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>
This commit is contained in:
Benson Leung
Matthew Garrett
parent
16a3d9f5aa
commit
d1381f45ad
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@ -79,6 +79,17 @@ config ASUS_LAPTOP
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If you have an ACPI-compatible ASUS laptop, say Y or M here.
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config CHROMEOS_LAPTOP
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tristate "Chrome OS Laptop"
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depends on I2C
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depends on DMI
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---help---
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This driver instantiates i2c and smbus devices such as
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light sensors and touchpads.
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If you have a supported Chromebook, choose Y or M here.
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The module will be called chromeos_laptop.
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config DELL_LAPTOP
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tristate "Dell Laptop Extras"
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depends on X86
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@ -50,3 +50,4 @@ obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o
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obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o
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obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o
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obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o
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obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
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205
drivers/platform/x86/chromeos_laptop.c
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205
drivers/platform/x86/chromeos_laptop.c
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@ -0,0 +1,205 @@
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/*
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* chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
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*
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* Author : Benson Leung <bleung@chromium.org>
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*
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* Copyright (C) 2012 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/dmi.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#define CYAPA_TP_I2C_ADDR 0x67
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#define ISL_ALS_I2C_ADDR 0x44
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static struct i2c_client *als;
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static struct i2c_client *tp;
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const char *i2c_adapter_names[] = {
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"SMBus I801 adapter",
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};
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/* Keep this enum consistent with i2c_adapter_names */
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enum i2c_adapter_type {
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I2C_ADAPTER_SMBUS = 0,
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};
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static struct i2c_board_info __initdata cyapa_device = {
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I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
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.flags = I2C_CLIENT_WAKE,
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};
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static struct i2c_board_info __initdata isl_als_device = {
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I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
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};
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static struct i2c_client __init *__add_probed_i2c_device(
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const char *name,
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int bus,
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struct i2c_board_info *info,
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const unsigned short *addrs)
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{
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const struct dmi_device *dmi_dev;
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const struct dmi_dev_onboard *dev_data;
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struct i2c_adapter *adapter;
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struct i2c_client *client;
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if (bus < 0)
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return NULL;
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/*
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* If a name is specified, look for irq platform information stashed
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* in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
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*/
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if (name) {
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dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
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if (!dmi_dev) {
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pr_err("%s failed to dmi find device %s.\n",
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__func__,
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name);
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return NULL;
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}
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dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
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if (!dev_data) {
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pr_err("%s failed to get data from dmi for %s.\n",
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__func__, name);
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return NULL;
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}
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info->irq = dev_data->instance;
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}
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adapter = i2c_get_adapter(bus);
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if (!adapter) {
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pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
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return NULL;
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}
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/* add the i2c device */
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client = i2c_new_probed_device(adapter, info, addrs, NULL);
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if (!client)
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pr_err("%s failed to register device %d-%02x\n",
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__func__, bus, info->addr);
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else
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pr_debug("%s added i2c device %d-%02x\n",
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__func__, bus, info->addr);
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i2c_put_adapter(adapter);
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return client;
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}
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static int __init __find_i2c_adap(struct device *dev, void *data)
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{
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const char *name = data;
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static const char *prefix = "i2c-";
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struct i2c_adapter *adapter;
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if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
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return 0;
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adapter = to_i2c_adapter(dev);
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return (strncmp(adapter->name, name, strlen(name)) == 0);
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}
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static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
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{
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struct device *dev = NULL;
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struct i2c_adapter *adapter;
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const char *name = i2c_adapter_names[type];
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/* find the adapter by name */
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dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
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__find_i2c_adap);
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if (!dev) {
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pr_err("%s: i2c adapter %s not found on system.\n", __func__,
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name);
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return -ENODEV;
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}
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adapter = to_i2c_adapter(dev);
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return adapter->nr;
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}
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/*
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* Probes for a device at a single address, the one provided by
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* info->addr.
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* Returns NULL if no device found.
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*/
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static struct i2c_client __init *add_smbus_device(const char *name,
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struct i2c_board_info *info)
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{
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const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
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return __add_probed_i2c_device(name,
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find_i2c_adapter_num(I2C_ADAPTER_SMBUS),
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info,
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addr_list);
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}
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static int __init setup_lumpy_tp(const struct dmi_system_id *id)
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{
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/* add cyapa touchpad on smbus */
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tp = add_smbus_device("trackpad", &cyapa_device);
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return 0;
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}
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static int __init setup_isl29018_als(const struct dmi_system_id *id)
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{
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/* add isl29018 light sensor */
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als = add_smbus_device("lightsensor", &isl_als_device);
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return 0;
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}
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static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
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{
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.ident = "Samsung Series 5 550 - Touchpad",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
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},
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.callback = setup_lumpy_tp,
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},
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{
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.ident = "Samsung Series 5 550 - Light Sensor",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
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},
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.callback = setup_isl29018_als,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
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static int __init chromeos_laptop_init(void)
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{
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if (!dmi_check_system(chromeos_laptop_dmi_table)) {
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pr_debug("%s unsupported system.\n", __func__);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit chromeos_laptop_exit(void)
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{
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if (als)
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i2c_unregister_device(als);
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if (tp)
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i2c_unregister_device(tp);
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}
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module_init(chromeos_laptop_init);
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module_exit(chromeos_laptop_exit);
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MODULE_DESCRIPTION("Chrome OS Laptop driver");
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MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
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MODULE_LICENSE("GPL");
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