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, 820 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c
new file mode 100644
index 000000000..d092e89d4
--- /dev/null
+++ b/drivers/input/touchscreen/stmfts.c
@@ -0,0 +1,820 @@
+// SPDX-License-Identifier: GPL-2.0
+// STMicroelectronics FTS Touchscreen device driver
+//
+// Copyright (c) 2017 Samsung Electronics Co., Ltd.
+// Copyright (c) 2017 Andi Shyti <andi@etezian.org>
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+
+/* I2C commands */
+#define STMFTS_READ_INFO			0x80
+#define STMFTS_READ_STATUS			0x84
+#define STMFTS_READ_ONE_EVENT			0x85
+#define STMFTS_READ_ALL_EVENT			0x86
+#define STMFTS_LATEST_EVENT			0x87
+#define STMFTS_SLEEP_IN				0x90
+#define STMFTS_SLEEP_OUT			0x91
+#define STMFTS_MS_MT_SENSE_OFF			0x92
+#define STMFTS_MS_MT_SENSE_ON			0x93
+#define STMFTS_SS_HOVER_SENSE_OFF		0x94
+#define STMFTS_SS_HOVER_SENSE_ON		0x95
+#define STMFTS_MS_KEY_SENSE_OFF			0x9a
+#define STMFTS_MS_KEY_SENSE_ON			0x9b
+#define STMFTS_SYSTEM_RESET			0xa0
+#define STMFTS_CLEAR_EVENT_STACK		0xa1
+#define STMFTS_FULL_FORCE_CALIBRATION		0xa2
+#define STMFTS_MS_CX_TUNING			0xa3
+#define STMFTS_SS_CX_TUNING			0xa4
+
+/* events */
+#define STMFTS_EV_NO_EVENT			0x00
+#define STMFTS_EV_MULTI_TOUCH_DETECTED		0x02
+#define STMFTS_EV_MULTI_TOUCH_ENTER		0x03
+#define STMFTS_EV_MULTI_TOUCH_LEAVE		0x04
+#define STMFTS_EV_MULTI_TOUCH_MOTION		0x05
+#define STMFTS_EV_HOVER_ENTER			0x07
+#define STMFTS_EV_HOVER_LEAVE			0x08
+#define STMFTS_EV_HOVER_MOTION			0x09
+#define STMFTS_EV_KEY_STATUS			0x0e
+#define STMFTS_EV_ERROR				0x0f
+#define STMFTS_EV_CONTROLLER_READY		0x10
+#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY	0x11
+#define STMFTS_EV_STATUS			0x16
+#define STMFTS_EV_DEBUG				0xdb
+
+/* multi touch related event masks */
+#define STMFTS_MASK_EVENT_ID			0x0f
+#define STMFTS_MASK_TOUCH_ID			0xf0
+#define STMFTS_MASK_LEFT_EVENT			0x0f
+#define STMFTS_MASK_X_MSB			0x0f
+#define STMFTS_MASK_Y_LSB			0xf0
+
+/* key related event masks */
+#define STMFTS_MASK_KEY_NO_TOUCH		0x00
+#define STMFTS_MASK_KEY_MENU			0x01
+#define STMFTS_MASK_KEY_BACK			0x02
+
+#define STMFTS_EVENT_SIZE	8
+#define STMFTS_STACK_DEPTH	32
+#define STMFTS_DATA_MAX_SIZE	(STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
+#define STMFTS_MAX_FINGERS	10
+#define STMFTS_DEV_NAME		"stmfts"
+
+enum stmfts_regulators {
+	STMFTS_REGULATOR_VDD,
+	STMFTS_REGULATOR_AVDD,
+};
+
+struct stmfts_data {
+	struct i2c_client *client;
+	struct input_dev *input;
+	struct led_classdev led_cdev;
+	struct mutex mutex;
+
+	struct touchscreen_properties prop;
+
+	struct regulator_bulk_data regulators[2];
+
+	/*
+	 * Presence of ledvdd will be used also to check
+	 * whether the LED is supported.
