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path: root/drivers/media/usb/cx231xx/cx231xx-input.c
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Diffstat (limited to 'drivers/media/usb/cx231xx/cx231xx-input.c')
-rw-r--r--drivers/media/usb/cx231xx/cx231xx-input.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/media/usb/cx231xx/cx231xx-input.c b/drivers/media/usb/cx231xx/cx231xx-input.c
new file mode 100644
index 000000000..15d8d1b5f
--- /dev/null
+++ b/drivers/media/usb/cx231xx/cx231xx-input.c
@@ -0,0 +1,113 @@
+/*
+ * cx231xx IR glue driver
+ *
+ * Copyright (C) 2010 Mauro Carvalho Chehab
+ *
+ * Polaris (cx231xx) has its support for IR's with a design close to MCE.
+ * however, a few designs are using an external I2C chip for IR, instead
+ * of using the one provided by the chip.
+ * This driver provides support for those extra devices
+ *
+ * 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 version 2.
+ *
+ * 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.
+ */
+
+#include "cx231xx.h"
+#include <linux/slab.h>
+#include <linux/bitrev.h>
+
+#define MODULE_NAME "cx231xx-input"
+
+static int get_key_isdbt(struct IR_i2c *ir, enum rc_type *protocol,
+ u32 *pscancode, u8 *toggle)
+{
+ int rc;
+ u8 cmd, scancode;
+
+ dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);
+
+ /* poll IR chip */
+ rc = i2c_master_recv(ir->c, &cmd, 1);
+ if (rc < 0)
+ return rc;
+ if (rc != 1)
+ 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 */
+
+ if (cmd == 0xff)
+ return 0;
+
+ scancode = bitrev8(cmd);
+
+ dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
+ cmd, scancode);
+
+ *protocol = RC_TYPE_OTHER;
+ *pscancode = scancode;
+ *toggle = 0;
+ return 1;
+}
+
+int cx231xx_ir_init(struct cx231xx *dev)
+{
+ struct i2c_board_info info;
+ u8 ir_i2c_bus;
+
+ dev_dbg(dev->dev, "%s\n", __func__);
+
+ /* Only initialize if a rc keycode map is defined */
+ if (!cx231xx_boards[dev->model].rc_map_name)
+ return -ENODEV;
+
+ request_module("ir-kbd-i2c");
+
+ memset(&info, 0, sizeof(struct i2c_board_info));
+ memset(&dev->init_data, 0, sizeof(dev->init_data));
+ dev->init_data.rc_dev = rc_allocate_device();
+ if (!dev->init_data.rc_dev)
+ return -ENOMEM;
+
+ dev->init_data.name = cx231xx_boards[dev->model].name;
+
+ strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
+ info.platform_data = &dev->init_data;
+
+ /*
+ * Board-dependent values
+ *
+ * For now, there's just one type of hardware design using
+ * an i2c device.
+ */
+ dev->init_data.get_key = get_key_isdbt;
+ dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
+ /* The i2c micro-controller only outputs the cmd part of NEC protocol */
+ dev->init_data.rc_dev->scancode_mask = 0xff;
+ dev->init_data.rc_dev->driver_name = "cx231xx";
+ dev->init_data.type = RC_BIT_NEC;
+ info.addr = 0x30;
+
+ /* Load and bind ir-kbd-i2c */
+ ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
+ dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
+ ir_i2c_bus, info.addr);
+ dev->ir_i2c_client = i2c_new_device(
+ cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);
+
+ return 0;
+}
+
+void cx231xx_ir_exit(struct cx231xx *dev)
+{
+ if (dev->ir_i2c_client)
+ i2c_unregister_device(dev->ir_i2c_client);
+ dev->ir_i2c_client = NULL;
+}