/* handle em28xx IR remotes via linux kernel input layer. Copyright (C) 2005 Ludovico Cavedon Markus Rechberger Mauro Carvalho Chehab Sascha Sommer 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 "em28xx.h" #define EM28XX_SNAPSHOT_KEY KEY_CAMERA #define EM28XX_SBUTTON_QUERY_INTERVAL 500 #define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20 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->c.name , ## arg); \ } #define dprintk(fmt, arg...) \ if (ir_debug) { \ printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \ } /********************************************************** Polling structure used by em28xx IR's **********************************************************/ struct em28xx_IR { struct em28xx *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; u32 last_gpio; u32 mask_keycode; u32 mask_keydown; u32 mask_keyup; int (*get_key)(struct em28xx_IR *); }; /********************************************************** I2C IR based get keycodes - should be used with ir-kbd-i2c **********************************************************/ int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw) { unsigned char b; /* poll IR chip */ if (1 != i2c_master_recv(&ir->c, &b, 1)) { i2cdprintk("read error\n"); return -EIO; } /* it seems that 0xFE indicates that a button is still hold down, while 0xff indicates that no button is hold down. 0xfe sequences are sometimes interrupted by 0xFF */ i2cdprintk("key %02x\n", b); if (b == 0xff) return 0; if (b == 0xfe) /* keep old data */ return 1; *ir_key = b; *ir_raw = b; return 1; } int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw) { unsigned char buf[2]; unsigned char code; /* poll IR chip */ if (2 != i2c_master_recv(&ir->c, buf, 2)) return -EIO; /* Does eliminate repeated parity code */ if (buf[1] == 0xff) return 0; ir->old = buf[1]; /* Rearranges bits to the right order */ code = ((buf[0]&0x01)<<5) | /* 0010 0000 */ ((buf[0]&0x02)<<3) | /* 0001 0000 */ ((buf[0]&0x04)<<1) | /* 0000 1000 */ ((buf[0]&0x08)>>1) | /* 0000 0100 */ ((buf[0]&0x10)>>3) | /* 0000 0010 */ ((buf[0]&0x20)>>5); /* 0000 0001 */ i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n", code, buf[0]); /* return key */ *ir_key = code; *ir_raw = code; return 1; } int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw) { unsigned char buf[3]; /* poll IR chip */ if (3 != i2c_master_recv(&ir->c, buf, 3)) { i2cdprintk("read error\n"); return -EIO; } i2cdprintk("key %02x\n", buf[2]&0x3f); if (buf[0] != 0x00) return 0; *ir_key = buf[2]&0x3f; *ir_raw = buf[2]&0x3f; return 1; } /********************************************************** Poll based get keycode functions **********************************************************/ static int default_polling_getkey(struct em28xx_IR *ir) { struct em28xx *dev = ir->dev; int rc; u32 msg; /* Read key toggle, brand, and key code */ rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR, (u8 *)&msg, sizeof(msg)); if (rc < 0) return rc; return (int)(msg & 0x7fffffffl); } /********************************************************** Polling code for em28xx **********************************************************/ static void em28xx_ir_handle_key(struct em28xx_IR *ir) { int gpio; u32 data; /* read gpio value */ gpio = ir->get_key(ir); if (gpio < 0) return; if (gpio == ir->last_gpio) return; ir->last_gpio = gpio; /* extract data */ data = ir_extract_bits(gpio, ir->mask_keycode); dprintk("irq gpio=0x%x code=%d | poll%s%s\n", gpio, data, (gpio & ir->mask_keydown) ? " down" : "", (gpio & ir->mask_keyup) ? " up" : ""); /* Generate keyup/keydown events */ if (ir->mask_keydown) { /* bit set on keydown */ if (gpio & ir->mask_keydown) ir_input_keydown(ir->input, &ir->ir, data, data); else ir_input_nokey(ir->input, &ir->ir); } else if (ir->mask_keyup) { /* bit cleared on keydown */ if (!