FM / linux

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux

Name	Size	Mode	Actions
amba/	-	0755	rm
avf/	-	0755	rm
bcma/	-	0755	rm
byteorder/	-	0755	rm
can/	-	0755	rm
ceph/	-	0755	rm
clk/	-	0755	rm
crush/	-	0755	rm
decompress/	-	0755	rm
dma/	-	0755	rm
dsa/	-	0755	rm
extcon/	-	0755	rm
firmware/	-	0755	rm
fpga/	-	0755	rm
fsl/	-	0755	rm
gpio/	-	0755	rm
hsi/	-	0755	rm
iio/	-	0755	rm
input/	-	0755	rm
irqchip/	-	0755	rm
isdn/	-	0755	rm
lockd/	-	0755	rm
mailbox/	-	0755	rm
mfd/	-	0755	rm
mlx4/	-	0755	rm
mlx5/	-	0755	rm
mmc/	-	0755	rm
mtd/	-	0755	rm
mux/	-	0755	rm
net/	-	0755	rm
netfilter/	-	0755	rm
netfilter_arp/	-	0755	rm
netfilter_bridge/	-	0755	rm
netfilter_ipv4/	-	0755	rm
netfilter_ipv6/	-	0755	rm
pcs/	-	0755	rm
perf/	-	0755	rm
phy/	-	0755	rm
pinctrl/	-	0755	rm
platform_data/	-	0755	rm
power/	-	0755	rm
qed/	-	0755	rm
raid/	-	0755	rm
regulator/	-	0755	rm
remoteproc/	-	0755	rm
reset/	-	0755	rm
rpmsg/	-	0755	rm
rtc/	-	0755	rm
sched/	-	0755	rm
soc/	-	0755	rm
soundwire/	-	0755	rm
spi/	-	0755	rm
ssb/	-	0755	rm
sunrpc/	-	0755	rm
ulpi/	-	0755	rm
unaligned/	-	0755	rm
usb/	-	0755	rm
uwb/	-	0755	rm
wimax/	-	0755	rm
8250_pci.h	1038	0644	edit dl rm
a.out.h	354	0644	edit dl rm
acct.h	2551	0644	edit dl rm
acpi.h	43130	0644	edit dl rm
acpi_apmt.h	367	0644	edit dl rm
acpi_dma.h	3300	0644	edit dl rm
acpi_iort.h	3235	0644	edit dl rm
acpi_pmtmr.h	674	0644	edit dl rm
adb.h	1832	0644	edit dl rm
adfs_fs.h	574	0644	edit dl rm
adxl.h	310	0644	edit dl rm
aer.h	1822	0644	edit dl rm
agpgart.h	3908	0644	edit dl rm
agp_backend.h	3534	0644	edit dl rm
ahci-remap.h	607	0644	edit dl rm
ahci_platform.h	1772	0644	edit dl rm
aio.h	651	0644	edit dl rm
alarmtimer.h	1875	0644	edit dl rm
altera_jtaguart.h	379	0644	edit dl rm
altera_uart.h	397	0644	edit dl rm
amd-iommu.h	6931	0644	edit dl rm
amd-pstate.h	3356	0644	edit dl rm
anon_inodes.h	494	0644	edit dl rm
aperture.h	1619	0644	edit dl rm
apm-emulation.h	1575	0644	edit dl rm
apm_bios.h	2746	0644	edit dl rm
apple-gmux.h	1459	0644	edit dl rm
apple_bl.h	498	0644	edit dl rm
arch_topology.h	1983	0644	edit dl rm
arm-cci.h	2058	0644	edit dl rm
arm-smccc.h	16066	0644	edit dl rm
arm_sdei.h	2641	0644	edit dl rm
array_size.h	332	0644	edit dl rm
ascii85.h	532	0644	edit dl rm
asn1.h	2039	0644	edit dl rm
asn1_ber_bytecode.h	2783	0644	edit dl rm
asn1_decoder.h	675	0644	edit dl rm
assoc_array.h	3156	0644	edit dl rm
assoc_array_priv.h	5630	0644	edit dl rm
async.h	4591	0644	edit dl rm
async_tx.h	7487	0644	edit dl rm
ata.h	33980	0644	edit dl rm
atalk.h	4550	0644	edit dl rm
ata_platform.h	729	0644	edit dl rm
ath9k_platform.h	1477	0644	edit dl rm
atm.h	287	0644	edit dl rm
atmdev.h	10457	0644	edit dl rm
atmel-mci.h	1429	0644	edit dl rm
atmel-ssc.h	9971	0644	edit dl rm
atmel_pdc.h	1502	0644	edit dl rm
atmel_tc.h	11600	0644	edit dl rm
atm_suni.h	253	0644	edit dl rm
atm_tcp.h	511	0644	edit dl rm
atomic.h	37546	0644	edit dl rm
attribute_container.h	2799	0644	edit dl rm
audit.h	20332	0644	edit dl rm
audit_arch.h	559	0644	edit dl rm
auto_dev-ioctl.h	454	0644	edit dl rm
auto_fs.h	436	0644	edit dl rm
auxiliary_bus.h	2787	0644	edit dl rm
auxvec.h	304	0644	edit dl rm
average.h	2481	0644	edit dl rm
b1pcmcia.h	666	0644	edit dl rm
backing-dev-defs.h	10327	0644	edit dl rm
backing-dev.h	12260	0644	edit dl rm
backlight.h	13447	0644	edit dl rm
badblocks.h	2188	0644	edit dl rm
balloon_compaction.h	6745	0644	edit dl rm
bcd.h	559	0644	edit dl rm
bch.h	2660	0644	edit dl rm
bcm47xx_nvram.h	1247	0644	edit dl rm
bcm47xx_sprom.h	600	0644	edit dl rm
bcm47xx_wdt.h	555	0644	edit dl rm
bcm963xx_nvram.h	3036	0644	edit dl rm
bcm963xx_tag.h	3685	0644	edit dl rm
binfmts.h	5443	0644	edit dl rm
bio.h	20690	0644	edit dl rm
bitfield.h	5899	0644	edit dl rm
bitmap.h	21496	0644	edit dl rm
bitops.h	8870	0644	edit dl rm
bitrev.h	2541	0644	edit dl rm
bits.h	1512	0644	edit dl rm
bit_spinlock.h	2360	0644	edit dl rm
blk-cgroup.h	22728	0644	edit dl rm
blk-mq-pci.h	269	0644	edit dl rm
blk-mq-rdma.h	234	0644	edit dl rm
blk-mq-virtio.h	293	0644	edit dl rm
blk-mq.h	16074	0644	edit dl rm
blk-pm.h	717	0644	edit dl rm
blkdev.h	58898	0644	edit dl rm
blkpg.h	436	0644	edit dl rm
blktrace_api.h	3777	0644	edit dl rm
blk_types.h	15342	0644	edit dl rm
blockgroup_lock.h	810	0644	edit dl rm
bma150.h	1938	0644	edit dl rm
bottom_half.h	803	0644	edit dl rm
bpf-cgroup.h	19818	0644	edit dl rm
bpf-netns.h	1559	0644	edit dl rm
bpf.h	73387	0644	edit dl rm
bpfilter.h	791	0644	edit dl rm
bpfptr.h	1733	0644	edit dl rm
bpf_lirc.h	698	0644	edit dl rm
bpf_local_storage.h	5349	0644	edit dl rm
bpf_lsm.h	1431	0644	edit dl rm
bpf_trace.h	166	0644	edit dl rm
bpf_types.h	5395	0644	edit dl rm
bpf_verifier.h	18791	0644	edit dl rm
brcmphy.h	14023	0644	edit dl rm
bsearch.h	275	0644	edit dl rm
bsg-lib.h	2455	0644	edit dl rm
bsg.h	1094	0644	edit dl rm
btf.h	7363	0644	edit dl rm
btf_ids.h	5174	0644	edit dl rm
btree-128.h	2737	0644	edit dl rm
btree-type.h	3991	0644	edit dl rm
btree.h	6999	0644	edit dl rm
btrfs.h	145	0644	edit dl rm
buffer_head.h	14379	0644	edit dl rm
bug.h	1967	0644	edit dl rm
buildid.h	248	0644	edit dl rm
build_bug.h	3066	0644	edit dl rm
bvec.h	4119	0644	edit dl rm
c2port.h	1529	0644	edit dl rm
