5 files changed, 94 insertions, 133 deletions

diff --git a/drivers/hwmon/ams/ams-core.c b/drivers/hwmon/ams/ams-core.c
index fbefa82a015..6c9ace1b76f 100644
--- a/drivers/hwmon/ams/ams-core.c
+++ b/drivers/hwmon/ams/ams-core.c
@@ -99,39 +99,31 @@ static struct pmf_irq_client ams_shock_client = {
  */
 static void ams_worker(struct work_struct *work)
 {
-	mutex_lock(&ams_info.lock);
-
-	if (ams_info.has_device) {
-		unsigned long flags;
+	unsigned long flags;
+	u8 irqs_to_clear;
 
-		spin_lock_irqsave(&ams_info.irq_lock, flags);
+	mutex_lock(&ams_info.lock);
 
-		if (ams_info.worker_irqs & AMS_IRQ_FREEFALL) {
-			if (verbose)
-				printk(KERN_INFO "ams: freefall detected!\n");
+	spin_lock_irqsave(&ams_info.irq_lock, flags);
+	irqs_to_clear = ams_info.worker_irqs;
 
-			ams_info.worker_irqs &= ~AMS_IRQ_FREEFALL;
+	if (ams_info.worker_irqs & AMS_IRQ_FREEFALL) {
+		if (verbose)
+			printk(KERN_INFO "ams: freefall detected!\n");
 
-			/* we must call this with interrupts enabled */
-			spin_unlock_irqrestore(&ams_info.irq_lock, flags);
-			ams_info.clear_irq(AMS_IRQ_FREEFALL);
-			spin_lock_irqsave(&ams_info.irq_lock, flags);
-		}
+		ams_info.worker_irqs &= ~AMS_IRQ_FREEFALL;
+	}
 
-		if (ams_info.worker_irqs & AMS_IRQ_SHOCK) {
-			if (verbose)
-				printk(KERN_INFO "ams: shock detected!\n");
+	if (ams_info.worker_irqs & AMS_IRQ_SHOCK) {
+		if (verbose)
+			printk(KERN_INFO "ams: shock detected!\n");
 
-			ams_info.worker_irqs &= ~AMS_IRQ_SHOCK;
+		ams_info.worker_irqs &= ~AMS_IRQ_SHOCK;
+	}
 
-			/* we must call this with interrupts enabled */
-			spin_unlock_irqrestore(&ams_info.irq_lock, flags);
-			ams_info.clear_irq(AMS_IRQ_SHOCK);
-			spin_lock_irqsave(&ams_info.irq_lock, flags);
-		}
+	spin_unlock_irqrestore(&ams_info.irq_lock, flags);
 
-		spin_unlock_irqrestore(&ams_info.irq_lock, flags);
-	}
+	ams_info.clear_irq(irqs_to_clear);
 
 	mutex_unlock(&ams_info.lock);
 }
@@ -223,34 +215,28 @@ int __init ams_init(void)
 
 void ams_exit(void)
 {
-	mutex_lock(&ams_info.lock);
-
-	if (ams_info.has_device) {
-		/* Remove input device */
-		ams_input_exit();
+	/* Remove input device */
+	ams_input_exit();
 
-		/* Shut down implementation */
-		ams_info.exit();
-
-		/* Flush interrupt worker
-		 *
-		 * We do this after ams_info.exit(), because an interrupt might
-		 * have arrived before disabling them.
-		 */
-		flush_scheduled_work();
+	/* Remove attributes */
+	device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
 
-		/* Remove attributes */
-		device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
+	/* Shut down implementation */
+	ams_info.exit();
 
-		/* Remove device */
-		of_device_unregister(ams_info.of_dev);
+	/* Flush interrupt worker
+	 *
+	 * We do this after ams_info.exit(), because an interrupt might
+	 * have arrived before disabling them.
+	 */
+	flush_scheduled_work();
 
