diff options
Diffstat (limited to 'drivers/i2c/i2c-core.c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 10be7b5fbe9..3202a86f420 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -34,6 +34,7 @@ #include <linux/hardirq.h> #include <linux/irqflags.h> #include <linux/rwsem.h> +#include <linux/pm_runtime.h> #include <asm/uaccess.h> #include "i2c-core.h" @@ -184,6 +185,52 @@ static int i2c_device_pm_resume(struct device *dev) #define i2c_device_pm_resume NULL #endif +#ifdef CONFIG_PM_RUNTIME +static int i2c_device_runtime_suspend(struct device *dev) +{ + const struct dev_pm_ops *pm; + + if (!dev->driver) + return 0; + pm = dev->driver->pm; + if (!pm || !pm->runtime_suspend) + return 0; + return pm->runtime_suspend(dev); +} + +static int i2c_device_runtime_resume(struct device *dev) +{ + const struct dev_pm_ops *pm; + + if (!dev->driver) + return 0; + pm = dev->driver->pm; + if (!pm || !pm->runtime_resume) + return 0; + return pm->runtime_resume(dev); +} + +static int i2c_device_runtime_idle(struct device *dev) +{ + const struct dev_pm_ops *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; + } + + return pm_runtime_suspend(dev); +} +#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) { struct i2c_client *client = i2c_verify_client(dev); @@ -251,6 +298,9 @@ 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, }; struct bus_type i2c_bus_type = { @@ -1133,7 +1183,7 @@ EXPORT_SYMBOL(i2c_transfer); * i2c_master_send - issue a single I2C message in master transmit mode * @client: Handle to slave device * @buf: Data that will be written to the slave - * @count: How many bytes to write + * @count: How many bytes to write, must be less than 64k since msg.len is u16 * * Returns negative errno, or else the number of bytes written. */ @@ -1160,7 +1210,7 @@ EXPORT_SYMBOL(i2c_master_send); * i2c_master_recv - issue a single I2C message in master receive mode * @client: Handle to slave device * @buf: Where to store data read from slave - * @count: How many bytes to read + * @count: How many bytes to read, must be less than 64k since msg.len is u16 * * Returns negative errno, or else the number of bytes read. */ |