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, 629 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c
new file mode 100644
index 000000000..5a4dbd39a
--- /dev/null
+++ b/drivers/input/touchscreen/bu21013_ts.c
@@ -0,0 +1,629 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define MAX_FINGERS	2
+#define RESET_DELAY	30
+#define PENUP_TIMEOUT	(10)
+#define DELTA_MIN	16
+#define MASK_BITS	0x03
+#define SHIFT_8		8
+#define SHIFT_2		2
+#define LENGTH_OF_BUFFER	11
+#define I2C_RETRY_COUNT	5
+
+#define BU21013_SENSORS_BTN_0_7_REG	0x70
+#define BU21013_SENSORS_BTN_8_15_REG	0x71
+#define BU21013_SENSORS_BTN_16_23_REG	0x72
+#define BU21013_X1_POS_MSB_REG		0x73
+#define BU21013_X1_POS_LSB_REG		0x74
+#define BU21013_Y1_POS_MSB_REG		0x75
+#define BU21013_Y1_POS_LSB_REG		0x76
+#define BU21013_X2_POS_MSB_REG		0x77
+#define BU21013_X2_POS_LSB_REG		0x78
+#define BU21013_Y2_POS_MSB_REG		0x79
+#define BU21013_Y2_POS_LSB_REG		0x7A
+#define BU21013_INT_CLR_REG		0xE8
+#define BU21013_INT_MODE_REG		0xE9
+#define BU21013_GAIN_REG		0xEA
+#define BU21013_OFFSET_MODE_REG		0xEB
+#define BU21013_XY_EDGE_REG		0xEC
+#define BU21013_RESET_REG		0xED
+#define BU21013_CALIB_REG		0xEE
+#define BU21013_DONE_REG		0xEF
+#define BU21013_SENSOR_0_7_REG		0xF0
+#define BU21013_SENSOR_8_15_REG		0xF1
+#define BU21013_SENSOR_16_23_REG	0xF2
+#define BU21013_POS_MODE1_REG		0xF3
+#define BU21013_POS_MODE2_REG		0xF4
+#define BU21013_CLK_MODE_REG		0xF5
+#define BU21013_IDLE_REG		0xFA
+#define BU21013_FILTER_REG		0xFB
+#define BU21013_TH_ON_REG		0xFC
+#define BU21013_TH_OFF_REG		0xFD
+
+
+#define BU21013_RESET_ENABLE		0x01
+
+#define BU21013_SENSORS_EN_0_7		0x3F
+#define BU21013_SENSORS_EN_8_15		0xFC
+#define BU21013_SENSORS_EN_16_23	0x1F
+
+#define BU21013_POS_MODE1_0		0x02
+#define BU21013_POS_MODE1_1		0x04
+#define BU21013_POS_MODE1_2		0x08
+
+#define BU21013_POS_MODE2_ZERO		0x01
+#define BU21013_POS_MODE2_AVG1		0x02
+#define BU21013_POS_MODE2_AVG2		0x04
+#define BU21013_POS_MODE2_EN_XY		0x08
+#define BU21013_POS_MODE2_EN_RAW	0x10
+#define BU21013_POS_MODE2_MULTI		0x80
+
+#define BU21013_CLK_MODE_DIV		0x01
+#define BU21013_CLK_MODE_EXT		0x02
+#define BU21013_CLK_MODE_CALIB		0x80
+
+#define BU21013_IDLET_0			0x01
+#define BU21013_IDLET_1			0x02
+#define BU21013_IDLET_2			0x04
+#define BU21013_IDLET_3			0x08
+#define BU21013_IDLE_INTERMIT_EN	0x10
+
+#define BU21013_DELTA_0_6	0x7F
+#define BU21013_FILTER_EN	0x80
+
+#define BU21013_INT_MODE_LEVEL	0x00
+#define BU21013_INT_MODE_EDGE	0x01
+
+#define BU21013_GAIN_0		0x01
+#define BU21013_GAIN_1		0x02
+#define BU21013_GAIN_2		0x04
+
+#define BU21013_OFFSET_MODE_DEFAULT	0x00
+#define BU21013_OFFSET_MODE_MOVE	0x01
+#define BU21013_OFFSET_MODE_DISABLE	0x02
+
+#define BU21013_TH_ON_0		0x01
+#define BU21013_TH_ON_1		0x02
+#define BU21013_TH_ON_2		0x04
+#define BU21013_TH_ON_3		0x08
+#define BU21013_TH_ON_4		0x10
+#define BU21013_TH_ON_5		0x20
+#define BU21013_TH_ON_6		0x40
+#define BU21013_TH_ON_7		0x80
+#define BU21013_TH_ON_MAX	0xFF
+
+#define BU21013_TH_OFF_0	0x01
+#define BU21013_TH_OFF_1	0x02
+#define BU21013_TH_OFF_2	0x04
+#define BU21013_TH_OFF_3	0x08
+#define BU21013_TH_OFF_4	0x10
+#define BU21013_TH_OFF_5	0x20
+#define BU21013_TH_OFF_6	0x40
