diff options
Diffstat (limited to 'drivers/mfd/wm8350-irq.c')
| -rw-r--r-- | drivers/mfd/wm8350-irq.c | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/drivers/mfd/wm8350-irq.c b/drivers/mfd/wm8350-irq.c new file mode 100644 index 000000000000..c8df547c4747 --- /dev/null +++ b/drivers/mfd/wm8350-irq.c @@ -0,0 +1,529 @@ +/* + * wm8350-irq.c -- IRQ support for Wolfson WM8350 + * + * Copyright 2007, 2008, 2009 Wolfson Microelectronics PLC. + * + * Author: Liam Girdwood, Mark Brown + * + * 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/init.h> +#include <linux/bug.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> + +#include <linux/mfd/wm8350/core.h> +#include <linux/mfd/wm8350/audio.h> +#include <linux/mfd/wm8350/comparator.h> +#include <linux/mfd/wm8350/gpio.h> +#include <linux/mfd/wm8350/pmic.h> +#include <linux/mfd/wm8350/rtc.h> +#include <linux/mfd/wm8350/supply.h> +#include <linux/mfd/wm8350/wdt.h> + +#define WM8350_NUM_IRQ_REGS 7 + +#define WM8350_INT_OFFSET_1 0 +#define WM8350_INT_OFFSET_2 1 +#define WM8350_POWER_UP_INT_OFFSET 2 +#define WM8350_UNDER_VOLTAGE_INT_OFFSET 3 +#define WM8350_OVER_CURRENT_INT_OFFSET 4 +#define WM8350_GPIO_INT_OFFSET 5 +#define WM8350_COMPARATOR_INT_OFFSET 6 + +struct wm8350_irq_data { + int primary; + int reg; + int mask; + int primary_only; +}; + +static struct wm8350_irq_data wm8350_irqs[] = { + [WM8350_IRQ_OC_LS] = { + .primary = WM8350_OC_INT, + .reg = WM8350_OVER_CURRENT_INT_OFFSET, + .mask = WM8350_OC_LS_EINT, + .primary_only = 1, + }, + [WM8350_IRQ_UV_DC1] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_DC1_EINT, + }, + [WM8350_IRQ_UV_DC2] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_DC2_EINT, + }, + [WM8350_IRQ_UV_DC3] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_DC3_EINT, + }, + [WM8350_IRQ_UV_DC4] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_DC4_EINT, + }, + [WM8350_IRQ_UV_DC5] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_DC5_EINT, + }, + [WM8350_IRQ_UV_DC6] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_DC6_EINT, + }, + [WM8350_IRQ_UV_LDO1] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_LDO1_EINT, + }, + [WM8350_IRQ_UV_LDO2] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_LDO2_EINT, + }, + [WM8350_IRQ_UV_LDO3] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_LDO3_EINT, + }, + [WM8350_IRQ_UV_LDO4] = { + .primary = WM8350_UV_INT, + .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET, + .mask = WM8350_UV_LDO4_EINT, + }, + [WM8350_IRQ_CHG_BAT_HOT] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_BAT_HOT_EINT, + }, + [WM8350_IRQ_CHG_BAT_COLD] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_BAT_COLD_EINT, + }, + [WM8350_IRQ_CHG_BAT_FAIL] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_BAT_FAIL_EINT, + }, + [WM8350_IRQ_CHG_TO] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_TO_EINT, + }, + [WM8350_IRQ_CHG_END] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_END_EINT, + }, + [WM8350_IRQ_CHG_START] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_START_EINT, + }, + [WM8350_IRQ_CHG_FAST_RDY] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_FAST_RDY_EINT, + }, + [WM8350_IRQ_CHG_VBATT_LT_3P9] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_VBATT_LT_3P9_EINT, + }, + [WM8350_IRQ_CHG_VBATT_LT_3P1] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_VBATT_LT_3P1_EINT, + }, + [WM8350_IRQ_CHG_VBATT_LT_2P85] = { + .primary = WM8350_CHG_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_CHG_VBATT_LT_2P85_EINT, + }, + [WM8350_IRQ_RTC_ALM] = { + .primary = WM8350_RTC_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_RTC_ALM_EINT, + }, + [WM8350_IRQ_RTC_SEC] = { + .primary = WM8350_RTC_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_RTC_SEC_EINT, + }, + [WM8350_IRQ_RTC_PER] = { + .primary = WM8350_RTC_INT, + .reg = WM8350_INT_OFFSET_1, + .mask = WM8350_RTC_PER_EINT, + }, + [WM8350_IRQ_CS1] = { + .primary = WM8350_CS_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_CS1_EINT, + }, + [WM8350_IRQ_CS2] = { + .primary = WM8350_CS_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_CS2_EINT, + }, + [WM8350_IRQ_SYS_HYST_COMP_FAIL] = { + .primary = WM8350_SYS_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_SYS_HYST_COMP_FAIL_EINT, + }, + [WM8350_IRQ_SYS_CHIP_GT115] = { + .primary = WM8350_SYS_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_SYS_CHIP_GT115_EINT, + }, + [WM8350_IRQ_SYS_CHIP_GT140] = { + .primary = WM8350_SYS_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_SYS_CHIP_GT140_EINT, + }, + [WM8350_IRQ_SYS_WDOG_TO] = { + .primary = WM8350_SYS_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_SYS_WDOG_TO_EINT, + }, + [WM8350_IRQ_AUXADC_DATARDY] = { + .primary = WM8350_AUXADC_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_AUXADC_DATARDY_EINT, + }, + [WM8350_IRQ_AUXADC_DCOMP4] = { + .primary = WM8350_AUXADC_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_AUXADC_DCOMP4_EINT, + }, + [WM8350_IRQ_AUXADC_DCOMP3] = { + .primary = WM8350_AUXADC_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_AUXADC_DCOMP3_EINT, + }, + [WM8350_IRQ_AUXADC_DCOMP2] = { + .primary = WM8350_AUXADC_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_AUXADC_DCOMP2_EINT, + }, + [WM8350_IRQ_AUXADC_DCOMP1] = { + .primary = WM8350_AUXADC_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_AUXADC_DCOMP1_EINT, + }, + [WM8350_IRQ_USB_LIMIT] = { + .primary = WM8350_USB_INT, + .reg = WM8350_INT_OFFSET_2, + .mask = WM8350_USB_LIMIT_EINT, + .primary_only = 1, + }, + [WM8350_IRQ_WKUP_OFF_STATE] = { + .primary = WM8350_WKUP_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_WKUP_OFF_STATE_EINT, + }, + [WM8350_IRQ_WKUP_HIB_STATE] = { + .primary = WM8350_WKUP_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_WKUP_HIB_STATE_EINT, + }, + [WM8350_IRQ_WKUP_CONV_FAULT] = { + .primary = WM8350_WKUP_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_WKUP_CONV_FAULT_EINT, + }, + [WM8350_IRQ_WKUP_WDOG_RST] = { + .primary = WM8350_WKUP_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_WKUP_WDOG_RST_EINT, + }, + [WM8350_IRQ_WKUP_GP_PWR_ON] = { + .primary = WM8350_WKUP_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_WKUP_GP_PWR_ON_EINT, + }, + [WM8350_IRQ_WKUP_ONKEY] = { + .primary = WM8350_WKUP_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_WKUP_ONKEY_EINT, + }, + [WM8350_IRQ_WKUP_GP_WAKEUP] = { + .primary = WM8350_WKUP_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_WKUP_GP_WAKEUP_EINT, + }, + [WM8350_IRQ_CODEC_JCK_DET_L] = { + .primary = WM8350_CODEC_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_CODEC_JCK_DET_L_EINT, + }, + [WM8350_IRQ_CODEC_JCK_DET_R] = { + .primary = WM8350_CODEC_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_CODEC_JCK_DET_R_EINT, + }, + [WM8350_IRQ_CODEC_MICSCD] = { + .primary = WM8350_CODEC_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_CODEC_MICSCD_EINT, + }, + [WM8350_IRQ_CODEC_MICD] = { + .primary = WM8350_CODEC_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_CODEC_MICD_EINT, + }, + [WM8350_IRQ_EXT_USB_FB] = { + .primary = WM8350_EXT_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_EXT_USB_FB_EINT, + }, + [WM8350_IRQ_EXT_WALL_FB] = { + .primary = WM8350_EXT_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_EXT_WALL_FB_EINT, + }, + [WM8350_IRQ_EXT_BAT_FB] = { + .primary = WM8350_EXT_INT, + .reg = WM8350_COMPARATOR_INT_OFFSET, + .mask = WM8350_EXT_BAT_FB_EINT, + }, + [WM8350_IRQ_GPIO(0)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP0_EINT, + }, + [WM8350_IRQ_GPIO(1)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP1_EINT, + }, + [WM8350_IRQ_GPIO(2)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP2_EINT, + }, + [WM8350_IRQ_GPIO(3)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP3_EINT, + }, + [WM8350_IRQ_GPIO(4)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP4_EINT, + }, + [WM8350_IRQ_GPIO(5)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP5_EINT, + }, + [WM8350_IRQ_GPIO(6)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP6_EINT, + }, + [WM8350_IRQ_GPIO(7)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP7_EINT, + }, + [WM8350_IRQ_GPIO(8)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP8_EINT, + }, + [WM8350_IRQ_GPIO(9)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP9_EINT, + }, + [WM8350_IRQ_GPIO(10)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP10_EINT, + }, + [WM8350_IRQ_GPIO(11)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP11_EINT, + }, + [WM8350_IRQ_GPIO(12)] = { + .primary = WM8350_GP_INT, + .reg = WM8350_GPIO_INT_OFFSET, + .mask = WM8350_GP12_EINT, + }, +}; + +static void wm8350_irq_call_handler(struct wm8350 *wm8350, int irq) +{ + mutex_lock(&wm8350->irq_mutex); + + if (wm8350->irq[irq].handler) + wm8350->irq[irq].handler(irq, wm8350->irq[irq].data); + else { + dev_err(wm8350->dev, "irq %d nobody cared. now masked.