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-rw-r--r--drivers/mfd/Kconfig4
-rw-r--r--drivers/mfd/Makefile2
-rw-r--r--drivers/mfd/wm8994-core.c43
-rw-r--r--drivers/mfd/wm8994-irq.c310
-rw-r--r--include/linux/mfd/wm8994/core.h53
-rw-r--r--include/linux/mfd/wm8994/pdata.h1
6 files changed, 406 insertions, 7 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b2073e0..de3e74c 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -301,9 +301,9 @@ config MFD_WM8350_I2C
selected to enable support for the functionality of the chip.
config MFD_WM8994
- tristate "Support Wolfson Microelectronics WM8994"
+ bool "Support Wolfson Microelectronics WM8994"
select MFD_CORE
- depends on I2C
+ depends on I2C=y && GENERIC_HARDIRQS
help
The WM8994 is a highly integrated hi-fi CODEC designed for
smartphone applicatiosn. As well as audio functionality it
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 4fbf8f8..87935f9 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -26,7 +26,7 @@ wm8350-objs := wm8350-core.o wm8350-regmap.o wm8350-gpio.o
wm8350-objs += wm8350-irq.o
obj-$(CONFIG_MFD_WM8350) += wm8350.o
obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o
-obj-$(CONFIG_MFD_WM8994) += wm8994-core.o
+obj-$(CONFIG_MFD_WM8994) += wm8994-core.o wm8994-irq.o
obj-$(CONFIG_TPS65010) += tps65010.o
obj-$(CONFIG_MENELAUS) += menelaus.o
diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index 844e1c1..39cde82 100644
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -172,9 +172,34 @@ static struct mfd_cell wm8994_regulator_devs[] = {
{ .name = "wm8994-ldo", .id = 2 },
};
+static struct resource wm8994_codec_resources[] = {
+ {
+ .start = WM8994_IRQ_TEMP_SHUT,
+ .end = WM8994_IRQ_TEMP_WARN,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct resource wm8994_gpio_resources[] = {
+ {
+ .start = WM8994_IRQ_GPIO(1),
+ .end = WM8994_IRQ_GPIO(11),
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
static struct mfd_cell wm8994_devs[] = {
- { .name = "wm8994-codec" },
- { .name = "wm8994-gpio" },
+ {
+ .name = "wm8994-codec",
+ .num_resources = ARRAY_SIZE(wm8994_codec_resources),
+ .resources = wm8994_codec_resources,
+ },
+
+ {
+ .name = "wm8994-gpio",
+ .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
+ .resources = wm8994_gpio_resources,
+ },
};
/*
@@ -235,6 +260,11 @@ static int wm8994_device_resume(struct device *dev)
return ret;
}
+ ret = wm8994_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK,
+ WM8994_NUM_IRQ_REGS * 2, &wm8994->irq_masks_cur);
+ if (ret < 0)
+ dev_err(dev, "Failed to restore interrupt masks: %d\n", ret);
+
ret = wm8994_write(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2,
&wm8994->ldo_regs);
if (ret < 0)
@@ -347,6 +377,7 @@ static int wm8994_device_init(struct wm8994 *wm8994, unsigned long id, int irq)
if (pdata) {
+ wm8994->irq_base = pdata->irq_base;
wm8994->gpio_base = pdata->gpio_base;
/* GPIO configuration is only applied if it's non-zero */
@@ -374,16 +405,20 @@ static int wm8994_device_init(struct wm8994 *wm8994, unsigned long id, int irq)
WM8994_LDO1_DISCH, 0);
}
+ wm8994_irq_init(wm8994);
+
ret = mfd_add_devices(wm8994->dev, -1,
wm8994_devs, ARRAY_SIZE(wm8994_devs),
NULL, 0);
if (ret != 0) {
dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
- goto err_enable;
+ goto err_irq;
}
return 0;
+err_irq:
+ wm8994_irq_exit(wm8994);
err_enable:
regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
@@ -400,6 +435,7 @@ err:
static void wm8994_device_exit(struct wm8994 *wm8994)
{
mfd_remove_devices(wm8994->dev);
+ wm8994_irq_exit(wm8994);
regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
wm8994->supplies);
regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies);
@@ -468,6 +504,7 @@ static int wm8994_i2c_probe(struct i2c_client *i2c,
wm8994->control_data = i2c;
wm8994->read_dev = wm8994_i2c_read_device;
wm8994->write_dev = wm8994_i2c_write_device;
+ wm8994->irq = i2c->irq;
