On 06/16/2016 02:41 PM, Marcin Niestroj wrote:
Add support for handling IRQs: power button, AC and USB power state
changes. Mask and interrupt bits are shared within one register, which
prevents us to use regmap_irq implementation. New irq_domain is created in
order to add interrupt handling for each tps65217's subsystem. IRQ
resources have been added for charger subsystem to be able to notify about
AC and USB state changes.
Signed-off-by: Marcin Niestroj <m.niestroj@xxxxxxxxxxxxxxxx>
---
drivers/mfd/Kconfig | 1 +
drivers/mfd/tps65217.c | 194 +++++++++++++++++++++++++++++++++++++++++--
include/linux/mfd/tps65217.h | 11 +++
3 files changed, 198 insertions(+), 8 deletions(-)
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1bcf601..f8c9580 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1200,6 +1200,7 @@ config MFD_TPS65217
depends on I2C
select MFD_CORE
select REGMAP_I2C
+ select IRQ_DOMAIN
help
If you say yes here you get support for the TPS65217 series of
Power Management / White LED chips.
diff --git a/drivers/mfd/tps65217.c b/drivers/mfd/tps65217.c
index 049a6fc..7763dbc 100644
--- a/drivers/mfd/tps65217.c
+++ b/drivers/mfd/tps65217.c
@@ -15,22 +15,99 @@
* GNU General Public License for more details.
*/
-#include <linux/kernel.h>
#include <linux/device.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
+#include <linux/err.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/i2c.h>
-#include <linux/slab.h>
-#include <linux/regmap.h>
-#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>
-static const struct mfd_cell tps65217s[] = {
+static struct resource charger_resources[] = {
+ DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"),
+ DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"),
+};
+
+struct tps65217_irq {
+ int mask;
+ int interrupt;
+};
+
+static const struct tps65217_irq tps65217_irqs[] = {
+ [TPS65217_IRQ_PB] = {
+ .mask = TPS65217_INT_PBM,
+ .interrupt = TPS65217_INT_PBI,
+ },
+ [TPS65217_IRQ_AC] = {
+ .mask = TPS65217_INT_ACM,
+ .interrupt = TPS65217_INT_ACI,
+ },
+ [TPS65217_IRQ_USB] = {
+ .mask = TPS65217_INT_USBM,
+ .interrupt = TPS65217_INT_USBI,
+ },
+};
+
+static void tps65217_irq_lock(struct irq_data *data)
+{
+ struct tps65217 *tps = irq_data_get_irq_chip_data(data);
+
+ mutex_lock(&tps->irq_lock);
+}
+
+static void tps65217_irq_sync_unlock(struct irq_data *data)
+{
+ struct tps65217 *tps = irq_data_get_irq_chip_data(data);
+ int ret;
+
+ ret = tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
+ TPS65217_PROTECT_NONE);
+ if (ret != 0)
+ dev_err(tps->dev, "Failed to sync IRQ masks\n");
+
+ mutex_unlock(&tps->irq_lock);
+}
+
+static const inline struct tps65217_irq *
+irq_to_tps65217_irq(struct tps65217 *tps, struct irq_data *data)
+{
+ return &tps65217_irqs[data->hwirq];
+}
+
+static void tps65217_irq_enable(struct irq_data *data)
+{
+ struct tps65217 *tps = irq_data_get_irq_chip_data(data);
+ const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);
+
+ tps->irq_mask &= ~irq_data->mask;
+}
+
+static void tps65217_irq_disable(struct irq_data *data)
+{
+ struct tps65217 *tps = irq_data_get_irq_chip_data(data);
+ const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);
+
+ tps->irq_mask |= irq_data->mask;
+}
+
+static struct irq_chip tps65217_irq_chip = {
+ .irq_bus_lock = tps65217_irq_lock,
+ .irq_bus_sync_unlock = tps65217_irq_sync_unlock,
+ .irq_enable = tps65217_irq_enable,
+ .irq_disable = tps65217_irq_disable,
+};
+
+static struct mfd_cell tps65217s[] = {
{
.name = "tps65217-pmic",
.of_compatible = "ti,tps65217-pmic",
@@ -41,10 +118,89 @@ static const struct mfd_cell tps65217s[] = {
},
{
.name = "tps65217-charger",
+ .num_resources = ARRAY_SIZE(charger_resources),
+ .resources = charger_resources,
.of_compatible = "ti,tps65217-charger",
},
};
+static irqreturn_t tps65217_irq_thread(int irq, void *data)
+{
+ struct tps65217 *tps = data;
+ unsigned int status;
+ bool handled = false;
+ int i;
+ int ret;
+
+ ret = tps65217_reg_read(tps, TPS65217_REG_INT, &status);
+ if (ret < 0) {
+ dev_err(tps->dev, "Failed to read IRQ status: %d\n",
+ ret);
+ return IRQ_NONE;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(tps65217_irqs); i++) {
+ if (status & tps65217_irqs[i].interrupt) {
+ handle_nested_irq(irq_find_mapping(tps->irq_domain, i));
+ handled = true;
+ }
+ }
+
+ if (handled)
+ return IRQ_HANDLED;
+
+ return IRQ_NONE;
+}
+
+static int tps65217_irq_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ struct tps65217 *tps = h->host_data;
+
+ irq_set_chip_data(virq, tps);
+ irq_set_chip_and_handler(virq, &tps65217_irq_chip, handle_edge_irq);
+ irq_set_nested_thread(virq, 1);
+ irq_set_noprobe(virq);
irq_set_parent()?
+
+ return 0;
+}
+
+static const struct irq_domain_ops tps65217_irq_domain_ops = {
+ .map = tps65217_irq_map,
+};
+
+static int tps65217_irq_init(struct tps65217 *tps, int irq)
+{
+ int ret;
+
+ mutex_init(&tps->irq_lock);
+
+ /* Mask all interrupt sources */
+ tps->irq_mask = (TPS65217_INT_RESERVEDM | TPS65217_INT_PBM
+ | TPS65217_INT_ACM | TPS65217_INT_USBM);
+ tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
+ TPS65217_PROTECT_NONE);
+
+ tps->irq_domain = irq_domain_add_linear(tps->dev->of_node,
+ TPS65217_NUM_IRQ, &tps65217_irq_domain_ops, tps);
+ if (!tps->irq_domain) {
+ dev_err(tps->dev, "Could not create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ ret = devm_request_threaded_irq(tps->dev, irq, NULL,
+ tps65217_irq_thread,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
Are there any reasons why IRQ trigger type specified here explicitly?
+ "tps65217-irq", tps);
+ if (ret) {
+ dev_err(tps->dev, "Failed to request IRQ %d: %d\n",
+ irq, ret);
+ return ret;
+ }
+
+ return 0;
+}
--
regards,
-grygorii
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