3 files changed, 438 insertions, 0 deletions

diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
new file mode 100644
index 000000000000..b13303e75a34
--- /dev/null
+++ b/drivers/platform/chrome/Kconfig
@@ -0,0 +1,28 @@
+#
+# Platform support for Chrome OS hardware (Chromebooks and Chromeboxes)
+#
+
+menuconfig CHROME_PLATFORMS
+        bool "Platform support for Chrome hardware"
+        depends on X86
+        ---help---
+          Say Y here to get to see options for platform support for
+          various Chromebooks and Chromeboxes. This option alone does
+          not add any kernel code.
+
+          If you say N, all options in this submenu will be skipped and disabled.
+
+if CHROME_PLATFORMS
+
+config CHROMEOS_LAPTOP
+        tristate "Chrome OS Laptop"
+        depends on I2C
+        depends on DMI
+        ---help---
+          This driver instantiates i2c and smbus devices such as
+          light sensors and touchpads.
+
+          If you have a supported Chromebook, choose Y or M here.
+          The module will be called chromeos_laptop.
+
+endif # CHROMEOS_PLATFORMS
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
new file mode 100644
index 000000000000..015e9195e226
--- /dev/null
+++ b/drivers/platform/chrome/Makefile
@@ -0,0 +1,2 @@
+
+obj-$(CONFIG_CHROMEOS_LAPTOP)   += chromeos_laptop.o
diff --git a/drivers/platform/chrome/chromeos_laptop.c b/drivers/platform/chrome/chromeos_laptop.c
new file mode 100644
index 000000000000..3e5b4497a1d0
--- /dev/null
+++ b/drivers/platform/chrome/chromeos_laptop.c
@@ -0,0 +1,408 @@
+/*
+ *  chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
+ *
+ *  Author : Benson Leung <bleung@chromium.org>
+ *
+ *  Copyright (C) 2012 Google, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/dmi.h>
+#include <linux/i2c.h>
+#include <linux/i2c/atmel_mxt_ts.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+
+#define ATMEL_TP_I2C_ADDR       0x4b
+#define ATMEL_TP_I2C_BL_ADDR    0x25
+#define ATMEL_TS_I2C_ADDR       0x4a
+#define ATMEL_TS_I2C_BL_ADDR    0x26
+#define CYAPA_TP_I2C_ADDR       0x67
+#define ISL_ALS_I2C_ADDR        0x44
+#define TAOS_ALS_I2C_ADDR       0x29
+
+static struct i2c_client *als;
+static struct i2c_client *tp;
+static struct i2c_client *ts;
+
+const char *i2c_adapter_names[] = {
+        "SMBus I801 adapter",
+        "i915 gmbus vga",
+        "i915 gmbus panel",
+};
+
+/* Keep this enum consistent with i2c_adapter_names */
+enum i2c_adapter_type {
+        I2C_ADAPTER_SMBUS = 0,
+        I2C_ADAPTER_VGADDC,
+        I2C_ADAPTER_PANEL,
+};
+
+static struct i2c_board_info __initdata cyapa_device = {
+        I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
+        .flags          = I2C_CLIENT_WAKE,
+};
+
+static struct i2c_board_info __initdata isl_als_device = {
+        I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
+};
+
+static struct i2c_board_info __initdata tsl2583_als_device = {
+        I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
+};
+
+static struct i2c_board_info __initdata tsl2563_als_device = {
+        I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
+};
+
+static struct mxt_platform_data atmel_224s_tp_platform_data = {
+        .x_line                 = 18,
+        .y_line                 = 12,
+        .x_size                 = 102*20,
+        .y_size                 = 68*20,
+        .blen                   = 0x80, /* Gain setting is in upper 4 bits */
+        .threshold              = 0x32,
+        .voltage                = 0,    /* 3.3V */
+        .orient                 = MXT_VERTICAL_FLIP,
+        .irqflags               = IRQF_TRIGGER_FALLING,
+        .is_tp                  = true,
+        .key_map                = { KEY_RESERVED,
+                                    KEY_RESERVED,
+                                    KEY_RESERVED,
+                                    BTN_LEFT },
+        .config                 = NULL,
+        .config_length          = 0,
+};
+
+static struct i2c_board_info __initdata atmel_224s_tp_device = {
+        I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
+        .platform_data = &atmel_224s_tp_platform_data,
+        .flags          = I2C_CLIENT_WAKE,
+};
+
+static struct mxt_platform_data atmel_1664s_platform_data = {
+        .x_line                 = 32,