cache.h	2182	0644	edit dl rm
cacheinfo.h	4796	0644	edit dl rm
capability.h	8179	0644	edit dl rm
cb710.h	5827	0644	edit dl rm
cciss_ioctl.h	1053	0644	edit dl rm
ccp.h	18697	0644	edit dl rm
cc_platform.h	3140	0644	edit dl rm
cdev.h	845	0644	edit dl rm
cdrom.h	9193	0644	edit dl rm
cfag12864b.h	1499	0644	edit dl rm
cgroup-defs.h	27242	0644	edit dl rm
cgroup.h	28880	0644	edit dl rm
cgroup_rdma.h	1358	0644	edit dl rm
cgroup_subsys.h	1259	0644	edit dl rm
circ_buf.h	1120	0644	edit dl rm
cleancache.h	3982	0644	edit dl rm
cleanup.h	14215	0644	edit dl rm
clk-provider.h	37542	0644	edit dl rm
clk.h	25157	0644	edit dl rm
clkdev.h	1698	0644	edit dl rm
clockchips.h	7445	0644	edit dl rm
clocksource.h	9188	0644	edit dl rm
clock_cooling.h	2106	0644	edit dl rm
cm4000_cs.h	199	0644	edit dl rm
cma.h	1212	0644	edit dl rm
cmdline-parser.h	1238	0644	edit dl rm
cnt32_to_63.h	3691	0644	edit dl rm
cn_proc.h	1890	0644	edit dl rm
coda.h	2244	0644	edit dl rm
coda_psdev.h	2692	0644	edit dl rm
compaction.h	7654	0644	edit dl rm
compat.h	35739	0644	edit dl rm
compat_time.h	499	0644	edit dl rm
compiler-clang.h	2446	0644	edit dl rm
compiler-gcc.h	5756	0644	edit dl rm
compiler-intel.h	949	0644	edit dl rm
compiler.h	15718	0644	edit dl rm
compiler_attributes.h	10600	0644	edit dl rm
compiler_types.h	6931	0644	edit dl rm
completion.h	4201	0644	edit dl rm
component.h	4459	0644	edit dl rm
concap.h	3778	0644	edit dl rm
configfs.h	9441	0644	edit dl rm
connector.h	2490	0644	edit dl rm
console.h	7504	0644	edit dl rm
consolemap.h	1068	0644	edit dl rm
console_struct.h	6966	0644	edit dl rm
const.h	421	0644	edit dl rm
container.h	668	0644	edit dl rm
container_of.h	1278	0644	edit dl rm
context_tracking.h	5168	0644	edit dl rm
context_tracking_state.h	1529	0644	edit dl rm
cookie.h	1254	0644	edit dl rm
cordic.h	1794	0644	edit dl rm
coredump.h	797	0644	edit dl rm
coresight-pmu.h	989	0644	edit dl rm
coresight-stm.h	152	0644	edit dl rm
coresight.h	9676	0644	edit dl rm
counter.h	15497	0644	edit dl rm
counter_enum.h	1463	0644	edit dl rm
count_zeros.h	1660	0644	edit dl rm
cper.h	16826	0644	edit dl rm
cpu.h	7959	0644	edit dl rm
cpufeature.h	1882	0644	edit dl rm
cpufreq.h	34248	0644	edit dl rm
cpuhotplug.h	14269	0644	edit dl rm
cpuidle.h	13061	0644	edit dl rm
cpuidle_haltpoll.h	312	0644	edit dl rm
cpumask.h	29721	0644	edit dl rm
cpuset.h	8297	0644	edit dl rm
cpu_cooling.h	2389	0644	edit dl rm
cpu_pm.h	2850	0644	edit dl rm
cpu_rmap.h	1902	0644	edit dl rm
crash_core.h	3292	0644	edit dl rm
crash_dump.h	5193	0644	edit dl rm
crc-ccitt.h	609	0644	edit dl rm
crc-itu-t.h	613	0644	edit dl rm
crc-t10dif.h	453	0644	edit dl rm
crc4.h	192	0644	edit dl rm
crc7.h	316	0644	edit dl rm
crc8.h	3747	0644	edit dl rm
crc16.h	622	0644	edit dl rm
crc32.h	2894	0644	edit dl rm
crc32c.h	331	0644	edit dl rm
crc32poly.h	610	0644	edit dl rm
cred.h	12749	0644	edit dl rm
crypto.h	59393	0644	edit dl rm
cryptohash.h	546	0644	edit dl rm
cs5535.h	6426	0644	edit dl rm
ctype.h	1791	0644	edit dl rm
cuda.h	501	0644	edit dl rm
cxl_err.h	468	0644	edit dl rm
cyclades.h	10607	0644	edit dl rm
damon.h	19616	0644	edit dl rm
davinci_emac.h	1150	0644	edit dl rm
dax.h	7553	0644	edit dl rm
dca.h	2698	0644	edit dl rm
dcache.h	19621	0644	edit dl rm
dccp.h	10989	0644	edit dl rm
dcookies.h	1329	0644	edit dl rm
debugfs.h	11921	0644	edit dl rm
debugobjects.h	3988	0644	edit dl rm
debug_locks.h	1627	0644	edit dl rm
delay.h	2335	0644	edit dl rm
delayacct.h	6285	0644	edit dl rm
delayed_call.h	709	0644	edit dl rm
dell-led.h	128	0644	edit dl rm
devcoredump.h	2849	0644	edit dl rm
devfreq-event.h	5778	0644	edit dl rm
devfreq.h	12987	0644	edit dl rm
devfreq_cooling.h	3608	0644	edit dl rm
device-mapper.h	19529	0644	edit dl rm
device.h	67275	0644	edit dl rm
device_cgroup.h	1680	0644	edit dl rm
devm-helpers.h	2740	0644	edit dl rm
devpts_fs.h	1314	0644	edit dl rm
dev_printk.h	7731	0644	edit dl rm
digsig.h	1379	0644	edit dl rm
dim.h	8951	0644	edit dl rm
dio.h	11229	0644	edit dl rm
dirent.h	216	0644	edit dl rm
dlm.h	7240	0644	edit dl rm
dlm_plock.h	678	0644	edit dl rm
dm-bufio.h	4574	0644	edit dl rm
dm-dirty-log.h	4038	0644	edit dl rm
dm-io.h	1980	0644	edit dl rm
dm-kcopyd.h	3013	0644	edit dl rm
dm-region-hash.h	3182	0644	edit dl rm
dm9000.h	1136	0644	edit dl rm
dma-buf.h	21547	0644	edit dl rm
dma-contiguous.h	5070	0644	edit dl rm
dma-direct.h	3681	0644	edit dl rm
dma-direction.h	407	0644	edit dl rm
dma-fence-array.h	2983	0644	edit dl rm
dma-fence-chain.h	3576	0644	edit dl rm
dma-fence-unwrap.h	2298	0644	edit dl rm
dma-fence.h	21162	0644	edit dl rm
dma-iommu.h	3020	0644	edit dl rm
dma-map-ops.h	10863	0644	edit dl rm
dma-mapping.h	23170	0644	edit dl rm
dma-resv.h	17245	0644	edit dl rm
dmaengine.h	54891	0644	edit dl rm
dmapool.h	1832	0644	edit dl rm
dmar.h	8791	0644	edit dl rm
dmi.h	4375	0644	edit dl rm
dnotify.h	1047	0644	edit dl rm
dns_resolver.h	1339	0644	edit dl rm
dqblk_qtree.h	2238	0644	edit dl rm
dqblk_v1.h	327	0644	edit dl rm
dqblk_v2.h	406	0644	edit dl rm
drbd.h	10923	0644	edit dl rm
drbd_genl.h	22010	0644	edit dl rm
drbd_genl_api.h	1808	0644	edit dl rm
drbd_limits.h	8003	0644	edit dl rm
ds2782_battery.h	158	0644	edit dl rm
