cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/keyboard/goldfish_events.c

/*
 * 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>
#include <linux/acpi.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; }

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Brian Swetland83100.00%1100.00%
Total83100.00%1100.00%


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); } }

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Brian Swetland132100.00%1100.00%
Total132100.00%1100.00%


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]); } }

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Brian Swetland184100.00%1100.00%
Total184100.00%1100.00%


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; }

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Brian Swetland417100.00%1100.00%
Total417100.00%1100.00%

static const struct of_device_id goldfish_events_of_match[] = { { .compatible = "google,goldfish-events-keypad", }, {}, }; MODULE_DEVICE_TABLE(of, goldfish_events_of_match); #ifdef CONFIG_ACPI static const struct acpi_device_id goldfish_events_acpi_match[] = { { "GFSH0002", 0 }, { }, }; MODULE_DEVICE_TABLE(acpi, goldfish_events_acpi_match); #endif static struct platform_driver events_driver = { .probe = events_probe, .driver = { .name = "goldfish_events", .of_match_table = goldfish_events_of_match, .acpi_match_table = ACPI_PTR(goldfish_events_acpi_match), }, }; module_platform_driver(events_driver); MODULE_AUTHOR("Brian Swetland"); MODULE_DESCRIPTION("Goldfish Event Device"); MODULE_LICENSE("GPL");

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Brian Swetland94393.09%133.33%
Jason Hu403.95%133.33%
Greg Hackmann302.96%133.33%
Total1013100.00%3100.00%
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