linux/drivers/mfd/wm8994-irq.c
<<
>>
Prefs
   1/*
   2 * wm8994-irq.c  --  Interrupt controller support for Wolfson WM8994
   3 *
   4 * Copyright 2010 Wolfson Microelectronics PLC.
   5 *
   6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7 *
   8 *  This program is free software; you can redistribute  it and/or modify it
   9 *  under  the terms of  the GNU General  Public License as published by the
  10 *  Free Software Foundation;  either version 2 of the  License, or (at your
  11 *  option) any later version.
  12 *
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/gpio.h>
  18#include <linux/i2c.h>
  19#include <linux/irq.h>
  20#include <linux/mfd/core.h>
  21#include <linux/interrupt.h>
  22#include <linux/irqdomain.h>
  23#include <linux/regmap.h>
  24
  25#include <linux/mfd/wm8994/core.h>
  26#include <linux/mfd/wm8994/pdata.h>
  27#include <linux/mfd/wm8994/registers.h>
  28
  29#include <linux/delay.h>
  30
  31static struct regmap_irq wm8994_irqs[] = {
  32        [WM8994_IRQ_TEMP_SHUT] = {
  33                .reg_offset = 1,
  34                .mask = WM8994_TEMP_SHUT_EINT,
  35        },
  36        [WM8994_IRQ_MIC1_DET] = {
  37                .reg_offset = 1,
  38                .mask = WM8994_MIC1_DET_EINT,
  39        },
  40        [WM8994_IRQ_MIC1_SHRT] = {
  41                .reg_offset = 1,
  42                .mask = WM8994_MIC1_SHRT_EINT,
  43        },
  44        [WM8994_IRQ_MIC2_DET] = {
  45                .reg_offset = 1,
  46                .mask = WM8994_MIC2_DET_EINT,
  47        },
  48        [WM8994_IRQ_MIC2_SHRT] = {
  49                .reg_offset = 1,
  50                .mask = WM8994_MIC2_SHRT_EINT,
  51        },
  52        [WM8994_IRQ_FLL1_LOCK] = {
  53                .reg_offset = 1,
  54                .mask = WM8994_FLL1_LOCK_EINT,
  55        },
  56        [WM8994_IRQ_FLL2_LOCK] = {
  57                .reg_offset = 1,
  58                .mask = WM8994_FLL2_LOCK_EINT,
  59        },
  60        [WM8994_IRQ_SRC1_LOCK] = {
  61                .reg_offset = 1,
  62                .mask = WM8994_SRC1_LOCK_EINT,
  63        },
  64        [WM8994_IRQ_SRC2_LOCK] = {
  65                .reg_offset = 1,
  66                .mask = WM8994_SRC2_LOCK_EINT,
  67        },
  68        [WM8994_IRQ_AIF1DRC1_SIG_DET] = {
  69                .reg_offset = 1,
  70                .mask = WM8994_AIF1DRC1_SIG_DET,
  71        },
  72        [WM8994_IRQ_AIF1DRC2_SIG_DET] = {
  73                .reg_offset = 1,
  74                .mask = WM8994_AIF1DRC2_SIG_DET_EINT,
  75        },
  76        [WM8994_IRQ_AIF2DRC_SIG_DET] = {
  77                .reg_offset = 1,
  78                .mask = WM8994_AIF2DRC_SIG_DET_EINT,
  79        },
  80        [WM8994_IRQ_FIFOS_ERR] = {
  81                .reg_offset = 1,
  82                .mask = WM8994_FIFOS_ERR_EINT,
  83        },
  84        [WM8994_IRQ_WSEQ_DONE] = {
  85                .reg_offset = 1,
  86                .mask = WM8994_WSEQ_DONE_EINT,
  87        },
  88        [WM8994_IRQ_DCS_DONE] = {
  89                .reg_offset = 1,
  90                .mask = WM8994_DCS_DONE_EINT,
  91        },
  92        [WM8994_IRQ_TEMP_WARN] = {
  93                .reg_offset = 1,
  94                .mask = WM8994_TEMP_WARN_EINT,
  95        },
  96        [WM8994_IRQ_GPIO(1)] = {
  97                .mask = WM8994_GP1_EINT,
  98        },
  99        [WM8994_IRQ_GPIO(2)] = {
 100                .mask = WM8994_GP2_EINT,
 101        },
 102        [WM8994_IRQ_GPIO(3)] = {
 103                .mask = WM8994_GP3_EINT,
 104        },
 105        [WM8994_IRQ_GPIO(4)] = {
 106                .mask = WM8994_GP4_EINT,
 107        },
 108        [WM8994_IRQ_GPIO(5)] = {
 109                .mask = WM8994_GP5_EINT,
 110        },
 111        [WM8994_IRQ_GPIO(6)] = {
 112                .mask = WM8994_GP6_EINT,
 113        },
 114        [WM8994_IRQ_GPIO(7)] = {
 115                .mask = WM8994_GP7_EINT,
 116        },
 117        [WM8994_IRQ_GPIO(8)] = {
 118                .mask = WM8994_GP8_EINT,
 119        },
 120        [WM8994_IRQ_GPIO(9)] = {
 121                .mask = WM8994_GP8_EINT,
 122        },
 123        [WM8994_IRQ_GPIO(10)] = {
 124                .mask = WM8994_GP10_EINT,
 125        },
 126        [WM8994_IRQ_GPIO(11)] = {
 127                .mask = WM8994_GP11_EINT,
 128        },
 129};
 130
 131static struct regmap_irq_chip wm8994_irq_chip = {
 132        .name = "wm8994",
 133        .irqs = wm8994_irqs,
 134        .num_irqs = ARRAY_SIZE(wm8994_irqs),
 135
 136        .num_regs = 2,
 137        .status_base = WM8994_INTERRUPT_STATUS_1,
 138        .mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
 139        .ack_base = WM8994_INTERRUPT_STATUS_1,
 140        .runtime_pm = true,
 141};
 142
 143static void wm8994_edge_irq_enable(struct irq_data *data)
 144{
 145}
 146
