drivers/mfd/max8998-irq.c

   1 /*
   2  * Interrupt controller support for MAX8998
   3  *
   4  * Copyright (C) 2010 Samsung Electronics Co.Ltd
   5  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/irq.h>
  17 #include <linux/mfd/max8998-private.h>
  18
  19 struct max8998_irq_data {
  20         int reg;
  21         int mask;
  22 };
  23
  24 static struct max8998_irq_data max8998_irqs[] = {
  25         [MAX8998_IRQ_DCINF] = {
  26                 .reg = 1,
  27                 .mask = MAX8998_IRQ_DCINF_MASK,
  28         },
  29         [MAX8998_IRQ_DCINR] = {
  30                 .reg = 1,
  31                 .mask = MAX8998_IRQ_DCINR_MASK,
  32         },
  33         [MAX8998_IRQ_JIGF] = {
  34                 .reg = 1,
  35                 .mask = MAX8998_IRQ_JIGF_MASK,
  36         },
  37         [MAX8998_IRQ_JIGR] = {
  38                 .reg = 1,
  39                 .mask = MAX8998_IRQ_JIGR_MASK,
  40         },
  41         [MAX8998_IRQ_PWRONF] = {
  42                 .reg = 1,
  43                 .mask = MAX8998_IRQ_PWRONF_MASK,
  44         },
  45         [MAX8998_IRQ_PWRONR] = {
  46                 .reg = 1,
  47                 .mask = MAX8998_IRQ_PWRONR_MASK,
  48         },
  49         [MAX8998_IRQ_WTSREVNT] = {
  50                 .reg = 2,
  51                 .mask = MAX8998_IRQ_WTSREVNT_MASK,
  52         },
  53         [MAX8998_IRQ_SMPLEVNT] = {
  54                 .reg = 2,
  55                 .mask = MAX8998_IRQ_SMPLEVNT_MASK,
  56         },
  57         [MAX8998_IRQ_ALARM1] = {
  58                 .reg = 2,
  59                 .mask = MAX8998_IRQ_ALARM1_MASK,
  60         },
  61         [MAX8998_IRQ_ALARM0] = {
  62                 .reg = 2,
  63                 .mask = MAX8998_IRQ_ALARM0_MASK,
  64         },
  65         [MAX8998_IRQ_ONKEY1S] = {
  66                 .reg = 3,
  67                 .mask = MAX8998_IRQ_ONKEY1S_MASK,
  68         },
  69         [MAX8998_IRQ_TOPOFFR] = {
  70                 .reg = 3,
  71                 .mask = MAX8998_IRQ_TOPOFFR_MASK,
  72         },
  73         [MAX8998_IRQ_DCINOVPR] = {
  74                 .reg = 3,
  75                 .mask = MAX8998_IRQ_DCINOVPR_MASK,
  76         },
  77         [MAX8998_IRQ_CHGRSTF] = {
  78                 .reg = 3,
  79                 .mask = MAX8998_IRQ_CHGRSTF_MASK,
  80         },
  81         [MAX8998_IRQ_DONER] = {
  82                 .reg = 3,
  83                 .mask = MAX8998_IRQ_DONER_MASK,
  84         },
  85         [MAX8998_IRQ_CHGFAULT] = {
  86                 .reg = 3,
  87                 .mask = MAX8998_IRQ_CHGFAULT_MASK,
  88         },
  89         [MAX8998_IRQ_LOBAT1] = {
  90                 .reg = 4,
  91                 .mask = MAX8998_IRQ_LOBAT1_MASK,
  92         },
  93         [MAX8998_IRQ_LOBAT2] = {
  94                 .reg = 4,
  95                 .mask = MAX8998_IRQ_LOBAT2_MASK,
  96         },
  97 };
  98
  99 static inline struct max8998_irq_data *
 100 irq_to_max8998_irq(struct max8998_dev *max8998, int irq)
 101 {
 102         return &max8998_irqs[irq - max8998->irq_base];
 103 }
 104
 105 static void max8998_irq_lock(unsigned int irq)
 106 {
 107         struct max8998_dev *max8998 = get_irq_chip_data(irq);
 108
 109         mutex_lock(&max8998->irqlock);
 110 }
 111
 112 static void max8998_irq_sync_unlock(unsigned int irq)
 113 {
 114         struct max8998_dev *max8998 = get_irq_chip_data(irq);
 115         int i;
 116
 117         for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
 118                 /*
 119                  * If there's been a change in the mask write it back
 120                  * to the hardware.
