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1 | /* |
2 | * linux/drivers/input/serio/pcips2.c |
3 | * |
4 | * Copyright (C) 2003 Russell King, All Rights Reserved. |
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 as published by |
8 | * the Free Software Foundation; either version 2 of the License. |
9 | * |
10 | * I'm not sure if this is a generic PS/2 PCI interface or specific to |
11 | * the Mobility Electronics docking station. |
12 | */ |
13 | #include <linux/module.h> |
14 | #include <linux/interrupt.h> |
15 | #include <linux/ioport.h> |
16 | #include <linux/input.h> |
17 | #include <linux/pci.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/init.h> |
20 | #include <linux/serio.h> |
21 | #include <linux/delay.h> |
22 | #include <asm/io.h> |
23 | |
24 | #define PS2_CTRL (0) |
25 | #define PS2_STATUS (1) |
26 | #define PS2_DATA (2) |
27 | |
28 | #define PS2_CTRL_CLK (1<<0) |
29 | #define PS2_CTRL_DAT (1<<1) |
30 | #define PS2_CTRL_TXIRQ (1<<2) |
31 | #define PS2_CTRL_ENABLE (1<<3) |
32 | #define PS2_CTRL_RXIRQ (1<<4) |
33 | |
34 | #define PS2_STAT_CLK (1<<0) |
35 | #define PS2_STAT_DAT (1<<1) |
36 | #define PS2_STAT_PARITY (1<<2) |
37 | #define PS2_STAT_RXFULL (1<<5) |
38 | #define PS2_STAT_TXBUSY (1<<6) |
39 | #define PS2_STAT_TXEMPTY (1<<7) |
40 | |
41 | struct pcips2_data { |
42 | struct serio *io; |
43 | unsigned int base; |
44 | struct pci_dev *dev; |
45 | }; |
46 | |
47 | static int pcips2_write(struct serio *io, unsigned char val) |
48 | { |
49 | struct pcips2_data *ps2if = io->port_data; |
50 | unsigned int stat; |
51 | |
52 | do { |
53 | stat = inb(ps2if->base + PS2_STATUS); |
54 | cpu_relax(); |
55 | } while (!(stat & PS2_STAT_TXEMPTY)); |
56 | |
57 | outb(val, ps2if->base + PS2_DATA); |
58 | |
59 | return 0; |
60 | } |
61 | |
62 | static irqreturn_t pcips2_interrupt(int irq, void *devid) |
63 | { |
64 | struct pcips2_data *ps2if = devid; |
65 | unsigned char status, scancode; |
66 | int handled = 0; |
67 | |
68 | do { |
69 | unsigned int flag; |
70 | |
71 | status = inb(ps2if->base + PS2_STATUS); |
72 | if (!(status & PS2_STAT_RXFULL)) |
73 | break; |
74 | handled = 1; |
75 | scancode = inb(ps2if->base + PS2_DATA); |
76 | if (status == 0xff && scancode == 0xff) |
77 | break; |
78 | |
79 | flag = (status & PS2_STAT_PARITY) ? 0 : SERIO_PARITY; |
80 | |
81 | if (hweight8(scancode) & 1) |
82 | flag ^= SERIO_PARITY; |
83 | |
84 | serio_interrupt(ps2if->io, scancode, flag); |
85 | } while (1); |
86 | return IRQ_RETVAL(handled); |
87 | } |
88 | |
89 | static void pcips2_flush_input(struct pcips2_data *ps2if) |
90 | { |
91 | unsigned char status, scancode; |
92 | |
93 | do { |
94 | status = inb(ps2if->base + PS2_STATUS); |
95 | if (!(status & PS2_STAT_RXFULL)) |
96 | break; |
97 | scancode = inb(ps2if->base + PS2_DATA); |
98 | if (status == 0xff && scancode == 0xff) |
99 | break; |
100 | } while (1); |
101 | } |
102 | |
103 | static int pcips2_open(struct serio *io) |
104 | { |
105 | struct pcips2_data *ps2if = io->port_data; |
106 | int ret, val = 0; |
107 | |
108 | outb(PS2_CTRL_ENABLE, ps2if->base); |
109 | pcips2_flush_input(ps2if); |
110 | |
111 | ret = request_irq(ps2if->dev->irq, pcips2_interrupt, IRQF_SHARED, |
