From f5978b5a9701fe1ddeffa0c5f73923fcaf31129e Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Wed, 12 May 2010 14:23:43 +0200
Subject: [PATCH] Add n526 lpc driver

---
 drivers/misc/Kconfig    |    9 ++
 drivers/misc/Makefile   |    1 +
 drivers/misc/n526-lpc.c |  237 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 247 insertions(+), 0 deletions(-)
 create mode 100644 drivers/misc/n526-lpc.c

--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -361,6 +361,15 @@ config N516_LPC
 	help
 	  N516 keyboard & power controller driver
 
+config N526_LPC
+	tristate "N526 LPC934 coprocessor"
+	depends on JZ4740_N526
+	help
+	  If you say yes here you get support for the N526s NXP LPC934 coprocessor.
+	  It is used as a keyboard controllor and for power management.
+
+	  If you have a N526 you probably want to say Y here.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -32,3 +32,4 @@ obj-y				+= eeprom/
 obj-y				+= cb710/
 obj-$(CONFIG_VMWARE_BALLOON)	+= vmware_balloon.o
 obj-$(CONFIG_N516_LPC)		+= n516-lpc.o
+obj-$(CONFIG_N526_LPC)		+= n526-lpc.o
--- /dev/null
+++ b/drivers/misc/n526-lpc.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include <linux/workqueue.h>
+
+#include <asm/mach-jz4740/irq.h>
+#include <asm/mach-jz4740/gpio.h>
+
+struct n526_lpc {
+	struct i2c_client *client;
+	struct input_dev *input;
+
+	struct work_struct work;
+};
+
+static const unsigned int n526_lpc_keymap[] = {
+	[0x01] = KEY_PAGEUP,
+	[0x02] = KEY_PAGEDOWN,
+	[0x03] = KEY_VOLUMEUP,
+	[0x04] = KEY_VOLUMEDOWN,
+	[0x06] = KEY_1,
+	[0x07] = KEY_Q,
+	[0x08] = KEY_A,
+	[0x09] = KEY_Z,
+	[0x0a] = KEY_LEFTSHIFT,
+	[0x0b] = KEY_2,
+	[0x0c] = KEY_W,
+	[0x0d] = KEY_S,
+	[0x0e] = KEY_X,
+	[0x0f] = KEY_REFRESH,
+	[0x10] = KEY_3,
+	[0x11] = KEY_E,
+	[0x12] = KEY_D,
+	[0x13] = KEY_C,
+	[0x14] = KEY_DOCUMENTS,
+	[0x15] = KEY_4,
+	[0x16] = KEY_R,
+	[0x17] = KEY_F,
+	[0x18] = KEY_V,
+	[0x19] = KEY_MUTE,
+	[0x1a] = KEY_5,
+	[0x1b] = KEY_T,
+	[0x1c] = KEY_G,
+	[0x1d] = KEY_B,
+	[0x1e] = KEY_DELETE,
+	[0x1f] = KEY_6,
+	[0x20] = KEY_Y,
+	[0x21] = KEY_H,
+	[0x22] = KEY_N,
+	[0x23] = KEY_SPACE,
+	[0x24] = KEY_7,
+	[0x25] = KEY_U,
+	[0x26] = KEY_J,
+	[0x27] = KEY_M,
+/*	[0x28] = KEY_SYM, */
+	[0x29] = KEY_8,
+	[0x2a] = KEY_I,
+	[0x2b] = KEY_K,
+	[0x2c] = KEY_MENU,
+	[0x2d] = KEY_LEFT,
+	[0x2e] = KEY_9,
+	[0x2f] = KEY_O,
+	[0x30] = KEY_L,
+	[0x31] = KEY_UP,
+	[0x32] = KEY_DOWN,
+	[0x33] = KEY_0,
+	[0x34] = KEY_P,
+	[0x35] = KEY_BACKSPACE,
+	[0x36] = KEY_ENTER,
+	[0x37] = KEY_RIGHT,
+};
+
+static void n526_lpc_irq_work(struct work_struct *work)
+{
+	int ret;
+	struct n526_lpc *n526_lpc = container_of(work, struct n526_lpc, work);
+	struct i2c_client *client = n526_lpc->client;
+	unsigned char raw_msg;
+	struct i2c_msg msg = {client->addr, client->flags | I2C_M_RD, 1, &raw_msg};
+	unsigned char keycode;
+
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+
+	if (ret != 1) {
+		dev_err(&client->dev, "Failed to read lpc status\n");
+	}
+
+	keycode = raw_msg & 0x7f;
