diff options
Diffstat (limited to 'drivers/mfd/wm8994-irq.c')
| -rw-r--r-- | drivers/mfd/wm8994-irq.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/mfd/wm8994-irq.c b/drivers/mfd/wm8994-irq.c new file mode 100644 index 000000000..2c58d9b99 --- /dev/null +++ b/drivers/mfd/wm8994-irq.c @@ -0,0 +1,264 @@ +/* + * 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 const 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 const 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_find_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); + irq_set_noprobe(virq); + + return 0; +} + +static const 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 = &wm8994->pdata; + + 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; +} +EXPORT_SYMBOL(wm8994_irq_init); + +void wm8994_irq_exit(struct wm8994 *wm8994) +{ + regmap_del_irq_chip(wm8994->irq, wm8994->irq_data); +} +EXPORT_SYMBOL(wm8994_irq_exit); |