/* * 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/i2c.h> #include <linux/irq.h> #include <linux/mfd/core.h> #include <linux/interrupt.h> #include <linux/mfd/wm8994/core.h> #include <linux/mfd/wm8994/registers.h> #include <linux/delay.h> struct wm8994_irq_data { int reg; int mask; }; static struct wm8994_irq_data wm8994_irqs[] = { [WM8994_IRQ_TEMP_SHUT] = { .reg = 2, .mask = WM8994_TEMP_SHUT_EINT, }, [WM8994_IRQ_MIC1_DET] = { .reg = 2, .mask = WM8994_MIC1_DET_EINT, }, [WM8994_IRQ_MIC1_SHRT] = { .reg = 2, .mask = WM8994_MIC1_SHRT_EINT, }, [WM8994_IRQ_MIC2_DET] = { .reg = 2, .mask = WM8994_MIC2_DET_EINT, }, [WM8994_IRQ_MIC2_SHRT] = { .reg = 2, .mask = WM8994_MIC2_SHRT_EINT, }, [WM8994_IRQ_FLL1_LOCK] = { .reg = 2, .mask = WM8994_FLL1_LOCK_EINT, }, [WM8994_IRQ_FLL2_LOCK] = { .reg = 2, .mask = WM8994_FLL2_LOCK_EINT, }, [WM8994_IRQ_SRC1_LOCK] = { .reg = 2, .mask = WM8994_SRC1_LOCK_EINT, }, [WM8994_IRQ_SRC2_LOCK] = { .reg = 2, .mask = WM8994_SRC2_LOCK_EINT, }, [WM8994_IRQ_AIF1DRC1_SIG_DET] = { .reg = 2, .mask = WM8994_AIF1DRC1_SIG_DET, }, [WM8994_IRQ_AIF1DRC2_SIG_DET] = { .reg = 2, .mask = WM8994_AIF1DRC2_SIG_DET_EINT, }, [WM8994_IRQ_AIF2DRC_SIG_DET] = { .reg = 2, .mask = WM8994_AIF2DRC_SIG_DET_EINT, }, [WM8994_IRQ_FIFOS_ERR] = { .reg = 2, .mask = WM8994_FIFOS_ERR_EINT, }, [WM8994_IRQ_WSEQ_DONE] = { .reg = 2, .mask = WM8994_WSEQ_DONE_EINT, }, [WM8994_IRQ_DCS_DONE] = { .reg = 2, .mask = WM8994_DCS_DONE_EINT, }, [WM8994_IRQ_TEMP_WARN] = { .reg = 2, .mask = WM8994_TEMP_WARN_EINT, }, [WM8994_IRQ_GPIO(1)] = { .reg = 1, .mask = WM8994_GP1_EINT, }, [WM8994_IRQ_GPIO(2)] = { .reg = 1, .mask = WM8994_GP2_EINT, }, [WM8994_IRQ_GPIO(3)] = { .reg = 1, .mask = WM8994_GP3_EINT, }, [WM8994_IRQ_GPIO(4)] = { .reg = 1, .mask = WM8994_GP4_EINT, }, [WM8994_IRQ_GPIO(5)] = { .reg = 1, .mask = WM8994_GP5_EINT, }, [WM8994_IRQ_GPIO(6)] = { .reg = 1, .mask = WM8994_GP6_EINT, }, [WM8994_IRQ_GPIO(7)] = { .reg = 1, .mask = WM8994_GP7_EINT, }, [WM8994_IRQ_GPIO(8)] = { .reg = 1, .mask = WM8994_GP8_EINT, }, [WM8994_IRQ_GPIO(9)] = { .reg = 1, .mask = WM8994_GP8_EINT, }, [WM8994_IRQ_GPIO(10)] = { .reg = 1, .mask = WM8994_GP10_EINT, }, [WM8994_IRQ_GPIO(11)] = { .reg = 1, .mask = WM8994_GP11_EINT, }, }; static inline int irq_data_to_status_reg(struct wm8994_irq_data *irq_data) { return WM8994_INTERRUPT_STATUS_1 - 1 + irq_data->reg; } static inline int irq_data_to_mask_reg(struct wm8994_irq_data *irq_data) { return WM8994_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg; } static inline struct wm8994_irq_data *irq_to_wm8994_irq(struct wm8994 *wm8994, int irq) { return &wm8994_irqs[irq - wm8994->irq_base]; } static void wm8994_irq_lock(struct irq_data *data) { struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data); mutex_lock(&wm8994->irq_lock); } static void wm8994_irq_sync_unlock(struct irq_data *data) { struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data); int i; for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) { /* If there's been a change in the mask write it back * to the hardware. */ if (wm8994->irq_masks_cur[i] != wm8994->irq_masks_cache[i]) { wm8994->irq_masks_cache[i] = wm8994->irq_masks_cur[i]; wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK + i, wm8994->irq_masks_cur[i]); } } mutex_unlock(&wm8994->irq_lock); } static void wm8994_irq_enable(struct irq_data *data) { struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data); struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994, data->irq); wm8994->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask; } static void wm8994_irq_disable(struct irq_data *data) { struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data); struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994, data->irq); wm8994->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask; } static struct irq_chip wm8994_irq_chip = { .name = "wm8994", .irq_bus_lock = wm8994_irq_lock, .irq_bus_sync_unlock = wm8994_irq_sync_unlock, .irq_disable = wm8994_irq_disable, .irq_enable = wm8994_irq_enable, }; /* The processing of the primary interrupt occurs in a thread so that * we can interact with the device over I2C or SPI. */ static irqreturn_t wm8994_irq_thread(int irq, void *data) { struct wm8994 *wm8994 = data; unsigned int i; u16 status[WM8994_NUM_IRQ_REGS]; int ret; ret = wm8994_bulk_read(wm8994, WM8994_INTERRUPT_STATUS_1, WM8994_NUM_IRQ_REGS, status); if (ret < 0) { dev_err(wm8994->dev, "Failed to read interrupt status: %d\n", ret); return IRQ_NONE; } /* Bit swap and apply masking */ for (i = 0; i < WM8994_NUM_IRQ_REGS; i++) { status[i] = be16_to_cpu(status[i]); status[i] &= ~wm8994->irq_masks_cur[i]; } /* Ack any unmasked IRQs */ for (i = 0; i < ARRAY_SIZE(status); i++) { if (status[i]) wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1 + i, status[i]); } /* Report */ for (i = 0; i < ARRAY_SIZE(wm8994_irqs); i++) { if (status[wm8994_irqs[i].reg - 1] & wm8994_irqs[i].mask) handle_nested_irq(wm8994->irq_base + i); } return IRQ_HANDLED; } int wm8994_irq_init(struct wm8994 *wm8994) { int i, cur_irq, ret; mutex_init(&wm8994->irq_lock); /* Mask the individual interrupt sources */ for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) { wm8994->irq_masks_cur[i] = 0xffff; wm8994->irq_masks_cache[i] = 0xffff; wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK + i, 0xffff); } if (!wm8994->irq) { dev_warn(wm8994->dev, "No interrupt specified, no interrupts\n"); wm8994->irq_base = 0; return 0; } if (!wm8994->irq_base) { dev_err(wm8994->dev, "No interrupt base specified, no interrupts\n"); return 0; } /* Register them with genirq */ for (cur_irq = wm8994->irq_base; cur_irq < ARRAY_SIZE(wm8994_irqs) + wm8994->irq_base; cur_irq++) { irq_set_chip_data(cur_irq, wm8994); irq_set_chip_and_handler(cur_irq, &wm8994_irq_chip, handle_edge_irq); irq_set_nested_thread(cur_irq, 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(cur_irq, IRQF_VALID); #else irq_set_noprobe(cur_irq); #endif } ret = request_threaded_irq(wm8994->irq, NULL, wm8994_irq_thread, IRQF_TRIGGER_HIGH | IRQF_ONESHOT, "wm8994", wm8994); if (ret != 0) { dev_err(wm8994->dev, "Failed to request IRQ %d: %d\n", wm8994->irq, 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) { if (wm8994->irq) free_irq(wm8994->irq, wm8994); }