dtlk.h	3584	0644	edit dl rm
dw_apb_timer.h	1743	0644	edit dl rm
dynamic_debug.h	5831	0644	edit dl rm
dynamic_queue_limits.h	3812	0644	edit dl rm
earlycpio.h	359	0644	edit dl rm
ecryptfs.h	3915	0644	edit dl rm
edac.h	20718	0644	edit dl rm
edd.h	1469	0644	edit dl rm
edma.h	807	0644	edit dl rm
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eeprom_93xx46.h	776	0644	edit dl rm
efi-bgrt.h	644	0644	edit dl rm
efi.h	62813	0644	edit dl rm
efs_vh.h	1585	0644	edit dl rm
eisa.h	3031	0644	edit dl rm
elevator.h	6059	0644	edit dl rm
elf-fdpic.h	2237	0644	edit dl rm
elf-randomize.h	583	0644	edit dl rm
elf.h	1565	0644	edit dl rm
elfcore-compat.h	1267	0644	edit dl rm
elfcore.h	2160	0644	edit dl rm
elfnote.h	3625	0644	edit dl rm
enclosure.h	4711	0644	edit dl rm
energy_model.h	5994	0644	edit dl rm
err.h	1583	0644	edit dl rm
errname.h	283	0644	edit dl rm
errno.h	1424	0644	edit dl rm
error-injection.h	607	0644	edit dl rm
errqueue.h	524	0644	edit dl rm
errseq.h	382	0644	edit dl rm
etherdevice.h	16917	0644	edit dl rm
ethtool.h	35580	0644	edit dl rm
ethtool_netlink.h	1920	0644	edit dl rm
eventfd.h	2167	0644	edit dl rm
eventpoll.h	2457	0644	edit dl rm
evm.h	2985	0644	edit dl rm
export.h	3697	0644	edit dl rm
exportfs.h	7692	0644	edit dl rm
ext2_fs.h	967	0644	edit dl rm
extable.h	1309	0644	edit dl rm
extcon-provider.h	4431	0644	edit dl rm
extcon.h	10270	0644	edit dl rm
f2fs_fs.h	18526	0644	edit dl rm
f75375s.h	541	0644	edit dl rm
falloc.h	1719	0644	edit dl rm
fanotify.h	2336	0644	edit dl rm
fault-inject.h	1975	0644	edit dl rm
fb.h	28712	0644	edit dl rm
fbcon.h	2136	0644	edit dl rm
fcdevice.h	988	0644	edit dl rm
fcntl.h	1808	0644	edit dl rm
fd.h	490	0644	edit dl rm
fddidevice.h	1044	0644	edit dl rm
fdtable.h	3616	0644	edit dl rm
fec.h	609	0644	edit dl rm
file.h	3147	0644	edit dl rm
filter.h	42781	0644	edit dl rm
fips.h	167	0644	edit dl rm
firewire.h	13868	0644	edit dl rm
firmware-map.h	1351	0644	edit dl rm
firmware.h	5874	0644	edit dl rm
fixp-arith.h	4516	0644	edit dl rm
flat.h	1653	0644	edit dl rm
flex_array.h	4412	0644	edit dl rm
flex_proportions.h	2881	0644	edit dl rm
fmc-sdb.h	1319	0644	edit dl rm
fmc.h	9877	0644	edit dl rm
font.h	1598	0644	edit dl rm
fortify-string.h	16550	0644	edit dl rm
freezer.h	9257	0644	edit dl rm
frontswap.h	3121	0644	edit dl rm
fs.h	118914	0644	edit dl rm
fscache-cache.h	19254	0644	edit dl rm
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fsi.h	2424	0644	edit dl rm
fsl-diu-fb.h	4179	0644	edit dl rm
fsldma.h	398	0644	edit dl rm
fsl_devices.h	4430	0644	edit dl rm
fsl_hypervisor.h	2824	0644	edit dl rm
fsl_ifc.h	25658	0644	edit dl rm
fsnotify.h	7796	0644	edit dl rm
fsnotify_backend.h	20665	0644	edit dl rm
fs_context.h	9097	0644	edit dl rm
fs_enet_pd.h	3457	0644	edit dl rm
fs_parser.h	4750	0644	edit dl rm
fs_pin.h	619	0644	edit dl rm
fs_stack.h	811	0644	edit dl rm
fs_struct.h	1751	0644	edit dl rm
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gcd.h	193	0644	edit dl rm
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genetlink.h	1379	0644	edit dl rm
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getcpu.h	641	0644	edit dl rm
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goldfish.h	605	0644	edit dl rm
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gpio.h	5478	0644	edit dl rm
gpio_keys.h	1782	0644	edit dl rm
hardirq.h	3264	0644	edit dl rm
hash.h	2998	0644	edit dl rm
hashtable.h	6805	0644	edit dl rm
hdlc.h	3413	0644	edit dl rm
hdlcdrv.h	6470	0644	edit dl rm
hdmi.h	12851	0644	edit dl rm
hid-debug.h	1458	0644	edit dl rm
hid-roccat.h	484	0644	edit dl rm
hid-sensor-hub.h	9190	0644	edit dl rm
hid-sensor-ids.h	7617	0644	edit dl rm
hid.h	38339	0644	edit dl rm
hidden.h	966	0644	edit dl rm
hiddev.h	1458	0644	edit dl rm
hidraw.h	1146	0644	edit dl rm
highmem-internal.h	4952	0644	edit dl rm
highmem.h	8235	0644	edit dl rm
highuid.h	3194	0644	edit dl rm
hil.h	18857	0644	edit dl rm
hil_mlc.h	5249	0644	edit dl rm
hippidevice.h	1263	0644	edit dl rm
hmm.h	4656	0644	edit dl rm
host1x.h	8618	0644	edit dl rm
hpet.h	2615	0644	edit dl rm
hp_sdc.h	14352	0644	edit dl rm
hrtimer.h	16651	0644	edit dl rm
hrtimer_defs.h	660	0644	edit dl rm
htcpld.h	617	0644	edit dl rm
hugetlb.h	27496	0644	edit dl rm
hugetlb_cgroup.h	7056	0644	edit dl rm
hugetlb_inline.h	374	0644	edit dl rm
huge_mm.h	15743	0644	edit dl rm
hwmon-sysfs.h	2024	0644	edit dl rm
hwmon-vid.h	1518	0644	edit dl rm
hwmon.h	14084	0644	edit dl rm
hwspinlock.h	13044	0644	edit dl rm
hw_breakpoint.h	4405	0644	edit dl rm
hw_random.h	2377	0644	edit dl rm
hyperv.h	50010	0644	edit dl rm
hypervisor.h	748	0644	edit dl rm
i2c-algo-bit.h	2322	0644	edit dl rm
i2c-algo-pca.h	2599	0644	edit dl rm
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Edit: /usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/i2c.h (37874B)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * i2c.h - definitions for the Linux i2c bus interface
 * Copyright (C) 1995-2000 Simon G. Vogl
 * Copyright (C) 2013-2019 Wolfram Sang <wsa@the-dreams.de>
 *
 * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
 * Frodo Looijaard <frodol@dds.nl>
 */
#ifndef _LINUX_I2C_H
#define _LINUX_I2C_H

