Input: synaptics-rmi4 - move IRQ handling to rmi_driver

The attn IRQ is related to the chip, rather than the transport, so move
all handling of interrupts to the core driver. This also makes sure that
there are no races between interrupts and availability of the resources
used by the core driver.

Signed-off-by: Bjorn Andersson <[e-mail]>
Signed-off-by: Benjamin Tissoires <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/rmi4/rmi_driver.c

···
 #include <linux/bitmap.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
+#include <linux/irq.h>
 #include <linux/kconfig.h>
 #include <linux/pm.h>
 #include <linux/slab.h>
···
 	}
 }
 
-int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
+static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
 {
 	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
 	struct device *dev = &rmi_dev->dev;
···
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(rmi_process_interrupt_requests);
+
+static irqreturn_t rmi_irq_fn(int irq, void *dev_id)
+{
+	struct rmi_device *rmi_dev = dev_id;
+	int ret;
+
+	ret = rmi_process_interrupt_requests(rmi_dev);
+	if (ret)
+		rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev,
+			"Failed to process interrupt request: %d\n", ret);
+
+	return IRQ_HANDLED;
+}
+
+static int rmi_irq_init(struct rmi_device *rmi_dev)
+{
+	struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
+	int irq_flags = irq_get_trigger_type(pdata->irq);
+	int ret;
+
+	if (!irq_flags)
+		irq_flags = IRQF_TRIGGER_LOW;
+
+	ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL,
+					rmi_irq_fn, irq_flags | IRQF_ONESHOT,
+					dev_name(rmi_dev->xport->dev),
+					rmi_dev);
+	if (ret < 0) {
+		dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n",
+			pdata->irq);
+
+		return ret;
+	}
+
+	return 0;
+}
 
 static int suspend_one_function(struct rmi_function *fn)
 {
···
 	return error;
 }
 
-int rmi_driver_suspend(struct rmi_device *rmi_dev)
+int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake)
 {
+	struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
+	int irq = pdata->irq;
 	int retval = 0;
 
 	retval = rmi_suspend_functions(rmi_dev);
···
 		dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n",
 			retval);
 
+	disable_irq(irq);
+	if (enable_wake && device_may_wakeup(rmi_dev->xport->dev)) {
+		retval = enable_irq_wake(irq);
+		if (!retval)
+			dev_warn(&rmi_dev->dev,
+				 "Failed to enable irq for wake: %d\n",
+				 retval);
+	}
 	return retval;
 }
 EXPORT_SYMBOL_GPL(rmi_driver_suspend);
 
-int rmi_driver_resume(struct rmi_device *rmi_dev)
+int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake)
 {
+	struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
+	int irq = pdata->irq;
 	int retval;
+
+	enable_irq(irq);
+	if (clear_wake && device_may_wakeup(rmi_dev->xport->dev)) {
+		retval = disable_irq_wake(irq);
+		if (!retval)
+			dev_warn(&rmi_dev->dev,
+				 "Failed to disable irq for wake: %d\n",
+				 retval);
+	}
 
 	retval = rmi_resume_functions(rmi_dev);
 	if (retval)
···
 static int rmi_driver_remove(struct device *dev)
 {
 	struct rmi_device *rmi_dev = to_rmi_device(dev);
+	struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
+	int irq = pdata->irq;
+
+	disable_irq(irq);
 
 	rmi_free_function_list(rmi_dev);
 
···
 			}
 		}
 	}
+
+	retval = rmi_irq_init(rmi_dev);
+	if (retval < 0)
+		goto err_destroy_functions;
 
 	if (data->f01_container->dev.driver)
 		/* Driver already bound, so enable ATTN now. */

drivers/input/rmi4/rmi_i2c.c

···
 
 #include <linux/i2c.h>
 #include <linux/rmi.h>
-#include <linux/irq.h>
 #include <linux/of.h>
 #include <linux/delay.h>
 #include <linux/regulator/consumer.h>
···
 
 	struct mutex page_mutex;
 	int page;
-
-	int irq;
 
 	u8 *tx_buf;
 	size_t tx_buf_size;
···
 	.read_block	= rmi_i2c_read_block,
 };
 
