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Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 

Pull i2c updates from Wolfram Sang:
 "Some I2C core API additions which are kind of simple but enhance error
  checking for users a lot, especially by returning errno now.

  There are wrappers to still support the old API but it will be removed
  once all users are converted"

* 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: core: add device-managed version of i2c_new_dummy
  i2c: core: improve return value handling of i2c_new_device and i2c_new_dummy
hifive-unleashed-5.2
Linus Torvalds 2019-05-19 11:47:03 -07:00
parent c4d36b63b2 b8f5fe3bc5
commit f23d8719e7
3 changed files with 111 additions and 13 deletions
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3
Documentation/driver-model/devres.txt
View File

@ -271,6 +271,9 @@ GPIO
devm_gpio_request_one()
devm_gpio_free()
I2C
devm_i2c_new_dummy_device()
IIO
devm_iio_device_alloc()
devm_iio_device_free()

118
drivers/i2c/i2c-core-base.c
View File

@ -714,7 +714,7 @@ static int i2c_dev_irq_from_resources(const struct resource *resources,
}
/**
* i2c_new_device - instantiate an i2c device
* i2c_new_client_device - instantiate an i2c device
* @adap: the adapter managing the device
* @info: describes one I2C device; bus_num is ignored
* Context: can sleep
@ -727,17 +727,17 @@ static int i2c_dev_irq_from_resources(const struct resource *resources,
* before any i2c_adapter could exist.
*
* This returns the new i2c client, which may be saved for later use with
* i2c_unregister_device(); or NULL to indicate an error.
* i2c_unregister_device(); or an ERR_PTR to describe the error.
*/
struct i2c_client *
i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
static struct i2c_client *
i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
{
struct i2c_client *client;
int status;
client = kzalloc(sizeof *client, GFP_KERNEL);
if (!client)
return NULL;
return ERR_PTR(-ENOMEM);
client->adapter = adap;
@ -803,7 +803,31 @@ out_err:
client->name, client->addr, status);
out_err_silent:
kfree(client);
return NULL;
return ERR_PTR(status);
}
EXPORT_SYMBOL_GPL(i2c_new_client_device);
/**
* i2c_new_device - instantiate an i2c device
* @adap: the adapter managing the device
* @info: describes one I2C device; bus_num is ignored
* Context: can sleep
*
* This deprecated function has the same functionality as
* @i2c_new_client_device, it just returns NULL instead of an ERR_PTR in case of
* an error for compatibility with current I2C API. It will be removed once all
* users are converted.
*
* This returns the new i2c client, which may be saved for later use with
* i2c_unregister_device(); or NULL to indicate an error.
*/
struct i2c_client *
i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
{
struct i2c_client *ret;
ret = i2c_new_client_device(adap, info);
return IS_ERR(ret) ? NULL : ret;
}
EXPORT_SYMBOL_GPL(i2c_new_device);
@ -854,7 +878,7 @@ static struct i2c_driver dummy_driver = {
};
/**
* i2c_new_dummy - return a new i2c device bound to a dummy driver
* i2c_new_dummy_device - return a new i2c device bound to a dummy driver
* @adapter: the adapter managing the device
* @address: seven bit address to be used
* Context: can sleep
@ -869,18 +893,86 @@ static struct i2c_driver dummy_driver = {
* different driver.
*
* This returns the new i2c client, which should be saved for later use with
* i2c_unregister_device(); or NULL to indicate an error.
* i2c_unregister_device(); or an ERR_PTR to describe the error.
*/
struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
static struct i2c_client *
i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address)
{
struct i2c_board_info info = {
I2C_BOARD_INFO("dummy", address),
};
return i2c_new_device(adapter, &info);
return i2c_new_client_device(adapter, &info);
}
EXPORT_SYMBOL_GPL(i2c_new_dummy_device);
/**
* i2c_new_dummy - return a new i2c device bound to a dummy driver
* @adapter: the adapter managing the device
* @address: seven bit address to be used
* Context: can sleep
*
* This deprecated function has the same functionality as @i2c_new_dummy_device,
* it just returns NULL instead of an ERR_PTR in case of an error for
* compatibility with current I2C API. It will be removed once all users are
* converted.
*
* This returns the new i2c client, which should be saved for later use with
* i2c_unregister_device(); or NULL to indicate an error.
*/
struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
{
struct i2c_client *ret;
ret = i2c_new_dummy_device(adapter, address);
return IS_ERR(ret) ? NULL : ret;
}
EXPORT_SYMBOL_GPL(i2c_new_dummy);
struct i2c_dummy_devres {
struct i2c_client *client;
};
static void devm_i2c_release_dummy(struct device *dev, void *res)
{
struct i2c_dummy_devres *this = res;
i2c_unregister_device(this->client);
}
/**
* devm_i2c_new_dummy_device - return a new i2c device bound to a dummy driver
* @dev: device the managed resource is bound to
* @adapter: the adapter managing the device
* @address: seven bit address to be used
* Context: can sleep
*
* This is the device-managed version of @i2c_new_dummy_device. It returns the
* new i2c client or an ERR_PTR in case of an error.
*/
struct i2c_client *devm_i2c_new_dummy_device(struct device *dev,
struct i2c_adapter *adapter,
u16 address)
{
struct i2c_dummy_devres *dr;
struct i2c_client *client;
dr = devres_alloc(devm_i2c_release_dummy, sizeof(*dr), GFP_KERNEL);
if (!dr)
return ERR_PTR(-ENOMEM);
client = i2c_new_dummy_device(adapter, address);
if (IS_ERR(client)) {
devres_free(dr);
} else {
dr->client = client;
devres_add(dev, dr);
}
return client;
}
EXPORT_SYMBOL_GPL(devm_i2c_new_dummy_device);
/**
* i2c_new_secondary_device - Helper to get the instantiated secondary address
* and create the associated device
@ -1000,9 +1092,9 @@ i2c_sysfs_new_device(struct device *dev, struct device_attribute *attr,
info.flags |= I2C_CLIENT_SLAVE;
}
client = i2c_new_device(adap, &info);
if (!client)
return -EINVAL;
client = i2c_new_client_device(adap, &info);
if (IS_ERR(client))
return PTR_ERR(client);
/* Keep track of the added device */
mutex_lock(&adap->userspace_clients_lock);

3
include/linux/i2c.h
View File

@ -469,6 +469,9 @@ extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
extern struct i2c_client *
i2c_new_dummy(struct i2c_adapter *adap, u16 address);
extern struct i2c_client *
devm_i2c_new_dummy_device(struct device *dev, struct i2c_adapter *adap, u16 address);
extern struct i2c_client *
i2c_new_secondary_device(struct i2c_client *client,
const char *name,