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