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linux/drivers/mfd/wm8350-irq.c
Mark Brown 0c7229f93a mfd: Convert WM835x IRQ handling to use a data table 
Rather than open coding individual IRQs in each function which
manipulates them store data for IRQs in a table which is then
referenced in the users.

This is a substantial code shrink and should be a performance win in
cases where only a single IRQ goes off at once since instead of
reading four of the second level IRQ registers for each interrupt
we read only the sub-registers which have had an interrupt flagged.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-12-13 19:21:02 +01:00

526 lines
13 KiB
C
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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(wm8350, 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,
void (*handler) (struct wm8350 *, int, void *),
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);
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;
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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