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/keyboard/gpio_keys.c | 1075 ++++++++++++++++++++++++++++++++++++ 1 file changed, 1075 insertions(+) create mode 100644 drivers/input/keyboard/gpio_keys.c (limited to 'drivers/input/keyboard/gpio_keys.c') diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c new file mode 100644 index 000000000..5496482a3 --- /dev/null +++ b/drivers/input/keyboard/gpio_keys.c @@ -0,0 +1,1075 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for keys on GPIO lines capable of generating interrupts. + * + * Copyright 2005 Phil Blundell + * Copyright 2010, 2011 David Jander + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct gpio_button_data { + const struct gpio_keys_button *button; + struct input_dev *input; + struct gpio_desc *gpiod; + + unsigned short *code; + + struct hrtimer release_timer; + unsigned int release_delay; /* in msecs, for IRQ-only buttons */ + + struct delayed_work work; + struct hrtimer debounce_timer; + unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */ + + unsigned int irq; + unsigned int wakeup_trigger_type; + spinlock_t lock; + bool disabled; + bool key_pressed; + bool suspended; + bool debounce_use_hrtimer; +}; + +struct gpio_keys_drvdata { + const struct gpio_keys_platform_data *pdata; + struct input_dev *input; + struct mutex disable_lock; + unsigned short *keymap; + struct gpio_button_data data[]; +}; + +/* + * SYSFS interface for enabling/disabling keys and switches: + * + * There are 4 attributes under /sys/devices/platform/gpio-keys/ + * keys [ro] - bitmap of keys (EV_KEY) which can be + * disabled + * switches [ro] - bitmap of switches (EV_SW) which can be + * disabled + * disabled_keys [rw] - bitmap of keys currently disabled + * disabled_switches [rw] - bitmap of switches currently disabled + * + * Userland can change these values and hence disable event generation + * for each key (or switch). Disabling a key means its interrupt line + * is disabled. + * + * For example, if we have following switches set up as gpio-keys: + * SW_DOCK = 5 + * SW_CAMERA_LENS_COVER = 9 + * SW_KEYPAD_SLIDE = 10 + * SW_FRONT_PROXIMITY = 11 + * This is read from switches: + * 11-9,5 + * Next we want to disable proximity (11) and dock (5), we write: + * 11,5 + * to file disabled_switches. Now proximity and dock IRQs are disabled. + * This can be verified by reading the file disabled_switches: + * 11,5 + * If we now want to enable proximity (11) switch we write: + * 5 + * to disabled_switches. + * + * We can disable only those keys which don't allow sharing the irq. + */ + +/** + * get_n_events_by_type() - returns maximum number of events per @type + * @type: type of button (%EV_KEY, %EV_SW) + * + * Return value of this function can be used to allocate bitmap + * large enough to hold all bits for given type. + */ +static int get_n_events_by_type(int type) +{ + BUG_ON(type != EV_SW && type != EV_KEY); + + return (type == EV_KEY) ? KEY_CNT : SW_CNT; +} + +/** + * get_bm_events_by_type() - returns bitmap of supported events per @type + * @dev: input device from which bitmap is retrieved + * @type: type of button (%EV_KEY, %EV_SW) + * + * Return value of this function can be used to allocate bitmap + * large enough to hold all bits for given type. + */ +static const unsigned long *get_bm_events_by_type(struct input_dev *dev, + int type) +{ + BUG_ON(type != EV_SW && type != EV_KEY); + + return (type == EV_KEY) ? dev->keybit : dev->swbit; +} + +static void gpio_keys_quiesce_key(void *data) +{ + struct gpio_button_data *bdata = data; + + if (!bdata->gpiod) + hrtimer_cancel(&bdata->release_timer); + else if (bdata->debounce_use_hrtimer) + hrtimer_cancel(&bdata->debounce_timer); + else + cancel_delayed_work_sync(&bdata->work); +} + +/** + * gpio_keys_disable_button() - disables