| /* |
| handle em28xx IR remotes via linux kernel input layer. |
| |
| Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it> |
| Markus Rechberger <mrechberger@gmail.com> |
| Mauro Carvalho Chehab <mchehab@infradead.org> |
| Sascha Sommer <saschasommer@freenet.de> |
| |
| 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 <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/usb.h> |
| #include <linux/slab.h> |
| |
| #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 MODULE_NAME "em28xx" |
| |
| #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 em28xx IR's |
| **********************************************************/ |
| |
| struct em28xx_ir_poll_result { |
| unsigned int toggle_bit:1; |
| unsigned int read_count:7; |
| u8 rc_address; |
| u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */ |
| }; |
| |
| struct em28xx_IR { |
| struct em28xx *dev; |
| struct rc_dev *rc; |
| char name[32]; |
| char phys[32]; |
| |
| /* poll external decoder */ |
| int polling; |
| struct delayed_work work; |
| unsigned int full_code:1; |
| unsigned int last_readcount; |
| |
| int (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *); |
| }; |
| |
| /********************************************************** |
| 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]; |
| u16 code; |
| int size; |
| |
| /* poll IR chip */ |
| size = i2c_master_recv(ir->c, buf, sizeof(buf)); |
| |
| if (size != 2) |
| return -EIO; |
| |
| /* Does eliminate repeated parity code */ |
| if (buf[1] == 0xff) |
| return 0; |
| |
| ir->old = buf[1]; |
| |
| /* |
| * Rearranges bits to the right order. |
| * The bit order were determined experimentally by using |
| * The original Hauppauge Grey IR and another RC5 that uses addr=0x08 |
| * The RC5 code has 14 bits, but we've experimentally determined |
| * the meaning for only 11 bits. |
| * So, the code translation is not complete. Yet, it is enough to |
| * work with the provided RC5 IR. |
| */ |
| code = |
| ((buf[0] & 0x01) ? 0x0020 : 0) | /* 0010 0000 */ |
| ((buf[0] & 0x02) ? 0x0010 : 0) | /* 0001 0000 */ |
| ((buf[0] & 0x04) ? 0x0008 : 0) | /* 0000 1000 */ |
| ((buf[0] & 0x08) ? 0x0004 : 0) | /* 0000 0100 */ |
| ((buf[0] & 0x10) ? 0x0002 : 0) | /* 0000 0010 */ |
| ((buf[0] & 0x20) ? 0x0001 : 0) | /* 0000 0001 */ |
| ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000 */ |
| ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000 */ |
| ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100 */ |
| ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010 */ |
| ((buf[1] & 0x80) ? 0x0100 : 0); /* 0000 0001 */ |
| |
| i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x%02x)\n", |
| code, buf[1], 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; |
| } |
| |
| int em28xx_get_key_winfast_usbii_deluxe(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw) |
| { |
| unsigned char subaddr, keydetect, key; |
| |
| struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0, .buf = &subaddr, .len = 1}, |
| |
| { .addr = ir->c->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} }; |
| |
| subaddr = 0x10; |
| if (2 != i2c_transfer(ir->c->adapter, msg, 2)) { |
| i2cdprintk("read error\n"); |
| return -EIO; |
| } |
| if (keydetect == 0x00) |
| return 0; |
| |
| subaddr = 0x00; |
| msg[1].buf = &key; |
| if (2 != i2c_transfer(ir->c->adapter, msg, 2)) { |
| i2cdprintk("read error\n"); |
| return -EIO; |
| } |
| if (key == 0x00) |
| return 0; |
| |
| *ir_key = key; |
| *ir_raw = key; |
| return 1; |
| } |
| |
| /********************************************************** |
| Poll based get keycode functions |
| **********************************************************/ |
| |
| /* This is for the em2860/em2880 */ |
| static int default_polling_getkey(struct em28xx_IR *ir, |
| struct em28xx_ir_poll_result *poll_result) |
| { |
| struct em28xx *dev = ir->dev; |
| int rc; |
| u8 msg[3] = { 0, 0, 0 }; |
| |
| /* Read key toggle, brand, and key code |
| on registers 0x45, 0x46 and 0x47 |
| */ |
| rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR, |
| msg, sizeof(msg)); |
| if (rc < 0) |
| return rc; |
| |
| /* Infrared toggle (Reg 0x45[7]) */ |
| poll_result->toggle_bit = (msg[0] >> 7); |
| |
| /* Infrared read count (Reg 0x45[6:0] */ |
| poll_result->read_count = (msg[0] & 0x7f); |
| |
| /* Remote Control Address (Reg 0x46) */ |
| poll_result->rc_address = msg[1]; |
| |
| /* Remote Control Data (Reg 0x47) */ |
| poll_result->rc_data[0] = msg[2]; |
| |
| return 0; |
| } |
| |
| static int em2874_polling_getkey(struct em28xx_IR *ir, |
| struct em28xx_ir_poll_result *poll_result) |
| { |
| struct em28xx *dev = ir->dev; |
| int rc; |
| u8 msg[5] = { 0, 0, 0, 0, 0 }; |
| |
| /* Read key toggle, brand, and key code |
| on registers 0x51-55 |
| */ |
| rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR, |
| msg, sizeof(msg)); |
| if (rc < 0) |
| return rc; |
| |
| /* Infrared toggle (Reg 0x51[7]) */ |
| poll_result->toggle_bit = (msg[0] >> 7); |
| |
| /* Infrared read count (Reg 0x51[6:0] */ |
| poll_result->read_count = (msg[0] & 0x7f); |
| |
| /* Remote Control Address (Reg 0x52) */ |
| poll_result->rc_address = msg[1]; |
| |
| /* Remote Control Data (Reg 0x53-55) */ |
| poll_result->rc_data[0] = msg[2]; |
| poll_result->rc_data[1] = msg[3]; |
| poll_result->rc_data[2] = msg[4]; |
| |
| return 0; |
| } |
| |
| /********************************************************** |
| Polling code for em28xx |
| **********************************************************/ |
| |
| static void em28xx_ir_handle_key(struct em28xx_IR *ir) |
| { |
| int result; |
| struct em28xx_ir_poll_result poll_result; |
| |
| /* read the registers containing the IR status */ |
| result = ir->get_key(ir, &poll_result); |
| if (unlikely(result < 0)) { |
| dprintk("ir->get_key() failed %d\n", result); |
| return; |
| } |
| |
| if (unlikely(poll_result.read_count != ir->last_readcount)) { |
| dprintk("%s: toggle: %d, count: %d, key 0x%02x%02x\n", __func__, |
| poll_result.toggle_bit, poll_result.read_count, |
| poll_result.rc_address, poll_result.rc_data[0]); |
| if (ir->full_code) |
| ir_keydown(ir->rc, |
| poll_result.rc_address << 8 | |
| poll_result.rc_data[0], |
| poll_result.toggle_bit); |
| else |
| ir_keydown(ir->rc, |
| poll_result.rc_data[0], |
| poll_result.toggle_bit); |
| |
| 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; |
| else |
| ir->last_readcount = poll_result.read_count; |
| } |
| } |
| |
| static void em28xx_ir_work(struct work_struct *work) |
| { |
| struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work); |
| |
| em28xx_ir_handle_key(ir); |
| schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); |
| } |
| |
| static int em28xx_ir_start(struct rc_dev *rc) |
| { |
| struct em28xx_IR *ir = rc->priv; |
| |
| INIT_DELAYED_WORK(&ir->work, em28xx_ir_work); |
| schedule_delayed_work(&ir->work, 0); |
| |
| return 0; |
| } |
| |
| static void em28xx_ir_stop(struct rc_dev *rc) |
| { |
| struct em28xx_IR *ir = rc->priv; |
| |
| cancel_delayed_work_sync(&ir->work); |
| } |
| |
| int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 ir_type) |
| { |
| int rc = 0; |
| struct em28xx_IR *ir = rc_dev->priv; |
| struct em28xx *dev = ir->dev; |
| u8 ir_config = EM2874_IR_RC5; |
| |
| /* Adjust xclk based o IR table for RC5/NEC tables */ |
| |
| if (ir_type == IR_TYPE_RC5) { |
| dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE; |
| ir->full_code = 1; |
| } else if (ir_type == IR_TYPE_NEC) { |
| dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE; |
| ir_config = EM2874_IR_NEC; |
| ir->full_code = 1; |
| } else if (ir_type != IR_TYPE_UNKNOWN) |
| rc = -EINVAL; |
| |
| em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk, |
| EM28XX_XCLK_IR_RC5_MODE); |
| |
| /* Setup the proper handler based on the chip */ |
| switch (dev->chip_id) { |
| case CHIP_ID_EM2860: |
| case CHIP_ID_EM2883: |
| ir->get_key = default_polling_getkey; |
| break; |
| case CHIP_ID_EM2874: |
| ir->get_key = em2874_polling_getkey; |
| em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1); |
| break; |
| default: |
| printk("Unrecognized em28xx chip id: IR not supported\n"); |
| rc = -EINVAL; |
| } |
| |
| return rc; |
| } |
| |
| int em28xx_ir_init(struct em28xx *dev) |
| { |
| struct em28xx_IR *ir; |
| struct rc_dev *rc; |
| int err = -ENOMEM; |
| |
| if (dev->board.ir_codes == NULL) { |
| /* No remote control support */ |
| return 0; |
| } |
| |
| ir = kzalloc(sizeof(*ir), GFP_KERNEL); |
| rc = rc_allocate_device(); |
| if (!ir || !rc) |
| goto err_out_free; |
| |
| /* record handles to ourself */ |
| ir->dev = dev; |
| dev->ir = ir; |
| ir->rc = rc; |
| |
| /* |
| * em2874 supports more protocols. For now, let's just announce |
| * the two protocols that were already tested |
| */ |
| rc->allowed_protos = IR_TYPE_RC5 | IR_TYPE_NEC; |
| rc->priv = ir; |
| rc->change_protocol = em28xx_ir_change_protocol; |
| rc->open = em28xx_ir_start; |
| rc->close = em28xx_ir_stop; |
| |
| /* By default, keep protocol field untouched */ |
| err = em28xx_ir_change_protocol(rc, IR_TYPE_UNKNOWN); |
| if (err) |
| 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), "em28xx IR (%s)", |
| dev->name); |
| |
| usb_make_path(dev->udev, ir->phys, sizeof(ir->phys)); |
| strlcat(ir->phys, "/input0", sizeof(ir->phys)); |
| |
| rc->input_name = ir->name; |
| rc->input_phys = ir->phys; |
| rc->input_id.bustype = BUS_USB; |
| rc->input_id.version = 1; |
| rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); |
| rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct); |
| rc->dev.parent = &dev->udev->dev; |
| rc->map_name = dev->board.ir_codes; |
| rc->driver_name = MODULE_NAME; |
| |
| /* all done */ |
| err = rc_register_device(rc); |
| if (err) |
| goto err_out_stop; |
| |
| return 0; |
| |
| err_out_stop: |
| dev->ir = NULL; |
| err_out_free: |
| rc_free_device(rc); |
| 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->rc); |
| rc_unregister_device(ir->rc); |
| 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; |
| } |