+++ /dev/null
-/*
- handle cx231xx IR remotes via linux kernel input layer.
-
- Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
- Based on em28xx driver
-
- < This is a place holder for IR now.>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- 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.
-
- 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/input.h>
-#include <linux/usb.h>
-#include <linux/slab.h>
-
-#include "cx231xx.h"
-
-static unsigned int ir_debug;
-module_param(ir_debug, int, 0644);
-MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
-
-#define MODULE_NAME "cx231xx"
-
-#define i2cdprintk(fmt, arg...) \
- if (ir_debug) { \
- printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
- }
-
-#define dprintk(fmt, arg...) \
- if (ir_debug) { \
- printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
- }
-
-/**********************************************************
- Polling structure used by cx231xx IR's
- **********************************************************/
-
-struct cx231xx_ir_poll_result {
- unsigned int toggle_bit:1;
- unsigned int read_count:7;
- u8 rc_address;
- u8 rc_data[4];
-};
-
-struct cx231xx_IR {
- struct cx231xx *dev;
- struct input_dev *input;
- struct ir_input_state ir;
- char name[32];
- char phys[32];
-
- /* poll external decoder */
- int polling;
- struct work_struct work;
- struct timer_list timer;
- unsigned int last_toggle:1;
- unsigned int last_readcount;
- unsigned int repeat_interval;
-
- int (*get_key) (struct cx231xx_IR *, struct cx231xx_ir_poll_result *);
-};
-
-/**********************************************************
- Polling code for cx231xx
- **********************************************************/
-
-static void cx231xx_ir_handle_key(struct cx231xx_IR *ir)
-{
- int result;
- int do_sendkey = 0;
- struct cx231xx_ir_poll_result poll_result;
-
- /* read the registers containing the IR status */
- result = ir->get_key(ir, &poll_result);
- if (result < 0) {
- dprintk("ir->get_key() failed %d\n", result);
- return;
- }
-
- dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
- poll_result.toggle_bit, poll_result.read_count,
- ir->last_readcount, poll_result.rc_data[0]);
-
- if (ir->dev->chip_id == CHIP_ID_EM2874) {
- /* The em2874 clears the readcount field every time the
- register is read. The em2860/2880 datasheet says that it
- is supposed to clear the readcount, but it doesn't. So with
- the em2874, we are looking for a non-zero read count as
- opposed to a readcount that is incrementing */
- ir->last_readcount = 0;
- }
-
- if (poll_result.read_count == 0) {
- /* The button has not been pressed since the last read */
- } else if (ir->last_toggle != poll_result.toggle_bit) {
- /* A button has been pressed */
- dprintk("button has been pressed\n");
- ir->last_toggle = poll_result.toggle_bit;
- ir->repeat_interval = 0;
- do_sendkey = 1;
- } else if (poll_result.toggle_bit == ir->last_toggle &&
- poll_result.read_count > 0 &&
- poll_result.read_count != ir->last_readcount) {
- /* The button is still being held down */
- dprintk("button being held down\n");
-
- /* Debouncer for first keypress */
- if (ir->repeat_interval++ > 9) {
- /* Start repeating after 1 second */
- do_sendkey = 1;
- }
- }
-
- if (do_sendkey) {
- dprintk("sending keypress\n");
- ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0]);
- ir_input_nokey(ir->input, &ir->ir);
- }
-
- ir->last_readcount = poll_result.read_count;
- return;
-}
-
-static void ir_timer(unsigned long data)
-{
- struct cx231xx_IR *ir = (struct cx231xx_IR *)data;
-
- schedule_work(&ir->work);
-}
-
-static void cx231xx_ir_work(struct work_struct *work)
-{
- struct cx231xx_IR *ir = container_of(work, struct cx231xx_IR, work);
-
- cx231xx_ir_handle_key(ir);
- mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
-}
-
-void cx231xx_ir_start(struct cx231xx_IR *ir)
-{
- setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
- INIT_WORK(&ir->work, cx231xx_ir_work);
- schedule_work(&ir->work);
-}
-
-static void cx231xx_ir_stop(struct cx231xx_IR *ir)
-{
- del_timer_sync(&ir->timer);
- flush_scheduled_work();
-}
-
-int cx231xx_ir_init(struct cx231xx *dev)
-{
- struct cx231xx_IR *ir;
- struct input_dev *input_dev;
- u8 ir_config;
- int err = -ENOMEM;
-
- if (dev->board.ir_codes == NULL) {
- /* No remote control support */
- return 0;
- }
-
- ir = kzalloc(sizeof(*ir), GFP_KERNEL);
- input_dev = input_allocate_device();
- if (!ir || !input_dev)
- goto err_out_free;
-
- ir->input = input_dev;
-
- /* Setup the proper handler based on the chip */
- switch (dev->chip_id) {
- default:
- printk("Unrecognized cx231xx chip id: IR not supported\n");
- goto err_out_free;
- }
-
- /* This is how often we ask the chip for IR information */
- ir->polling = 100; /* ms */
-
- /* init input device */
- snprintf(ir->name, sizeof(ir->name), "cx231xx IR (%s)", dev->name);
-
- usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
- strlcat(ir->phys, "/input0", sizeof(ir->phys));
-
- err = ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER);
- if (err < 0)
- goto err_out_free;
-
- input_dev->name = ir->name;
- input_dev->phys = ir->phys;
- input_dev->id.bustype = BUS_USB;
- input_dev->id.version = 1;
- input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
- input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
-
- input_dev->dev.parent = &dev->udev->dev;
- /* record handles to ourself */
- ir->dev = dev;
- dev->ir = ir;
-
- cx231xx_ir_start(ir);
-
- /* all done */
- err = ir_input_register(ir->input, dev->board.ir_codes,
- NULL, MODULE_NAME);
- if (err)
- goto err_out_stop;
-
- return 0;
-err_out_stop:
- cx231xx_ir_stop(ir);
- dev->ir = NULL;
-err_out_free:
- kfree(ir);
- return err;
-}
-
-int cx231xx_ir_fini(struct cx231xx *dev)
-{
- struct cx231xx_IR *ir = dev->ir;
-
- /* skip detach on non attached boards */
- if (!ir)
- return 0;
-
- cx231xx_ir_stop(ir);
- ir_input_unregister(ir->input);
- kfree(ir);
-
- /* done */
- dev->ir = NULL;
- return 0;
-}
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff