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path: root/drivers/firmware/dell_rbu.c
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Diffstat (limited to 'drivers/firmware/dell_rbu.c')
-rw-r--r--drivers/firmware/dell_rbu.c241
1 files changed, 145 insertions, 96 deletions
diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c
index 3b865f34a09..b6678239825 100644
--- a/drivers/firmware/dell_rbu.c
+++ b/drivers/firmware/dell_rbu.c
@@ -50,7 +50,7 @@
MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
MODULE_LICENSE("GPL");
-MODULE_VERSION("1.0");
+MODULE_VERSION("2.0");
#define BIOS_SCAN_LIMIT 0xffffffff
#define MAX_IMAGE_LENGTH 16
@@ -65,10 +65,11 @@ static struct _rbu_data {
unsigned long packet_write_count;
unsigned long num_packets;
unsigned long packetsize;
+ int entry_created;
} rbu_data;
-static char image_type[MAX_IMAGE_LENGTH] = "mono";
-module_param_string(image_type, image_type, sizeof(image_type), 0);
+static char image_type[MAX_IMAGE_LENGTH + 1] = "mono";
+module_param_string(image_type, image_type, sizeof (image_type), 0);
MODULE_PARM_DESC(image_type, "BIOS image type. choose- mono or packet");
struct packet_data {
@@ -114,7 +115,7 @@ static int fill_last_packet(void *data, size_t length)
if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) {
pr_debug("dell_rbu:%s: packet size data "
- "overrun\n", __FUNCTION__);
+ "overrun\n", __FUNCTION__);
return -EINVAL;
}
@@ -146,12 +147,14 @@ static int create_packet(size_t length)
pr_debug("create_packet: packetsize not specified\n");
return -EINVAL;
}
+ spin_unlock(&rbu_data.lock);
+ newpacket = kmalloc(sizeof (struct packet_data), GFP_KERNEL);
+ spin_lock(&rbu_data.lock);
- newpacket = kmalloc(sizeof(struct packet_data), GFP_KERNEL);
if (!newpacket) {
printk(KERN_WARNING
- "dell_rbu:%s: failed to allocate new "
- "packet\n", __FUNCTION__);
+ "dell_rbu:%s: failed to allocate new "
+ "packet\n", __FUNCTION__);
return -ENOMEM;
}
@@ -160,15 +163,17 @@ static int create_packet(size_t length)
* there is no upper limit on memory
* address for packetized mechanism
*/
- newpacket->data = (unsigned char *)__get_free_pages(GFP_KERNEL,
- ordernum);
+ spin_unlock(&rbu_data.lock);
+ newpacket->data = (unsigned char *) __get_free_pages(GFP_KERNEL,
+ ordernum);
+ spin_lock(&rbu_data.lock);
pr_debug("create_packet: newpacket %p\n", newpacket->data);
if (!newpacket->data) {
printk(KERN_WARNING
- "dell_rbu:%s: failed to allocate new "
- "packet\n", __FUNCTION__);
+ "dell_rbu:%s: failed to allocate new "
+ "packet\n", __FUNCTION__);
kfree(newpacket);
return -ENOMEM;
}
@@ -204,9 +209,8 @@ static int packetize_data(void *data, size_t length)
return rc;
}
-static int
-do_packet_read(char *data, struct list_head *ptemp_list,
- int length, int bytes_read, int *list_read_count)
+static int do_packet_read(char *data, struct list_head *ptemp_list,
+ int length, int bytes_read, int *list_read_count)
{
void *ptemp_buf;
struct packet_data *newpacket = NULL;
@@ -239,7 +243,7 @@ do_packet_read(char *data, struct list_head *ptemp_list,
return bytes_copied;
}
-static int packet_read_list(char *data, size_t * pread_length)
+static int packet_read_list(char *data, size_t *pread_length)
{
struct list_head *ptemp_list;
int temp_count = 0;
@@ -258,8 +262,7 @@ static int packet_read_list(char *data, size_t * pread_length)
ptemp_list = (&packet_data_head.list)->next;
while (!list_empty(ptemp_list)) {
bytes_copied = do_packet_read(pdest, ptemp_list,
- remaining_bytes, bytes_read,
- &temp_count);
+ remaining_bytes, bytes_read, &temp_count);
remaining_bytes -= bytes_copied;
bytes_read += bytes_copied;
pdest += bytes_copied;
@@ -287,7 +290,7 @@ static void packet_empty_list(void)
ptemp_list = (&packet_data_head.list)->next;
while (!list_empty(ptemp_list)) {
newpacket =
- list_entry(ptemp_list, struct packet_data, list);
+ list_entry(ptemp_list, struct packet_data, list);
pnext_list = ptemp_list->next;
list_del(ptemp_list);
ptemp_list = pnext_list;
@@ -296,8 +299,8 @@ static void packet_empty_list(void)
* to make sure there are no stale RBU packets left in memory
*/
memset(newpacket->data, 0, rbu_data.packetsize);
- free_pages((unsigned long)newpacket->data,
- newpacket->ordernum);
+ free_pages((unsigned long) newpacket->data,
+ newpacket->ordernum);
kfree(newpacket);
}
rbu_data.packet_write_count = 0;
@@ -319,14 +322,13 @@ static void img_update_free(void)
* BIOS image copied in memory.
