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[]; 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"); 202