+#define BU21013_TH_OFF_7	0x80
+#define BU21013_TH_OFF_MAX	0xFF
+
+#define BU21013_X_EDGE_0	0x01
+#define BU21013_X_EDGE_1	0x02
+#define BU21013_X_EDGE_2	0x04
+#define BU21013_X_EDGE_3	0x08
+#define BU21013_Y_EDGE_0	0x10
+#define BU21013_Y_EDGE_1	0x20
+#define BU21013_Y_EDGE_2	0x40
+#define BU21013_Y_EDGE_3	0x80
+
+#define BU21013_DONE	0x01
+#define BU21013_NUMBER_OF_X_SENSORS	(6)
+#define BU21013_NUMBER_OF_Y_SENSORS	(11)
+
+#define DRIVER_TP	"bu21013_tp"
+
+/**
+ * struct bu21013_ts - touch panel data structure
+ * @client: pointer to the i2c client
+ * @in_dev: pointer to the input device structure
+ * @props: the device coordinate transformation properties
+ * @regulator: pointer to the Regulator used for touch screen
+ * @cs_gpiod: chip select GPIO line
+ * @int_gpiod: touch interrupt GPIO line
+ * @touch_x_max: maximum X coordinate reported by the device
+ * @touch_y_max: maximum Y coordinate reported by the device
+ * @x_flip: indicates that the driver should invert X coordinate before
+ *	reporting
+ * @y_flip: indicates that the driver should invert Y coordinate before
+ *	reporting
+ * @touch_stopped: touch stop flag
+ *
+ * Touch panel device data structure
+ */
+struct bu21013_ts {
+	struct i2c_client *client;
+	struct input_dev *in_dev;
+	struct touchscreen_properties props;
+	struct regulator *regulator;
+	struct gpio_desc *cs_gpiod;
+	struct gpio_desc *int_gpiod;
+	u32 touch_x_max;
+	u32 touch_y_max;
+	bool x_flip;
+	bool y_flip;
+	bool touch_stopped;
+};
+
+static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf)
+{
+	int ret, i;
+
+	for (i = 0; i < I2C_RETRY_COUNT; i++) {
+		ret = i2c_smbus_read_i2c_block_data(ts->client,
+						    BU21013_SENSORS_BTN_0_7_REG,
+						    LENGTH_OF_BUFFER, buf);
+		if (ret == LENGTH_OF_BUFFER)
+			return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int bu21013_do_touch_report(struct bu21013_ts *ts)
+{
+	struct input_dev *input = ts->in_dev;
+	struct input_mt_pos pos[MAX_FINGERS];
+	int slots[MAX_FINGERS];
+	u8 buf[LENGTH_OF_BUFFER];
+	bool has_x_sensors, has_y_sensors;
+	int finger_down_count = 0;
+	int i;
+
+	if (bu21013_read_block_data(ts, buf) < 0)
+		return -EINVAL;
+
+	has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
+	has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
+		((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
+	if (!has_x_sensors || !has_y_sensors)
+		return 0;
+
+	for (i = 0; i < MAX_FINGERS; i++) {
+		const u8 *data = &buf[4 * i + 3];
+		unsigned int x, y;
+
+		x = data[0] << SHIFT_2 | (data[1] & MASK_BITS);
+		y = data[2] << SHIFT_2 | (data[3] & MASK_BITS);
+		if (x != 0 && y != 0)
+			touchscreen_set_mt_pos(&pos[finger_down_count++],
+					       &ts->props, x, y);
+	}
+
+	if (finger_down_count == 2 &&
+	    (abs(pos[0].x - pos[1].x) < DELTA_MIN ||
+	     abs(pos[0].y - pos[1].y) < DELTA_MIN)) {
+		return 0;
+	}
+
+	input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN);
+	for (i = 0; i < finger_down_count; i++) {
+		input_mt_slot(input, slots[i]);
+		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+		input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
+		input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
+	}
+
+	input_mt_sync_frame(input);
