From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- drivers/input/touchscreen/bu21029_ts.c | 483 +++++++++++++++++++++++++++++++++ 1 file changed, 483 insertions(+) create mode 100644 drivers/input/touchscreen/bu21029_ts.c (limited to 'drivers/input/touchscreen/bu21029_ts.c') diff --git a/drivers/input/touchscreen/bu21029_ts.c b/drivers/input/touchscreen/bu21029_ts.c new file mode 100644 index 000000000..215f4dc51 --- /dev/null +++ b/drivers/input/touchscreen/bu21029_ts.c @@ -0,0 +1,483 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Rohm BU21029 touchscreen controller driver + * + * Copyright (C) 2015-2018 Bosch Sicherheitssysteme GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * HW_ID1 Register (PAGE=0, ADDR=0x0E, Reset value=0x02, Read only) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | HW_IDH | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * HW_ID2 Register (PAGE=0, ADDR=0x0F, Reset value=0x29, Read only) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | HW_IDL | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * HW_IDH: high 8bits of IC's ID + * HW_IDL: low 8bits of IC's ID + */ +#define BU21029_HWID_REG (0x0E << 3) +#define SUPPORTED_HWID 0x0229 + +/* + * CFR0 Register (PAGE=0, ADDR=0x00, Reset value=0x20) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | 0 | 0 | CALIB | INTRM | 0 | 0 | 0 | 0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * CALIB: 0 = not to use calibration result (*) + * 1 = use calibration result + * INTRM: 0 = INT output depend on "pen down" (*) + * 1 = INT output always "0" + */ +#define BU21029_CFR0_REG (0x00 << 3) +#define CFR0_VALUE 0x00 + +/* + * CFR1 Register (PAGE=0, ADDR=0x01, Reset value=0xA6) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | MAV | AVE[2:0] | 0 | SMPL[2:0] | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * MAV: 0 = median average filter off + * 1 = median average filter on (*) + * AVE: AVE+1 = number of average samples for MAV, + * if AVE>SMPL, then AVE=SMPL (=3) + * SMPL: SMPL+1 = number of conversion samples for MAV (=7) + */ +#define BU21029_CFR1_REG (0x01 << 3) +#define CFR1_VALUE 0xA6 + +/* + * CFR2 Register (PAGE=0, ADDR=0x02, Reset value=0x04) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | INTVL_TIME[3:0] | TIME_ST_ADC[3:0] | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * INTVL_TIME: waiting time between completion of conversion + * and start of next conversion, only usable in + * autoscan mode (=20.480ms) + * TIME_ST_ADC: waiting time between application of voltage + * to panel and start of A/D conversion (=100us) + */ +#define BU21029_CFR2_REG (0x02 << 3) +#define CFR2_VALUE 0xC9 + +/* + * CFR3 Register (PAGE=0, ADDR=0x0B, Reset value=0x72) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | RM8 | STRETCH| PU90K | DUAL | PIDAC_OFS[3:0] | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * RM8: 0 = coordinate resolution is 12bit (*) + * 1 = coordinate resolution is 8bit + * STRETCH: 0 = SCL_STRETCH function off + * 1 = SCL_STRETCH function on (*) + * PU90K: 0 = internal pull-up resistance for touch detection is ~50kohms (*) + * 1 = internal pull-up resistance for touch detection is ~90kohms + * DUAL: 0 = dual touch detection off (*) + * 1 = dual touch detection on + * PIDAC_OFS: dual touch detection circuit adjustment, it is not necessary + * to change this from initial value + */ +#define BU21029_CFR3_REG (0x0B << 3) +#define