diff options
Diffstat (limited to 'drivers/i2c/i2c-core.c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 74 |
1 files changed, 15 insertions, 59 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 347494a8750e..abe41369eec1 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -105,13 +105,11 @@ struct gsb_buffer { struct i2c_acpi_lookup { struct i2c_board_info *info; - struct i2c_adapter *adapter; /* set only when registering slaves */ acpi_handle adapter_handle; acpi_handle device_handle; - u32 min_speed; }; -static int i2c_acpi_find_resource(struct acpi_resource *ares, void *data) +static int i2c_acpi_find_address(struct acpi_resource *ares, void *data) { struct i2c_acpi_lookup *lookup = data; struct i2c_board_info *info = lookup->info; @@ -137,20 +135,17 @@ static int i2c_acpi_find_resource(struct acpi_resource *ares, void *data) info->addr = sb->slave_address; if (sb->access_mode == ACPI_I2C_10BIT_MODE) info->flags |= I2C_CLIENT_TEN; - /* Save speed of the slowest device */ - if (sb->connection_speed < lookup->min_speed) - lookup->min_speed = sb->connection_speed; } return 1; } -static acpi_status i2c_acpi_slave_lookup(acpi_handle handle, u32 level, - void *data, void **return_value) +static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, + void *data, void **return_value) { - struct i2c_acpi_lookup *lookup = data; - struct i2c_adapter *adapter = lookup->adapter; + struct i2c_adapter *adapter = data; struct list_head resource_list; + struct i2c_acpi_lookup lookup; struct resource_entry *entry; struct i2c_board_info info; struct acpi_device *adev; @@ -164,8 +159,10 @@ static acpi_status i2c_acpi_slave_lookup(acpi_handle handle, u32 level, memset(&info, 0, sizeof(info)); info.fwnode = acpi_fwnode_handle(adev); - lookup->device_handle = handle; - lookup->info = &info; + memset(&lookup, 0, sizeof(lookup)); + lookup.adapter_handle = ACPI_HANDLE(&adapter->dev); + lookup.device_handle = handle; + lookup.info = &info; /* * Look up for I2cSerialBus resource with ResourceSource that @@ -173,10 +170,10 @@ static acpi_status i2c_acpi_slave_lookup(acpi_handle handle, u32 level, */ INIT_LIST_HEAD(&resource_list); ret = acpi_dev_get_resources(adev, &resource_list, - i2c_acpi_find_resource, lookup); + i2c_acpi_find_address, &lookup); acpi_dev_free_resource_list(&resource_list); - if (ret < 0 || !info.addr || !lookup->adapter) + if (ret < 0 || !info.addr) return AE_OK; /* Then fill IRQ number if any */ @@ -207,14 +204,6 @@ static acpi_status i2c_acpi_slave_lookup(acpi_handle handle, u32 level, #define I2C_ACPI_MAX_SCAN_DEPTH 32 -static acpi_status i2c_acpi_walk(struct i2c_acpi_lookup *lookup) -{ - return acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, - I2C_ACPI_MAX_SCAN_DEPTH, - i2c_acpi_slave_lookup, NULL, - lookup, NULL); -} - /** * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter * @adap: pointer to adapter @@ -225,52 +214,19 @@ static acpi_status i2c_acpi_walk(struct i2c_acpi_lookup *lookup) */ static void i2c_acpi_register_devices(struct i2c_adapter *adap) { - struct i2c_acpi_lookup lookup; acpi_status status; if (!has_acpi_companion(&adap->dev)) return; - memset(&lookup, 0, sizeof(lookup)); - lookup.adapter = adap; - lookup.adapter_handle = ACPI_HANDLE(&adap->dev); - - status = i2c_acpi_walk(&lookup); + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + I2C_ACPI_MAX_SCAN_DEPTH, + i2c_acpi_add_device, NULL, + adap, NULL); if (ACPI_FAILURE(status)) dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); } -/** - * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI - * @dev: The device owning the bus - * - * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves - * devices connected to this bus and use the speed of slowest device. - * - * Returns the speed in Hz or zero - */ -u32 i2c_acpi_find_bus_speed(struct device *dev) -{ - struct i2c_acpi_lookup lookup; - acpi_status status; - - if (!has_acpi_companion(dev)) - return 0; - - memset(&lookup, 0, sizeof(lookup)); - lookup.adapter_handle = ACPI_HANDLE(dev); - lookup.min_speed = UINT_MAX; - - status = i2c_acpi_walk(&lookup); - if (ACPI_FAILURE(status)) { - dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); - return 0; - } - - return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0; -} -EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); - #else /* CONFIG_ACPI */ static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { } #endif /* CONFIG_ACPI */ |