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spi doesn't need class_device 

Make the SPI framework and drivers stop using class_device.  Update docs
accordingly ...  highlighting just which sysfs paths should be
"safe"/stable.

Signed-off-by: Tony Jones <tonyj@suse.de>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tony Jones 2007-10-16 01:27:48 -07:00 committed by Linus Torvalds
parent cd58310d77
commit 49dce689ad
12 changed files with 57 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
Documentation/spi/spi-summary
View File

@ -156,21 +156,29 @@ using the driver model to connect controller and protocol drivers using
device tables provided by board specific initialization code. SPI
shows up in sysfs in several locations:
/sys/devices/.../CTLR ... physical node for a given SPI controller
/sys/devices/.../CTLR/spiB.C ... spi_device on bus "B",
chipselect C, accessed through CTLR.
/sys/bus/spi/devices/spiB.C ... symlink to that physical
.../CTLR/spiB.C device
/sys/devices/.../CTLR/spiB.C/modalias ... identifies the driver
that should be used with this device (for hotplug/coldplug)
/sys/bus/spi/devices/spiB.C ... symlink to the physical
spiB.C device
/sys/bus/spi/drivers/D ... driver for one or more spi*.* devices
/sys/class/spi_master/spiB ... class device for the controller
managing bus "B". All the spiB.* devices share the same
/sys/class/spi_master/spiB ... symlink (or actual device node) to
a logical node which could hold class related state for the
controller managing bus "B". All spiB.* devices share one
physical SPI bus segment, with SCLK, MOSI, and MISO.
Note that the actual location of the controller's class state depends
on whether you enabled CONFIG_SYSFS_DEPRECATED or not. At this time,
the only class-specific state is the bus number ("B" in "spiB"), so
those /sys/class entries are only useful to quickly identify busses.
How does board-specific init code declare SPI devices?
------------------------------------------------------
@ -337,7 +345,8 @@ SPI protocol drivers somewhat resemble platform device drivers:
The driver core will autmatically attempt to bind this driver to any SPI
device whose board_info gave a modalias of "CHIP". Your probe() code
might look like this unless you're creating a class_device:
might look like this unless you're creating a device which is managing
a bus (appearing under /sys/class/spi_master).
static int __devinit CHIP_probe(struct spi_device *spi)
{
@ -442,7 +451,7 @@ An SPI controller will probably be registered on the platform_bus; write
a driver to bind to the device, whichever bus is involved.
The main task of this type of driver is to provide an "spi_master".
Use spi_alloc_master() to allocate the master, and class_get_devdata()
Use spi_alloc_master() to allocate the master, and spi_master_get_devdata()
to get the driver-private data allocated for that device.
struct spi_master *master;
@ -452,7 +461,7 @@ to get the driver-private data allocated for that device.
if (!master)
return -ENODEV;
c = class_get_devdata(&master->cdev);
c = spi_master_get_devdata(master);
The driver will initialize the fields of that spi_master, including the
bus number (maybe the same as the platform device ID) and three methods

4
drivers/mmc/host/mmc_spi.c
View File

@ -1280,8 +1280,8 @@ static int mmc_spi_probe(struct spi_device *spi)
if (!host->data)
goto fail_nobuf1;
if (spi->master->cdev.dev->dma_mask) {
struct device *dev = spi->master->cdev.dev;
if (spi->master->dev.parent->dma_mask) {
struct device *dev = spi->master->dev.parent;
host->dma_dev = dev;
host->ones_dma = dma_map_single(dev, ones,

14
drivers/spi/atmel_spi.c
View File

@ -211,7 +211,7 @@ static void atmel_spi_next_message(struct spi_master *master)
msg = list_entry(as->queue.next, struct spi_message, queue);
spi = msg->spi;
dev_dbg(master->cdev.dev, "start message %p for %s\n",
dev_dbg(master->dev.parent, "start message %p for %s\n",
msg, spi->dev.bus_id);
/* select chip if it's not still active */
@ -266,10 +266,10 @@ static void atmel_spi_dma_unmap_xfer(struct spi_master *master,
struct spi_transfer *xfer)
{
if (xfer->tx_dma != INVALID_DMA_ADDRESS)
dma_unmap_single(master->cdev.dev, xfer->tx_dma,
dma_unmap_single(master->dev.parent, xfer->tx_dma,
xfer->len, DMA_TO_DEVICE);
if (xfer->rx_dma != INVALID_DMA_ADDRESS)
dma_unmap_single(master->cdev.dev, xfer->rx_dma,
dma_unmap_single(master->dev.parent, xfer->rx_dma,
xfer->len, DMA_FROM_DEVICE);
}
@ -285,7 +285,7 @@ atmel_spi_msg_done(struct spi_master *master, struct atmel_spi *as,
list_del(&msg->queue);
msg->status = status;
dev_dbg(master->cdev.dev,
dev_dbg(master->dev.parent,
"xfer complete: %u bytes transferred\n",
msg->actual_length);
@ -348,7 +348,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
if (xfer->delay_usecs)
udelay(xfer->delay_usecs);
dev_warn(master->cdev.dev, "fifo overrun (%u/%u remaining)\n",
dev_warn(master->dev.parent, "fifo overrun (%u/%u remaining)\n",
spi_readl(as, TCR), spi_readl(as, RCR));
/*
@ -363,7 +363,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
if (spi_readl(as, SR) & SPI_BIT(TXEMPTY))
break;
if (!timeout)
dev_warn(master->cdev.dev,
dev_warn(master->dev.parent,
"timeout waiting for TXEMPTY");
while (spi_readl(as, SR) & SPI_BIT(RDRF))
spi_readl(as, RDR);
@ -526,7 +526,7 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
struct atmel_spi *as;
struct spi_transfer *xfer;
unsigned long flags;
struct device *controller = spi->master->cdev.dev;
struct device *controller = spi->master->dev.parent;
as = spi_master_get_devdata(spi->master);

