/* * wm8994-irq.c -- Interrupt controller support for Wolfson WM8994 * * Copyright 2010 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/gpio.h> #include <linux/i2c.h> #include <linux/irq.h> #include <linux/mfd/core.h> #include <linux/interrupt.h> #include <linux/irqdomain.h> #include <linux/regmap.h> #include <linux/mfd/wm8994/core.h> #include <linux/mfd/wm8994/pdata.h> #include <linux/mfd/wm8994/registers.h> #include <linux/delay.h> static struct regmap_irq wm8994_irqs[] = { [WM8994_IRQ_TEMP_SHUT] = { .reg_offset = 1, .mask = WM8994_TEMP_SHUT_EINT, }, [WM8994_IRQ_MIC1_DET] = { .reg_offset = 1, .mask = WM8994_MIC1_DET_EINT, }, [WM8994_IRQ_MIC1_SHRT] = { .reg_offset = 1, .mask = WM8994_MIC1_SHRT_EINT, }, [WM8994_IRQ_MIC2_DET] = { .reg_offset = 1, .mask = WM8994_MIC2_DET_EINT, }, [WM8994_IRQ_MIC2_SHRT] = { .reg_offset = 1, .mask = WM8994_MIC2_SHRT_EINT, }, [WM8994_IRQ_FLL1_LOCK] = { .reg_offset = 1, .mask = WM8994_FLL1_LOCK_EINT, }, [WM8994_IRQ_FLL2_LOCK] = { .reg_offset = 1, .mask = WM8994_FLL2_LOCK_EINT, }, [WM8994_IRQ_SRC1_LOCK] = { .reg_offset = 1, .mask = WM8994_SRC1_LOCK_EINT, }, [WM8994_IRQ_SRC2_LOCK] = { .reg_offset = 1, .mask = WM8994_SRC2_LOCK_EINT, }, [WM8994_IRQ_AIF1DRC1_SIG_DET] = { .reg_offset = 1, .mask = WM8994_AIF1DRC1_SIG_DET, }, [WM8994_IRQ_AIF1DRC2_SIG_DET] = { .reg_offset = 1, .mask = WM8994_AIF1DRC2_SIG_DET_EINT, }, [WM8994_IRQ_AIF2DRC_SIG_DET] = { .reg_offset = 1, .mask = WM8994_AIF2DRC_SIG_DET_EINT, }, [WM8994_IRQ_FIFOS_ERR] = { .reg_offset = 1, .mask = WM8994_FIFOS_ERR_EINT, }, [WM8994_IRQ_WSEQ_DONE] = { .reg_offset = 1, .mask = WM8994_WSEQ_DONE_EINT, }, [WM8994_IRQ_DCS_DONE] = { .reg_offset = 1, .mask = WM8994_DCS_DONE_EINT, }, [WM8994_IRQ_TEMP_WARN] = { .reg_offset = 1, .mask = WM8994_TEMP_WARN_EINT, }, [WM8994_IRQ_GPIO(1)] = { .mask = WM8994_GP1_EINT, }, [WM8994_IRQ_GPIO(2)] = { .mask = WM8994_GP2_EINT, }, [WM8994_IRQ_GPIO(3)] = { .mask = WM8994_GP3_EINT, }, [WM8994_IRQ_GPIO(4)] = { .mask = WM8994_GP4_EINT, }, [WM8994_IRQ_GPIO(5)] = { .mask = WM8994_GP5_EINT, }, [WM8994_IRQ_GPIO(6)] = { .mask = WM8994_GP6_EINT, }, [WM8994_IRQ_GPIO(7)] = { .mask = WM8994_GP7_EINT, }, [WM8994_IRQ_GPIO(8)] = { .mask = WM8994_GP8_EINT, }, [WM8994_IRQ_GPIO(9)] = { .mask = WM8994_GP8_EINT, }, [WM8994_IRQ_GPIO(10)] = { .mask = WM8994_GP10_EINT, }, [WM8994_IRQ_GPIO(11)] = { .mask = WM8994_GP11_EINT, }, }; static struct regmap_irq_chip wm8994_irq_chip = { .name = "wm8994", .irqs = wm8994_irqs, .num_irqs = ARRAY_SIZE(wm8994_irqs), .num_regs = 2, .status_base = WM8994_INTERRUPT_STATUS_1, .mask_base = WM8994_INTERRUPT_STATUS_1_MASK, .ack_base = WM8994_INTERRUPT_STATUS_1, .runtime_pm = true, }; static void wm8994_edge_irq_enable(struct irq_data *data) { } static void wm8994_edge_irq_disable(struct irq_data *data) { } static struct irq_chip wm8994_edge_irq_chip = { .name = "wm8994_edge", .irq_disable = wm8994_edge_irq_disable, .irq_enable = wm8994_edge_irq_enable, }; static irqreturn_t wm8994_edge_irq(int irq, void *data) { struct wm8994 *wm8994 = data; while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio)) handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0)); return IRQ_HANDLED; } static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { struct wm8994 *wm8994 = h->host_data; irq_set_chip_data(virq, wm8994); irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq); irq_set_nested_thread(virq, 1); /* ARM needs us to explicitly flag the IRQ as valid * and will set them noprobe when we do so. */ #ifdef CONFIG_ARM set_irq_flags(virq, IRQF_VALID); #else irq_set_noprobe(virq); #endif return 0; } static struct irq_domain_ops wm8994_edge_irq_ops = { .map = wm8994_edge_irq_map, .xlate = irq_domain_xlate_twocell, }; int wm8994_irq_init(struct wm8994 *wm8994) { int ret; unsigned long irqflags; struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); if (!wm8994->irq) { dev_warn(wm8994->dev, "No interrupt specified, no interrupts\n"); wm8994->irq_base = 0; return 0; } /* select user or default irq flags */ irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT; if (pdata->irq_flags) irqflags = pdata->irq_flags; /* use a GPIO for edge triggered controllers */ if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) { if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) { dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n", wm8994->irq, pdata->irq_gpio, gpio_to_irq(pdata->irq_gpio)); wm8994->irq = gpio_to_irq(pdata->irq_gpio); } ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio, GPIOF_IN, "WM8994 IRQ"); if (ret != 0) { dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n", ret); return ret; } wm8994->edge_irq = irq_domain_add_linear(NULL, 1, &wm8994_edge_irq_ops, wm8994); ret = regmap_add_irq_chip(wm8994->regmap, irq_create_mapping(wm8994->edge_irq, 0), IRQF_ONESHOT, wm8994->irq_base, &wm8994_irq_chip, &wm8994->irq_data); if (ret != 0) { dev_err(wm8994->dev, "Failed to get IRQ: %d\n", ret); return ret; } ret = request_threaded_irq(wm8994->irq, NULL, wm8994_edge_irq, irqflags, "WM8994 edge", wm8994); } else { ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq, irqflags, wm8994->irq_base, &wm8994_irq_chip, &wm8994->irq_data); } if (ret != 0) { dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret); return ret; } /* Enable top level interrupt if it was masked */ wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0); return 0; } void wm8994_irq_exit(struct wm8994 *wm8994) { regmap_del_irq_chip(wm8994->irq, wm8994->irq_data); }