drivers/gpio/gpio-pca953x.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-pca953x.c

Extension

.c

Size

44371 bytes

Lines

1516

Domain

Driver Families

Bucket

drivers/gpio

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/atomic.h
• linux/bitmap.h
• linux/cleanup.h
• linux/device.h
• linux/errno.h
• linux/i2c.h
• linux/init.h
• linux/interrupt.h
• linux/irq.h
• linux/mod_devicetable.h
• linux/module.h
• linux/mutex.h
• linux/pm.h
• linux/regmap.h
• linux/regulator/consumer.h
• linux/seq_file.h
• linux/slab.h
• linux/gpio/consumer.h
• linux/gpio/driver.h
• linux/pinctrl/pinconf-generic.h
• linux/platform_data/pca953x.h
• linux/acpi.h
• linux/dmi.h

Detected Declarations

• struct pca953x_reg_config
• struct pca953x_chip
• function pca953x_acpi_get_irq
• function pca953x_bank_shift
• function pca953x_get_bit_mask
• function pca953x_check_register
• function pcal6534_check_register
• function tca6418_check_register
• function pca953x_readable_register
• function pca953x_writeable_register
• function pca953x_volatile_register
• function pca953x_recalc_addr
• function pcal6534_recalc_addr
• function tca6418_recalc_addr
• function pca953x_write_regs
• function pca953x_read_regs
• function pca953x_gpio_direction_input
• function pca953x_gpio_direction_output
• function pca953x_gpio_get_value
• function pca953x_gpio_set_value
• function pca953x_gpio_get_direction
• function pca953x_gpio_get_multiple
• function pca953x_gpio_set_multiple
• function pca953x_gpio_set_pull_up_down
• function pca953x_gpio_set_config
• function pca953x_setup_gpio
• function pca953x_irq_mask
• function pca953x_irq_unmask
• function pca953x_irq_set_wake
• function pca953x_irq_bus_lock
• function pca953x_irq_bus_sync_unlock
• function pca953x_irq_set_type
• function pca953x_irq_shutdown
• function pca953x_irq_print_chip
• function pca953x_irq_pending
• function pca953x_irq_handler
• function for_each_set_bit
• function pca953x_irq_setup
• function pca953x_irq_setup
• function device_pca95xx_init
• function device_pca957x_init
• function pca953x_disable_regulator
• function pca953x_get_and_enable_regulator
• function pca953x_probe
• function pca953x_regcache_sync
• function pca953x_restore_context
• function pca953x_save_context
• function pca953x_suspend

Annotated Snippet

subsys_initcall(pca953x_init);

static void __exit pca953x_exit(void)
{
	i2c_del_driver(&pca953x_driver);
}
module_exit(pca953x_exit);

MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/atomic.h`, `linux/bitmap.h`, `linux/cleanup.h`, `linux/device.h`, `linux/errno.h`, `linux/i2c.h`, `linux/init.h`, `linux/interrupt.h`.
• Detected declarations: `struct pca953x_reg_config`, `struct pca953x_chip`, `function pca953x_acpi_get_irq`, `function pca953x_bank_shift`, `function pca953x_get_bit_mask`, `function pca953x_check_register`, `function pcal6534_check_register`, `function tca6418_check_register`, `function pca953x_readable_register`, `function pca953x_writeable_register`.
• Atlas domain: Driver Families / drivers/gpio.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.