#include <linux/acpi.h>		/* for acpi_handle */
#include <linux/mod_devicetable.h>
#include <linux/device.h>	/* for struct device */
#include <linux/sched.h>	/* for completion */
#include <linux/mutex.h>
#include <linux/rtmutex.h>
#include <linux/irqdomain.h>		/* for Host Notify IRQ */
#include <linux/of.h>		/* for struct device_node */
#include <linux/swab.h>		/* for swab16 */
#include <uapi/linux/i2c.h>

extern struct bus_type i2c_bus_type;
extern struct device_type i2c_adapter_type;
extern struct device_type i2c_client_type;

/* --- General options ------------------------------------------------	*/

struct i2c_msg;
struct i2c_algorithm;
struct i2c_adapter;
struct i2c_client;
struct i2c_driver;
struct i2c_device_identity;
union i2c_smbus_data;
struct i2c_board_info;
enum i2c_slave_event;
typedef int (*i2c_slave_cb_t)(struct i2c_client *client,
			      enum i2c_slave_event event, u8 *val);

/* I2C Frequency Modes */
#define I2C_MAX_STANDARD_MODE_FREQ	100000
#define I2C_MAX_FAST_MODE_FREQ		400000
#define I2C_MAX_FAST_MODE_PLUS_FREQ	1000000
#define I2C_MAX_TURBO_MODE_FREQ		1400000
#define I2C_MAX_HIGH_SPEED_MODE_FREQ	3400000
#define I2C_MAX_ULTRA_FAST_MODE_FREQ	5000000

struct module;
struct property_entry;

#if IS_ENABLED(CONFIG_I2C)
/* Return the Frequency mode string based on the bus frequency */
const char *i2c_freq_mode_string(u32 bus_freq_hz);

/*
 * The master routines are the ones normally used to transmit data to devices
 * on a bus (or read from them). Apart from two basic transfer functions to
 * transmit one message at a time, a more complex version can be used to
 * transmit an arbitrary number of messages without interruption.
 * @count must be be less than 64k since msg.len is u16.
 */
int i2c_transfer_buffer_flags(const struct i2c_client *client,
			      char *buf, int count, u16 flags);

/**
 * i2c_master_recv - issue a single I2C message in master receive mode
 * @client: Handle to slave device
 * @buf: Where to store data read from slave
 * @count: How many bytes to read, must be less than 64k since msg.len is u16
 *
 * Returns negative errno, or else the number of bytes read.
 */
static inline int i2c_master_recv(const struct i2c_client *client,
				  char *buf, int count)
{
	return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD);
};

/**
 * i2c_master_recv_dmasafe - issue a single I2C message in master receive mode
 *			     using a DMA safe buffer
 * @client: Handle to slave device
 * @buf: Where to store data read from slave, must be safe to use with DMA
 * @count: How many bytes to read, must be less than 64k since msg.len is u16
 *
 * Returns negative errno, or else the number of bytes read.
 */
static inline int i2c_master_recv_dmasafe(const struct i2c_client *client,
					  char *buf, int count)
{
	return i2c_transfer_buffer_flags(client, buf, count,
					 I2C_M_RD | I2C_M_DMA_SAFE);
};

/**
 * i2c_master_send - issue a single I2C message in master transmit mode
 * @client: Handle to slave device
 * @buf: Data that will be written to the slave
 * @count: How many bytes to write, must be less than 64k since msg.len is u16
 *
 * Returns negative errno, or else the number of bytes written.
 */
static inline int i2c_master_send(const struct i2c_client *client,
				  const char *buf, int count)
{
	return i2c_transfer_buffer_flags(client, (char *)buf, count, 0);
};

/**
 * i2c_master_send_dmasafe - issue a single I2C message in master transmit mode
 *			     using a DMA safe buffer
 * @client: Handle to slave device
 * @buf: Data that will be written to the slave, must be safe to use with DMA
 * @count: How many bytes to write, must be less than 64k since msg.len is u16
 *
 * Returns negative errno, or else the number of bytes written.
 */
static inline int i2c_master_send_dmasafe(const struct i2c_client *client,
					  const char *buf, int count)
{
	return i2c_transfer_buffer_flags(client, (char *)buf, count,
					 I2C_M_DMA_SAFE);
};

/* Transfer num messages.
 */
int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
/* Unlocked flavor */
int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);

/* This is the very generalized SMBus access routine. You probably do not
   want to use this, though; one of the functions below may be much easier,
   and probably just as fast.
   Note that we use i2c_adapter here, because you do not need a specific
   smbus adapter to call this function. */
s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
		   unsigned short flags, char read_write, u8 command,
		   int protocol, union i2c_smbus_data *data);

/* Unlocked flavor */
s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
		     unsigned short flags, char read_write, u8 command,
		     int protocol, union i2c_smbus_data *data);

/* Now follow the 'nice' access routines. These also document the calling
   conventions of i2c_smbus_xfer. */

s32 i2c_smbus_read_byte(const struct i2c_client *client);
s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value);
s32 i2c_smbus_read_byte_data(const struct i2c_client *client, u8 command);
s32 i2c_smbus_write_byte_data(const struct i2c_client *client,
			      u8 command, u8 value);
s32 i2c_smbus_read_word_data(const struct i2c_client *client, u8 command);
s32 i2c_smbus_write_word_data(const struct i2c_client *client,
			      u8 command, u16 value);

static inline s32
i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command)
{
	s32 value = i2c_smbus_read_word_data(client, command);

return (value < 0) ? value : swab16(value);
}

static inline s32
i2c_smbus_write_word_swapped(const struct i2c_client *client,
			     u8 command, u16 value)
{
	return i2c_smbus_write_word_data(client, command, swab16(value));
}

/* Returns the number of read bytes */
s32 i2c_smbus_read_block_data(const struct i2c_client *client,
			      u8 command, u8 *values);
s32 i2c_smbus_write_block_data(const struct i2c_client *client,
			       u8 command, u8 length, const u8 *values);
/* Returns the number of read bytes */
s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client,
				  u8 command, u8 length, u8 *values);
s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
				   u8 command, u8 length, const u8 *values);
s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
					      u8 command, u8 length,
					      u8 *values);
int i2c_get_device_id(const struct i2c_client *client,
		      struct i2c_device_identity *id);
#endif /* I2C */