 121                  */
 122                 if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
 123                         max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
 124                         max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
 125                                         max8998->irq_masks_cur[i]);
 126                 }
 127         }
 128
 129         mutex_unlock(&max8998->irqlock);
 130 }
 131
 132 static void max8998_irq_unmask(unsigned int irq)
 133 {
 134         struct max8998_dev *max8998 = get_irq_chip_data(irq);
 135         struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq);
 136
 137         max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
 138 }
 139
 140 static void max8998_irq_mask(unsigned int irq)
 141 {
 142         struct max8998_dev *max8998 = get_irq_chip_data(irq);
 143         struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq);
 144
 145         max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
 146 }
 147
 148 static struct irq_chip max8998_irq_chip = {
 149         .name = "max8998",
 150         .bus_lock = max8998_irq_lock,
 151         .bus_sync_unlock = max8998_irq_sync_unlock,
 152         .mask = max8998_irq_mask,
 153         .unmask = max8998_irq_unmask,
 154 };
 155
 156 static irqreturn_t max8998_irq_thread(int irq, void *data)
 157 {
 158         struct max8998_dev *max8998 = data;
 159         u8 irq_reg[MAX8998_NUM_IRQ_REGS];
 160         int ret;
 161         int i;
 162
 163         ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
 164                         MAX8998_NUM_IRQ_REGS, irq_reg);
 165         if (ret < 0) {
 166                 dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
 167                                 ret);
 168                 return IRQ_NONE;
 169         }
 170
 171         /* Apply masking */
 172         for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
 173                 irq_reg[i] &= ~max8998->irq_masks_cur[i];
 174
 175         /* Report */
 176         for (i = 0; i < MAX8998_IRQ_NR; i++) {
 177                 if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask)
 178                         handle_nested_irq(max8998->irq_base + i);
 179         }
 180
 181         return IRQ_HANDLED;
 182 }
 183
 184 int max8998_irq_init(struct max8998_dev *max8998)
 185 {
 186         int i;
 187         int cur_irq;
 188         int ret;
 189
 190         if (!max8998->irq) {
 191                 dev_warn(max8998->dev,
 192                          "No interrupt specified, no interrupts\n");
 193                 max8998->irq_base = 0;
 194                 return 0;
 195         }
 196
 197         if (!max8998->irq_base) {
 198                 dev_err(max8998->dev,
 199                         "No interrupt base specified, no interrupts\n");
 200                 return 0;
 201         }
 202
 203         mutex_init(&max8998->irqlock);
 204
 205         /* Mask the individual interrupt sources */
 206         for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
 207                 max8998->irq_masks_cur[i] = 0xff;
 208                 max8998->irq_masks_cache[i] = 0xff;
 209                 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
 210         }
 211
 212         max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
 213         max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
 214
 215         /* register with genirq */
 216         for (i = 0; i < MAX8998_IRQ_NR; i++) {
 217                 cur_irq = i + max8998->irq_base;
 218                 set_irq_chip_data(cur_irq, max8998);
 219                 set_irq_chip_and_handler(cur_irq, &max8998_irq_chip,
 220                                          handle_edge_irq);
 221                 set_irq_nested_thread(cur_irq, 1);
 222 #ifdef CONFIG_ARM
 223                 set_irq_flags(cur_irq, IRQF_VALID);
 224 #else
 225                 set_irq_noprobe(cur_irq);
 226 #endif
 227         }
 228
 229         ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
 230                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 231                                    "max8998-irq", max8998);
 232         if (ret) {
 233                 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
 234                         max8998->irq, ret);
 235                 return ret;
 236         }
 237
 238         if (!max8998->ono)
 239                 return 0;
 240
 241         ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
 242                                    IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
 243                                    IRQF_ONESHOT, "max8998-ono", max8998);
 244         if (ret)
 245                 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
 246                         max8998->ono, ret);
 247
 248         return 0;
 249 }
 250
 251 void max8998_irq_exit(struct max8998_dev *max8998)
 252 {
 253         if (max8998->ono)
 254                 free_irq(max8998->ono, max8998);
 255
 256         if (max8998->irq)
 257                 free_irq(max8998->irq, max8998);
 258 }