2
drivers/spi/mpc52xx_psc_spi.c
View File

@ -503,7 +503,7 @@ static int __init mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
INIT_LIST_HEAD(&mps->queue);
mps->workqueue = create_singlethread_workqueue(
master->cdev.dev->bus_id);
master->dev.parent->bus_id);
if (mps->workqueue == NULL) {
ret = -EBUSY;
goto free_irq;

2
drivers/spi/pxa2xx_spi.c
View File

@ -1242,7 +1242,7 @@ static int __init init_queue(struct driver_data *drv_data)
INIT_WORK(&drv_data->pump_messages, pump_messages);
drv_data->workqueue = create_singlethread_workqueue(
drv_data->master->cdev.dev->bus_id);
drv_data->master->dev.parent->bus_id);
if (drv_data->workqueue == NULL)
return -EBUSY;

36
drivers/spi/spi.c
View File

@ -204,7 +204,7 @@ struct spi_device *spi_new_device(struct spi_master *master,
struct spi_board_info *chip)
{
struct spi_device *proxy;
struct device *dev = master->cdev.dev;
struct device *dev = master->dev.parent;
int status;
/* NOTE: caller did any chip->bus_num checks necessary.
@ -239,7 +239,7 @@ struct spi_device *spi_new_device(struct spi_master *master,
proxy->modalias = chip->modalias;
snprintf(proxy->dev.bus_id, sizeof proxy->dev.bus_id,
"%s.%u", master->cdev.class_id,
"%s.%u", master->dev.bus_id,
chip->chip_select);
proxy->dev.parent = dev;
proxy->dev.bus = &spi_bus_type;
@ -338,18 +338,18 @@ static void scan_boardinfo(struct spi_master *master)
/*-------------------------------------------------------------------------*/
static void spi_master_release(struct class_device *cdev)
static void spi_master_release(struct device *dev)
{
struct spi_master *master;
master = container_of(cdev, struct spi_master, cdev);
master = container_of(dev, struct spi_master, dev);
kfree(master);
}
static struct class spi_master_class = {
.name = "spi_master",
.owner = THIS_MODULE,
.release = spi_master_release,
.dev_release = spi_master_release,
};
@ -357,7 +357,7 @@ static struct class spi_master_class = {
* spi_alloc_master - allocate SPI master controller
* @dev: the controller, possibly using the platform_bus
* @size: how much zeroed driver-private data to allocate; the pointer to this
* memory is in the class_data field of the returned class_device,
* memory is in the driver_data field of the returned device,
* accessible with spi_master_get_devdata().
* Context: can sleep
*
@ -383,9 +383,9 @@ struct spi_master *spi_alloc_master(struct device *dev, unsigned size)
if (!master)
return NULL;
class_device_initialize(&master->cdev);
master->cdev.class = &spi_master_class;
master->cdev.dev = get_device(dev);
device_initialize(&master->dev);
master->dev.class = &spi_master_class;
master->dev.parent = get_device(dev);
spi_master_set_devdata(master, &master[1]);
return master;
@ -415,7 +415,7 @@ EXPORT_SYMBOL_GPL(spi_alloc_master);
int spi_register_master(struct spi_master *master)
{
static atomic_t dyn_bus_id = ATOMIC_INIT((1<<15) - 1);
struct device *dev = master->cdev.dev;
struct device *dev = master->dev.parent;
int status = -ENODEV;
int dynamic = 0;
@ -440,12 +440,12 @@ int spi_register_master(struct spi_master *master)
/* register the device, then userspace will see it.
* registration fails if the bus ID is in use.
*/
snprintf(master->cdev.class_id, sizeof master->cdev.class_id,
snprintf(master->dev.bus_id, sizeof master->dev.bus_id,
"spi%u", master->bus_num);
status = class_device_add(&master->cdev);
status = device_add(&master->dev);
if (status < 0)
goto done;
dev_dbg(dev, "registered master %s%s\n", master->cdev.class_id,
dev_dbg(dev, "registered master %s%s\n", master->dev.bus_id,
dynamic ? " (dynamic)" : "");
/* populate children from any spi device tables */
@ -478,8 +478,8 @@ void spi_unregister_master(struct spi_master *master)
{
int dummy;
dummy = device_for_each_child(master->cdev.dev, NULL, __unregister);
class_device_unregister(&master->cdev);
dummy = device_for_each_child(master->dev.parent, NULL, __unregister);
device_unregister(&master->dev);
}
EXPORT_SYMBOL_GPL(spi_unregister_master);
@ -495,13 +495,13 @@ EXPORT_SYMBOL_GPL(spi_unregister_master);
*/
struct spi_master *spi_busnum_to_master(u16 bus_num)
{
struct class_device *cdev;
struct device *dev;
struct spi_master *master = NULL;
struct spi_master *m;
down(&spi_master_class.sem);
list_for_each_entry(cdev, &spi_master_class.children, node) {
m = container_of(cdev, struct spi_master, cdev);
list_for_each_entry(dev, &spi_master_class.children, node) {
m = container_of(dev, struct spi_master, dev);
if (m->bus_num == bus_num) {
master = spi_master_get(m);
break;

