Signed-off-by: Sergei Ianovich <ynvich@xxxxxxxxx>
---
v3..v4
* move DTS binding to a different patch (8/21)
v2..v3
* new patch
.../devicetree/bindings/misc/lp8x4x-bus.txt | 8 ++--
Documentation/misc-devices/lp8x4x_bus.txt | 3 ++
drivers/misc/lp8x4x_bus.c | 43 ++++++++++++++++++----
3 files changed, 43 insertions(+), 11 deletions(-)
diff --git a/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt b/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt
index 1c87a29..8a55020 100644
--- a/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt
+++ b/Documentation/devicetree/bindings/misc/lp8x4x-bus.txt
@@ -5,12 +5,14 @@ See Documentation/misc-devices/lp8x4x_bus.txt for details.
Required properties:
- compatible : should be "icpdas,backplane-lp8x4x"
-- reg: physical base address of the slot count register and the length
- of the memory mapped region.
+- reg: physical base addresses and region lengths of
+ * the rotary switch
+ * the slot count register
Example:
backplane {
compatible = "icpdas,backplane-lp8x4x";
- reg = <0x17009046 0x2>;
+ reg = <0x0 0x2
+ 0x9046 0x2>;
};
diff --git a/Documentation/misc-devices/lp8x4x_bus.txt b/Documentation/misc-devices/lp8x4x_bus.txt
index f5392b3..bea435b 100644
--- a/Documentation/misc-devices/lp8x4x_bus.txt
+++ b/Documentation/misc-devices/lp8x4x_bus.txt
@@ -26,5 +26,8 @@ SYSFS
/sys/bus/icpdas/devices/backplane:
+rotary
+ RO - shows position of LP-8x4x rotary switch (0-9)
+
slot_count
RO - shows total number of expansion slots on the device
diff --git a/drivers/misc/lp8x4x_bus.c b/drivers/misc/lp8x4x_bus.c
index 7aa55cf..18ca8f8 100644
--- a/drivers/misc/lp8x4x_bus.c
+++ b/drivers/misc/lp8x4x_bus.c
@@ -25,6 +25,7 @@ MODULE_DESCRIPTION("ICP DAS LP-8x4x parallel bus driver");
struct lp8x4x_master {
unsigned int slot_count;
void *count_addr;
+ void *rotary_addr;
struct device dev;
};
@@ -56,8 +57,19 @@ static ssize_t slot_count_show(struct device *dev,
static DEVICE_ATTR_RO(slot_count);
+static ssize_t rotary_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct lp8x4x_master *m = container_of(dev, struct lp8x4x_master, dev);
+
+ return sprintf(buf, "%u\n", (ioread8(m->rotary_addr) ^ 0xf) & 0xf);
+}
+
+static DEVICE_ATTR_RO(rotary);
+
static struct attribute *master_dev_attrs[] = {
&dev_attr_slot_count.attr,
+ &dev_attr_rotary.attr,
NULL,
};
ATTRIBUTE_GROUPS(master_dev);
@@ -76,6 +88,7 @@ static int __init lp8x4x_bus_probe(struct platform_device *pdev)
{
struct lp8x4x_master *m, **p;
struct resource *res;
+ int r = 0;
int err = 0;
m = kzalloc(sizeof(*m), GFP_KERNEL);
@@ -89,18 +102,32 @@ static int __init lp8x4x_bus_probe(struct platform_device *pdev)
}
*p = m;
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, r++);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed to get rotary address\n");
+ err = -ENODEV;
+ goto err_free;
+ }
+
+ m->rotary_addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(m->rotary_addr)) {
+ dev_err(&pdev->dev, "Failed to ioremap rotary address\n");
+ err = PTR_ERR(m->rotary_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 err2;
+ goto err_free;
}
m->count_addr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(m->count_addr)) {
dev_err(&pdev->dev, "Failed to ioremap slot count address\n");
err = PTR_ERR(m->count_addr);
- goto err2;
+ goto err_free;
}
m->slot_count = ioread8(m->count_addr);
@@ -115,7 +142,7 @@ static int __init lp8x4x_bus_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "unexpected slot number(%u)",
m->slot_count);
err = -ENODEV;
- goto err2;
+ goto err_free;
};
dev_info(&pdev->dev, "found bus with up to %u slots\n", m->slot_count);
@@ -123,7 +150,7 @@ static int __init lp8x4x_bus_probe(struct platform_device *pdev)
err = bus_register(&lp8x4x_bus_type);
if (err < 0) {
dev_err(&pdev->dev, "failed to register bus type\n");
- goto err2;
+ goto err_free;
}
m->dev.bus = &lp8x4x_bus_type;
@@ -135,15 +162,15 @@ static int __init lp8x4x_bus_probe(struct platform_device *pdev)
err = device_register(&m->dev);
if (err < 0) {
dev_err(&pdev->dev, "failed to register backplane device\n");
- goto err3;
+ goto err_bus;
}
devres_add(&pdev->dev, p);
return 0;
-err3:
+err_bus:
bus_unregister(&lp8x4x_bus_type);
-err2:
+err_free:
devres_free(p);
err1:
kfree(m);
--
1.8.4.2
--
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