drivers/mfd/wm8994-irq.c - linux - Git at Google

 /*
  * 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);
 }
	/*
	* 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);
	}