From 6f2ac009f29bcbd468a7a2017912dd090abd1348 Mon Sep 17 00:00:00 2001 From: Brian Swetland Date: Wed, 23 Jan 2013 19:45:00 -0800 Subject: Input: goldfish - virtual input event driver This device is a direct pipe from "hardware" to the input event subsystem, allowing us to avoid having to route "keypad" style events through an AT keyboard driver (gross!). As with the other submissions this driver is cross architecture. Signed-off-by: Mike A. Chan [Tided up to work on x86] Signed-off-by: Sheng Yang Signed-off-by: Yunhong Jiang Signed-off-by: Xiaohui Xin Signed-off-by: Jun Nakajima Signed-off-by: Bruce Beare [Ported to 3.4] Signed-off-by: Tom Keel [Cleaned up for 3.7 and submission] Signed-off-by: Alan Cox Signed-off-by: Dmitry Torokhov diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index 4830964..95b6d03 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -479,6 +479,16 @@ config KEYBOARD_SAMSUNG To compile this driver as a module, choose M here: the module will be called samsung-keypad. +config KEYBOARD_GOLDFISH_EVENTS + depends on GOLDFISH + tristate "Generic Input Event device for Goldfish" + help + Say Y here to get an input event device for the Goldfish virtual + device emulator. + + To compile this driver as a module, choose M here: the + module will be called goldfish-events. + config KEYBOARD_STOWAWAY tristate "Stowaway keyboard" select SERIO diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index 44e7600..49b1645 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o +obj-$(CONFIG_KEYBOARD_GOLDFISH_EVENTS) += goldfish_events.o obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o obj-$(CONFIG_KEYBOARD_GPIO_POLLED) += gpio_keys_polled.o obj-$(CONFIG_KEYBOARD_TCA6416) += tca6416-keypad.o diff --git a/drivers/input/keyboard/goldfish_events.c b/drivers/input/keyboard/goldfish_events.c new file mode 100644 index 0000000..9f60a2e --- /dev/null +++ b/drivers/input/keyboard/goldfish_events.c @@ -0,0 +1,194 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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"); -- cgit v0.10.2