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84a14ae8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/drivers/input/serio/pcips2.c | |
4 | * | |
5 | * Copyright (C) 2003 Russell King, All Rights Reserved. | |
6 | * | |
1da177e4 LT |
7 | * I'm not sure if this is a generic PS/2 PCI interface or specific to |
8 | * the Mobility Electronics docking station. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/ioport.h> | |
13 | #include <linux/input.h> | |
14 | #include <linux/pci.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
16 | #include <linux/serio.h> |
17 | #include <linux/delay.h> | |
18 | #include <asm/io.h> | |
19 | ||
20 | #define PS2_CTRL (0) | |
21 | #define PS2_STATUS (1) | |
22 | #define PS2_DATA (2) | |
23 | ||
24 | #define PS2_CTRL_CLK (1<<0) | |
25 | #define PS2_CTRL_DAT (1<<1) | |
26 | #define PS2_CTRL_TXIRQ (1<<2) | |
27 | #define PS2_CTRL_ENABLE (1<<3) | |
28 | #define PS2_CTRL_RXIRQ (1<<4) | |
29 | ||
30 | #define PS2_STAT_CLK (1<<0) | |
31 | #define PS2_STAT_DAT (1<<1) | |
32 | #define PS2_STAT_PARITY (1<<2) | |
33 | #define PS2_STAT_RXFULL (1<<5) | |
34 | #define PS2_STAT_TXBUSY (1<<6) | |
35 | #define PS2_STAT_TXEMPTY (1<<7) | |
36 | ||
37 | struct pcips2_data { | |
38 | struct serio *io; | |
39 | unsigned int base; | |
40 | struct pci_dev *dev; | |
41 | }; | |
42 | ||
43 | static int pcips2_write(struct serio *io, unsigned char val) | |
44 | { | |
45 | struct pcips2_data *ps2if = io->port_data; | |
46 | unsigned int stat; | |
47 | ||
48 | do { | |
49 | stat = inb(ps2if->base + PS2_STATUS); | |
50 | cpu_relax(); | |
51 | } while (!(stat & PS2_STAT_TXEMPTY)); | |
52 | ||
53 | outb(val, ps2if->base + PS2_DATA); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
7d12e780 | 58 | static irqreturn_t pcips2_interrupt(int irq, void *devid) |
1da177e4 LT |
59 | { |
60 | struct pcips2_data *ps2if = devid; | |
61 | unsigned char status, scancode; | |
62 | int handled = 0; | |
63 | ||
64 | do { | |
65 | unsigned int flag; | |
66 | ||
67 | status = inb(ps2if->base + PS2_STATUS); | |
68 | if (!(status & PS2_STAT_RXFULL)) | |
69 | break; | |
70 | handled = 1; | |
71 | scancode = inb(ps2if->base + PS2_DATA); | |
72 | if (status == 0xff && scancode == 0xff) | |
73 | break; | |
74 | ||
75 | flag = (status & PS2_STAT_PARITY) ? 0 : SERIO_PARITY; | |
76 | ||
77 | if (hweight8(scancode) & 1) | |
78 | flag ^= SERIO_PARITY; | |
79 | ||
7d12e780 | 80 | serio_interrupt(ps2if->io, scancode, flag); |
1da177e4 LT |
81 | } while (1); |
82 | return IRQ_RETVAL(handled); | |
83 | } | |
84 | ||
85 | static void pcips2_flush_input(struct pcips2_data *ps2if) | |
86 | { | |
87 | unsigned char status, scancode; | |
88 | ||
89 | do { | |
90 | status = inb(ps2if->base + PS2_STATUS); | |
91 | if (!(status & PS2_STAT_RXFULL)) | |
92 | break; | |
93 | scancode = inb(ps2if->base + PS2_DATA); | |
94 | if (status == 0xff && scancode == 0xff) | |
95 | break; | |
96 | } while (1); | |
97 | } | |
98 | ||
99 | static int pcips2_open(struct serio *io) | |
100 | { | |
101 | struct pcips2_data *ps2if = io->port_data; | |
102 | int ret, val = 0; | |
103 | ||
104 | outb(PS2_CTRL_ENABLE, ps2if->base); | |
105 | pcips2_flush_input(ps2if); | |
106 | ||
dace1453 | 107 | ret = request_irq(ps2if->dev->irq, pcips2_interrupt, IRQF_SHARED, |
1da177e4 LT |
108 | "pcips2", ps2if); |
109 | if (ret == 0) | |
110 | val = PS2_CTRL_ENABLE | PS2_CTRL_RXIRQ; | |
