Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 598 insertions, 0 deletions

diff --git a/drivers/media/usb/cx231xx/cx231xx-i2c.c b/drivers/media/usb/cx231xx/cx231xx-i2c.c
new file mode 100644
index 000000000..c6659253c
--- /dev/null
+++ b/drivers/media/usb/cx231xx/cx231xx-i2c.c
@@ -0,0 +1,598 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+   cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices
+
+   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
+		Based on em28xx driver
+		Based on Cx23885 driver
+
+ */
+
+#include "cx231xx.h"
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/i2c-mux.h>
+#include <media/v4l2-common.h>
+#include <media/tuner.h>
+
+
+/* ----------------------------------------------------------- */
+
+static unsigned int i2c_scan;
+module_param(i2c_scan, int, 0444);
+MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define dprintk1(lvl, fmt, args...)			\
+do {							\
+	if (i2c_debug >= lvl) {				\
+		printk(fmt, ##args);			\
+		}					\
+} while (0)
+
+#define dprintk2(lvl, fmt, args...)			\
+do {							\
+	if (i2c_debug >= lvl) {				\
+		printk(KERN_DEBUG "%s at %s: " fmt,	\
+		       dev->name, __func__ , ##args);	\
+      }							\
+} while (0)
+
+static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr)
+{
+	if (bus_nr == 1)
+		return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1;
+	return bus_nr;
+}
+
+static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
+			const struct i2c_msg *msg, int tuner_type)
+{
+	int i2c_port = get_real_i2c_port(dev, bus->nr);
+
+	if (i2c_port != dev->board.tuner_i2c_master)
+		return false;
+
+	if (msg->addr != dev->board.tuner_addr)
+		return false;
+
+	if (dev->tuner_type != tuner_type)
+		return false;
+
+	return true;
+}
+
+/*
+ * cx231xx_i2c_send_bytes()
+ */
+static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
+				  const struct i2c_msg *msg)
+{
+	struct cx231xx_i2c *bus = i2c_adap->algo_data;
+	struct cx231xx *dev = bus->dev;
+	struct cx231xx_i2c_xfer_data req_data;
+	int status = 0;
+	u16 size = 0;
+	u8 loop = 0;
+	u8 saddr_len = 1;
+	u8 *buf_ptr = NULL;
+	u16 saddr = 0;
+	u8 need_gpio = 0;
+
+	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
+		size = msg->len;
+
+		if (size == 2) {	/* register write sub addr */
+			/* Just writing sub address will cause problem
+			* to XC5000. So ignore the request */
+			return 0;
+		} else if (size == 4) {	/* register write with sub addr */
+			if (msg->len >= 2)
+				saddr = msg->buf[0] << 8 | msg->buf[1];
+			else if (msg->len == 1)
+				saddr = msg->buf[0];
+
+			switch (saddr) {
+			case 0x0000:	/* start tuner calibration mode */
+				need_gpio = 1;
+				/* FW Loading is done */
+				dev->xc_fw_load_done = 1;
+				break;
+			case 0x000D:	/* Set signal source */
+			case 0x0001:	/* Set TV standard - Video */
+			case 0x0002:	/* Set TV standard - Audio */
+			case 0x0003:	/* Set RF Frequency */
+				need_gpio = 1;
+				break;
+			default:
+				if (dev->xc_fw_load_done)
+					need_gpio = 1;
+				break;
+			}
+
+			if (need_gpio) {
+				dprintk1(1,
+				"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
+				msg->addr, msg->len, saddr);
+
+				return dev->cx231xx_gpio_i2c_write(dev,
+								   msg->addr,
+								   msg->buf,
+								   msg->len);
+			}
+		}
+
+		/* special case for Xc5000 tuner case */
+		saddr_len = 1;
+
+		/* adjust the length to correct length */
+		size -= saddr_len;
+		buf_ptr = (u8 *) (msg->buf + 1);
+
+		do {
+			/* prepare xfer_data struct */
+			req_data.dev_addr = msg->addr;
+			req_data.direction = msg->flags;
+			req_data.saddr_len = saddr_len;
+			req_data.saddr_dat = msg->buf[0];
