mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-12 13:26:42 +07:00
df7b4d6f7d
Atomic transfers are not only about sending messages like the original wording suggested. Speak of 'accessing' now like in i2c.h. Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* 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;
|