1 /* 2 * wm8994-irq.c -- Interrupt controller support for Wolfson WM8994 3 * 4 * Copyright 2010 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/gpio.h> 18 #include <linux/i2c.h> 19 #include <linux/irq.h> 20 #include <linux/mfd/core.h> 21 #include <linux/interrupt.h> 22 #include <linux/irqdomain.h> 23 #include <linux/regmap.h> 24 25 #include <linux/mfd/wm8994/core.h> 26 #include <linux/mfd/wm8994/pdata.h> 27 #include <linux/mfd/wm8994/registers.h> 28 29 #include <linux/delay.h> 30 31 static struct regmap_irq wm8994_irqs[] = { 32 [WM8994_IRQ_TEMP_SHUT] = { 33 .reg_offset = 1, 34 .mask = WM8994_TEMP_SHUT_EINT, 35 }, 36 [WM8994_IRQ_MIC1_DET] = { 37 .reg_offset = 1, 38 .mask = WM8994_MIC1_DET_EINT, 39 }, 40 [WM8994_IRQ_MIC1_SHRT] = { 41 .reg_offset = 1, 42 .mask = WM8994_MIC1_SHRT_EINT, 43 }, 44 [WM8994_IRQ_MIC2_DET] = { 45 .reg_offset = 1, 46 .mask = WM8994_MIC2_DET_EINT, 47 }, 48 [WM8994_IRQ_MIC2_SHRT] = { 49 .reg_offset = 1, 50 .mask = WM8994_MIC2_SHRT_EINT, 51 }, 52 [WM8994_IRQ_FLL1_LOCK] = { 53 .reg_offset = 1, 54 .mask = WM8994_FLL1_LOCK_EINT, 55 }, 56 [WM8994_IRQ_FLL2_LOCK] = { 57 .reg_offset = 1, 58 .mask = WM8994_FLL2_LOCK_EINT, 59 }, 60 [WM8994_IRQ_SRC1_LOCK] = { 61 .reg_offset = 1, 62 .mask = WM8994_SRC1_LOCK_EINT, 63 }, 64 [WM8994_IRQ_SRC2_LOCK] = { 65 .reg_offset = 1, 66 .mask = WM8994_SRC2_LOCK_EINT, 67 }, 68 [WM8994_IRQ_AIF1DRC1_SIG_DET] = { 69 .reg_offset = 1, 70 .mask = WM8994_AIF1DRC1_SIG_DET, 71 }, 72 [WM8994_IRQ_AIF1DRC2_SIG_DET] = { 73 .reg_offset = 1, 74 .mask = WM8994_AIF1DRC2_SIG_DET_EINT, 75 }, 76 [WM8994_IRQ_AIF2DRC_SIG_DET] = { 77 .reg_offset = 1, 78 .mask = WM8994_AIF2DRC_SIG_DET_EINT, 79 }, 80 [WM8994_IRQ_FIFOS_ERR] = { 81 .reg_offset = 1, 82 .mask = WM8994_FIFOS_ERR_EINT, 83 }, 84 [WM8994_IRQ_WSEQ_DONE] = { 85 .reg_offset = 1, 86 .mask = WM8994_WSEQ_DONE_EINT, 87 }, 88 [WM8994_IRQ_DCS_DONE] = { 89 .reg_offset = 1, 90 .mask = WM8994_DCS_DONE_EINT, 91 }, 92 [WM8994_IRQ_TEMP_WARN] = { 93 .reg_offset = 1, 94 .mask = WM8994_TEMP_WARN_EINT, 95 }, 96 [WM8994_IRQ_GPIO(1)] = { 97 .mask = WM8994_GP1_EINT, 98 }, 99 [WM8994_IRQ_GPIO(2)] = { 100 .mask = WM8994_GP2_EINT, 101 }, 102 [WM8994_IRQ_GPIO(3)] = { 103 .mask = WM8994_GP3_EINT, 104 }, 105 [WM8994_IRQ_GPIO(4)] = { 106 .mask = WM8994_GP4_EINT, 107 }, 108 [WM8994_IRQ_GPIO(5)] = { 109 .mask = WM8994_GP5_EINT, 110 }, 111 [WM8994_IRQ_GPIO(6)] = { 112 .mask = WM8994_GP6_EINT, 113 }, 114 [WM8994_IRQ_GPIO(7)] = { 115 .mask = WM8994_GP7_EINT, 116 }, 117 [WM8994_IRQ_GPIO(8)] = { 118 .mask = WM8994_GP8_EINT, 119 }, 120 [WM8994_IRQ_GPIO(9)] = { 121 .mask = WM8994_GP8_EINT, 122 }, 123 [WM8994_IRQ_GPIO(10)] = { 124 .mask = WM8994_GP10_EINT, 125 }, 126 [WM8994_IRQ_GPIO(11)] = { 127 .mask = WM8994_GP11_EINT, 128 }, 129 }; 130 131 static struct regmap_irq_chip wm8994_irq_chip = { 132 .name = "wm8994", 133 .irqs = wm8994_irqs, 134 .num_irqs = ARRAY_SIZE(wm8994_irqs), 135 136 .num_regs = 2, 137 .status_base = WM8994_INTERRUPT_STATUS_1, 138 .mask_base = WM8994_INTERRUPT_STATUS_1_MASK, 139 .ack_base = WM8994_INTERRUPT_STATUS_1, 140 .runtime_pm = true, 141 }; 142 143 static void wm8994_edge_irq_enable(struct irq_data *data) 144 { 145 } 146 147 static void wm8994_edge_irq_disable(struct irq_data *data) 