+			req_data.buf_size = size > 16 ? 16 : size;
+			req_data.p_buffer = (u8 *) (buf_ptr + loop * 16);
+
+			bus->i2c_nostop = (size > 16) ? 1 : 0;
+			bus->i2c_reserve = (loop == 0) ? 0 : 1;
+
+			/* usb send command */
+			status = dev->cx231xx_send_usb_command(bus, &req_data);
+			loop++;
+
+			if (size >= 16)
+				size -= 16;
+			else
+				size = 0;
+
+		} while (size > 0);
+
+		bus->i2c_nostop = 0;
+		bus->i2c_reserve = 0;
+
+	} else {		/* regular case */
+
+		/* prepare xfer_data struct */
+		req_data.dev_addr = msg->addr;
+		req_data.direction = msg->flags;
+		req_data.saddr_len = 0;
+		req_data.saddr_dat = 0;
+		req_data.buf_size = msg->len;
+		req_data.p_buffer = msg->buf;
+
+		/* usb send command */
+		status = dev->cx231xx_send_usb_command(bus, &req_data);
+	}
+
+	return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_recv_bytes()
+ * read a byte from the i2c device
+ */
+static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
+				  const struct i2c_msg *msg)
+{
+	struct cx231xx_i2c *bus = i2c_adap->algo_data;
+	struct cx231xx *dev = bus->dev;
+	struct cx231xx_i2c_xfer_data req_data;
+	int status = 0;
+	u16 saddr = 0;
+	u8 need_gpio = 0;
+
+	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
+		if (msg->len == 2)
+			saddr = msg->buf[0] << 8 | msg->buf[1];
+		else if (msg->len == 1)
+			saddr = msg->buf[0];
+
+		if (dev->xc_fw_load_done) {
+
+			switch (saddr) {
+			case 0x0009:	/* BUSY check */
+				dprintk1(1,
+				"GPIO R E A D: Special case BUSY check \n");
+				/*Try read BUSY register, just set it to zero*/
+				msg->buf[0] = 0;
+				if (msg->len == 2)
+					msg->buf[1] = 0;
+				return 0;
+			case 0x0004:	/* read Lock status */
+				need_gpio = 1;
+				break;
+
+			}
+
+			if (need_gpio) {
+				/* this is a special case to handle Xceive tuner
+				clock stretch issue with gpio based I2C */
+
+				dprintk1(1,
+				"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
+				msg->addr, msg->len,
+				msg->buf[0] << 8 | msg->buf[1]);
+
+				status =
+				    dev->cx231xx_gpio_i2c_write(dev, msg->addr,
+								msg->buf,
+								msg->len);
+				status =
+				    dev->cx231xx_gpio_i2c_read(dev, msg->addr,
+							       msg->buf,
+							       msg->len);
+				return status;
+			}
+		}
+
+		/* prepare xfer_data struct */
+		req_data.dev_addr = msg->addr;
+		req_data.direction = msg->flags;
+		req_data.saddr_len = msg->len;
+		req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1];
+		req_data.buf_size = msg->len;
+		req_data.p_buffer = msg->buf;
+
+		/* usb send command */
+		status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+	} else {
+
+		/* prepare xfer_data struct */
+		req_data.dev_addr = msg->addr;
+		req_data.direction = msg->flags;
+		req_data.saddr_len = 0;
+		req_data.saddr_dat = 0;
+		req_data.buf_size = msg->len;
+		req_data.p_buffer = msg->buf;
+
+		/* usb send command */
+		status = dev->cx231xx_send_usb_command(bus, &req_data);
+	}
+
+	return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_recv_bytes_with_saddr()
+ * read a byte from the i2c device
+ */
+static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
+					     const struct i2c_msg *msg1,
+					     const struct i2c_msg *msg2)
+{
+	struct cx231xx_i2c *bus = i2c_adap->algo_data;
+	struct cx231xx *dev = bus->dev;
+	struct cx231xx_i2c_xfer_data req_data;
+	int status = 0;
+	u16 saddr = 0;
+	u8 need_gpio = 0;
+
+	if (msg1->len == 2)
+		saddr = msg1->buf[0] << 8 | msg1->buf[1];
+	else if (msg1->len == 1)
+		saddr = msg1->buf[0];
+
+	if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
+		if ((msg2->len < 16)) {
+
+			dprintk1(1,
+			"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
