drivers/mfd/wm8994-irq.c

   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
  31 static 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
 131 static 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
 143 static void wm8994_edge_irq_enable(struct irq_data *data)
 144 {
 145 }
 146
 147 static void wm8994_edge_irq_disable(struct irq_data *data)
 148 {
 149 }
 150
 151 static 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
 157 static 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
 167 static 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
 187 static struct irq_domain_ops wm8994_edge_irq_ops = {
 188         .map    = wm8994_edge_irq_map,
 189         .xlate  = irq_domain_xlate_twocell,
 190 };
 191
 192 int 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 EXPORT_SYMBOL(wm8994_irq_init);
 266
 267 void wm8994_irq_exit(struct wm8994 *wm8994)
 268 {
 269         regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
 270 }
 271 EXPORT_SYMBOL(wm8994_irq_exit);