*/
memset(rbu_data.image_update_buffer, 0,
- rbu_data.image_update_buffer_size);
+ rbu_data.image_update_buffer_size);
if (rbu_data.dma_alloc == 1)
dma_free_coherent(NULL, rbu_data.bios_image_size,
- rbu_data.image_update_buffer,
- dell_rbu_dmaaddr);
+ rbu_data.image_update_buffer, dell_rbu_dmaaddr);
else
- free_pages((unsigned long)rbu_data.image_update_buffer,
- rbu_data.image_update_ordernum);
+ free_pages((unsigned long) rbu_data.image_update_buffer,
+ rbu_data.image_update_ordernum);
/*
* Re-initialize the rbu_data variables after a free
@@ -366,7 +368,7 @@ static int img_update_realloc(unsigned long size)
*/
if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
printk(KERN_ERR "dell_rbu:%s: corruption "
- "check failed\n", __FUNCTION__);
+ "check failed\n", __FUNCTION__);
return -EINVAL;
}
/*
@@ -385,17 +387,16 @@ static int img_update_realloc(unsigned long size)
ordernum = get_order(size);
image_update_buffer =
- (unsigned char *)__get_free_pages(GFP_KERNEL, ordernum);
+ (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum);
img_buf_phys_addr =
- (unsigned long)virt_to_phys(image_update_buffer);
+ (unsigned long) virt_to_phys(image_update_buffer);
if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
- free_pages((unsigned long)image_update_buffer, ordernum);
+ free_pages((unsigned long) image_update_buffer, ordernum);
ordernum = -1;
image_update_buffer = dma_alloc_coherent(NULL, size,
- &dell_rbu_dmaaddr,
- GFP_KERNEL);
+ &dell_rbu_dmaaddr, GFP_KERNEL);
dma_alloc = 1;
}
@@ -405,13 +406,13 @@ static int img_update_realloc(unsigned long size)
rbu_data.image_update_buffer = image_update_buffer;
rbu_data.image_update_buffer_size = size;
rbu_data.bios_image_size =
- rbu_data.image_update_buffer_size;
+ rbu_data.image_update_buffer_size;
rbu_data.image_update_ordernum = ordernum;
rbu_data.dma_alloc = dma_alloc;
rc = 0;
} else {
pr_debug("Not enough memory for image update:"
- "size = %ld\n", size);
+ "size = %ld\n", size);
rc = -ENOMEM;
}
@@ -438,7 +439,7 @@ static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
if (pos > imagesize) {
retval = 0;
printk(KERN_WARNING "dell_rbu:read_packet_data: "
- "data underrun\n");
+ "data underrun\n");
goto read_rbu_data_exit;
}
@@ -468,11 +469,11 @@ static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
/* check to see if we have something to return */
if ((rbu_data.image_update_buffer == NULL) ||
- (rbu_data.bios_image_size == 0)) {
+ (rbu_data.bios_image_size == 0)) {
pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
- "bios_image_size %lu\n",
- rbu_data.image_update_buffer,
- rbu_data.bios_image_size);
+ "bios_image_size %lu\n",
+ rbu_data.image_update_buffer,
+ rbu_data.bios_image_size);
ret_count = -ENOMEM;
goto read_rbu_data_exit;
}
@@ -497,8 +498,8 @@ static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
return ret_count;
}
-static ssize_t
-read_rbu_data(struct kobject *kobj, char *buffer, loff_t pos, size_t count)
+static ssize_t read_rbu_data(struct kobject *kobj, char *buffer,
+ loff_t pos, size_t count)
{
ssize_t ret_count = 0;
@@ -515,62 +516,20 @@ read_rbu_data(struct kobject *kobj, char *buffer, loff_t pos, size_t count)
return ret_count;
}
-static ssize_t
-read_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos,
- size_t count)
-{
- int size = 0;
- if (!pos)
- size = sprintf(buffer, "%s\n", image_type);
- return size;
-}
-
-static ssize_t
-write_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos,
- size_t count)
-{
- int rc = count;
- spin_lock(&rbu_data.lock);
-
- if (strlen(buffer) < MAX_IMAGE_LENGTH)
- sscanf(buffer, "%s", image_type);
- else
- printk(KERN_WARNING "dell_rbu: image_type is invalid"
- "max chars = %d, \n incoming str--%s-- \n",
- MAX_IMAGE_LENGTH, buffer);
-
- /* we must free all previous allocations */
- packet_empty_list();
- img_update_free();
-
- spin_unlock(&rbu_data.lock);
- return rc;
-
-}
-
-static struct bin_attribute rbu_data_attr = {
- .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
- .read = read_rbu_data,
-};
-
