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linux
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drivers
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i2c
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i2c-core.h
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83 lines (72 loc) · 2.63 KB
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linux
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i2c-core.h
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/* * i2c-core.h - interfaces internal to the I2C framework * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #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); /* * 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()) ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT) ? 0 : -EAGAIN; else i2c_lock_bus(adap, I2C_LOCK_SEGMENT); return ret; } #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); #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; } #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;
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