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/*
* 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");
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