+	 */
+	struct regulator *ledvdd;
+
+	u16 chip_id;
+	u8 chip_ver;
+	u16 fw_ver;
+	u8 config_id;
+	u8 config_ver;
+
+	u8 data[STMFTS_DATA_MAX_SIZE];
+
+	struct completion cmd_done;
+
+	bool use_key;
+	bool led_status;
+	bool hover_enabled;
+	bool running;
+};
+
+static int stmfts_brightness_set(struct led_classdev *led_cdev,
+					enum led_brightness value)
+{
+	struct stmfts_data *sdata = container_of(led_cdev,
+					struct stmfts_data, led_cdev);
+	int err;
+
+	if (value != sdata->led_status && sdata->ledvdd) {
+		if (!value) {
+			regulator_disable(sdata->ledvdd);
+		} else {
+			err = regulator_enable(sdata->ledvdd);
+			if (err) {
+				dev_warn(&sdata->client->dev,
+					 "failed to disable ledvdd regulator: %d\n",
+					 err);
+				return err;
+			}
+		}
+		sdata->led_status = value;
+	}
+
+	return 0;
+}
+
+static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
+{
+	struct stmfts_data *sdata = container_of(led_cdev,
+						struct stmfts_data, led_cdev);
+
+	return !!regulator_is_enabled(sdata->ledvdd);
+}
+
+/*
+ * We can't simply use i2c_smbus_read_i2c_block_data because we
+ * need to read more than 255 bytes (
+ */
+static int stmfts_read_events(struct stmfts_data *sdata)
+{
+	u8 cmd = STMFTS_READ_ALL_EVENT;
+	struct i2c_msg msgs[2] = {
+		{
+			.addr	= sdata->client->addr,
+			.len	= 1,
+			.buf	= &cmd,
+		},
+		{
+			.addr	= sdata->client->addr,
+			.flags	= I2C_M_RD,
+			.len	= STMFTS_DATA_MAX_SIZE,
+			.buf	= sdata->data,
+		},
+	};
+	int ret;
+
+	ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
+	if (ret < 0)
+		return ret;
+
+	return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
+}
+
+static void stmfts_report_contact_event(struct stmfts_data *sdata,
+					const u8 event[])
+{
+	u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
+	u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
+	u16 y = (event[2] >> 4) | (event[3] << 4);
+	u8 maj = event[4];
+	u8 min = event[5];
+	u8 orientation = event[6];
+	u8 area = event[7];
+
+	input_mt_slot(sdata->input, slot_id);
+
+	input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
+	input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
+	input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
+	input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
+	input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
+	input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
+	input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_report_contact_release(struct stmfts_data *sdata,
+					  const u8 event[])
+{
+	u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
+
+	input_mt_slot(sdata->input, slot_id);
+	input_mt_report_slot_inactive(sdata->input);
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_report_hover_event(struct stmfts_data *sdata,
+				      const u8 event[])
+{
+	u16 x = (event[2] << 4) | (event[4] >> 4);
+	u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
+	u8 z = event[5];
+
+	input_report_abs(sdata->input, ABS_X, x);
+	input_report_abs(sdata->input, ABS_Y, y);
+	input_report_abs(sdata->input, ABS_DISTANCE, z);
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
+{
+	switch (event[2]) {
+	case 0:
+		input_report_key(sdata->input, KEY_BACK, 0);
+		input_report_key(sdata->input, KEY_MENU, 0);
+		break;
+
+	case STMFTS_MASK_KEY_BACK:
+		input_report_key(sdata->input, KEY_BACK, 1);
+		break;
+
+	case STMFTS_MASK_KEY_MENU:
+		input_report_key(sdata->input, KEY_MENU, 1);
+		break;
+
+	default:
+		dev_warn(&sdata->client->dev,
+			 "unknown key event: %#02x\n", event[2]);
+		break;
+	}
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_parse_events(struct stmfts_data *sdata)
+{
+	int i;
+
+	for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
+		u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
+
+		switch (event[0]) {
+
+		case STMFTS_EV_CONTROLLER_READY:
+		case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
+		case STMFTS_EV_STATUS:
+			complete(&sdata->cmd_done);
+			fallthrough;
+
+		case STMFTS_EV_NO_EVENT:
+		case STMFTS_EV_DEBUG:
+			return;
+		}
+
+		switch (event[0] & STMFTS_MASK_EVENT_ID) {
+
+		case STMFTS_EV_MULTI_TOUCH_ENTER:
+		case STMFTS_EV_MULTI_TOUCH_MOTION:
+			stmfts_report_contact_event(sdata, event);
+			break;
+
