linux/drivers/mfd/arizona-irq.c
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   1/*
   2 * Arizona interrupt support
   3 *
   4 * Copyright 2012 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
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/delay.h>
  14#include <linux/gpio.h>
  15#include <linux/interrupt.h>
  16#include <linux/irq.h>
  17#include <linux/irqdomain.h>
  18#include <linux/module.h>
  19#include <linux/pm_runtime.h>
  20#include <linux/regmap.h>
  21#include <linux/regulator/consumer.h>
  22#include <linux/slab.h>
  23
  24#include <linux/mfd/arizona/core.h>
  25#include <linux/mfd/arizona/registers.h>
  26
  27#include "arizona.h"
  28
  29static int arizona_map_irq(struct arizona *arizona, int irq)
  30{
  31        int ret;
  32
  33        ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
  34        if (ret < 0)
  35                ret = regmap_irq_get_virq(arizona->irq_chip, irq);
  36
  37        return ret;
  38}
  39
  40int arizona_request_irq(struct arizona *arizona, int irq, char *name,
  41                           irq_handler_t handler, void *data)
  42{
  43        irq = arizona_map_irq(arizona, irq);
  44        if (irq < 0)
  45                return irq;
  46
  47        return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
  48                                    name, data);
  49}
  50EXPORT_SYMBOL_GPL(arizona_request_irq);
  51
  52void arizona_free_irq(struct arizona *arizona, int irq, void *data)
  53{
  54        irq = arizona_map_irq(arizona, irq);
  55        if (irq < 0)
  56                return;
  57
  58        free_irq(irq, data);
  59}
  60EXPORT_SYMBOL_GPL(arizona_free_irq);
  61
  62int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
  63{
  64        irq = arizona_map_irq(arizona, irq);
  65        if (irq < 0)
  66                return irq;
  67
  68        return irq_set_irq_wake(irq, on);
  69}
  70EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
  71
  72static irqreturn_t arizona_boot_done(int irq, void *data)
  73{
  74        struct arizona *arizona = data;
  75
  76        dev_dbg(arizona->dev, "Boot done\n");
  77
  78        return IRQ_HANDLED;
  79}
  80
  81static irqreturn_t arizona_ctrlif_err(int irq, void *data)
  82{
  83        struct arizona *arizona = data;
  84
  85        /*
  86         * For pretty much all potential sources a register cache sync
  87         * won't help, we've just got a software bug somewhere.
  88         */
  89        dev_err(arizona->dev, "Control interface error\n");
  90
  91        return IRQ_HANDLED;
  92}
  93
  94static irqreturn_t arizona_irq_thread(int irq, void *data)
  95{
  96        struct arizona *arizona = data;
  97        int i, ret;
  98
  99        ret = pm_runtime_get_sync(arizona->dev);
 100        if (ret < 0) {
 101                dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
 102                return IRQ_NONE;
 103        }
 104
 105        /* Check both domains */
 106        for (i = 0; i < 2; i++)
 107                handle_nested_irq(irq_find_mapping(arizona->virq, i));
 108
 109        pm_runtime_mark_last_busy(arizona->dev);
 110        pm_runtime_put_autosuspend(arizona->dev);
 111
 112        return IRQ_HANDLED;
 113}
 114
 115static void arizona_irq_enable(struct irq_data *data)
 116{
 117}
 118
 119static void arizona_irq_disable(struct irq_data *data)
 120{
 121}
 122
 123static struct irq_chip arizona_irq_chip = {
 124        .name                   = "arizona",
 125        .irq_disable            = arizona_irq_disable,
 126        .irq_enable             = arizona_irq_enable,
 127};
 128
 129static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
 130                              irq_hw_number_t hw)
 131{
 132        struct regmap_irq_chip_data *data = h->host_data;
 133
 134        irq_set_chip_data(virq, data);
 135        irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
 136        irq_set_nested_thread(virq, 1);
 137
 138        /* ARM needs us to explicitly flag the IRQ as valid
 139         * and will set them noprobe when we do so. */
 140#ifdef CONFIG_ARM
 141        set_irq_flags(virq, IRQF_VALID);
 142#else
 143        irq_set_noprobe(virq);
 144#endif
 145
 146        return 0;
 147}
 148
 149static struct irq_domain_ops arizona_domain_ops = {
 150        .map    = arizona_irq_map,
 151        .xlate  = irq_domain_xlate_twocell,
 152};
 153
 154int arizona_irq_init(struct arizona *arizona)
 155{
 156        int flags = IRQF_ONESHOT;
 157        int ret, i;
 158        const struct regmap_irq_chip *aod, *irq;
 159
