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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/misc/tsl2550.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski:
"Core:
- Add dedicated kmem_cache for typical/small skb->head, avoid having
to access struct page at kfree time, and improve memory use.
- Introduce sysctl to set default RPS configuration for new netdevs.
- Define Netlink protocol specification format which can be used to
describe messages used by each family and auto-generate parsers.
Add tools for generating kernel data structures and uAPI headers.
- Expose all net/core sysctls inside netns.
- Remove 4s sleep in netpoll if carrier is instantly detected on
boot.
- Add configurable limit of MDB entries per port, and port-vlan.
- Continue populating drop reasons throughout the stack.
- Retire a handful of legacy Qdiscs and classifiers.
Protocols:
- Support IPv4 big TCP (TSO frames larger than 64kB).
- Add IP_LOCAL_PORT_RANGE socket option, to control local port range
on socket by socket basis.
- Track and report in procfs number of MPTCP sockets used.
- Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
manager.
- IPv6: don't check net.ipv6.route.max_size and rely on garbage
collection to free memory (similarly to IPv4).
- Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).
- ICMP: add per-rate limit counters.
- Add support for user scanning requests in ieee802154.
- Remove static WEP support.
- Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
reporting.
- WiFi 7 EHT channel puncturing support (client & AP).
BPF:
- Add a rbtree data structure following the "next-gen data structure"
precedent set by recently added linked list, that is, by using
kfunc + kptr instead of adding a new BPF map type.
- Expose XDP hints via kfuncs with initial support for RX hash and
timestamp metadata.
- Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
better support decap on GRE tunnel devices not operating in collect
metadata.
- Improve x86 JIT's codegen for PROBE_MEM runtime error checks.
- Remove the need for trace_printk_lock for bpf_trace_printk and
bpf_trace_vprintk helpers.
- Extend libbpf's bpf_tracing.h support for tracing arguments of
kprobes/uprobes and syscall as a special case.
- Significantly reduce the search time for module symbols by
livepatch and BPF.
- Enable cpumasks to be used as kptrs, which is useful for tracing
programs tracking which tasks end up running on which CPUs in
different time intervals.
- Add support for BPF trampoline on s390x and riscv64.
- Add capability to export the XDP features supported by the NIC.
- Add __bpf_kfunc tag for marking kernel functions as kfuncs.
- Add cgroup.memory=nobpf kernel parameter option to disable BPF
memory accounting for container environments.
Netfilter:
- Remove the CLUSTERIP target. It has been marked as obsolete for
years, and we still have WARN splats wrt races of the out-of-band
/proc interface installed by this target.
- Add 'destroy' commands to nf_tables. They are identical to the
existing 'delete' commands, but do not return an error if the
referenced object (set, chain, rule...) did not exist.
Driver API:
- Improve cpumask_local_spread() locality to help NICs set the right
IRQ affinity on AMD platforms.
- Separate C22 and C45 MDIO bus transactions more clearly.
- Introduce new DCB table to control DSCP rewrite on egress.
- Support configuration of Physical Layer Collision Avoidance (PLCA)
Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
shared medium Ethernet.
- Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
preemption of low priority frames by high priority frames.
- Add support for controlling MACSec offload using netlink SET.
- Rework devlink instance refcounts to allow registration and
de-registration under the instance lock. Split the code into
multiple files, drop some of the unnecessarily granular locks and
factor out common parts of netlink operation handling.
- Add TX frame aggregation parameters (for USB drivers).
- Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
messages with notifications for debug.
- Allow offloading of UDP NEW connections via act_ct.
- Add support for per action HW stats in TC.
- Support hardware miss to TC action (continue processing in SW from
a specific point in the action chain).
- Warn if old Wireless Extension user space interface is used with
modern cfg80211/mac80211 drivers. Do not support Wireless
Extensions for Wi-Fi 7 devices at all. Everyone should switch to
using nl80211 interface instead.
- Improve the CAN bit timing configuration. Use extack to return
error messages directly to user space, update the SJW handling,
including the definition of a new default value that will benefit
CAN-FD controllers, by increasing their oscillator tolerance.