111 | ||
112 | outb(val, ps2if->base); | |
113 | ||
114 | return ret; | |
115 | } | |
116 | ||
117 | static void pcips2_close(struct serio *io) | |
118 | { | |
119 | struct pcips2_data *ps2if = io->port_data; | |
120 | ||
121 | outb(0, ps2if->base); | |
122 | ||
123 | free_irq(ps2if->dev->irq, ps2if); | |
124 | } | |
125 | ||
5298cc4c | 126 | static int pcips2_probe(struct pci_dev *dev, const struct pci_device_id *id) |
1da177e4 LT |
127 | { |
128 | struct pcips2_data *ps2if; | |
129 | struct serio *serio; | |
130 | int ret; | |
131 | ||
132 | ret = pci_enable_device(dev); | |
133 | if (ret) | |
134 | goto out; | |
135 | ||
136 | ret = pci_request_regions(dev, "pcips2"); | |
137 | if (ret) | |
138 | goto disable; | |
139 | ||
dd00cc48 YP |
140 | ps2if = kzalloc(sizeof(struct pcips2_data), GFP_KERNEL); |
141 | serio = kzalloc(sizeof(struct serio), GFP_KERNEL); | |
1da177e4 LT |
142 | if (!ps2if || !serio) { |
143 | ret = -ENOMEM; | |
144 | goto release; | |
145 | } | |
146 | ||
1da177e4 LT |
147 | |
148 | serio->id.type = SERIO_8042; | |
149 | serio->write = pcips2_write; | |
150 | serio->open = pcips2_open; | |
151 | serio->close = pcips2_close; | |
152 | strlcpy(serio->name, pci_name(dev), sizeof(serio->name)); | |
a6c2490f | 153 | strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys)); |
1da177e4 LT |
154 | serio->port_data = ps2if; |
155 | serio->dev.parent = &dev->dev; | |
156 | ps2if->io = serio; | |
157 | ps2if->dev = dev; | |
158 | ps2if->base = pci_resource_start(dev, 0); | |
159 | ||
160 | pci_set_drvdata(dev, ps2if); | |
161 | ||
162 | serio_register_port(ps2if->io); | |
163 | return 0; | |
164 | ||
165 | release: | |
166 | kfree(ps2if); | |
167 | kfree(serio); | |
168 | pci_release_regions(dev); | |
169 | disable: | |
170 | pci_disable_device(dev); | |
171 | out: | |
172 | return ret; | |
173 | } | |
174 | ||
e2619cf7 | 175 | static void pcips2_remove(struct pci_dev *dev) |
1da177e4 LT |
176 | { |
177 | struct pcips2_data *ps2if = pci_get_drvdata(dev); | |
178 | ||
179 | serio_unregister_port(ps2if->io); | |
1da177e4 LT |
180 | kfree(ps2if); |
181 | pci_release_regions(dev); | |
182 | pci_disable_device(dev); | |
183 | } | |
184 | ||
a9844b18 | 185 | static const struct pci_device_id pcips2_ids[] = { |
1da177e4 LT |
186 | { |
187 | .vendor = 0x14f2, /* MOBILITY */ | |
188 | .device = 0x0123, /* Keyboard */ | |
189 | .subvendor = PCI_ANY_ID, | |
190 | .subdevice = PCI_ANY_ID, | |
191 | .class = PCI_CLASS_INPUT_KEYBOARD << 8, | |
192 | .class_mask = 0xffff00, | |
193 | }, | |
194 | { | |
195 | .vendor = 0x14f2, /* MOBILITY */ | |
196 | .device = 0x0124, /* Mouse */ | |
197 | .subvendor = PCI_ANY_ID, | |
198 | .subdevice = PCI_ANY_ID, | |
199 | .class = PCI_CLASS_INPUT_MOUSE << 8, | |
200 | .class_mask = 0xffff00, | |
201 | }, | |
202 | { 0, } | |
203 | }; | |
5d066474 | 204 | MODULE_DEVICE_TABLE(pci, pcips2_ids); |
1da177e4 LT |
205 | |
206 | static struct pci_driver pcips2_driver = { | |
207 | .name = "pcips2", | |
208 | .id_table = pcips2_ids, | |
209 | .probe = pcips2_probe, | |
1cb0aa88 | 210 | .remove = pcips2_remove, |
1da177e4 LT |
211 | }; |
212 | ||
5d066474 | 213 | module_pci_driver(pcips2_driver); |
1da177e4 LT |
214 | |
215 | MODULE_LICENSE("GPL"); | |
216 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
217 | MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver"); |