[ARM] tegra: hdmi nvhdcp driver

Device /dev/nvhdcpX is used to manage NVHDCP on framebuffer /dev/fbX.
These devices are created on hdmi driver initialition when it is
attached to dc. Currently only one nvhdcp device may be created. An ioctl
interface is in video/nvhdcp.h

Check for repeaters and store repeater info. userspace application
queries this status to authenticate the connection. When authentication
fails, auto-renegotiate every 1.75 seconds. Give up after 5 failed attempts,
reset after hotplug or policy change.

use TEGRA_DC_OUT_NVHDCP_POLICY_ON_DEMAND in tegra_dc_out.flags in board
panel configuration to select a different default policy at probe. Currently
only TEGRA_DC_OUT_NVHDCP_POLICY_ALWAYS_ON is supported.

Change-Id: I0db66fc86096b98d2604544061721d291523de75
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
Tested-by: Jon Mayo <jmayo@nvidia.com>
Reviewed-by: Phillip Smith <psmith@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Signed-off-by: Erik Gilling <konkers@android.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/include/video/nvhdcp.h b/include/video/nvhdcp.h
new file mode 100644
index 000000000000..f282ff8caa99
--- /dev/null
+++ b/include/video/nvhdcp.h
@@ -0,0 +1,91 @@
+/*
+ * include/video/nvhdcp.h
+ *
+ * Copyright (c) 2010-2011, NVIDIA Corporation.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _LINUX_NVHDCP_H_
+#define _LINUX_NVHDCP_H_
+
+#include <linux/fb.h>
+#include <linux/types.h>
+#include <asm/ioctl.h>
+
+/* maximum receivers and repeaters connected at a time */
+#define TEGRA_NVHDCP_MAX_DEVS	127
+
+/* values for value_flags */
+#define TEGRA_NVHDCP_FLAG_AN			0x0001
+#define TEGRA_NVHDCP_FLAG_AKSV			0x0002
+#define TEGRA_NVHDCP_FLAG_BKSV			0x0004
+#define TEGRA_NVHDCP_FLAG_BSTATUS		0x0008 /* repeater status */
+#define TEGRA_NVHDCP_FLAG_CN			0x0010 /* c_n */
+#define TEGRA_NVHDCP_FLAG_CKSV			0x0020 /* c_ksv */
+#define TEGRA_NVHDCP_FLAG_DKSV			0x0040 /* d_ksv */
+#define TEGRA_NVHDCP_FLAG_KP			0x0080 /* k_prime */
+#define TEGRA_NVHDCP_FLAG_S			0x0100 /* hdcp_status */
+#define TEGRA_NVHDCP_FLAG_CS			0x0200 /* connection state */
+#define TEGRA_NVHDCP_FLAG_V			0x0400
+#define TEGRA_NVHDCP_FLAG_MP			0x0800
+#define TEGRA_NVHDCP_FLAG_BKSVLIST		0x1000
+
+/* values for packet_results */
+#define TEGRA_NVHDCP_RESULT_SUCCESS		0
+#define TEGRA_NVHDCP_RESULT_UNSUCCESSFUL	1
+#define TEGRA_NVHDCP_RESULT_PENDING		0x103
+#define TEGRA_NVHDCP_RESULT_LINK_FAILED		0xc0000013
+/* TODO: replace with -EINVAL */
+#define TEGRA_NVHDCP_RESULT_INVALID_PARAMETER	0xc000000d
+#define TEGRA_NVHDCP_RESULT_INVALID_PARAMETER_MIX	0xc0000030
+/* TODO: replace with -ENOMEM */
+#define TEGRA_NVHDCP_RESULT_NO_MEMORY		0xc0000017
+
+struct tegra_nvhdcp_packet {
+	__u32	value_flags;		// (IN/OUT)
+	__u32	packet_results;		// (OUT)
+
+	__u64	c_n;			// (IN) upstream exchange number
+	__u64	c_ksv;			// (IN)
+
+	__u32	b_status;	// (OUT) link/repeater status
+	__u64	hdcp_status;	// (OUT) READ_S
+	__u64	cs;		// (OUT) Connection State
+
+	__u64	k_prime;	// (OUT)
+	__u64	a_n;		// (OUT)
+	__u64	a_ksv;		// (OUT)
+	__u64	b_ksv;		// (OUT)
+	__u64	d_ksv;		// (OUT)
+	__u8	v_prime[20];	// (OUT) 160-bit
+	__u64	m_prime;	// (OUT)
+
+	// (OUT) Valid KSVs in the bKsvList. Maximum is 127 devices
+	__u32	num_bksv_list;
+
+	// (OUT) Up to 127 receivers & repeaters
+	__u64	bksv_list[TEGRA_NVHDCP_MAX_DEVS];
+};
+
+/* parameters to TEGRAIO_NVHDCP_SET_POLICY */
+#define TEGRA_NVHDCP_POLICY_ON_DEMAND	0
+#define TEGRA_NVHDCP_POLICY_ALWAYS_ON	1
+
+/* ioctls */
+#define TEGRAIO_NVHDCP_ON		_IO('F', 0x70)
+#define TEGRAIO_NVHDCP_OFF		_IO('F', 0x71)
+#define TEGRAIO_NVHDCP_SET_POLICY	_IOW('F', 0x72, __u32)
+#define TEGRAIO_NVHDCP_READ_M		_IOWR('F', 0x73, struct tegra_nvhdcp_packet)
+#define TEGRAIO_NVHDCP_READ_S		_IOWR('F', 0x74, struct tegra_nvhdcp_packet)
+#define TEGRAIO_NVHDCP_RENEGOTIATE	_IO('F', 0x75)
+
+#endif