 160        switch (arizona->type) {
 161#ifdef CONFIG_MFD_WM5102
 162        case WM5102:
 163                aod = &wm5102_aod;
 164                irq = &wm5102_irq;
 165                break;
 166#endif
 167#ifdef CONFIG_MFD_WM5110
 168        case WM5110:
 169                aod = &wm5110_aod;
 170                irq = &wm5110_irq;
 171                break;
 172#endif
 173        default:
 174                BUG_ON("Unknown Arizona class device" == NULL);
 175                return -EINVAL;
 176        }
 177
 178        if (arizona->pdata.irq_active_high) {
 179                ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
 180                                         ARIZONA_IRQ_POL, 0);
 181                if (ret != 0) {
 182                        dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
 183                                ret);
 184                        goto err;
 185                }
 186
 187                flags |= IRQF_TRIGGER_HIGH;
 188        } else {
 189                flags |= IRQF_TRIGGER_LOW;
 190        }
 191
 192        /* Allocate a virtual IRQ domain to distribute to the regmap domains */
 193        arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
 194                                              arizona);
 195        if (!arizona->virq) {
 196                ret = -EINVAL;
 197                goto err;
 198        }
 199
 200        ret = regmap_add_irq_chip(arizona->regmap,
 201                                  irq_create_mapping(arizona->virq, 0),
 202                                  IRQF_ONESHOT, -1, aod,
 203                                  &arizona->aod_irq_chip);
 204        if (ret != 0) {
 205                dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 206                goto err_domain;
 207        }
 208
 209        ret = regmap_add_irq_chip(arizona->regmap,
 210                                  irq_create_mapping(arizona->virq, 1),
 211                                  IRQF_ONESHOT, -1, irq,
 212                                  &arizona->irq_chip);
 213        if (ret != 0) {
 214                dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 215                goto err_aod;
 216        }
 217
 218        /* Make sure the boot done IRQ is unmasked for resumes */
 219        i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
 220        ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
 221                                   "Boot done", arizona);
 222        if (ret != 0) {
 223                dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
 224                        arizona->irq, ret);
 225                goto err_boot_done;
 226        }
 227
 228        /* Handle control interface errors in the core */
 229        i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
 230        ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, IRQF_ONESHOT,
 231                                   "Control interface error", arizona);
 232        if (ret != 0) {
 233                dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
 234                        arizona->irq, ret);
 235                goto err_ctrlif;
 236        }
 237
 238        ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
 239                                   flags, "arizona", arizona);
 240
 241        if (ret != 0) {
 242                dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
 243                        arizona->irq, ret);
 244                goto err_main_irq;
 245        }
 246
 247        return 0;
 248
 249err_main_irq:
 250        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 251err_ctrlif:
 252        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 253err_boot_done:
 254        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 255                            arizona->irq_chip);
 256err_aod:
 257        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 258                            arizona->aod_irq_chip);
 259err_domain:
 260err:
 261        return ret;
 262}
 263
 264int arizona_irq_exit(struct arizona *arizona)
 265{
 266        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 267        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 268        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 269                            arizona->irq_chip);
 270        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 271                            arizona->aod_irq_chip);
 272        free_irq(arizona->irq, arizona);
 273
 274        return 0;
 275}
 276
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