112 | "pcips2", ps2if); |
113 | if (ret == 0) |
114 | val = PS2_CTRL_ENABLE | PS2_CTRL_RXIRQ; |
115 | |
116 | outb(val, ps2if->base); |
117 | |
118 | return ret; |
119 | } |
120 | |
121 | static void pcips2_close(struct serio *io) |
122 | { |
123 | struct pcips2_data *ps2if = io->port_data; |
124 | |
125 | outb(0, ps2if->base); |
126 | |
127 | free_irq(ps2if->dev->irq, ps2if); |
128 | } |
129 | |
130 | static int pcips2_probe(struct pci_dev *dev, const struct pci_device_id *id) |
131 | { |
132 | struct pcips2_data *ps2if; |
133 | struct serio *serio; |
134 | int ret; |
135 | |
136 | ret = pci_enable_device(dev); |
137 | if (ret) |
138 | goto out; |
139 | |
140 | ret = pci_request_regions(dev, "pcips2"); |
141 | if (ret) |
142 | goto disable; |
143 | |
144 | ps2if = kzalloc(sizeof(struct pcips2_data), GFP_KERNEL); |
145 | serio = kzalloc(sizeof(struct serio), GFP_KERNEL); |
146 | if (!ps2if || !serio) { |
147 | ret = -ENOMEM; |
148 | goto release; |
149 | } |
150 | |
151 | |
152 | serio->id.type = SERIO_8042; |
153 | serio->write = pcips2_write; |
154 | serio->open = pcips2_open; |
155 | serio->close = pcips2_close; |
156 | strlcpy(serio->name, pci_name(dev), sizeof(serio->name)); |
157 | strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys)); |
158 | serio->port_data = ps2if; |
159 | serio->dev.parent = &dev->dev; |
160 | ps2if->io = serio; |
161 | ps2if->dev = dev; |
162 | ps2if->base = pci_resource_start(dev, 0); |
163 | |
164 | pci_set_drvdata(dev, ps2if); |
165 | |
166 | serio_register_port(ps2if->io); |
167 | return 0; |
168 | |
169 | release: |
170 | kfree(ps2if); |
171 | kfree(serio); |
172 | pci_release_regions(dev); |
173 | disable: |
174 | pci_disable_device(dev); |
175 | out: |
176 | return ret; |
177 | } |
178 | |
179 | static void pcips2_remove(struct pci_dev *dev) |
180 | { |
181 | struct pcips2_data *ps2if = pci_get_drvdata(dev); |
182 | |
183 | serio_unregister_port(ps2if->io); |
184 | pci_set_drvdata(dev, NULL); |
185 | kfree(ps2if); |
186 | pci_release_regions(dev); |
187 | pci_disable_device(dev); |
188 | } |
189 | |
190 | static const struct pci_device_id pcips2_ids[] = { |
191 | { |
192 | .vendor = 0x14f2, /* MOBILITY */ |
193 | .device = 0x0123, /* Keyboard */ |
194 | .subvendor = PCI_ANY_ID, |
195 | .subdevice = PCI_ANY_ID, |
196 | .class = PCI_CLASS_INPUT_KEYBOARD << 8, |
197 | .class_mask = 0xffff00, |
198 | }, |
199 | { |
200 | .vendor = 0x14f2, /* MOBILITY */ |
201 | .device = 0x0124, /* Mouse */ |
202 | .subvendor = PCI_ANY_ID, |
203 | .subdevice = PCI_ANY_ID, |
204 | .class = PCI_CLASS_INPUT_MOUSE << 8, |
205 | .class_mask = 0xffff00, |
206 | }, |
207 | { 0, } |
208 | }; |
209 | MODULE_DEVICE_TABLE(pci, pcips2_ids); |
210 | |
211 | static struct pci_driver pcips2_driver = { |
212 | .name = "pcips2", |
213 | .id_table = pcips2_ids, |
214 | .probe = pcips2_probe, |
215 | .remove = pcips2_remove, |
216 | }; |
217 | |
218 | module_pci_driver(pcips2_driver); |
219 | |
220 | MODULE_LICENSE("GPL"); |
221 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); |
222 | MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver"); |
223 |
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