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authorAndres Salomon <dilinger@queued.net>2011-02-18 04:07:36 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2011-03-23 10:41:58 +0100
commit1310e6d638b302bd9cd064f8de7dcd546bb7f597 (patch)
tree381e845cded4c75a6a6430db5b2c05da7194fa05 /drivers/mfd
parentmfd: add platform_device sharing support for mfd (diff)
downloadlinux-1310e6d638b302bd9cd064f8de7dcd546bb7f597.tar.xz
linux-1310e6d638b302bd9cd064f8de7dcd546bb7f597.zip
mfd: Add sharing for cs5535 acpi/pms cells
This enables sharing of cs5535-mfd cells via the new mfd_shared_* API. Hooks for enable/disble of resources are added, with refcounting of resources being automatically handled so that cs5535_mfd_res_enable/disable are only called when necessary. Clients of cs5535-mfd (in this case, olpc-xo1.c) are also modified to use the mfd_shared API. The platform drivers are also renamed to olpc-xo1-{pms,acpi}, and resource enabling/disabling is replaced with mfd_shared API calls. Signed-off-by: Andres Salomon <dilinger@queued.net> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/cs5535-mfd.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
index 59ca6f151e78..886a06871065 100644
--- a/drivers/mfd/cs5535-mfd.c
+++ b/drivers/mfd/cs5535-mfd.c
@@ -39,6 +39,37 @@ enum cs5535_mfd_bars {
NR_BARS,
};
+static int cs5535_mfd_res_enable(struct platform_device *pdev)
+{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "can't fetch device resource info\n");
+ return -EIO;
+ }
+
+ if (!request_region(res->start, resource_size(res), DRV_NAME)) {
+ dev_err(&pdev->dev, "can't request region\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int cs5535_mfd_res_disable(struct platform_device *pdev)
+{
+ struct resource *res;
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "can't fetch device resource info\n");
+ return -EIO;
+ }
+
+ release_region(res->start, resource_size(res));
+ return 0;
+}
+
static __devinitdata struct resource cs5535_mfd_resources[NR_BARS];
static __devinitdata struct mfd_cell cs5535_mfd_cells[] = {
@@ -65,12 +96,18 @@ static __devinitdata struct mfd_cell cs5535_mfd_cells[] = {
.name = "cs5535-pms",
.num_resources = 1,
.resources = &cs5535_mfd_resources[PMS_BAR],
+
+ .enable = cs5535_mfd_res_enable,
+ .disable = cs5535_mfd_res_disable,
},
{
.id = ACPI_BAR,
.name = "cs5535-acpi",
.num_resources = 1,
.resources = &cs5535_mfd_resources[ACPI_BAR],
+
+ .enable = cs5535_mfd_res_enable,
+ .disable = cs5535_mfd_res_disable,
},
};