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authorBenson Leung <bleung@chromium.org>2012-10-25 14:21:21 -0700
committerMatthew Garrett <matthew.garrett@nebula.com>2013-02-24 14:49:57 -0800
commitd1381f45ad54e0bb40ef19f99e87187ff3458bdb (patch)
treedb199e11fc1fb1f41144797aac59f803aea4ba65 /drivers/platform/x86
parent16a3d9f5aa1c9e0ecddd48bdfcf44445c9dbb601 (diff)
downloadlinux-linaro-stable-d1381f45ad54e0bb40ef19f99e87187ff3458bdb.tar.gz
Platform: x86: Add Chrome OS Laptop driver
This adds the chromeos_laptop driver. It supports the Cypress APA SMBUS touchpad as well as the isl29018 i2c ambient light sensor on the Samsung Series 5 550 Chromebook. Signed-off-by: Benson Leung <bleung@chromium.org> Reviewed-by: Olof Johansson <olof@lixom.net> Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r--drivers/platform/x86/Kconfig11
-rw-r--r--drivers/platform/x86/Makefile1
-rw-r--r--drivers/platform/x86/chromeos_laptop.c205
3 files changed, 217 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 7ab0b2fba503..585db6fa64b8 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -79,6 +79,17 @@ config ASUS_LAPTOP
If you have an ACPI-compatible ASUS laptop, say Y or M here.
+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.
+
config DELL_LAPTOP
tristate "Dell Laptop Extras"
depends on X86
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index bf7e4f935b17..ace2b38942fe 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -50,3 +50,4 @@ obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o
obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o
obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o
obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o
+obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
diff --git a/drivers/platform/x86/chromeos_laptop.c b/drivers/platform/x86/chromeos_laptop.c
new file mode 100644
index 000000000000..a8329c3a9d0d
--- /dev/null
+++ b/drivers/platform/x86/chromeos_laptop.c
@@ -0,0 +1,205 @@
+/*
+ * 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/module.h>
+
+#define CYAPA_TP_I2C_ADDR 0x67
+#define ISL_ALS_I2C_ADDR 0x44
+
+static struct i2c_client *als;
+static struct i2c_client *tp;
+
+const char *i2c_adapter_names[] = {
+ "SMBus I801 adapter",
+};
+
+/* Keep this enum consistent with i2c_adapter_names */
+enum i2c_adapter_type {
+ I2C_ADAPTER_SMBUS = 0,
+};
+
+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_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;
+}
+
+/*
+ * Probes for a device at a single address, the one provided by
+ * info->addr.
+ * Returns NULL if no device found.
+ */
+static struct i2c_client __init *add_smbus_device(const char *name,
+ 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(I2C_ADAPTER_SMBUS),
+ info,
+ addr_list);
+}
+
+static int __init setup_lumpy_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_isl29018_als(const struct dmi_system_id *id)
+{
+ /* add isl29018 light sensor */
+ als = add_smbus_device("lightsensor", &isl_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_lumpy_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,
+ },
+ { }
+};
+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);
+}
+
+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");