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linux-stable/drivers/mfd/wm8994-irq.c
Mark Brown d664f20020 mfd: Convert WM8994/58 interrupt masking to enable/disable operations 
The WM8994/58 interrupt masking support is a much better match for the genirq
enable and disable operations than for the mask and unmask operations. The
latter are intended to used during interrupt handling for temporary changes
which isn't really practical on a slow bus. Convert the operations over to
match this.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2011-03-23 10:42:01 +01:00

312 lines
7.1 KiB
C
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/*
* 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;
}
/* Apply masking */
for (i = 0; i < WM8994_NUM_IRQ_REGS; i++)
status[i] &= ~wm8994->irq_masks_cur[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);
}
/* 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]);
}
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++) {
set_irq_chip_data(cur_irq, wm8994);
set_irq_chip_and_handler(cur_irq, &wm8994_irq_chip,
handle_edge_irq);
set_irq_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
set_irq_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);
}
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