+	input_sync(input);
+
+	return 0;
+}
+
+static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
+{
+	struct bu21013_ts *ts = device_data;
+	int keep_polling;
+	int error;
+
+	do {
+		error = bu21013_do_touch_report(ts);
+		if (error) {
+			dev_err(&ts->client->dev, "%s failed\n", __func__);
+			break;
+		}
+
+		if (unlikely(ts->touch_stopped))
+			break;
+
+		keep_polling = ts->int_gpiod ?
+			gpiod_get_value(ts->int_gpiod) : false;
+		if (keep_polling)
+			usleep_range(2000, 2500);
+	} while (keep_polling);
+
+	return IRQ_HANDLED;
+}
+
+static int bu21013_init_chip(struct bu21013_ts *ts)
+{
+	struct i2c_client *client = ts->client;
+	int error;
+
+	error = i2c_smbus_write_byte_data(client, BU21013_RESET_REG,
+					  BU21013_RESET_ENABLE);
+	if (error) {
+		dev_err(&client->dev, "BU21013_RESET reg write failed\n");
+		return error;
+	}
+	msleep(RESET_DELAY);
+
+	error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_0_7_REG,
+					  BU21013_SENSORS_EN_0_7);
+	if (error) {
+		dev_err(&client->dev, "BU21013_SENSOR_0_7 reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_8_15_REG,
+					  BU21013_SENSORS_EN_8_15);
+	if (error) {
+		dev_err(&client->dev, "BU21013_SENSOR_8_15 reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_16_23_REG,
+					  BU21013_SENSORS_EN_16_23);
+	if (error) {
+		dev_err(&client->dev, "BU21013_SENSOR_16_23 reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE1_REG,
+					  BU21013_POS_MODE1_0 |
+						BU21013_POS_MODE1_1);
+	if (error) {
+		dev_err(&client->dev, "BU21013_POS_MODE1 reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE2_REG,
+					  BU21013_POS_MODE2_ZERO |
+						BU21013_POS_MODE2_AVG1 |
+						BU21013_POS_MODE2_AVG2 |
+						BU21013_POS_MODE2_EN_RAW |
+						BU21013_POS_MODE2_MULTI);
+	if (error) {
+		dev_err(&client->dev, "BU21013_POS_MODE2 reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_CLK_MODE_REG,
+					  BU21013_CLK_MODE_DIV |
+						BU21013_CLK_MODE_CALIB);
+	if (error) {
+		dev_err(&client->dev, "BU21013_CLK_MODE reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_IDLE_REG,
+					  BU21013_IDLET_0 |
+						BU21013_IDLE_INTERMIT_EN);
+	if (error) {
+		dev_err(&client->dev, "BU21013_IDLE reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_INT_MODE_REG,
+					  BU21013_INT_MODE_LEVEL);
+	if (error) {
+		dev_err(&client->dev, "BU21013_INT_MODE reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_FILTER_REG,
+					  BU21013_DELTA_0_6 |
+						BU21013_FILTER_EN);
+	if (error) {
+		dev_err(&client->dev, "BU21013_FILTER reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_TH_ON_REG,
+					  BU21013_TH_ON_5);
+	if (error) {
+		dev_err(&client->dev, "BU21013_TH_ON reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_TH_OFF_REG,
+					  BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
+	if (error) {
+		dev_err(&client->dev, "BU21013_TH_OFF reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_GAIN_REG,
+					  BU21013_GAIN_0 | BU21013_GAIN_1);
+	if (error) {
+		dev_err(&client->dev, "BU21013_GAIN reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_OFFSET_MODE_REG,
+					  BU21013_OFFSET_MODE_DEFAULT);
+	if (error) {
