1 files changed, 560 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-input.c b/drivers/media/video/em28xx/em28xx-input.c
new file mode 100644
index 00000000000..5d12b14282e
--- /dev/null
+++ b/drivers/media/video/em28xx/em28xx-input.c
@@ -0,0 +1,560 @@
+/*
+  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)
+                        rc_keydown(ir->rc,
+                                   poll_result.rc_address << 8 |
+                                   poll_result.rc_data[0],
+                                   poll_result.toggle_bit);
+                else
+                        rc_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 rc_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 (rc_type == RC_TYPE_RC5) {
+                dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
+                ir->full_code = 1;
+        } else if (rc_type == RC_TYPE_NEC) {
+                dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
+                ir_config = EM2874_IR_NEC;
+                ir->full_code = 1;
+        } else if (rc_type != RC_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:
+        case CHIP_ID_EM28174:
+                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 = RC_TYPE_RC5 | RC_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, RC_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_delayed_work_sync(&dev->sbutton_query_work);
+                input_unregister_device(dev->sbutton_input_dev);
+                dev->sbutton_input_dev = NULL;
+        }
+        return;
+}