drivers/mfd/max77693-irq.c

   1 /*
   2  * max77693-irq.c - Interrupt controller support for MAX77693
   3  *
   4  * Copyright (C) 2012 Samsung Electronics Co.Ltd
   5  * SangYoung Son <hello.son@samsung.com>
   6  *
   7  * This program is not provided / owned by Maxim Integrated Products.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * This driver is based on max8997-irq.c
  24  */
  25
  26 #include <linux/err.h>
  27 #include <linux/irq.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/module.h>
  30 #include <linux/irqdomain.h>
  31 #include <linux/mfd/max77693.h>
  32 #include <linux/mfd/max77693-private.h>
  33
  34 static const u8 max77693_mask_reg[] = {
  35         [LED_INT] = MAX77693_LED_REG_FLASH_INT_MASK,
  36         [TOPSYS_INT] = MAX77693_PMIC_REG_TOPSYS_INT_MASK,
  37         [CHG_INT] = MAX77693_CHG_REG_CHG_INT_MASK,
  38         [MUIC_INT1] = MAX77693_MUIC_REG_INTMASK1,
  39         [MUIC_INT2] = MAX77693_MUIC_REG_INTMASK2,
  40         [MUIC_INT3] = MAX77693_MUIC_REG_INTMASK3,
  41 };
  42
  43 static struct regmap *max77693_get_regmap(struct max77693_dev *max77693,
  44                                 enum max77693_irq_source src)
  45 {
  46         switch (src) {
  47         case LED_INT ... CHG_INT:
  48                 return max77693->regmap;
  49         case MUIC_INT1 ... MUIC_INT3:
  50                 return max77693->regmap_muic;
  51         default:
  52                 return ERR_PTR(-EINVAL);
  53         }
  54 }
  55
  56 struct max77693_irq_data {
  57         int mask;
  58         enum max77693_irq_source group;
  59 };
  60
  61 #define DECLARE_IRQ(idx, _group, _mask)         \
  62         [(idx)] = { .group = (_group), .mask = (_mask) }
  63 static const struct max77693_irq_data max77693_irqs[] = {
  64         DECLARE_IRQ(MAX77693_LED_IRQ_FLED2_OPEN,        LED_INT, 1 << 0),
  65         DECLARE_IRQ(MAX77693_LED_IRQ_FLED2_SHORT,       LED_INT, 1 << 1),
  66         DECLARE_IRQ(MAX77693_LED_IRQ_FLED1_OPEN,        LED_INT, 1 << 2),
  67         DECLARE_IRQ(MAX77693_LED_IRQ_FLED1_SHORT,       LED_INT, 1 << 3),
  68         DECLARE_IRQ(MAX77693_LED_IRQ_MAX_FLASH,         LED_INT, 1 << 4),
  69
  70         DECLARE_IRQ(MAX77693_TOPSYS_IRQ_T120C_INT,      TOPSYS_INT, 1 << 0),
  71         DECLARE_IRQ(MAX77693_TOPSYS_IRQ_T140C_INT,      TOPSYS_INT, 1 << 1),
  72         DECLARE_IRQ(MAX77693_TOPSYS_IRQ_LOWSYS_INT,     TOPSYS_INT, 1 << 3),
  73
  74         DECLARE_IRQ(MAX77693_CHG_IRQ_BYP_I,             CHG_INT, 1 << 0),
  75         DECLARE_IRQ(MAX77693_CHG_IRQ_THM_I,             CHG_INT, 1 << 2),
  76         DECLARE_IRQ(MAX77693_CHG_IRQ_BAT_I,             CHG_INT, 1 << 3),
  77         DECLARE_IRQ(MAX77693_CHG_IRQ_CHG_I,             CHG_INT, 1 << 4),
  78         DECLARE_IRQ(MAX77693_CHG_IRQ_CHGIN_I,           CHG_INT, 1 << 6),
  79
  80         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC,         MUIC_INT1, 1 << 0),
  81         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC_LOW,     MUIC_INT1, 1 << 1),
  82         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC_ERR,     MUIC_INT1, 1 << 2),
  83         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC1K,       MUIC_INT1, 1 << 3),
  84
  85         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_CHGTYP,      MUIC_INT2, 1 << 0),
  86         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_CHGDETREUN,  MUIC_INT2, 1 << 1),
  87         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_DCDTMR,      MUIC_INT2, 1 << 2),
  88         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_DXOVP,       MUIC_INT2, 1 << 3),
  89         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_VBVOLT,      MUIC_INT2, 1 << 4),
  90         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_VIDRM,       MUIC_INT2, 1 << 5),
  91
  92         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_EOC,         MUIC_INT3, 1 << 0),
  93         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_CGMBC,       MUIC_INT3, 1 << 1),
  94         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_OVP,         MUIC_INT3, 1 << 2),
  95         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR,  MUIC_INT3, 1 << 3),
