Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / input / keyboard / goldfish_events.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2007 Google, Inc.
4  * Copyright (C) 2012 Intel, Inc.
5  */
6
7 #include <linux/module.h>
8 #include <linux/interrupt.h>
9 #include <linux/types.h>
10 #include <linux/input.h>
11 #include <linux/kernel.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14 #include <linux/irq.h>
15 #include <linux/io.h>
16 #include <linux/acpi.h>
17
18 enum {
19         REG_READ        = 0x00,
20         REG_SET_PAGE    = 0x00,
21         REG_LEN         = 0x04,
22         REG_DATA        = 0x08,
23
24         PAGE_NAME       = 0x00000,
25         PAGE_EVBITS     = 0x10000,
26         PAGE_ABSDATA    = 0x20000 | EV_ABS,
27 };
28
29 struct event_dev {
30         struct input_dev *input;
31         int irq;
32         void __iomem *addr;
33         char name[0];
34 };
35
36 static irqreturn_t events_interrupt(int irq, void *dev_id)
37 {
38         struct event_dev *edev = dev_id;
39         unsigned int type, code, value;
40
41         type = __raw_readl(edev->addr + REG_READ);
42         code = __raw_readl(edev->addr + REG_READ);
43         value = __raw_readl(edev->addr + REG_READ);
44
45         input_event(edev->input, type, code, value);
46         input_sync(edev->input);
47         return IRQ_HANDLED;
48 }
49
50 static void events_import_bits(struct event_dev *edev,
51                         unsigned long bits[], unsigned int type, size_t count)
52 {
53         void __iomem *addr = edev->addr;
54         int i, j;
55         size_t size;
56         uint8_t val;
57
58         __raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE);
59
60         size = __raw_readl(addr + REG_LEN) * 8;
61         if (size < count)
62                 count = size;
63
64         addr += REG_DATA;
65         for (i = 0; i < count; i += 8) {
66                 val = __raw_readb(addr++);
67                 for (j = 0; j < 8; j++)
68                         if (val & 1 << j)
69                                 set_bit(i + j, bits);
70         }
71 }
72
73 static void events_import_abs_params(struct event_dev *edev)
74 {
75         struct input_dev *input_dev = edev->input;
76         void __iomem *addr = edev->addr;
77         u32 val[4];
78         int count;
79         int i, j;
80
81         __raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE);
82
83         count = __raw_readl(addr + REG_LEN) / sizeof(val);
84         if (count > ABS_MAX)
85                 count = ABS_MAX;
86
87         for (i = 0; i < count; i++) {
88                 if (!test_bit(i, input_dev->absbit))
89                         continue;
90
91                 for (j = 0; j < ARRAY_SIZE(val); j++) {
92                         int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32);
93
94                         val[j] = __raw_readl(edev->addr + REG_DATA + offset);
95                 }
96
97                 input_set_abs_params(input_dev, i,
98                                      val[0], val[1], val[2], val[3]);
99         }
100 }
101
102 static int events_probe(struct platform_device *pdev)
103 {
104         struct input_dev *input_dev;
105         struct event_dev *edev;
106         struct resource *res;
107         unsigned int keymapnamelen;
108         void __iomem *addr;
109         int irq;
110         int i;
111         int error;
112
113         irq = platform_get_irq(pdev, 0);
114         if (irq < 0)
115                 return -EINVAL;
116
117         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
118         if (!res)
119                 return -EINVAL;
120
121         addr = devm_ioremap(&pdev->dev, res->start, 4096);
122         if (!addr)
123                 return -ENOMEM;
124
125         __raw_writel(PAGE_NAME, addr + REG_SET_PAGE);
126         keymapnamelen = __raw_readl(addr + REG_LEN);
127
128         edev = devm_kzalloc(&pdev->dev,
129                             sizeof(struct event_dev) + keymapnamelen + 1,
130                             GFP_KERNEL);
131         if (!edev)
132                 return -ENOMEM;
133
134         input_dev = devm_input_allocate_device(&pdev->dev);
135         if (!input_dev)
136                 return -ENOMEM;
137
138         edev->input = input_dev;
139         edev->addr = addr;
140         edev->irq = irq;
141
142         for (i = 0; i < keymapnamelen; i++)
143                 edev->name[i] = __raw_readb(edev->addr + REG_DATA + i);
144
145         pr_debug("%s: keymap=%s\n", __func__, edev->name);
146
147         input_dev->name = edev->name;
148         input_dev->id.bustype = BUS_HOST;
149
150         events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX);
151         events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX);
152         events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX);
153         events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX);
154         events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX);
155         events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX);
156         events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX);
157         events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX);
158         events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX);
159
160         events_import_abs_params(edev);
161
162         error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0,
163                                  "goldfish-events-keypad", edev);
164         if (error)
165                 return error;
166
167         error = input_register_device(input_dev);
168         if (error)
169                 return error;
170
171         return 0;
172 }
173
174 static const struct of_device_id goldfish_events_of_match[] = {
175         { .compatible = "google,goldfish-events-keypad", },
176         {},
177 };
178 MODULE_DEVICE_TABLE(of, goldfish_events_of_match);
179
180 #ifdef CONFIG_ACPI
181 static const struct acpi_device_id goldfish_events_acpi_match[] = {
182         { "GFSH0002", 0 },
183         { },
184 };
185 MODULE_DEVICE_TABLE(acpi, goldfish_events_acpi_match);
186 #endif
187
188 static struct platform_driver events_driver = {
189         .probe  = events_probe,
190         .driver = {
191                 .name   = "goldfish_events",
192                 .of_match_table = goldfish_events_of_match,
193                 .acpi_match_table = ACPI_PTR(goldfish_events_acpi_match),
194         },
195 };
196
197 module_platform_driver(events_driver);
198
199 MODULE_AUTHOR("Brian Swetland");
200 MODULE_DESCRIPTION("Goldfish Event Device");
201 MODULE_LICENSE("GPL");