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