-static struct bin_attribute rbu_image_type_attr = {
- .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
- .read = read_rbu_image_type,
- .write = write_rbu_image_type,
-};
-
static void callbackfn_rbu(const struct firmware *fw, void *context)
{
int rc = 0;
- if (!fw || !fw->size)
+ if (!fw || !fw->size) {
+ rbu_data.entry_created = 0;
return;
+ }
spin_lock(&rbu_data.lock);
if (!strcmp(image_type, "mono")) {
if (!img_update_realloc(fw->size))
memcpy(rbu_data.image_update_buffer,
- fw->data, fw->size);
+ fw->data, fw->size);
} else if (!strcmp(image_type, "packet")) {
if (!rbu_data.packetsize)
rbu_data.packetsize = fw->size;
@@ -584,14 +543,103 @@ static void callbackfn_rbu(const struct firmware *fw, void *context)
spin_unlock(&rbu_data.lock);
rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
- "dell_rbu", &rbu_device->dev,
- &context, callbackfn_rbu);
+ "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu);
if (rc)
printk(KERN_ERR
- "dell_rbu:%s request_firmware_nowait failed"
- " %d\n", __FUNCTION__, rc);
+ "dell_rbu:%s request_firmware_nowait failed"
+ " %d\n", __FUNCTION__, rc);
+ else
+ rbu_data.entry_created = 1;
+}
+
+static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer,
+ loff_t pos, size_t count)
+{
+ int size = 0;
+ if (!pos)
+ size = sprintf(buffer, "%s\n", image_type);
+ return size;
+}
+
+static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer,
+ loff_t pos, size_t count)
+{
+ int rc = count;
+ int req_firm_rc = 0;
+ int i;
+ spin_lock(&rbu_data.lock);
+ /*
+ * Find the first newline or space
+ */
+ for (i = 0; i < count; ++i)
+ if (buffer[i] == '\n' || buffer[i] == ' ') {
+ buffer[i] = '\0';
+ break;
+ }
+ if (i == count)
+ buffer[count] = '\0';
+
+ if (strstr(buffer, "mono"))
+ strcpy(image_type, "mono");
+ else if (strstr(buffer, "packet"))
+ strcpy(image_type, "packet");
+ else if (strstr(buffer, "init")) {
+ /*
+ * If due to the user error the driver gets in a bad
+ * state where even though it is loaded , the
+ * /sys/class/firmware/dell_rbu entries are missing.
+ * to cover this situation the user can recreate entries
+ * by writing init to image_type.
+ */
+ if (!rbu_data.entry_created) {
+ spin_unlock(&rbu_data.lock);
+ req_firm_rc = request_firmware_nowait(THIS_MODULE,
+ FW_ACTION_NOHOTPLUG, "dell_rbu",
+ &rbu_device->dev, &context,
+ callbackfn_rbu);
+ if (req_firm_rc) {
+ printk(KERN_ERR
+ "dell_rbu:%s request_firmware_nowait"
+ " failed %d\n", __FUNCTION__, rc);
+ rc = -EIO;
+ } else
+ rbu_data.entry_created = 1;
+
+ spin_lock(&rbu_data.lock);
+ }
+ } else {
+ printk(KERN_WARNING "dell_rbu: image_type is invalid\n");
+ spin_unlock(&rbu_data.lock);
+ return -EINVAL;
+ }
+
+ /* we must free all previous allocations */
+ packet_empty_list();
+ img_update_free();
+ spin_unlock(&rbu_data.lock);
+
+ return rc;
}
+static struct bin_attribute rbu_data_attr = {
+ .attr = {
+ .name = "data",
+ .owner = THIS_MODULE,
+ .mode = 0444,
+ },
+ .read = read_rbu_data,
+};
+
+static struct bin_attribute rbu_image_type_attr = {
+ .attr = {
+ .name = "image_type",
+ .owner = THIS_MODULE,
+ .mode = 0644,
+ },
+ .read = read_rbu_image_type,
+ .write = write_rbu_image_type,
+};
+
static int __init dcdrbu_init(void)
{
int rc = 0;
@@ -599,11 +647,11 @@ static int __init dcdrbu_init(void)
init_packet_head();
rbu_device =
- platform_device_register_simple("dell_rbu", -1, NULL, 0);
+ platform_device_register_simple("dell_rbu", -1, NULL, 0);
if (!rbu_device) {
printk(KERN_ERR
- "dell_rbu:%s:platform_device_register_simple "
- "failed\n", __FUNCTION__);
+ "dell_rbu:%s:platform_device_register_simple "
+ "failed\n", __FUNCTION__);
return -EIO;
}
@@ -611,11 +659,12 @@ static int __init dcdrbu_init(void)
sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
- "dell_rbu", &rbu_device->dev,
- &context, callbackfn_rbu);
+ "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu);
if (rc)
printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait"
- " failed %d\n", __FUNCTION__, rc);
+ " failed %d\n", __FUNCTION__, rc);
+ else
+ rbu_data.entry_created = 1;
return rc;