lkml.org 
[lkml]   [2011]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] staging: vme: add struct vme_dev for VME devices
Date
Instead of using a vanilla 'struct device' for VME devices, add new
'struct vme_dev'. Modifications have been made to the VME framework
API as well as all in-tree VME drivers.

The new vme_dev structure has the following advantages from the
current model used by the driver:

* Driver functions (probe, remove) now receive a VME device
instead of a pointer to the bridge device (cleaner design)
* It's easier to differenciate API calls as bridge-based or
device-based (ie. cleaner interface).

Signed-off-by: Manohar Vanga <manohar.vanga@cern.ch>
---
drivers/staging/vme/devices/vme_user.c | 14 ++--
drivers/staging/vme/vme.c | 128 +++++++++++++-------------------
drivers/staging/vme/vme.h | 37 +++++++---
drivers/staging/vme/vme_api.txt | 41 ++++++++---
drivers/staging/vme/vme_bridge.h | 5 +-
5 files changed, 117 insertions(+), 108 deletions(-)
diff --git a/drivers/staging/vme/devices/vme_user.c b/drivers/staging/vme/devices/vme_user.c
index 3cbeb2a..bb33dc2 100644
--- a/drivers/staging/vme/devices/vme_user.c
+++ b/drivers/staging/vme/devices/vme_user.c
@@ -116,7 +116,7 @@ static struct driver_stats statistics;

static struct cdev *vme_user_cdev; /* Character device */
static struct class *vme_user_sysfs_class; /* Sysfs class */
-static struct device *vme_user_bridge; /* Pointer to bridge device */
+static struct vme_dev *vme_user_bridge; /* Pointer to user device */


static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR,
@@ -135,8 +135,8 @@ static ssize_t vme_user_write(struct file *, const char __user *, size_t,
static loff_t vme_user_llseek(struct file *, loff_t, int);
static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long);

-static int __devinit vme_user_probe(struct device *, int, int);
-static int __devexit vme_user_remove(struct device *, int, int);
+static int __devinit vme_user_probe(struct vme_dev *);
+static int __devexit vme_user_remove(struct vme_dev *);

static const struct file_operations vme_user_fops = {
.open = vme_user_open,
@@ -689,8 +689,7 @@ err_nocard:
* as practical. We will therefore reserve the buffers and request the images
* here so that we don't have to do it later.
*/
-static int __devinit vme_user_probe(struct device *dev, int cur_bus,
- int cur_slot)
+static int __devinit vme_user_probe(struct vme_dev *vdev)
{
int i, err;
char name[12];
@@ -702,7 +701,7 @@ static int __devinit vme_user_probe(struct device *dev, int cur_bus,
err = -EINVAL;
goto err_dev;
}
- vme_user_bridge = dev;
+ vme_user_bridge = vdev;

/* Initialise descriptors */
for (i = 0; i < VME_DEVS; i++) {
@@ -865,8 +864,7 @@ err_dev:
return err;
}

-static int __devexit vme_user_remove(struct device *dev, int cur_bus,
- int cur_slot)
+static int __devexit vme_user_remove(struct vme_dev *dev)
{
int i;

diff --git a/drivers/staging/vme/vme.c b/drivers/staging/vme/vme.c
index 810fe1f..76e08f3 100644
--- a/drivers/staging/vme/vme.c
+++ b/drivers/staging/vme/vme.c
@@ -42,13 +42,9 @@ static DEFINE_MUTEX(vme_buses_lock);
static void __exit vme_exit(void);
static int __init vme_init(void);

-
-/*
- * Find the bridge resource associated with a specific device resource
- */
-static struct vme_bridge *dev_to_bridge(struct device *dev)
+static struct vme_dev *dev_to_vme_dev(struct device *dev)
{
- return dev->platform_data;
+ return container_of(dev, struct vme_dev, dev);
}

/*
@@ -236,7 +232,7 @@ static int vme_check_window(vme_address_t aspace, unsigned long long vme_base,
* Request a slave image with specific attributes, return some unique
* identifier.
*/
-struct vme_resource *vme_slave_request(struct device *dev,
+struct vme_resource *vme_slave_request(struct vme_dev *vdev,
vme_address_t address, vme_cycle_t cycle)
{
struct vme_bridge *bridge;
@@ -245,7 +241,7 @@ struct vme_resource *vme_slave_request(struct device *dev,
struct vme_slave_resource *slave_image = NULL;
struct vme_resource *resource = NULL;