-		/* Remove handler */
-		pmf_unregister_irq_client(&ams_shock_client);
-		pmf_unregister_irq_client(&ams_freefall_client);
-	}
+	/* Remove device */
+	of_device_unregister(ams_info.of_dev);
 
-	mutex_unlock(&ams_info.lock);
+	/* Remove handler */
+	pmf_unregister_irq_client(&ams_shock_client);
+	pmf_unregister_irq_client(&ams_freefall_client);
 }
 
 MODULE_AUTHOR("Stelian Pop, Michael Hanselmann");
diff --git a/drivers/hwmon/ams/ams-i2c.c b/drivers/hwmon/ams/ams-i2c.c
index 957760536a4..2cbf8a6506c 100644
--- a/drivers/hwmon/ams/ams-i2c.c
+++ b/drivers/hwmon/ams/ams-i2c.c
@@ -60,26 +60,34 @@ enum ams_i2c_cmd {
 	AMS_CMD_START,
 };
 
-static int ams_i2c_attach(struct i2c_adapter *adapter);
-static int ams_i2c_detach(struct i2c_adapter *adapter);
+static int ams_i2c_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id);
+static int ams_i2c_remove(struct i2c_client *client);
+
+static const struct i2c_device_id ams_id[] = {
+	{ "ams", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ams_id);
 
 static struct i2c_driver ams_i2c_driver = {
 	.driver = {
 		.name   = "ams",
 		.owner  = THIS_MODULE,
 	},
-	.attach_adapter = ams_i2c_attach,
-	.detach_adapter = ams_i2c_detach,
+	.probe          = ams_i2c_probe,
+	.remove         = ams_i2c_remove,
+	.id_table       = ams_id,
 };
 
 static s32 ams_i2c_read(u8 reg)
 {
-	return i2c_smbus_read_byte_data(&ams_info.i2c_client, reg);
+	return i2c_smbus_read_byte_data(ams_info.i2c_client, reg);
 }
 
 static int ams_i2c_write(u8 reg, u8 value)
 {
-	return i2c_smbus_write_byte_data(&ams_info.i2c_client, reg, value);
+	return i2c_smbus_write_byte_data(ams_info.i2c_client, reg, value);
 }
 
 static int ams_i2c_cmd(enum ams_i2c_cmd cmd)
@@ -152,9 +160,9 @@ static void ams_i2c_get_xyz(s8 *x, s8 *y, s8 *z)
 	*z = ams_i2c_read(AMS_DATAZ);
 }
 
-static int ams_i2c_attach(struct i2c_adapter *adapter)
+static int ams_i2c_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
 {
-	unsigned long bus;
 	int vmaj, vmin;
 	int result;
 
@@ -162,17 +170,7 @@ static int ams_i2c_attach(struct i2c_adapter *adapter)
 	if (unlikely(ams_info.has_device))
 		return -ENODEV;
 
-	if (strncmp(adapter->name, "uni-n", 5))
-		return -ENODEV;
-
-	bus = simple_strtoul(adapter->name + 6, NULL, 10);
-	if (bus != ams_info.i2c_bus)
-		return -ENODEV;
-
-	ams_info.i2c_client.addr = ams_info.i2c_address;
-	ams_info.i2c_client.adapter = adapter;
-	ams_info.i2c_client.driver = &ams_i2c_driver;
-	strcpy(ams_info.i2c_client.name, "Apple Motion Sensor");
+	ams_info.i2c_client = client;
 
 	if (ams_i2c_cmd(AMS_CMD_RESET)) {
 		printk(KERN_INFO "ams: Failed to reset the device\n");
@@ -237,7 +235,7 @@ static int ams_i2c_attach(struct i2c_adapter *adapter)
 	return 0;
 }
 