148 { 149 } 150 151 static struct irq_chip wm8994_edge_irq_chip = { 152 .name = "wm8994_edge", 153 .irq_disable = wm8994_edge_irq_disable, 154 .irq_enable = wm8994_edge_irq_enable, 155 }; 156 157 static irqreturn_t wm8994_edge_irq(int irq, void *data) 158 { 159 struct wm8994 *wm8994 = data; 160 161 while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio)) 162 handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0)); 163 164 return IRQ_HANDLED; 165 } 166 167 static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq, 168 irq_hw_number_t hw) 169 { 170 struct wm8994 *wm8994 = h->host_data; 171 172 irq_set_chip_data(virq, wm8994); 173 irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq); 174 irq_set_nested_thread(virq, 1); 175 176 /* ARM needs us to explicitly flag the IRQ as valid 177 * and will set them noprobe when we do so. */ 178 #ifdef CONFIG_ARM 179 set_irq_flags(virq, IRQF_VALID); 180 #else 181 irq_set_noprobe(virq); 182 #endif 183 184 return 0; 185 } 186 187 static struct irq_domain_ops wm8994_edge_irq_ops = { 188 .map = wm8994_edge_irq_map, 189 .xlate = irq_domain_xlate_twocell, 190 }; 191 192 int wm8994_irq_init(struct wm8994 *wm8994) 193 { 194 int ret; 195 unsigned long irqflags; 196 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 197 198 if (!wm8994->irq) { 199 dev_warn(wm8994->dev, 200 "No interrupt specified, no interrupts\n"); 201 wm8994->irq_base = 0; 202 return 0; 203 } 204 205 /* select user or default irq flags */ 206 irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT; 207 if (pdata->irq_flags) 208 irqflags = pdata->irq_flags; 209 210 /* use a GPIO for edge triggered controllers */ 211 if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) { 212 if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) { 213 dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n", 214 wm8994->irq, pdata->irq_gpio, 215 gpio_to_irq(pdata->irq_gpio)); 216 wm8994->irq = gpio_to_irq(pdata->irq_gpio); 217 } 218 219 ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio, 220 GPIOF_IN, "WM8994 IRQ"); 221 222 if (ret != 0) { 223 dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n", 224 ret); 225 return ret; 226 } 227 228 wm8994->edge_irq = irq_domain_add_linear(NULL, 1, 229 &wm8994_edge_irq_ops, 230 wm8994); 231 232 ret = regmap_add_irq_chip(wm8994->regmap, 233 irq_create_mapping(wm8994->edge_irq, 234 0), 235 IRQF_ONESHOT, 236 wm8994->irq_base, &wm8994_irq_chip, 237 &wm8994->irq_data); 238 if (ret != 0) { 239 dev_err(wm8994->dev, "Failed to get IRQ: %d\n", 240 ret); 241 return ret; 242 } 243 244 ret = request_threaded_irq(wm8994->irq, 245 NULL, wm8994_edge_irq, 246 irqflags, 247 "WM8994 edge", wm8994); 248 } else { 249 ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq, 250 irqflags, 251 wm8994->irq_base, &wm8994_irq_chip, 252 &wm8994->irq_data); 253 } 254 255 if (ret != 0) { 256 dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret); 257 return ret; 258 } 259 260 /* Enable top level interrupt if it was masked */ 261 wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0); 262 263 return 0; 264 } 265 266 void wm8994_irq_exit(struct wm8994 *wm8994) 267 { 268 regmap_del_irq_chip(wm8994->irq, wm8994->irq_data); 269 } 270