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>

12 files changed, 57 insertions, 48 deletions

diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary
index 76ea6c837be5..8861e47e5a2d 100644
--- a/Documentation/spi/spi-summary
+++ b/Documentation/spi/spi-summary
@@ -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
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 254b194e7625..71b986b38c55 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -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,
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index b0469749310a..0d342dcdd302 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -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);
 
diff --git a/drivers/spi/mpc52xx_psc_spi.c b/drivers/spi/mpc52xx_psc_spi.c
index d2a4b2bdb07b..e9aba932f217 100644
--- a/drivers/spi/mpc52xx_psc_spi.c
+++ b/drivers/spi/mpc52xx_psc_spi.c
@@ -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;
diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index e05918e79eae..5f3d808cbc29 100644
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -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;
 
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index bcb8dd5fb0b4..89769ce16f88 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -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;
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 179f9b8dc715..6cb71d74738f 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -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;
 
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index 0c85c984ccb4..81639c6be1c7 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -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;
diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c
index 0f0c5c11c79f..3b4650ae6f1a 100644
--- a/drivers/spi/spi_imx.c
+++ b/drivers/spi/spi_imx.c
@@ -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;
 
diff --git a/drivers/spi/spi_lm70llp.c b/drivers/spi/spi_lm70llp.c
index 4ea68ac16115..39d8d8ad65c0 100644
--- a/drivers/spi/spi_lm70llp.c
+++ b/drivers/spi/spi_lm70llp.c
@@ -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 */
diff --git a/drivers/spi/spi_txx9.c b/drivers/spi/spi_txx9.c
index b7f4bb239eaf..cc5094f37dd3 100644
--- a/drivers/spi/spi_txx9.c
+++ b/drivers/spi/spi_txx9.c
@@ -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;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 002a3cddbdd5..387e428f1cdf 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -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);
 }