1 files changed, 182 insertions, 137 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 4099b2b8c392..e0f833cca3f1 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -40,12 +40,11 @@
 #include "i2c-core.h"
 
 
-/* core_lock protects i2c_adapter_idr, userspace_devices, and guarantees
+/* core_lock protects i2c_adapter_idr, and guarantees
    that device detection, deletion of detected devices, and attach_adapter
    and detach_adapter calls are serialized */
 static DEFINE_MUTEX(core_lock);
 static DEFINE_IDR(i2c_adapter_idr);
-static LIST_HEAD(userspace_devices);
 
 static struct device_type i2c_client_type;
 static int i2c_check_addr(struct i2c_adapter *adapter, int addr);
@@ -117,8 +116,10 @@ static int i2c_device_probe(struct device *dev)
 	dev_dbg(dev, "probe\n");
 
 	status = driver->probe(client, i2c_match_id(driver->id_table, client));
-	if (status)
+	if (status) {
 		client->driver = NULL;
+		i2c_set_clientdata(client, NULL);
+	}
 	return status;
 }
 
@@ -139,8 +140,10 @@ static int i2c_device_remove(struct device *dev)
 		dev->driver = NULL;
 		status = 0;
 	}
-	if (status == 0)
+	if (status == 0) {
 		client->driver = NULL;
+		i2c_set_clientdata(client, NULL);
+	}
 	return status;
 }
 
@@ -156,106 +159,130 @@ static void i2c_device_shutdown(struct device *dev)
 		driver->shutdown(client);
 }
 
-#ifdef CONFIG_SUSPEND
-static int i2c_device_pm_suspend(struct device *dev)
+#ifdef CONFIG_PM_SLEEP
+static int i2c_legacy_suspend(struct device *dev, pm_message_t mesg)
 {
-	const struct dev_pm_ops *pm;
+	struct i2c_client *client = i2c_verify_client(dev);
+	struct i2c_driver *driver;
 
-	if (!dev->driver)
+	if (!client || !dev->driver)
 		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->suspend)
+	driver = to_i2c_driver(dev->driver);
+	if (!driver->suspend)
 		return 0;
-	return pm->suspend(dev);
+	return driver->suspend(client, mesg);
 }
 
-static int i2c_device_pm_resume(struct device *dev)
+static int i2c_legacy_resume(struct device *dev)
 {
-	const struct dev_pm_ops *pm;
+	struct i2c_client *client = i2c_verify_client(dev);
+	struct i2c_driver *driver;
 
-	if (!dev->driver)
+	if (!client || !dev->driver)
 		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->resume)
+	driver = to_i2c_driver(dev->driver);
+	if (!driver->resume)
 		return 0;
-	return pm->resume(dev);
+	return driver->resume(client);
 }
-#else
-#define i2c_device_pm_suspend	NULL
-#define i2c_device_pm_resume	NULL
-#endif
 
-#ifdef CONFIG_PM_RUNTIME
-static int i2c_device_runtime_suspend(struct device *dev)
+static int i2c_device_pm_suspend(struct device *dev)
 {
-	const struct dev_pm_ops *pm;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (!dev->driver)
-		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->runtime_suspend)
+	if (pm_runtime_suspended(dev))
 		return 0;
-	return pm->runtime_suspend(dev);
-}
 
-static int i2c_device_runtime_resume(struct device *dev)
-{
-	const struct dev_pm_ops *pm;
+	if (pm)
+		return pm->suspend ? pm->suspend(dev) : 0;
 
-	if (!dev->driver)
-		return 0;
-	pm = dev->driver->pm;
-	if (!pm || !pm->runtime_resume)
-		return 0;
-	return pm->runtime_resume(dev);
+	return i2c_legacy_suspend(dev, PMSG_SUSPEND);
 }
 
-static int i2c_device_runtime_idle(struct device *dev)
+static int i2c_device_pm_resume(struct device *dev)
 {
-	const struct dev_pm_ops *pm = NULL;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int ret;
 
