Fixed MTP to work with TWRP

drivers/input/keyboard/goldfish_events.c

@@ -0,0 +1,193 @@
+/*
+ * 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>
+
+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");