diff options
| author | Sebastian Reichel <sre@kernel.org> | 2017-03-29 15:18:20 +0300 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2017-04-11 17:17:52 +0300 |
| commit | ab781ec0e5e781849bd14291608c8626bac871e1 (patch) | |
| tree | 354710af8a6c976a3f52d55ef5b1c3d40717804b /drivers/mfd/motorola-cpcap.c | |
| parent | c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201 (diff) | |
| download | linux-ab781ec0e5e781849bd14291608c8626bac871e1.tar.xz | |
mfd: cpcap: Implement IRQ sense helper
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.
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd/motorola-cpcap.c')
| -rw-r--r-- | drivers/mfd/motorola-cpcap.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/mfd/motorola-cpcap.c b/drivers/mfd/motorola-cpcap.c index 6aeada7d7ce5..a9097efcefa5 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 irq_base = regmap_irq_chip_get_base(d); + + return cpcap_sense_irq(regmap, virq - irq_base); +} +EXPORT_SYMBOL_GPL(cpcap_sense_virq); + static int cpcap_check_revision(struct cpcap_ddata *cpcap) { u16 vendor, rev; |