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path: root/drivers/i2c/busses/i2c-powermac.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-powermac.c')
-rw-r--r--drivers/i2c/busses/i2c-powermac.c98
1 files changed, 71 insertions, 27 deletions
diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
index 7b397c6f607..31c47e18d83 100644
--- a/drivers/i2c/busses/i2c-powermac.c
+++ b/drivers/i2c/busses/i2c-powermac.c
@@ -227,6 +227,72 @@ static int __devexit i2c_powermac_remove(struct platform_device *dev)
return 0;
}
+static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap,
+ struct pmac_i2c_bus *bus)
+{
+ struct i2c_client *newdev;
+ struct device_node *node;
+
+ for_each_child_of_node(adap->dev.of_node, node) {
+ struct i2c_board_info info = {};
+ struct dev_archdata dev_ad = {};
+ const __be32 *reg;
+ char tmp[16];
+ u32 addr;
+ int len;
+
+ /* Get address & channel */
+ reg = of_get_property(node, "reg", &len);
+ if (!reg || (len < sizeof(int))) {
+ dev_err(&adap->dev, "i2c-powermac: invalid reg on %s\n",
+ node->full_name);
+ continue;
+ }
+ addr = be32_to_cpup(reg);
+
+ /* Multibus setup, check channel */
+ if (!pmac_i2c_match_adapter(node, adap))
+ continue;
+
+ dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
+ node->full_name);
+
+ /* Make up a modalias. Note: we to _NOT_ want the standard
+ * i2c drivers to match with any of our powermac stuff
+ * unless they have been specifically modified to handle
+ * it on a case by case basis. For example, for thermal
+ * control, things like lm75 etc... shall match with their
+ * corresponding windfarm drivers, _NOT_ the generic ones,
+ * so we force a prefix of AAPL, onto the modalias to
+ * make that happen
+ */
+ if (of_modalias_node(node, tmp, sizeof(tmp)) < 0) {
+ dev_err(&adap->dev, "i2c-powermac: modalias failure"
+ " on %s\n", node->full_name);
+ continue;
+ }
+ snprintf(info.type, sizeof(info.type), "MAC,%s", tmp);
+
+ /* Fill out the rest of the info structure */
+ info.addr = (addr & 0xff) >> 1;
+ info.irq = irq_of_parse_and_map(node, 0);
+ info.of_node = of_node_get(node);
+ info.archdata = &dev_ad;
+
+ newdev = i2c_new_device(adap, &info);
+ if (!newdev) {
+ dev_err(&adap->dev, "i2c-powermac: Failure to register"
+ " %s\n", node->full_name);
+ of_node_put(node);
+ /* We do not dispose of the interrupt mapping on
+ * purpose. It's not necessary (interrupt cannot be
+ * re-used) and somebody else might have grabbed it
+ * via direct DT lookup so let's not bother
+ */
+ continue;
+ }
+ }
+}
static int __devinit i2c_powermac_probe(struct platform_device *dev)
{
@@ -272,6 +338,7 @@ static int __devinit i2c_powermac_probe(struct platform_device *dev)
adapter->algo = &i2c_powermac_algorithm;
i2c_set_adapdata(adapter, bus);
adapter->dev.parent = &dev->dev;
+ adapter->dev.of_node = dev->dev.of_node;
rc = i2c_add_adapter(adapter);
if (rc) {
printk(KERN_ERR "i2c-powermac: Adapter %s registration "
@@ -281,33 +348,10 @@ static int __devinit i2c_powermac_probe(struct platform_device *dev)
printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
- if (!strncmp(basename, "uni-n", 5)) {
- struct device_node *np;
- const u32 *prop;
- struct i2c_board_info info;
-
- /* Instantiate I2C motion sensor if present */
- np = of_find_node_by_name(NULL, "accelerometer");
- if (np && of_device_is_compatible(np, "AAPL,accelerometer_1") &&
- (prop = of_get_property(np, "reg", NULL))) {
- int i2c_bus;
- const char *tmp_bus;
-
- /* look for bus either using "reg" or by path */
- tmp_bus = strstr(np->full_name, "/i2c-bus@");
- if (tmp_bus)
- i2c_bus = *(tmp_bus + 9) - '0';
- else
- i2c_bus = ((*prop) >> 8) & 0x0f;
-
- if (pmac_i2c_get_channel(bus) == i2c_bus) {
- memset(&info, 0, sizeof(struct i2c_board_info));
- info.addr = ((*prop) & 0xff) >> 1;
- strlcpy(info.type, "ams", I2C_NAME_SIZE);
- i2c_new_device(adapter, &info);
- }
- }
- }
+ /* Cannot use of_i2c_register_devices() due to Apple device-tree
+ * funkyness
+ */
+ i2c_powermac_register_devices(adapter, bus);
return rc;
}