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