+		case STMFTS_EV_MULTI_TOUCH_LEAVE:
+			stmfts_report_contact_release(sdata, event);
+			break;
+
+		case STMFTS_EV_HOVER_ENTER:
+		case STMFTS_EV_HOVER_LEAVE:
+		case STMFTS_EV_HOVER_MOTION:
+			stmfts_report_hover_event(sdata, event);
+			break;
+
+		case STMFTS_EV_KEY_STATUS:
+			stmfts_report_key_event(sdata, event);
+			break;
+
+		case STMFTS_EV_ERROR:
+			dev_warn(&sdata->client->dev,
+					"error code: 0x%x%x%x%x%x%x",
+					event[6], event[5], event[4],
+					event[3], event[2], event[1]);
+			break;
+
+		default:
+			dev_err(&sdata->client->dev,
+				"unknown event %#02x\n", event[0]);
+		}
+	}
+}
+
+static irqreturn_t stmfts_irq_handler(int irq, void *dev)
+{
+	struct stmfts_data *sdata = dev;
+	int err;
+
+	mutex_lock(&sdata->mutex);
+
+	err = stmfts_read_events(sdata);
+	if (unlikely(err))
+		dev_err(&sdata->client->dev,
+			"failed to read events: %d\n", err);
+	else
+		stmfts_parse_events(sdata);
+
+	mutex_unlock(&sdata->mutex);
+	return IRQ_HANDLED;
+}
+
+static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
+{
+	int err;
+
+	reinit_completion(&sdata->cmd_done);
+
+	err = i2c_smbus_write_byte(sdata->client, cmd);
+	if (err)
+		return err;
+
+	if (!wait_for_completion_timeout(&sdata->cmd_done,
+					 msecs_to_jiffies(1000)))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int stmfts_input_open(struct input_dev *dev)
+{
+	struct stmfts_data *sdata = input_get_drvdata(dev);
+	int err;
+
+	err = pm_runtime_resume_and_get(&sdata->client->dev);
+	if (err)
+		return err;
+
+	err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
+	if (err) {
+		pm_runtime_put_sync(&sdata->client->dev);
+		return err;
+	}
+
+	mutex_lock(&sdata->mutex);
+	sdata->running = true;
+
+	if (sdata->hover_enabled) {
+		err = i2c_smbus_write_byte(sdata->client,
+					   STMFTS_SS_HOVER_SENSE_ON);
+		if (err)
+			dev_warn(&sdata->client->dev,
+				 "failed to enable hover\n");
+	}
+	mutex_unlock(&sdata->mutex);
+
+	if (sdata->use_key) {
+		err = i2c_smbus_write_byte(sdata->client,
+					   STMFTS_MS_KEY_SENSE_ON);
+		if (err)
+			/* I can still use only the touch screen */
+			dev_warn(&sdata->client->dev,
+				 "failed to enable touchkey\n");
+	}
+
+	return 0;
+}
+
+static void stmfts_input_close(struct input_dev *dev)
+{
+	struct stmfts_data *sdata = input_get_drvdata(dev);
+	int err;
+
+	err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
+	if (err)
+		dev_warn(&sdata->client->dev,
+			 "failed to disable touchscreen: %d\n", err);
+
+	mutex_lock(&sdata->mutex);
+
+	sdata->running = false;
+
+	if (sdata->hover_enabled) {
+		err = i2c_smbus_write_byte(sdata->client,
+					   STMFTS_SS_HOVER_SENSE_OFF);
+		if (err)
+			dev_warn(&sdata->client->dev,
+				 "failed to disable hover: %d\n", err);
+	}
+	mutex_unlock(&sdata->mutex);
+
+	if (sdata->use_key) {
+		err = i2c_smbus_write_byte(sdata->client,
+					   STMFTS_MS_KEY_SENSE_OFF);
+		if (err)
+			dev_warn(&sdata->client->dev,
+				 "failed to disable touchkey: %d\n", err);
+	}
+
+	pm_runtime_put_sync(&sdata->client->dev);
+}
+
+static ssize_t stmfts_sysfs_chip_id(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%#x\n", sdata->chip_id);
+}
+
+static ssize_t stmfts_sysfs_chip_version(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", sdata->chip_ver);
+}
+
+static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", sdata->fw_ver);
+}
+
+static ssize_t stmfts_sysfs_config_id(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%#x\n", sdata->config_id);
+}
+
+static ssize_t stmfts_sysfs_config_version(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", sdata->config_ver);
+}
+
+static ssize_t stmfts_sysfs_read_status(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	u8 status[4];
+	int err;
+
+	err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
+					    sizeof(status), status);
+	if (err)
+		return err;
+
+	return sprintf(buf, "%#02x\n", status[0]);
+}
+
+static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", sdata->hover_enabled);
+}
+
+static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t len)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	unsigned long value;
+	int err = 0;
+
+	if (kstrtoul(buf, 0, &value))
+		return -EINVAL;
+
+	mutex_lock(&sdata->mutex);
+