-static irqreturn_t rmi_i2c_irq(int irq, void *dev_id)
-{
-	struct rmi_i2c_xport *rmi_i2c = dev_id;
-	struct rmi_device *rmi_dev = rmi_i2c->xport.rmi_dev;
-	int ret;
-
-	ret = rmi_process_interrupt_requests(rmi_dev);
-	if (ret)
-		rmi_dbg(RMI_DEBUG_XPORT, &rmi_dev->dev,
-			"Failed to process interrupt request: %d\n", ret);
-
-	return IRQ_HANDLED;
-}
-
-static int rmi_i2c_init_irq(struct i2c_client *client)
-{
-	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
-	int irq_flags = irqd_get_trigger_type(irq_get_irq_data(rmi_i2c->irq));
-	int ret;
-
-	if (!irq_flags)
-		irq_flags = IRQF_TRIGGER_LOW;
-
-	ret = devm_request_threaded_irq(&client->dev, rmi_i2c->irq, NULL,
-			rmi_i2c_irq, irq_flags | IRQF_ONESHOT, client->name,
-			rmi_i2c);
-	if (ret < 0) {
-		dev_warn(&client->dev, "Failed to register interrupt %d\n",
-			rmi_i2c->irq);
-
-		return ret;
-	}
-
-	return 0;
-}
-
 #ifdef CONFIG_OF
 static const struct of_device_id rmi_i2c_of_match[] = {
 	{ .compatible = "syna,rmi4-i2c" },
···
 	if (!client->dev.of_node && client_pdata)
 		*pdata = *client_pdata;
 
-	if (client->irq > 0)
-		rmi_i2c->irq = client->irq;
+	pdata->irq = client->irq;
 
 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s.\n",
 			dev_name(&client->dev));
···
 		return retval;
 	}
 
-	retval = rmi_i2c_init_irq(client);
-	if (retval < 0)
-		return retval;
-
 	dev_info(&client->dev, "registered rmi i2c driver at %#04x.\n",
 			client->addr);
 	return 0;
···
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 	int ret;
 
-	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev);
+	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev, true);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
-
-	disable_irq(rmi_i2c->irq);
-	if (device_may_wakeup(&client->dev)) {
-		ret = enable_irq_wake(rmi_i2c->irq);
-		if (!ret)
-			dev_warn(dev, "Failed to enable irq for wake: %d\n",
-				ret);
-	}
 
 	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
 			       rmi_i2c->supplies);
···
 
 	msleep(rmi_i2c->startup_delay);
 
-	enable_irq(rmi_i2c->irq);
-	if (device_may_wakeup(&client->dev)) {
-		ret = disable_irq_wake(rmi_i2c->irq);
-		if (!ret)
-			dev_warn(dev, "Failed to disable irq for wake: %d\n",
-				ret);
-	}
-
-	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
+	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev, true);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
 
···
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 	int ret;
 
-	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev);
+	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev, false);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
-
-	disable_irq(rmi_i2c->irq);
 
 	regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
 			       rmi_i2c->supplies);
···
 
 	msleep(rmi_i2c->startup_delay);
 
-	enable_irq(rmi_i2c->irq);
-
-	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
+	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev, false);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
 

drivers/input/rmi4/rmi_spi.c

···
 #include <linux/rmi.h>
 #include <linux/slab.h>
 #include <linux/spi/spi.h>
-#include <linux/irq.h>
 #include <linux/of.h>
 #include "rmi_driver.h"
 
···
 
 	struct mutex page_mutex;
 	int page;
-
-	int irq;
 
 	u8 *rx_buf;
 	u8 *tx_buf;
···
 	.read_block	= rmi_spi_read_block,
 };
 
