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b38f2d5d96
Device tree already has a mechanism to pass the wake_irq. It does this by looking for the wakeup-source property and setting the I2C_CLIENT_WAKE flag. This CL adds the ACPI equivalent. It uses the ACPI interrupt wake flag to determine if the interrupt can be used to wake the system. Previously the i2c drivers had to make assumptions and blindly enable the wake IRQ. This can cause spurious wake events. e.g., If there is a device with an Active Low interrupt and the device gets powered off while suspending, the interrupt line will go low since it's no longer powered and wakes the system. For this reason we should respect the board designers wishes and honor the wake bit defined on the interrupt. Signed-off-by: Raul E Rangel <rrangel@chromium.org> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* 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, bool *wake_capable);
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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, bool *wake_capable)
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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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#if IS_ENABLED(CONFIG_I2C_SMBUS)
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int i2c_setup_smbus_alert(struct i2c_adapter *adap);
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#else
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static inline int i2c_setup_smbus_alert(struct i2c_adapter *adap)
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{
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return 0;
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}
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#endif
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