New hardware / drivers:
- Ethernet:
- nVidia BlueField-3 support (control traffic driver)
- Ethernet support for imx93 SoCs
- Motorcomm yt8531 gigabit Ethernet PHY
- onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
- Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
- Amlogic gxl MDIO mux
- WiFi:
- RealTek RTL8188EU (rtl8xxxu)
- Qualcomm Wi-Fi 7 devices (ath12k)
- CAN:
- Renesas R-Car V4H
Drivers:
- Bluetooth:
- Set Per Platform Antenna Gain (PPAG) for Intel controllers.
- Ethernet NICs:
- Intel (1G, igc):
- support TSN / Qbv / packet scheduling features of i226 model
- Intel (100G, ice):
- use GNSS subsystem instead of TTY
- multi-buffer XDP support
- extend support for GPIO pins to E823 devices
- nVidia/Mellanox:
- update the shared buffer configuration on PFC commands
- implement PTP adjphase function for HW offset control
- TC support for Geneve and GRE with VF tunnel offload
- more efficient crypto key management method
- multi-port eswitch support
- Netronome/Corigine:
- add DCB IEEE support
- support IPsec offloading for NFP3800
- Freescale/NXP (enetc):
- support XDP_REDIRECT for XDP non-linear buffers
- improve reconfig, avoid link flap and waiting for idle
- support MAC Merge layer
- Other NICs:
- sfc/ef100: add basic devlink support for ef100
- ionic: rx_push mode operation (writing descriptors via MMIO)
- bnxt: use the auxiliary bus abstraction for RDMA
- r8169: disable ASPM and reset bus in case of tx timeout
- cpsw: support QSGMII mode for J721e CPSW9G
- cpts: support pulse-per-second output
- ngbe: add an mdio bus driver
- usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
- r8152: handle devices with FW with NCM support
- amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
- virtio-net: support multi buffer XDP
- virtio/vsock: replace virtio_vsock_pkt with sk_buff
- tsnep: XDP support
- Ethernet high-speed switches:
- nVidia/Mellanox (mlxsw):
- add support for latency TLV (in FW control messages)
- Microchip (sparx5):
- separate explicit and implicit traffic forwarding rules, make
the implicit rules always active
- add support for egress DSCP rewrite
- IS0 VCAP support (Ingress Classification)
- IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
etc.)
- ES2 VCAP support (Egress Access Control)
- support for Per-Stream Filtering and Policing (802.1Q,
8.6.5.1)
- Ethernet embedded switches:
- Marvell (mv88e6xxx):
- add MAB (port auth) offload support
- enable PTP receive for mv88e6390
- NXP (ocelot):
- support MAC Merge layer
- support for the the vsc7512 internal copper phys
- Microchip:
- lan9303: convert to PHYLINK
- lan966x: support TC flower filter statistics
- lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
- lan937x: support Credit Based Shaper configuration
- ksz9477: support Energy Efficient Ethernet
- other:
- qca8k: convert to regmap read/write API, use bulk operations
- rswitch: Improve TX timestamp accuracy
- Intel WiFi (iwlwifi):
- EHT (Wi-Fi 7) rate reporting
- STEP equalizer support: transfer some STEP (connection to radio
on platforms with integrated wifi) related parameters from the
BIOS to the firmware.
- Qualcomm 802.11ax WiFi (ath11k):
- IPQ5018 support
- Fine Timing Measurement (FTM) responder role support
- channel 177 support
- MediaTek WiFi (mt76):
- per-PHY LED support
- mt7996: EHT (Wi-Fi 7) support
- Wireless Ethernet Dispatch (WED) reset support
- switch to using page pool allocator
- RealTek WiFi (rtw89):
- support new version of Bluetooth co-existance
- Mobile:
- rmnet: support TX aggregation"
* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
page_pool: add a comment explaining the fragment counter usage
net: ethtool: fix __ethtool_dev_mm_supported() implementation
ethtool: pse-pd: Fix double word in comments
xsk: add linux/vmalloc.h to xsk.c
sefltests: netdevsim: wait for devlink instance after netns removal
selftest: fib_tests: Always cleanup before exit
net/mlx5e: Align IPsec ASO result memory to be as required by hardware
net/mlx5e: TC, Set CT miss to the specific ct action instance
net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
net/mlx5: Refactor tc miss handling to a single function
net/mlx5: Kconfig: Make tc offload depend on tc skb extension
net/sched: flower: Support hardware miss to tc action
net/sched: flower: Move filter handle initialization earlier
net/sched: cls_api: Support hardware miss to tc action
net/sched: Rename user cookie and act cookie
sfc: fix builds without CONFIG_RTC_LIB
sfc: clean up some inconsistent indentings
net/mlx4_en: Introduce flexible array to silence overflow warning
net: lan966x: Fix possible deadlock inside PTP
net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
...
