drivers/mfd/wm8994-irq.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm8994-irq.c  --  Interrupt controller support for Wolfson WM8994
   4  *
   5  * Copyright 2010 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/gpio.h>
  13 #include <linux/i2c.h>
  14 #include <linux/irq.h>
  15 #include <linux/mfd/core.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irqdomain.h>
  18 #include <linux/regmap.h>
  19
  20 #include <linux/mfd/wm8994/core.h>
  21 #include <linux/mfd/wm8994/pdata.h>
  22 #include <linux/mfd/wm8994/registers.h>
  23
  24 #include <linux/delay.h>
  25
  26 static const struct regmap_irq wm8994_irqs[] = {
  27         [WM8994_IRQ_TEMP_SHUT] = {
  28                 .reg_offset = 1,
  29                 .mask = WM8994_TEMP_SHUT_EINT,
  30         },
  31         [WM8994_IRQ_MIC1_DET] = {
  32                 .reg_offset = 1,
  33                 .mask = WM8994_MIC1_DET_EINT,
  34         },
  35         [WM8994_IRQ_MIC1_SHRT] = {
  36                 .reg_offset = 1,
  37                 .mask = WM8994_MIC1_SHRT_EINT,
  38         },
  39         [WM8994_IRQ_MIC2_DET] = {
  40                 .reg_offset = 1,
  41                 .mask = WM8994_MIC2_DET_EINT,
  42         },
  43         [WM8994_IRQ_MIC2_SHRT] = {
  44                 .reg_offset = 1,
  45                 .mask = WM8994_MIC2_SHRT_EINT,
  46         },
  47         [WM8994_IRQ_FLL1_LOCK] = {
  48                 .reg_offset = 1,
  49                 .mask = WM8994_FLL1_LOCK_EINT,
  50         },
  51         [WM8994_IRQ_FLL2_LOCK] = {
  52                 .reg_offset = 1,
  53                 .mask = WM8994_FLL2_LOCK_EINT,
  54         },
  55         [WM8994_IRQ_SRC1_LOCK] = {
  56                 .reg_offset = 1,
  57                 .mask = WM8994_SRC1_LOCK_EINT,
  58         },
  59         [WM8994_IRQ_SRC2_LOCK] = {
  60                 .reg_offset = 1,
  61                 .mask = WM8994_SRC2_LOCK_EINT,
  62         },
  63         [WM8994_IRQ_AIF1DRC1_SIG_DET] = {
  64                 .reg_offset = 1,
  65                 .mask = WM8994_AIF1DRC1_SIG_DET,
  66         },
  67         [WM8994_IRQ_AIF1DRC2_SIG_DET] = {
  68                 .reg_offset = 1,
  69                 .mask = WM8994_AIF1DRC2_SIG_DET_EINT,
  70         },
  71         [WM8994_IRQ_AIF2DRC_SIG_DET] = {
  72                 .reg_offset = 1,
  73                 .mask = WM8994_AIF2DRC_SIG_DET_EINT,
  74         },
  75         [WM8994_IRQ_FIFOS_ERR] = {
  76                 .reg_offset = 1,
  77                 .mask = WM8994_FIFOS_ERR_EINT,
  78         },
  79         [WM8994_IRQ_WSEQ_DONE] = {
  80                 .reg_offset = 1,
  81                 .mask = WM8994_WSEQ_DONE_EINT,
  82         },
  83         [WM8994_IRQ_DCS_DONE] = {
  84                 .reg_offset = 1,
  85                 .mask = WM8994_DCS_DONE_EINT,
  86         },
  87         [WM8994_IRQ_TEMP_WARN] = {
  88                 .reg_offset = 1,
  89                 .mask = WM8994_TEMP_WARN_EINT,
  90         },
  91         [WM8994_IRQ_GPIO(1)] = {
  92                 .mask = WM8994_GP1_EINT,
  93         },
  94         [WM8994_IRQ_GPIO(2)] = {
  95                 .mask = WM8994_GP2_EINT,
  96         },
  97         [WM8994_IRQ_GPIO(3)] = {
  98                 .mask = WM8994_GP3_EINT,
  99         },
 100         [WM8994_IRQ_GPIO(4)] = {
 101                 .mask = WM8994_GP4_EINT,
 102         },
 103         [WM8994_IRQ_GPIO(5)] = {
 104                 .mask = WM8994_GP5_EINT,
 105         },
 106         [WM8994_IRQ_GPIO(6)] = {
 107                 .mask = WM8994_GP6_EINT,
 108         },
 109         [WM8994_IRQ_GPIO(7)] = {
 110                 .mask = WM8994_GP7_EINT,
 111         },
 112         [WM8994_IRQ_GPIO(8)] = {
 113                 .mask = WM8994_GP8_EINT,
 114         },
 115         [WM8994_IRQ_GPIO(9)] = {
 116                 .mask = WM8994_GP8_EINT,
 117         },
 118         [WM8994_IRQ_GPIO(10)] = {
 119                 .mask = WM8994_GP10_EINT,
 120         },
 121         [WM8994_IRQ_GPIO(11)] = {
 122                 .mask = WM8994_GP11_EINT,
 123         },
 124 };
 125
 126 static const struct regmap_irq_chip wm8994_irq_chip = {
 127         .name = "wm8994",
 128         .irqs = wm8994_irqs,
 129         .num_irqs = ARRAY_SIZE(wm8994_irqs),
 130
 131         .num_regs = 2,
 132         .status_base = WM8994_INTERRUPT_STATUS_1,
 133         .mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
 134         .ack_base = WM8994_INTERRUPT_STATUS_1,
 135         .runtime_pm = true,
 136 };
 137
 138 static void wm8994_edge_irq_enable(struct irq_data *data)
 139 {
 140 }
 141
 142 static void wm8994_edge_irq_disable(struct irq_data *data)
 143 {
 144 }
 145
