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>
33 static unsigned int ir_debug;
34 module_param(ir_debug, int, 0644);
35 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
37 #define i2cdprintk(fmt, arg...) \
39 printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg); \
42 #define dprintk(fmt, arg...) \
44 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
47 /**********************************************************
48 Polling structure used by cx231xx IR's
49 **********************************************************/
51 struct cx231xx_ir_poll_result {
52 unsigned int toggle_bit:1;
53 unsigned int read_count:7;
60 struct input_dev *input;
61 struct ir_input_state ir;
65 /* poll external decoder */
67 struct work_struct work;
68 struct timer_list timer;
69 unsigned int last_toggle:1;
70 unsigned int last_readcount;
71 unsigned int repeat_interval;
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)
84 struct cx231xx_ir_poll_result poll_result;
86 /* read the registers containing the IR status */
87 result = ir->get_key(ir, &poll_result);
89 dprintk("ir->get_key() failed %d\n", result);
93 dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
94 poll_result.toggle_bit, poll_result.read_count,
95 ir->last_readcount, poll_result.rc_data[0]);
97 if (ir->dev->chip_id == CHIP_ID_EM2874) {
98 /* The em2874 clears the readcount field every time the
99 register is read. The em2860/2880 datasheet says that it
100 is supposed to clear the readcount, but it doesn't. So with
101 the em2874, we are looking for a non-zero read count as
102 opposed to a readcount that is incrementing */
103 ir->last_readcount = 0;
106 if (poll_result.read_count == 0) {
107 /* The button has not been pressed since the last read */
108 } else if (ir->last_toggle != poll_result.toggle_bit) {
109 /* A button has been pressed */
110 dprintk("button has been pressed\n");
111 ir->last_toggle = poll_result.toggle_bit;
112 ir->repeat_interval = 0;
114 } else if (poll_result.toggle_bit == ir->last_toggle &&
115 poll_result.read_count > 0 &&
116 poll_result.read_count != ir->last_readcount) {
117 /* The button is still being held down */
118 dprintk("button being held down\n");
120 /* Debouncer for first keypress */
121 if (ir->repeat_interval++ > 9) {
122 /* Start repeating after 1 second */
128 dprintk("sending keypress\n");
129 ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
130 poll_result.rc_data[0]);
131 ir_input_nokey(ir->input, &ir->ir);
134 ir->last_readcount = poll_result.read_count;
138 static void ir_timer(unsigned long data)
140 struct cx231xx_IR *ir = (struct cx231xx_IR *)data;
142 schedule_work(&ir->work);
145 static void cx231xx_ir_work(struct work_struct *work)
147 struct cx231xx_IR *ir = container_of(work, struct cx231xx_IR, work);
149 cx231xx_ir_handle_key(ir);
150 mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
153 void cx231xx_ir_start(struct cx231xx_IR *ir)
155 setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
156 INIT_WORK(&ir->work, cx231xx_ir_work);
157 schedule_work(&ir->work);
160 static void cx231xx_ir_stop(struct cx231xx_IR *ir)
162 del_timer_sync(&ir->timer);
163 flush_scheduled_work();
166 int cx231xx_ir_init(struct cx231xx *dev)
168 struct cx231xx_IR *ir;
169 struct input_dev *input_dev;
173 if (dev->board.ir_codes == NULL) {
174 /* No remote control support */
178 ir = kzalloc(sizeof(*ir), GFP_KERNEL);
179 input_dev = input_allocate_device();
180 if (!ir || !input_dev)
183 ir->input = input_dev;
185 /* Setup the proper handler based on the chip */
186 switch (dev->chip_id) {
188 printk("Unrecognized cx231xx chip id: IR not supported\n");
192 /* This is how often we ask the chip for IR information */
193 ir->polling = 100; /* ms */
195 /* init input device */
196 snprintf(ir->name, sizeof(ir->name), "cx231xx IR (%s)", dev->name);
198 usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
199 strlcat(ir->phys, "/input0", sizeof(ir->phys));
201 ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
202 input_dev->name = ir->name;
203 input_dev->phys = ir->phys;
204 input_dev->id.bustype = BUS_USB;
205 input_dev->id.version = 1;
206 input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
207 input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
209 input_dev->dev.parent = &dev->udev->dev;
210 /* record handles to ourself */
214 cx231xx_ir_start(ir);
217 err = input_register_device(ir->input);
226 input_free_device(input_dev);
231 int cx231xx_ir_fini(struct cx231xx *dev)
233 struct cx231xx_IR *ir = dev->ir;
235 /* skip detach on non attached boards */
240 input_unregister_device(ir->input);