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authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-09 20:15:07 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-09 20:15:07 +0400
commitf7dbaef50558c08917a18f390c2609f253dc6659 (patch)
treec638428e9370117da5a2277e9fe3197ca091fc82 /drivers/i2c/i2c-core.c
parent7b9828d44194b2d90595ed4bd5131cacbf29b201 (diff)
parentebba48b702ab11bbb76e357a7246bc2f19ad02bc (diff)
downloadlinux-f7dbaef50558c08917a18f390c2609f253dc6659.tar.xz
Merge branch 'i2c/for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang: "Highlights: - class based instantiation finally dropped for most embedded drivers bringing boot up performance gains - removed two drivers (one outdated, one a duplicate) - ACPI has now operation region support (thanks to Lan Tianyu) - the i2c-stub driver got overhauled and gained new features to become more useful when writing i2c client drivers (thanks to Guenter Roeck and Jean Delvare) The rest is driver bugfixes, added bindings/ids, cleanups..." * 'i2c/for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (43 commits) i2c: mpc: delete unneeded test before of_node_put i2c: rk3x: fix interrupt handling issue i2c: imx: Fix format warning for dev_dbg i2c: qup: disable clks and return instead of just returning error i2c: exynos5: always enable HSI2C i2c: designware: add new bindings i2c: gpio: Drop dead code in i2c_gpio_remove i2c: pca954x: put the mux to disconnected state after resume i2c: st: Update i2c timings drivers/i2c/busses: use correct type for dma_map/unmap i2c: i2c-st: Use %pa to print 'resource_size_t' type i2c: s3c2410: resume the I2C controller earlier i2c: stub: Avoid an array overrun on I2C block transfers i2c: i801: Add device ID for Intel Wildcat Point PCH i2c: i801: Fix the alignment of the device table i2c: stub: Add support for banked register ranges i2c: stub: Remember the number of emulated chips i2c: stub: Add support for SMBus block commands i2c: efm32: correct namespacing of location property i2c: exynos5: remove extra line and fix an assignment ...
Diffstat (limited to 'drivers/i2c/i2c-core.c')
-rw-r--r--drivers/i2c/i2c-core.c107
1 files changed, 12 insertions, 95 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 66aa83b99383..632057a44615 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1097,101 +1097,6 @@ EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
static void of_i2c_register_devices(struct i2c_adapter *adap) { }
#endif /* CONFIG_OF */
-/* ACPI support code */
-
-#if IS_ENABLED(CONFIG_ACPI)
-static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
-{
- struct i2c_board_info *info = data;
-
- if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
- struct acpi_resource_i2c_serialbus *sb;
-
- sb = &ares->data.i2c_serial_bus;
- if (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 < 0) {
- struct resource r;
-
- if (acpi_dev_resource_interrupt(ares, 0, &r))
- info->irq = r.start;
- }
-
- /* Tell the ACPI core to skip this resource */
- return 1;
-}
-
-static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
- void *data, void **return_value)
-{
- struct i2c_adapter *adapter = data;
- struct list_head resource_list;
- struct i2c_board_info info;
- struct acpi_device *adev;
- int ret;
-
- if (acpi_bus_get_device(handle, &adev))
- return AE_OK;
- if (acpi_bus_get_status(adev) || !adev->status.present)
- return AE_OK;
-
- memset(&info, 0, sizeof(info));
- info.acpi_node.companion = adev;
- info.irq = -1;
-
- INIT_LIST_HEAD(&resource_list);
- ret = acpi_dev_get_resources(adev, &resource_list,
- acpi_i2c_add_resource, &info);
- acpi_dev_free_resource_list(&resource_list);
-
- if (ret < 0 || !info.addr)
- return AE_OK;
-
- adev->power.flags.ignore_parent = true;
- strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
- if (!i2c_new_device(adapter, &info)) {
- adev->power.flags.ignore_parent = false;
- dev_err(&adapter->dev,
- "failed to add I2C device %s from ACPI\n",
- dev_name(&adev->dev));
- }
-
- return AE_OK;
-}
-
-/**
- * acpi_i2c_register_devices - enumerate I2C slave devices behind adapter
- * @adap: pointer to adapter
- *
- * Enumerate all I2C slave devices behind this adapter by walking the ACPI
- * namespace. When a device is found it will be added to the Linux device
- * model and bound to the corresponding ACPI handle.
- */
-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)
- return;
-
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
- acpi_i2c_add_device, NULL,
- adap, NULL);
- if (ACPI_FAILURE(status))
- dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
-}
-#else
-static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) {}
-#endif /* CONFIG_ACPI */
-
static int i2c_do_add_adapter(struct i2c_driver *driver,
struct i2c_adapter *adap)
{
@@ -1298,6 +1203,7 @@ exit_recovery:
/* create pre-declared device nodes */
of_i2c_register_devices(adap);
acpi_i2c_register_devices(adap);
+ acpi_i2c_install_space_handler(adap);
if (adap->nr < __i2c_first_dynamic_bus_num)
i2c_scan_static_board_info(adap);
@@ -1471,6 +1377,7 @@ void i2c_del_adapter(struct i2c_adapter *adap)
return;
}
+ acpi_i2c_remove_space_handler(adap);
/* Tell drivers about this removal */
mutex_lock(&core_lock);
bus_for_each_drv(&i2c_bus_type, NULL, adap,
@@ -2013,6 +1920,16 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver)
if (!driver->detect || !address_list)
return 0;
+ /* Warn that the adapter lost class based instantiation */
+ if (adapter->class == I2C_CLASS_DEPRECATED) {
+ dev_dbg(&adapter->dev,
+ "This adapter dropped support for I2C classes and "
+ "won't auto-detect %s devices anymore. If you need it, check "
+ "'Documentation/i2c/instantiating-devices' for alternatives.\n",
+ driver->driver.name);
+ return 0;
+ }
+
/* Stop here if the classes do not match */
if (!(adapter->class & driver->class))
return 0;