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i2c: convert SMBus alert setup function to return an ERRPTR

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Only few drivers use this call, so drivers and I2C core are converted at
once with this patch. By simply using i2c_new_client_device() instead of
i2c_new_device(), we easily can return an ERRPTR for this function as
well. To make out of tree users aware that something changed, the
function is renamed to i2c_new_smbus_alert_device().

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2020-02-28 18:12:20 +01:00 committed by Wolfram Sang
parent 0f82056407
commit ed68052226
7 changed files with 35 additions and 27 deletions
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2
Documentation/i2c/smbus-protocol.rst
View File

@ -274,7 +274,7 @@ to know which slave triggered the interrupt.
This is implemented the following way in the Linux kernel:
* I2C bus drivers which support SMBus alert should call
i2c_setup_smbus_alert() to setup SMBus alert support.
i2c_new_smbus_alert_device() to install SMBus alert support.
* I2C drivers for devices which can trigger SMBus alerts should implement
the optional alert() callback.

12
drivers/i2c/busses/i2c-parport.c
View File

@ -333,13 +333,17 @@ static void i2c_parport_attach(struct parport *port)
/* Setup SMBus alert if supported */
if (adapter_parm[type].smbus_alert) {
adapter->ara = i2c_setup_smbus_alert(&adapter->adapter,
&adapter->alert_data);
if (adapter->ara)
struct i2c_client *ara;
ara = i2c_new_smbus_alert_device(&adapter->adapter,
&adapter->alert_data);
if (!IS_ERR(ara)) {
adapter->ara = ara;
parport_enable_irq(port);
else
} else {
dev_warn(&adapter->pdev->dev,
"Failed to register ARA client\n");
}
}
/* Add the new adapter to the list */

11
drivers/i2c/busses/i2c-thunderx-pcidrv.c
View File

@ -118,6 +118,8 @@ static void thunder_i2c_clock_disable(struct device *dev, struct clk *clk)
static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c,
struct device_node *node)
{
struct i2c_client *ara;
if (!node)
return -EINVAL;
@ -125,9 +127,12 @@ static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c,
if (!i2c->alert_data.irq)
return -EINVAL;
i2c->ara = i2c_setup_smbus_alert(&i2c->adap, &i2c->alert_data);
if (!i2c->ara)
return -ENODEV;
ara = i2c_new_smbus_alert_device(&i2c->adap, &i2c->alert_data);
if (IS_ERR(ara))
return PTR_ERR(ara);
i2c->ara = ara;
return 0;
}

10
drivers/i2c/busses/i2c-xlp9xx.c
View File

@ -491,12 +491,16 @@ static int xlp9xx_i2c_get_frequency(struct platform_device *pdev,
static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv,
struct platform_device *pdev)
{
struct i2c_client *ara;
if (!priv->alert_data.irq)
return -EINVAL;
priv->ara = i2c_setup_smbus_alert(&priv->adapter, &priv->alert_data);
if (!priv->ara)
return -ENODEV;
ara = i2c_new_smbus_alert_device(&priv->adapter, &priv->alert_data);
if (IS_ERR(ara))
return PTR_ERR(ara);
priv->ara = ara;
return 0;
}

21
drivers/i2c/i2c-core-smbus.c
View File

@ -666,7 +666,7 @@ s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data_or_emulated);
/**
* i2c_setup_smbus_alert - Setup SMBus alert support
* i2c_new_smbus_alert_device - get ara client for SMBus alert support
* @adapter: the target adapter
* @setup: setup data for the SMBus alert handler
* Context: can sleep
@ -682,25 +682,24 @@ EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data_or_emulated);
* should have said it's level triggered.
*
* This returns the ara client, which should be saved for later use with
* i2c_handle_smbus_alert() and ultimately i2c_unregister_device(); or NULL
* to indicate an error.
* i2c_handle_smbus_alert() and ultimately i2c_unregister_device(); or an
* ERRPTR to indicate an error.
*/
struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
struct i2c_smbus_alert_setup *setup)
struct i2c_client *i2c_new_smbus_alert_device(struct i2c_adapter *adapter,
struct i2c_smbus_alert_setup *setup)
{
struct i2c_board_info ara_board_info = {
I2C_BOARD_INFO("smbus_alert", 0x0c),
.platform_data = setup,
};
return i2c_new_device(adapter, &ara_board_info);
return i2c_new_client_device(adapter, &ara_board_info);
}
EXPORT_SYMBOL_GPL(i2c_setup_smbus_alert);
EXPORT_SYMBOL_GPL(i2c_new_smbus_alert_device);
#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)
int of_i2c_setup_smbus_alert(struct i2c_adapter *adapter)
{
struct i2c_client *client;
int irq;
irq = of_property_match_string(adapter->dev.of_node, "interrupt-names",
@ -710,11 +709,7 @@ int of_i2c_setup_smbus_alert(struct i2c_adapter *adapter)
else if (irq < 0)
return irq;
client = i2c_setup_smbus_alert(adapter, NULL);
if (!client)
return -ENODEV;
return 0;
return PTR_ERR_OR_ZERO(i2c_new_smbus_alert_device(adapter, NULL));
}
EXPORT_SYMBOL_GPL(of_i2c_setup_smbus_alert);
#endif

2
drivers/i2c/i2c-smbus.c
View File

@ -184,7 +184,7 @@ static struct i2c_driver smbalert_driver = {
* corresponding I2C device driver's alert function.
*
* It is assumed that ara is a valid i2c client previously returned by
* i2c_setup_smbus_alert().
* i2c_new_smbus_alert_device().
*/
int i2c_handle_smbus_alert(struct i2c_client *ara)
{

4
include/linux/i2c-smbus.h
View File

@ -31,8 +31,8 @@ struct i2c_smbus_alert_setup {
int irq;
};
struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
struct i2c_smbus_alert_setup *setup);
struct i2c_client *i2c_new_smbus_alert_device(struct i2c_adapter *adapter,
struct i2c_smbus_alert_setup *setup);
int i2c_handle_smbus_alert(struct i2c_client *ara);
#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)