given GPIO button + * @bdata: button data for button to be disabled + * + * Disables button pointed by @bdata. This is done by masking + * IRQ line. After this function is called, button won't generate + * input events anymore. Note that one can only disable buttons + * that don't share IRQs. + * + * Make sure that @bdata->disable_lock is locked when entering + * this function to avoid races when concurrent threads are + * disabling buttons at the same time. + */ +static void gpio_keys_disable_button(struct gpio_button_data *bdata) +{ + if (!bdata->disabled) { + /* + * Disable IRQ and associated timer/work structure. + */ + disable_irq(bdata->irq); + gpio_keys_quiesce_key(bdata); + bdata->disabled = true; + } +} + +/** + * gpio_keys_enable_button() - enables given GPIO button + * @bdata: button data for button to be disabled + * + * Enables given button pointed by @bdata. + * + * Make sure that @bdata->disable_lock is locked when entering + * this function to avoid races with concurrent threads trying + * to enable the same button at the same time. + */ +static void gpio_keys_enable_button(struct gpio_button_data *bdata) +{ + if (bdata->disabled) { + enable_irq(bdata->irq); + bdata->disabled = false; + } +} + +/** + * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons + * @ddata: pointer to drvdata + * @buf: buffer where stringified bitmap is written + * @type: button type (%EV_KEY, %EV_SW) + * @only_disabled: does caller want only those buttons that are + * currently disabled or all buttons that can be + * disabled + * + * This function writes buttons that can be disabled to @buf. If + * @only_disabled is true, then @buf contains only those buttons + * that are currently disabled. Returns 0 on success or negative + * errno on failure. + */ +static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, + char *buf, unsigned int type, + bool only_disabled) +{ + int n_events = get_n_events_by_type(type); + unsigned long *bits; + ssize_t ret; + int i; + + bits = bitmap_zalloc(n_events, GFP_KERNEL); + if (!bits) + return -ENOMEM; + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + + if (bdata->button->type != type) + continue; + + if (only_disabled && !bdata->disabled) + continue; + + __set_bit(*bdata->code, bits); + } + + ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits); + buf[ret++] = '\n'; + buf[ret] = '\0'; + + bitmap_free(bits); + + return ret; +} + +/** + * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap + * @ddata: pointer to drvdata + * @buf: buffer from userspace that contains stringified bitmap + * @type: button type (%EV_KEY, %EV_SW) + * + * This function parses stringified bitmap from @buf and disables/enables + * GPIO buttons accordingly. Returns 0 on success and negative error + * on failure. + */ +static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, + const char *buf, unsigned int type) +{ + int n_events = get_n_events_by_type(type); + const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type); + unsigned long *bits; + ssize_t error; + int i; + + bits = bitmap_alloc(n_events, GFP_KERNEL); + if (!bits) + return -ENOMEM; + + error = bitmap_parselist(buf, bits, n_events); + if (error) + goto out; + + /* First validate */ + if (!bitmap_subset(bits, bitmap, n_events)) { + error = -EINVAL; + goto out; + } + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + + if (bdata->button->type != type) + continue; + + if (test_bit(*bdata->code, bits) && + !bdata->button->can_disable) { + error = -EINVAL; + goto out; + } + } + + mutex_lock(&ddata->disable_lock); + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + + if (bdata->button->type != type) + continue; + + if (test_bit(*bdata->code, bits)) + gpio_keys_disable_button(bdata); + else + gpio_keys_enable_button(bdata); + } + + mutex_unlock(&ddata->disable_lock); + +out: + bitmap_free(bits); + return error; +} + +#define ATTR_SHOW_FN(name, type, only_disabled) \ +static ssize_t gpio_keys_show_##name(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct platform_device *pdev = to_platform_device(dev); \ + struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ + \ + return gpio_keys_attr_show_helper(ddata, buf, \ + type, only_disabled); \ +} + +ATTR_SHOW_FN(keys, EV_KEY, false); +ATTR_SHOW_FN(switches, EV_SW, false); +ATTR_SHOW_FN(disabled_keys, EV_KEY, true); +ATTR_SHOW_FN(disabled_switches, EV_SW, true); + +/* + * ATTRIBUTES: + * + * /sys/devices/platform/gpio-keys/keys [ro] + * /sys/devices/platform/gpio-keys/switches [ro] + */ +static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); +static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); + +#define ATTR_STORE_FN(name, type) \ +static ssize_t gpio_keys_store_##name(struct device *dev, \ + struct device_attribute *attr, \ + const char *buf, \ + size_t count) \ +{ \ + struct platform_device *pdev = to_platform_device(dev); \ + struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ + ssize_t error; \ + \ + error = gpio_keys_attr_store_helper(ddata, buf, type); \ + if (error) \ + return error; \ + \ + return count; \ +} + +ATTR_STORE_FN(disabled_keys, EV_KEY); +ATTR_STORE_FN(disabled_switches, EV_SW); + +/* + * ATTRIBUTES: + * + * /sys/devices/platform/gpio-keys/disabled_keys [rw] + * /sys/devices/platform/gpio-keys/disables_switches [rw] + */ +static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, + gpio_keys_show_disabled_keys, + gpio_keys_store_disabled_keys); +static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, + gpio_keys_show_disabled_switches, + gpio_keys_store_disabled_switches); + +static struct attribute *gpio_keys_attrs[] = { + &dev_attr_keys.attr, + &dev_attr_switches.attr, + &dev_attr_disabled_keys.attr, + &dev_attr_disabled_switches.attr, + NULL, +}; +ATTRIBUTE_GROUPS(gpio_keys); + +static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) +{ + const struct gpio_keys_button *button = bdata->button; + struct input_dev *input = bdata->input; + unsigned int type = button->type ?: EV_KEY; + int state; + + state = bdata->debounce_use_hrtimer ? + gpiod_get_value(bdata->gpiod) : + gpiod_get_value_cansleep(bdata->gpiod); + if (state < 0) { + dev_err(input->dev.parent, + "failed to get gpio state: %d\n", state); + return; + } + + if (type == EV_ABS) { + if (state) + input_event(input, type, button->code, button->value); + } else { + input_event(input, type, *bdata->code, state); + } +} + +static void gpio_keys_debounce_event(struct gpio_button_data *bdata) +{ + gpio_keys_gpio_report_event(bdata); + input_sync(bdata->input); + + if (bdata->button->wakeup) + pm_relax(bdata->input->dev.parent); +} + +static void gpio_keys_gpio_work_func(struct work_struct *work) +{ + struct gpio_button_data *bdata = + container_of(work, struct gpio_button_data, work.work); + + gpio_keys_debounce_event(bdata); +} + +static enum hrtimer_restart gpio_keys_debounce_timer(struct hrtimer *t) +{ + struct gpio_button_data *bdata = + container_of(t, struct gpio_button_data, debounce_timer); + + gpio_keys_debounce_event(bdata); + + return HRTIMER_NORESTART; +} + +static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) +{ + struct gpio_button_data *bdata = dev_id; + + BUG_ON(irq != bdata->irq); + + if (bdata->button->wakeup) { + const struct gpio_keys_button *button = bdata->button; + + pm_stay_awake(bdata->input->dev.parent); + if (bdata->suspended && + (button->type == 0 || button->type == EV_KEY)) { + /* + * Simulate wakeup key press in case the key has + * already released by the time we got interrupt + * handler to run. + */ + input_report_key(bdata->input, button->code, 1); + } + } + + if (bdata->debounce_use_hrtimer) { + hrtimer_start(&bdata->debounce_timer, + ms_to_ktime(bdata->software_debounce), + HRTIMER_MODE_REL); + } else { + mod_delayed_work(system_wq, + &bdata->work, + msecs_to_jiffies(bdata->software_debounce)); + } + + return IRQ_HANDLED; +} + +static enum hrtimer_restart gpio_keys_irq_timer(struct hrtimer *t) +{ + struct gpio_button_data *bdata = container_of(t, + struct gpio_button_data, + release_timer); + struct input_dev *input = bdata->input; + + if (bdata->key_pressed) { + input_event(input, EV_KEY, *bdata->code, 0); + input_sync(input); + bdata->key_pressed = false; + } + + return HRTIMER_NORESTART; +} + +static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) +{ + struct gpio_button_data *bdata = dev_id; + struct input_dev *input = bdata->input; + unsigned long flags; + + BUG_ON(irq != bdata->irq); + + spin_lock_irqsave(&bdata->lock, flags); + + if (!bdata->key_pressed) { + if (bdata->button->wakeup) + pm_wakeup_event(bdata->input->dev.parent, 0); + + input_event(input, EV_KEY, *bdata->code, 1); + input_sync(input); + + if (!bdata->release_delay) { + input_event(input, EV_KEY, *bdata->code, 0); + input_sync(input); + goto out; + } + + bdata->key_pressed = true; + } + + if (bdata->release_delay) + hrtimer_start(&bdata->release_timer, + ms_to_ktime(bdata->release_delay), + HRTIMER_MODE_REL_HARD); +out: + spin_unlock_irqrestore(&bdata->lock, flags); + return IRQ_HANDLED; +} + +static int gpio_keys_setup_key(struct platform_device *pdev, + struct input_dev *input, + struct gpio_keys_drvdata *ddata, + const struct gpio_keys_button *button, + int idx, + struct fwnode_handle *child) +{ + const char *desc = button->desc ? button->desc : "gpio_keys"; + struct device *dev = &pdev->dev; + struct gpio_button_data *bdata = &ddata->data[idx]; + irq_handler_t isr; + unsigned long irqflags; + int irq; + int error; + + bdata->input = input; + bdata->button = button; + spin_lock_init(&bdata->lock); + + if (child) { + bdata->gpiod = devm_fwnode_gpiod_get(dev, child, + NULL, GPIOD_IN, desc); + if (IS_ERR(bdata->gpiod)) { + error = PTR_ERR(bdata->gpiod); + if (error == -ENOENT) { + /* + * GPIO is optional, we may be dealing with + * purely interrupt-driven setup. + */ + bdata->gpiod = NULL; + } else { + if (error != -EPROBE_DEFER) + dev_err(dev, "failed to get gpio: %d\n", + error); + return error; + } + } + } else if (gpio_is_valid(button->gpio)) { + /* + * Legacy GPIO number, so request the GPIO here and + * convert it to descriptor. + */ + unsigned flags = GPIOF_IN; + + if (button->active_low) + flags |= GPIOF_ACTIVE_LOW; + + error = devm_gpio_request_one(dev, button->gpio, flags, desc); + if (error < 0) { + dev_err(dev, "Failed to request GPIO %d, error %d\n", + button->gpio, error); + return error; + } + + bdata->gpiod = gpio_to_desc(button->gpio); + if (!bdata->gpiod) + return -EINVAL; + } + + if (bdata->gpiod) { + bool active_low = gpiod_is_active_low(bdata->gpiod); + + if (button->debounce_interval) { + error = gpiod_set_debounce(bdata->gpiod, + button->debounce_interval * 1000); + /* use timer if gpiolib doesn't provide debounce */ + if (error < 0) + bdata->software_debounce = + button->debounce_interval; + + /* + * If reading the GPIO won't sleep, we can use a + * hrtimer instead of a standard timer for the software + * debounce, to reduce the latency as much as possible. + */ + bdata->debounce_use_hrtimer = + !gpiod_cansleep(bdata->gpiod); + } + + if (button->irq) { + bdata->irq = button->irq; + } else { + irq = gpiod_to_irq(bdata->gpiod); + if (irq < 0) { + error = irq; + dev_err(dev, + "Unable to get irq number for GPIO %d, error %d\n", + button->gpio, error); + return