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/iio/chemical/sunrise_co2.c | 537 +++++++++++++++++++++++++++++++++++++ 1 file changed, 537 insertions(+) create mode 100644 drivers/iio/chemical/sunrise_co2.c (limited to 'drivers/iio/chemical/sunrise_co2.c') diff --git a/drivers/iio/chemical/sunrise_co2.c b/drivers/iio/chemical/sunrise_co2.c new file mode 100644 index 000000000..8440dc0c7 --- /dev/null +++ b/drivers/iio/chemical/sunrise_co2.c @@ -0,0 +1,537 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Senseair Sunrise 006-0-0007 CO2 sensor driver. + * + * Copyright (C) 2021 Jacopo Mondi + * + * List of features not yet supported by the driver: + * - controllable EN pin + * - single-shot operations using the nDRY pin. + * - ABC/target calibration + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define DRIVER_NAME "sunrise_co2" + +#define SUNRISE_ERROR_STATUS_REG 0x00 +#define SUNRISE_CO2_FILTERED_COMP_REG 0x06 +#define SUNRISE_CHIP_TEMPERATURE_REG 0x08 +#define SUNRISE_CALIBRATION_STATUS_REG 0x81 +#define SUNRISE_CALIBRATION_COMMAND_REG 0x82 +#define SUNRISE_CALIBRATION_FACTORY_CMD 0x7c02 +#define SUNRISE_CALIBRATION_BACKGROUND_CMD 0x7c06 +/* + * The calibration timeout is not characterized in the datasheet. + * Use 30 seconds as a reasonable upper limit. + */ +#define SUNRISE_CALIBRATION_TIMEOUT_US (30 * USEC_PER_SEC) + +struct sunrise_dev { + struct i2c_client *client; + struct regmap *regmap; + /* Protects access to IIO attributes. */ + struct mutex lock; + bool ignore_nak; +}; + +/* Custom regmap read/write operations: perform unlocked access to the i2c bus. */ + +static int sunrise_regmap_read(void *context, const void *reg_buf, + size_t reg_size, void *val_buf, size_t val_size) +{ + struct i2c_client *client = context; + struct sunrise_dev *sunrise = i2c_get_clientdata(client); + union i2c_smbus_data data; + int ret; + + if (reg_size != 1 || !val_size) + return -EINVAL; + + memset(&data, 0, sizeof(data)); + data.block[0] = val_size; + + /* + * Wake up sensor by sending sensor address: START, sensor address, + * STOP. Sensor will not ACK this byte. + * + * The chip enters a low power state after 15ms without + * communications or after a complete read/write sequence. + */ + __i2c_smbus_xfer(client->adapter, client->addr, + sunrise->ignore_nak ? I2C_M_IGNORE_NAK : 0, + I2C_SMBUS_WRITE, 0, I2C_SMBUS_BYTE_DATA, &data); + + usleep_range(500, 1500); + + ret = __i2c_smbus_xfer(client->adapter, client->addr, client->flags, + I2C_SMBUS_READ, ((u8 *)reg_buf)[0], + I2C_SMBUS_I2C_BLOCK_DATA, &data); + if (ret < 0) + return ret; + + memcpy(val_buf, &data.block[1], data.block[0]); + + return 0; +} + +static int sunrise_regmap_write(void *context, const void *val_buf, size_t count) +{ + struct i2c_client *client = context; + struct sunrise_dev *sunrise = i2c_get_clientdata(client); + union i2c_smbus_data data; + + /* Discard reg address from values count. */ + if (!count) + return -EINVAL; + count--; + + memset(&data, 0, sizeof(data)); + data.block[0] = count; + memcpy(&data.block[1], (u8 *)val_buf + 1, count); + + __i2c_smbus_xfer(client->adapter, client->addr, + sunrise->ignore_nak ? I2C_M_IGNORE_NAK : 0, + I2C_SMBUS_WRITE, 0, I2C_SMBUS_BYTE_DATA, &data); + + usleep_range(500, 1500); + + return __i2c_smbus_xfer(client->adapter, client->addr, client->flags, + I2C_SMBUS_WRITE, ((u8 *)val_buf)[0], + I2C_SMBUS_I2C_BLOCK_DATA, &data); +} + +/* + * Sunrise i2c read/write operations: lock the