- bridge = dev_to_bridge(dev);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
@@ -392,7 +388,7 @@ EXPORT_SYMBOL(vme_slave_free);
* Request a master image with specific attributes, return some unique
* identifier.
*/
-struct vme_resource *vme_master_request(struct device *dev,
+struct vme_resource *vme_master_request(struct vme_dev *vdev,
vme_address_t address, vme_cycle_t cycle, vme_width_t dwidth)
{
struct vme_bridge *bridge;
@@ -401,7 +397,7 @@ struct vme_resource *vme_master_request(struct device *dev,
struct vme_master_resource *master_image = NULL;
struct vme_resource *resource = NULL;

- bridge = dev_to_bridge(dev);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
@@ -650,7 +646,8 @@ EXPORT_SYMBOL(vme_master_free);
* Request a DMA controller with specific attributes, return some unique
* identifier.
*/
-struct vme_resource *vme_dma_request(struct device *dev, vme_dma_route_t route)
+struct vme_resource *vme_dma_request(struct vme_dev *vdev,
+ vme_dma_route_t route)
{
struct vme_bridge *bridge;
struct list_head *dma_pos = NULL;
@@ -661,7 +658,7 @@ struct vme_resource *vme_dma_request(struct device *dev, vme_dma_route_t route)
/* XXX Not checking resource attributes */
printk(KERN_ERR "No VME resource Attribute tests done\n");

- bridge = dev_to_bridge(dev);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
@@ -994,13 +991,13 @@ void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
}
EXPORT_SYMBOL(vme_irq_handler);

-int vme_irq_request(struct device *dev, int level, int statid,
+int vme_irq_request(struct vme_dev *vdev, int level, int statid,
void (*callback)(int, int, void *),
void *priv_data)
{
struct vme_bridge *bridge;

- bridge = dev_to_bridge(dev);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
@@ -1037,11 +1034,11 @@ int vme_irq_request(struct device *dev, int level, int statid,
}
EXPORT_SYMBOL(vme_irq_request);

-void vme_irq_free(struct device *dev, int level, int statid)
+void vme_irq_free(struct vme_dev *vdev, int level, int statid)
{
struct vme_bridge *bridge;

- bridge = dev_to_bridge(dev);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
return;
@@ -1072,11 +1069,11 @@ void vme_irq_free(struct device *dev, int level, int statid)
}
EXPORT_SYMBOL(vme_irq_free);

-int vme_irq_generate(struct device *dev, int level, int statid)
+int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
{
struct vme_bridge *bridge;

- bridge = dev_to_bridge(dev);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
@@ -1099,7 +1096,7 @@ EXPORT_SYMBOL(vme_irq_generate);
/*
* Request the location monitor, return resource or NULL
*/
-struct vme_resource *vme_lm_request(struct device *dev)
+struct vme_resource *vme_lm_request(struct vme_dev *vdev)
{
struct vme_bridge *bridge;
struct list_head *lm_pos = NULL;
@@ -1107,7 +1104,7 @@ struct vme_resource *vme_lm_request(struct device *dev)
struct vme_lm_resource *lm = NULL;
struct vme_resource *resource = NULL;

- bridge = dev_to_bridge(dev);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
@@ -1288,11 +1285,11 @@ void vme_lm_free(struct vme_resource *resource)
}
EXPORT_SYMBOL(vme_lm_free);

-int vme_slot_get(struct device *bus)
+int vme_slot_get(struct vme_dev *vdev)
{
struct vme_bridge *bridge;

- bridge = dev_to_bridge(bus);
+ bridge = vdev->bridge;
if (bridge == NULL) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
@@ -1340,12 +1337,12 @@ static void vme_remove_bus(struct vme_bridge *bridge)

static void vme_dev_release(struct device *dev)
{
- kfree(dev);
+ kfree(dev_to_vme_dev(dev));
}

int vme_register_bridge(struct vme_bridge *bridge)
{
- struct device *dev;
+ struct vme_dev *vdev;
int retval;
int i;

