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/staging/greybus/gpio.c | 627 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 627 insertions(+) create mode 100644 drivers/staging/greybus/gpio.c (limited to 'drivers/staging/greybus/gpio.c') diff --git a/drivers/staging/greybus/gpio.c b/drivers/staging/greybus/gpio.c new file mode 100644 index 000000000..8a7cf1d0e --- /dev/null +++ b/drivers/staging/greybus/gpio.c @@ -0,0 +1,627 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * GPIO Greybus driver. + * + * Copyright 2014 Google Inc. + * Copyright 2014 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "gbphy.h" + +struct gb_gpio_line { + /* The following has to be an array of line_max entries */ + /* --> make them just a flags field */ + u8 active: 1, + direction: 1, /* 0 = output, 1 = input */ + value: 1; /* 0 = low, 1 = high */ + u16 debounce_usec; + + u8 irq_type; + bool irq_type_pending; + bool masked; + bool masked_pending; +}; + +struct gb_gpio_controller { + struct gbphy_device *gbphy_dev; + struct gb_connection *connection; + u8 line_max; /* max line number */ + struct gb_gpio_line *lines; + + struct gpio_chip chip; + struct irq_chip irqc; + struct mutex irq_lock; +}; +#define gpio_chip_to_gb_gpio_controller(chip) \ + container_of(chip, struct gb_gpio_controller, chip) +#define irq_data_to_gpio_chip(d) (d->domain->host_data) + +static int gb_gpio_line_count_operation(struct gb_gpio_controller *ggc) +{ + struct gb_gpio_line_count_response response; + int ret; + + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_LINE_COUNT, + NULL, 0, &response, sizeof(response)); + if (!ret) + ggc->line_max = response.count; + return ret; +} + +static int gb_gpio_activate_operation(struct gb_gpio_controller *ggc, u8 which) +{ + struct gb_gpio_activate_request request; + struct gbphy_device *gbphy_dev = ggc->gbphy_dev; + int ret; + + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + return ret; + + request.which = which; + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_ACTIVATE, + &request, sizeof(request), NULL, 0); + if (ret) { + gbphy_runtime_put_autosuspend(gbphy_dev); + return ret; + } + + ggc->lines[which].active = true; + + return 0; +} + +static void gb_gpio_deactivate_operation(struct gb_gpio_controller *ggc, + u8 which) +{ + struct gbphy_device *gbphy_dev = ggc->gbphy_dev; + struct device *dev = &gbphy_dev->dev; + struct gb_gpio_deactivate_request request; + int ret; + + request.which = which; + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DEACTIVATE, + &request, sizeof(request), NULL, 0); + if (ret) { + dev_err(dev, "failed to deactivate gpio %u\n", which); + goto out_pm_put; + } + + ggc->lines[which].active = false; + +out_pm_put: + gbphy_runtime_put_autosuspend(gbphy_dev); +} + +static int gb_gpio_get_direction_operation(struct gb_gpio_controller *ggc, + u8 which) +{ + struct device *dev = &ggc->gbphy_dev->dev; + struct gb_gpio_get_direction_request request; + struct gb_gpio_get_direction_response response; + int ret; + u8 direction; + + request.which = which; + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_GET_DIRECTION, + &request, sizeof(request), + &response, sizeof(response)); + if (ret) + return ret; + + direction = response.direction; + if (direction && direction != 1) { + dev_warn(dev, "gpio %u direction was %u (should be 0 or 1)\n", + which, direction); + } + ggc->lines[which].direction = direction ? 1 : 0; + return 0; +} + +static int gb_gpio_direction_in_operation(struct gb_gpio_controller *ggc, + u8 which) +{ + struct gb_gpio_direction_in_request request; + int ret; + + request.which = which; + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DIRECTION_IN, + &request, sizeof(request), NULL, 0); + if (!ret) + ggc->lines[which].direction = 1; + return ret; +} + +static int gb_gpio_direction_out_operation(struct gb_gpio_controller *ggc, + u8 which, bool value_high) +{ + struct gb_gpio_direction_out_request request; + int ret; + + request.which = which; + request.value = value_high ? 