i2c segment to avoid losing the + * wake up session. Use custom regmap operations that perform unlocked access to + * the i2c bus. + */ +static int sunrise_read_byte(struct sunrise_dev *sunrise, u8 reg) +{ + const struct i2c_client *client = sunrise->client; + const struct device *dev = &client->dev; + unsigned int val; + int ret; + + i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT); + ret = regmap_read(sunrise->regmap, reg, &val); + i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT); + if (ret) { + dev_err(dev, "Read byte failed: reg 0x%02x (%d)\n", reg, ret); + return ret; + } + + return val; +} + +static int sunrise_read_word(struct sunrise_dev *sunrise, u8 reg, u16 *val) +{ + const struct i2c_client *client = sunrise->client; + const struct device *dev = &client->dev; + __be16 be_val; + int ret; + + i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT); + ret = regmap_bulk_read(sunrise->regmap, reg, &be_val, sizeof(be_val)); + i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT); + if (ret) { + dev_err(dev, "Read word failed: reg 0x%02x (%d)\n", reg, ret); + return ret; + } + + *val = be16_to_cpu(be_val); + + return 0; +} + +static int sunrise_write_byte(struct sunrise_dev *sunrise, u8 reg, u8 val) +{ + const struct i2c_client *client = sunrise->client; + const struct device *dev = &client->dev; + int ret; + + i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT); + ret = regmap_write(sunrise->regmap, reg, val); + i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT); + if (ret) + dev_err(dev, "Write byte failed: reg 0x%02x (%d)\n", reg, ret); + + return ret; +} + +static int sunrise_write_word(struct sunrise_dev *sunrise, u8 reg, u16 data) +{ + const struct i2c_client *client = sunrise->client; + const struct device *dev = &client->dev; + __be16 be_data = cpu_to_be16(data); + int ret; + + i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT); + ret = regmap_bulk_write(sunrise->regmap, reg, &be_data, sizeof(be_data)); + i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT); + if (ret) + dev_err(dev, "Write word failed: reg 0x%02x (%d)\n", reg, ret); + + return ret; +} + +/* Trigger a calibration cycle. */ + +enum { + SUNRISE_CALIBRATION_FACTORY, + SUNRISE_CALIBRATION_BACKGROUND, +}; + +static const struct sunrise_calib_data { + u16 cmd; + u8 bit; + const char * const name; +} calib_data[] = { + [SUNRISE_CALIBRATION_FACTORY] = { + SUNRISE_CALIBRATION_FACTORY_CMD, + BIT(2), + "factory_calibration", + }, + [SUNRISE_CALIBRATION_BACKGROUND] = { + SUNRISE_CALIBRATION_BACKGROUND_CMD, + BIT(5), + "background_calibration", + }, +}; + +static int sunrise_calibrate(struct sunrise_dev *sunrise, + const struct sunrise_calib_data *data) +{ + unsigned int status; + int ret; + + /* Reset the calibration status reg. */ + ret = sunrise_write_byte(sunrise, SUNRISE_CALIBRATION_STATUS_REG, 0x00); + if (ret) + return ret; + + /* Write a calibration command and poll the calibration status bit. */ + ret = sunrise_write_word(sunrise, SUNRISE_CALIBRATION_COMMAND_REG, data->cmd); + if (ret) + return ret; + + dev_dbg(&sunrise->client->dev, "%s in progress\n", data->name); + + /* + * Calibration takes several seconds, so the sleep time between reads + * can be pretty relaxed. + */ + return read_poll_timeout(sunrise_read_byte, status, status & data->bit, + 200000, SUNRISE_CALIBRATION_TIMEOUT_US, false, + sunrise, SUNRISE_CALIBRATION_STATUS_REG); +} + +static ssize_t sunrise_cal_factory_write(struct