668 lines
16 KiB
C
668 lines
16 KiB
C
/*
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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/platform_data/atmel_mxt_ts.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#define ATMEL_TP_I2C_ADDR 0x4b
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#define ATMEL_TP_I2C_BL_ADDR 0x25
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#define ATMEL_TS_I2C_ADDR 0x4a
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#define ATMEL_TS_I2C_BL_ADDR 0x26
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#define CYAPA_TP_I2C_ADDR 0x67
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#define ELAN_TP_I2C_ADDR 0x15
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#define ISL_ALS_I2C_ADDR 0x44
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#define TAOS_ALS_I2C_ADDR 0x29
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#define MAX_I2C_DEVICE_DEFERRALS 5
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static struct i2c_client *als;
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static struct i2c_client *tp;
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static struct i2c_client *ts;
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static const char *i2c_adapter_names[] = {
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"SMBus I801 adapter",
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"i915 gmbus vga",
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"i915 gmbus panel",
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"Synopsys DesignWare I2C adapter",
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"Synopsys DesignWare I2C 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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I2C_ADAPTER_VGADDC,
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I2C_ADAPTER_PANEL,
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I2C_ADAPTER_DESIGNWARE_0,
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I2C_ADAPTER_DESIGNWARE_1,
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};
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enum i2c_peripheral_state {
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UNPROBED = 0,
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PROBED,
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TIMEDOUT,
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};
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struct i2c_peripheral {
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int (*add)(enum i2c_adapter_type type);
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enum i2c_adapter_type type;
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enum i2c_peripheral_state state;
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int tries;
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};
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#define MAX_I2C_PERIPHERALS 4
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struct chromeos_laptop {
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struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
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};
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static struct chromeos_laptop *cros_laptop;
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static struct i2c_board_info 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 elantech_device = {
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I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
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.flags = I2C_CLIENT_WAKE,
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};
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static struct i2c_board_info 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_board_info tsl2583_als_device = {
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I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
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};
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static struct i2c_board_info tsl2563_als_device = {
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I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
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};
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static int mxt_t19_keys[] = {
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_RESERVED,
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BTN_LEFT
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};
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static struct mxt_platform_data atmel_224s_tp_platform_data = {
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.irqflags = IRQF_TRIGGER_FALLING,
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.t19_num_keys = ARRAY_SIZE(mxt_t19_keys),
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.t19_keymap = mxt_t19_keys,
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.suspend_mode = MXT_SUSPEND_T9_CTRL,
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};
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static struct i2c_board_info atmel_224s_tp_device = {
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I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
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.platform_data = &atmel_224s_tp_platform_data,
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.flags = I2C_CLIENT_WAKE,
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};
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static struct mxt_platform_data atmel_1664s_platform_data = {
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.irqflags = IRQF_TRIGGER_FALLING,
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.suspend_mode = MXT_SUSPEND_T9_CTRL,
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};
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static struct i2c_board_info atmel_1664s_device = {
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I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
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.platform_data = &atmel_1664s_platform_data,
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.flags = I2C_CLIENT_WAKE,
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};
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static struct i2c_client *__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 *alt_addr_list)
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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 = NULL;
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const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
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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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/*
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* Add the i2c device. If we can't detect it at the primary
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* address we scan secondary addresses. In any case the client
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* structure gets assigned primary address.
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*/
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client = i2c_new_probed_device(adapter, info, addr_list, NULL);
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if (!client && alt_addr_list) {
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struct i2c_board_info dummy_info = {
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I2C_BOARD_INFO("dummy", info->addr),
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};
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struct i2c_client *dummy;
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dummy = i2c_new_probed_device(adapter, &dummy_info,
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alt_addr_list, NULL);
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if (dummy) {
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pr_debug("%s %d-%02x is probed at %02x\n",
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__func__, bus, info->addr, dummy->addr);
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i2c_unregister_device(dummy);
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client = i2c_new_device(adapter, info);
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}
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}
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if (!client)
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pr_notice("%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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struct i2c_lookup {
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const char *name;
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int instance;
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int n;
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};
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static int __find_i2c_adap(struct device *dev, void *data)
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{
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struct i2c_lookup *lookup = 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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if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
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lookup->n++ == lookup->instance)
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return 1;
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return 0;
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}
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static int 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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struct i2c_lookup lookup;
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memset(&lookup, 0, sizeof(lookup));
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lookup.name = i2c_adapter_names[type];
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lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
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/* find the adapter by name */
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dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
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if (!dev) {
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/* Adapters may appear later. Deferred probing will retry */
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pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
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lookup.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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* Takes a list of addresses in addrs as such :
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* { addr1, ... , addrn, I2C_CLIENT_END };
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* add_probed_i2c_device will use i2c_new_probed_device
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* and probe for devices at all of the addresses listed.