1 : 0; + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DIRECTION_OUT, + &request, sizeof(request), NULL, 0); + if (!ret) + ggc->lines[which].direction = 0; + return ret; +} + +static int gb_gpio_get_value_operation(struct gb_gpio_controller *ggc, + u8 which) +{ + struct device *dev = &ggc->gbphy_dev->dev; + struct gb_gpio_get_value_request request; + struct gb_gpio_get_value_response response; + int ret; + u8 value; + + request.which = which; + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_GET_VALUE, + &request, sizeof(request), + &response, sizeof(response)); + if (ret) { + dev_err(dev, "failed to get value of gpio %u\n", which); + return ret; + } + + value = response.value; + if (value && value != 1) { + dev_warn(dev, "gpio %u value was %u (should be 0 or 1)\n", + which, value); + } + ggc->lines[which].value = value ? 1 : 0; + return 0; +} + +static void gb_gpio_set_value_operation(struct gb_gpio_controller *ggc, + u8 which, bool value_high) +{ + struct device *dev = &ggc->gbphy_dev->dev; + struct gb_gpio_set_value_request request; + int ret; + + if (ggc->lines[which].direction == 1) { + dev_warn(dev, "refusing to set value of input gpio %u\n", + which); + return; + } + + request.which = which; + request.value = value_high ? 1 : 0; + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_SET_VALUE, + &request, sizeof(request), NULL, 0); + if (ret) { + dev_err(dev, "failed to set value of gpio %u\n", which); + return; + } + + ggc->lines[which].value = request.value; +} + +static int gb_gpio_set_debounce_operation(struct gb_gpio_controller *ggc, + u8 which, u16 debounce_usec) +{ + struct gb_gpio_set_debounce_request request; + int ret; + + request.which = which; + request.usec = cpu_to_le16(debounce_usec); + ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_SET_DEBOUNCE, + &request, sizeof(request), NULL, 0); + if (!ret) + ggc->lines[which].debounce_usec = debounce_usec; + return ret; +} + +static void _gb_gpio_irq_mask(struct gb_gpio_controller *ggc, u8 hwirq) +{ + struct device *dev = &ggc->gbphy_dev->dev; + struct gb_gpio_irq_mask_request request; + int ret; + + request.which = hwirq; + ret = gb_operation_sync(ggc->connection, + GB_GPIO_TYPE_IRQ_MASK, + &request, sizeof(request), NULL, 0); + if (ret) + dev_err(dev, "failed to mask irq: %d\n", ret); +} + +static void _gb_gpio_irq_unmask(struct gb_gpio_controller *ggc, u8 hwirq) +{ + struct device *dev = &ggc->gbphy_dev->dev; + struct gb_gpio_irq_unmask_request request; + int ret; + + request.which = hwirq; + ret = gb_operation_sync(ggc->connection, + GB_GPIO_TYPE_IRQ_UNMASK, + &request, sizeof(request), NULL, 0); + if (ret) + dev_err(dev, "failed to unmask irq: %d\n", ret); +} + +static void _gb_gpio_irq_set_type(struct gb_gpio_controller *ggc, + u8 hwirq, u8 type) +{ + struct device *dev = &ggc->gbphy_dev->dev; + struct gb_gpio_irq_type_request request; + int ret; + + request.which = hwirq; + request.type = type; + + ret = gb_operation_sync(ggc->connection, + GB_GPIO_TYPE_IRQ_TYPE, + &request, sizeof(request), NULL, 0); + if (ret) + dev_err(dev, "failed to set irq type: %d\n", ret); +} + +static void gb_gpio_irq_mask(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_to_gpio_chip(d); + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + struct gb_gpio_line *line = &ggc->lines[d->hwirq]; + + line->masked = true; + line->masked_pending = true; +} + +static void gb_gpio_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_to_gpio_chip(d); + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + struct gb_gpio_line *line = &ggc->lines[d->hwirq]; + + line->masked = false; + line->masked_pending = true; +} + +static int gb_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *chip = irq_data_to_gpio_chip(d); + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + struct gb_gpio_line *line = &ggc->lines[d->hwirq]; + struct device *dev = &ggc->gbphy_dev->dev; + u8 irq_type; + + switch (type) { + case IRQ_TYPE_NONE: + irq_type = GB_GPIO_IRQ_TYPE_NONE; + break; + case IRQ_TYPE_EDGE_RISING: + irq_type = GB_GPIO_IRQ_TYPE_EDGE_RISING; + break; + case IRQ_TYPE_EDGE_FALLING: + irq_type = GB_GPIO_IRQ_TYPE_EDGE_FALLING; + break; + case IRQ_TYPE_EDGE_BOTH: + irq_type = GB_GPIO_IRQ_TYPE_EDGE_BOTH; + break; + case IRQ_TYPE_LEVEL_LOW: + irq_type = GB_GPIO_IRQ_TYPE_LEVEL_LOW; + break; + case IRQ_TYPE_LEVEL_HIGH: + irq_type = GB_GPIO_IRQ_TYPE_LEVEL_HIGH; + break; + default: + dev_err(dev, "unsupported irq type: %u\n", type); + return -EINVAL; + } + + line->irq_type = irq_type; + line->irq_type_pending = true; + + return 0; +} + +static void gb_gpio_irq_bus_lock(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_to_gpio_chip(d); + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + + mutex_lock(&ggc->irq_lock); +} + +static void gb_gpio_irq_bus_sync_unlock(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_to_gpio_chip(d); + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + struct gb_gpio_line *line = &ggc->lines[d->hwirq]; + + if (line->irq_type_pending) { + _gb_gpio_irq_set_type(ggc, d->hwirq, line->irq_type); + line->irq_type_pending = false; + } + + if (line->masked_pending) { + if (line->masked) + _gb_gpio_irq_mask(ggc, d->hwirq); + else + _gb_gpio_irq_unmask(ggc, d->hwirq); + line->masked_pending = false; + } + + mutex_unlock(&ggc->irq_lock); +} + +static int gb_gpio_request_handler(struct gb_operation *op) +{ + struct gb_connection *connection = op->connection; + struct gb_gpio_controller *ggc = gb_connection_get_data(connection); + struct device *dev = &ggc->gbphy_dev->dev; + struct gb_message *request; + struct gb_gpio_irq_event_request *event; + u8 type = op->type; + int irq, ret; + + if (type != GB_GPIO_TYPE_IRQ_EVENT) { + dev_err(dev, "unsupported unsolicited request: %u\n", type); + return -EINVAL; + } + + request = op->request; + + if (request->payload_size < sizeof(*event)) { + dev_err(dev, "short event received (%zu < %zu)\n", + request->payload_size, sizeof(*event)); + return -EINVAL; + } + + event = request->payload; + if (event->which > ggc->line_max) { + dev_err(dev, "invalid hw irq: %d\n", event->which); + return -EINVAL; + } + + irq = irq_find_mapping(ggc->chip.irq.domain, event->which); + if (!irq) { + dev_err(dev, "failed to find IRQ\n"); + return -EINVAL; + } + + ret = generic_handle_irq_safe(irq); + if (ret) + dev_err(dev, "failed to invoke irq handler\n"); + + return ret; +} + +static int gb_gpio_request(struct gpio_chip *chip, unsigned int offset) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + + return gb_gpio_activate_operation(ggc, (u8)offset); +} + +static void gb_gpio_free(struct gpio_chip *chip, unsigned int offset) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + + gb_gpio_deactivate_operation(ggc, (u8)offset); +} + +static int gb_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + u8 which; + int ret; + + which = (u8)offset; + ret = gb_gpio_get_direction_operation(ggc, which); + if (ret) + return ret; + + return ggc->lines[which].direction ? 1 : 0; +} + +static int gb_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + + return gb_gpio_direction_in_operation(ggc, (u8)offset); +} + +static int gb_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + + return gb_gpio_direction_out_operation(ggc, (u8)offset, !!value); +} + +static int gb_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + u8 which; + int ret; + + which = (u8)offset; + ret = gb_gpio_get_value_operation(ggc, which); + if (ret) + return ret; + + return ggc->lines[which].value; +} + +static void gb_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + + gb_gpio_set_value_operation(ggc, (u8)offset, !!value); +} + +static int gb_gpio_set_config(struct gpio_chip *chip, unsigned int offset, + unsigned long config) +{ + struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); + u32 