2 handle cx231xx IR remotes via linux kernel input layer.
4 Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
7 < This is a place holder for IR now.>
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.
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.
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
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>
34 static unsigned int ir_debug
;
35 module_param(ir_debug
, int, 0644);
36 MODULE_PARM_DESC(ir_debug
, "enable debug messages [IR]");
38 #define MODULE_NAME "cx231xx"
40 #define i2cdprintk(fmt, arg...) \
42 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
45 #define dprintk(fmt, arg...) \
47 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
50 /**********************************************************
51 Polling structure used by cx231xx IR's
52 **********************************************************/
54 struct cx231xx_ir_poll_result
{
55 unsigned int toggle_bit
:1;
56 unsigned int read_count
:7;
63 struct input_dev
*input
;
67 /* poll external decoder */
69 struct work_struct work
;
70 struct timer_list timer
;
71 unsigned int last_readcount
;
73 int (*get_key
) (struct cx231xx_IR
*, struct cx231xx_ir_poll_result
*);
76 /**********************************************************
77 Polling code for cx231xx
78 **********************************************************/
80 static void cx231xx_ir_handle_key(struct cx231xx_IR
*ir
)
83 struct cx231xx_ir_poll_result poll_result
;
85 /* read the registers containing the IR status */
86 result
= ir
->get_key(ir
, &poll_result
);
88 dprintk("ir->get_key() failed %d\n", result
);
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]);
96 if (poll_result
.read_count
> 0 &&
97 poll_result
.read_count
!= ir
->last_readcount
)
99 poll_result
.rc_data
[0],
100 poll_result
.toggle_bit
);
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;
110 ir
->last_readcount
= poll_result
.read_count
;
115 static void ir_timer(unsigned long data
)
117 struct cx231xx_IR
*ir
= (struct cx231xx_IR
*)data
;
119 schedule_work(&ir
->work
);
122 static void cx231xx_ir_work(struct work_struct
*work
)
124 struct cx231xx_IR
*ir
= container_of(work
, struct cx231xx_IR
, work
);
126 cx231xx_ir_handle_key(ir
);
127 mod_timer(&ir
->timer
, jiffies
+ msecs_to_jiffies(ir
->polling
));
130 void cx231xx_ir_start(struct cx231xx_IR
*ir
)
132 setup_timer(&ir
->timer
, ir_timer
, (unsigned long)ir
);
133 INIT_WORK(&ir
->work
, cx231xx_ir_work
);
134 schedule_work(&ir
->work
);
137 static void cx231xx_ir_stop(struct cx231xx_IR
*ir
)
139 del_timer_sync(&ir
->timer
);
140 flush_scheduled_work();
143 int cx231xx_ir_init(struct cx231xx
*dev
)
145 struct cx231xx_IR
*ir
;
146 struct input_dev
*input_dev
;
150 if (dev
->board
.ir_codes
== NULL
) {
151 /* No remote control support */
155 ir
= kzalloc(sizeof(*ir
), GFP_KERNEL
);
156 input_dev
= input_allocate_device();
157 if (!ir
|| !input_dev
)
160 ir
->input
= input_dev
;
162 /* Setup the proper handler based on the chip */
163 switch (dev
->chip_id
) {
165 printk("Unrecognized cx231xx chip id: IR not supported\n");
169 /* This is how often we ask the chip for IR information */
170 ir
->polling
= 100; /* ms */
172 /* init input device */
173 snprintf(ir
->name
, sizeof(ir
->name
), "cx231xx IR (%s)", dev
->name
);
175 usb_make_path(dev
->udev
, ir
->phys
, sizeof(ir
->phys
));
176 strlcat(ir
->phys
, "/input0", sizeof(ir
->phys
));
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
);
185 input_dev
->dev
.parent
= &dev
->udev
->dev
;
186 /* record handles to ourself */
190 cx231xx_ir_start(ir
);
193 err
= __ir_input_register(ir
->input
, dev
->board
.ir_codes
,
207 int cx231xx_ir_fini(struct cx231xx
*dev
)
209 struct cx231xx_IR
*ir
= dev
->ir
;
211 /* skip detach on non attached boards */
216 ir_input_unregister(ir
->input
);