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* Returns NULL if no devices found.
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* See Documentation/i2c/instantiating-devices for more information.
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*/
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static struct i2c_client *add_probed_i2c_device(
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const char *name,
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enum i2c_adapter_type type,
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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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return __add_probed_i2c_device(name,
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find_i2c_adapter_num(type),
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info,
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addrs);
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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 *add_i2c_device(const char *name,
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enum i2c_adapter_type type,
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struct i2c_board_info *info)
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{
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return __add_probed_i2c_device(name,
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find_i2c_adapter_num(type),
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info,
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NULL);
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}
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static int setup_cyapa_tp(enum i2c_adapter_type type)
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{
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if (tp)
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return 0;
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/* add cyapa touchpad */
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tp = add_i2c_device("trackpad", type, &cyapa_device);
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return (!tp) ? -EAGAIN : 0;
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}
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static int setup_atmel_224s_tp(enum i2c_adapter_type type)
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{
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const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
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I2C_CLIENT_END };
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if (tp)
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return 0;
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/* add atmel mxt touchpad */
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tp = add_probed_i2c_device("trackpad", type,
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&atmel_224s_tp_device, addr_list);
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return (!tp) ? -EAGAIN : 0;
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}
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static int setup_elantech_tp(enum i2c_adapter_type type)
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{
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if (tp)
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return 0;
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/* add elantech touchpad */
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tp = add_i2c_device("trackpad", type, &elantech_device);
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return (!tp) ? -EAGAIN : 0;
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}
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static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
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{
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const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
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I2C_CLIENT_END };
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if (ts)
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return 0;
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/* add atmel mxt touch device */
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ts = add_probed_i2c_device("touchscreen", type,
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&atmel_1664s_device, addr_list);
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return (!ts) ? -EAGAIN : 0;
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}
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static int setup_isl29018_als(enum i2c_adapter_type type)
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{
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if (als)
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return 0;
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/* add isl29018 light sensor */
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als = add_i2c_device("lightsensor", type, &isl_als_device);
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return (!als) ? -EAGAIN : 0;
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}
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static int setup_tsl2583_als(enum i2c_adapter_type type)
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{
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if (als)
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return 0;
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/* add tsl2583 light sensor */
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als = add_i2c_device(NULL, type, &tsl2583_als_device);
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return (!als) ? -EAGAIN : 0;
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}
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static int setup_tsl2563_als(enum i2c_adapter_type type)
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{
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if (als)
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return 0;
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/* add tsl2563 light sensor */
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als = add_i2c_device(NULL, type, &tsl2563_als_device);
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return (!als) ? -EAGAIN : 0;
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}
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static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
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{
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cros_laptop = (void *)id->driver_data;
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pr_debug("DMI Matched %s.\n", id->ident);
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/* Indicate to dmi_scan that processing is done. */
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return 1;
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}
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static int chromeos_laptop_probe(struct platform_device *pdev)
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{
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int i;
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int ret = 0;
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for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
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struct i2c_peripheral *i2c_dev;
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i2c_dev = &cros_laptop->i2c_peripherals[i];
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/* No more peripherals. */
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if (i2c_dev->add == NULL)
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break;
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if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
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continue;
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/*
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* Check that the i2c adapter is present.
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* -EPROBE_DEFER if missing as the adapter may appear much
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* later.
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*/
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if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
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ret = -EPROBE_DEFER;
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continue;
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}
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/* Add the device. */
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if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
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/*
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* Set -EPROBE_DEFER a limited num of times
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* if device is not successfully added.