@@ -1358,26 +1355,29 @@ int vme_register_bridge(struct vme_bridge *bridge)
* specification.
*/
for (i = 0; i < VME_SLOTS_MAX; i++) {
- bridge->dev[i] = kzalloc(sizeof(struct device), GFP_KERNEL);
+ bridge->dev[i] = kzalloc(sizeof(struct vme_dev), GFP_KERNEL);
if (!bridge->dev[i]) {
retval = -ENOMEM;
goto err_devalloc;
}
- dev = bridge->dev[i];
- memset(dev, 0, sizeof(struct device));
-
- dev->parent = bridge->parent;
- dev->bus = &vme_bus_type;
- dev->release = vme_dev_release;
+ vdev = bridge->dev[i];
+ memset(vdev, 0, sizeof(struct vme_dev));
+
+ vdev->id.bus = bridge->num;
+ vdev->id.slot = i + 1;
+ vdev->bridge = bridge;
+ vdev->dev.parent = bridge->parent;
+ vdev->dev.bus = &vme_bus_type;
+ vdev->dev.release = vme_dev_release;
/*
* We save a pointer to the bridge in platform_data so that we
* can get to it later. We keep driver_data for use by the
* driver that binds against the slot
*/
- dev->platform_data = bridge;
- dev_set_name(dev, "vme-%x.%x", bridge->num, i + 1);
+ vdev->dev.platform_data = bridge;
+ dev_set_name(&vdev->dev, "vme-%x.%x", bridge->num, i + 1);

- retval = device_register(dev);
+ retval = device_register(&vdev->dev);
if (retval)
goto err_reg;
}
@@ -1385,11 +1385,11 @@ int vme_register_bridge(struct vme_bridge *bridge)
return retval;

err_reg:
- kfree(dev);
+ kfree(vdev);
err_devalloc:
while (--i >= 0) {
- dev = bridge->dev[i];
- device_unregister(dev);
+ vdev = bridge->dev[i];
+ device_unregister(&vdev->dev);
}
vme_remove_bus(bridge);
return retval;
@@ -1399,12 +1399,12 @@ EXPORT_SYMBOL(vme_register_bridge);
void vme_unregister_bridge(struct vme_bridge *bridge)
{
int i;
- struct device *dev;
+ struct vme_dev *vdev;


for (i = 0; i < VME_SLOTS_MAX; i++) {
- dev = bridge->dev[i];
- device_unregister(dev);
+ vdev = bridge->dev[i];
+ device_unregister(&vdev->dev);
}
vme_remove_bus(bridge);
}
@@ -1430,32 +1430,6 @@ EXPORT_SYMBOL(vme_unregister_driver);

/* - Bus Registration ------------------------------------------------------ */

-static int vme_calc_slot(struct device *dev)
-{
- struct vme_bridge *bridge;
- int num;
-
- bridge = dev_to_bridge(dev);
-
- /* Determine slot number */
- num = 0;
- while (num < VME_SLOTS_MAX) {
- if (bridge->dev[num] == dev)
- break;
-
- num++;
- }
- if (num == VME_SLOTS_MAX) {
- dev_err(dev, "Failed to identify slot\n");
- num = 0;
- goto err_dev;
- }
- num++;
-
-err_dev:
- return num;
-}
-
static struct vme_driver *dev_to_vme_driver(struct device *dev)
{
if (dev->driver == NULL)
@@ -1466,15 +1440,17 @@ static struct vme_driver *dev_to_vme_driver(struct device *dev)

static int vme_bus_match(struct device *dev, struct device_driver *drv)
{
+ struct vme_dev *vdev;
struct vme_bridge *bridge;
struct vme_driver *driver;
int i, num;

- bridge = dev_to_bridge(dev);
+ vdev = dev_to_vme_dev(dev);
+ bridge = vdev->bridge;
driver = container_of(drv, struct vme_driver, driver);

- num = vme_calc_slot(dev);
- if (!num)
+ num = vdev->id.slot;
+ if (num <= 0 || num >= VME_SLOTS_MAX)
goto err_dev;

if (driver->bind_table == NULL) {
@@ -1494,7 +1470,7 @@ static int vme_bus_match(struct device *dev, struct device_driver *drv)
return 1;

if ((driver->bind_table[i].slot == VME_SLOT_CURRENT) &&
- (num == vme_slot_get(dev)))
+ (num == vme_slot_get(vdev)))
return 1;
}
i++;
@@ -1507,30 +1483,30 @@ err_table:

static int vme_bus_probe(struct device *dev)
{
- struct vme_bridge *bridge;
struct vme_driver *driver;
+ struct vme_dev *vdev;
int retval = -ENODEV;

driver = dev_to_vme_driver(dev);
- bridge = dev_to_bridge(dev);
+ vdev = dev_to_vme_dev(dev);

if (driver->probe != NULL)
- retval = driver->probe(dev, bridge->num, vme_calc_slot(dev));
+ retval = driver->probe(vdev);

return retval;
}

static int vme_bus_remove(struct device *dev)
{
- struct vme_bridge *bridge;
struct vme_driver *driver;
+ struct vme_dev *vdev;
int retval = -ENODEV;