+		dev_err(&client->dev, "BU21013_OFFSET_MODE reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_XY_EDGE_REG,
+					  BU21013_X_EDGE_0 |
+						BU21013_X_EDGE_2 |
+						BU21013_Y_EDGE_1 |
+						BU21013_Y_EDGE_3);
+	if (error) {
+		dev_err(&client->dev, "BU21013_XY_EDGE reg write failed\n");
+		return error;
+	}
+
+	error = i2c_smbus_write_byte_data(client, BU21013_DONE_REG,
+					  BU21013_DONE);
+	if (error) {
+		dev_err(&client->dev, "BU21013_REG_DONE reg write failed\n");
+		return error;
+	}
+
+	return 0;
+}
+
+static void bu21013_power_off(void *_ts)
+{
+	struct bu21013_ts *ts = _ts;
+
+	regulator_disable(ts->regulator);
+}
+
+static void bu21013_disable_chip(void *_ts)
+{
+	struct bu21013_ts *ts = _ts;
+
+	gpiod_set_value(ts->cs_gpiod, 0);
+}
+
+static int bu21013_probe(struct i2c_client *client)
+{
+	struct bu21013_ts *ts;
+	struct input_dev *in_dev;
+	struct input_absinfo *info;
+	u32 max_x = 0, max_y = 0;
+	int error;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_err(&client->dev, "i2c smbus byte data not supported\n");
+		return -EIO;
+	}
+
+	if (!client->irq) {
+		dev_err(&client->dev, "No IRQ set up\n");
+		return -EINVAL;
+	}
+
+	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	ts->client = client;
+
+	ts->x_flip = device_property_read_bool(&client->dev, "rohm,flip-x");
+	ts->y_flip = device_property_read_bool(&client->dev, "rohm,flip-y");
+
+	in_dev = devm_input_allocate_device(&client->dev);
+	if (!in_dev) {
+		dev_err(&client->dev, "device memory alloc failed\n");
+		return -ENOMEM;
+	}
+	ts->in_dev = in_dev;
+	input_set_drvdata(in_dev, ts);
+
+	/* register the device to input subsystem */
+	in_dev->name = DRIVER_TP;
+	in_dev->id.bustype = BUS_I2C;
+
+	device_property_read_u32(&client->dev, "rohm,touch-max-x", &max_x);
+	device_property_read_u32(&client->dev, "rohm,touch-max-y", &max_y);
+
+	input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0);
+	input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
+
+	touchscreen_parse_properties(in_dev, true, &ts->props);
+
+	/* Adjust for the legacy "flip" properties, if present */
+	if (!ts->props.invert_x &&
+	    device_property_read_bool(&client->dev, "rohm,flip-x")) {
+		info = &in_dev->absinfo[ABS_MT_POSITION_X];
+		info->maximum -= info->minimum;
+		info->minimum = 0;
+	}
+
+	if (!ts->props.invert_y &&
+	    device_property_read_bool(&client->dev, "rohm,flip-y")) {
+		info = &in_dev->absinfo[ABS_MT_POSITION_Y];
+		info->maximum -= info->minimum;
+		info->minimum = 0;
+	}
+
+	error = input_mt_init_slots(in_dev, MAX_FINGERS,
+				    INPUT_MT_DIRECT | INPUT_MT_TRACK |
+					INPUT_MT_DROP_UNUSED);
+	if (error) {
+		dev_err(&client->dev, "failed to initialize MT slots");
+		return error;
+	}
+
+	ts->regulator = devm_regulator_get(&client->dev, "avdd");
+	if (IS_ERR(ts->regulator)) {
+		dev_err(&client->dev, "regulator_get failed\n");
+		return PTR_ERR(ts->regulator);
+	}
+
+	error = regulator_enable(ts->regulator);
+	if (error) {
+		dev_err(&client->dev, "regulator enable failed\n");
+		return error;
+	}
+
+	error = devm_add_action_or_reset(&client->dev, bu21013_power_off, ts);
+	if (error) {
+		dev_err(&client->dev, "failed to install power off handler\n");
+		return error;
+	}
+