error; + } + bdata->irq = irq; + } + + INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func); + + hrtimer_init(&bdata->debounce_timer, + CLOCK_REALTIME, HRTIMER_MODE_REL); + bdata->debounce_timer.function = gpio_keys_debounce_timer; + + isr = gpio_keys_gpio_isr; + irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; + + switch (button->wakeup_event_action) { + case EV_ACT_ASSERTED: + bdata->wakeup_trigger_type = active_low ? + IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING; + break; + case EV_ACT_DEASSERTED: + bdata->wakeup_trigger_type = active_low ? + IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING; + break; + case EV_ACT_ANY: + default: + /* + * For other cases, we are OK letting suspend/resume + * not reconfigure the trigger type. + */ + break; + } + } else { + if (!button->irq) { + dev_err(dev, "Found button without gpio or irq\n"); + return -EINVAL; + } + + bdata->irq = button->irq; + + if (button->type && button->type != EV_KEY) { + dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); + return -EINVAL; + } + + bdata->release_delay = button->debounce_interval; + hrtimer_init(&bdata->release_timer, + CLOCK_REALTIME, HRTIMER_MODE_REL_HARD); + bdata->release_timer.function = gpio_keys_irq_timer; + + isr = gpio_keys_irq_isr; + irqflags = 0; + + /* + * For IRQ buttons, there is no interrupt for release. + * So we don't need to reconfigure the trigger type for wakeup. + */ + } + + bdata->code = &ddata->keymap[idx]; + *bdata->code = button->code; + input_set_capability(input, button->type ?: EV_KEY, *bdata->code); + + /* + * Install custom action to cancel release timer and + * workqueue item. + */ + error = devm_add_action(dev, gpio_keys_quiesce_key, bdata); + if (error) { + dev_err(dev, "failed to register quiesce action, error: %d\n", + error); + return error; + } + + /* + * If platform has specified that the button can be disabled, + * we don't want it to share the interrupt line. + */ + if (!button->can_disable) + irqflags |= IRQF_SHARED; + + error = devm_request_any_context_irq(dev, bdata->irq, isr, irqflags, + desc, bdata); + if (error < 0) { + dev_err(dev, "Unable to claim irq %d; error %d\n", + bdata->irq, error); + return error; + } + + return 0; +} + +static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata) +{ + struct input_dev *input = ddata->input; + int i; + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + if (bdata->gpiod) + gpio_keys_gpio_report_event(bdata); + } + input_sync(input); +} + +static int gpio_keys_open(struct input_dev *input) +{ + struct gpio_keys_drvdata *ddata = input_get_drvdata(input); + const struct gpio_keys_platform_data *pdata = ddata->pdata; + int error; + + if (pdata->enable) { + error = pdata->enable(input->dev.parent); + if (error) + return error; + } + + /* Report current state of buttons that are connected to GPIOs */ + gpio_keys_report_state(ddata); + + return 0; +} + +static void gpio_keys_close(struct input_dev *input) +{ + struct gpio_keys_drvdata *ddata = input_get_drvdata(input); + const struct gpio_keys_platform_data *pdata = ddata->pdata; + + if (pdata->disable) + pdata->disable(input->dev.parent); +} + +/* + * Handlers for alternative sources of platform_data + */ + +/* + * Translate properties into platform_data + */ +static struct gpio_keys_platform_data * +gpio_keys_get_devtree_pdata(struct device *dev) +{ + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button *button; + struct fwnode_handle *child; + int nbuttons; + + nbuttons = device_get_child_node_count(dev); + if (nbuttons == 0) + return ERR_PTR(-ENODEV); + + pdata = devm_kzalloc(dev, + sizeof(*pdata) + nbuttons * sizeof(*button), + GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + button = (struct gpio_keys_button *)(pdata + 