Commit | Line | Data |
---|---|---|
c942fddf | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
9c1600ed DB |
2 | /* |
3 | * i2c-core.h - interfaces internal to the I2C framework | |
9c1600ed DB |
4 | */ |
5 | ||
a3368e11 | 6 | #include <linux/kconfig.h> |
f18c41da RG |
7 | #include <linux/rwsem.h> |
8 | ||
9c1600ed DB |
9 | struct i2c_devinfo { |
10 | struct list_head list; | |
11 | int busnum; | |
12 | struct i2c_board_info board_info; | |
13 | }; | |
14 | ||
15 | /* board_lock protects board_list and first_dynamic_bus_num. | |
16 | * only i2c core components are allowed to use these symbols. | |
17 | */ | |
f18c41da | 18 | extern struct rw_semaphore __i2c_board_lock; |
9c1600ed DB |
19 | extern struct list_head __i2c_board_list; |
20 | extern int __i2c_first_dynamic_bus_num; | |
21 | ||
e4991ecd | 22 | int i2c_check_7bit_addr_validity_strict(unsigned short addr); |
1d7534b6 CK |
23 | int i2c_dev_irq_from_resources(const struct resource *resources, |
24 | unsigned int num_resources); | |
5bf4fa7d | 25 | |
bae1d3a0 | 26 | /* |
df7b4d6f WS |
27 | * We only allow atomic transfers for very late communication, e.g. to access a |
28 | * PMIC when powering down. Atomic transfers are a corner case and not for | |
29 | * generic use! | |
bae1d3a0 WS |
30 | */ |
31 | static inline bool i2c_in_atomic_xfer_mode(void) | |
32 | { | |
a3368e11 BB |
33 | return system_state > SYSTEM_RUNNING && |
34 | (IS_ENABLED(CONFIG_PREEMPT_COUNT) ? !preemptible() : irqs_disabled()); | |
bae1d3a0 WS |
35 | } |
36 | ||
83c42212 WS |
37 | static inline int __i2c_lock_bus_helper(struct i2c_adapter *adap) |
38 | { | |
39 | int ret = 0; | |
40 | ||
63b96983 WS |
41 | if (i2c_in_atomic_xfer_mode()) { |
42 | WARN(!adap->algo->master_xfer_atomic && !adap->algo->smbus_xfer_atomic, | |
43 | "No atomic I2C transfer handler for '%s'\n", dev_name(&adap->dev)); | |
83c42212 | 44 | ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT) ? 0 : -EAGAIN; |
63b96983 | 45 | } else { |
83c42212 | 46 | i2c_lock_bus(adap, I2C_LOCK_SEGMENT); |
63b96983 | 47 | } |
83c42212 WS |
48 | |
49 | return ret; | |
50 | } | |
51 | ||
5d756112 WS |
52 | static inline int __i2c_check_suspended(struct i2c_adapter *adap) |
53 | { | |
54 | if (test_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags)) { | |
55 | if (!test_and_set_bit(I2C_ALF_SUSPEND_REPORTED, &adap->locked_flags)) | |
56 | dev_WARN(&adap->dev, "Transfer while suspended\n"); | |
57 | return -ESHUTDOWN; | |
58 | } | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
53f8f7c5 WS |
63 | #ifdef CONFIG_ACPI |
64 | void i2c_acpi_register_devices(struct i2c_adapter *adap); | |
16c9db1d | 65 | |
b38f2d5d | 66 | int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable); |
53f8f7c5 WS |
67 | #else /* CONFIG_ACPI */ |
68 | static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { } | |
16c9db1d | 69 | |
b38f2d5d | 70 | static inline int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable) |
16c9db1d CK |
71 | { |
72 | return 0; | |
73 | } | |
53f8f7c5 WS |
74 | #endif /* CONFIG_ACPI */ |
75 | extern struct notifier_block i2c_acpi_notifier; | |
76 | ||
77 | #ifdef CONFIG_ACPI_I2C_OPREGION | |
78 | int i2c_acpi_install_space_handler(struct i2c_adapter *adapter); | |
79 | void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter); | |
80 | #else /* CONFIG_ACPI_I2C_OPREGION */ | |
81 | static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) { return 0; } | |
82 | static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) { } | |
83 | #endif /* CONFIG_ACPI_I2C_OPREGION */ | |
84 | ||
5bf4fa7d WS |
85 | #ifdef CONFIG_OF |
86 | void of_i2c_register_devices(struct i2c_adapter *adap); | |
87 | #else | |
88 | static inline void of_i2c_register_devices(struct i2c_adapter *adap) { } | |
89 | #endif | |
90 | extern struct notifier_block i2c_of_notifier; | |
48115399 WS |
91 | |
92 | #if IS_ENABLED(CONFIG_I2C_SMBUS) | |
93 | int i2c_setup_smbus_alert(struct i2c_adapter *adap); | |
94 | #else | |
95 | static inline int i2c_setup_smbus_alert(struct i2c_adapter *adap) | |
96 | { | |
97 | return 0; | |
98 | } | |
99 | #endif |