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 34static unsigned int ir_debug; 35module_param(ir_debug, int, 0644); 36MODULE_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 54struct 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 61struct 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 80static 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 115static void ir_timer(unsigned long data) 116{ 117 struct cx231xx_IR *ir = (struct cx231xx_IR *)data; 118 119 schedule_work(&ir->work); 120} 121 122static 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 130void 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 137static void cx231xx_ir_stop(struct cx231xx_IR *ir) 138{ 139 del_timer_sync(&ir->timer); 140 flush_scheduled_work(); 141} 142 143int 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; 199err_out_stop: 200 cx231xx_ir_stop(ir); 201 dev->ir = NULL; 202err_out_free: 203 kfree(ir); 204 return err; 205} 206 207int 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} 223