-	if (dev->driver)
-		pm = dev->driver->pm;
-	if (pm && pm->runtime_idle) {
-		ret = pm->runtime_idle(dev);
-		if (ret)
-			return ret;
+	if (pm)
+		ret = pm->resume ? pm->resume(dev) : 0;
+	else
+		ret = i2c_legacy_resume(dev);
+
+	if (!ret) {
+		pm_runtime_disable(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
 	}
 
-	return pm_runtime_suspend(dev);
+	return ret;
 }
-#else
-#define i2c_device_runtime_suspend	NULL
-#define i2c_device_runtime_resume	NULL
-#define i2c_device_runtime_idle		NULL
-#endif
 
-static int i2c_device_suspend(struct device *dev, pm_message_t mesg)
+static int i2c_device_pm_freeze(struct device *dev)
 {
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_driver *driver;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (!client || !dev->driver)
+	if (pm_runtime_suspended(dev))
 		return 0;
-	driver = to_i2c_driver(dev->driver);
-	if (!driver->suspend)
-		return 0;
-	return driver->suspend(client, mesg);
+
+	if (pm)
+		return pm->freeze ? pm->freeze(dev) : 0;
+
+	return i2c_legacy_suspend(dev, PMSG_FREEZE);
 }
 
-static int i2c_device_resume(struct device *dev)
+static int i2c_device_pm_thaw(struct device *dev)
 {
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_driver *driver;
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (!client || !dev->driver)
+	if (pm_runtime_suspended(dev))
 		return 0;
-	driver = to_i2c_driver(dev->driver);
-	if (!driver->resume)
+
+	if (pm)
+		return pm->thaw ? pm->thaw(dev) : 0;
+
+	return i2c_legacy_resume(dev);
+}
+
+static int i2c_device_pm_poweroff(struct device *dev)
+{
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+	if (pm_runtime_suspended(dev))
 		return 0;
-	return driver->resume(client);
+
+	if (pm)
+		return pm->poweroff ? pm->poweroff(dev) : 0;
+
+	return i2c_legacy_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int i2c_device_pm_restore(struct device *dev)
+{
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+	int ret;
+
+	if (pm)
+		ret = pm->restore ? pm->restore(dev) : 0;
+	else
+		ret = i2c_legacy_resume(dev);
+
+	if (!ret) {
+		pm_runtime_disable(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+	}
+
+	return ret;
 }
+#else /* !CONFIG_PM_SLEEP */
+#define i2c_device_pm_suspend	NULL
+#define i2c_device_pm_resume	NULL
+#define i2c_device_pm_freeze	NULL
+#define i2c_device_pm_thaw	NULL
+#define i2c_device_pm_poweroff	NULL
+#define i2c_device_pm_restore	NULL
+#endif /* !CONFIG_PM_SLEEP */
 
 static void i2c_client_dev_release(struct device *dev)
 {
@@ -298,9 +325,15 @@ static const struct attribute_group *i2c_dev_attr_groups[] = {
 static const struct dev_pm_ops i2c_device_pm_ops = {
 	.suspend = i2c_device_pm_suspend,
 	.resume = i2c_device_pm_resume,
-	.runtime_suspend = i2c_device_runtime_suspend,
-	.runtime_resume = i2c_device_runtime_resume,
-	.runtime_idle = i2c_device_runtime_idle,
+	.freeze = i2c_device_pm_freeze,
+	.thaw = i2c_device_pm_thaw,
+	.poweroff = i2c_device_pm_poweroff,
+	.restore = i2c_device_pm_restore,
+	SET_RUNTIME_PM_OPS(
+		pm_generic_runtime_suspend,
+		pm_generic_runtime_resume,
+		pm_generic_runtime_idle
+	)
 };
 
 struct bus_type i2c_bus_type = {
@@ -309,8 +342,6 @@ struct bus_type i2c_bus_type = {
 	.probe		= i2c_device_probe,
 	.remove		= i2c_device_remove,
 	.shutdown	= i2c_device_shutdown,
-	.suspend	= i2c_device_suspend,
-	.resume		= i2c_device_resume,
 	.pm		= &i2c_device_pm_ops,
 };
 EXPORT_SYMBOL_GPL(i2c_bus_type);
@@ -541,9 +572,9 @@ i2c_sysfs_new_device(struct device *dev, struct device_attribute *attr,
 		return -EEXIST;
 
