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;
+}