diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-powermac.c | 157 |
1 files changed, 133 insertions, 24 deletions
diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c index 31c47e18d83c..5285f8565de4 100644 --- a/drivers/i2c/busses/i2c-powermac.c +++ b/drivers/i2c/busses/i2c-powermac.c @@ -227,28 +227,138 @@ static int __devexit i2c_powermac_remove(struct platform_device *dev) return 0; } +static u32 __devinit i2c_powermac_get_addr(struct i2c_adapter *adap, + struct pmac_i2c_bus *bus, + struct device_node *node) +{ + const __be32 *prop; + int len; + + /* First check for valid "reg" */ + prop = of_get_property(node, "reg", &len); + if (prop && (len >= sizeof(int))) + return (be32_to_cpup(prop) & 0xff) >> 1; + + /* Then check old-style "i2c-address" */ + prop = of_get_property(node, "i2c-address", &len); + if (prop && (len >= sizeof(int))) + return (be32_to_cpup(prop) & 0xff) >> 1; + + /* Now handle some devices with missing "reg" properties */ + if (!strcmp(node->name, "cereal")) + return 0x60; + else if (!strcmp(node->name, "deq")) + return 0x34; + + dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name); + + return 0xffffffff; +} + +static void __devinit i2c_powermac_create_one(struct i2c_adapter *adap, + const char *type, + u32 addr) +{ + struct i2c_board_info info = {}; + struct i2c_client *newdev; + + strncpy(info.type, type, sizeof(info.type)); + info.addr = addr; + newdev = i2c_new_device(adap, &info); + if (!newdev) + dev_err(&adap->dev, + "i2c-powermac: Failure to register missing %s\n", + type); +} + +static void __devinit i2c_powermac_add_missing(struct i2c_adapter *adap, + struct pmac_i2c_bus *bus, + bool found_onyx) +{ + struct device_node *busnode = pmac_i2c_get_bus_node(bus); + int rc; + + /* Check for the onyx audio codec */ +#define ONYX_REG_CONTROL 67 + if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) { + union i2c_smbus_data data; + + rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ, + ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA, + &data); + if (rc >= 0) + i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46); + + rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ, + ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA, + &data); + if (rc >= 0) + i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47); + } +} + +static bool __devinit i2c_powermac_get_type(struct i2c_adapter *adap, + struct device_node *node, + u32 addr, char *type, int type_size) +{ + char tmp[16]; + + /* 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 + */ + + /* First try proper modalias */ + if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) { + snprintf(type, type_size, "MAC,%s", tmp); + return true; + } + + /* Now look for known workarounds */ + if (!strcmp(node->name, "deq")) { + /* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */ + if (addr == 0x34) { + snprintf(type, type_size, "MAC,tas3001"); + return true; + } else if (addr == 0x35) { + snprintf(type, type_size, "MAC,tas3004"); + return true; + } + } + + dev_err(&adap->dev, "i2c-powermac: modalias failure" + " on %s\n", node->full_name); + return false; +} + static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap, struct pmac_i2c_bus *bus) { struct i2c_client *newdev; struct device_node *node; + bool found_onyx = 0; + + /* + * In some cases we end up with the via-pmu node itself, in this + * case we skip this function completely as the device-tree will + * not contain anything useful. + */ + if (!strcmp(adap->dev.of_node->name, "via-pmu")) + return; 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); + addr = i2c_powermac_get_addr(adap, bus, node); + if (addr == 0xffffffff) continue; - } - addr = be32_to_cpup(reg); /* Multibus setup, check channel */ if (!pmac_i2c_match_adapter(node, adap)) @@ -257,27 +367,23 @@ static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap, 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 + /* + * Keep track of some device existence to handle + * workarounds later. */ - if (of_modalias_node(node, tmp, sizeof(tmp)) < 0) { - dev_err(&adap->dev, "i2c-powermac: modalias failure" - " on %s\n", node->full_name); + if (of_device_is_compatible(node, "pcm3052")) + found_onyx = true; + + /* Make up a modalias */ + if (!i2c_powermac_get_type(adap, node, addr, + info.type, sizeof(info.type))) { continue; } - snprintf(info.type, sizeof(info.type), "MAC,%s", tmp); /* Fill out the rest of the info structure */ - info.addr = (addr & 0xff) >> 1; + info.addr = addr; 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) { @@ -292,6 +398,9 @@ static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap, continue; } } + + /* Additional workarounds */ + i2c_powermac_add_missing(adap, bus, found_onyx); } static int __devinit i2c_powermac_probe(struct platform_device *dev) |