--- /dev/null
+/*
+ * wm8994-irq.c -- Interrupt controller support for Wolfson WM8994
+ *
+ * Copyright 2010 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/wm8994/core.h>
+#include <linux/mfd/wm8994/pdata.h>
+#include <linux/mfd/wm8994/registers.h>
+
+#include <linux/delay.h>
+
+static struct regmap_irq wm8994_irqs[] = {
+ [WM8994_IRQ_TEMP_SHUT] = {
+ .reg_offset = 1,
+ .mask = WM8994_TEMP_SHUT_EINT,
+ },
+ [WM8994_IRQ_MIC1_DET] = {
+ .reg_offset = 1,
+ .mask = WM8994_MIC1_DET_EINT,
+ },
+ [WM8994_IRQ_MIC1_SHRT] = {
+ .reg_offset = 1,
+ .mask = WM8994_MIC1_SHRT_EINT,
+ },
+ [WM8994_IRQ_MIC2_DET] = {
+ .reg_offset = 1,
+ .mask = WM8994_MIC2_DET_EINT,
+ },
+ [WM8994_IRQ_MIC2_SHRT] = {
+ .reg_offset = 1,
+ .mask = WM8994_MIC2_SHRT_EINT,
+ },
+ [WM8994_IRQ_FLL1_LOCK] = {
+ .reg_offset = 1,
+ .mask = WM8994_FLL1_LOCK_EINT,
+ },
+ [WM8994_IRQ_FLL2_LOCK] = {
+ .reg_offset = 1,
+ .mask = WM8994_FLL2_LOCK_EINT,
+ },
+ [WM8994_IRQ_SRC1_LOCK] = {
+ .reg_offset = 1,
+ .mask = WM8994_SRC1_LOCK_EINT,
+ },
+ [WM8994_IRQ_SRC2_LOCK] = {
+ .reg_offset = 1,
+ .mask = WM8994_SRC2_LOCK_EINT,
+ },
+ [WM8994_IRQ_AIF1DRC1_SIG_DET] = {
+ .reg_offset = 1,
+ .mask = WM8994_AIF1DRC1_SIG_DET,
+ },
+ [WM8994_IRQ_AIF1DRC2_SIG_DET] = {
+ .reg_offset = 1,
+ .mask = WM8994_AIF1DRC2_SIG_DET_EINT,
+ },
+ [WM8994_IRQ_AIF2DRC_SIG_DET] = {
+ .reg_offset = 1,
+ .mask = WM8994_AIF2DRC_SIG_DET_EINT,
+ },
+ [WM8994_IRQ_FIFOS_ERR] = {
+ .reg_offset = 1,
+ .mask = WM8994_FIFOS_ERR_EINT,
+ },
+ [WM8994_IRQ_WSEQ_DONE] = {
+ .reg_offset = 1,
+ .mask = WM8994_WSEQ_DONE_EINT,
+ },
+ [WM8994_IRQ_DCS_DONE] = {
+ .reg_offset = 1,
+ .mask = WM8994_DCS_DONE_EINT,
+ },
+ [WM8994_IRQ_TEMP_WARN] = {
+ .reg_offset = 1,
+ .mask = WM8994_TEMP_WARN_EINT,
+ },
+ [WM8994_IRQ_GPIO(1)] = {
+ .mask = WM8994_GP1_EINT,
+ },
+ [WM8994_IRQ_GPIO(2)] = {
+ .mask = WM8994_GP2_EINT,
+ },
+ [WM8994_IRQ_GPIO(3)] = {
+ .mask = WM8994_GP3_EINT,
+ },
+ [WM8994_IRQ_GPIO(4)] = {
+ .mask = WM8994_GP4_EINT,
+ },
+ [WM8994_IRQ_GPIO(5)] = {
+ .mask = WM8994_GP5_EINT,
+ },
+ [WM8994_IRQ_GPIO(6)] = {
+ .mask = WM8994_GP6_EINT,
+ },
+ [WM8994_IRQ_GPIO(7)] = {
+ .mask = WM8994_GP7_EINT,
+ },
+ [WM8994_IRQ_GPIO(8)] = {
+ .mask = WM8994_GP8_EINT,
+ },
+ [WM8994_IRQ_GPIO(9)] = {
+ .mask = WM8994_GP8_EINT,
+ },
+ [WM8994_IRQ_GPIO(10)] = {
+ .mask = WM8994_GP10_EINT,
+ },
+ [WM8994_IRQ_GPIO(11)] = {
+ .mask = WM8994_GP11_EINT,
+ },
+};
+
+static struct regmap_irq_chip wm8994_irq_chip = {
+ .name = "wm8994",
+ .irqs = wm8994_irqs,
+ .num_irqs = ARRAY_SIZE(wm8994_irqs),
+
+ .num_regs = 2,
+ .status_base = WM8994_INTERRUPT_STATUS_1,
+ .mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
+ .ack_base = WM8994_INTERRUPT_STATUS_1,
+ .runtime_pm = true,
+};
+
+static void wm8994_edge_irq_enable(struct irq_data *data)
+{
+}
+
+static void wm8994_edge_irq_disable(struct irq_data *data)
+{
+}
+
+static struct irq_chip wm8994_edge_irq_chip = {