debounce; + + if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) + return -ENOTSUPP; + + debounce = pinconf_to_config_argument(config); + if (debounce > U16_MAX) + return -EINVAL; + + return gb_gpio_set_debounce_operation(ggc, (u8)offset, (u16)debounce); +} + +static int gb_gpio_controller_setup(struct gb_gpio_controller *ggc) +{ + int ret; + + /* Now find out how many lines there are */ + ret = gb_gpio_line_count_operation(ggc); + if (ret) + return ret; + + ggc->lines = kcalloc(ggc->line_max + 1, sizeof(*ggc->lines), + GFP_KERNEL); + if (!ggc->lines) + return -ENOMEM; + + return ret; +} + +static int gb_gpio_probe(struct gbphy_device *gbphy_dev, + const struct gbphy_device_id *id) +{ + struct gb_connection *connection; + struct gb_gpio_controller *ggc; + struct gpio_chip *gpio; + struct gpio_irq_chip *girq; + struct irq_chip *irqc; + int ret; + + ggc = kzalloc(sizeof(*ggc), GFP_KERNEL); + if (!ggc) + return -ENOMEM; + + connection = + gb_connection_create(gbphy_dev->bundle, + le16_to_cpu(gbphy_dev->cport_desc->id), + gb_gpio_request_handler); + if (IS_ERR(connection)) { + ret = PTR_ERR(connection); + goto exit_ggc_free; + } + + ggc->connection = connection; + gb_connection_set_data(connection, ggc); + ggc->gbphy_dev = gbphy_dev; + gb_gbphy_set_data(gbphy_dev, ggc); + + ret = gb_connection_enable_tx(connection); + if (ret) + goto exit_connection_destroy; + + ret = gb_gpio_controller_setup(ggc); + if (ret) + goto exit_connection_disable; + + irqc = &ggc->irqc; + irqc->irq_mask = gb_gpio_irq_mask; + irqc->irq_unmask = gb_gpio_irq_unmask; + irqc->irq_set_type = gb_gpio_irq_set_type; + irqc->irq_bus_lock = gb_gpio_irq_bus_lock; + irqc->irq_bus_sync_unlock = gb_gpio_irq_bus_sync_unlock; + irqc->name = "greybus_gpio"; + + mutex_init(&ggc->irq_lock); + + gpio = &ggc->chip; + + gpio->label = "greybus_gpio"; + gpio->parent = &gbphy_dev->dev; + gpio->owner = THIS_MODULE; + + gpio->request = gb_gpio_request; + gpio->free = gb_gpio_free; + gpio->get_direction = gb_gpio_get_direction; + gpio->direction_input = gb_gpio_direction_input; + gpio->direction_output = gb_gpio_direction_output; + gpio->get = gb_gpio_get; + gpio->set = gb_gpio_set; + gpio->set_config = gb_gpio_set_config; + gpio->base = -1; /* Allocate base dynamically */ + gpio->ngpio = ggc->line_max + 1; + gpio->can_sleep = true; + + girq = &gpio->irq; + girq->chip = irqc; + /* The event comes from the outside so no parent handler */ + girq->parent_handler = NULL; + girq->num_parents = 0; + girq->parents = NULL; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_level_irq; + + ret = gb_connection_enable(connection); + if (ret) + goto exit_line_free; + + ret = gpiochip_add(gpio); + if (ret) { + dev_err(&gbphy_dev->dev, "failed to add gpio chip: %d\n", ret); + goto exit_line_free; + } + + gbphy_runtime_put_autosuspend(gbphy_dev); + return 0; + +exit_line_free: + kfree(ggc->lines); +exit_connection_disable: + gb_connection_disable(connection); +exit_connection_destroy: + gb_connection_destroy(connection); +exit_ggc_free: + kfree(ggc); + return ret; +} + +static void gb_gpio_remove(struct gbphy_device *gbphy_dev) +{ + struct gb_gpio_controller *ggc = gb_gbphy_get_data(gbphy_dev); + struct gb_connection *connection = ggc->connection; + int ret; + + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + gbphy_runtime_get_noresume(gbphy_dev); + + gb_connection_disable_rx(connection); + gpiochip_remove(&ggc->chip); + gb_connection_disable(connection); + gb_connection_destroy(connection); + kfree(ggc->lines); + kfree(ggc); +} + +static const struct gbphy_device_id gb_gpio_id_table[] = { + { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_GPIO) }, + { }, +}; +MODULE_DEVICE_TABLE(gbphy, gb_gpio_id_table); + +static struct gbphy_driver gpio_driver = { + .name = "gpio", + .probe = gb_gpio_probe, + .remove = gb_gpio_remove, + .id_table = gb_gpio_id_table, +}; + +module_gbphy_driver(gpio_driver); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3