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(struct irq_data *data) 106 { 107 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 108 109 mutex_lock(&max8998->irqlock); 110 } 111 112 static void max8998_irq_sync_unlock(struct irq_data *data) 113 { 114 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 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(struct irq_data *data) 133 { 134 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 135 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, 136 data->irq); 137 138 max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask; 139 } 140 141 static void max8998_irq_mask(struct irq_data *data) 142 { 143 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data); 144 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, 145 data->irq); 146 147 max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask; 148 } 149 150 static struct irq_chip max8998_irq_chip = { 151 .name = "max8998", 152 .irq_bus_lock = max8998_irq_lock, 153 .irq_bus_sync_unlock = max8998_irq_sync_unlock, 154 .irq_mask = max8998_irq_mask, 155 .irq_unmask = max8998_irq_unmask, 156 }; 157 158 static irqreturn_t max8998_irq_thread(int irq, void *data) 159 { 160 struct max8998_dev *max8998 = data; 161 u8 irq_reg[MAX8998_NUM_IRQ_REGS]; 162 int ret; 163 int i; 164 165 ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1, 166 MAX8998_NUM_IRQ_REGS, irq_reg); 167 if (ret < 0) { 168 dev_err(max8998->dev, "Failed to read interrupt register: %d\n", 169 ret); 170 return IRQ_NONE; 171 } 172 173 /* Apply masking */ 174 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) 175 irq_reg[i] &= ~max8998->irq_masks_cur[i]; 176 177 /* Report */ 178 for (i = 0; i < MAX8998_IRQ_NR; i++) { 179 if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) 180 handle_nested_irq(max8998->irq_base + i); 181 } 182 183 return IRQ_HANDLED; 184 } 185 186 int max8998_irq_resume(struct max8998_dev *max8998) 187 { 188 if (max8998->irq && max8998->irq_base) 189 max8998_irq_thread(max8998->irq_base, max8998); 190 return 0; 191 } 192 193 int max8998_irq_init(struct max8998_dev *max8998) 194 { 195 int i; 196 int cur_irq; 197 int ret; 198 199 if (!max8998->irq) { 200 dev_warn(max8998->dev, 201 "No interrupt specified, no interrupts\n"); 202 max8998->irq_base = 0; 203 return 0; 204 } 205 206 if (!max8998->irq_base) { 207 dev_err(max8998->dev, 208 "No interrupt base specified, no interrupts\n"); 209 return 0; 210 } 211 212 mutex_init(&max8998->irqlock); 213 214 /* Mask the individual interrupt sources */ 215 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) { 216 max8998->irq_masks_cur[i] = 0xff; 217 max8998->irq_masks_cache[i] = 0xff; 218 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff); 219 } 220 221 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff); 222 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff); 223 224 /* register with genirq */ 225 for (i = 0; i < MAX8998_IRQ_NR; i++) { 226 cur_irq = i + max8998->irq_base; 227 set_irq_chip_data(cur_irq, max8998); 228 set_irq_chip_and_handler(cur_irq, &max8998_irq_chip, 229 handle_edge_irq); 230 set_irq_nested_thread(cur_irq, 1); 231 #ifdef CONFIG_ARM 232 set_irq_flags(cur_irq, IRQF_VALID); 233 #else 234 set_irq_noprobe(cur_irq); 235 #endif 236 } 237 238 ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread, 239 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 240 "max8998-irq", max8998); 241 if (ret) { 242 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n", 243 max8998->irq, ret); 244 return ret; 245 } 246 247 if (!max8998->ono) 248 return 0; 249 250 ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread, 251 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 252 IRQF_ONESHOT, "max8998-ono", max8998); 253 if (ret) 254 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n", 255 max8998->ono, ret); 256 257 return 0; 258 } 259 260 void max8998_irq_exit(struct max8998_dev *max8998) 261 { 262 if (max8998->ono) 263 free_irq(max8998->ono, max8998); 264 265 if (max8998->irq) 266 free_irq(max8998->irq, max8998); 267 } 268