2
drivers/spi/spi_bfin5xx.c
View File

@ -1106,7 +1106,7 @@ static inline int init_queue(struct driver_data *drv_data)
/* init messages workqueue */
INIT_WORK(&drv_data->pump_messages, pump_messages);
drv_data->workqueue =
create_singlethread_workqueue(drv_data->master->cdev.dev->bus_id);
create_singlethread_workqueue(drv_data->master->dev.parent->bus_id);
if (drv_data->workqueue == NULL)
return -EBUSY;

2
drivers/spi/spi_bitbang.c
View File

@ -472,7 +472,7 @@ int spi_bitbang_start(struct spi_bitbang *bitbang)
/* this task is the only thing to touch the SPI bits */
bitbang->busy = 0;
bitbang->workqueue = create_singlethread_workqueue(
bitbang->master->cdev.dev->bus_id);
bitbang->master->dev.parent->bus_id);
if (bitbang->workqueue == NULL) {
status = -EBUSY;
goto err1;

2
drivers/spi/spi_imx.c
View File

@ -1374,7 +1374,7 @@ static int __init init_queue(struct driver_data *drv_data)
INIT_WORK(&drv_data->work, pump_messages);
drv_data->workqueue = create_singlethread_workqueue(
drv_data->master->cdev.dev->bus_id);
drv_data->master->dev.parent->bus_id);
if (drv_data->workqueue == NULL)
return -EBUSY;

2
drivers/spi/spi_lm70llp.c
View File

@ -82,7 +82,7 @@ struct spi_lm70llp {
struct pardevice *pd;
struct spi_device *spidev_lm70;
struct spi_board_info info;
struct class_device *cdev;
//struct device *dev;
};
/* REVISIT : ugly global ; provides "exclusive open" facility */

2
drivers/spi/spi_txx9.c
View File

@ -400,7 +400,7 @@ static int __init txx9spi_probe(struct platform_device *dev)
goto exit;
}
c->workqueue = create_singlethread_workqueue(master->cdev.dev->bus_id);
c->workqueue = create_singlethread_workqueue(master->dev.parent->bus_id);
if (!c->workqueue)
goto exit;
c->last_chipselect = -1;

12
include/linux/spi/spi.h
View File

@ -195,7 +195,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
/**
* struct spi_master - interface to SPI master controller
* @cdev: class interface to this driver
* @dev: device interface to this driver
* @bus_num: board-specific (and often SOC-specific) identifier for a
* given SPI controller.
* @num_chipselect: chipselects are used to distinguish individual
@ -222,7 +222,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* message's completion function when the transaction completes.
*/
struct spi_master {
struct class_device cdev;
struct device dev;
/* other than negative (== assign one dynamically), bus_num is fully
* board-specific. usually that simplifies to being SOC-specific.
@ -268,17 +268,17 @@ struct spi_master {
static inline void *spi_master_get_devdata(struct spi_master *master)
{
return class_get_devdata(&master->cdev);
return dev_get_drvdata(&master->dev);
}
static inline void spi_master_set_devdata(struct spi_master *master, void *data)
{
class_set_devdata(&master->cdev, data);
dev_set_drvdata(&master->dev, data);
}
static inline struct spi_master *spi_master_get(struct spi_master *master)
{
if (!master || !class_device_get(&master->cdev))
if (!master || !get_device(&master->dev))
return NULL;
return master;
}
@ -286,7 +286,7 @@ static inline struct spi_master *spi_master_get(struct spi_master *master)
static inline void spi_master_put(struct spi_master *master)
{
if (master)
class_device_put(&master->cdev);
put_device(&master->dev);
}