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mfd: mc13xxx: Allow to set callback for mc13xxx 

Some boards have to initialize the PMIC before other devices can
be initialized. This requires three levels of initcalls: one level
in which the PMIC is probed, one in which the board can call mc13xxx_get()
and the third one to initialize the PMIC dependent devices.

Allow to register a callback which is called once the PMIC is initialized.
This way mc13xxx_get() is no longer necessary and the number of required
initcalls levels is reduced to two.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-05-08 08:36:19 +02:00
parent 85c29d2860
commit 214f0d9264
2 changed files with 24 additions and 0 deletions
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18
drivers/mfd/mc13xxx.c
View File

@ -60,6 +60,21 @@ int mc13xxx_revision(struct mc13xxx *mc13xxx)
}
EXPORT_SYMBOL(mc13xxx_revision);
static void(*mc13xxx_init_callback)(struct mc13xxx *mc13xxx);
int mc13xxx_register_init_callback(void(*callback)(struct mc13xxx *mc13xxx))
{
if (mc13xxx_init_callback)
return -EBUSY;
mc13xxx_init_callback = callback;
if (mc_dev)
mc13xxx_init_callback(mc_dev);
return 0;
}
#ifdef CONFIG_SPI
static int spi_rw(struct spi_device *spi, void * buf, size_t len)
{
@ -350,6 +365,9 @@ static int __init mc13xxx_probe(struct device_d *dev)
mc_dev->revision = rev;
devfs_create(&mc_dev->cdev);
if (mc13xxx_init_callback)
mc13xxx_init_callback(mc_dev);
return 0;
}

6
include/mfd/mc13xxx.h
View File

@ -171,6 +171,7 @@ extern int mc13xxx_revision(struct mc13xxx *mc13xxx);
extern int mc13xxx_reg_read(struct mc13xxx *mc13xxx, u8 reg, u32 *val);
extern int mc13xxx_reg_write(struct mc13xxx *mc13xxx, u8 reg, u32 val);
extern int mc13xxx_set_bits(struct mc13xxx *mc13xxx, u8 reg, u32 mask, u32 val);
int mc13xxx_register_init_callback(void(*callback)(struct mc13xxx *mc13xxx));
#else
static inline struct mc13xxx *mc13xxx_get(void)
{
@ -196,6 +197,11 @@ static inline int mc13xxx_set_bits(struct mc13xxx *mc13xxx, u8 reg, u32 mask, u3
{
return -ENODEV;
}
static inline int mc13xxx_register_init_callback(void(*callback)(struct mc13xxx *mc13xxx))
{
return -ENODEV;
}
#endif
#endif /* __MFD_MC13XXX_H */