Re: [Linaro-acpi] [PATCH] acpi: DSM lookup value moved to acpi keyvalue file

Hi Graeme,

Thanks.

Sure, I will work on that.

Regards -Naresh

On 21 February 2014 19:11, Graeme Gregory graeme.gregory@linaro.org wrote:

Hi Naresh,

Patch looks good to me feel free to push it to your acpi-drivers branch.

If you want to test your git prowess you could actually rebase and squash it into the commit that add amba bus.

Just make sure the commit that creates acpi_keyvalue.c comes first.

Graeme

On Fri, Feb 21, 2014 at 06:47:35PM +0530, naresh.bhat@linaro.org wrote:

...

From: Naresh Bhat naresh.bhat@linaro.org

Remove duplicate code acpi_dsm_lookup_value is moved to acpi_keyvalue.c

file.

...

Signed-off-by: Naresh Bhat naresh.bhat@linaro.org

drivers/amba/acpi.c | 100

++-------------------------------------------------

...

1 file changed, 2 insertions(+), 98 deletions(-)

diff --git a/drivers/amba/acpi.c b/drivers/amba/acpi.c index 9a97cd8..abf4cd4 100644 --- a/drivers/amba/acpi.c +++ b/drivers/amba/acpi.c @@ -25,102 +25,6 @@ struct acpi_amba_bus_info { char *clk_name; };

-/* UUID: a706b112-bf0b-48d2-9fa3-95591a3c4c06 (randomly generated) */ -static const char acpi_amba_dsm_uuid[] = {

• 0xa7, 0x06, 0xb1, 0x12, 0xbf, 0x0b, 0x48, 0xd2,
  

• 0x9f, 0xa3, 0x95, 0x59, 0x1a, 0x3c, 0x4c, 0x06
  

-};

-/* acpi_amba_dsm_lookup()

• • Helper to parse through ACPI _DSM object for a device. Each entry
• • has three fields.
• */

-int acpi_amba_dsm_lookup(acpi_handle handle,

•         const char *tag, int index,
  

•         struct acpi_amba_dsm_entry *entry)
  

-{

• acpi_status status;
  

• struct acpi_object_list input;
  

• struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  

• union acpi_object params[4];
  

• union acpi_object *obj;
  

• int len, match_count, i;
  

• /* invalidate output in case there's no entry to supply */
  

• entry->key = NULL;
  

• entry->value = NULL;
  

• if (!acpi_has_method(handle, "_DSM"))
  

•         return -ENOENT;
  

• input.count = 4;
  

• params[0].type = ACPI_TYPE_BUFFER;              /* UUID */
  

• params[0].buffer.length = sizeof(acpi_amba_dsm_uuid);
  

• params[0].buffer.pointer = (char *)acpi_amba_dsm_uuid;
  

• params[1].type = ACPI_TYPE_INTEGER;             /* Revision */
  

• params[1].integer.value = 1;
  

• params[2].type = ACPI_TYPE_INTEGER;             /* Function # */
  

• params[2].integer.value = 1;
  

• params[3].type = ACPI_TYPE_PACKAGE;             /* Arguments */
  

• params[3].package.count = 0;
  

• params[3].package.elements = NULL;
  

• input.pointer = params;
  

• status = acpi_evaluate_object_typed(handle, "_DSM",
  

•                 &input, &output, ACPI_TYPE_PACKAGE);
  

• if (ACPI_FAILURE(status)) {
  

•         pr_err("failed to get _DSM package for this device\n");
  

•         return -ENOENT;
  

• }
  

• obj = (union acpi_object *)output.pointer;
  

• /* parse 2 objects per entry */
  

• match_count = 0;
  

• for (i = 0; (i + 2) <= obj->package.count; i += 2) {
  

•         /* key must be a string */
  

•         len = obj->package.elements[i].string.length;
  

•         if (len <= 0)
  

•                 continue;
  

•         /* check to see if this is the entry to return */
  

•         if (strncmp(tag, obj->package.elements[i].string.pointer,
  

•                         len) != 0 ||
  

•                         match_count < index) {
  

•                 match_count++;
  

•                 continue;
  

•         }
  

•         /* copy the key */
  

•         entry->key = kmalloc(len + 1, GFP_KERNEL);
  

•         strncpy(entry->key,
  

•                         obj->package.elements[i].string.pointer,
  

•                         len);
  

•         entry->key[len] = '\0';
  

•         /* value is a string with space-delimited fields if
  

necessary */

...

•         len = obj->package.elements[i + 1].string.length;
  

•         if (len > 0) {
  

•                 entry->value = kmalloc(len + 1, GFP_KERNEL);
  

•                 strncpy(entry->value,
  

•                         obj->package.elements[i+1].string.pointer,
  

•                         len);
  

•                 entry->value[len] = '\0';
  

•         }
  

•         break;
  

• }
  

• kfree(output.pointer);
  

• if (entry->key == NULL)
  

•         return -ENOENT;
  

• return 0;
  

-} -EXPORT_SYMBOL_GPL(acpi_amba_dsm_lookup);

static int acpi_amba_add_resource(struct acpi_resource *ares, void

*data)

...

{ struct amba_device *dev = data; @@ -157,7 +61,7 @@ static int acpi_amba_add_resource(struct

acpi_resource *ares, void *data)

...

static struct clk *acpi_amba_get_clk(acpi_handle handle, int index, char **clk_name) {

• struct acpi_amba_dsm_entry entry;
  

• struct acpi_dsm_entry entry;
  acpi_handle clk_handle;
  struct acpi_device *adev, *clk_adev;
  char *clk_path;
  

@@ -172,7 +76,7 @@ static struct clk *acpi_amba_get_clk(acpi_handle

handle, int index,

...

  /* key=value format for clocks is:
   *      "clock-name"="apb_pclk \\_SB.CLK0"
   */

• if (acpi_amba_dsm_lookup(handle, "clock-name", index, &entry) != 0)
  

• if (acpi_dsm_lookup_value(handle, "clock-name", index, &entry) !=
  

...

          return NULL;

  /* look under the clock device for the clock that matches the

entry */

...

-- 1.7.9.5

---

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