 0; |
1da177e4 LT |
115 | } |
116 | ||
117 | static void q40kbd_close(struct serio *port) | |
118 | { | |
409e1544 | 119 | struct q40kbd *q40kbd = port->port_data; |
1da177e4 | 120 | |
409e1544 DT |
121 | q40kbd_stop(); |
122 | q40kbd_flush(q40kbd); | |
1da177e4 LT |
123 | } |
124 | ||
5298cc4c | 125 | static int q40kbd_probe(struct platform_device *pdev) |
1da177e4 | 126 | { |
409e1544 DT |
127 | struct q40kbd *q40kbd; |
128 | struct serio *port; | |
129 | int error; | |
130 | ||
131 | q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL); | |
132 | port = kzalloc(sizeof(struct serio), GFP_KERNEL); | |
133 | if (!q40kbd || !port) { | |
134 | error = -ENOMEM; | |
135 | goto err_free_mem; | |
136 | } | |
137 | ||
138 | q40kbd->port = port; | |
139 | spin_lock_init(&q40kbd->lock); | |
140 | ||
141 | port->id.type = SERIO_8042; | |
142 | port->open = q40kbd_open; | |
143 | port->close = q40kbd_close; | |
144 | port->port_data = q40kbd; | |
145 | port->dev.parent = &pdev->dev; | |
146 | strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name)); | |
147 | strlcpy(port->phys, "Q40", sizeof(port->phys)); | |
148 | ||
149 | q40kbd_stop(); | |
150 | ||
151 | error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, | |
152 | DRV_NAME, q40kbd); | |
153 | if (error) { | |
154 | dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD); | |
155 | goto err_free_mem; | |
156 | } | |
157 | ||
158 | serio_register_port(q40kbd->port); | |
159 | ||
160 | platform_set_drvdata(pdev, q40kbd); | |
26421c7a | 161 | printk(KERN_INFO "serio: Q40 kbd registered\n"); |
1da177e4 | 162 | |
26421c7a | 163 | return 0; |
409e1544 DT |
164 | |
165 | err_free_mem: | |
166 | kfree(port); | |
167 | kfree(q40kbd); | |
168 | return error; | |
1da177e4 LT |
169 | } |
170 | ||
409e1544 | 171 | static int __devexit q40kbd_remove(struct platform_device *pdev) |
26421c7a | 172 | { |
409e1544 DT |
173 | struct q40kbd *q40kbd = platform_get_drvdata(pdev); |
174 | ||
175 | /* | |
176 | * q40kbd_close() will be called as part of unregistering | |
177 | * and will ensure that IRQ is turned off, so it is safe | |
178 | * to unregister port first and free IRQ later. | |
179 | */ | |
180 | serio_unregister_port(q40kbd->port); | |
181 | free_irq(Q40_IRQ_KEYBOARD, q40kbd); | |
182 | kfree(q40kbd); | |
183 | ||
184 | platform_set_drvdata(pdev, NULL); | |
26421c7a DT |
185 | return 0; |
186 | } | |
187 | ||
188 | static struct platform_driver q40kbd_driver = { | |
189 | .driver = { | |
190 | .name = "q40kbd", | |
191 | .owner = THIS_MODULE, | |
192 | }, | |
1cb0aa88 | 193 | .remove = q40kbd_remove, |
26421c7a DT |
194 | }; |
195 | ||
1da177e4 LT |
196 | static int __init q40kbd_init(void) |
197 | { | |
409e1544 | 198 | return platform_driver_probe(&q40kbd_driver, q40kbd_probe); |
1da177e4 LT |
199 | } |
200 | ||
201 | static void __exit q40kbd_exit(void) | |
202 | { | |
26421c7a | 203 | platform_driver_unregister(&q40kbd_driver); |
1da177e4 LT |
204 | } |
205 | ||
206 | module_init(q40kbd_init); | |
207 | module_exit(q40kbd_exit); |