+
+	if (keycode < ARRAY_SIZE(n526_lpc_keymap)) {
+		input_report_key(n526_lpc->input, n526_lpc_keymap[keycode],
+		                 !(raw_msg & 0x80));
+		input_sync(n526_lpc->input);
+	}
+}
+
+static irqreturn_t n526_lpc_irq(int irq, void *dev_id)
+{
+	struct n526_lpc *n526_lpc = dev_id;
+
+	schedule_work(&n526_lpc->work);
+	return IRQ_HANDLED;
+}
+
+static int __devinit n526_lpc_probe(struct i2c_client *client,
+		const struct i2c_device_id *id)
+{
+	int ret;
+	size_t i;
+	struct n526_lpc *n526_lpc;
+	struct input_dev *input;
+
+	n526_lpc = kmalloc(sizeof(*n526_lpc), GFP_KERNEL);
+
+	if (!n526_lpc) {
+		dev_err(&client->dev, "Failed to allocate device structure\n");
+		return -ENOMEM;
+	}
+
+	input = input_allocate_device();
+	if (!input) {
+		dev_err(&client->dev, "Failed to allocate input device\n");
+		ret = -ENOMEM;
+		goto err_free;
+	}
+
+	input->name = "n526-keys";
+	input->phys = "n526-keys/input0";
+	input->dev.parent = &client->dev;
+	input->id.bustype = BUS_I2C;
+	input->id.vendor  = 0x0001;
+	input->id.product = 0x0001;
+	input->id.version = 0x0001;
+
+	__set_bit(EV_KEY, input->evbit);
+
+	for (i = 0; i < ARRAY_SIZE(n526_lpc_keymap); ++i) {
+		if (n526_lpc_keymap[i] != 0)
+			__set_bit(n526_lpc_keymap[i], input->keybit);
+	}
+
+	ret = input_register_device(input);
+
+	if (ret) {
+		dev_err(&client->dev, "Failed to register input device: %d\n", ret);
+		goto err_free_input;
+	}
+
+	n526_lpc->client = client;
+	n526_lpc->input  = input;
+	INIT_WORK(&n526_lpc->work, n526_lpc_irq_work);
+
+	ret = request_irq(client->irq, n526_lpc_irq, IRQF_TRIGGER_FALLING,
+	                  "n526-lpc", n526_lpc);
+	if (ret) {
+		dev_err(&client->dev, "Failed to request irq: %d\n", ret);
+		goto err_unregister_input;
+	}
+
+	i2c_set_clientdata(client, n526_lpc);
+
+	return 0;
+
+err_unregister_input:
+	input_unregister_device(input);
+err_free_input:
+	input_free_device(input);
+err_free:
+	kfree(n526_lpc);
+
+	return ret;
+}
+
+static int n526_lpc_remove(struct i2c_client *client)
+{
+	struct n526_lpc *n526_lpc = i2c_get_clientdata(client);
+
+	free_irq(client->irq, n526_lpc);
+
+	i2c_set_clientdata(client, NULL);
+   	input_unregister_device(n526_lpc->input);
+	input_free_device(n526_lpc->input);
+	kfree(n526_lpc);
+
+ return 0;
+}
+
+static const struct i2c_device_id n526_lpc_id[] = {
+	{ "n526-lpc", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, n526_lpc_id);
+
+static struct i2c_driver n526_lpc_driver = {
+	.driver = {
+		.name = "n526-lpc",
+		.owner = THIS_MODULE,
+	},
+	.probe = n526_lpc_probe,
+	.remove = n526_lpc_remove,
+	.id_table = n526_lpc_id,
+};
+
+static int __init n526_lpc_init(void)
+{
+	return i2c_add_driver(&n526_lpc_driver);
+}
+module_init(n526_lpc_init);
+
+static void __exit n526_lpc_exit(void)
+{
+	i2c_del_driver(&n526_lpc_driver);
+}
+module_exit(n526_lpc_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen");
+MODULE_DESCRIPTION("n526 keypad driver");
+MODULE_ALIAS("i2c:n526-keys");