-static irqreturn_t rmi_spi_irq(int irq, void *dev_id)
-{
-	struct rmi_spi_xport *rmi_spi = dev_id;
-	struct rmi_device *rmi_dev = rmi_spi->xport.rmi_dev;
-	int ret;
-
-	ret = rmi_process_interrupt_requests(rmi_dev);
-	if (ret)
-		rmi_dbg(RMI_DEBUG_XPORT, &rmi_dev->dev,
-			"Failed to process interrupt request: %d\n", ret);
-
-	return IRQ_HANDLED;
-}
-
-static int rmi_spi_init_irq(struct spi_device *spi)
-{
-	struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
-	int irq_flags = irqd_get_trigger_type(irq_get_irq_data(rmi_spi->irq));
-	int ret;
-
-	if (!irq_flags)
-		irq_flags = IRQF_TRIGGER_LOW;
-
-	ret = devm_request_threaded_irq(&spi->dev, rmi_spi->irq, NULL,
-			rmi_spi_irq, irq_flags | IRQF_ONESHOT,
-			dev_name(&spi->dev), rmi_spi);
-	if (ret < 0) {
-		dev_warn(&spi->dev, "Failed to register interrupt %d\n",
-			rmi_spi->irq);
-		return ret;
-	}
-
-	return 0;
-}
-
 #ifdef CONFIG_OF
 static int rmi_spi_of_probe(struct spi_device *spi,
 			struct rmi_device_platform_data *pdata)
···
 		return retval;
 	}
 
-	if (spi->irq > 0)
-		rmi_spi->irq = spi->irq;
+	pdata->irq = spi->irq;
 
 	rmi_spi->spi = spi;
 	mutex_init(&rmi_spi->page_mutex);
···
 		return retval;
 	}
 
-	retval = rmi_spi_init_irq(spi);
-	if (retval < 0)
-		return retval;
-
 	dev_info(&spi->dev, "registered RMI SPI driver\n");
 	return 0;
 }
···
 	struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
 	int ret;
 
-	ret = rmi_driver_suspend(rmi_spi->xport.rmi_dev);
+	ret = rmi_driver_suspend(rmi_spi->xport.rmi_dev, true);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
 
-	disable_irq(rmi_spi->irq);
-	if (device_may_wakeup(&spi->dev)) {
-		ret = enable_irq_wake(rmi_spi->irq);
-		if (!ret)
-			dev_warn(dev, "Failed to enable irq for wake: %d\n",
-				ret);
-	}
 	return ret;
 }
 
···
 	struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
 	int ret;
 
-	enable_irq(rmi_spi->irq);
-	if (device_may_wakeup(&spi->dev)) {
-		ret = disable_irq_wake(rmi_spi->irq);
-		if (!ret)
-			dev_warn(dev, "Failed to disable irq for wake: %d\n",
-				ret);
-	}
-
-	ret = rmi_driver_resume(rmi_spi->xport.rmi_dev);
+	ret = rmi_driver_resume(rmi_spi->xport.rmi_dev, true);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
 
···
 	struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
 	int ret;
 
-	ret = rmi_driver_suspend(rmi_spi->xport.rmi_dev);
+	ret = rmi_driver_suspend(rmi_spi->xport.rmi_dev, false);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
-
-	disable_irq(rmi_spi->irq);
 
 	return 0;
 }
···
 	struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
 	int ret;
 
-	enable_irq(rmi_spi->irq);
-
-	ret = rmi_driver_resume(rmi_spi->xport.rmi_dev);
+	ret = rmi_driver_resume(rmi_spi->xport.rmi_dev, false);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);
 

include/linux/rmi.h

···
  * @reset_delay_ms - after issuing a reset command to the touch sensor, the
  * driver waits a few milliseconds to give the firmware a chance to
  * to re-initialize.  You can override the default wait period here.
+ * @irq: irq associated with the attn gpio line, or negative
  */
 struct rmi_device_platform_data {
 	int reset_delay_ms;
+	int irq;
 
 	struct rmi_device_platform_data_spi spi_data;
 
···
 
 int rmi_register_transport_device(struct rmi_transport_dev *xport);
 void rmi_unregister_transport_device(struct rmi_transport_dev *xport);
-int rmi_process_interrupt_requests(struct rmi_device *rmi_dev);
 
-int rmi_driver_suspend(struct rmi_device *rmi_dev);
-int rmi_driver_resume(struct rmi_device *rmi_dev);
+int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake);
+int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake);
 #endif