diff options
Diffstat (limited to 'drivers/gpio/gpio-pca953x.c')
| -rw-r--r-- | drivers/gpio/gpio-pca953x.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index e66084c295fb..5e3be32ebb8d 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -38,8 +38,13 @@ #define PCA957X_MSK 6 #define PCA957X_INTS 7 +#define PCAL953X_IN_LATCH 34 +#define PCAL953X_INT_MASK 37 +#define PCAL953X_INT_STAT 38 + #define PCA_GPIO_MASK 0x00FF #define PCA_INT 0x0100 +#define PCA_PCAL 0x0200 #define PCA953X_TYPE 0x1000 #define PCA957X_TYPE 0x2000 #define PCA_TYPE_MASK 0xF000 @@ -77,7 +82,7 @@ static const struct i2c_device_id pca953x_id[] = { MODULE_DEVICE_TABLE(i2c, pca953x_id); static const struct acpi_device_id pca953x_acpi_ids[] = { - { "INT3491", 16 | PCA953X_TYPE | PCA_INT, }, + { "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, }, { } }; MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids); @@ -437,6 +442,18 @@ static void pca953x_irq_bus_sync_unlock(struct irq_data *d) struct pca953x_chip *chip = gpiochip_get_data(gc); u8 new_irqs; int level, i; + u8 invert_irq_mask[MAX_BANK]; + + if (chip->driver_data & PCA_PCAL) { + /* Enable latch on interrupt-enabled inputs */ + pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask); + + for (i = 0; i < NBANK(chip); i++) + invert_irq_mask[i] = ~chip->irq_mask[i]; + + /* Unmask enabled interrupts */ + pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask); + } /* Look for any newly setup interrupt */ for (i = 0; i < NBANK(chip); i++) { @@ -498,6 +515,29 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending) u8 trigger[MAX_BANK]; int ret, i, offset = 0; + if (chip->driver_data & PCA_PCAL) { + /* Read the current interrupt status from the device */ + ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger); + if (ret) + return false; + + /* Check latched inputs and clear interrupt status */ + ret = pca953x_read_regs(chip, PCA953X_INPUT, cur_stat); + if (ret) + return false; + + for (i = 0; i < NBANK(chip); i++) { + /* Apply filter for rising/falling edge selection */ + pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) | + (cur_stat[i] & chip->irq_trig_raise[i]); + pending[i] &= trigger[i]; + if (pending[i]) + pending_seen = true; + } + + return pending_seen; + } + switch (chip->chip_type) { case PCA953X_TYPE: offset = PCA953X_INPUT; |