Input: goldfish - virtual input event driver
authorBrian Swetland <swetland@google.com>
Thu, 24 Jan 2013 03:45:00 +0000 (19:45 -0800)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>
Fri, 25 Jan 2013 08:06:43 +0000 (00:06 -0800)
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>
drivers/input/keyboard/Kconfig
drivers/input/keyboard/Makefile
drivers/input/keyboard/goldfish_events.c [new file with mode: 0644]

index 48309641b1b2a496fef70b98979b4320c3e7c45b..95b6d0335e8f04a2540ecca63ee4077a84707dea 100644 (file)
@@ -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
index 44e76002f54bf3c4d7250c3ab345b70d89195ad4..49b16453d00ef84184d2beddbee95d7c3a3e33ea 100644 (file)
@@ -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 (file)
index 0000000..9f60a2e
--- /dev/null
@@ -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 <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");