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 <mikechan@google.com> [Tided up to work on x86] Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Xiaohui Xin <xiaohui.xin@intel.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Bruce Beare <bruce.j.beare@intel.com> [Ported to 3.4] Signed-off-by: Tom Keel <thomas.keel@intel.com> [Cleaned up for 3.7 and submission] Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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 <mikechan@google.com> [Tided up to work on x86] Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Xiaohui Xin <xiaohui.xin@intel.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Bruce Beare <bruce.j.beare@intel.com> [Ported to 3.4] Signed-off-by: Tom Keel <thomas.keel@intel.com> [Cleaned up for 3.7 and submission] Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Brian Swetland · Dmitry Torokhov
1 parent cb696e7cf2
Showing 3 changed files with 205 additions and 0 deletions Side-by-side Diff
drivers/input/keyboard/Kconfig
drivers/input/keyboard/Makefile
drivers/input/keyboard/goldfish_events.c
@@ -479,6 +479,16 @@
 	  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
@@ -13,6 +13,7 @@
 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
+/*
+ * 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/init.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");
...	...	@@ -479,6 +479,16 @@
479	479	To compile this driver as a module, choose M here: the
480	480	module will be called samsung-keypad.
481	481
	482	+config KEYBOARD_GOLDFISH_EVENTS
	483	+ depends on GOLDFISH
	484	+ tristate "Generic Input Event device for Goldfish"
	485	+ help
	486	+ Say Y here to get an input event device for the Goldfish virtual
	487	+ device emulator.
	488	+
	489	+ To compile this driver as a module, choose M here: the
	490	+ module will be called goldfish-events.
	491	+
482	492	config KEYBOARD_STOWAWAY
483	493	tristate "Stowaway keyboard"
484	494	select SERIO
...	...	@@ -13,6 +13,7 @@
13	13	obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
14	14	obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
15	15	obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
	16	+obj-$(CONFIG_KEYBOARD_GOLDFISH_EVENTS) += goldfish_events.o
16	17	obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
17	18	obj-$(CONFIG_KEYBOARD_GPIO_POLLED) += gpio_keys_polled.o
18	19	obj-$(CONFIG_KEYBOARD_TCA6416) += tca6416-keypad.o
	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/init.h>
	18	+#include <linux/interrupt.h>
	19	+#include <linux/types.h>
	20	+#include <linux/input.h>
	21	+#include <linux/kernel.h>
	22	+#include <linux/platform_device.h>
	23	+#include <linux/slab.h>
	24	+#include <linux/irq.h>
	25	+#include <linux/io.h>
	26	+
	27	+enum {
	28	+ REG_READ = 0x00,
	29	+ REG_SET_PAGE = 0x00,
	30	+ REG_LEN = 0x04,
	31	+ REG_DATA = 0x08,
	32	+
	33	+ PAGE_NAME = 0x00000,
	34	+ PAGE_EVBITS = 0x10000,
	35	+ PAGE_ABSDATA = 0x20000 \| EV_ABS,
	36	+};
	37	+
	38	+struct event_dev {
	39	+ struct input_dev *input;
	40	+ int irq;
	41	+ void __iomem *addr;
	42	+ char name[0];
	43	+};
	44	+
	45	+static irqreturn_t events_interrupt(int irq, void *dev_id)
	46	+{
	47	+ struct event_dev *edev = dev_id;
	48	+ unsigned type, code, value;
	49	+
	50	+ type = __raw_readl(edev->addr + REG_READ);
	51	+ code = __raw_readl(edev->addr + REG_READ);
	52	+ value = __raw_readl(edev->addr + REG_READ);
	53	+
	54	+ input_event(edev->input, type, code, value);
	55	+ input_sync(edev->input);
	56	+ return IRQ_HANDLED;
	57	+}
	58	+
	59	+static void events_import_bits(struct event_dev *edev,
	60	+ unsigned long bits[], unsigned type, size_t count)
	61	+{
	62	+ void __iomem *addr = edev->addr;
	63	+ int i, j;
	64	+ size_t size;
	65	+ uint8_t val;
	66	+
	67	+ __raw_writel(PAGE_EVBITS \| type, addr + REG_SET_PAGE);
