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Linux/drivers/input/keyboard/goldfish_events.c

  1 /*
  2  * Copyright (C) 2007 Google, Inc.
  3  * Copyright (C) 2012 Intel, Inc.
  4  *
  5  * This software is licensed under the terms of the GNU General Public
  6  * License version 2, as published by the Free Software Foundation, and
  7  * may be copied, distributed, and modified under those terms.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/interrupt.h>
 18 #include <linux/types.h>
 19 #include <linux/input.h>
 20 #include <linux/kernel.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/slab.h>
 23 #include <linux/irq.h>
 24 #include <linux/io.h>
 25 
 26 enum {
 27         REG_READ        = 0x00,
 28         REG_SET_PAGE    = 0x00,
 29         REG_LEN         = 0x04,
 30         REG_DATA        = 0x08,
 31 
 32         PAGE_NAME       = 0x00000,
 33         PAGE_EVBITS     = 0x10000,
 34         PAGE_ABSDATA    = 0x20000 | EV_ABS,
 35 };
 36 
 37 struct event_dev {
 38         struct input_dev *input;
 39         int irq;
 40         void __iomem *addr;
 41         char name[0];
 42 };
 43 
 44 static irqreturn_t events_interrupt(int irq, void *dev_id)
 45 {
 46         struct event_dev *edev = dev_id;
 47         unsigned type, code, value;
 48 
 49         type = __raw_readl(edev->addr + REG_READ);
 50         code = __raw_readl(edev->addr + REG_READ);
 51         value = __raw_readl(edev->addr + REG_READ);
 52 
 53         input_event(edev->input, type, code, value);
 54         input_sync(edev->input);
 55         return IRQ_HANDLED;
 56 }
 57 
 58 static void events_import_bits(struct event_dev *edev,
 59                         unsigned long bits[], unsigned type, size_t count)
 60 {
 61         void __iomem *addr = edev->addr;
 62         int i, j;
 63         size_t size;
 64         uint8_t val;
 65 
 66         __raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE);
 67 
 68         size = __raw_readl(addr + REG_LEN) * 8;
 69         if (size < count)
 70                 count = size;
 71 
 72         addr += REG_DATA;
 73         for (i = 0; i < count; i += 8) {
 74                 val = __raw_readb(addr++);
 75                 for (j = 0; j < 8; j++)
 76                         if (val & 1 << j)
 77                                 set_bit(i + j, bits);
 78         }
 79 }
 80 
 81 static void events_import_abs_params(struct event_dev *edev)
 82 {
 83         struct input_dev *input_dev = edev->input;
 84         void __iomem *addr = edev->addr;
 85         u32 val[4];
 86         int count;
 87         int i, j;
 88 
 89         __raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE);
 90 
 91         count = __raw_readl(addr + REG_LEN) / sizeof(val);
 92         if (count > ABS_MAX)
 93                 count = ABS_MAX;
 94 
 95         for (i = 0; i < count; i++) {
 96                 if (!test_bit(i, input_dev->absbit))
 97                         continue;
 98 
 99                 for (j = 0; j < ARRAY_SIZE(val); j++) {
100                         int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32);
101                         val[j] = __raw_readl(edev->addr + REG_DATA + offset);
102                 }
103 
104                 input_set_abs_params(input_dev, i,
105                                      val[0], val[1], val[2], val[3]);
106         }
107 }
108 
109 static int events_probe(struct platform_device *pdev)
110 {
111         struct input_dev *input_dev;
112         struct event_dev *edev;
113         struct resource *res;
114         unsigned keymapnamelen;
115         void __iomem *addr;
116         int irq;
117         int i;
118         int error;
119 
120         irq = platform_get_irq(pdev, 0);
121         if (irq < 0)
122                 return -EINVAL;
123 
124         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
125         if (!res)
126                 return -EINVAL;
127 
128         addr = devm_ioremap(&pdev->dev, res->start, 4096);
129         if (!addr)
130                 return -ENOMEM;
131 
132         __raw_writel(PAGE_NAME, addr + REG_SET_PAGE);
133         keymapnamelen = __raw_readl(addr + REG_LEN);
134 
135         edev = devm_kzalloc(&pdev->dev,
136                             sizeof(struct event_dev) + keymapnamelen + 1,
137                             GFP_KERNEL);
138         if (!edev)
139                 return -ENOMEM;
140 
141         input_dev = devm_input_allocate_device(&pdev->dev);
142         if (!input_dev)
143                 return -ENOMEM;
144 
145         edev->input = input_dev;
146         edev->addr = addr;
147         edev->irq = irq;
148 
149         for (i = 0; i < keymapnamelen; i++)
150                 edev->name[i] = __raw_readb(edev->addr + REG_DATA + i);
151 
152         pr_debug("events_probe() keymap=%s\n", edev->name);
153 
154         input_dev->name = edev->name;
155         input_dev->id.bustype = BUS_HOST;
156 
157         events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX);
158         events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX);
159         events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX);
160         events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX);
161         events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX);
162         events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX);
163         events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX);
164         events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX);
165         events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX);
166 
167         events_import_abs_params(edev);
168 
169         error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0,
170                                  "goldfish-events-keypad", edev);
171         if (error)
172                 return error;
173 
174         error = input_register_device(input_dev);
175         if (error)
176                 return error;
177 
178         return 0;
179 }
180 
181 static struct platform_driver events_driver = {
182         .probe  = events_probe,
183         .driver = {
184                 .owner  = THIS_MODULE,
185                 .name   = "goldfish_events",
186         },
187 };
188 
189 module_platform_driver(events_driver);
190 
191 MODULE_AUTHOR("Brian Swetland");
192 MODULE_DESCRIPTION("Goldfish Event Device");
193 MODULE_LICENSE("GPL");
194 

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