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/irqdomain.h> 18 #include <linux/mfd/max8998-private.h> 19 20 struct max8998_irq_data { 21 int reg; 22 int mask; 23 }; 24 25 static struct max8998_irq_data max8998_irqs[] = { 26 [MAX8998_IRQ_DCINF] = { 27 .reg = 1, 28 .mask = MAX8998_IRQ_DCINF_MASK, 29 }, 30 [MAX8998_IRQ_DCINR] = { 31 .reg = 1, 32 .mask = MAX8998_IRQ_DCINR_MASK, 33 }, 34 [MAX8998_IRQ_JIGF] = { 35 .reg = 1, 36 .mask = MAX8998_IRQ_JIGF_MASK, 37 }, 38 [MAX8998_IRQ_JIGR] = { 39 .reg = 1, 40 .mask = MAX8998_IRQ_JIGR_MASK, 41 }, 42 [MAX8998_IRQ_PWRONF] = { 43 .reg = 1, 44 .mask = MAX8998_IRQ_PWRONF_MASK, 45 }, 46 [MAX8998_IRQ_PWRONR] = { 47 .reg = 1, 48 .mask = MAX8998_IRQ_PWRONR_MASK, 49 }, 50 [MAX8998_IRQ_WTSREVNT] = { 51 .reg = 2, 52 .mask = MAX8998_IRQ_WTSREVNT_MASK, 53 }, 54 [MAX8998_IRQ_SMPLEVNT] = { 55 .reg = 2, 56 .mask = MAX8998_IRQ_SMPLEVNT_MASK, 57 }, 58 [MAX8998_IRQ_ALARM1] = { 59 .reg = 2, 60 .mask = MAX8998_IRQ_ALARM1_MASK, 61 }, 62 [MAX8998_IRQ_ALARM0] = { 63 .reg = 2, 64 .mask = MAX8998_IRQ_ALARM0_MASK, 65 }, 66 [MAX8998_IRQ_ONKEY1S] = { 67 .reg = 3, 68 .mask = MAX8998_IRQ_ONKEY1S_MASK, 69 }, 70 [MAX8998_IRQ_TOPOFFR] = { 71 .reg = 3, 72 .mask = MAX8998_IRQ_TOPOFFR_MASK, 73 }, 74 [MAX8998_IRQ_DCINOVPR] = { 75 .reg = 3, 76 .mask = MAX8998_IRQ_DCINOVPR_MASK, 77 }, 78 [MAX8998_IRQ_CHGRSTF] = { 79 .reg = 3, 80 .mask = MAX8998_IRQ_CHGRSTF_MASK, 81 }, 82 [MAX8998_IRQ_DONER] = { 83 .reg = 3, 84 .mask = MAX8998_IRQ_DONER_MASK, 85 }, 86 [MAX8998_IRQ_CHGFAULT] = { 87 .reg = 3, 88 .mask = MAX8998_IRQ_CHGFAULT_MASK, 89 }, 90 [MAX8998_IRQ_LOBAT1] = { 91 .reg = 4, 92 .mask = MAX8998_IRQ_LOBAT1_MASK, 93 }, 94 [MAX8998_IRQ_LOBAT2] = { 95 .reg = 4, 96 .mask = MAX8998_IRQ_LOBAT2_MASK, 97 }, 98 }; 99 100 static inline struct max8998_irq_data * 101 irq_to_max8998_irq(struct max8998_dev *max8998, int irq) 102 { 103 struct irq_data *data = irq_get_irq_data(irq); 104 return &max8998_irqs[data->hwirq]; 105 } 106 107 static void max8998_irq_lock(struct irq_data *data) 108 { 109 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 110 111 mutex_lock(&max8998->irqlock); 112 } 113 114 static void max8998_irq_sync_unlock(struct irq_data *data) 115 { 116 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 117 int i; 118 119 for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) { 120 /* 121 * If there's been a change in the mask write it back 122 * to the hardware. 123 */ 124 if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) { 125 max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i]; 126 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 127 max8998->irq_masks_cur[i]); 128 } 129 } 130 131 mutex_unlock(&max8998->irqlock); 132 } 133 134 static void max8998_irq_unmask(struct irq_data *data) 135 { 136 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 137 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, 138 data->irq); 139 140 max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask; 141 } 142 143 static void max8998_irq_mask(struct irq_data *data) 144 { 145 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 146 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, 147 data->irq); 148 149 max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask; 150 } 151 152 static struct irq_chip max8998_irq_chip = { 153 .name = "max8998", 154 .irq_bus_lock = max8998_irq_lock, 155 .irq_bus_sync_unlock = max8998_irq_sync_unlock, 