+			msg2->addr, msg2->len, saddr, msg1->len);
+
+			switch (saddr) {
+			case 0x0008:	/* read FW load status */
+				need_gpio = 1;
+				break;
+			case 0x0004:	/* read Lock status */
+				need_gpio = 1;
+				break;
+			}
+
+			if (need_gpio) {
+				status =
+				    dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
+								msg1->buf,
+								msg1->len);
+				status =
+				    dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
+							       msg2->buf,
+							       msg2->len);
+				return status;
+			}
+		}
+	}
+
+	/* prepare xfer_data struct */
+	req_data.dev_addr = msg2->addr;
+	req_data.direction = msg2->flags;
+	req_data.saddr_len = msg1->len;
+	req_data.saddr_dat = saddr;
+	req_data.buf_size = msg2->len;
+	req_data.p_buffer = msg2->buf;
+
+	/* usb send command */
+	status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+	return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
+					const struct i2c_msg *msg)
+{
+	struct cx231xx_i2c *bus = i2c_adap->algo_data;
+	struct cx231xx *dev = bus->dev;
+	struct cx231xx_i2c_xfer_data req_data;
+	int status = 0;
+	u8 buf[1];
+
+	/* prepare xfer_data struct */
+	req_data.dev_addr = msg->addr;
+	req_data.direction = I2C_M_RD;
+	req_data.saddr_len = 0;
+	req_data.saddr_dat = 0;
+	req_data.buf_size = 1;
+	req_data.p_buffer = buf;
+
+	/* usb send command */
+	status = dev->cx231xx_send_usb_command(bus, &req_data);
+
+	return status < 0 ? status : 0;
+}
+
+/*
+ * cx231xx_i2c_xfer()
+ * the main i2c transfer function
+ */
+static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
+			    struct i2c_msg msgs[], int num)
+{
+	struct cx231xx_i2c *bus = i2c_adap->algo_data;
+	struct cx231xx *dev = bus->dev;
+	int addr, rc, i, byte;
+
+	mutex_lock(&dev->i2c_lock);
+	for (i = 0; i < num; i++) {
+
+		addr = msgs[i].addr;
+
+		dprintk2(2, "%s %s addr=0x%x len=%d:",
+			 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+			 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
+		if (!msgs[i].len) {
+			/* no len: check only for device presence */
+			rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
+			if (rc < 0) {
+				dprintk2(2, " no device\n");
+				mutex_unlock(&dev->i2c_lock);
+				return rc;
+			}
+
+		} else if (msgs[i].flags & I2C_M_RD) {
+			/* read bytes */
+			rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
+			if (i2c_debug >= 2) {
+				for (byte = 0; byte < msgs[i].len; byte++)
+					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
+			}
+		} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
+			   msgs[i].addr == msgs[i + 1].addr
+			   && (msgs[i].len <= 2) && (bus->nr < 3)) {
+			/* write bytes */
+			if (i2c_debug >= 2) {
+				for (byte = 0; byte < msgs[i].len; byte++)
+					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
+				printk(KERN_CONT "\n");
+			}
+			/* read bytes */
+			dprintk2(2, "plus %s %s addr=0x%x len=%d:",
+				(msgs[i+1].flags & I2C_M_RD) ? "read" : "write",
+				i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len);
+			rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
+							       &msgs[i],
+							       &msgs[i + 1]);
+			if (i2c_debug >= 2) {
+				for (byte = 0; byte < msgs[i+1].len; byte++)
+					printk(KERN_CONT " %02x", msgs[i+1].buf[byte]);
+			}
+			i++;
+		} else {
+			/* write bytes */
+			if (i2c_debug >= 2) {
+				for (byte = 0; byte < msgs[i].len; byte++)
+					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
+			}
+			rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
+		}
+		if (rc < 0)
+			goto err;
+		if (i2c_debug >= 2)
+			printk(KERN_CONT "\n");
+	}
+	mutex_unlock(&dev->i2c_lock);
+	return num;
+err:
+	dprintk2(2, " ERROR: %i\n", rc);
+	mutex_unlock(&dev->i2c_lock);
+	return rc;
+}
+
+/* ----------------------------------------------------------- */
+
+/*
+ * functionality()
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
+}
+
+static const struct i2c_algorithm cx231xx_algo = {
+	.master_xfer = cx231xx_i2c_xfer,
+	.functionality = functionality,
+};
+
+static const struct i2c_adapter cx231xx_adap_template = {
+	.owner = THIS_MODULE,
+	.name = "cx231xx",
+	.algo = &cx231xx_algo,
+};
+
+/* ----------------------------------------------------------- */
+
+/*
+ * i2c_devs
+ * incomplete list of known devices
+ */
+static const char *i2c_devs[128] = {
+	[0x20 >> 1] = "demod",
+	[0x60 >> 1] = "colibri",
+	[0x88 >> 1] = "hammerhead",
+	[0x8e >> 1] = "CIR",
+	[0x32 >> 1] = "GeminiIII",
+	[0x02 >> 1] = "Aquarius",
+	[0xa0 >> 1] = "eeprom",
+	[0xc0 >> 1] = "tuner",
+	[0xc2 >> 1] = "tuner",
+};
+
+/*
+ * cx231xx_do_i2c_scan()
+ * check i2c address range for devices
+ */
+void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port)
+{
+	unsigned char buf;
+	int i, rc;
+	struct i2c_adapter *adap;
+	struct i2c_msg msg = {
+		.flags = I2C_M_RD,
+		.len = 1,
+		.buf = &buf,
+	};
+
+	if (!i2c_scan)
+		return;
+
+	/* Don't generate I2C errors during scan */
+	dev->i2c_scan_running = true;
+	adap = cx231xx_get_i2c_adap(dev, i2c_port);
+
+	for (i = 0; i < 128; i++) {
+		msg.addr = i;
+		rc = i2c_transfer(adap, &msg, 1);
+
+		if (rc < 0)
+			continue;
+		dev_info(dev->dev,
+			 "i2c scan: found device @ port %d addr 0x%x  [%s]\n",
+			 i2c_port,
+			 i << 1,
+			 i2c_devs[i] ? i2c_devs[i] : "???");
+	}
+
+	dev->i2c_scan_running = false;
+}
+
+/*
+ * cx231xx_i2c_register()
+ * register i2c bus
+ */
+int cx231xx_i2c_register(struct cx231xx_i2c *bus)
+{
+	struct cx231xx *dev = bus->dev;
+
+	if (!dev->cx231xx_send_usb_command)
+		return -EINVAL;
+
+	bus->i2c_adap = cx231xx_adap_template;
+	bus->i2c_adap.dev.parent = dev->dev;
+
+	snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr);
+
+	bus->i2c_adap.algo_data = bus;
+	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
+	bus->i2c_rc = i2c_add_adapter(&bus->i2c_adap);
+
+	if (0 != bus->i2c_rc)
+		dev_warn(dev->dev,
+			 "i2c bus %d register FAILED\n", bus->nr);
+
+	return bus->i2c_rc;
+}
+
+/*
+ * cx231xx_i2c_unregister()
+ * unregister i2c_bus
+ */
+void cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
+{
+	if (!bus->i2c_rc)
+		i2c_del_adapter(&bus->i2c_adap);
+}
+
+/*
+ * cx231xx_i2c_mux_select()
+ * switch i2c master number 1 between port1 and port3
+ */
+static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id)
+{
+	struct cx231xx *dev = i2c_mux_priv(muxc);
+
+	return cx231xx_enable_i2c_port_3(dev, chan_id);
+}
+
+int cx231xx_i2c_mux_create(struct cx231xx *dev)
+{
+	dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0,
+				  cx231xx_i2c_mux_select, NULL);
+	if (!dev->muxc)
+		return -ENOMEM;
+	dev->muxc->priv = dev;
+	return 0;
+}
+
+int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no)
+{
+	return i2c_mux_add_adapter(dev->muxc,
+				   0,
+				   mux_no /* chan_id */,
+				   0 /* class */);
+}
+
+void cx231xx_i2c_mux_unregister(struct cx231xx *dev)
+{
+	i2c_mux_del_adapters(dev->muxc);
+}
+
+struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port)
+{
+	switch (i2c_port) {
+	case I2C_0:
+		return &dev->i2c_bus[0].i2c_adap;
+	case I2C_1:
+		return &dev->i2c_bus[1].i2c_adap;
+	case I2C_2:
+		return &dev->i2c_bus[2].i2c_adap;
+	case I2C_1_MUX_1:
+		return dev->muxc->adapter[0];
+	case I2C_1_MUX_3:
+		return dev->muxc->adapter[1];
+	default:
+		BUG();
+	}
+}
+EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);