(gpio & ir->mask_keyup)) ir_input_keydown(ir->input, &ir->ir, data, data); else ir_input_nokey(ir->input, &ir->ir); } else { /* can't distinguish keydown/up :-/ */ ir_input_keydown(ir->input, &ir->ir, data, data); ir_input_nokey(ir->input, &ir->ir); } } static void ir_timer(unsigned long data) { struct em28xx_IR *ir = (struct em28xx_IR *)data; schedule_work(&ir->work); } static void em28xx_ir_work(struct work_struct *work) { struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work); em28xx_ir_handle_key(ir); mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling)); } void em28xx_ir_start(struct em28xx_IR *ir) { setup_timer(&ir->timer, ir_timer, (unsigned long)ir); INIT_WORK(&ir->work, em28xx_ir_work); schedule_work(&ir->work); } static void em28xx_ir_stop(struct em28xx_IR *ir) { del_timer_sync(&ir->timer); flush_scheduled_work(); } int em28xx_ir_init(struct em28xx *dev) { struct em28xx_IR *ir; struct input_dev *input_dev; IR_KEYTAB_TYPE *ir_codes = NULL; int ir_type = IR_TYPE_OTHER; int err = -ENOMEM; ir = kzalloc(sizeof(*ir), GFP_KERNEL); input_dev = input_allocate_device(); if (!ir || !input_dev) goto err_out_free; ir->input = input_dev; /* */ ir->get_key = default_polling_getkey; ir->polling = 50; /* ms */ /* detect & configure */ switch (dev->model) { } if (NULL == ir_codes) { err = -ENODEV; goto err_out_free; } /* Get the current key status, to avoid adding an unexistent key code */ ir->last_gpio = ir->get_key(ir); /* init input device */ snprintf(ir->name, sizeof(ir->name), "em28xx 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, 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; em28xx_ir_start(ir); /* all done */ err = input_register_device(ir->input); if (err) goto err_out_stop; return 0; err_out_stop: em28xx_ir_stop(ir); dev->ir = NULL; err_out_free: input_free_device(input_dev); kfree(ir); return err; } int em28xx_ir_fini(struct em28xx *dev) { struct em28xx_IR *ir = dev->ir; /* skip detach on non attached boards */ if (!ir) return 0; em28xx_ir_stop(ir); input_unregister_device(ir->input); kfree(ir); /* done */ dev->ir = NULL; return 0; } /********************************************************** Handle Webcam snapshot button **********************************************************/ static void em28xx_query_sbutton(struct work_struct *work) { /* Poll the register and see if the button is depressed */ struct em28xx *dev = container_of(work, struct em28xx, sbutton_query_work.work); int ret; ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP); if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) { u8 cleared; /* Button is depressed, clear the register */ cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT; em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1); /* Not emulate the keypress */ input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY, 1); /* Now unpress the key */ input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY, 0); } /* Schedule next poll */ schedule_delayed_work(&dev->sbutton_query_work, msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL)); } void em28xx_register_snapshot_button(struct em28xx *dev) { struct input_dev *input_dev; int err; em28xx_info("Registering snapshot button...\n"); input_dev = input_allocate_device(); if (!input_dev) { em28xx_errdev("input_allocate_device failed\n"); return; } usb_make_path(dev->udev, dev->snapshot_button_path, sizeof(dev->snapshot_button_path)); strlcat(dev->snapshot_button_path, "/sbutton", sizeof(dev->snapshot_button_path)); INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton); input_dev->name = "em28xx snapshot button"; input_dev->phys = dev->snapshot_button_path; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit); input_dev->keycodesize = 0; input_dev->keycodemax = 0; input_dev->id.bustype = BUS_USB; input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct); input_dev->id.version = 1; input_dev->dev.parent = &dev->udev->dev; err = input_register_device(input_dev); if (err) { em28xx_errdev("input_register_device failed\n"); input_free_device(input_dev); return; } dev->sbutton_input_dev = input_dev; schedule_delayed_work(&dev->sbutton_query_work, msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL)); return; } void em28xx_deregister_snapshot_button(struct em28xx *dev) { if (dev->sbutton_input_dev != NULL) { em28xx_info("Deregistering snapshot button\n"); cancel_rearming_delayed_work(&dev->sbutton_query_work); input_unregister_device(dev->sbutton_input_dev); dev->sbutton_input_dev = NULL; } return; }