CFR3_VALUE 0x42 + +/* + * LDO Register (PAGE=0, ADDR=0x0C, Reset value=0x00) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | 0 | PVDD[2:0] | 0 | AVDD[2:0] | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * PVDD: output voltage of panel output regulator (=2.000V) + * AVDD: output voltage of analog circuit regulator (=2.000V) + */ +#define BU21029_LDO_REG (0x0C << 3) +#define LDO_VALUE 0x77 + +/* + * Serial Interface Command Byte 1 (CID=1) + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * | 1 | CF | CMSK | PDM | STP | + * +--------+--------+--------+--------+--------+--------+--------+--------+ + * CF: conversion function, see table 3 in datasheet p6 (=0000, automatic scan) + * CMSK: 0 = executes convert function (*) + * 1 = reads the convert result + * PDM: 0 = power down after convert function stops (*) + * 1 = keep power on after convert function stops + * STP: 1 = abort current conversion and power down, set to "0" automatically + */ +#define BU21029_AUTOSCAN 0x80 + +/* + * The timeout value needs to be larger than INTVL_TIME + tConv4 (sample and + * conversion time), where tConv4 is calculated by formula: + * tPON + tDLY1 + (tTIME_ST_ADC + (tADC * tSMPL) * 2 + tDLY2) * 3 + * see figure 8 in datasheet p15 for details of each field. + */ +#define PEN_UP_TIMEOUT_MS 50 + +#define STOP_DELAY_MIN_US 50 +#define STOP_DELAY_MAX_US 1000 +#define START_DELAY_MS 2 +#define BUF_LEN 8 +#define SCALE_12BIT (1 << 12) +#define MAX_12BIT ((1 << 12) - 1) +#define DRIVER_NAME "bu21029" + +struct bu21029_ts_data { + struct i2c_client *client; + struct input_dev *in_dev; + struct timer_list timer; + struct regulator *vdd; + struct gpio_desc *reset_gpios; + u32 x_plate_ohms; + struct touchscreen_properties prop; +}; + +static void bu21029_touch_report(struct bu21029_ts_data *bu21029, const u8 *buf) +{ + u16 x, y, z1, z2; + u32 rz; + s32 max_pressure = input_abs_get_max(bu21029->in_dev, ABS_PRESSURE); + + /* + * compose upper 8 and lower 4 bits into a 12bit value: + * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ + * | ByteH | ByteL | + * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ + * |b07|b06|b05|b04|b03|b02|b01|b00|b07|b06|b05|b04|b03|b02|b01|b00| + * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ + * |v11|v10|v09|v08|v07|v06|v05|v04|v03|v02|v01|v00| 0 | 0 | 0 | 0 | + * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ + */ + x = (buf[0] << 4) | (buf[1] >> 4); + y = (buf[2] << 4) | (buf[3] >> 4); + z1 = (buf[4] << 4) | (buf[5] >> 4); + z2 = (buf[6] << 4) | (buf[7] >> 4); + + if (z1 && z2) { + /* + * calculate Rz (pressure resistance value) by equation: + * Rz = Rx * (x/Q) * ((z2/z1) - 1), where + * Rx is x-plate resistance, + * Q is the touch screen resolution (8bit = 256, 12bit = 4096) + * x, z1, z2 are the measured positions. + */ + rz = z2 - z1; + rz *= x; + rz *= bu21029->x_plate_ohms; + rz /= z1; + rz = DIV_ROUND_CLOSEST(rz, SCALE_12BIT); + if (rz <= max_pressure) { + touchscreen_report_pos(bu21029->in_dev, &bu21029->prop, + x, y, false); + input_report_abs(bu21029->in_dev, ABS_PRESSURE, + max_pressure - rz); + input_report_key(bu21029->in_dev, BTN_TOUCH, 1); + input_sync(bu21029->in_dev); + } + } +} + +static void bu21029_touch_release(struct timer_list *t) +{ + struct bu21029_ts_data *bu21029 = from_timer(bu21029, t, timer); + + input_report_abs(bu21029->in_dev, ABS_PRESSURE, 0); + input_report_key(bu21029->in_dev, BTN_TOUCH, 