diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-04-25 14:51:49 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2020-05-11 21:21:34 +0200 |
| commit | 19bb22273c42bac264febe38f53a8b9d004a8df5 (patch) | |
| tree | 8a5ad77f40502a535d57600daadff465cc7a5d0d /drivers/i2c | |
| parent | 73371d5f313aa056a451f84b652623da6054f89b (diff) | |
i2c: mux: pca954x: Refactor pca954x_irq_handler()
Refactor pca954x_irq_handler() to:
- use for_each_set_bit() macro
- use IRQ_RETVAL() macro
Above change makes code easy to read and understand.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/muxes/i2c-mux-pca954x.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index a0d926ae3f86..b764c7c746e9 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -327,21 +327,18 @@ static DEVICE_ATTR_RW(idle_state); static irqreturn_t pca954x_irq_handler(int irq, void *dev_id) { struct pca954x *data = dev_id; - unsigned int child_irq; - int ret, i, handled = 0; + unsigned long pending; + int ret, i; ret = i2c_smbus_read_byte(data->client); if (ret < 0) return IRQ_NONE; - for (i = 0; i < data->chip->nchans; i++) { - if (ret & BIT(PCA954X_IRQ_OFFSET + i)) { - child_irq = irq_linear_revmap(data->irq, i); - handle_nested_irq(child_irq); - handled++; - } - } - return handled ? IRQ_HANDLED : IRQ_NONE; + pending = (ret >> PCA954X_IRQ_OFFSET) & (BIT(data->chip->nchans) - 1); + for_each_set_bit(i, &pending, data->chip->nchans) + handle_nested_irq(irq_linear_revmap(data->irq, i)); + + return IRQ_RETVAL(pending); } static int pca954x_irq_set_type(struct irq_data *idata, unsigned int type) |