Diffstat (limited to 'drivers/misc/tsl2550.c')
-rw-r--r-- | drivers/misc/tsl2550.c | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/drivers/misc/tsl2550.c b/drivers/misc/tsl2550.c new file mode 100644 index 000000000..6c62b94e0 --- /dev/null +++ b/drivers/misc/tsl2550.c @@ -0,0 +1,450 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * tsl2550.c - Linux kernel modules for ambient light sensor + * + * Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it> + * Copyright (C) 2007 Eurotech S.p.A. <info@eurotech.it> + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/mutex.h> + +#define TSL2550_DRV_NAME "tsl2550" +#define DRIVER_VERSION "1.2" + +/* + * Defines + */ + +#define TSL2550_POWER_DOWN 0x00 +#define TSL2550_POWER_UP 0x03 +#define TSL2550_STANDARD_RANGE 0x18 +#define TSL2550_EXTENDED_RANGE 0x1d +#define TSL2550_READ_ADC0 0x43 +#define TSL2550_READ_ADC1 0x83 + +/* + * Structs + */ + +struct tsl2550_data { + struct i2c_client *client; + struct mutex update_lock; + + unsigned int power_state:1; + unsigned int operating_mode:1; +}; + +/* + * Global data + */ + +static const u8 TSL2550_MODE_RANGE[2] = { + TSL2550_STANDARD_RANGE, TSL2550_EXTENDED_RANGE, +}; + +/* + * Management functions + */ + +static int tsl2550_set_operating_mode(struct i2c_client *client, int mode) +{ + struct tsl2550_data *data = i2c_get_clientdata(client); + + int ret = i2c_smbus_write_byte(client, TSL2550_MODE_RANGE[mode]); + + data->operating_mode = mode; + + return ret; +} + +static int tsl2550_set_power_state(struct i2c_client *client, int state) +{ + struct tsl2550_data *data = i2c_get_clientdata(client); + int ret; + + if (state == 0) + ret = i2c_smbus_write_byte(client, TSL2550_POWER_DOWN); + else { + ret = i2c_smbus_write_byte(client, TSL2550_POWER_UP); + + /* On power up we should reset operating mode also... */ + tsl2550_set_operating_mode(client, data->operating_mode); + } + + data->power_state = state; + + return ret; +} + +static int tsl2550_get_adc_value(struct i2c_client *client, u8 cmd) +{ + int ret; + + ret = i2c_smbus_read_byte_data(client, cmd); + if (ret < 0) + return ret; + if (!(ret & 0x80)) + return -EAGAIN; + return ret & 0x7f; /* remove the "valid" bit */ +} + +/* + * LUX calculation + */ + +#define TSL2550_MAX_LUX 1846 + +static const u8 ratio_lut[] = { + 100, 100, 100, 100, 100, 100, 100, 100, + 100, 100, 100, 100, 100, 100, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 98, 98, 98, 98, 98, + 98, 98, 97, 97, 97, 97, 97, 96, + 96, 96, 96, 95, 95, 95, 94, 94, + 93, 93, 93, 92, 92, 91, 91, 90, + 89, 89, 88, 87, 87, 86, 85, 84, + 83, 82, 81, 80, 79, 78, 77, 75, + 74, 73, 71, 69, 68, 66, 64, 62, + 60, 58, 56, 54, 52, 49, 47, 44, + 42, 41, 40, 40, 39, 39, 38, 38, + 37, 37, 37, 36, 36, 36, 35, 35, + 35, 35, 34, 34, 34, 34, 33, 33, + 33, 33, 32, 32, 32, 32, 32, 31, + 31, 31, 31, 31, 30, 30, 30, 30, + 30, +}; + +static const u16 count_lut[] = { + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 16, 18, 20, 22, 24, 26, 28, 30, + 32, 34, 36, 38, 40, 42, 44, 46, + 49, 53, 57, 61, 65, 69, 73, 77, + 81, 85, 89, 93, 97, 101, 105, 109, + 115, 123, 131, 139, 147, 155, 163, 171, + 179, 187, 195, 203, 211, 219, 227, 235, + 247, 263, 279, 295, 311, 327, 343, 359, + 375, 391, 407, 423, 439, 455, 471, 487, + 511, 543, 575, 607, 639, 671, 703, 735, + 767, 799, 831, 863, 895, 927, 959, 991, + 1039, 1103, 1167, 1231, 1295, 1359, 1423, 1487, + 1551, 1615, 1679, 1743, 