0); + input_sync(bu21029->in_dev); +} + +static irqreturn_t bu21029_touch_soft_irq(int irq, void *data) +{ + struct bu21029_ts_data *bu21029 = data; + u8 buf[BUF_LEN]; + int error; + + /* + * Read touch data and deassert interrupt (will assert again after + * INTVL_TIME + tConv4 for continuous touch) + */ + error = i2c_smbus_read_i2c_block_data(bu21029->client, BU21029_AUTOSCAN, + sizeof(buf), buf); + if (error < 0) + goto out; + + bu21029_touch_report(bu21029, buf); + + /* reset timer for pen up detection */ + mod_timer(&bu21029->timer, + jiffies + msecs_to_jiffies(PEN_UP_TIMEOUT_MS)); + +out: + return IRQ_HANDLED; +} + +static void bu21029_put_chip_in_reset(struct bu21029_ts_data *bu21029) +{ + if (bu21029->reset_gpios) { + gpiod_set_value_cansleep(bu21029->reset_gpios, 1); + usleep_range(STOP_DELAY_MIN_US, STOP_DELAY_MAX_US); + } +} + +static int bu21029_start_chip(struct input_dev *dev) +{ + struct bu21029_ts_data *bu21029 = input_get_drvdata(dev); + struct i2c_client *i2c = bu21029->client; + struct { + u8 reg; + u8 value; + } init_table[] = { + {BU21029_CFR0_REG, CFR0_VALUE}, + {BU21029_CFR1_REG, CFR1_VALUE}, + {BU21029_CFR2_REG, CFR2_VALUE}, + {BU21029_CFR3_REG, CFR3_VALUE}, + {BU21029_LDO_REG, LDO_VALUE} + }; + int error, i; + __be16 hwid; + + error = regulator_enable(bu21029->vdd); + if (error) { + dev_err(&i2c->dev, "failed to power up chip: %d", error); + return error; + } + + /* take chip out of reset */ + if (bu21029->reset_gpios) { + gpiod_set_value_cansleep(bu21029->reset_gpios, 0); + msleep(START_DELAY_MS); + } + + error = i2c_smbus_read_i2c_block_data(i2c, BU21029_HWID_REG, + sizeof(hwid), (u8 *)&hwid); + if (error < 0) { + dev_err(&i2c->dev, "failed to read HW ID\n"); + goto err_out; + } + + if (be16_to_cpu(hwid) != SUPPORTED_HWID) { + dev_err(&i2c->dev, + "unsupported HW ID 0x%x\n", be16_to_cpu(hwid)); + error = -ENODEV; + goto err_out; + } + + for (i = 0; i < ARRAY_SIZE(init_table); ++i) { + error = i2c_smbus_write_byte_data(i2c, + init_table[i].reg, + init_table[i].value); + if (error < 0) { + dev_err(&i2c->dev, + "failed to write %#02x to register %#02x: %d\n", + init_table[i].value, init_table[i].reg, + error); + goto err_out; + } + } + + error = i2c_smbus_write_byte(i2c, BU21029_AUTOSCAN); + if (error < 0) { + dev_err(&i2c->dev, "failed to start autoscan\n"); + goto err_out; + } + + enable_irq(bu21029->client->irq); + return 0; + +err_out: + bu21029_put_chip_in_reset(bu21029); + regulator_disable(bu21029->vdd); + return error; +} + +static void bu21029_stop_chip(struct input_dev *dev) +{ + struct bu21029_ts_data *bu21029 = input_get_drvdata(dev); + + disable_irq(bu21029->client->irq); + del_timer_sync(&bu21029->timer); + + bu21029_put_chip_in_reset(bu21029); + regulator_disable(bu21029->vdd); +} + +static int bu21029_probe(struct i2c_client *client) +{ + struct bu21029_ts_data *bu21029; + struct input_dev *in_dev; + int error; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_WRITE_BYTE | + I2C_FUNC_SMBUS_WRITE_BYTE_DATA | + I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { + dev_err(&client->dev, + "i2c functionality support is not sufficient\n"); + return -EIO; + } + + bu21029 = devm_kzalloc(&client->dev, sizeof(*bu21029), GFP_KERNEL); + if (!bu21029) + return -ENOMEM; + + error = device_property_read_u32(&client->dev, "rohm,x-plate-ohms", + &bu21029->x_plate_ohms); + if (error) { + dev_err(&client->dev, + "invalid 