156 .irq_mask = max8998_irq_mask, 157 .irq_unmask = max8998_irq_unmask, 158 }; 159 160 static irqreturn_t max8998_irq_thread(int irq, void *data) 161 { 162 struct max8998_dev *max8998 = data; 163 u8 irq_reg[MAX8998_NUM_IRQ_REGS]; 164 int ret; 165 int i; 166 167 ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1, 168 MAX8998_NUM_IRQ_REGS, irq_reg); 169 if (ret < 0) { 170 dev_err(max8998->dev, "Failed to read interrupt register: %d\n", 171 ret); 172 return IRQ_NONE; 173 } 174 175 /* Apply masking */ 176 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) 177 irq_reg[i] &= ~max8998->irq_masks_cur[i]; 178 179 /* Report */ 180 for (i = 0; i < MAX8998_IRQ_NR; i++) { 181 if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) { 182 irq = irq_find_mapping(max8998->irq_domain, i); 183 if (WARN_ON(!irq)) { 184 disable_irq_nosync(max8998->irq); 185 return IRQ_NONE; 186 } 187 handle_nested_irq(irq); 188 } 189 } 190 191 return IRQ_HANDLED; 192 } 193 194 int max8998_irq_resume(struct max8998_dev *max8998) 195 { 196 if (max8998->irq && max8998->irq_domain) 197 max8998_irq_thread(max8998->irq, max8998); 198 return 0; 199 } 200 201 static int max8998_irq_domain_map(struct irq_domain *d, unsigned int irq, 202 irq_hw_number_t hw) 203 { 204 struct max8997_dev *max8998 = d->host_data; 205 206 irq_set_chip_data(irq, max8998); 207 irq_set_chip_and_handler(irq, &max8998_irq_chip, handle_edge_irq); 208 irq_set_nested_thread(irq, 1); 209 #ifdef CONFIG_ARM 210 set_irq_flags(irq, IRQF_VALID); 211 #else 212 irq_set_noprobe(irq); 213 #endif 214 return 0; 215 } 216 217 static struct irq_domain_ops max8998_irq_domain_ops = { 218 .map = max8998_irq_domain_map, 219 }; 220 221 int max8998_irq_init(struct max8998_dev *max8998) 222 { 223 int i; 224 int ret; 225 struct irq_domain *domain; 226 227 if (!max8998->irq) { 228 dev_warn(max8998->dev, 229 "No interrupt specified, no interrupts\n"); 230 return 0; 231 } 232 233 mutex_init(&max8998->irqlock); 234 235 /* Mask the individual interrupt sources */ 236 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) { 237 max8998->irq_masks_cur[i] = 0xff; 238 max8998->irq_masks_cache[i] = 0xff; 239 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff); 240 } 241 242 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff); 243 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff); 244 245 domain = irq_domain_add_simple(NULL, MAX8998_IRQ_NR, 246 max8998->irq_base, &max8998_irq_domain_ops, max8998); 247 if (!domain) { 248 dev_err(max8998->dev, "could not create irq domain\n"); 249 return -ENODEV; 250 } 251 max8998->irq_domain = domain; 252 253 ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread, 254 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 255 "max8998-irq", max8998); 256 if (ret) { 257 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n", 258 max8998->irq, ret); 259 return ret; 260 } 261 262 if (!max8998->ono) 263 return 0; 264 265 ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread, 266 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 267 IRQF_ONESHOT, "max8998-ono", max8998); 268 if (ret) 269 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n", 270 max8998->ono, ret); 271 272 return 0; 273 } 274 275 void max8998_irq_exit(struct max8998_dev *max8998) 276 { 277 if (max8998->ono) 278 free_irq(max8998->ono, max8998); 279 280 if (max8998->irq) 281 free_irq(max8998->irq, max8998); 282 } 283