diff options
Diffstat (limited to 'drivers/i2c/i2c-core.h')
| -rw-r--r-- | drivers/i2c/i2c-core.h | 81 |
1 files changed, 64 insertions, 17 deletions
diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h index 37576f50fe20..4797ba88331c 100644 --- a/drivers/i2c/i2c-core.h +++ b/drivers/i2c/i2c-core.h @@ -1,17 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * 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/kconfig.h> #include <linux/rwsem.h> struct i2c_devinfo { @@ -28,19 +20,56 @@ 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 && + (IS_ENABLED(CONFIG_PREEMPT_COUNT) ? !preemptible() : 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, bool *wake_capable); #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) + +static inline int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable) { - return NULL; + return 0; } #endif /* CONFIG_ACPI */ extern struct notifier_block i2c_acpi_notifier; @@ -55,7 +84,25 @@ static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) { #ifdef CONFIG_OF void of_i2c_register_devices(struct i2c_adapter *adap); +const struct of_device_id *i2c_of_match_device(const struct of_device_id *matches, + struct i2c_client *client); + #else static inline void of_i2c_register_devices(struct i2c_adapter *adap) { } +static inline +const struct of_device_id *i2c_of_match_device(const struct of_device_id *matches, + struct i2c_client *client) +{ + return NULL; +} #endif extern struct notifier_block i2c_of_notifier; + +#if IS_ENABLED(CONFIG_I2C_SMBUS) +int i2c_setup_smbus_alert(struct i2c_adapter *adap); +#else +static inline int i2c_setup_smbus_alert(struct i2c_adapter *adap) +{ + return 0; +} +#endif |