'x-plate-ohms' supplied: %d\n", error); + return error; + } + + bu21029->vdd = devm_regulator_get(&client->dev, "vdd"); + if (IS_ERR(bu21029->vdd)) { + error = PTR_ERR(bu21029->vdd); + if (error != -EPROBE_DEFER) + dev_err(&client->dev, + "failed to acquire 'vdd' supply: %d\n", error); + return error; + } + + bu21029->reset_gpios = devm_gpiod_get_optional(&client->dev, + "reset", GPIOD_OUT_HIGH); + if (IS_ERR(bu21029->reset_gpios)) { + error = PTR_ERR(bu21029->reset_gpios); + if (error != -EPROBE_DEFER) + dev_err(&client->dev, + "failed to acquire 'reset' gpio: %d\n", error); + return error; + } + + in_dev = devm_input_allocate_device(&client->dev); + if (!in_dev) { + dev_err(&client->dev, "unable to allocate input device\n"); + return -ENOMEM; + } + + bu21029->client = client; + bu21029->in_dev = in_dev; + timer_setup(&bu21029->timer, bu21029_touch_release, 0); + + in_dev->name = DRIVER_NAME; + in_dev->id.bustype = BUS_I2C; + in_dev->open = bu21029_start_chip; + in_dev->close = bu21029_stop_chip; + + input_set_capability(in_dev, EV_KEY, BTN_TOUCH); + input_set_abs_params(in_dev, ABS_X, 0, MAX_12BIT, 0, 0); + input_set_abs_params(in_dev, ABS_Y, 0, MAX_12BIT, 0, 0); + input_set_abs_params(in_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0); + touchscreen_parse_properties(in_dev, false, &bu21029->prop); + + input_set_drvdata(in_dev, bu21029); + + error = devm_request_threaded_irq(&client->dev, client->irq, + NULL, bu21029_touch_soft_irq, + IRQF_ONESHOT | IRQF_NO_AUTOEN, + DRIVER_NAME, bu21029); + if (error) { + dev_err(&client->dev, + "unable to request touch irq: %d\n", error); + return error; + } + + error = input_register_device(in_dev); + if (error) { + dev_err(&client->dev, + "unable to register input device: %d\n", error); + return error; + } + + i2c_set_clientdata(client, bu21029); + + return 0; +} + +static int __maybe_unused bu21029_suspend(struct device *dev) +{ + struct i2c_client *i2c = to_i2c_client(dev); + struct bu21029_ts_data *bu21029 = i2c_get_clientdata(i2c); + + if (!device_may_wakeup(dev)) { + mutex_lock(&bu21029->in_dev->mutex); + if (input_device_enabled(bu21029->in_dev)) + bu21029_stop_chip(bu21029->in_dev); + mutex_unlock(&bu21029->in_dev->mutex); + } + + return 0; +} + +static int __maybe_unused bu21029_resume(struct device *dev) +{ + struct i2c_client *i2c = to_i2c_client(dev); + struct bu21029_ts_data *bu21029 = i2c_get_clientdata(i2c); + + if (!device_may_wakeup(dev)) { + mutex_lock(&bu21029->in_dev->mutex); + if (input_device_enabled(bu21029->in_dev)) + bu21029_start_chip(bu21029->in_dev); + mutex_unlock(&bu21029->in_dev->mutex); + } + + return 0; +} +static SIMPLE_DEV_PM_OPS(bu21029_pm_ops, bu21029_suspend, bu21029_resume); + +static const struct i2c_device_id bu21029_ids[] = { + { DRIVER_NAME, 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, bu21029_ids); + +#ifdef CONFIG_OF +static const struct of_device_id bu21029_of_ids[] = { + { .compatible = "rohm,bu21029" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, bu21029_of_ids); +#endif + +static struct i2c_driver bu21029_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = of_match_ptr(bu21029_of_ids), + .pm = &bu21029_pm_ops, + }, + .id_table = bu21029_ids, + .probe_new = bu21029_probe, +}; +module_i2c_driver(bu21029_driver); + +MODULE_AUTHOR("Zhu Yi "); +MODULE_DESCRIPTION("Rohm BU21029 touchscreen controller driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3