+        .y_line                 = 50,
+        .x_size                 = 1700,
+        .y_size                 = 2560,
+        .blen                   = 0x89, /* Gain setting is in upper 4 bits */
+        .threshold              = 0x28,
+        .voltage                = 0,    /* 3.3V */
+        .orient                 = MXT_ROTATED_90_COUNTER,
+        .irqflags               = IRQF_TRIGGER_FALLING,
+        .is_tp                  = false,
+        .config                 = NULL,
+        .config_length          = 0,
+};
+
+static struct i2c_board_info __initdata atmel_1664s_device = {
+        I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
+        .platform_data = &atmel_1664s_platform_data,
+        .flags          = I2C_CLIENT_WAKE,
+};
+
+static struct i2c_client __init *__add_probed_i2c_device(
+                const char *name,
+                int bus,
+                struct i2c_board_info *info,
+                const unsigned short *addrs)
+{
+        const struct dmi_device *dmi_dev;
+        const struct dmi_dev_onboard *dev_data;
+        struct i2c_adapter *adapter;
+        struct i2c_client *client;
+
+        if (bus < 0)
+                return NULL;
+        /*
+         * If a name is specified, look for irq platform information stashed
+         * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
+         */
+        if (name) {
+                dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
+                if (!dmi_dev) {
+                        pr_err("%s failed to dmi find device %s.\n",
+                               __func__,
+                               name);
+                        return NULL;
+                }
+                dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
+                if (!dev_data) {
+                        pr_err("%s failed to get data from dmi for %s.\n",
+                               __func__, name);
+                        return NULL;
+                }
+                info->irq = dev_data->instance;
+        }
+
+        adapter = i2c_get_adapter(bus);
+        if (!adapter) {
+                pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
+                return NULL;
+        }
+
+        /* add the i2c device */
+        client = i2c_new_probed_device(adapter, info, addrs, NULL);
+        if (!client)
+                pr_err("%s failed to register device %d-%02x\n",
+                       __func__, bus, info->addr);
+        else
+                pr_debug("%s added i2c device %d-%02x\n",
+                         __func__, bus, info->addr);
+
+        i2c_put_adapter(adapter);
+        return client;
+}
+
+static int __init __find_i2c_adap(struct device *dev, void *data)
+{
+        const char *name = 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);
+}
+
+static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
+{
+        struct device *dev = NULL;
+        struct i2c_adapter *adapter;
+        const char *name = i2c_adapter_names[type];
+        /* find the adapter by name */
+        dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
+                              __find_i2c_adap);
+        if (!dev) {
+                pr_err("%s: i2c adapter %s not found on system.\n", __func__,
+                       name);
+                return -ENODEV;
+        }
+        adapter = to_i2c_adapter(dev);
+        return adapter->nr;
+}
+
+/*
+ * Takes a list of addresses in addrs as such :
+ * { addr1, ... , addrn, I2C_CLIENT_END };
+ * add_probed_i2c_device will use i2c_new_probed_device
+ * and probe for devices at all of the addresses listed.
+ * Returns NULL if no devices found.
+ * See Documentation/i2c/instantiating-devices for more information.
+ */
+static __init struct i2c_client *add_probed_i2c_device(
+                const char *name,
+                enum i2c_adapter_type type,
+                struct i2c_board_info *info,
+                const unsigned short *addrs)
+{
+        return __add_probed_i2c_device(name,
+                                       find_i2c_adapter_num(type),
+                                       info,
+                                       addrs);
+}
+
+/*
+ * Probes for a device at a single address, the one provided by
+ * info->addr.
+ * Returns NULL if no device found.
