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linux/drivers/mfd/wm8350-irq.c
Mark Brown 6a6127462e mfd: Mask and unmask wm8350 IRQs on request and free 
Bring the WM8350 IRQ API more in line with the generic IRQ API by
masking and unmasking interrupts as they are requested and freed.
This is mostly just a case of deleting the mask and unmask calls
from the individual drivers.

The RTC driver is changed to mask the periodic IRQ after requesting
it rather than only unmasking the alarm IRQ. If the periodic IRQ
fires in the period where it is reqested then there will be a
spurious notification but there should be no serious consequences
from this.

The CODEC drive is changed to explicitly disable headphone jack
detection prior to requesting the IRQs. This will avoid the IRQ
firing with no jack set up.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-12-13 19:21:40 +01:00

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/*
* 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;
}
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