return wm8994_device_init(wm8994, id->driver_data, i2c->irq);
}
diff --git a/drivers/mfd/wm8994-irq.c b/drivers/mfd/wm8994-irq.c
new file mode 100644
index 0000000..8400eb1
--- /dev/null
+++ b/drivers/mfd/wm8994-irq.c
@@ -0,0 +1,310 @@
+/*
+ * 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(unsigned int irq)
+{
+ struct wm8994 *wm8994 = get_irq_chip_data(irq);
+
+ mutex_lock(&wm8994->irq_lock);
+}
+
+static void wm8994_irq_sync_unlock(unsigned int irq)
+{
+ struct wm8994 *wm8994 = get_irq_chip_data(irq);
+ 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_unmask(unsigned int irq)
+{
+ struct wm8994 *wm8994 = get_irq_chip_data(irq);
+ struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994, irq);
+
+ wm8994->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
+}
+
+static void wm8994_irq_mask(unsigned int irq)
+{
+ struct wm8994 *wm8994 = get_irq_chip_data(irq);
+ struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994, irq);
+
+ wm8994->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
+}
+
+static struct irq_chip wm8994_irq_chip = {
+ .name = "wm8994",
+ .bus_lock = wm8994_irq_lock,
+ .bus_sync_unlock = wm8994_irq_sync_unlock,
+ .mask = wm8994_irq_mask,
+ .unmask = wm8994_irq_unmask,
+};
+
+/* 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);
+}
diff --git a/include/linux/mfd/wm8994/core.h b/include/linux/mfd/wm8994/core.h
index b06ff28..de79bae 100644
--- a/include/linux/mfd/wm8994/core.h
+++ b/include/linux/mfd/wm8994/core.h
@@ -15,14 +15,38 @@
#ifndef __MFD_WM8994_CORE_H__
#define __MFD_WM8994_CORE_H__
+#include <linux/interrupt.h>
+
struct regulator_dev;
struct regulator_bulk_data;
#define WM8994_NUM_GPIO_REGS 11
-#define WM8994_NUM_LDO_REGS 2
+#define WM8994_NUM_LDO_REGS 2
+#define WM8994_NUM_IRQ_REGS 2
+
+#define WM8994_IRQ_TEMP_SHUT 0
+#define WM8994_IRQ_MIC1_DET 1
+#define WM8994_IRQ_MIC1_SHRT 2
+#define WM8994_IRQ_MIC2_DET 3
+#define WM8994_IRQ_MIC2_SHRT 4
+#define WM8994_IRQ_FLL1_LOCK 5
+#define WM8994_IRQ_FLL2_LOCK 6
+#define WM8994_IRQ_SRC1_LOCK 7
+#define WM8994_IRQ_SRC2_LOCK 8
+#define WM8994_IRQ_AIF1DRC1_SIG_DET 9
+#define WM8994_IRQ_AIF1DRC2_SIG_DET 10
+#define WM8994_IRQ_AIF2DRC_SIG_DET 11
+#define WM8994_IRQ_FIFOS_ERR 12
+#define WM8994_IRQ_WSEQ_DONE 13
+#define WM8994_IRQ_DCS_DONE 14
+#define WM8994_IRQ_TEMP_WARN 15
+
+/* GPIOs in the chip are numbered from 1-11 */
+#define WM8994_IRQ_GPIO(x) (x + WM8994_IRQ_TEMP_WARN)
struct wm8994 {
struct mutex io_lock;
+ struct mutex irq_lock;
struct device *dev;
int (*read_dev)(struct wm8994 *wm8994, unsigned short reg,
@@ -33,6 +57,11 @@ struct wm8994 {
void *control_data;
int gpio_base;
+ int irq_base;
+
+ int irq;
+ u16 irq_masks_cur[WM8994_NUM_IRQ_REGS];
+ u16 irq_masks_cache[WM8994_NUM_IRQ_REGS];
/* Used over suspend/resume */
u16 ldo_regs[WM8994_NUM_LDO_REGS];
@@ -51,4 +80,26 @@ int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
int count, u16 *buf);
+
+/* Helper to save on boilerplate */
+static inline int wm8994_request_irq(struct wm8994 *wm8994, int irq,
+ irq_handler_t handler, const char *name,
+ void *data)
+{
+ if (!wm8994->irq_base)
+ return -EINVAL;
+ return request_threaded_irq(wm8994->irq_base + irq, NULL, handler,
+ IRQF_TRIGGER_RISING, name,
+ data);
+}
+static inline void wm8994_free_irq(struct wm8994 *wm8994, int irq, void *data)
+{
+ if (!wm8994->irq_base)
+ return;
+ free_irq(wm8994->irq_base + irq, data);
+}
+
+int wm8994_irq_init(struct wm8994 *wm8994);
+void wm8994_irq_exit(struct wm8994 *wm8994);
+
#endif
diff --git a/include/linux/mfd/wm8994/pdata.h b/include/linux/mfd/wm8994/pdata.h
index 70d6a86..5c51f36 100644
--- a/include/linux/mfd/wm8994/pdata.h
+++ b/include/linux/mfd/wm8994/pdata.h
@@ -70,6 +70,7 @@ struct wm8994_pdata {
struct wm8994_ldo_pdata ldo[WM8994_NUM_LDO];
+ int irq_base; /** Base IRQ number for WM8994, required for IRQs */
int num_drc_cfgs;
struct wm8994_drc_cfg *drc_cfgs;
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