+	if (value && sdata->hover_enabled)
+		goto out;
+
+	if (sdata->running)
+		err = i2c_smbus_write_byte(sdata->client,
+					   value ? STMFTS_SS_HOVER_SENSE_ON :
+						   STMFTS_SS_HOVER_SENSE_OFF);
+
+	if (!err)
+		sdata->hover_enabled = !!value;
+
+out:
+	mutex_unlock(&sdata->mutex);
+
+	return len;
+}
+
+static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
+static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
+static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
+static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
+static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
+static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
+static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
+					stmfts_sysfs_hover_enable_write);
+
+static struct attribute *stmfts_sysfs_attrs[] = {
+	&dev_attr_chip_id.attr,
+	&dev_attr_chip_version.attr,
+	&dev_attr_fw_ver.attr,
+	&dev_attr_config_id.attr,
+	&dev_attr_config_version.attr,
+	&dev_attr_status.attr,
+	&dev_attr_hover_enable.attr,
+	NULL
+};
+
+static struct attribute_group stmfts_attribute_group = {
+	.attrs = stmfts_sysfs_attrs
+};
+
+static int stmfts_power_on(struct stmfts_data *sdata)
+{
+	int err;
+	u8 reg[8];
+
+	err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
+				    sdata->regulators);
+	if (err)
+		return err;
+
+	/*
+	 * The datasheet does not specify the power on time, but considering
+	 * that the reset time is < 10ms, I sleep 20ms to be sure
+	 */
+	msleep(20);
+
+	err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
+					    sizeof(reg), reg);
+	if (err < 0)
+		return err;
+	if (err != sizeof(reg))
+		return -EIO;
+
+	sdata->chip_id = be16_to_cpup((__be16 *)&reg[6]);
+	sdata->chip_ver = reg[0];
+	sdata->fw_ver = be16_to_cpup((__be16 *)&reg[2]);
+	sdata->config_id = reg[4];
+	sdata->config_ver = reg[5];
+
+	enable_irq(sdata->client->irq);
+
+	msleep(50);
+
+	err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
+	if (err)
+		return err;
+
+	err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
+	if (err)
+		return err;
+
+	/* optional tuning */
+	err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
+	if (err)
+		dev_warn(&sdata->client->dev,
+			 "failed to perform mutual auto tune: %d\n", err);
+
+	/* optional tuning */
+	err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
+	if (err)
+		dev_warn(&sdata->client->dev,
+			 "failed to perform self auto tune: %d\n", err);
+
+	err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
+	if (err)
+		return err;
+
+	/*
+	 * At this point no one is using the touchscreen
+	 * and I don't really care about the return value
+	 */
+	(void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
+
+	return 0;
+}
+
+static void stmfts_power_off(void *data)
+{
+	struct stmfts_data *sdata = data;
+
+	disable_irq(sdata->client->irq);
+	regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
+						sdata->regulators);
+}
+
+/* This function is void because I don't want to prevent using the touch key
+ * only because the LEDs don't get registered
+ */
+static int stmfts_enable_led(struct stmfts_data *sdata)
+{
+	int err;
+
+	/* get the regulator for powering the leds on */
+	sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
+	if (IS_ERR(sdata->ledvdd))
+		return PTR_ERR(sdata->ledvdd);
+
+	sdata->led_cdev.name = STMFTS_DEV_NAME;
+	sdata->led_cdev.max_brightness = LED_ON;
+	sdata->led_cdev.brightness = LED_OFF;
+	sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set;
+	sdata->led_cdev.brightness_get = stmfts_brightness_get;
+
+	err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
+	if (err) {
+		devm_regulator_put(sdata->ledvdd);
+		return err;
+	}
+
+	return 0;
+}
+
+static int stmfts_probe(struct i2c_client *client)
+{
+	int err;
+	struct stmfts_data *sdata;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
+						I2C_FUNC_SMBUS_BYTE_DATA |
+						I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -ENODEV;
+
+	sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
+	if (!sdata)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, sdata);
+
+	sdata->client = client;
+	mutex_init(&sdata->mutex);
+	init_completion(&sdata->cmd_done);
+
+	sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
