blob: 517d98be68d253b9421bf448ddb35762436a6656 [file] [log] [blame]
/* 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 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()) {
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;
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;
int i2c_acpi_install_space_handler(struct i2c_adapter *adapter);
void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter);
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) { }
#ifdef CONFIG_OF
void of_i2c_register_devices(struct i2c_adapter *adap);
static inline void of_i2c_register_devices(struct i2c_adapter *adap) { }
extern struct notifier_block i2c_of_notifier;