 	/* Keep track of the added device */
-	mutex_lock(&core_lock);
-	list_add_tail(&client->detected, &userspace_devices);
-	mutex_unlock(&core_lock);
+	i2c_lock_adapter(adap);
+	list_add_tail(&client->detected, &adap->userspace_clients);
+	i2c_unlock_adapter(adap);
 	dev_info(dev, "%s: Instantiated device %s at 0x%02hx\n", "new_device",
 		 info.type, info.addr);
 
@@ -582,9 +613,10 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr,
 
 	/* Make sure the device was added through sysfs */
 	res = -ENOENT;
-	mutex_lock(&core_lock);
-	list_for_each_entry_safe(client, next, &userspace_devices, detected) {
-		if (client->addr == addr && client->adapter == adap) {
+	i2c_lock_adapter(adap);
+	list_for_each_entry_safe(client, next, &adap->userspace_clients,
+				 detected) {
+		if (client->addr == addr) {
 			dev_info(dev, "%s: Deleting device %s at 0x%02hx\n",
 				 "delete_device", client->name, client->addr);
 
@@ -594,7 +626,7 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr,
 			break;
 		}
 	}
-	mutex_unlock(&core_lock);
+	i2c_unlock_adapter(adap);
 
 	if (res < 0)
 		dev_err(dev, "%s: Can't find device in list\n",
@@ -676,6 +708,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 	}
 
 	rt_mutex_init(&adap->bus_lock);
+	INIT_LIST_HEAD(&adap->userspace_clients);
 
 	/* Set default timeout to 1 second if not already set */
 	if (adap->timeout == 0)
@@ -878,14 +911,15 @@ int i2c_del_adapter(struct i2c_adapter *adap)
 		return res;
 
 	/* Remove devices instantiated from sysfs */
-	list_for_each_entry_safe(client, next, &userspace_devices, detected) {
-		if (client->adapter == adap) {
-			dev_dbg(&adap->dev, "Removing %s at 0x%x\n",
-				client->name, client->addr);
-			list_del(&client->detected);
-			i2c_unregister_device(client);
-		}
+	i2c_lock_adapter(adap);
+	list_for_each_entry_safe(client, next, &adap->userspace_clients,
+				 detected) {
+		dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name,
+			client->addr);
+		list_del(&client->detected);
+		i2c_unregister_device(client);
 	}
+	i2c_unlock_adapter(adap);
 
 	/* Detach any active clients. This can't fail, thus we do not
 	   checking the returned value. */
@@ -1190,10 +1224,10 @@ EXPORT_SYMBOL(i2c_transfer);
  *
  * Returns negative errno, or else the number of bytes written.
  */
-int i2c_master_send(struct i2c_client *client,const char *buf ,int count)
+int i2c_master_send(struct i2c_client *client, const char *buf, int count)
 {
 	int ret;
-	struct i2c_adapter *adap=client->adapter;
+	struct i2c_adapter *adap = client->adapter;
 	struct i2c_msg msg;
 
 	msg.addr = client->addr;
@@ -1217,9 +1251,9 @@ EXPORT_SYMBOL(i2c_master_send);
  *
  * Returns negative errno, or else the number of bytes read.
  */
-int i2c_master_recv(struct i2c_client *client, char *buf ,int count)
+int i2c_master_recv(struct i2c_client *client, char *buf, int count)
 {
-	struct i2c_adapter *adap=client->adapter;
+	struct i2c_adapter *adap = client->adapter;
 	struct i2c_msg msg;
 	int ret;
 