+	sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
+	err = devm_regulator_bulk_get(&client->dev,
+				      ARRAY_SIZE(sdata->regulators),
+				      sdata->regulators);
+	if (err)
+		return err;
+
+	sdata->input = devm_input_allocate_device(&client->dev);
+	if (!sdata->input)
+		return -ENOMEM;
+
+	sdata->input->name = STMFTS_DEV_NAME;
+	sdata->input->id.bustype = BUS_I2C;
+	sdata->input->open = stmfts_input_open;
+	sdata->input->close = stmfts_input_close;
+
+	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
+	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
+	touchscreen_parse_properties(sdata->input, true, &sdata->prop);
+
+	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
+
+	sdata->use_key = device_property_read_bool(&client->dev,
+						   "touch-key-connected");
+	if (sdata->use_key) {
+		input_set_capability(sdata->input, EV_KEY, KEY_MENU);
+		input_set_capability(sdata->input, EV_KEY, KEY_BACK);
+	}
+
+	err = input_mt_init_slots(sdata->input,
+				  STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
+	if (err)
+		return err;
+
+	input_set_drvdata(sdata->input, sdata);
+
+	/*
+	 * stmfts_power_on expects interrupt to be disabled, but
+	 * at this point the device is still off and I do not trust
+	 * the status of the irq line that can generate some spurious
+	 * interrupts. To be on the safe side it's better to not enable
+	 * the interrupts during their request.
+	 */
+	err = devm_request_threaded_irq(&client->dev, client->irq,
+					NULL, stmfts_irq_handler,
+					IRQF_ONESHOT | IRQF_NO_AUTOEN,
+					"stmfts_irq", sdata);
+	if (err)
+		return err;
+
+	dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
+
+	err = stmfts_power_on(sdata);
+	if (err)
+		return err;
+
+	err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
+	if (err)
+		return err;
+
+	err = input_register_device(sdata->input);
+	if (err)
+		return err;
+
+	if (sdata->use_key) {
+		err = stmfts_enable_led(sdata);
+		if (err) {
+			/*
+			 * Even if the LEDs have failed to be initialized and
+			 * used in the driver, I can still use the device even
+			 * without LEDs. The ledvdd regulator pointer will be
+			 * used as a flag.
+			 */
+			dev_warn(&client->dev, "unable to use touchkey leds\n");
+			sdata->ledvdd = NULL;
+		}
+	}
+
+	err = devm_device_add_group(&client->dev, &stmfts_attribute_group);
+	if (err)
+		return err;
+
+	pm_runtime_enable(&client->dev);
+	device_enable_async_suspend(&client->dev);
+
+	return 0;
+}
+
+static void stmfts_remove(struct i2c_client *client)
+{
+	pm_runtime_disable(&client->dev);
+}
+
+static int __maybe_unused stmfts_runtime_suspend(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	int ret;
+
+	ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
+	if (ret)
+		dev_warn(dev, "failed to suspend device: %d\n", ret);
+
+	return ret;
+}
+
+static int __maybe_unused stmfts_runtime_resume(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	int ret;
+
+	ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
+	if (ret)
+		dev_err(dev, "failed to resume device: %d\n", ret);
+
+	return ret;
+}
+
+static int __maybe_unused stmfts_suspend(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	stmfts_power_off(sdata);
+
+	return 0;
+}
+
+static int __maybe_unused stmfts_resume(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return stmfts_power_on(sdata);
+}
+
+static const struct dev_pm_ops stmfts_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
+	SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id stmfts_of_match[] = {
+	{ .compatible = "st,stmfts", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, stmfts_of_match);
+#endif
+
+static const struct i2c_device_id stmfts_id[] = {
+	{ "stmfts", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, stmfts_id);
+
+static struct i2c_driver stmfts_driver = {
+	.driver = {
+		.name = STMFTS_DEV_NAME,
+		.of_match_table = of_match_ptr(stmfts_of_match),
+		.pm = &stmfts_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+	.probe_new = stmfts_probe,
+	.remove = stmfts_remove,
+	.id_table = stmfts_id,
+};
+
+module_i2c_driver(stmfts_driver);
+
+MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
+MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
+MODULE_LICENSE("GPL v2");