/drivers/i2c/i2c-core.h
http://github.com/mirrors/linux · C Header · 97 lines · 70 code · 15 blank · 12 comment · 6 complexity · 5f67962fd00f183aeae412703d8af78b MD5 · raw file
- /* SPDX-License-Identifier: GPL-2.0-or-later */
- /*
- * i2c-core.h - interfaces internal to the I2C framework
- */
- #include <linux/rwsem.h>
- struct i2c_devinfo {
- struct list_head list;
- int busnum;
- struct i2c_board_info board_info;
- };
- /* board_lock protects board_list and first_dynamic_bus_num.
- * only i2c core components are allowed to use these symbols.
- */
- extern struct rw_semaphore __i2c_board_lock;
- extern struct list_head __i2c_board_list;
- extern int __i2c_first_dynamic_bus_num;
- int i2c_check_7bit_addr_validity_strict(unsigned short addr);
- int i2c_dev_irq_from_resources(const struct resource *resources,
- unsigned int num_resources);
- /*
- * We only allow atomic transfers for very late communication, e.g. to send
- * the powerdown command to a PMIC. Atomic transfers are a corner case and not
- * for generic use!
- */
- static inline bool i2c_in_atomic_xfer_mode(void)
- {
- return system_state > SYSTEM_RUNNING && irqs_disabled();
- }
- static inline int __i2c_lock_bus_helper(struct i2c_adapter *adap)
- {
- int ret = 0;
- if (i2c_in_atomic_xfer_mode()) {
- WARN(!adap->algo->master_xfer_atomic && !adap->algo->smbus_xfer_atomic,
- "No atomic I2C transfer handler for '%s'\n", dev_name(&adap->dev));
- ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT) ? 0 : -EAGAIN;
- } else {
- i2c_lock_bus(adap, I2C_LOCK_SEGMENT);
- }
- return ret;
- }
- static inline int __i2c_check_suspended(struct i2c_adapter *adap)
- {
- if (test_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags)) {
- if (!test_and_set_bit(I2C_ALF_SUSPEND_REPORTED, &adap->locked_flags))
- dev_WARN(&adap->dev, "Transfer while suspended\n");
- return -ESHUTDOWN;
- }
- return 0;
- }
- #ifdef CONFIG_ACPI
- const struct acpi_device_id *
- i2c_acpi_match_device(const struct acpi_device_id *matches,
- struct i2c_client *client);
- void i2c_acpi_register_devices(struct i2c_adapter *adap);
- int i2c_acpi_get_irq(struct i2c_client *client);
- #else /* CONFIG_ACPI */
- static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
- static inline const struct acpi_device_id *
- i2c_acpi_match_device(const struct acpi_device_id *matches,
- struct i2c_client *client)
- {
- return NULL;
- }
- static inline int i2c_acpi_get_irq(struct i2c_client *client)
- {
- return 0;
- }
- #endif /* CONFIG_ACPI */
- extern struct notifier_block i2c_acpi_notifier;
- #ifdef CONFIG_ACPI_I2C_OPREGION
- int i2c_acpi_install_space_handler(struct i2c_adapter *adapter);
- void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter);
- #else /* CONFIG_ACPI_I2C_OPREGION */
- static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) { return 0; }
- static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) { }
- #endif /* CONFIG_ACPI_I2C_OPREGION */
- #ifdef CONFIG_OF
- void of_i2c_register_devices(struct i2c_adapter *adap);
- #else
- static inline void of_i2c_register_devices(struct i2c_adapter *adap) { }
- #endif
- extern struct notifier_block i2c_of_notifier;