platform/chrome: chromeos_laptop - Add support for Acer C720

Acer C720 has touchpad and light sensor connected to a separate I2C buses.
Since the designware I2C host controller driver has two instances on this
particular machine we need a way to match the correct instance. Add support
for this and then register both C720 touchpad and light sensor.

This code is based on following patch from Benson Leung:

https://patchwork.kernel.org/patch/3074411/

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/drivers/platform/chrome/chromeos_laptop.c b/drivers/platform/chrome/chromeos_laptop.c
index 7f1a2e2..a241e5f 100644 (file)
--- a/drivers/platform/chrome/chromeos_laptop.c
+++ b/drivers/platform/chrome/chromeos_laptop.c
@@ -45,6 +45,8 @@ static const char *i2c_adapter_names[] = {
        "SMBus I801 adapter",
        "i915 gmbus vga",
        "i915 gmbus panel",
+       "i2c-designware-pci",
+       "i2c-designware-pci",
 };
 
 /* Keep this enum consistent with i2c_adapter_names */
@@ -52,6 +54,8 @@ enum i2c_adapter_type {
        I2C_ADAPTER_SMBUS = 0,
        I2C_ADAPTER_VGADDC,
        I2C_ADAPTER_PANEL,
+       I2C_ADAPTER_DESIGNWARE_0,
+       I2C_ADAPTER_DESIGNWARE_1,
 };
 
 struct i2c_peripheral {
@@ -172,29 +176,42 @@ static struct i2c_client *__add_probed_i2c_device(
        return client;
 }
 
+struct i2c_lookup {
+       const char *name;
+       int instance;
+       int n;
+};
+
 static int __find_i2c_adap(struct device *dev, void *data)
 {
-       const char *name = data;
+       struct i2c_lookup *lookup = data;
        static const char *prefix = "i2c-";
        struct i2c_adapter *adapter;
        if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
                return 0;
        adapter = to_i2c_adapter(dev);
-       return (strncmp(adapter->name, name, strlen(name)) == 0);
+       if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
+           lookup->n++ == lookup->instance)
+               return 1;
+       return 0;
 }
 
 static int find_i2c_adapter_num(enum i2c_adapter_type type)
 {
        struct device *dev = NULL;
        struct i2c_adapter *adapter;
-       const char *name = i2c_adapter_names[type];
+       struct i2c_lookup lookup;
+
+       memset(&lookup, 0, sizeof(lookup));
+       lookup.name = i2c_adapter_names[type];
+       lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
+
        /* find the adapter by name */
-       dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
-                             __find_i2c_adap);
+       dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
        if (!dev) {
                /* Adapters may appear later. Deferred probing will retry */
                pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
-                         name);
+                         lookup.name);
                return -ENODEV;
        }
        adapter = to_i2c_adapter(dev);
@@ -377,6 +394,15 @@ static struct chromeos_laptop acer_ac700 = {
        },
 };
 
+static struct chromeos_laptop acer_c720 = {
+       .i2c_peripherals = {
+               /* Touchpad. */
+               { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
+               /* Light Sensor. */
+               { .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
+       },
+};
+
 static struct chromeos_laptop hp_pavilion_14_chromebook = {
        .i2c_peripherals = {
                /* Touchpad. */
@@ -433,6 +459,13 @@ static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
                },
                _CBDD(acer_ac700),
        },
+       {
+               .ident = "Acer C720",
+               .matches = {
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
+               },
+               _CBDD(acer_c720),
+       },
        {
                .ident = "HP Pavilion 14 Chromebook",
                .matches = {