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Date: Wed, 3 Oct 2012 14:06:57 -0300
From: Fabio Estevam <festevam@...il.com>
To: sameo@...ux.intel.com
Cc: broonie@...nsource.wolfsonmicro.com, ashish.jangam@...tcummins.com,
dchen@...semi.com, arnd@...db.de, kernel@...gutronix.de,
dmitry.torokhov@...il.com, linux-kernel@...r.kernel.org,
Fabio Estevam <fabio.estevam@...escale.com>
Subject: [RFC 1/3] mfd: da9052-core: Use regmap_irq_get_virq() and fix the probe
From: Fabio Estevam <fabio.estevam@...escale.com>
On a mx53qsb dt-kernel the da9052-core driver fails to probe as follows:
da9052 1-0048: DA9052 ADC IRQ failed ret=-22
The reason for the error was due to passing only the offset as the interrupt
number in request_threaded_irq().
The recommended approach though is to use regmap_get_virq() to acquire the
interrupt number.
Fix it and allow the driver to probe successfully.
Also provide a few more error logs and change the irq string to "adc-irq", so
that it appears as a single word in 'cat /proc/inte
Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
---
drivers/mfd/da9052-core.c | 89 ++++++++++++++++++++++++++++++-------
include/linux/mfd/da9052/da9052.h | 1 +
2 files changed, 74 insertions(+), 16 deletions(-)
diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c
index a0a62b2..6574242 100644
--- a/drivers/mfd/da9052-core.c
+++ b/drivers/mfd/da9052-core.c
@@ -16,6 +16,7 @@
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/mfd/core.h>
#include <linux/slab.h>
#include <linux/module.h>
@@ -364,6 +365,52 @@ static const int32_t tbat_lookup[255] = {
-11823, -11903, -11982
};
+static void da9052_irq_enable(struct irq_data *data)
+{
+}
+
+static void da9052_irq_disable(struct irq_data *data)
+{
+}
+
+static struct irq_chip da9052_irq_chip = {
+ .name = "da9052",
+ .irq_disable = da9052_irq_disable,
+ .irq_enable = da9052_irq_enable,
+};
+
+static int da9052_irq_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ struct regmap_irq_chip_data *data = h->host_data;
+
+ irq_set_chip_data(virq, data);
+ irq_set_chip_and_handler(virq, &da9052_irq_chip, handle_edge_irq);
+ irq_set_nested_thread(virq, 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(virq, IRQF_VALID);
+#else
+ irq_set_noprobe(virq);
+#endif
+
+ return 0;
+}
+
+static struct irq_domain_ops da9052_domain_ops = {
+ .map = da9052_irq_map,
+ .xlate = irq_domain_xlate_twocell,
+};
+
+static int da9052_map_irq(struct da9052 *da9052, int irq)
+{
+ return regmap_irq_get_virq(da9052->irq_data, irq);
+}
+
static const u8 chan_mux[DA9052_ADC_VBBAT + 1] = {
[DA9052_ADC_VDDOUT] = DA9052_ADC_MAN_MUXSEL_VDDOUT,
[DA9052_ADC_ICH] = DA9052_ADC_MAN_MUXSEL_ICH,
@@ -772,7 +819,7 @@ EXPORT_SYMBOL_GPL(da9052_regmap_config);
int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
{
struct da9052_pdata *pdata = da9052->dev->platform_data;
- int ret;
+ int ret, i;
mutex_init(&da9052->auxadc_lock);
init_completion(&da9052->done);
@@ -782,35 +829,44 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
da9052->chip_id = chip_id;
- if (!pdata || !pdata->irq_base)
- da9052->irq_base = -1;
- else
- da9052->irq_base = pdata->irq_base;
+ /* Allocate a virtual IRQ domain to distribute to the regmap domains */
+ da9052->virq = irq_domain_add_linear(NULL, ARRAY_SIZE(da9052_irqs),
+ &da9052_domain_ops, da9052);
+ if (!da9052->virq) {
+ ret = -EINVAL;
+ goto regmap_err;
+ }
- ret = regmap_add_irq_chip(da9052->regmap, da9052->chip_irq,
+ ret = regmap_add_irq_chip(da9052->regmap,
+ irq_create_mapping(da9052->virq, 0),
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
- da9052->irq_base, &da9052_regmap_irq_chip,
+ -1, &da9052_regmap_irq_chip,
&da9052->irq_data);
- if (ret < 0)
+ if (ret < 0) {
+ dev_err(da9052->dev, "regmap_add_irq_chip failed: %d\n", ret);
goto regmap_err;
+ }
- da9052->irq_base = regmap_irq_chip_get_base(da9052->irq_data);
-
- ret = request_threaded_irq(DA9052_IRQ_ADC_EOM, NULL, da9052_auxadc_irq,
+ i = da9052_map_irq(da9052, DA9052_IRQ_ADC_EOM);
+ ret = request_threaded_irq(i, NULL, da9052_auxadc_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
- "adc irq", da9052);
+ "adc-irq", da9052);
if (ret != 0)
dev_err(da9052->dev, "DA9052 ADC IRQ failed ret=%d\n", ret);
ret = mfd_add_devices(da9052->dev, -1, da9052_subdev_info,
ARRAY_SIZE(da9052_subdev_info), NULL, 0, NULL);
- if (ret)
+ if (ret) {
+ dev_err(da9052->dev, "mfd_add_devices failed: %d\n", ret);
goto err;
+ }
return 0;
err:
- free_irq(DA9052_IRQ_ADC_EOM, da9052);
+ free_irq(da9052_map_irq(da9052, DA9052_IRQ_ADC_EOM), da9052);
+ regmap_del_irq_chip(irq_create_mapping(da9052->virq, 0),
+ da9052->irq_data);
mfd_remove_devices(da9052->dev);
regmap_err:
return ret;
@@ -818,8 +874,9 @@ regmap_err:
void da9052_device_exit(struct da9052 *da9052)
{
- free_irq(DA9052_IRQ_ADC_EOM, da9052);
- regmap_del_irq_chip(da9052->chip_irq, da9052->irq_data);
+ free_irq(da9052_map_irq(da9052, DA9052_IRQ_ADC_EOM), da9052);
+ regmap_del_irq_chip(irq_create_mapping(da9052->virq, 0),
+ da9052->irq_data);
mfd_remove_devices(da9052->dev);
}
diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
index 0507c4c..7fbcb6d 100644
--- a/include/linux/mfd/da9052/da9052.h
+++ b/include/linux/mfd/da9052/da9052.h
@@ -99,6 +99,7 @@ struct da9052 {
u8 chip_id;
int chip_irq;
+ struct irq_domain *virq;
};
/* ADC API */
--
1.7.9.5
--
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