If the WM8903 is hooked up to an interrupt, set the irq_active_low flag in the default platform data based on the IRQ's IRQ_TYPE. Map IRQ_TYPE_NONE (a lack of explicit configuration/restriction) to irq_active_low = false; the previous default.
This code is mainly added to support device tree interrupt bindings, although will work perfectly well in a non device tree system too.
Any interrupt controller that supports only a single IRQ_TYPE could set each IRQ's type based on that restriction. This applies equally with and without device tree. To cater for interrupt controllers that don't do this, for which irqd_get_trigger_type() will return IRQ_TYPE_NONE, the platform data irq_active_low field may be used in systems that don't use device tree.
With device tree, every IRQ must have some IRQ_TYPE set.
Controllers that support DT and multiple IRQ_TYPEs must define the interrupts property (as used in interrupt source nodes) such that it defines the IRQ_TYPE to use. When the core DT setup code initializes wm8903->irq, the interrupts property will be parsed, and as a side- effect, set the IRQ's IRQ_TYPE for the WM8903 probe() function to read.
Controllers that support DT and a single IRQ_TYPE could arrange to set the IRQ_TYPE somehow during their initialization, or hard-code it during the processing of the child interrupts property.
Signed-off-by: Stephen Warren swarren@nvidia.com --- sound/soc/codecs/wm8903.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c index 7e3b960..a44bbfb 100644 --- a/sound/soc/codecs/wm8903.c +++ b/sound/soc/codecs/wm8903.c @@ -25,6 +25,7 @@ #include <linux/i2c.h> #include <linux/regmap.h> #include <linux/slab.h> +#include <linux/irq.h> #include <sound/core.h> #include <sound/jack.h> #include <sound/pcm.h> @@ -2036,6 +2037,39 @@ static const struct regmap_config wm8903_regmap = { .num_reg_defaults = ARRAY_SIZE(wm8903_reg_defaults), };
+static int wm8903_set_pdata_irq_trigger(struct i2c_client *i2c, + struct wm8903_platform_data *pdata) +{ + struct irq_data *irq_data = irq_get_irq_data(i2c->irq); + if (!irq_data) { + dev_err(&i2c->dev, "Invalid IRQ: %d\n", + i2c->irq); + return -EINVAL; + } + + switch (irqd_get_trigger_type(irq_data)) { + case IRQ_TYPE_NONE: + /* + * We assume the controller imposes no restrictions, + * so we are able to select active-high + */ + /* Fall-through */ + case IRQ_TYPE_LEVEL_HIGH: + pdata->irq_active_low = false; + break; + case IRQ_TYPE_LEVEL_LOW: + pdata->irq_active_low = true; + break; + default: + dev_err(&i2c->dev, + "Unsupported IRQ_TYPE %x\n", + irqd_get_trigger_type(irq_data)); + return -EINVAL; + } + + return 0; +} + static __devinit int wm8903_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { @@ -2071,6 +2105,12 @@ static __devinit int wm8903_i2c_probe(struct i2c_client *i2c, dev_err(&i2c->dev, "Failed to allocate pdata\n"); return -ENOMEM; } + + if (i2c->irq) { + ret = wm8903_set_pdata_irq_trigger(i2c, wm8903->pdata); + if (ret != 0) + return ret; + } }
ret = regmap_read(wm8903->regmap, WM8903_SW_RESET_AND_ID, &val);