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path: root/drivers/media/video/cx231xx/cx231xx-input.c
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Diffstat (limited to 'drivers/media/video/cx231xx/cx231xx-input.c')
-rw-r--r--drivers/media/video/cx231xx/cx231xx-input.c246
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 000000000000..97e304c3c799
--- /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;
+}