Commit | Line | Data |
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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> | |
1da177e4 LT |
33 | #include <linux/serio.h> |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/err.h> | |
36 | #include <linux/bitops.h> | |
d052d1be | 37 | #include <linux/platform_device.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
41 | #include <asm/uaccess.h> | |
42 | #include <asm/q40_master.h> | |
43 | #include <asm/irq.h> | |
44 | #include <asm/q40ints.h> | |
45 | ||
409e1544 DT |
46 | #define DRV_NAME "q40kbd" |
47 | ||
1da177e4 LT |
48 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
49 | MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); | |
50 | MODULE_LICENSE("GPL"); | |
409e1544 | 51 | MODULE_ALIAS("platform:" DRV_NAME); |
1da177e4 | 52 | |
409e1544 DT |
53 | struct q40kbd { |
54 | struct serio *port; | |
55 | spinlock_t lock; | |
56 | }; | |
1da177e4 | 57 | |
7d12e780 | 58 | static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) |
1da177e4 | 59 | { |
409e1544 | 60 | struct q40kbd *q40kbd = dev_id; |
1da177e4 LT |
61 | unsigned long flags; |
62 | ||
409e1544 | 63 | spin_lock_irqsave(&q40kbd->lock, flags); |
1da177e4 LT |
64 | |
65 | if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) | |
409e1544 | 66 | serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0); |
1da177e4 LT |
67 | |
68 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
69 | ||
409e1544 | 70 | spin_unlock_irqrestore(&q40kbd->lock, flags); |
1da177e4 LT |
71 | |
72 | return IRQ_HANDLED; | |
73 | } | |
74 | ||
75 | /* | |
76 | * q40kbd_flush() flushes all data that may be in the keyboard buffers | |
77 | */ | |
78 | ||
409e1544 | 79 | static void q40kbd_flush(struct q40kbd *q40kbd) |
1da177e4 | 80 | { |
26421c7a | 81 | int maxread = 100; |
1da177e4 LT |
82 | unsigned long flags; |
83 | ||
409e1544 | 84 | spin_lock_irqsave(&q40kbd->lock, flags); |
1da177e4 | 85 | |
26421c7a DT |
86 | while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) |
87 | master_inb(KEYCODE_REG); | |
1da177e4 | 88 | |
409e1544 DT |
89 | spin_unlock_irqrestore(&q40kbd->lock, flags); |
90 | } | |
91 | ||
92 | static void q40kbd_stop(void) | |
93 | { | |
94 | master_outb(0, KEY_IRQ_ENABLE_REG); | |
95 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
1da177e4 LT |
96 | } |
97 | ||
98 | /* | |
99 | * q40kbd_open() is called when a port is open by the higher layer. | |
100 | * It allocates the interrupt and enables in in the chip. | |
101 | */ | |
102 | ||
103 | static int q40kbd_open(struct serio *port) | |
104 | { | |
409e1544 | 105 | struct q40kbd *q40kbd = port->port_data; |
1da177e4 | 106 | |
409e1544 | 107 | q40kbd_flush(q40kbd); |
1da177e4 | 108 | |
26421c7a DT |
109 | /* off we go */ |
110 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
111 | master_outb(1, KEY_IRQ_ENABLE_REG); | |
1da177e4 | 112 | |
26421c7a | 113 | return 0; |
1da177e4 LT |
114 | } |
115 | ||
116 | static void q40kbd_close(struct serio *port) | |
117 | { | |
409e1544 | 118 | struct q40kbd *q40kbd = port->port_data; |
1da177e4 | 119 | |
409e1544 DT |
120 | q40kbd_stop(); |
121 | q40kbd_flush(q40kbd); | |
1da177e4 LT |
122 | } |
123 | ||
5298cc4c | 124 | static int q40kbd_probe(struct platform_device *pdev) |
1da177e4 | 125 | { |
409e1544 DT |
126 | struct q40kbd *q40kbd; |
127 | struct serio *port; | |
128 | int error; | |
129 | ||
130 | q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL); | |
131 | port = kzalloc(sizeof(struct serio), GFP_KERNEL); | |
132 | if (!q40kbd || !port) { | |
133 | error = -ENOMEM; | |
134 | goto err_free_mem; | |
135 | } | |
136 | ||
137 | q40kbd->port = port; | |
138 | spin_lock_init(&q40kbd->lock); | |
139 | ||
140 | port->id.type = SERIO_8042; | |
141 | port->open = q40kbd_open; | |
142 | port->close = q40kbd_close; | |
143 | port->port_data = q40kbd; | |
144 | port->dev.parent = &pdev->dev; | |
145 | strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name)); | |
146 | strlcpy(port->phys, "Q40", sizeof(port->phys)); | |
147 | ||
148 | q40kbd_stop(); | |
149 | ||
150 | error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, | |
151 | DRV_NAME, q40kbd); | |
152 | if (error) { | |
153 | dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD); | |
154 | goto err_free_mem; | |
155 | } | |
156 | ||
157 | serio_register_port(q40kbd->port); | |
158 | ||
159 | platform_set_drvdata(pdev, q40kbd); | |
26421c7a | 160 | printk(KERN_INFO "serio: Q40 kbd registered\n"); |
1da177e4 | 161 | |
26421c7a | 162 | return 0; |
409e1544 DT |
163 | |
164 | err_free_mem: | |
165 | kfree(port); | |
166 | kfree(q40kbd); | |
167 | return error; | |
1da177e4 LT |
168 | } |
169 | ||
e2619cf7 | 170 | static int q40kbd_remove(struct platform_device *pdev) |
26421c7a | 171 | { |
409e1544 DT |
172 | struct q40kbd *q40kbd = platform_get_drvdata(pdev); |
173 | ||
174 | /* | |
175 | * q40kbd_close() will be called as part of unregistering | |
176 | * and will ensure that IRQ is turned off, so it is safe | |
177 | * to unregister port first and free IRQ later. | |
178 | */ | |
179 | serio_unregister_port(q40kbd->port); | |
180 | free_irq(Q40_IRQ_KEYBOARD, q40kbd); | |
181 | kfree(q40kbd); | |
182 | ||
26421c7a DT |
183 | return 0; |
184 | } | |
185 | ||
186 | static struct platform_driver q40kbd_driver = { | |
187 | .driver = { | |
188 | .name = "q40kbd", | |
26421c7a | 189 | }, |
1cb0aa88 | 190 | .remove = q40kbd_remove, |
26421c7a DT |
191 | }; |
192 | ||
07beda4f | 193 | module_platform_driver_probe(q40kbd_driver, q40kbd_probe); |