/**
 * struct i2c_device_identity - i2c client device identification
 * @manufacturer_id: 0 - 4095, database maintained by NXP
 * @part_id: 0 - 511, according to manufacturer
 * @die_revision: 0 - 7, according to manufacturer
 */
struct i2c_device_identity {
	u16 manufacturer_id;
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS                0
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_1              1
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_2              2
#define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_3              3
#define I2C_DEVICE_ID_RAMTRON_INTERNATIONAL             4
#define I2C_DEVICE_ID_ANALOG_DEVICES                    5
#define I2C_DEVICE_ID_STMICROELECTRONICS                6
#define I2C_DEVICE_ID_ON_SEMICONDUCTOR                  7
#define I2C_DEVICE_ID_SPRINTEK_CORPORATION              8
#define I2C_DEVICE_ID_ESPROS_PHOTONICS_AG               9
#define I2C_DEVICE_ID_FUJITSU_SEMICONDUCTOR            10
#define I2C_DEVICE_ID_FLIR                             11
#define I2C_DEVICE_ID_O2MICRO                          12
#define I2C_DEVICE_ID_ATMEL                            13
#define I2C_DEVICE_ID_NONE                         0xffff
	u16 part_id;
	u8 die_revision;
};

enum i2c_alert_protocol {
	I2C_PROTOCOL_SMBUS_ALERT,
	I2C_PROTOCOL_SMBUS_HOST_NOTIFY,
};

/**
 * struct i2c_driver - represent an I2C device driver
 * @class: What kind of i2c device we instantiate (for detect)
 * @probe: Callback for device binding - soon to be deprecated
 * @probe_new: New callback for device binding
 * @remove: Callback for device unbinding
 * @shutdown: Callback for device shutdown
 * @alert: Alert callback, for example for the SMBus alert protocol
 * @command: Callback for bus-wide signaling (optional)
 * @driver: Device driver model driver
 * @id_table: List of I2C devices supported by this driver
 * @detect: Callback for device detection
 * @address_list: The I2C addresses to probe (for detect)
 * @clients: List of detected clients we created (for i2c-core use only)
 * @disable_i2c_core_irq_mapping: Tell the i2c-core to not do irq-mapping
 *
 * The driver.owner field should be set to the module owner of this driver.
 * The driver.name field should be set to the name of this driver.
 *
 * For automatic device detection, both @detect and @address_list must
 * be defined. @class should also be set, otherwise only devices forced
 * with module parameters will be created. The detect function must
 * fill at least the name field of the i2c_board_info structure it is
 * handed upon successful detection, and possibly also the flags field.
 *
 * If @detect is missing, the driver will still work fine for enumerated
 * devices. Detected devices simply won't be supported. This is expected
 * for the many I2C/SMBus devices which can't be detected reliably, and
 * the ones which can always be enumerated in practice.
 *
 * The i2c_client structure which is handed to the @detect callback is
 * not a real i2c_client. It is initialized just enough so that you can
 * call i2c_smbus_read_byte_data and friends on it. Don't do anything
 * else with it. In particular, calling dev_dbg and friends on it is
 * not allowed.
 */
struct i2c_driver {
	unsigned int class;

/* Standard driver model interfaces */
	int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
	int (*remove)(struct i2c_client *client);

/* New driver model interface to aid the seamless removal of the
	 * current probe()'s, more commonly unused than used second parameter.
	 */
	int (*probe_new)(struct i2c_client *client);

/* driver model interfaces that don't relate to enumeration  */
	void (*shutdown)(struct i2c_client *client);

/* Alert callback, for example for the SMBus alert protocol.
	 * The format and meaning of the data value depends on the protocol.
	 * For the SMBus alert protocol, there is a single bit of data passed
	 * as the alert response's low bit ("event flag").
	 * For the SMBus Host Notify protocol, the data corresponds to the
	 * 16-bit payload data reported by the slave device acting as master.
	 */
	void (*alert)(struct i2c_client *client, enum i2c_alert_protocol protocol,
		      unsigned int data);

/* a ioctl like command that can be used to perform specific functions
	 * with the device.
	 */
	int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);

struct device_driver driver;
	const struct i2c_device_id *id_table;

/* Device detection callback for automatic device creation */
	int (*detect)(struct i2c_client *client, struct i2c_board_info *info);
	const unsigned short *address_list;
	struct list_head clients;

bool disable_i2c_core_irq_mapping;
};
#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)

/**
 * struct i2c_client - represent an I2C slave device
 * @flags: see I2C_CLIENT_* for possible flags
 * @addr: Address used on the I2C bus connected to the parent adapter.
 * @name: Indicates the type of the device, usually a chip name that's
 *	generic enough to hide second-sourcing and compatible revisions.
 * @adapter: manages the bus segment hosting this I2C device
 * @dev: Driver model device node for the slave.
 * @init_irq: IRQ that was set at initialization
 * @irq: indicates the IRQ generated by this device (if any)
 * @detected: member of an i2c_driver.clients list or i2c-core's
 *	userspace_devices list
 * @slave_cb: Callback when I2C slave mode of an adapter is used. The adapter
 *	calls it to pass on slave events to the slave driver.
 *
 * An i2c_client identifies a single device (i.e. chip) connected to an
 * i2c bus. The behaviour exposed to Linux is defined by the driver
 * managing the device.
 */
struct i2c_client {
	unsigned short flags;		/* div., see below		*/
#define I2C_CLIENT_PEC		0x04	/* Use Packet Error Checking */
#define I2C_CLIENT_TEN		0x10	/* we have a ten bit chip address */
					/* Must equal I2C_M_TEN below */
#define I2C_CLIENT_SLAVE	0x20	/* we are the slave */
#define I2C_CLIENT_HOST_NOTIFY	0x40	/* We want to use I2C host notify */
#define I2C_CLIENT_WAKE		0x80	/* for board_info; true iff can wake */
#define I2C_CLIENT_SCCB		0x9000	/* Use Omnivision SCCB protocol */
					/* Must match I2C_M_STOP|IGNORE_NAK */

unsigned short addr;		/* chip address - NOTE: 7bit	*/
					/* addresses are stored in the	*/
					/* _LOWER_ 7 bits		*/
	char name[I2C_NAME_SIZE];
	struct i2c_adapter *adapter;	/* the adapter we sit on	*/
	struct device dev;		/* the device structure		*/
	int init_irq;			/* irq set at initialization	*/
	int irq;			/* irq issued by device		*/
	struct list_head detected;
#if IS_ENABLED(CONFIG_I2C_SLAVE)
	i2c_slave_cb_t slave_cb;	/* callback for slave mode	*/
#endif
};
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)

struct i2c_client *i2c_verify_client(struct device *dev);
struct i2c_adapter *i2c_verify_adapter(struct device *dev);
const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
					 const struct i2c_client *client);

static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
{
	struct device * const dev = container_of(kobj, struct device, kobj);
	return to_i2c_client(dev);
}

static inline void *i2c_get_clientdata(const struct i2c_client *dev)
{
	return dev_get_drvdata(&dev->dev);
}

static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
{
	dev_set_drvdata(&dev->dev, data);
}

/* I2C slave support */

#if IS_ENABLED(CONFIG_I2C_SLAVE)
enum i2c_slave_event {
	I2C_SLAVE_READ_REQUESTED,
	I2C_SLAVE_WRITE_REQUESTED,
	I2C_SLAVE_READ_PROCESSED,
	I2C_SLAVE_WRITE_RECEIVED,
	I2C_SLAVE_STOP,
};

int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb);
int i2c_slave_unregister(struct i2c_client *client);
bool i2c_detect_slave_mode(struct device *dev);

static inline int i2c_slave_event(struct i2c_client *client,
				  enum i2c_slave_event event, u8 *val)
{
	return client->slave_cb(client, event, val);
}
#else
static inline bool i2c_detect_slave_mode(struct device *dev) { return false; }
#endif