-static int ams_i2c_detach(struct i2c_adapter *adapter)
+static int ams_i2c_remove(struct i2c_client *client)
 {
 	if (ams_info.has_device) {
 		/* Disable interrupts */
@@ -261,11 +259,7 @@ static void ams_i2c_exit(void)
 
 int __init ams_i2c_init(struct device_node *np)
 {
-	char *tmp_bus;
 	int result;
-	const u32 *prop;
-
-	mutex_lock(&ams_info.lock);
 
 	/* Set implementation stuff */
 	ams_info.of_node = np;
@@ -275,25 +269,7 @@ int __init ams_i2c_init(struct device_node *np)
 	ams_info.clear_irq = ams_i2c_clear_irq;
 	ams_info.bustype = BUS_I2C;
 
-	/* look for bus either using "reg" or by path */
-	prop = of_get_property(ams_info.of_node, "reg", NULL);
-	if (!prop) {
-		result = -ENODEV;
-
-		goto exit;
-	}
-
-	tmp_bus = strstr(ams_info.of_node->full_name, "/i2c-bus@");
-	if (tmp_bus)
-		ams_info.i2c_bus = *(tmp_bus + 9) - '0';
-	else
-		ams_info.i2c_bus = ((*prop) >> 8) & 0x0f;
-	ams_info.i2c_address = ((*prop) & 0xff) >> 1;
-
 	result = i2c_add_driver(&ams_i2c_driver);
 
-exit:
-	mutex_unlock(&ams_info.lock);
-
 	return result;
 }
diff --git a/drivers/hwmon/ams/ams-input.c b/drivers/hwmon/ams/ams-input.c
index 7b81e0c2c2d..8a712392cd3 100644
--- a/drivers/hwmon/ams/ams-input.c
+++ b/drivers/hwmon/ams/ams-input.c
@@ -20,13 +20,15 @@
 #include "ams.h"
 
 static unsigned int joystick;
-module_param(joystick, bool, 0644);
+module_param(joystick, bool, S_IRUGO);
 MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
 
 static unsigned int invert;
-module_param(invert, bool, 0644);
+module_param(invert, bool, S_IWUSR | S_IRUGO);
 MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
 
+static DEFINE_MUTEX(ams_input_mutex);
+
 static void ams_idev_poll(struct input_polled_dev *dev)
 {
 	struct input_dev *idev = dev->input;
@@ -50,13 +52,11 @@ static void ams_idev_poll(struct input_polled_dev *dev)
 }
 
 /* Call with ams_info.lock held! */
-static void ams_input_enable(void)
+static int ams_input_enable(void)
 {
 	struct input_dev *input;
 	s8 x, y, z;
-
-	if (ams_info.idev)
-		return;
+	int error;
 
 	ams_sensors(&x, &y, &z);
 	ams_info.xcalib = x;
@@ -65,7 +65,7 @@ static void ams_input_enable(void)
 
 	ams_info.idev = input_allocate_polled_device();
 	if (!ams_info.idev)
-		return;
+		return -ENOMEM;
 
 	ams_info.idev->poll = ams_idev_poll;
 	ams_info.idev->poll_interval = 25;
@@ -84,14 +84,18 @@ static void ams_input_enable(void)
 	set_bit(EV_KEY, input->evbit);
 	set_bit(BTN_TOUCH, input->keybit);
 
-	if (input_register_polled_device(ams_info.idev)) {
+	error = input_register_polled_device(ams_info.idev);
+	if (error) {
 		input_free_polled_device(ams_info.idev);
 		ams_info.idev = NULL;
-		return;
+		return error;
 	}
+
+	joystick = 1;
+
+	return 0;
 }
 
