[PATCH v3 15/21] misc: support for LP-8x4x DIP switch

Sergei Ianovich
2013-12-17T19:37:45Z

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
---
v2..v3
* new patch

.../devicetree/bindings/misc/lp8x4x-bus.txt | 2 ++
Documentation/misc-devices/lp8x4x_bus.txt | 3 +++
arch/arm/boot/dts/pxa27x-lp8x4x.dts | 1 +
drivers/misc/lp8x4x_bus.c | 26 ++++++++++++++++++++++
4 files changed, 32 insertions(+)

diff --git a/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt b/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt
index 8a55020..1b1776a 100644
--- a/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt
+++ b/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt
@@ -7,6 +7,7 @@ Required properties:

- reg: physical base addresses and region lengths of
* the rotary switch
+ * the 8bit DIP switch
* the slot count register

Example:
@@ -14,5 +15,6 @@ Example:
backplane {
compatible = "icpdas,backplane-lp8x4x";
reg = <0x0 0x2
+ 0x9002 0x2
0x9046 0x2>;
};
diff --git a/Documentation/misc-devices/lp8x4x_bus.txt b/Documentation/misc-devices/lp8x4x_bus.txt
index bea435b..829781b 100644
--- a/Documentation/misc-devices/lp8x4x_bus.txt
+++ b/Documentation/misc-devices/lp8x4x_bus.txt
@@ -26,6 +26,9 @@ SYSFS

/sys/bus/icpdas/devices/backplane:

+dip
+ RO - shows status of LP-8x4x 8bit DIP switch
+
rotary
RO - shows position of LP-8x4x rotary switch (0-9)

diff --git a/arch/arm/boot/dts/pxa27x-lp8x4x.dts b/arch/arm/boot/dts/pxa27x-lp8x4x.dts
index b50ce43..09a6bc9 100644
--- a/arch/arm/boot/dts/pxa27x-lp8x4x.dts
+++ b/arch/arm/boot/dts/pxa27x-lp8x4x.dts
@@ -206,6 +206,7 @@
backplane {
compatible = "icpdas,backplane-lp8x4x";
reg = <0x0 0x2
+ 0x9002 0x2
0x9046 0x2>;
};
};
diff --git a/drivers/misc/lp8x4x_bus.c b/drivers/misc/lp8x4x_bus.c
index 18ca8f8..dfbc8c4 100644
--- a/drivers/misc/lp8x4x_bus.c
+++ b/drivers/misc/lp8x4x_bus.c
@@ -26,6 +26,7 @@ struct lp8x4x_master {
unsigned int slot_count;
void *count_addr;
void *rotary_addr;
+ void *dip_addr;
struct device dev;
};

@@ -67,9 +68,20 @@ static ssize_t rotary_show(struct device *dev,

static DEVICE_ATTR_RO(rotary);

+static ssize_t dip_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct lp8x4x_master *m = container_of(dev, struct lp8x4x_master, dev);
+
+ return sprintf(buf, "0x%02x\n", ioread8(m->dip_addr) ^ 0xff);
+}
+
+static DEVICE_ATTR_RO(dip);
+
static struct attribute *master_dev_attrs[] = {
&dev_attr_slot_count.attr,
&dev_attr_rotary.attr,
+ &dev_attr_dip.attr,
NULL,
};
ATTRIBUTE_GROUPS(master_dev);
@@ -118,6 +130,20 @@ static int __init lp8x4x_bus_probe(struct platform_device *pdev)

res = platform_get_resource(pdev, IORESOURCE_MEM, r++);
if (!res) {
+ dev_err(&pdev->dev, "Failed to get DIP switch address\n");
+ err = -ENODEV;
+ goto err_free;
+ }
+
+ m->dip_addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(m->dip_addr)) {
+ dev_err(&pdev->dev, "Failed to ioremap DIP switch address\n");
+ err = PTR_ERR(m->dip_addr);
+ goto err_free;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, r++);
+ if (!res) {
dev_err(&pdev->dev, "could not get slot count address\n");
err = -ENODEV;
goto err_free;
--
1.8.4.2