driver = dev_to_vme_driver(dev);
- bridge = dev_to_bridge(dev);
+ vdev = dev_to_vme_dev(dev);

if (driver->remove != NULL)
- retval = driver->remove(dev, bridge->num, vme_calc_slot(dev));
+ retval = driver->remove(vdev);

return retval;
}
diff --git a/drivers/staging/vme/vme.h b/drivers/staging/vme/vme.h
index 4155d8c..d442cce 100644
--- a/drivers/staging/vme/vme.h
+++ b/drivers/staging/vme/vme.h
@@ -91,17 +91,34 @@ extern struct bus_type vme_bus_type;
#define VME_SLOT_CURRENT -1
#define VME_SLOT_ALL -2

+/**
+ * VME device identifier structure
+ * @bus: The bus ID of the bus the device is on
+ * @slot: The slot this device is plugged into
+ */
struct vme_device_id {
int bus;
int slot;
};

+/**
+ * Structure representing a VME device
+ * @id: The ID of the device (currently the bus and slot number)
+ * @bridge: Pointer to the bridge device this device is on
+ * @dev: Internal device structure
+ */
+struct vme_dev {
+ struct vme_device_id id;
+ struct vme_bridge *bridge;
+ struct device dev;
+};
+
struct vme_driver {
struct list_head node;
const char *name;
const struct vme_device_id *bind_table;
- int (*probe) (struct device *, int, int);
- int (*remove) (struct device *, int, int);
+ int (*probe) (struct vme_dev *);
+ int (*remove) (struct vme_dev *);
void (*shutdown) (void);
struct device_driver driver;
};
@@ -112,7 +129,7 @@ void vme_free_consistent(struct vme_resource *, size_t, void *,

size_t vme_get_size(struct vme_resource *);

-struct vme_resource *vme_slave_request(struct device *, vme_address_t,
+struct vme_resource *vme_slave_request(struct vme_dev *, vme_address_t,
vme_cycle_t);
int vme_slave_set(struct vme_resource *, int, unsigned long long,
unsigned long long, dma_addr_t, vme_address_t, vme_cycle_t);
@@ -120,7 +137,7 @@ int vme_slave_get(struct vme_resource *, int *, unsigned long long *,
unsigned long long *, dma_addr_t *, vme_address_t *, vme_cycle_t *);
void vme_slave_free(struct vme_resource *);

-struct vme_resource *vme_master_request(struct device *, vme_address_t,
+struct vme_resource *vme_master_request(struct vme_dev *, vme_address_t,
vme_cycle_t, vme_width_t);
int vme_master_set(struct vme_resource *, int, unsigned long long,
unsigned long long, vme_address_t, vme_cycle_t, vme_width_t);
@@ -132,7 +149,7 @@ unsigned int vme_master_rmw(struct vme_resource *, unsigned int, unsigned int,
unsigned int, loff_t);
void vme_master_free(struct vme_resource *);

-struct vme_resource *vme_dma_request(struct device *, vme_dma_route_t);
+struct vme_resource *vme_dma_request(struct vme_dev *, vme_dma_route_t);
struct vme_dma_list *vme_new_dma_list(struct vme_resource *);
struct vme_dma_attr *vme_dma_pattern_attribute(u32, vme_pattern_t);
struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t);
@@ -145,12 +162,12 @@ int vme_dma_list_exec(struct vme_dma_list *);
int vme_dma_list_free(struct vme_dma_list *);
int vme_dma_free(struct vme_resource *);

-int vme_irq_request(struct device *, int, int,
+int vme_irq_request(struct vme_dev *, int, int,
void (*callback)(int, int, void *), void *);
-void vme_irq_free(struct device *, int, int);
-int vme_irq_generate(struct device *, int, int);
+void vme_irq_free(struct vme_dev *, int, int);
+int vme_irq_generate(struct vme_dev *, int, int);

-struct vme_resource * vme_lm_request(struct device *);
+struct vme_resource * vme_lm_request(struct vme_dev *);
int vme_lm_count(struct vme_resource *);
int vme_lm_set(struct vme_resource *, unsigned long long, vme_address_t,
vme_cycle_t);
@@ -160,7 +177,7 @@ int vme_lm_attach(struct vme_resource *, int, void (*callback)(int));
int vme_lm_detach(struct vme_resource *, int);
void vme_lm_free(struct vme_resource *);