  96         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_CHG_ENABLED, MUIC_INT3, 1 << 4),
  97         DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_BAT_DET,     MUIC_INT3, 1 << 5),
  98 };
  99
 100 static void max77693_irq_lock(struct irq_data *data)
 101 {
 102         struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
 103
 104         mutex_lock(&max77693->irqlock);
 105 }
 106
 107 static void max77693_irq_sync_unlock(struct irq_data *data)
 108 {
 109         struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
 110         int i;
 111
 112         for (i = 0; i < MAX77693_IRQ_GROUP_NR; i++) {
 113                 u8 mask_reg = max77693_mask_reg[i];
 114                 struct regmap *map = max77693_get_regmap(max77693, i);
 115
 116                 if (mask_reg == MAX77693_REG_INVALID ||
 117                                 IS_ERR_OR_NULL(map))
 118                         continue;
 119                 max77693->irq_masks_cache[i] = max77693->irq_masks_cur[i];
 120
 121                 max77693_write_reg(map, max77693_mask_reg[i],
 122                                 max77693->irq_masks_cur[i]);
 123         }
 124
 125         mutex_unlock(&max77693->irqlock);
 126 }
 127
 128 static const inline struct max77693_irq_data *
 129 irq_to_max77693_irq(struct max77693_dev *max77693, int irq)
 130 {
 131         return &max77693_irqs[irq];
 132 }
 133
 134 static void max77693_irq_mask(struct irq_data *data)
 135 {
 136         struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
 137         const struct max77693_irq_data *irq_data =
 138                                 irq_to_max77693_irq(max77693, data->irq);
 139
 140         if (irq_data->group >= MUIC_INT1 && irq_data->group <= MUIC_INT3)
 141                 max77693->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
 142         else
 143                 max77693->irq_masks_cur[irq_data->group] |= irq_data->mask;
 144 }
 145
 146 static void max77693_irq_unmask(struct irq_data *data)
 147 {
 148         struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
 149         const struct max77693_irq_data *irq_data =
 150             irq_to_max77693_irq(max77693, data->irq);
 151
 152         if (irq_data->group >= MUIC_INT1 && irq_data->group <= MUIC_INT3)
 153                 max77693->irq_masks_cur[irq_data->group] |= irq_data->mask;
 154         else
 155                 max77693->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
 156 }
 157
 158 static struct irq_chip max77693_irq_chip = {
 159         .name                   = "max77693",
 160         .irq_bus_lock           = max77693_irq_lock,
 161         .irq_bus_sync_unlock    = max77693_irq_sync_unlock,
 162         .irq_mask               = max77693_irq_mask,
 163         .irq_unmask             = max77693_irq_unmask,
 164 };
 165
 166 #define MAX77693_IRQSRC_CHG             (1 << 0)
 167 #define MAX77693_IRQSRC_TOP             (1 << 1)
 168 #define MAX77693_IRQSRC_FLASH           (1 << 2)
 169 #define MAX77693_IRQSRC_MUIC            (1 << 3)
 170 static irqreturn_t max77693_irq_thread(int irq, void *data)
 171 {
 172         struct max77693_dev *max77693 = data;
 173         u8 irq_reg[MAX77693_IRQ_GROUP_NR] = {};
 174         u8 irq_src;
 175         int ret;
 176         int i, cur_irq;
 177
 178         ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_INTSRC,
 179                                 &irq_src);
 180         if (ret < 0) {
 181                 dev_err(max77693->dev, "Failed to read interrupt source: %d\n",
 182                                 ret);
 183                 return IRQ_NONE;
 184         }
 185
 186         if (irq_src & MAX77693_IRQSRC_CHG)
 187                 /* CHG_INT */
 188                 ret = max77693_read_reg(max77693->regmap, MAX77693_CHG_REG_CHG_INT,
 189                                 &irq_reg[CHG_INT]);
 190
 191         if (irq_src & MAX77693_IRQSRC_TOP)
 192                 /* TOPSYS_INT */
 193                 ret = max77693_read_reg(max77693->regmap,
 194                         MAX77693_PMIC_REG_TOPSYS_INT, &irq_reg[TOPSYS_INT]);
 195
 196         if (irq_src & MAX77693_IRQSRC_FLASH)
 197                 /* LED_INT */
 198                 ret = max77693_read_reg(max77693->regmap,