1); + + pdata->buttons = button; + pdata->nbuttons = nbuttons; + + pdata->rep = device_property_read_bool(dev, "autorepeat"); + + device_property_read_string(dev, "label", &pdata->name); + + device_for_each_child_node(dev, child) { + if (is_of_node(child)) + button->irq = + irq_of_parse_and_map(to_of_node(child), 0); + + if (fwnode_property_read_u32(child, "linux,code", + &button->code)) { + dev_err(dev, "Button without keycode\n"); + fwnode_handle_put(child); + return ERR_PTR(-EINVAL); + } + + fwnode_property_read_string(child, "label", &button->desc); + + if (fwnode_property_read_u32(child, "linux,input-type", + &button->type)) + button->type = EV_KEY; + + button->wakeup = + fwnode_property_read_bool(child, "wakeup-source") || + /* legacy name */ + fwnode_property_read_bool(child, "gpio-key,wakeup"); + + fwnode_property_read_u32(child, "wakeup-event-action", + &button->wakeup_event_action); + + button->can_disable = + fwnode_property_read_bool(child, "linux,can-disable"); + + if (fwnode_property_read_u32(child, "debounce-interval", + &button->debounce_interval)) + button->debounce_interval = 5; + + button++; + } + + return pdata; +} + +static const struct of_device_id gpio_keys_of_match[] = { + { .compatible = "gpio-keys", }, + { }, +}; +MODULE_DEVICE_TABLE(of, gpio_keys_of_match); + +static int gpio_keys_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); + struct fwnode_handle *child = NULL; + struct gpio_keys_drvdata *ddata; + struct input_dev *input; + int i, error; + int wakeup = 0; + + if (!pdata) { + pdata = gpio_keys_get_devtree_pdata(dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + } + + ddata = devm_kzalloc(dev, struct_size(ddata, data, pdata->nbuttons), + GFP_KERNEL); + if (!ddata) { + dev_err(dev, "failed to allocate state\n"); + return -ENOMEM; + } + + ddata->keymap = devm_kcalloc(dev, + pdata->nbuttons, sizeof(ddata->keymap[0]), + GFP_KERNEL); + if (!ddata->keymap) + return -ENOMEM; + + input = devm_input_allocate_device(dev); + if (!input) { + dev_err(dev, "failed to allocate input device\n"); + return -ENOMEM; + } + + ddata->pdata = pdata; + ddata->input = input; + mutex_init(&ddata->disable_lock); + + platform_set_drvdata(pdev, ddata); + input_set_drvdata(input, ddata); + + input->name = pdata->name ? : pdev->name; + input->phys = "gpio-keys/input0"; + input->dev.parent = dev; + input->open = gpio_keys_open; + input->close = gpio_keys_close; + + input->id.bustype = BUS_HOST; + input->id.vendor = 0x0001; + input->id.product = 0x0001; + input->id.version = 0x0100; + + input->keycode = ddata->keymap; + input->keycodesize = sizeof(ddata->keymap[0]); + input->keycodemax = pdata->nbuttons; + + /* Enable auto repeat feature of Linux input subsystem */ + if (pdata->rep) + __set_bit(EV_REP, input->evbit); + + for (i = 0; i < pdata->nbuttons; i++) { + const struct gpio_keys_button *button = &pdata->buttons[i]; + + if (!dev_get_platdata(dev)) { + child = device_get_next_child_node(dev, child); + if (!child) { + dev_err(dev, + "missing child device node for entry %d\n", + i); + return -EINVAL; + } + } + + error = gpio_keys_setup_key(pdev, input, ddata, + button, i, child); + if (error) { + fwnode_handle_put(child); + return error; + } + + if (button->wakeup) + wakeup = 1; + } + + fwnode_handle_put(child); + + error = input_register_device(input); + if (error) { + dev_err(dev, "Unable to register input device, error: %d\n", + error); + return error; + } + + device_init_wakeup(dev, wakeup); + + return 0; +} + +static int __maybe_unused +gpio_keys_button_enable_wakeup(struct gpio_button_data *bdata) +{ + int error; + + error = enable_irq_wake(bdata->irq); + if (error) { + dev_err(bdata->input->dev.parent, + "failed to configure IRQ %d as wakeup source: %d\n", + bdata->irq, error); + return