1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/drivers/input/serio/pcips2.c |
4 | * |
5 | * Copyright (C) 2003 Russell King, All Rights Reserved. |
6 | * |
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> |
15 | #include <linux/slab.h> |
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(port: ps2if->base + PS2_STATUS); |
50 | cpu_relax(); |
51 | } while (!(stat & PS2_STAT_TXEMPTY)); |
52 | |
53 | outb(value: val, port: ps2if->base + PS2_DATA); |
54 | |
55 | return 0; |
56 | } |
57 | |
58 | static irqreturn_t pcips2_interrupt(int irq, void *devid) |
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(port: ps2if->base + PS2_STATUS); |
68 | if (!(status & PS2_STAT_RXFULL)) |
69 | break; |
70 | handled = 1; |
71 | scancode = inb(port: 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 | |
80 | serio_interrupt(serio: ps2if->io, data: scancode, flags: flag); |
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(port: ps2if->base + PS2_STATUS); |
91 | if (!(status & PS2_STAT_RXFULL)) |
92 | break; |
93 | scancode = inb(port: 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, port: ps2if->base); |
105 | pcips2_flush_input(ps2if); |
106 | |
107 | ret = request_irq(irq: ps2if->dev->irq, handler: pcips2_interrupt, IRQF_SHARED, |
108 | name: "pcips2" , dev: ps2if); |
109 | if (ret == 0) |
110 | val = PS2_CTRL_ENABLE | PS2_CTRL_RXIRQ; |
111 | |
112 | outb(value: val, port: 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(value: 0, port: ps2if->base); |
122 | |
123 | free_irq(ps2if->dev->irq, ps2if); |
124 | } |
125 | |
126 | static int pcips2_probe(struct pci_dev *dev, const struct pci_device_id *id) |
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 | |
140 | ps2if = kzalloc(size: sizeof(struct pcips2_data), GFP_KERNEL); |
141 | serio = kzalloc(size: sizeof(struct serio), GFP_KERNEL); |
142 | if (!ps2if || !serio) { |
143 | ret = -ENOMEM; |
144 | goto release; |
145 | } |
146 | |
147 | |
148 | serio->id.type = SERIO_8042; |
149 | serio->write = pcips2_write; |
150 | serio->open = pcips2_open; |
151 | serio->close = pcips2_close; |
152 | strscpy(p: serio->name, q: pci_name(pdev: dev), size: sizeof(serio->name)); |
153 | strscpy(p: serio->phys, q: dev_name(dev: &dev->dev), size: sizeof(serio->phys)); |
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(pdev: dev, data: ps2if); |
161 | |
162 | serio_register_port(ps2if->io); |
163 | return 0; |
164 | |
165 | release: |
166 | kfree(objp: ps2if); |
167 | kfree(objp: serio); |
168 | pci_release_regions(dev); |
169 | disable: |
170 | pci_disable_device(dev); |
171 | out: |
172 | return ret; |
173 | } |
174 | |
175 | static void pcips2_remove(struct pci_dev *dev) |
176 | { |
177 | struct pcips2_data *ps2if = pci_get_drvdata(pdev: dev); |
178 | |
179 | serio_unregister_port(serio: ps2if->io); |
180 | kfree(objp: ps2if); |
181 | pci_release_regions(dev); |
182 | pci_disable_device(dev); |
183 | } |
184 | |
185 | static const struct pci_device_id pcips2_ids[] = { |
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 | }; |
204 | MODULE_DEVICE_TABLE(pci, pcips2_ids); |
205 | |
206 | static struct pci_driver pcips2_driver = { |
207 | .name = "pcips2" , |
208 | .id_table = pcips2_ids, |
209 | .probe = pcips2_probe, |
210 | .remove = pcips2_remove, |
211 | }; |
212 | |
213 | module_pci_driver(pcips2_driver); |
214 | |
215 | MODULE_LICENSE("GPL" ); |
216 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>" ); |
217 | MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver" ); |
218 | |