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dd30acc889
If we use the dev_get_platdata, pdata can be NULL in DT environments. Actually, NULL pointer exception is occurs with error messages like this: [ 1.226583] Unable to handle kernel NULL pointer dereference at virtual address 00000044 [ 1.467910] [<c02f1e38>] (wm8994_irq_init) from [<c02f1bd4>] (wm8994_i2c_probe+0x684/0x858) [ 1.476241] [<c02f1bd4>] (wm8994_i2c_probe) from [<c0371c78>] (i2c_device_probe+0x11c/0x17c) In wm8994-core, we already checked whether platform data is NULL and set the wm8994->pdata to platform data if platform data is not NULL. So, we can use wm8994->pdata instead of platform data. Signed-off-by: Inha Song <ideal.song@samsung.com> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
265 lines
6.0 KiB
C
265 lines
6.0 KiB
C
/*
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* wm8994-irq.c -- Interrupt controller support for Wolfson WM8994
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*
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* Copyright 2010 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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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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#include <linux/mfd/wm8994/pdata.h>
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#include <linux/mfd/wm8994/registers.h>
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#include <linux/delay.h>
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static const struct regmap_irq wm8994_irqs[] = {
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[WM8994_IRQ_TEMP_SHUT] = {
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.reg_offset = 1,
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.mask = WM8994_TEMP_SHUT_EINT,
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},
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[WM8994_IRQ_MIC1_DET] = {
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.reg_offset = 1,
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.mask = WM8994_MIC1_DET_EINT,
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},
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[WM8994_IRQ_MIC1_SHRT] = {
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.reg_offset = 1,
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.mask = WM8994_MIC1_SHRT_EINT,
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},
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[WM8994_IRQ_MIC2_DET] = {
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.reg_offset = 1,
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.mask = WM8994_MIC2_DET_EINT,
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},
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[WM8994_IRQ_MIC2_SHRT] = {
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.reg_offset = 1,
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.mask = WM8994_MIC2_SHRT_EINT,
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},
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[WM8994_IRQ_FLL1_LOCK] = {
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.reg_offset = 1,
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.mask = WM8994_FLL1_LOCK_EINT,
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},
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[WM8994_IRQ_FLL2_LOCK] = {
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.reg_offset = 1,
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.mask = WM8994_FLL2_LOCK_EINT,
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},
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[WM8994_IRQ_SRC1_LOCK] = {
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.reg_offset = 1,
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.mask = WM8994_SRC1_LOCK_EINT,
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},
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[WM8994_IRQ_SRC2_LOCK] = {
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.reg_offset = 1,
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.mask = WM8994_SRC2_LOCK_EINT,
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},
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[WM8994_IRQ_AIF1DRC1_SIG_DET] = {
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.reg_offset = 1,
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.mask = WM8994_AIF1DRC1_SIG_DET,
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},
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[WM8994_IRQ_AIF1DRC2_SIG_DET] = {
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.reg_offset = 1,
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.mask = WM8994_AIF1DRC2_SIG_DET_EINT,
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},
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[WM8994_IRQ_AIF2DRC_SIG_DET] = {
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.reg_offset = 1,
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.mask = WM8994_AIF2DRC_SIG_DET_EINT,
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},
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[WM8994_IRQ_FIFOS_ERR] = {
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.reg_offset = 1,
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.mask = WM8994_FIFOS_ERR_EINT,
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},
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[WM8994_IRQ_WSEQ_DONE] = {
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.reg_offset = 1,
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.mask = WM8994_WSEQ_DONE_EINT,
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},
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[WM8994_IRQ_DCS_DONE] = {
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.reg_offset = 1,
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.mask = WM8994_DCS_DONE_EINT,
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},
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[WM8994_IRQ_TEMP_WARN] = {
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.reg_offset = 1,
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.mask = WM8994_TEMP_WARN_EINT,
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},
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[WM8994_IRQ_GPIO(1)] = {
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.mask = WM8994_GP1_EINT,
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},
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[WM8994_IRQ_GPIO(2)] = {
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.mask = WM8994_GP2_EINT,
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},
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[WM8994_IRQ_GPIO(3)] = {
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.mask = WM8994_GP3_EINT,
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},
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[WM8994_IRQ_GPIO(4)] = {
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.mask = WM8994_GP4_EINT,
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},
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[WM8994_IRQ_GPIO(5)] = {
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.mask = WM8994_GP5_EINT,
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},
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[WM8994_IRQ_GPIO(6)] = {
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.mask = WM8994_GP6_EINT,
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},
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[WM8994_IRQ_GPIO(7)] = {
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.mask = WM8994_GP7_EINT,
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},
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[WM8994_IRQ_GPIO(8)] = {
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.mask = WM8994_GP8_EINT,
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},
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[WM8994_IRQ_GPIO(9)] = {
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.mask = WM8994_GP8_EINT,
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},
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[WM8994_IRQ_GPIO(10)] = {
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.mask = WM8994_GP10_EINT,
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},
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[WM8994_IRQ_GPIO(11)] = {
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.mask = WM8994_GP11_EINT,
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},
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};
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static const struct regmap_irq_chip wm8994_irq_chip = {
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.name = "wm8994",
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.irqs = wm8994_irqs,
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.num_irqs = ARRAY_SIZE(wm8994_irqs),
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.num_regs = 2,
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.status_base = WM8994_INTERRUPT_STATUS_1,
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.mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
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.ack_base = WM8994_INTERRUPT_STATUS_1,
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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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irq_set_noprobe(virq);
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return 0;
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}
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static const 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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unsigned long irqflags;
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struct wm8994_pdata *pdata = &wm8994->pdata;
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if (!wm8994->irq) {
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dev_warn(wm8994->dev,
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"No interrupt specified, no interrupts\n");
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wm8994->irq_base = 0;
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return 0;
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}
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/* select user or default irq flags */
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irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
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if (pdata->irq_flags)
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irqflags = pdata->irq_flags;
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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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}
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/* Enable top level interrupt if it was masked */
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wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
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return 0;
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}
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EXPORT_SYMBOL(wm8994_irq_init);
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void wm8994_irq_exit(struct wm8994 *wm8994)
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{
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regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
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}
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EXPORT_SYMBOL(wm8994_irq_exit);
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