@@ -1263,12 +1297,23 @@ static int i2c_detect_address(struct i2c_client *temp_client,
 		return 0;
 
 	/* Make sure there is something at this address */
-	if (i2c_smbus_xfer(adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) < 0)
-		return 0;
+	if (addr == 0x73 && (adapter->class & I2C_CLASS_HWMON)) {
+		/* Special probe for FSC hwmon chips */
+		union i2c_smbus_data dummy;
 
-	/* Prevent 24RF08 corruption */
-	if ((addr & ~0x0f) == 0x50)
-		i2c_smbus_xfer(adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL);
+		if (i2c_smbus_xfer(adapter, addr, 0, I2C_SMBUS_READ, 0,
+				   I2C_SMBUS_BYTE_DATA, &dummy) < 0)
+			return 0;
+	} else {
+		if (i2c_smbus_xfer(adapter, addr, 0, I2C_SMBUS_WRITE, 0,
+				   I2C_SMBUS_QUICK, NULL) < 0)
+			return 0;
+
+		/* Prevent 24RF08 corruption */
+		if ((addr & ~0x0f) == 0x50)
+			i2c_smbus_xfer(adapter, addr, 0, I2C_SMBUS_WRITE, 0,
+				       I2C_SMBUS_QUICK, NULL);
+	}
 
 	/* Finally call the custom detection function */
 	memset(&info, 0, sizeof(struct i2c_board_info));
@@ -1410,7 +1455,7 @@ i2c_new_probed_device(struct i2c_adapter *adap,
 }
 EXPORT_SYMBOL_GPL(i2c_new_probed_device);
 
-struct i2c_adapter* i2c_get_adapter(int id)
+struct i2c_adapter *i2c_get_adapter(int id)
 {
 	struct i2c_adapter *adapter;
 
@@ -1437,7 +1482,7 @@ static u8 crc8(u16 data)
 {
 	int i;
 
-	for(i = 0; i < 8; i++) {
+	for (i = 0; i < 8; i++) {
 		if (data & 0x8000)
 			data = data ^ POLY;
 		data = data << 1;
@@ -1450,7 +1495,7 @@ static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count)
 {
 	int i;
 
-	for(i = 0; i < count; i++)
+	for (i = 0; i < count; i++)
 		crc = crc8((crc ^ p[i]) << 8);
 	return crc;
 }
@@ -1520,7 +1565,7 @@ EXPORT_SYMBOL(i2c_smbus_read_byte);
  */
 s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value)
 {
-	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
 	                      I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
 }
 EXPORT_SYMBOL(i2c_smbus_write_byte);
@@ -1558,9 +1603,9 @@ s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value)
 {
 	union i2c_smbus_data data;
 	data.byte = value;
-	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
-	                      I2C_SMBUS_WRITE,command,
-	                      I2C_SMBUS_BYTE_DATA,&data);
+	return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+			      I2C_SMBUS_WRITE, command,
+			      I2C_SMBUS_BYTE_DATA, &data);
 }
 EXPORT_SYMBOL(i2c_smbus_write_byte_data);
 
@@ -1597,9 +1642,9 @@ s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value)
 {
 	union i2c_smbus_data data;
 	data.word = value;
-	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
-	                      I2C_SMBUS_WRITE,command,
-	                      I2C_SMBUS_WORD_DATA,&data);
+	return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+			      I2C_SMBUS_WRITE, command,
+			      I2C_SMBUS_WORD_DATA, &data);
 }
 EXPORT_SYMBOL(i2c_smbus_write_word_data);
 
@@ -1676,9 +1721,9 @@ s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command,
 		length = I2C_SMBUS_BLOCK_MAX;
 	data.block[0] = length;
 	memcpy(&data.block[1], values, length);
-	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
-			      I2C_SMBUS_WRITE,command,
-			      I2C_SMBUS_BLOCK_DATA,&data);
+	return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+			      I2C_SMBUS_WRITE, command,
+			      I2C_SMBUS_BLOCK_DATA, &data);
 }
 EXPORT_SYMBOL(i2c_smbus_write_block_data);
 