/**
 * struct i2c_board_info - template for device creation
 * @type: chip type, to initialize i2c_client.name
 * @flags: to initialize i2c_client.flags
 * @addr: stored in i2c_client.addr
 * @dev_name: Overrides the default <busnr>-<addr> dev_name if set
 * @platform_data: stored in i2c_client.dev.platform_data
 * @of_node: pointer to OpenFirmware device node
 * @fwnode: device node supplied by the platform firmware
 * @swnode: software node for the device
 * @resources: resources associated with the device
 * @num_resources: number of resources in the @resources array
 * @irq: stored in i2c_client.irq
 *
 * I2C doesn't actually support hardware probing, although controllers and
 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
 * a device at a given address.  Drivers commonly need more information than
 * that, such as chip type, configuration, associated IRQ, and so on.
 *
 * i2c_board_info is used to build tables of information listing I2C devices
 * that are present.  This information is used to grow the driver model tree.
 * For mainboards this is done statically using i2c_register_board_info();
 * bus numbers identify adapters that aren't yet available.  For add-on boards,
 * i2c_new_device() does this dynamically with the adapter already known.
 */
struct i2c_board_info {
	char		type[I2C_NAME_SIZE];
	unsigned short	flags;
	unsigned short	addr;
	const char	*dev_name;
	void		*platform_data;
	struct device_node *of_node;
	struct fwnode_handle *fwnode;
	const struct software_node *swnode;
	const struct resource *resources;
	unsigned int	num_resources;
	int		irq;
};

/**
 * I2C_BOARD_INFO - macro used to list an i2c device and its address
 * @dev_type: identifies the device type
 * @dev_addr: the device's address on the bus.
 *
 * This macro initializes essential fields of a struct i2c_board_info,
 * declaring what has been provided on a particular board.  Optional
 * fields (such as associated irq, or device-specific platform_data)
 * are provided using conventional syntax.
 */
#define I2C_BOARD_INFO(dev_type, dev_addr) \
	.type = dev_type, .addr = (dev_addr)

#if IS_ENABLED(CONFIG_I2C)
/* Add-on boards should register/unregister their devices; e.g. a board
 * with integrated I2C, a config eeprom, sensors, and a codec that's
 * used in conjunction with the primary hardware.
 */
struct i2c_client *
i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);

struct i2c_client *
i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info);

/* If you don't know the exact address of an I2C device, use this variant
 * instead, which can probe for device presence in a list of possible
 * addresses. The "probe" callback function is optional. If it is provided,
 * it must return 1 on successful probe, 0 otherwise. If it is not provided,
 * a default probing method is used.
 */
struct i2c_client *
i2c_new_scanned_device(struct i2c_adapter *adap,
		       struct i2c_board_info *info,
		       unsigned short const *addr_list,
		       int (*probe)(struct i2c_adapter *adap, unsigned short addr));

struct i2c_client *
i2c_new_probed_device(struct i2c_adapter *adap,
		       struct i2c_board_info *info,
		       unsigned short const *addr_list,
		       int (*probe)(struct i2c_adapter *adap, unsigned short addr));

/* Common custom probe functions */
int i2c_probe_func_quick_read(struct i2c_adapter *adap, unsigned short addr);

struct i2c_client *
i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address);

struct i2c_client *
devm_i2c_new_dummy_device(struct device *dev, struct i2c_adapter *adap, u16 address);

struct i2c_client *
i2c_new_ancillary_device(struct i2c_client *client,
			 const char *name,
			 u16 default_addr);

void i2c_unregister_device(struct i2c_client *client);
#endif /* I2C */

/* Mainboard arch_initcall() code should register all its I2C devices.
 * This is done at arch_initcall time, before declaring any i2c adapters.
 * Modules for add-on boards must use other calls.
 */
#ifdef CONFIG_I2C_BOARDINFO
int
i2c_register_board_info(int busnum, struct i2c_board_info const *info,
			unsigned n);
#else
static inline int
i2c_register_board_info(int busnum, struct i2c_board_info const *info,
			unsigned n)
{
	return 0;
}
#endif /* I2C_BOARDINFO */

/**
 * struct i2c_algorithm - represent I2C transfer method
 * @master_xfer: Issue a set of i2c transactions to the given I2C adapter
 *   defined by the msgs array, with num messages available to transfer via
 *   the adapter specified by adap.
 * @master_xfer_atomic: same as @master_xfer. Yet, only using atomic context
 *   so e.g. PMICs can be accessed very late before shutdown. Optional.
 * @smbus_xfer: Issue smbus transactions to the given I2C adapter. If this
 *   is not present, then the bus layer will try and convert the SMBus calls
 *   into I2C transfers instead.
 * @smbus_xfer_atomic: same as @smbus_xfer. Yet, only using atomic context
 *   so e.g. PMICs can be accessed very late before shutdown. Optional.
 * @functionality: Return the flags that this algorithm/adapter pair supports
 *   from the ``I2C_FUNC_*`` flags.
 * @reg_slave: Register given client to I2C slave mode of this adapter
 * @unreg_slave: Unregister given client from I2C slave mode of this adapter
 *
 * The following structs are for those who like to implement new bus drivers:
 * i2c_algorithm is the interface to a class of hardware solutions which can
 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
 * to name two of the most common.
 *
 * The return codes from the ``master_xfer{_atomic}`` fields should indicate the
 * type of error code that occurred during the transfer, as documented in the
 * Kernel Documentation file Documentation/i2c/fault-codes.
 */
struct i2c_algorithm {
	/*
	 * If an adapter algorithm can't do I2C-level access, set master_xfer
	 * to NULL. If an adapter algorithm can do SMBus access, set
	 * smbus_xfer. If set to NULL, the SMBus protocol is simulated
	 * using common I2C messages.
	 *
	 * master_xfer should return the number of messages successfully
	 * processed, or a negative value on error
	 */
	int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
			   int num);
	int (*master_xfer_atomic)(struct i2c_adapter *adap,
				   struct i2c_msg *msgs, int num);
	int (*smbus_xfer)(struct i2c_adapter *adap, u16 addr,
			  unsigned short flags, char read_write,
			  u8 command, int size, union i2c_smbus_data *data);
	int (*smbus_xfer_atomic)(struct i2c_adapter *adap, u16 addr,
				 unsigned short flags, char read_write,
				 u8 command, int size, union i2c_smbus_data *data);

/* To determine what the adapter supports */
	u32 (*functionality)(struct i2c_adapter *adap);

#if IS_ENABLED(CONFIG_I2C_SLAVE)
	int (*reg_slave)(struct i2c_client *client);
	int (*unreg_slave)(struct i2c_client *client);
#endif
};

/**
 * struct i2c_lock_operations - represent I2C locking operations
 * @lock_bus: Get exclusive access to an I2C bus segment
 * @trylock_bus: Try to get exclusive access to an I2C bus segment
 * @unlock_bus: Release exclusive access to an I2C bus segment
 *
 * The main operations are wrapped by i2c_lock_bus and i2c_unlock_bus.
 */
struct i2c_lock_operations {
	void (*lock_bus)(struct i2c_adapter *adapter, unsigned int flags);
	int (*trylock_bus)(struct i2c_adapter *adapter, unsigned int flags);
	void (*unlock_bus)(struct i2c_adapter *adapter, unsigned int flags);
};

