CPCAP can sense if IRQ is currently set or not. This functionality is required for a few subdevices, such as the power button and usb phy modules.
Acked-by: Tony Lindgren <[email protected]> Signed-off-by: Sebastian Reichel <[email protected]> --- Hi Lee, I hope this is fine with you. I tried to come up with a sensible macro for reg, but everything I came up with actually reduced readability. -- Sebastian Changes since PATCHv3: - add explicit extern to function definition - use BIT macro for mask variable - avoid magic numbers --- drivers/mfd/motorola-cpcap.c | 28 ++++++++++++++++++++++++++++ include/linux/mfd/motorola-cpcap.h | 2 ++ 2 files changed, 30 insertions(+) diff --git a/drivers/mfd/motorola-cpcap.c b/drivers/mfd/motorola-cpcap.c index 6aeada7d7ce5..c80997a377a1 100644 --- a/drivers/mfd/motorola-cpcap.c +++ b/drivers/mfd/motorola-cpcap.c @@ -23,6 +23,8 @@ #define CPCAP_NR_IRQ_REG_BANKS 6 #define CPCAP_NR_IRQ_CHIPS 3 +#define CPCAP_REGISTER_SIZE 4 +#define CPCAP_REGISTER_BITS 16 struct cpcap_ddata { struct spi_device *spi; @@ -32,6 +34,32 @@ struct cpcap_ddata { struct regmap *regmap; }; +static int cpcap_sense_irq(struct regmap *regmap, int irq) +{ + int regnum = irq / CPCAP_REGISTER_BITS; + int mask = BIT(irq % CPCAP_REGISTER_BITS); + int reg = CPCAP_REG_INTS1 + (regnum * CPCAP_REGISTER_SIZE); + int err, val; + + if (reg < CPCAP_REG_INTS1 || reg > CPCAP_REG_INTS4) + return -EINVAL; + + err = regmap_read(regmap, reg, &val); + if (err) + return err; + + return !!(val & mask); +} + +int cpcap_sense_virq(struct regmap *regmap, int virq) +{ + struct regmap_irq_chip_data *d = irq_get_chip_data(virq); + int base = regmap_irq_chip_get_base(d); + + return cpcap_sense_irq(regmap, virq - base); +} +EXPORT_SYMBOL_GPL(cpcap_sense_virq); + static int cpcap_check_revision(struct cpcap_ddata *cpcap) { u16 vendor, rev; diff --git a/include/linux/mfd/motorola-cpcap.h b/include/linux/mfd/motorola-cpcap.h index b4031c2b2214..793aa695faa0 100644 --- a/include/linux/mfd/motorola-cpcap.h +++ b/include/linux/mfd/motorola-cpcap.h @@ -290,3 +290,5 @@ static inline int cpcap_get_vendor(struct device *dev, return 0; } + +extern int cpcap_sense_virq(struct regmap *regmap, int virq); -- 2.11.0