iio_dev *iiodev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct sunrise_dev *sunrise = iio_priv(iiodev); + bool enable; + int ret; + + ret = kstrtobool(buf, &enable); + if (ret) + return ret; + + if (!enable) + return len; + + mutex_lock(&sunrise->lock); + ret = sunrise_calibrate(sunrise, &calib_data[SUNRISE_CALIBRATION_FACTORY]); + mutex_unlock(&sunrise->lock); + if (ret) + return ret; + + return len; +} + +static ssize_t sunrise_cal_background_write(struct iio_dev *iiodev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct sunrise_dev *sunrise = iio_priv(iiodev); + bool enable; + int ret; + + ret = kstrtobool(buf, &enable); + if (ret) + return ret; + + if (!enable) + return len; + + mutex_lock(&sunrise->lock); + ret = sunrise_calibrate(sunrise, &calib_data[SUNRISE_CALIBRATION_BACKGROUND]); + mutex_unlock(&sunrise->lock); + if (ret) + return ret; + + return len; +} + + /* Enumerate and retrieve the chip error status. */ +enum { + SUNRISE_ERROR_FATAL, + SUNRISE_ERROR_I2C, + SUNRISE_ERROR_ALGORITHM, + SUNRISE_ERROR_CALIBRATION, + SUNRISE_ERROR_SELF_DIAGNOSTIC, + SUNRISE_ERROR_OUT_OF_RANGE, + SUNRISE_ERROR_MEMORY, + SUNRISE_ERROR_NO_MEASUREMENT, + SUNRISE_ERROR_LOW_VOLTAGE, + SUNRISE_ERROR_MEASUREMENT_TIMEOUT, +}; + +static const char * const sunrise_error_statuses[] = { + [SUNRISE_ERROR_FATAL] = "error_fatal", + [SUNRISE_ERROR_I2C] = "error_i2c", + [SUNRISE_ERROR_ALGORITHM] = "error_algorithm", + [SUNRISE_ERROR_CALIBRATION] = "error_calibration", + [SUNRISE_ERROR_SELF_DIAGNOSTIC] = "error_self_diagnostic", + [SUNRISE_ERROR_OUT_OF_RANGE] = "error_out_of_range", + [SUNRISE_ERROR_MEMORY] = "error_memory", + [SUNRISE_ERROR_NO_MEASUREMENT] = "error_no_measurement", + [SUNRISE_ERROR_LOW_VOLTAGE] = "error_low_voltage", + [SUNRISE_ERROR_MEASUREMENT_TIMEOUT] = "error_measurement_timeout", +}; + +static const struct iio_enum sunrise_error_statuses_enum = { + .items = sunrise_error_statuses, + .num_items = ARRAY_SIZE(sunrise_error_statuses), +}; + +static ssize_t sunrise_error_status_read(struct iio_dev *iiodev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + struct sunrise_dev *sunrise = iio_priv(iiodev); + unsigned long errors; + ssize_t len = 0; + u16 value; + int ret; + u8 i; + + mutex_lock(&sunrise->lock); + ret = sunrise_read_word(sunrise, SUNRISE_ERROR_STATUS_REG, &value); + if (ret) { + mutex_unlock(&sunrise->lock); + return ret; + } + + errors = value; + for_each_set_bit(i, &errors, ARRAY_SIZE(sunrise_error_statuses)) + len += sysfs_emit_at(buf, len, "%s ", sunrise_error_statuses[i]); + + if (len) + buf[len - 1] = '\n'; + + mutex_unlock(&sunrise->lock); + + return len; +} + +static const struct iio_chan_spec_ext_info sunrise_concentration_ext_info[] = { + /* Calibration triggers. */ + { + .name = "calibration_factory", + .write = sunrise_cal_factory_write, + .shared = IIO_SEPARATE, + }, + { + .name = "calibration_background", + .write = sunrise_cal_background_write, + .shared = IIO_SEPARATE, + }, + + /* Error statuses. */ + { + .name = "error_status", + .read = sunrise_error_status_read, + .shared = IIO_SHARED_BY_ALL, + }, + { + .name = "error_status_available", + .shared = IIO_SHARED_BY_ALL, + .read = iio_enum_available_read, + .private = (uintptr_t)&sunrise_error_statuses_enum, + }, + {} +}; + +static const struct iio_chan_spec sunrise_channels[] = { + { + .type = IIO_CONCENTRATION, + .modified = 1, + .channel2 = IIO_MOD_CO2, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .ext_info = sunrise_concentration_ext_info, + }, + { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + }, +}; + +static int sunrise_read_raw(struct iio_dev *iio_dev, + const struct iio_chan_spec *chan, + int *val, int *val2, long mask) +{ + struct sunrise_dev *sunrise = iio_priv(iio_dev); + u16 value; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_CONCENTRATION: + mutex_lock(&sunrise->lock); + ret = sunrise_read_word(sunrise, SUNRISE_CO2_FILTERED_COMP_REG, + &value); + mutex_unlock(&sunrise->lock); + + if (ret) + return ret; + + *val = value; + return IIO_VAL_INT; + + case IIO_TEMP: + mutex_lock(&sunrise->lock); + ret = sunrise_read_word(sunrise, SUNRISE_CHIP_TEMPERATURE_REG, + &value); + mutex_unlock(&sunrise->lock); + + if (ret) + return ret; + + *val = value; + return IIO_VAL_INT; + + default: + return -EINVAL; + } + + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_CONCENTRATION: + /* + * 1 / 10^4 to comply with IIO scale for CO2 + * (percentage). The chip CO2 reading range is [400 - + * 5000] ppm which corresponds to [0,004 - 0,5] %. + */ + *val = 1; + *val2 = 10000; + return IIO_VAL_FRACTIONAL; + + case IIO_TEMP: + /* x10 to comply with IIO scale (millidegrees celsius). */ + *val = 10; + return IIO_VAL_INT; + + default: + return -EINVAL; + } + + default: + return -EINVAL; + } +} + +static const struct iio_info sunrise_info = { + .read_raw = sunrise_read_raw, +}; + +static const struct regmap_bus sunrise_regmap_bus = { + .read = sunrise_regmap_read, + .write = sunrise_regmap_write, +}; + +static const struct regmap_config sunrise_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int sunrise_probe(struct i2c_client *client) +{ + struct sunrise_dev *sunrise; + struct iio_dev *iio_dev; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_BLOCK_DATA)) { + dev_err(&client->dev, + "Adapter does not support required functionalities\n"); + return -EOPNOTSUPP; + } + + iio_dev = devm_iio_device_alloc(&client->dev, sizeof(*sunrise)); + if (!iio_dev) + return -ENOMEM; + + sunrise = iio_priv(iio_dev); + sunrise->client = client; + mutex_init(&sunrise->lock); + + i2c_set_clientdata(client, sunrise); + + sunrise->regmap = devm_regmap_init(&client->dev, &sunrise_regmap_bus, + client, &sunrise_regmap_config); + if (IS_ERR(sunrise->regmap)) { + dev_err(&client->dev, "Failed to initialize regmap\n"); + return PTR_ERR(sunrise->regmap); + } + + /* + * The chip nacks the wake up message. If the adapter does not support + * protocol mangling do not set the I2C_M_IGNORE_NAK flag at the expense + * of possible cruft in the logs. + */ + if (i2c_check_functionality(client->adapter, I2C_FUNC_PROTOCOL_MANGLING)) + sunrise->ignore_nak = true; + + iio_dev->info = &sunrise_info; + iio_dev->name = DRIVER_NAME; + iio_dev->channels = sunrise_channels; + iio_dev->num_channels = ARRAY_SIZE(sunrise_channels); + iio_dev->modes = INDIO_DIRECT_MODE; + + return devm_iio_device_register(&client->dev, iio_dev); +} + +static const struct of_device_id sunrise_of_match[] = { + { .compatible = "senseair,sunrise-006-0-0007" }, + {} +}; +MODULE_DEVICE_TABLE(of, sunrise_of_match); + +static struct i2c_driver sunrise_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = sunrise_of_match, + }, + .probe_new = sunrise_probe, +}; +module_i2c_driver(sunrise_driver); + +MODULE_AUTHOR("Jacopo Mondi "); +MODULE_DESCRIPTION("Senseair Sunrise 006-0-0007 CO2 sensor IIO driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3