-int vme_slot_get(struct device *);
+int vme_slot_get(struct vme_dev *);

int vme_register_driver(struct vme_driver *);
void vme_unregister_driver(struct vme_driver *);
diff --git a/drivers/staging/vme/vme_api.txt b/drivers/staging/vme/vme_api.txt
index 4910e92..03f4813 100644
--- a/drivers/staging/vme/vme_api.txt
+++ b/drivers/staging/vme/vme_api.txt
@@ -20,8 +20,8 @@ registration function. The structure is as follows:
struct list_head node;
char *name;
const struct vme_device_id *bind_table;
- int (*probe) (struct device *, int, int);
- int (*remove) (struct device *, int, int);
+ int (*probe) (struct vme_dev *);
+ int (*remove) (struct vme_dev *);
void (*shutdown) (void);
struct device_driver driver;
};
@@ -33,7 +33,26 @@ to the probe routine.

The arguments of the probe routine are as follows:

- probe(struct device *dev, int bus, int slot);
+ probe(struct vme_dev *dev);
+
+The device structure looks like the following:
+
+ struct vme_dev {
+ struct vme_device_id id;
+ struct vme_bridge *bridge;
+ struct device dev;
+ };
+
+The 'bridge' field contains a pointer to the bridge device. The 'id' field
+contains information useful for the probe function:
+
+ struct vme_device_id {
+ int bus;
+ int slot;
+ };
+
+'bus' is the number of the bus the device being probed is on. 'slot' refers
+to the specific slot on the VME bus.

The '.bind_table' is a pointer to an array of type 'vme_device_id':

@@ -71,13 +90,13 @@ specific window or DMA channel (which may be used by a different driver) this
driver allows a resource to be assigned based on the required attributes of the
driver in question:

- struct vme_resource * vme_master_request(struct device *dev,
+ struct vme_resource * vme_master_request(struct vme_dev *dev,
vme_address_t aspace, vme_cycle_t cycle, vme_width_t width);

- struct vme_resource * vme_slave_request(struct device *dev,
+ struct vme_resource * vme_slave_request(struct vme_dev *dev,
vme_address_t aspace, vme_cycle_t cycle);

- struct vme_resource *vme_dma_request(struct device *dev,
+ struct vme_resource *vme_dma_request(struct vme_dev *dev,
vme_dma_route_t route);

For slave windows these attributes are split into those of type 'vme_address_t'
@@ -301,10 +320,10 @@ status ID combination. Any given combination can only be assigned a single
callback function. A void pointer parameter is provided, the value of which is
passed to the callback function, the use of this pointer is user undefined:

- int vme_irq_request(struct device *dev, int level, int statid,
+ int vme_irq_request(struct vme_dev *dev, int level, int statid,
void (*callback)(int, int, void *), void *priv);

- void vme_irq_free(struct device *dev, int level, int statid);
+ void vme_irq_free(struct vme_dev *dev, int level, int statid);

The callback parameters are as follows. Care must be taken in writing a callback
function, callback functions run in interrupt context:
@@ -318,7 +337,7 @@ Interrupt Generation
The following function can be used to generate a VME interrupt at a given VME
level and VME status ID:

- int vme_irq_generate(struct device *dev, int level, int statid);
+ int vme_irq_generate(struct vme_dev *dev, int level, int statid);


Location monitors
@@ -334,7 +353,7 @@ Location Monitor Management
The following functions are provided to request the use of a block of location
monitors and to free them after they are no longer required:

- struct vme_resource * vme_lm_request(struct device *dev);
+ struct vme_resource * vme_lm_request(struct vme_dev *dev);

void vme_lm_free(struct vme_resource * res);

@@ -380,4 +399,4 @@ Slot Detection

This function returns the slot ID of the provided bridge.

- int vme_slot_get(struct device *dev);
+ int vme_slot_get(struct vme_dev *dev);
diff --git a/drivers/staging/vme/vme_bridge.h b/drivers/staging/vme/vme_bridge.h
index 4b8566e..6dd2f4c 100644
--- a/drivers/staging/vme/vme_bridge.h
+++ b/drivers/staging/vme/vme_bridge.h
@@ -114,9 +114,8 @@ struct vme_bridge {
void *driver_priv; /* Private pointer for the bridge driver */
struct list_head bus_list; /* list of VME buses */

- struct device *dev[VME_SLOTS_MAX]; /* Device registered with
- * device model on VME bus
- */
+ struct vme_dev *dev[VME_SLOTS_MAX]; /* Device registered
+ * on VME bus */

/* Interrupt callbacks */
struct vme_irq irq[7];
--
1.7.4.1


\
 
 \ /
  Last update: 2011-08-31 12:11    [from the cache]
©2003-2011 Jasper Spaans