	68	+
	69	+ size = __raw_readl(addr + REG_LEN) * 8;
	70	+ if (size < count)
	71	+ count = size;
	72	+
	73	+ addr += REG_DATA;
	74	+ for (i = 0; i < count; i += 8) {
	75	+ val = __raw_readb(addr++);
	76	+ for (j = 0; j < 8; j++)
	77	+ if (val & 1 << j)
	78	+ set_bit(i + j, bits);
	79	+ }
	80	+}
	81	+
	82	+static void events_import_abs_params(struct event_dev *edev)
	83	+{
	84	+ struct input_dev *input_dev = edev->input;
	85	+ void __iomem *addr = edev->addr;
	86	+ u32 val[4];
	87	+ int count;
	88	+ int i, j;
	89	+
	90	+ __raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE);
	91	+
	92	+ count = __raw_readl(addr + REG_LEN) / sizeof(val);
	93	+ if (count > ABS_MAX)
	94	+ count = ABS_MAX;
	95	+
	96	+ for (i = 0; i < count; i++) {
	97	+ if (!test_bit(i, input_dev->absbit))
	98	+ continue;
	99	+
	100	+ for (j = 0; j < ARRAY_SIZE(val); j++) {
	101	+ int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32);
	102	+ val[j] = __raw_readl(edev->addr + REG_DATA + offset);
	103	+ }
	104	+
	105	+ input_set_abs_params(input_dev, i,
	106	+ val[0], val[1], val[2], val[3]);
	107	+ }
	108	+}
	109	+
	110	+static int events_probe(struct platform_device *pdev)
	111	+{
	112	+ struct input_dev *input_dev;
	113	+ struct event_dev *edev;
	114	+ struct resource *res;
	115	+ unsigned keymapnamelen;
	116	+ void __iomem *addr;
	117	+ int irq;
	118	+ int i;
	119	+ int error;
	120	+
	121	+ irq = platform_get_irq(pdev, 0);
	122	+ if (irq < 0)
	123	+ return -EINVAL;
	124	+
	125	+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	126	+ if (!res)
	127	+ return -EINVAL;
	128	+
	129	+ addr = devm_ioremap(&pdev->dev, res->start, 4096);
	130	+ if (!addr)
	131	+ return -ENOMEM;
	132	+
	133	+ __raw_writel(PAGE_NAME, addr + REG_SET_PAGE);
	134	+ keymapnamelen = __raw_readl(addr + REG_LEN);
	135	+
	136	+ edev = devm_kzalloc(&pdev->dev,
	137	+ sizeof(struct event_dev) + keymapnamelen + 1,
	138	+ GFP_KERNEL);
	139	+ if (!edev)
	140	+ return -ENOMEM;
	141	+
	142	+ input_dev = devm_input_allocate_device(&pdev->dev);
	143	+ if (!input_dev)
	144	+ return -ENOMEM;
	145	+
	146	+ edev->input = input_dev;
	147	+ edev->addr = addr;
	148	+ edev->irq = irq;
	149	+
	150	+ for (i = 0; i < keymapnamelen; i++)
	151	+ edev->name[i] = __raw_readb(edev->addr + REG_DATA + i);
	152	+
	153	+ pr_debug("events_probe() keymap=%s\n", edev->name);
	154	+
	155	+ input_dev->name = edev->name;
	156	+ input_dev->id.bustype = BUS_HOST;
	157	+
	158	+ events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX);
	159	+ events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX);
	160	+ events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX);
	161	+ events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX);
	162	+ events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX);
	163	+ events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX);
	164	+ events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX);
	165	+ events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX);
	166	+ events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX);
	167	+
	168	+ events_import_abs_params(edev);
	169	+
	170	+ error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0,
	171	+ "goldfish-events-keypad", edev);
	172	+ if (error)
	173	+ return error;
	174	+
	175	+ error = input_register_device(input_dev);
	176	+ if (error)
	177	+ return error;
	178	+
	179	+ return 0;
	180	+}
	181	+
	182	+static struct platform_driver events_driver = {
	183	+ .probe = events_probe,
	184	+ .driver = {
	185	+ .owner = THIS_MODULE,
	186	+ .name = "goldfish_events",
	187	+ },
	188	+};
	189	+
	190	+module_platform_driver(events_driver);
	191	+
	192	+MODULE_AUTHOR("Brian Swetland");
	193	+MODULE_DESCRIPTION("Goldfish Event Device");
	194	+MODULE_LICENSE("GPL");