/**
 * struct i2c_timings - I2C timing information
 * @bus_freq_hz: the bus frequency in Hz
 * @scl_rise_ns: time SCL signal takes to rise in ns; t(r) in the I2C specification
 * @scl_fall_ns: time SCL signal takes to fall in ns; t(f) in the I2C specification
 * @scl_int_delay_ns: time IP core additionally needs to setup SCL in ns
 * @sda_fall_ns: time SDA signal takes to fall in ns; t(f) in the I2C specification
 * @sda_hold_ns: time IP core additionally needs to hold SDA in ns
 * @digital_filter_width_ns: width in ns of spikes on i2c lines that the IP core
 *	digital filter can filter out
 * @analog_filter_cutoff_freq_hz: threshold frequency for the low pass IP core
 *	analog filter
 */
struct i2c_timings {
	u32 bus_freq_hz;
	u32 scl_rise_ns;
	u32 scl_fall_ns;
	u32 scl_int_delay_ns;
	u32 sda_fall_ns;
	u32 sda_hold_ns;
	u32 digital_filter_width_ns;
	u32 analog_filter_cutoff_freq_hz;
};

/**
 * struct i2c_bus_recovery_info - I2C bus recovery information
 * @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
 *	i2c_generic_scl_recovery().
 * @get_scl: This gets current value of SCL line. Mandatory for generic SCL
 *      recovery. Populated internally for generic GPIO recovery.
 * @set_scl: This sets/clears the SCL line. Mandatory for generic SCL recovery.
 *      Populated internally for generic GPIO recovery.
 * @get_sda: This gets current value of SDA line. This or set_sda() is mandatory
 *	for generic SCL recovery. Populated internally, if sda_gpio is a valid
 *	GPIO, for generic GPIO recovery.
 * @set_sda: This sets/clears the SDA line. This or get_sda() is mandatory for
 *	generic SCL recovery. Populated internally, if sda_gpio is a valid GPIO,
 *	for generic GPIO recovery.
 * @get_bus_free: Returns the bus free state as seen from the IP core in case it
 *	has a more complex internal logic than just reading SDA. Optional.
 * @prepare_recovery: This will be called before starting recovery. Platform may
 *	configure padmux here for SDA/SCL line or something else they want.
 * @unprepare_recovery: This will be called after completing recovery. Platform
 *	may configure padmux here for SDA/SCL line or something else they want.
 * @scl_gpiod: gpiod of the SCL line. Only required for GPIO recovery.
 * @sda_gpiod: gpiod of the SDA line. Only required for GPIO recovery.
 */
struct i2c_bus_recovery_info {
	int (*recover_bus)(struct i2c_adapter *adap);

int (*get_scl)(struct i2c_adapter *adap);
	void (*set_scl)(struct i2c_adapter *adap, int val);
	int (*get_sda)(struct i2c_adapter *adap);
	void (*set_sda)(struct i2c_adapter *adap, int val);
	int (*get_bus_free)(struct i2c_adapter *adap);

void (*prepare_recovery)(struct i2c_adapter *adap);
	void (*unprepare_recovery)(struct i2c_adapter *adap);

/* gpio recovery */
	struct gpio_desc *scl_gpiod;
	struct gpio_desc *sda_gpiod;
};

int i2c_recover_bus(struct i2c_adapter *adap);

/* Generic recovery routines */
int i2c_generic_scl_recovery(struct i2c_adapter *adap);

/**
 * struct i2c_adapter_quirks - describe flaws of an i2c adapter
 * @flags: see I2C_AQ_* for possible flags and read below
 * @max_num_msgs: maximum number of messages per transfer
 * @max_write_len: maximum length of a write message
 * @max_read_len: maximum length of a read message
 * @max_comb_1st_msg_len: maximum length of the first msg in a combined message
 * @max_comb_2nd_msg_len: maximum length of the second msg in a combined message
 *
 * Note about combined messages: Some I2C controllers can only send one message
 * per transfer, plus something called combined message or write-then-read.
 * This is (usually) a small write message followed by a read message and
 * barely enough to access register based devices like EEPROMs. There is a flag
 * to support this mode. It implies max_num_msg = 2 and does the length checks
 * with max_comb_*_len because combined message mode usually has its own
 * limitations. Because of HW implementations, some controllers can actually do
 * write-then-anything or other variants. To support that, write-then-read has
 * been broken out into smaller bits like write-first and read-second which can
 * be combined as needed.
 */

struct i2c_adapter_quirks {
	u64 flags;
	int max_num_msgs;
	u16 max_write_len;
	u16 max_read_len;
	u16 max_comb_1st_msg_len;
	u16 max_comb_2nd_msg_len;
};

/* enforce max_num_msgs = 2 and use max_comb_*_len for length checks */
#define I2C_AQ_COMB			BIT(0)
/* first combined message must be write */
#define I2C_AQ_COMB_WRITE_FIRST		BIT(1)
/* second combined message must be read */
#define I2C_AQ_COMB_READ_SECOND		BIT(2)
/* both combined messages must have the same target address */
#define I2C_AQ_COMB_SAME_ADDR		BIT(3)
/* convenience macro for typical write-then read case */
#define I2C_AQ_COMB_WRITE_THEN_READ	(I2C_AQ_COMB | I2C_AQ_COMB_WRITE_FIRST | \
					 I2C_AQ_COMB_READ_SECOND | I2C_AQ_COMB_SAME_ADDR)
/* clock stretching is not supported */
#define I2C_AQ_NO_CLK_STRETCH		BIT(4)
/* message cannot have length of 0 */
#define I2C_AQ_NO_ZERO_LEN_READ		BIT(5)
#define I2C_AQ_NO_ZERO_LEN_WRITE	BIT(6)
#define I2C_AQ_NO_ZERO_LEN		(I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_NO_ZERO_LEN_WRITE)

/*
 * i2c_adapter is the structure used to identify a physical i2c bus along
 * with the access algorithms necessary to access it.
 */
struct i2c_adapter {
	struct module *owner;
	unsigned int class;		  /* classes to allow probing for */
	const struct i2c_algorithm *algo; /* the algorithm to access the bus */
	void *algo_data;

/* data fields that are valid for all devices	*/
	const struct i2c_lock_operations *lock_ops;
	struct rt_mutex bus_lock;
	struct rt_mutex mux_lock;

int timeout;			/* in jiffies */
	int retries;
	struct device dev;		/* the adapter device */
	unsigned long locked_flags;	/* owned by the I2C core */
#define I2C_ALF_IS_SUSPENDED		0
#define I2C_ALF_SUSPEND_REPORTED	1

int nr;
	char name[48];
	struct completion dev_released;

struct mutex userspace_clients_lock;
	struct list_head userspace_clients;

struct i2c_bus_recovery_info *bus_recovery_info;
	const struct i2c_adapter_quirks *quirks;

struct irq_domain *host_notify_domain;
};
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)

static inline void *i2c_get_adapdata(const struct i2c_adapter *adap)
{
	return dev_get_drvdata(&adap->dev);
}

static inline void i2c_set_adapdata(struct i2c_adapter *adap, void *data)
{
	dev_set_drvdata(&adap->dev, data);
}

static inline struct i2c_adapter *
i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)
{
#if IS_ENABLED(CONFIG_I2C_MUX)
	struct device *parent = adapter->dev.parent;

if (parent != NULL && parent->type == &i2c_adapter_type)
		return to_i2c_adapter(parent);
	else
#endif
		return NULL;
}

int i2c_for_each_dev(void *data, int (*fn)(struct device *dev, void *data));

/* Adapter locking functions, exported for shared pin cases */
#define I2C_LOCK_ROOT_ADAPTER BIT(0)
#define I2C_LOCK_SEGMENT      BIT(1)

/**
 * i2c_lock_bus - Get exclusive access to an I2C bus segment
 * @adapter: Target I2C bus segment
 * @flags: I2C_LOCK_ROOT_ADAPTER locks the root i2c adapter, I2C_LOCK_SEGMENT
 *	locks only this branch in the adapter tree
 */
static inline void
i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags)
{
	adapter->lock_ops->lock_bus(adapter, flags);
}