@@ -1720,10 +1765,10 @@ EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data);
 
 /* Simulate a SMBus command using the i2c protocol
    No checking of parameters is done!  */
-static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
-                                   unsigned short flags,
-                                   char read_write, u8 command, int size,
-                                   union i2c_smbus_data * data)
+static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr,
+				   unsigned short flags,
+				   char read_write, u8 command, int size,
+				   union i2c_smbus_data *data)
 {
 	/* So we need to generate a series of msgs. In the case of writing, we
 	  need to use only one message; when reading, we need two. We initialize
@@ -1731,7 +1776,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
 	  simpler. */
 	unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX+3];
 	unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX+2];
-	int num = read_write == I2C_SMBUS_READ?2:1;
+	int num = read_write == I2C_SMBUS_READ ? 2 : 1;
 	struct i2c_msg msg[2] = { { addr, flags, 1, msgbuf0 },
 	                          { addr, flags | I2C_M_RD, 0, msgbuf1 }
 	                        };
@@ -1740,7 +1785,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
 	int status;
 
 	msgbuf0[0] = command;
-	switch(size) {
+	switch (size) {
 	case I2C_SMBUS_QUICK:
 		msg[0].len = 0;
 		/* Special case: The read/write field is used as data */
@@ -1767,7 +1812,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
 		if (read_write == I2C_SMBUS_READ)
 			msg[1].len = 2;
 		else {
-			msg[0].len=3;
+			msg[0].len = 3;
 			msgbuf0[1] = data->word & 0xff;
 			msgbuf0[2] = data->word >> 8;
 		}
@@ -1860,26 +1905,26 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
 	}
 
 	if (read_write == I2C_SMBUS_READ)
-		switch(size) {
-			case I2C_SMBUS_BYTE:
-				data->byte = msgbuf0[0];
-				break;
-			case I2C_SMBUS_BYTE_DATA:
-				data->byte = msgbuf1[0];
-				break;
-			case I2C_SMBUS_WORD_DATA:
-			case I2C_SMBUS_PROC_CALL:
-				data->word = msgbuf1[0] | (msgbuf1[1] << 8);
-				break;
-			case I2C_SMBUS_I2C_BLOCK_DATA:
-				for (i = 0; i < data->block[0]; i++)
-					data->block[i+1] = msgbuf1[i];
-				break;
-			case I2C_SMBUS_BLOCK_DATA:
-			case I2C_SMBUS_BLOCK_PROC_CALL:
-				for (i = 0; i < msgbuf1[0] + 1; i++)
-					data->block[i] = msgbuf1[i];
-				break;
+		switch (size) {
+		case I2C_SMBUS_BYTE:
+			data->byte = msgbuf0[0];
+			break;
+		case I2C_SMBUS_BYTE_DATA:
+			data->byte = msgbuf1[0];
+			break;
+		case I2C_SMBUS_WORD_DATA:
+		case I2C_SMBUS_PROC_CALL:
+			data->word = msgbuf1[0] | (msgbuf1[1] << 8);
+			break;
+		case I2C_SMBUS_I2C_BLOCK_DATA:
+			for (i = 0; i < data->block[0]; i++)
+				data->block[i+1] = msgbuf1[i];
+			break;
+		case I2C_SMBUS_BLOCK_DATA:
+		case I2C_SMBUS_BLOCK_PROC_CALL:
+			for (i = 0; i < msgbuf1[0] + 1; i++)
+				data->block[i] = msgbuf1[i];
+			break;
 		}
 	return 0;
 }
@@ -1924,7 +1969,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
 		}
 		rt_mutex_unlock(&adapter->bus_lock);
 	} else
-		res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write,
+		res = i2c_smbus_xfer_emulated(adapter, addr, flags, read_write,
 					      command, protocol, data);
 
 	return res;