release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/media/video/cx231xx/cx231xx-input.c

   1 /*
   2   handle cx231xx IR remotes via linux kernel input layer.
   3
   4   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
   5                 Based on em28xx driver
   6
   7                 < This is a place holder for IR now.>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/input.h>
  29 #include <linux/usb.h>
  30 #include <linux/slab.h>
  31
  32 #include "cx231xx.h"
  33
  34 static unsigned int ir_debug;
  35 module_param(ir_debug, int, 0644);
  36 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
  37
  38 #define MODULE_NAME "cx231xx"
  39
  40 #define i2cdprintk(fmt, arg...) \
  41         if (ir_debug) { \
  42                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  43         }
  44
  45 #define dprintk(fmt, arg...) \
  46         if (ir_debug) { \
  47                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  48         }
  49
  50 /**********************************************************
  51  Polling structure used by cx231xx IR's
  52  **********************************************************/
  53
  54 struct cx231xx_ir_poll_result {
  55         unsigned int toggle_bit:1;
  56         unsigned int read_count:7;
  57         u8 rc_address;
  58         u8 rc_data[4];
  59 };
  60
  61 struct cx231xx_IR {
  62         struct cx231xx *dev;
  63         struct input_dev *input;
  64         char name[32];
  65         char phys[32];
  66
  67         /* poll external decoder */
  68         int polling;
  69         struct work_struct work;
  70         struct timer_list timer;
  71         unsigned int last_readcount;
  72
  73         int (*get_key) (struct cx231xx_IR *, struct cx231xx_ir_poll_result *);
  74 };
  75
  76 /**********************************************************
  77  Polling code for cx231xx
  78  **********************************************************/
  79
  80 static void cx231xx_ir_handle_key(struct cx231xx_IR *ir)
  81 {
  82         int result;
  83         struct cx231xx_ir_poll_result poll_result;
  84
  85         /* read the registers containing the IR status */
  86         result = ir->get_key(ir, &poll_result);
  87         if (result < 0) {
  88                 dprintk("ir->get_key() failed %d\n", result);
  89                 return;
  90         }
  91
  92         dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
  93                 poll_result.toggle_bit, poll_result.read_count,
  94                 ir->last_readcount, poll_result.rc_data[0]);
  95
  96         if (poll_result.read_count > 0 &&
  97             poll_result.read_count != ir->last_readcount)
  98                 ir_keydown(ir->input,
  99                            poll_result.rc_data[0],
 100                            poll_result.toggle_bit);
 101
 102         if (ir->dev->chip_id == CHIP_ID_EM2874)
 103                 /* The em2874 clears the readcount field every time the
 104                    register is read.  The em2860/2880 datasheet says that it
 105                    is supposed to clear the readcount, but it doesn't.  So with
 106                    the em2874, we are looking for a non-zero read count as
 107                    opposed to a readcount that is incrementing */
 108                 ir->last_readcount = 0;
 109         else
 110                 ir->last_readcount = poll_result.read_count;
 111
 112         }
 113 }
 114
 115 static void ir_timer(unsigned long data)
 116 {
 117         struct cx231xx_IR *ir = (struct cx231xx_IR *)data;
 118
 119         schedule_work(&ir->work);
 120 }
 121
 122 static void cx231xx_ir_work(struct work_struct *work)
 123 {
 124         struct cx231xx_IR *ir = container_of(work, struct cx231xx_IR, work);
 125
 126         cx231xx_ir_handle_key(ir);
 127         mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
 128 }
 129
 130 void cx231xx_ir_start(struct cx231xx_IR *ir)
 131 {
 132         setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
 133         INIT_WORK(&ir->work, cx231xx_ir_work);
 134         schedule_work(&ir->work);
 135 }
 136
 137 static void cx231xx_ir_stop(struct cx231xx_IR *ir)
 138 {
 139         del_timer_sync(&ir->timer);
 140         flush_scheduled_work();
 141 }
 142
 143 int cx231xx_ir_init(struct cx231xx *dev)
 144 {
 145         struct cx231xx_IR *ir;
 146         struct input_dev *input_dev;
 147         u8 ir_config;
 148         int err = -ENOMEM;
 149
 150         if (dev->board.ir_codes == NULL) {
 151                 /* No remote control support */
 152                 return 0;
 153         }
 154
 155         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 156         input_dev = input_allocate_device();
 157         if (!ir || !input_dev)
 158                 goto err_out_free;
 159
 160         ir->input = input_dev;
 161
 162         /* Setup the proper handler based on the chip */
 163         switch (dev->chip_id) {
 164         default:
 165                 printk("Unrecognized cx231xx chip id: IR not supported\n");
 166                 goto err_out_free;
 167         }
 168
 169         /* This is how often we ask the chip for IR information */
 170         ir->polling = 100;      /* ms */
 171
 172         /* init input device */
 173         snprintf(ir->name, sizeof(ir->name), "cx231xx IR (%s)", dev->name);
 174
 175         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 176         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 177
 178         input_dev->name = ir->name;
 179         input_dev->phys = ir->phys;
 180         input_dev->id.bustype = BUS_USB;
 181         input_dev->id.version = 1;
 182         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 183         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 184
 185         input_dev->dev.parent = &dev->udev->dev;
 186         /* record handles to ourself */
 187         ir->dev = dev;
 188         dev->ir = ir;
 189
 190         cx231xx_ir_start(ir);
 191
 192         /* all done */
 193         err = __ir_input_register(ir->input, dev->board.ir_codes,
 194                                 NULL, MODULE_NAME);
 195         if (err)
 196                 goto err_out_stop;
 197
 198         return 0;
 199 err_out_stop:
 200         cx231xx_ir_stop(ir);
 201         dev->ir = NULL;
 202 err_out_free:
 203         kfree(ir);
 204         return err;
 205 }
 206
 207 int cx231xx_ir_fini(struct cx231xx *dev)
 208 {
 209         struct cx231xx_IR *ir = dev->ir;
 210
 211         /* skip detach on non attached boards */
 212         if (!ir)
 213                 return 0;
 214
 215         cx231xx_ir_stop(ir);
 216         ir_input_unregister(ir->input);
 217         kfree(ir);
 218
 219         /* done */
 220         dev->ir = NULL;
 221         return 0;
 222 }