-/* Call with ams_info.lock held! */
 static void ams_input_disable(void)
 {
 	if (ams_info.idev) {
@@ -99,6 +103,8 @@ static void ams_input_disable(void)
 		input_free_polled_device(ams_info.idev);
 		ams_info.idev = NULL;
 	}
+
+	joystick = 0;
 }
 
 static ssize_t ams_input_show_joystick(struct device *dev,
@@ -110,39 +116,42 @@ static ssize_t ams_input_show_joystick(struct device *dev,
 static ssize_t ams_input_store_joystick(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
 {
-	if (sscanf(buf, "%d\n", &joystick) != 1)
+	unsigned long enable;
+	int error = 0;
+
+	if (strict_strtoul(buf, 0, &enable) || enable > 1)
 		return -EINVAL;
 
-	mutex_lock(&ams_info.lock);
+	mutex_lock(&ams_input_mutex);
 
-	if (joystick)
-		ams_input_enable();
-	else
-		ams_input_disable();
+	if (enable != joystick) {
+		if (enable)
+			error = ams_input_enable();
+		else
+			ams_input_disable();
+	}
 
-	mutex_unlock(&ams_info.lock);
+	mutex_unlock(&ams_input_mutex);
 
-	return count;
+	return error ? error : count;
 }
 
 static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
 	ams_input_show_joystick, ams_input_store_joystick);
 
-/* Call with ams_info.lock held! */
 int ams_input_init(void)
 {
-	int result;
-
-	result = device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
-
-	if (!result && joystick)
+	if (joystick)
 		ams_input_enable();
-	return result;
+
+	return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
 }
 
-/* Call with ams_info.lock held! */
 void ams_input_exit(void)
 {
-	ams_input_disable();
 	device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
+
+	mutex_lock(&ams_input_mutex);
+	ams_input_disable();
+	mutex_unlock(&ams_input_mutex);
 }
diff --git a/drivers/hwmon/ams/ams-pmu.c b/drivers/hwmon/ams/ams-pmu.c
index 9463e9768f6..fb18b3d3162 100644
--- a/drivers/hwmon/ams/ams-pmu.c
+++ b/drivers/hwmon/ams/ams-pmu.c
@@ -149,8 +149,6 @@ int __init ams_pmu_init(struct device_node *np)
 	const u32 *prop;
 	int result;
 
-	mutex_lock(&ams_info.lock);
-
 	/* Set implementation stuff */
 	ams_info.of_node = np;
 	ams_info.exit = ams_pmu_exit;
@@ -161,10 +159,9 @@ int __init ams_pmu_init(struct device_node *np)
 
 	/* Get PMU command, should be 0x4e, but we can never know */
 	prop = of_get_property(ams_info.of_node, "reg", NULL);
-	if (!prop) {
-		result = -ENODEV;
-		goto exit;
-	}
+	if (!prop)
+		return -ENODEV;
+
 	ams_pmu_cmd = ((*prop) >> 8) & 0xff;
 
 	/* Disable interrupts */
@@ -175,7 +172,7 @@ int __init ams_pmu_init(struct device_node *np)
 
 	result = ams_sensor_attach();
 	if (result < 0)
-		goto exit;
+		return result;
 
 	/* Set default values */
 	ams_pmu_set_register(AMS_FF_LOW_LIMIT, 0x15);
@@ -198,10 +195,5 @@ int __init ams_pmu_init(struct device_node *np)
 
 	printk(KERN_INFO "ams: Found PMU based motion sensor\n");
 
-	result = 0;
-
-exit:
-	mutex_unlock(&ams_info.lock);
-
-	return result;
+	return 0;
 }
diff --git a/drivers/hwmon/ams/ams.h b/drivers/hwmon/ams/ams.h
index 221ef6915a5..5ed387b0bd9 100644
--- a/drivers/hwmon/ams/ams.h
+++ b/drivers/hwmon/ams/ams.h
@@ -46,9 +46,7 @@ struct ams {
 
 #ifdef CONFIG_SENSORS_AMS_I2C
 	/* I2C properties */
-	int i2c_bus;
-	int i2c_address;
-	struct i2c_client i2c_client;
+	struct i2c_client *i2c_client;
 #endif
 
 	/* Joystick emulation */