+	/* Named "CS" on the chip, DT binding is "reset" */
+	ts->cs_gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
+	error = PTR_ERR_OR_ZERO(ts->cs_gpiod);
+	if (error) {
+		if (error != -EPROBE_DEFER)
+			dev_err(&client->dev, "failed to get CS GPIO\n");
+		return error;
+	}
+	gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS");
+
+	error = devm_add_action_or_reset(&client->dev,
+					 bu21013_disable_chip, ts);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to install chip disable handler\n");
+		return error;
+	}
+
+	/* Named "INT" on the chip, DT binding is "touch" */
+	ts->int_gpiod = devm_gpiod_get_optional(&client->dev,
+						"touch", GPIOD_IN);
+	error = PTR_ERR_OR_ZERO(ts->int_gpiod);
+	if (error) {
+		if (error != -EPROBE_DEFER)
+			dev_err(&client->dev, "failed to get INT GPIO\n");
+		return error;
+	}
+
+	if (ts->int_gpiod)
+		gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT");
+
+	/* configure the touch panel controller */
+	error = bu21013_init_chip(ts);
+	if (error) {
+		dev_err(&client->dev, "error in bu21013 config\n");
+		return error;
+	}
+
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, bu21013_gpio_irq,
+					  IRQF_ONESHOT, DRIVER_TP, ts);
+	if (error) {
+		dev_err(&client->dev, "request irq %d failed\n",
+			client->irq);
+		return error;
+	}
+
+	error = input_register_device(in_dev);
+	if (error) {
+		dev_err(&client->dev, "failed to register input device\n");
+		return error;
+	}
+
+	i2c_set_clientdata(client, ts);
+
+	return 0;
+}
+
+static void bu21013_remove(struct i2c_client *client)
+{
+	struct bu21013_ts *ts = i2c_get_clientdata(client);
+
+	/* Make sure IRQ will exit quickly even if there is contact */
+	ts->touch_stopped = true;
+	/* The resources will be freed by devm */
+}
+
+static int __maybe_unused bu21013_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct bu21013_ts *ts = i2c_get_clientdata(client);
+
+	ts->touch_stopped = true;
+	mb();
+	disable_irq(client->irq);
+
+	if (!device_may_wakeup(&client->dev))
+		regulator_disable(ts->regulator);
+
+	return 0;
+}
+
+static int __maybe_unused bu21013_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct bu21013_ts *ts = i2c_get_clientdata(client);
+	int error;
+
+	if (!device_may_wakeup(&client->dev)) {
+		error = regulator_enable(ts->regulator);
+		if (error) {
+			dev_err(&client->dev,
+				"failed to re-enable regulator when resuming\n");
+			return error;
+		}
+
+		error = bu21013_init_chip(ts);
+		if (error) {
+			dev_err(&client->dev,
+				"failed to reinitialize chip when resuming\n");
+			return error;
+		}
+	}
+
+	ts->touch_stopped = false;
+	mb();
+	enable_irq(client->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(bu21013_dev_pm_ops, bu21013_suspend, bu21013_resume);
+
+static const struct i2c_device_id bu21013_id[] = {
+	{ DRIVER_TP, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, bu21013_id);
+
+static struct i2c_driver bu21013_driver = {
+	.driver	= {
+		.name	=	DRIVER_TP,
+		.pm	=	&bu21013_dev_pm_ops,
+	},
+	.probe_new	=	bu21013_probe,
+	.remove		=	bu21013_remove,
+	.id_table	=	bu21013_id,
+};
+
+module_i2c_driver(bu21013_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
+MODULE_DESCRIPTION("bu21013 touch screen controller driver");