mfd: wm8994: Emulate level triggered interrupts if required
The interrupt controller on the wm8994 series of devices requires a level triggered parent. If one is not available but a GPIO is available for the interrupt then emulate. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown
Samuel Ortiz
parent
fc83f586ad
commit
7c8844481a
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@ -14,10 +14,12 @@
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/mfd/core.h>
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#include <linux/interrupt.h>
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#include <linux/irqdomain.h>
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#include <linux/regmap.h>
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#include <linux/mfd/wm8994/core.h>
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@ -138,6 +140,55 @@ static struct regmap_irq_chip wm8994_irq_chip = {
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.runtime_pm = true,
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};
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static void wm8994_edge_irq_enable(struct irq_data *data)
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{
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}
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static void wm8994_edge_irq_disable(struct irq_data *data)
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{
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}
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static struct irq_chip wm8994_edge_irq_chip = {
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.name = "wm8994_edge",
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.irq_disable = wm8994_edge_irq_disable,
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.irq_enable = wm8994_edge_irq_enable,
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};
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static irqreturn_t wm8994_edge_irq(int irq, void *data)
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{
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struct wm8994 *wm8994 = data;
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while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
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handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0));
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return IRQ_HANDLED;
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}
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static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw)
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{
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struct wm8994 *wm8994 = h->host_data;
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irq_set_chip_data(virq, wm8994);
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irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq);
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irq_set_nested_thread(virq, 1);
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/* ARM needs us to explicitly flag the IRQ as valid
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* and will set them noprobe when we do so. */
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#ifdef CONFIG_ARM
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set_irq_flags(virq, IRQF_VALID);
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#else
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irq_set_noprobe(virq);
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#endif
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return 0;
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}
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static struct irq_domain_ops wm8994_edge_irq_ops = {
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.map = wm8994_edge_irq_map,
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.xlate = irq_domain_xlate_twocell,
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};
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int wm8994_irq_init(struct wm8994 *wm8994)
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{
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int ret;
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@ -156,10 +207,51 @@ int wm8994_irq_init(struct wm8994 *wm8994)
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if (pdata->irq_flags)
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irqflags = pdata->irq_flags;
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ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
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irqflags,
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wm8994->irq_base, &wm8994_irq_chip,
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&wm8994->irq_data);
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/* use a GPIO for edge triggered controllers */
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if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
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if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) {
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dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n",
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wm8994->irq, pdata->irq_gpio,
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gpio_to_irq(pdata->irq_gpio));
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wm8994->irq = gpio_to_irq(pdata->irq_gpio);
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}
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ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio,
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GPIOF_IN, "WM8994 IRQ");
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if (ret != 0) {
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dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n",
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ret);
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return ret;
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}
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wm8994->edge_irq = irq_domain_add_linear(NULL, 1,
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&wm8994_edge_irq_ops,
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wm8994);
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ret = regmap_add_irq_chip(wm8994->regmap,
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irq_create_mapping(wm8994->edge_irq,
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0),
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IRQF_ONESHOT,
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wm8994->irq_base, &wm8994_irq_chip,
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&wm8994->irq_data);
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if (ret != 0) {
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dev_err(wm8994->dev, "Failed to get IRQ: %d\n",
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ret);
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return ret;
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}
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ret = request_threaded_irq(wm8994->irq,
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NULL, wm8994_edge_irq,
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irqflags,
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"WM8994 edge", wm8994);
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} else {
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ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
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irqflags,
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wm8994->irq_base, &wm8994_irq_chip,
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&wm8994->irq_data);
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}
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if (ret != 0) {
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dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
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return ret;
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@ -29,6 +29,7 @@ enum wm8994_type {
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struct regulator_dev;
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struct regulator_bulk_data;
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struct irq_domain;
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#define WM8994_NUM_GPIO_REGS 11
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#define WM8994_NUM_LDO_REGS 2
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@ -73,6 +74,7 @@ struct wm8994 {
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int irq;
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struct regmap_irq_chip_data *irq_data;
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struct irq_domain *edge_irq;
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/* Used over suspend/resume */
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bool suspended;
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@ -223,6 +223,11 @@ struct wm8994_pdata {
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* lines is mastered.
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*/
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int max_channels_clocked[WM8994_NUM_AIF];
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/**
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* GPIO for the IRQ pin if host only supports edge triggering
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*/
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int irq_gpio;
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};
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#endif
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