error; + } + + if (bdata->wakeup_trigger_type) { + error = irq_set_irq_type(bdata->irq, + bdata->wakeup_trigger_type); + if (error) { + dev_err(bdata->input->dev.parent, + "failed to set wakeup trigger %08x for IRQ %d: %d\n", + bdata->wakeup_trigger_type, bdata->irq, error); + disable_irq_wake(bdata->irq); + return error; + } + } + + return 0; +} + +static void __maybe_unused +gpio_keys_button_disable_wakeup(struct gpio_button_data *bdata) +{ + int error; + + /* + * The trigger type is always both edges for gpio-based keys and we do + * not support changing wakeup trigger for interrupt-based keys. + */ + if (bdata->wakeup_trigger_type) { + error = irq_set_irq_type(bdata->irq, IRQ_TYPE_EDGE_BOTH); + if (error) + dev_warn(bdata->input->dev.parent, + "failed to restore interrupt trigger for IRQ %d: %d\n", + bdata->irq, error); + } + + error = disable_irq_wake(bdata->irq); + if (error) + dev_warn(bdata->input->dev.parent, + "failed to disable IRQ %d as wake source: %d\n", + bdata->irq, error); +} + +static int __maybe_unused +gpio_keys_enable_wakeup(struct gpio_keys_drvdata *ddata) +{ + struct gpio_button_data *bdata; + int error; + int i; + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + bdata = &ddata->data[i]; + if (bdata->button->wakeup) { + error = gpio_keys_button_enable_wakeup(bdata); + if (error) + goto err_out; + } + bdata->suspended = true; + } + + return 0; + +err_out: + while (i--) { + bdata = &ddata->data[i]; + if (bdata->button->wakeup) + gpio_keys_button_disable_wakeup(bdata); + bdata->suspended = false; + } + + return error; +} + +static void __maybe_unused +gpio_keys_disable_wakeup(struct gpio_keys_drvdata *ddata) +{ + struct gpio_button_data *bdata; + int i; + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + bdata = &ddata->data[i]; + bdata->suspended = false; + if (irqd_is_wakeup_set(irq_get_irq_data(bdata->irq))) + gpio_keys_button_disable_wakeup(bdata); + } +} + +static int gpio_keys_suspend(struct device *dev) +{ + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); + struct input_dev *input = ddata->input; + int error; + + if (device_may_wakeup(dev)) { + error = gpio_keys_enable_wakeup(ddata); + if (error) + return error; + } else { + mutex_lock(&input->mutex); + if (input_device_enabled(input)) + gpio_keys_close(input); + mutex_unlock(&input->mutex); + } + + return 0; +} + +static int gpio_keys_resume(struct device *dev) +{ + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); + struct input_dev *input = ddata->input; + int error = 0; + + if (device_may_wakeup(dev)) { + gpio_keys_disable_wakeup(ddata); + } else { + mutex_lock(&input->mutex); + if (input_device_enabled(input)) + error = gpio_keys_open(input); + mutex_unlock(&input->mutex); + } + + if (error) + return error; + + gpio_keys_report_state(ddata); + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); + +static void gpio_keys_shutdown(struct platform_device *pdev) +{ + int ret; + + ret = gpio_keys_suspend(&pdev->dev); + if (ret) + dev_err(&pdev->dev, "failed to shutdown\n"); +} + +static struct platform_driver gpio_keys_device_driver = { + .probe = gpio_keys_probe, + .shutdown = gpio_keys_shutdown, + .driver = { + .name = "gpio-keys", + .pm = pm_sleep_ptr(&gpio_keys_pm_ops), + .of_match_table = gpio_keys_of_match, + .dev_groups = gpio_keys_groups, + } +}; + +static int __init gpio_keys_init(void) +{ + return platform_driver_register(&gpio_keys_device_driver); +} + +static void __exit gpio_keys_exit(void) +{ + platform_driver_unregister(&gpio_keys_device_driver); +} + +late_initcall(gpio_keys_init); +module_exit(gpio_keys_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Phil Blundell "); +MODULE_DESCRIPTION("Keyboard driver for GPIOs"); +MODULE_ALIAS("platform:gpio-keys"); -- cgit v1.2.3