+ .name = "wm8994_edge",
+ .irq_disable = wm8994_edge_irq_disable,
+ .irq_enable = wm8994_edge_irq_enable,
+};
+
+static irqreturn_t wm8994_edge_irq(int irq, void *data)
+{
+ struct wm8994 *wm8994 = data;
+
+ while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
+ handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0));
+
+ return IRQ_HANDLED;
+}
+
+static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ struct wm8994 *wm8994 = h->host_data;
+
+ irq_set_chip_data(virq, wm8994);
+ irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq);
+ irq_set_nested_thread(virq, 1);
+
+ /* ARM needs us to explicitly flag the IRQ as valid
+ * and will set them noprobe when we do so. */
+#ifdef CONFIG_ARM
+ set_irq_flags(virq, IRQF_VALID);
+#else
+ irq_set_noprobe(virq);
+#endif
+
+ return 0;
+}
+
+static struct irq_domain_ops wm8994_edge_irq_ops = {
+ .map = wm8994_edge_irq_map,
+ .xlate = irq_domain_xlate_twocell,
+};
+
+int wm8994_irq_init(struct wm8994 *wm8994)
+{
+ int ret;
+ unsigned long irqflags;
+ struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
+
+ if (!wm8994->irq) {
+ dev_warn(wm8994->dev,
+ "No interrupt specified, no interrupts\n");
+ wm8994->irq_base = 0;
+ return 0;
+ }
+
+ /* select user or default irq flags */
+ irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
+ if (pdata->irq_flags)
+ irqflags = pdata->irq_flags;
+
+ /* use a GPIO for edge triggered controllers */
+ if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
+ if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) {
+ dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n",
+ wm8994->irq, pdata->irq_gpio,
+ gpio_to_irq(pdata->irq_gpio));
+ wm8994->irq = gpio_to_irq(pdata->irq_gpio);
+ }
+
+ ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio,
+ GPIOF_IN, "WM8994 IRQ");
+
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n",
+ ret);
+ return ret;
+ }
+
+ wm8994->edge_irq = irq_domain_add_linear(NULL, 1,
+ &wm8994_edge_irq_ops,
+ wm8994);
+
+ ret = regmap_add_irq_chip(wm8994->regmap,
+ irq_create_mapping(wm8994->edge_irq,
+ 0),
+ IRQF_ONESHOT,
+ wm8994->irq_base, &wm8994_irq_chip,
+ &wm8994->irq_data);
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to get IRQ: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = request_threaded_irq(wm8994->irq,
+ NULL, wm8994_edge_irq,
+ irqflags,
+ "WM8994 edge", wm8994);
+ } else {
+ ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
+ irqflags,
+ wm8994->irq_base, &wm8994_irq_chip,
+ &wm8994->irq_data);
+ }
+
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
+ return ret;
+ }
+
+ /* Enable top level interrupt if it was masked */
+ wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
+
+ return 0;
+}
+EXPORT_SYMBOL(wm8994_irq_init);
+
+void wm8994_irq_exit(struct wm8994 *wm8994)
+{
+ regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
+}
+EXPORT_SYMBOL(wm8994_irq_exit);
Code Review / kvmfornfv.git / blobdiff