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i2c: add a protocol parameter to the alert callback

Browse source 
.alert() is meant to be generic, but there is currently no way
for the device driver to know which protocol generated the alert.
Add a parameter in .alert() to help the device driver to understand
what is given in data.

This patch is required to have the support of SMBus Host Notify protocol
through .alert().

Tested-by: Andrew Duggan <aduggan@synaptics.com>
For hwmon:
Acked-by: Guenter Roeck <linux@roeck-us.net>
For IPMI:
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Benjamin Tissoires 2016-06-09 16:53:47 +02:00 committed by Wolfram Sang
parent 33c77abcf4
commit b4f210541f
4 changed files with 18 additions and 4 deletions
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6
drivers/char/ipmi/ipmi_ssif.c
View file

@ -568,12 +568,16 @@ static void retry_timeout(unsigned long data)
}
static void ssif_alert(struct i2c_client *client, unsigned int data)
static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type,
unsigned int data)
{
struct ssif_info *ssif_info = i2c_get_clientdata(client);
unsigned long oflags, *flags;
bool do_get = false;
if (type != I2C_PROTOCOL_SMBUS_ALERT)
return;
ssif_inc_stat(ssif_info, alerts);
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);

6
drivers/hwmon/lm90.c
View file

@ -1624,10 +1624,14 @@ static int lm90_remove(struct i2c_client *client)
return 0;
}
static void lm90_alert(struct i2c_client *client, unsigned int flag)
static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
unsigned int flag)
{
u16 alarms;
if (type != I2C_PROTOCOL_SMBUS_ALERT)
return;
if (lm90_is_tripped(client, &alarms)) {
/*
* Disable ALERT# output, because these chips don't implement

3
drivers/i2c/i2c-smbus.c
View file

@ -56,7 +56,8 @@ static int smbus_do_alert(struct device *dev, void *addrp)
if (client->dev.driver) {
driver = to_i2c_driver(client->dev.driver);
if (driver->alert)
driver->alert(client, data->flag);
driver->alert(client, I2C_PROTOCOL_SMBUS_ALERT,
data->flag);
else
dev_warn(&client->dev, "no driver alert()!\n");
} else

7
include/linux/i2c.h
View file

@ -126,6 +126,10 @@ i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
u8 command, u8 length, u8 *values);
#endif /* I2C */
enum i2c_alert_protocol {
I2C_PROTOCOL_SMBUS_ALERT,
};
/**
* struct i2c_driver - represent an I2C device driver
* @class: What kind of i2c device we instantiate (for detect)
@ -181,7 +185,8 @@ struct i2c_driver {
* For the SMBus alert protocol, there is a single bit of data passed
* as the alert response's low bit ("event flag").
*/
void (*alert)(struct i2c_client *, unsigned int data);
void (*alert)(struct i2c_client *, enum i2c_alert_protocol protocol,
unsigned int data);
/* a ioctl like command that can be used to perform specific functions
* with the device.