| /* 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 access a |
| * PMIC when powering down. 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; |