\n", + irq); + wm8350_mask_irq(wm8350, irq); + } + + mutex_unlock(&wm8350->irq_mutex); +} + +/* + * This is a threaded IRQ handler so can access I2C/SPI. Since all + * interrupts are clear on read the IRQ line will be reasserted and + * the physical IRQ will be handled again if another interrupt is + * asserted while we run - in the normal course of events this is a + * rare occurrence so we save I2C/SPI reads. + */ +static irqreturn_t wm8350_irq(int irq, void *irq_data) +{ + struct wm8350 *wm8350 = irq_data; + u16 level_one; + u16 sub_reg[WM8350_NUM_IRQ_REGS]; + int read_done[WM8350_NUM_IRQ_REGS]; + struct wm8350_irq_data *data; + int i; + + /* TODO: Use block reads to improve performance? */ + level_one = wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS) + & ~wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK); + + if (!level_one) + return IRQ_NONE; + + memset(&read_done, 0, sizeof(read_done)); + + for (i = 0; i < ARRAY_SIZE(wm8350_irqs); i++) { + data = &wm8350_irqs[i]; + + if (!(level_one & data->primary)) + continue; + + if (!read_done[data->reg]) { + sub_reg[data->reg] = + wm8350_reg_read(wm8350, WM8350_INT_STATUS_1 + + data->reg); + sub_reg[data->reg] &= + ~wm8350_reg_read(wm8350, + WM8350_INT_STATUS_1_MASK + + data->reg); + read_done[data->reg] = 1; + } + + if (sub_reg[data->reg] & data->mask) + wm8350_irq_call_handler(wm8350, i); + } + + return IRQ_HANDLED; +} + +int wm8350_register_irq(struct wm8350 *wm8350, int irq, + irq_handler_t handler, unsigned long flags, + const char *name, void *data) +{ + if (irq < 0 || irq > WM8350_NUM_IRQ || !handler) + return -EINVAL; + + if (wm8350->irq[irq].handler) + return -EBUSY; + + mutex_lock(&wm8350->irq_mutex); + wm8350->irq[irq].handler = handler; + wm8350->irq[irq].data = data; + mutex_unlock(&wm8350->irq_mutex); + + wm8350_unmask_irq(wm8350, irq); + + return 0; +} +EXPORT_SYMBOL_GPL(wm8350_register_irq); + +int wm8350_free_irq(struct wm8350 *wm8350, int irq) +{ + if (irq < 0 || irq > WM8350_NUM_IRQ) + return -EINVAL; + + wm8350_mask_irq(wm8350, irq); + + mutex_lock(&wm8350->irq_mutex); + wm8350->irq[irq].handler = NULL; + mutex_unlock(&wm8350->irq_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(wm8350_free_irq); + +int wm8350_mask_irq(struct wm8350 *wm8350, int irq) +{ + return wm8350_set_bits(wm8350, WM8350_INT_STATUS_1_MASK + + wm8350_irqs[irq].reg, + wm8350_irqs[irq].mask); +} +EXPORT_SYMBOL_GPL(wm8350_mask_irq); + +int wm8350_unmask_irq(struct wm8350 *wm8350, int irq) +{ + return wm8350_clear_bits(wm8350, WM8350_INT_STATUS_1_MASK + + wm8350_irqs[irq].reg, + wm8350_irqs[irq].mask); +} +EXPORT_SYMBOL_GPL(wm8350_unmask_irq); + +int wm8350_irq_init(struct wm8350 *wm8350, int irq, + struct wm8350_platform_data *pdata) +{ + int ret; + int flags = IRQF_ONESHOT; + + if (!irq) { + dev_err(wm8350->dev, "No IRQ configured\n"); + return -EINVAL; + } + + wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF); + wm8350_reg_write(wm8350, WM8350_INT_STATUS_1_MASK, 0xFFFF); + wm8350_reg_write(wm8350, WM8350_INT_STATUS_2_MASK, 0xFFFF); + wm8350_reg_write(wm8350, WM8350_UNDER_VOLTAGE_INT_STATUS_MASK, 0xFFFF); + wm8350_reg_write(wm8350, WM8350_GPIO_INT_STATUS_MASK, 0xFFFF); + wm8350_reg_write(wm8350, WM8350_COMPARATOR_INT_STATUS_MASK, 0xFFFF); + + mutex_init(&wm8350->irq_mutex); + wm8350->chip_irq = irq; + + if (pdata && pdata->irq_high) { + flags |= IRQF_TRIGGER_HIGH; + + wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1, + WM8350_IRQ_POL); + } else { + flags |= IRQF_TRIGGER_LOW; + + wm8350_clear_bits(wm8350, WM8350_SYSTEM_CONTROL_1, + WM8350_IRQ_POL); + } + + ret = request_threaded_irq(irq, NULL, wm8350_irq, flags, + "wm8350", wm8350); + if (ret != 0) + dev_err(wm8350->dev, "Failed to request IRQ: %d\n", ret); + + return ret; +} + +int wm8350_irq_exit(struct wm8350 *wm8350) +{ + free_irq(wm8350->chip_irq, wm8350); + return 0; +} |