/**
 * i2c_trylock_bus - Try to get exclusive access to an I2C bus segment
 * @adapter: Target I2C bus segment
 * @flags: I2C_LOCK_ROOT_ADAPTER tries to locks the root i2c adapter,
 *	I2C_LOCK_SEGMENT tries to lock only this branch in the adapter tree
 *
 * Return: true if the I2C bus segment is locked, false otherwise
 */
static inline int
i2c_trylock_bus(struct i2c_adapter *adapter, unsigned int flags)
{
	return adapter->lock_ops->trylock_bus(adapter, flags);
}

/**
 * i2c_unlock_bus - Release exclusive access to an I2C bus segment
 * @adapter: Target I2C bus segment
 * @flags: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, I2C_LOCK_SEGMENT
 *	unlocks only this branch in the adapter tree
 */
static inline void
i2c_unlock_bus(struct i2c_adapter *adapter, unsigned int flags)
{
	adapter->lock_ops->unlock_bus(adapter, flags);
}

/**
 * i2c_mark_adapter_suspended - Report suspended state of the adapter to the core
 * @adap: Adapter to mark as suspended
 *
 * When using this helper to mark an adapter as suspended, the core will reject
 * further transfers to this adapter. The usage of this helper is optional but
 * recommended for devices having distinct handlers for system suspend and
 * runtime suspend. More complex devices are free to implement custom solutions
 * to reject transfers when suspended.
 */
static inline void i2c_mark_adapter_suspended(struct i2c_adapter *adap)
{
	i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
	set_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
	i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
}

/**
 * i2c_mark_adapter_resumed - Report resumed state of the adapter to the core
 * @adap: Adapter to mark as resumed
 *
 * When using this helper to mark an adapter as resumed, the core will allow
 * further transfers to this adapter. See also further notes to
 * @i2c_mark_adapter_suspended().
 */
static inline void i2c_mark_adapter_resumed(struct i2c_adapter *adap)
{
	i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
	clear_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
	i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
}

/* i2c adapter classes (bitmask) */
#define I2C_CLASS_HWMON		(1<<0)	/* lm_sensors, ... */
#define I2C_CLASS_DDC		(1<<3)	/* DDC bus on graphics adapters */
#define I2C_CLASS_SPD		(1<<7)	/* Memory modules */
/* Warn users that the adapter doesn't support classes anymore */
#define I2C_CLASS_DEPRECATED	(1<<8)

/* Internal numbers to terminate lists */
#define I2C_CLIENT_END		0xfffeU

/* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
#define I2C_ADDRS(addr, addrs...) \
	((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })

/* ----- functions exported by i2c.o */

/* administration...
 */
#if IS_ENABLED(CONFIG_I2C)
int i2c_add_adapter(struct i2c_adapter *adap);
void i2c_del_adapter(struct i2c_adapter *adap);
int i2c_add_numbered_adapter(struct i2c_adapter *adap);

int i2c_register_driver(struct module *owner, struct i2c_driver *driver);
void i2c_del_driver(struct i2c_driver *driver);

/* use a define to avoid include chaining to get THIS_MODULE */
#define i2c_add_driver(driver) \
	i2c_register_driver(THIS_MODULE, driver)

static inline bool i2c_client_has_driver(struct i2c_client *client)
{
	return !IS_ERR_OR_NULL(client) && client->dev.driver;
}

/* call the i2c_client->command() of all attached clients with
 * the given arguments */
void i2c_clients_command(struct i2c_adapter *adap,
			 unsigned int cmd, void *arg);

struct i2c_adapter *i2c_get_adapter(int nr);
void i2c_put_adapter(struct i2c_adapter *adap);
unsigned int i2c_adapter_depth(struct i2c_adapter *adapter);

void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults);

/* Return the functionality mask */
static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
{
	return adap->algo->functionality(adap);
}

/* Return 1 if adapter supports everything we need, 0 if not. */
static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
{
	return (func & i2c_get_functionality(adap)) == func;
}

/**
 * i2c_check_quirks() - Function for checking the quirk flags in an i2c adapter
 * @adap: i2c adapter
 * @quirks: quirk flags
 *
 * Return: true if the adapter has all the specified quirk flags, false if not
 */
static inline bool i2c_check_quirks(struct i2c_adapter *adap, u64 quirks)
{
	if (!adap->quirks)
		return false;
	return (adap->quirks->flags & quirks) == quirks;
}

/* Return the adapter number for a specific adapter */
static inline int i2c_adapter_id(struct i2c_adapter *adap)
{
	return adap->nr;
}

static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg)
{
	return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0);
}

u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold);
void i2c_put_dma_safe_msg_buf(u8 *buf, struct i2c_msg *msg, bool xferred);

int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr);
/**
 * module_i2c_driver() - Helper macro for registering a modular I2C driver
 * @__i2c_driver: i2c_driver struct
 *
 * Helper macro for I2C drivers which do not do anything special in module
 * init/exit. This eliminates a lot of boilerplate. Each module may only
 * use this macro once, and calling it replaces module_init() and module_exit()
 */
#define module_i2c_driver(__i2c_driver) \
	module_driver(__i2c_driver, i2c_add_driver, \
			i2c_del_driver)

/**
 * builtin_i2c_driver() - Helper macro for registering a builtin I2C driver
 * @__i2c_driver: i2c_driver struct
 *
 * Helper macro for I2C drivers which do not do anything special in their
 * init. This eliminates a lot of boilerplate. Each driver may only
 * use this macro once, and calling it replaces device_initcall().
 */
#define builtin_i2c_driver(__i2c_driver) \
	builtin_driver(__i2c_driver, i2c_add_driver)

#endif /* I2C */

#if IS_ENABLED(CONFIG_OF)
/* must call put_device() when done with returned i2c_client device */
struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);

/* must call put_device() when done with returned i2c_adapter device */
struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node);

/* must call i2c_put_adapter() when done with returned i2c_adapter device */
struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node);

const struct of_device_id
*i2c_of_match_device(const struct of_device_id *matches,
		     struct i2c_client *client);

int of_i2c_get_board_info(struct device *dev, struct device_node *node,
			  struct i2c_board_info *info);

#else

static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
{
	return NULL;
}

static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
{
	return NULL;
}

static inline struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node)
{
	return NULL;
}

static inline const struct of_device_id
*i2c_of_match_device(const struct of_device_id *matches,
		     struct i2c_client *client)
{
	return NULL;
}

static inline int of_i2c_get_board_info(struct device *dev,
					struct device_node *node,
					struct i2c_board_info *info)
{
	return -ENOTSUPP;
}

#endif /* CONFIG_OF */

struct acpi_resource;
struct acpi_resource_i2c_serialbus;

#if IS_ENABLED(CONFIG_ACPI)
bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
			       struct acpi_resource_i2c_serialbus **i2c);
int i2c_acpi_client_count(struct acpi_device *adev);
u32 i2c_acpi_find_bus_speed(struct device *dev);
struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
				       struct i2c_board_info *info);
struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle);
#else
static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
					     struct acpi_resource_i2c_serialbus **i2c)
{
	return false;
}
static inline int i2c_acpi_client_count(struct acpi_device *adev)
{
	return 0;
}
static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
{
	return 0;
}
static inline struct i2c_client *i2c_acpi_new_device(struct device *dev,
					int index, struct i2c_board_info *info)
{
	return NULL;
}
static inline struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
{
	return NULL;
}
#endif /* CONFIG_ACPI */

#endif /* _LINUX_I2C_H */

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