spi: enable spi_board_info to be registered after spi_master

Currently spi_register_board_info() has to be called before its related
spi_master be registered, otherwise these board info will be just ignored.

This patch will remove this order limit, it adds a global spi master list
like the existing global board info listr. Whenever a board info or a
spi_master is registered, the spi master list or board info list
will be scanned, and a new spi device will be created if there is a
master-board info match.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b5a78a1..0845cd4 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -29,11 +29,6 @@
 #include <linux/spi/spi.h>
 #include <linux/of_spi.h>
 
-
-/* SPI bustype and spi_master class are registered after board init code
- * provides the SPI device tables, ensuring that both are present by the
- * time controller driver registration causes spi_devices to "enumerate".
- */
 static void spidev_release(struct device *dev)
 {
        struct spi_device       *spi = to_spi_device(dev);
@@ -202,11 +197,16 @@ EXPORT_SYMBOL_GPL(spi_register_driver);
 
 struct boardinfo {
        struct list_head        list;
-       unsigned                n_board_info;
-       struct spi_board_info   board_info[0];
+       struct spi_board_info   board_info;
 };
 
 static LIST_HEAD(board_list);
+static LIST_HEAD(spi_master_list);
+
+/*
+ * Used to protect add/del opertion for board_info list and
+ * spi_master list, and their matching process
+ */
 static DEFINE_MUTEX(board_lock);
 
 /**
@@ -371,6 +371,20 @@ struct spi_device *spi_new_device(struct spi_master *master,
 }
 EXPORT_SYMBOL_GPL(spi_new_device);
 
+static void spi_match_master_to_boardinfo(struct spi_master *master,
+                               struct spi_board_info *bi)
+{
+       struct spi_device *dev;
+
+       if (master->bus_num != bi->bus_num)
+               return;
+
+       dev = spi_new_device(master, bi);
+       if (!dev)
+               dev_err(master->dev.parent, "can't create new device for %s\n",
+                       bi->modalias);
+}
+
 /**
  * spi_register_board_info - register SPI devices for a given board
  * @info: array of chip descriptors
@@ -393,43 +407,25 @@ EXPORT_SYMBOL_GPL(spi_new_device);
 int __init
 spi_register_board_info(struct spi_board_info const *info, unsigned n)
 {
-       struct boardinfo        *bi;
+       struct boardinfo *bi;
+       int i;
 
-       bi = kmalloc(sizeof(*bi) + n * sizeof *info, GFP_KERNEL);
+       bi = kzalloc(n * sizeof(*bi), GFP_KERNEL);
        if (!bi)
                return -ENOMEM;
-       bi->n_board_info = n;
-       memcpy(bi->board_info, info, n * sizeof *info);
 
-       mutex_lock(&board_lock);
-       list_add_tail(&bi->list, &board_list);
-       mutex_unlock(&board_lock);
-       return 0;
-}
+       for (i = 0; i < n; i++, bi++, info++) {
+               struct spi_master *master;
 
-/* FIXME someone should add support for a __setup("spi", ...) that
- * creates board info from kernel command lines
- */
-
-static void scan_boardinfo(struct spi_master *master)
-{
-       struct boardinfo        *bi;
-
-       mutex_lock(&board_lock);
-       list_for_each_entry(bi, &board_list, list) {
-               struct spi_board_info   *chip = bi->board_info;
-               unsigned                n;
-
-               for (n = bi->n_board_info; n > 0; n--, chip++) {
-                       if (chip->bus_num != master->bus_num)
-                               continue;
-                       /* NOTE: this relies on spi_new_device to
-                        * issue diagnostics when given bogus inputs
-                        */
-                       (void) spi_new_device(master, chip);
-               }
+               memcpy(&bi->board_info, info, sizeof(*info));
+               mutex_lock(&board_lock);
+               list_add_tail(&bi->list, &board_list);
+               list_for_each_entry(master, &spi_master_list, list)
+                       spi_match_master_to_boardinfo(master, &bi->board_info);
+               mutex_unlock(&board_lock);
        }
-       mutex_unlock(&board_lock);
+
+       return 0;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -512,6 +508,7 @@ int spi_register_master(struct spi_master *master)
 {
        static atomic_t         dyn_bus_id = ATOMIC_INIT((1<<15) - 1);
        struct device           *dev = master->dev.parent;
+       struct boardinfo        *bi;
        int                     status = -ENODEV;
        int                     dynamic = 0;
 
@@ -547,8 +544,12 @@ int spi_register_master(struct spi_master *master)
        dev_dbg(dev, "registered master %s%s\n", dev_name(&master->dev),
                        dynamic ? " (dynamic)" : "");
 
-       /* populate children from any spi device tables */
-       scan_boardinfo(master);
+       mutex_lock(&board_lock);
+       list_add_tail(&master->list, &spi_master_list);
+       list_for_each_entry(bi, &board_list, list)
+               spi_match_master_to_boardinfo(master, &bi->board_info);
+       mutex_unlock(&board_lock);
+
        status = 0;
 
        /* Register devices from the device tree */
@@ -579,7 +580,12 @@ void spi_unregister_master(struct spi_master *master)
 {
        int dummy;
 
-       dummy = device_for_each_child(&master->dev, NULL, __unregister);
+       mutex_lock(&board_lock);
+       list_del(&master->list);
+       mutex_unlock(&board_lock);
+
+       dummy = device_for_each_child(master->dev.parent, &master->dev,
+                                       __unregister);
        device_unregister(&master->dev);
 }
 EXPORT_SYMBOL_GPL(spi_unregister_master);

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 92e52a1..b4d7710 100644 (file)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -204,6 +204,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
 /**
  * struct spi_master - interface to SPI master controller
  * @dev: device interface to this driver
+ * @list: link with the global spi_master list
  * @bus_num: board-specific (and often SOC-specific) identifier for a
  *     given SPI controller.
  * @num_chipselect: chipselects are used to distinguish individual
@@ -238,6 +239,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
 struct spi_master {
        struct device   dev;
 
+       struct list_head list;
+
        /* other than negative (== assign one dynamically), bus_num is fully
         * board-specific.  usually that simplifies to being SOC-specific.
         * example:  one SOC has three SPI controllers, numbered 0..2,