/* handle cx231xx IR remotes via linux kernel input layer. Copyright (C) 2008 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 #include #include #include #include #include #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->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; }