 146 static struct irq_chip wm8994_edge_irq_chip = {
 147         .name                   = "wm8994_edge",
 148         .irq_disable            = wm8994_edge_irq_disable,
 149         .irq_enable             = wm8994_edge_irq_enable,
 150 };
 151
 152 static irqreturn_t wm8994_edge_irq(int irq, void *data)
 153 {
 154         struct wm8994 *wm8994 = data;
 155
 156         while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
 157                 handle_nested_irq(irq_find_mapping(wm8994->edge_irq, 0));
 158
 159         return IRQ_HANDLED;
 160 }
 161
 162 static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq,
 163                                irq_hw_number_t hw)
 164 {
 165         struct wm8994 *wm8994 = h->host_data;
 166
 167         irq_set_chip_data(virq, wm8994);
 168         irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq);
 169         irq_set_nested_thread(virq, 1);
 170         irq_set_noprobe(virq);
 171
 172         return 0;
 173 }
 174
 175 static const struct irq_domain_ops wm8994_edge_irq_ops = {
 176         .map    = wm8994_edge_irq_map,
 177         .xlate  = irq_domain_xlate_twocell,
 178 };
 179
 180 int wm8994_irq_init(struct wm8994 *wm8994)
 181 {
 182         int ret;
 183         unsigned long irqflags;
 184         struct wm8994_pdata *pdata = &wm8994->pdata;
 185
 186         if (!wm8994->irq) {
 187                 dev_warn(wm8994->dev,
 188                          "No interrupt specified, no interrupts\n");
 189                 wm8994->irq_base = 0;
 190                 return 0;
 191         }
 192
 193         /* select user or default irq flags */
 194         irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
 195         if (pdata->irq_flags)
 196                 irqflags = pdata->irq_flags;
 197
 198         /* use a GPIO for edge triggered controllers */
 199         if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
 200                 if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) {
 201                         dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n",
 202                                  wm8994->irq, pdata->irq_gpio,
 203                                  gpio_to_irq(pdata->irq_gpio));
 204                         wm8994->irq = gpio_to_irq(pdata->irq_gpio);
 205                 }
 206
 207                 ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio,
 208                                             GPIOF_IN, "WM8994 IRQ");
 209
 210                 if (ret != 0) {
 211                         dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n",
 212                                 ret);
 213                         return ret;
 214                 }
 215
 216                 wm8994->edge_irq = irq_domain_add_linear(NULL, 1,
 217                                                          &wm8994_edge_irq_ops,
 218                                                          wm8994);
 219
 220                 ret = regmap_add_irq_chip(wm8994->regmap,
 221                                           irq_create_mapping(wm8994->edge_irq,
 222                                                              0),
 223                                           IRQF_ONESHOT,
 224                                           wm8994->irq_base, &wm8994_irq_chip,
 225                                           &wm8994->irq_data);
 226                 if (ret != 0) {
 227                         dev_err(wm8994->dev, "Failed to get IRQ: %d\n",
 228                                 ret);
 229                         return ret;
 230                 }
 231
 232                 ret = request_threaded_irq(wm8994->irq,
 233                                            NULL, wm8994_edge_irq,
 234                                            irqflags,
 235                                            "WM8994 edge", wm8994);
 236         } else {
 237                 ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
 238                                           irqflags,
 239                                           wm8994->irq_base, &wm8994_irq_chip,
 240                                           &wm8994->irq_data);
 241         }
 242
 243         if (ret != 0) {
 244                 dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
 245                 return ret;
 246         }
 247
 248         /* Enable top level interrupt if it was masked */
 249         wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
 250
 251         return 0;
 252 }
 253 EXPORT_SYMBOL(wm8994_irq_init);
 254
 255 void wm8994_irq_exit(struct wm8994 *wm8994)
 256 {
 257         regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
 258 }
 259 EXPORT_SYMBOL(wm8994_irq_exit);