 147static void wm8994_edge_irq_disable(struct irq_data *data)
 148{
 149}
 150
 151static struct irq_chip wm8994_edge_irq_chip = {
 152        .name                   = "wm8994_edge",
 153        .irq_disable            = wm8994_edge_irq_disable,
 154        .irq_enable             = wm8994_edge_irq_enable,
 155};
 156
 157static irqreturn_t wm8994_edge_irq(int irq, void *data)
 158{
 159        struct wm8994 *wm8994 = data;
 160
 161        while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
 162                handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0));
 163
 164        return IRQ_HANDLED;
 165}
 166
 167static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq,
 168                               irq_hw_number_t hw)
 169{
 170        struct wm8994 *wm8994 = h->host_data;
 171
 172        irq_set_chip_data(virq, wm8994);
 173        irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq);
 174        irq_set_nested_thread(virq, 1);
 175
 176        /* ARM needs us to explicitly flag the IRQ as valid
 177         * and will set them noprobe when we do so. */
 178#ifdef CONFIG_ARM
 179        set_irq_flags(virq, IRQF_VALID);
 180#else
 181        irq_set_noprobe(virq);
 182#endif
 183
 184        return 0;
 185}
 186
 187static struct irq_domain_ops wm8994_edge_irq_ops = {
 188        .map    = wm8994_edge_irq_map,
 189        .xlate  = irq_domain_xlate_twocell,
 190};
 191
 192int wm8994_irq_init(struct wm8994 *wm8994)
 193{
 194        int ret;
 195        unsigned long irqflags;
 196        struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
 197
 198        if (!wm8994->irq) {
 199                dev_warn(wm8994->dev,
 200                         "No interrupt specified, no interrupts\n");
 201                wm8994->irq_base = 0;
 202                return 0;
 203        }
 204
 205        /* select user or default irq flags */
 206        irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
 207        if (pdata->irq_flags)
 208                irqflags = pdata->irq_flags;
 209
 210        /* use a GPIO for edge triggered controllers */
 211        if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
 212                if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) {
 213                        dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n",
 214                                 wm8994->irq, pdata->irq_gpio,
 215                                 gpio_to_irq(pdata->irq_gpio));
 216                        wm8994->irq = gpio_to_irq(pdata->irq_gpio);
 217                }
 218
 219                ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio,
 220                                            GPIOF_IN, "WM8994 IRQ");
 221
 222                if (ret != 0) {
 223                        dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n",
 224                                ret);
 225                        return ret;
 226                }
 227
 228                wm8994->edge_irq = irq_domain_add_linear(NULL, 1,
 229                                                         &wm8994_edge_irq_ops,
 230                                                         wm8994);
 231
 232                ret = regmap_add_irq_chip(wm8994->regmap,
 233                                          irq_create_mapping(wm8994->edge_irq,
 234                                                             0),
 235                                          IRQF_ONESHOT,
 236                                          wm8994->irq_base, &wm8994_irq_chip,
 237                                          &wm8994->irq_data);
 238                if (ret != 0) {
 239                        dev_err(wm8994->dev, "Failed to get IRQ: %d\n",
 240                                ret);
 241                        return ret;
 242                }
 243
 244                ret = request_threaded_irq(wm8994->irq,
 245                                           NULL, wm8994_edge_irq,
 246                                           irqflags,
 247                                           "WM8994 edge", wm8994);
 248        } else {
 249                ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
 250                                          irqflags,
 251                                          wm8994->irq_base, &wm8994_irq_chip,
 252                                          &wm8994->irq_data);
 253        }
 254
 255        if (ret != 0) {
 256                dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
 257                return ret;
 258        }
 259
 260        /* Enable top level interrupt if it was masked */
 261        wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
 262
 263        return 0;
 264}
 265
 266void wm8994_irq_exit(struct wm8994 *wm8994)
 267{
 268        regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
 269}
 270
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.