1807, 1871, 1935, 1999, + 2095, 2223, 2351, 2479, 2607, 2735, 2863, 2991, + 3119, 3247, 3375, 3503, 3631, 3759, 3887, 4015, +}; + +/* + * This function is described into Taos TSL2550 Designer's Notebook + * pages 2, 3. + */ +static int tsl2550_calculate_lux(u8 ch0, u8 ch1) +{ + unsigned int lux; + + /* Look up count from channel values */ + u16 c0 = count_lut[ch0]; + u16 c1 = count_lut[ch1]; + + /* Avoid division by 0 and count 1 cannot be greater than count 0 */ + if (c1 <= c0) + if (c0) { + /* + * Calculate ratio. + * Note: the "128" is a scaling factor + */ + u8 r = c1 * 128 / c0; + + /* Calculate LUX */ + lux = ((c0 - c1) * ratio_lut[r]) / 256; + } else + lux = 0; + else + return 0; + + /* LUX range check */ + return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux; +} + +/* + * SysFS support + */ + +static ssize_t tsl2550_show_power_state(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tsl2550_data *data = i2c_get_clientdata(to_i2c_client(dev)); + + return sprintf(buf, "%u\n", data->power_state); +} + +static ssize_t tsl2550_store_power_state(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tsl2550_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + int ret; + + if (val > 1) + return -EINVAL; + + mutex_lock(&data->update_lock); + ret = tsl2550_set_power_state(client, val); + mutex_unlock(&data->update_lock); + + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO, + tsl2550_show_power_state, tsl2550_store_power_state); + +static ssize_t tsl2550_show_operating_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tsl2550_data *data = i2c_get_clientdata(to_i2c_client(dev)); + + return sprintf(buf, "%u\n", data->operating_mode); +} + +static ssize_t tsl2550_store_operating_mode(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tsl2550_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + int ret; + + if (val > 1) + return -EINVAL; + + if (data->power_state == 0) + return -EBUSY; + + mutex_lock(&data->update_lock); + ret = tsl2550_set_operating_mode(client, val); + mutex_unlock(&data->update_lock); + + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(operating_mode, S_IWUSR | S_IRUGO, + tsl2550_show_operating_mode, tsl2550_store_operating_mode); + +static ssize_t __tsl2550_show_lux(struct i2c_client *client, char *buf) +{ + struct tsl2550_data *data = i2c_get_clientdata(client); + u8 ch0, ch1; + int ret; + + ret = tsl2550_get_adc_value(client, TSL2550_READ_ADC0); + if (ret < 0) + return ret; + ch0 = ret; + + ret = tsl2550_get_adc_value(client, TSL2550_READ_ADC1); + if (ret < 0) + return ret; + ch1 = ret; + + /* Do the job */ + ret = tsl2550_calculate_lux(ch0, ch1); + if (ret < 0) + return ret; + if (data->operating_mode == 1) + ret *= 5; + + return sprintf(buf, "%d\n", ret); +} + +static ssize_t tsl2550_show_lux1_input(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tsl2550_data *data = i2c_get_clientdata(client); + int ret; + + /* No LUX data if not operational */ + if (!data->power_state) + return -EBUSY; + + mutex_lock(&data->update_lock); + ret = __tsl2550_show_lux(client, buf); + mutex_unlock(&data->update_lock); + + return ret; +} + +static DEVICE_ATTR(lux1_input, S_IRUGO, + tsl2550_show_lux1_input, NULL); + +static struct attribute *tsl2550_attributes[] = { + &dev_attr_power_state.attr, + &dev_attr_operating_mode.attr, + &dev_attr_lux1_input.attr, + NULL +}; + +static const struct attribute_group tsl2550_attr_group = { + .attrs = tsl2550_attributes, +}; + +/* + * Initialization function + */ + +static int tsl2550_init_client(struct i2c_client *client) +{ + struct tsl2550_data *data = i2c_get_clientdata(client); + int err; + + /* + * Probe the chip. To do so we try to power up the device and then to + * read back the 0x03 code + */ + err = i2c_smbus_read_byte_data(client, TSL2550_POWER_UP); + if (err < 0) + return err; + if (err != TSL2550_POWER_UP) + return -ENODEV; + data->power_state = 1; + + /* Set the default operating mode */ + err = i2c_smbus_write_byte(client, + TSL2550_MODE_RANGE[data->operating_mode]); + if (err < 0) + return err; + + return 0; +} + +/* + * I2C init/probing/exit functions + */ + +static struct i2c_driver tsl2550_driver; +static int tsl2550_probe(struct i2c_client *client) +{ + struct i2c_adapter *adapter = client->adapter; + struct tsl2550_data *data; + int *opmode, err = 0; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE + | I2C_FUNC_SMBUS_READ_BYTE_DATA)) { + err = -EIO; + goto exit; + } + + data = kzalloc(sizeof(struct tsl2550_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + data->client = client; + i2c_set_clientdata(client, data); + + /* Check platform data */ + opmode = client->dev.platform_data; + if (opmode) { + if (*opmode < 0 || *opmode > 1) { + dev_err(&client->dev, "invalid operating_mode (%d)\n", + *opmode); + err = -EINVAL; + goto exit_kfree; + } + data->operating_mode = *opmode; + } else + data->operating_mode = 0; /* default mode is standard */ + dev_info(&client->dev, "%s operating mode\n", + data->operating_mode ? "extended" : "standard"); + + mutex_init(&data->update_lock); + + /* Initialize the TSL2550 chip */ + err = tsl2550_init_client(client); + if (err) + goto exit_kfree; + + /* Register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &tsl2550_attr_group); + if (err) + goto exit_kfree; + + dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION); + + return 0; + +exit_kfree: + kfree(data); +exit: + return err; +} + +static void tsl2550_remove(struct i2c_client *client) +{ + sysfs_remove_group(&client->dev.kobj, &tsl2550_attr_group); + + /* Power down the device */ + tsl2550_set_power_state(client, 0); + + kfree(i2c_get_clientdata(client)); +} + +#ifdef CONFIG_PM_SLEEP + +static int tsl2550_suspend(struct device *dev) +{ + return tsl2550_set_power_state(to_i2c_client(dev), 0); +} + +static int tsl2550_resume(struct device *dev) +{ + return tsl2550_set_power_state(to_i2c_client(dev), 1); +} + +static SIMPLE_DEV_PM_OPS(tsl2550_pm_ops, tsl2550_suspend, tsl2550_resume); +#define TSL2550_PM_OPS (&tsl2550_pm_ops) + +#else + +#define TSL2550_PM_OPS NULL + +#endif /* CONFIG_PM_SLEEP */ + +static const struct i2c_device_id tsl2550_id[] = { + { "tsl2550", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tsl2550_id); + +static const struct of_device_id tsl2550_of_match[] = { + { .compatible = "taos,tsl2550" }, + { } +}; +MODULE_DEVICE_TABLE(of, tsl2550_of_match); + +static struct i2c_driver tsl2550_driver = { + .driver = { + .name = TSL2550_DRV_NAME, + .of_match_table = tsl2550_of_match, + .pm = TSL2550_PM_OPS, + }, + .probe_new = tsl2550_probe, + .remove = tsl2550_remove, + .id_table = tsl2550_id, +}; + +module_i2c_driver(tsl2550_driver); + +MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); +MODULE_DESCRIPTION("TSL2550 ambient light sensor driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRIVER_VERSION); |