1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/media/video/cx231xx/cx231xx-input.c b/drivers/media/video/cx231xx/cx231xx-input.c
new file mode 100644
index 00000000000..97e304c3c79
--- /dev/null
+++ b/drivers/media/video/cx231xx/cx231xx-input.c
@@ -0,0 +1,246 @@
+/*
+  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 "cx231xx.h"
+
+static unsigned int ir_debug;
+module_param(ir_debug, int, 0644);
+MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
+
+#define i2cdprintk(fmt, arg...) \
+	if (ir_debug) { \
+		printk(KERN_DEBUG "%s/ir: " fmt, ir->c.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],
+				 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));
+
+	ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
+	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 = input_register_device(ir->input);
+	if (err)
+		goto err_out_stop;
+
+	return 0;
+err_out_stop:
+	cx231xx_ir_stop(ir);
+	dev->ir = NULL;
+err_out_free:
+	input_free_device(input_dev);
+	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);
+	input_unregister_device(ir->input);
+	kfree(ir);
+
+	/* done */
+	dev->ir = NULL;
+	return 0;
+}