On Mon, 2015-10-12 at 13:46 +0300, Mika Westerberg wrote: > On Fri, Oct 09, 2015 at 05:41:46PM -0700, Dustin Byford wrote: > > An I2cSerialBus connection resource descriptor may indicate a > > ResourceSource (a string uniquely identifying the I2C bus > > controller) > > anywhere in the ACPI namespace. However, when enumerating > > connections to a > > I2C bus controller, i2c-core.c:acpi_i2c_register_devices() as only > > searching devices that are descendants of the bus controller. > > > > This change corrects acpi_i2c_register_devices() to walk the entire > > ACPI > > namespace searching for I2C connections. > > > > Suggested-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> > > Signed-off-by: Dustin Byford <dustin@xxxxxxxxxxxxxxxxxxx> > > This patch is already included in Andy's latest series adding support > for Intel Galileo here: > > https://patchwork.ozlabs.org/patch/527231/ > > Maybe we can add your Tested-by/Reviewed-by to that patch instead? Indeed, the Tested-by tag would be much appreciated! > > > --- > > drivers/i2c/i2c-core.c | 82 ++++++++++++++++++++++++++++++++++++-- > > ------------ > > 1 file changed, 59 insertions(+), 23 deletions(-) > > > > diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c > > index 5f89f1e..3a4c54e 100644 > > --- a/drivers/i2c/i2c-core.c > > +++ b/drivers/i2c/i2c-core.c > > @@ -99,27 +99,40 @@ struct gsb_buffer { > > }; > > } __packed; > > > > -static int acpi_i2c_add_resource(struct acpi_resource *ares, void > > *data) > > +struct acpi_i2c_lookup { > > + struct i2c_board_info *info; > > + acpi_handle adapter_handle; > > + acpi_handle device_handle; > > +}; > > + > > +static int acpi_i2c_find_address(struct acpi_resource *ares, void > > *data) > > { > > - struct i2c_board_info *info = data; > > + struct acpi_i2c_lookup *lookup = data; > > + struct i2c_board_info *info = lookup->info; > > + struct acpi_resource_i2c_serialbus *sb; > > + acpi_handle adapter_handle; > > + acpi_status status; > > > > - if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { > > - struct acpi_resource_i2c_serialbus *sb; > > + if (info->addr || ares->type != > > ACPI_RESOURCE_TYPE_SERIAL_BUS) > > + return 1; > > > > - sb = &ares->data.i2c_serial_bus; > > - if (!info->addr && sb->type == > > ACPI_RESOURCE_SERIAL_TYPE_I2C) { > > - info->addr = sb->slave_address; > > - if (sb->access_mode == > > ACPI_I2C_10BIT_MODE) > > - info->flags |= I2C_CLIENT_TEN; > > - } > > - } else if (!info->irq) { > > - struct resource r; > > + sb = &ares->data.i2c_serial_bus; > > + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) > > + return 1; > > > > - if (acpi_dev_resource_interrupt(ares, 0, &r)) > > - info->irq = r.start; > > + /* > > + * Extract the ResourceSource and make sure that the > > handle matches > > + * with the I2C adapter handle. > > + */ > > + status = acpi_get_handle(lookup->device_handle, > > + sb->resource_source.string_ptr, > > + &adapter_handle); > > + if (ACPI_SUCCESS(status) && adapter_handle == lookup > > ->adapter_handle) { > > + info->addr = sb->slave_address; > > + if (sb->access_mode == ACPI_I2C_10BIT_MODE) > > + info->flags |= I2C_CLIENT_TEN; > > } > > > > - /* Tell the ACPI core to skip this resource */ > > return 1; > > } > > > > @@ -128,6 +141,8 @@ static acpi_status > > acpi_i2c_add_device(acpi_handle handle, u32 level, > > { > > struct i2c_adapter *adapter = data; > > struct list_head resource_list; > > + struct acpi_i2c_lookup lookup; > > + struct resource_entry *entry; > > struct i2c_board_info info; > > struct acpi_device *adev; > > int ret; > > @@ -140,14 +155,37 @@ static acpi_status > > acpi_i2c_add_device(acpi_handle handle, u32 level, > > memset(&info, 0, sizeof(info)); > > info.fwnode = acpi_fwnode_handle(adev); > > > > + memset(&lookup, 0, sizeof(lookup)); > > + lookup.adapter_handle = ACPI_HANDLE(adapter->dev.parent); > > + lookup.device_handle = handle; > > + lookup.info = &info; > > + > > + /* > > + * Look up for I2cSerialBus resource with ResourceSource > > that > > + * matches with this adapter. > > + */ > > INIT_LIST_HEAD(&resource_list); > > ret = acpi_dev_get_resources(adev, &resource_list, > > - acpi_i2c_add_resource, > > &info); > > + acpi_i2c_find_address, > > &lookup); > > acpi_dev_free_resource_list(&resource_list); > > > > if (ret < 0 || !info.addr) > > return AE_OK; > > > > + /* Then fill IRQ number if any */ > > + ret = acpi_dev_get_resources(adev, &resource_list, NULL, > > NULL); > > + if (ret < 0) > > + return AE_OK; > > + > > + resource_list_for_each_entry(entry, &resource_list) { > > + if (resource_type(entry->res) == IORESOURCE_IRQ) { > > + info.irq = entry->res->start; > > + break; > > + } > > + } > > + > > + acpi_dev_free_resource_list(&resource_list); > > + > > adev->power.flags.ignore_parent = true; > > strlcpy(info.type, dev_name(&adev->dev), > > sizeof(info.type)); > > if (!i2c_new_device(adapter, &info)) { > > @@ -160,6 +198,8 @@ static acpi_status > > acpi_i2c_add_device(acpi_handle handle, u32 level, > > return AE_OK; > > } > > > > +#define ACPI_I2C_MAX_SCAN_DEPTH 32 > > + > > /** > > * acpi_i2c_register_devices - enumerate I2C slave devices behind > > adapter > > * @adap: pointer to adapter > > @@ -170,17 +210,13 @@ static acpi_status > > acpi_i2c_add_device(acpi_handle handle, u32 level, > > */ > > static void acpi_i2c_register_devices(struct i2c_adapter *adap) > > { > > - acpi_handle handle; > > acpi_status status; > > > > - if (!adap->dev.parent) > > - return; > > - > > - handle = ACPI_HANDLE(adap->dev.parent); > > - if (!handle) > > + if (!adap->dev.parent || !has_acpi_companion(adap > > ->dev.parent)) > > return; > > > > - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, > > + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, > > ACPI_ROOT_OBJECT, > > + ACPI_I2C_MAX_SCAN_DEPTH, > > acpi_i2c_add_device, NULL, > > adap, NULL); > > if (ACPI_FAILURE(status)) -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