 199                         MAX77693_LED_REG_FLASH_INT, &irq_reg[LED_INT]);
 200
 201         if (irq_src & MAX77693_IRQSRC_MUIC)
 202                 /* MUIC INT1 ~ INT3 */
 203                 max77693_bulk_read(max77693->regmap, MAX77693_MUIC_REG_INT1,
 204                         MAX77693_NUM_IRQ_MUIC_REGS, &irq_reg[MUIC_INT1]);
 205
 206         /* Apply masking */
 207         for (i = 0; i < MAX77693_IRQ_GROUP_NR; i++) {
 208                 if (i >= MUIC_INT1 && i <= MUIC_INT3)
 209                         irq_reg[i] &= max77693->irq_masks_cur[i];
 210                 else
 211                         irq_reg[i] &= ~max77693->irq_masks_cur[i];
 212         }
 213
 214         /* Report */
 215         for (i = 0; i < MAX77693_IRQ_NR; i++) {
 216                 if (irq_reg[max77693_irqs[i].group] & max77693_irqs[i].mask) {
 217                         cur_irq = irq_find_mapping(max77693->irq_domain, i);
 218                         if (cur_irq)
 219                                 handle_nested_irq(cur_irq);
 220                 }
 221         }
 222
 223         return IRQ_HANDLED;
 224 }
 225
 226 int max77693_irq_resume(struct max77693_dev *max77693)
 227 {
 228         if (max77693->irq)
 229                 max77693_irq_thread(0, max77693);
 230
 231         return 0;
 232 }
 233
 234 static int max77693_irq_domain_map(struct irq_domain *d, unsigned int irq,
 235                                 irq_hw_number_t hw)
 236 {
 237         struct max77693_dev *max77693 = d->host_data;
 238
 239         irq_set_chip_data(irq, max77693);
 240         irq_set_chip_and_handler(irq, &max77693_irq_chip, handle_edge_irq);
 241         irq_set_nested_thread(irq, 1);
 242 #ifdef CONFIG_ARM
 243         set_irq_flags(irq, IRQF_VALID);
 244 #else
 245         irq_set_noprobe(irq);
 246 #endif
 247         return 0;
 248 }
 249
 250 static struct irq_domain_ops max77693_irq_domain_ops = {
 251         .map = max77693_irq_domain_map,
 252 };
 253
 254 int max77693_irq_init(struct max77693_dev *max77693)
 255 {
 256         struct irq_domain *domain;
 257         int i;
 258         int ret;
 259
 260         mutex_init(&max77693->irqlock);
 261
 262         /* Mask individual interrupt sources */
 263         for (i = 0; i < MAX77693_IRQ_GROUP_NR; i++) {
 264                 struct regmap *map;
 265                 /* MUIC IRQ  0:MASK 1:NOT MASK */
 266                 /* Other IRQ 1:MASK 0:NOT MASK */
 267                 if (i >= MUIC_INT1 && i <= MUIC_INT3) {
 268                         max77693->irq_masks_cur[i] = 0x00;
 269                         max77693->irq_masks_cache[i] = 0x00;
 270                 } else {
 271                         max77693->irq_masks_cur[i] = 0xff;
 272                         max77693->irq_masks_cache[i] = 0xff;
 273                 }
 274                 map = max77693_get_regmap(max77693, i);
 275
 276                 if (IS_ERR_OR_NULL(map))
 277                         continue;
 278                 if (max77693_mask_reg[i] == MAX77693_REG_INVALID)
 279                         continue;
 280                 if (i >= MUIC_INT1 && i <= MUIC_INT3)
 281                         max77693_write_reg(map, max77693_mask_reg[i], 0x00);
 282                 else
 283                         max77693_write_reg(map, max77693_mask_reg[i], 0xff);
 284         }
 285
 286         domain = irq_domain_add_linear(NULL, MAX77693_IRQ_NR,
 287                                         &max77693_irq_domain_ops, max77693);
 288         if (!domain) {
 289                 dev_err(max77693->dev, "could not create irq domain\n");
 290                 return -ENODEV;
 291         }
 292         max77693->irq_domain = domain;
 293
 294         ret = request_threaded_irq(max77693->irq, NULL, max77693_irq_thread,
 295                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 296                                    "max77693-irq", max77693);
 297
 298         if (ret)
 299                 dev_err(max77693->dev, "Failed to request IRQ %d: %d\n",
 300                         max77693->irq, ret);
 301
 302         return 0;
 303 }
 304
 305 void max77693_irq_exit(struct max77693_dev *max77693)
 306 {
 307         if (max77693->irq)
 308                 free_irq(max77693->irq, max77693);
 309 }