+ */
+static __init struct i2c_client *add_i2c_device(const char *name,
+                                                enum i2c_adapter_type type,
+                                                struct i2c_board_info *info)
+{
+        const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
+        return __add_probed_i2c_device(name,
+                                       find_i2c_adapter_num(type),
+                                       info,
+                                       addr_list);
+}
+
+
+static struct i2c_client __init *add_smbus_device(const char *name,
+                                                  struct i2c_board_info *info)
+{
+        return add_i2c_device(name, I2C_ADAPTER_SMBUS, info);
+}
+
+static int __init setup_cyapa_smbus_tp(const struct dmi_system_id *id)
+{
+        /* add cyapa touchpad on smbus */
+        tp = add_smbus_device("trackpad", &cyapa_device);
+        return 0;
+}
+
+static int __init setup_atmel_224s_tp(const struct dmi_system_id *id)
+{
+        const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
+                                             ATMEL_TP_I2C_ADDR,
+                                             I2C_CLIENT_END };
+
+        /* add atmel mxt touchpad on VGA DDC GMBus */
+        tp = add_probed_i2c_device("trackpad", I2C_ADAPTER_VGADDC,
+                                   &atmel_224s_tp_device, addr_list);
+        return 0;
+}
+
+static int __init setup_atmel_1664s_ts(const struct dmi_system_id *id)
+{
+        const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
+                                             ATMEL_TS_I2C_ADDR,
+                                             I2C_CLIENT_END };
+
+        /* add atmel mxt touch device on PANEL GMBus */
+        ts = add_probed_i2c_device("touchscreen", I2C_ADAPTER_PANEL,
+                                   &atmel_1664s_device, addr_list);
+        return 0;
+}
+
+
+static int __init setup_isl29018_als(const struct dmi_system_id *id)
+{
+        /* add isl29018 light sensor */
+        als = add_smbus_device("lightsensor", &isl_als_device);
+        return 0;
+}
+
+static int __init setup_isl29023_als(const struct dmi_system_id *id)
+{
+        /* add isl29023 light sensor on Panel GMBus */
+        als = add_i2c_device("lightsensor", I2C_ADAPTER_PANEL,
+                             &isl_als_device);
+        return 0;
+}
+
+static int __init setup_tsl2583_als(const struct dmi_system_id *id)
+{
+        /* add tsl2583 light sensor on smbus */
+        als = add_smbus_device(NULL, &tsl2583_als_device);
+        return 0;
+}
+
+static int __init setup_tsl2563_als(const struct dmi_system_id *id)
+{
+        /* add tsl2563 light sensor on smbus */
+        als = add_smbus_device(NULL, &tsl2563_als_device);
+        return 0;
+}
+
+static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
+        {
+                .ident = "Samsung Series 5 550 - Touchpad",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
+                },
+                .callback = setup_cyapa_smbus_tp,
+        },
+        {
+                .ident = "Chromebook Pixel - Touchscreen",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
+                },
+                .callback = setup_atmel_1664s_ts,
+        },
+        {
+                .ident = "Chromebook Pixel - Touchpad",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
+                },
+                .callback = setup_atmel_224s_tp,
+        },
+        {
+                .ident = "Samsung Series 5 550 - Light Sensor",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
+                },
+                .callback = setup_isl29018_als,
+        },
+        {
+                .ident = "Chromebook Pixel - Light Sensor",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
+                },
+                .callback = setup_isl29023_als,
+        },
+        {
+                .ident = "Acer C7 Chromebook - Touchpad",
+                .matches = {
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
+                },
+                .callback = setup_cyapa_smbus_tp,
+        },
+        {
+                .ident = "HP Pavilion 14 Chromebook - Touchpad",
+                .matches = {
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
+                },
+                .callback = setup_cyapa_smbus_tp,
+        },
+        {
+                .ident = "Samsung Series 5 - Light Sensor",
+                .matches = {
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
+                },
+                .callback = setup_tsl2583_als,
+        },
+        {
+                .ident = "Cr-48 - Light Sensor",
+                .matches = {
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
+                },
+                .callback = setup_tsl2563_als,
+        },
+        {
+                .ident = "Acer AC700 - Light Sensor",
+                .matches = {
+                        DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
+                },
+                .callback = setup_tsl2563_als,
+        },
+        { }
+};
+MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
+
+static int __init chromeos_laptop_init(void)
+{
+        if (!dmi_check_system(chromeos_laptop_dmi_table)) {
+                pr_debug("%s unsupported system.\n", __func__);
+                return -ENODEV;
+        }
+        return 0;
+}
+
+static void __exit chromeos_laptop_exit(void)
+{
+        if (als)
+                i2c_unregister_device(als);
+        if (tp)
+                i2c_unregister_device(tp);
+        if (ts)
+                i2c_unregister_device(ts);
+}
+
+module_init(chromeos_laptop_init);
+module_exit(chromeos_laptop_exit);
+
+MODULE_DESCRIPTION("Chrome OS Laptop driver");
+MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
+MODULE_LICENSE("GPL");