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*/
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if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
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ret = -EPROBE_DEFER;
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} else {
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/* Ran out of tries. */
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pr_notice("%s: Ran out of tries for device.\n",
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__func__);
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i2c_dev->state = TIMEDOUT;
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}
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} else {
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i2c_dev->state = PROBED;
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}
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}
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return ret;
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}
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static struct chromeos_laptop samsung_series_5_550 = {
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.i2c_peripherals = {
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/* Touchpad. */
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{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
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/* Light Sensor. */
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{ .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
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},
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};
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static struct chromeos_laptop samsung_series_5 = {
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.i2c_peripherals = {
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/* Light Sensor. */
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{ .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
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},
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};
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static struct chromeos_laptop chromebook_pixel = {
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.i2c_peripherals = {
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/* Touch Screen. */
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{ .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
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/* Touchpad. */
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{ .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
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/* Light Sensor. */
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{ .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
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},
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};
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static struct chromeos_laptop hp_chromebook_14 = {
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.i2c_peripherals = {
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/* Touchpad. */
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{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
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},
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};
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static struct chromeos_laptop dell_chromebook_11 = {
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.i2c_peripherals = {
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/* Touchpad. */
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{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
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/* Elan Touchpad option. */
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{ .add = setup_elantech_tp, I2C_ADAPTER_DESIGNWARE_0 },
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},
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};
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static struct chromeos_laptop toshiba_cb35 = {
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.i2c_peripherals = {
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/* Touchpad. */
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{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
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},
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};
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static struct chromeos_laptop acer_c7_chromebook = {
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.i2c_peripherals = {
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/* Touchpad. */
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{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
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},
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};
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static struct chromeos_laptop acer_ac700 = {
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.i2c_peripherals = {
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/* Light Sensor. */
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{ .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
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},
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};
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static struct chromeos_laptop acer_c720 = {
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.i2c_peripherals = {
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/* Touchscreen. */
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{ .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
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/* Touchpad. */
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{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
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/* Elan Touchpad option. */
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{ .add = setup_elantech_tp, I2C_ADAPTER_DESIGNWARE_0 },
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/* Light Sensor. */
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{ .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
|
|
},
|
|
};
|
|
|
|
static struct chromeos_laptop hp_pavilion_14_chromebook = {
|
|
.i2c_peripherals = {
|
|
/* Touchpad. */
|
|
{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
|
|
},
|
|
};
|
|
|
|
static struct chromeos_laptop cr48 = {
|
|
.i2c_peripherals = {
|
|
/* Light Sensor. */
|
|
{ .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
|
|
},
|
|
};
|
|
|
|
#define _CBDD(board_) \
|
|
.callback = chromeos_laptop_dmi_matched, \
|
|
.driver_data = (void *)&board_
|
|
|
|
static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
|
|
{
|
|
.ident = "Samsung Series 5 550",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
|
|
},
|
|
_CBDD(samsung_series_5_550),
|
|
},
|
|
{
|
|
.ident = "Samsung Series 5",
|
|
.matches = {
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
|
|
},
|
|
_CBDD(samsung_series_5),
|
|
},
|
|
{
|
|
.ident = "Chromebook Pixel",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
|
|
},
|
|
_CBDD(chromebook_pixel),
|
|
},
|
|
{
|
|
.ident = "Wolf",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
|
|
},
|
|
_CBDD(dell_chromebook_11),
|
|
},
|
|
{
|
|
.ident = "HP Chromebook 14",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
|
|
},
|
|
_CBDD(hp_chromebook_14),
|
|
},
|
|
{
|
|
.ident = "Toshiba CB35",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
|
|
},
|
|
_CBDD(toshiba_cb35),
|
|
},
|
|
{
|
|
.ident = "Acer C7 Chromebook",
|
|
.matches = {
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
|
|
},
|
|
_CBDD(acer_c7_chromebook),
|
|
},
|
|
{
|
|
.ident = "Acer AC700",
|
|
.matches = {
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
|
|
},
|
|
_CBDD(acer_ac700),
|
|
},
|
|
{
|
|
.ident = "Acer C720",
|
|
.matches = {
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
|
|
},
|
|
_CBDD(acer_c720),
|
|
},
|
|
{
|
|
.ident = "HP Pavilion 14 Chromebook",
|
|
.matches = {
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
|
|
},
|
|
_CBDD(hp_pavilion_14_chromebook),
|
|
},
|
|
{
|
|
.ident = "Cr-48",
|
|
.matches = {
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
|
|
},
|
|
_CBDD(cr48),
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
|
|
|
|
static struct platform_device *cros_platform_device;
|
|
|
|
static struct platform_driver cros_platform_driver = {
|
|
.driver = {
|
|
.name = "chromeos_laptop",
|
|
},
|
|
.probe = chromeos_laptop_probe,
|
|
};
|
|
|
|
static int __init chromeos_laptop_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!dmi_check_system(chromeos_laptop_dmi_table)) {
|
|
pr_debug("%s unsupported system.\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = platform_driver_register(&cros_platform_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
|
|
if (!cros_platform_device) {
|
|
ret = -ENOMEM;
|
|
goto fail_platform_device1;
|
|
}
|
|
|
|
ret = platform_device_add(cros_platform_device);
|
|
if (ret)
|
|
goto fail_platform_device2;
|
|
|
|
return 0;
|
|
|
|
fail_platform_device2:
|
|
platform_device_put(cros_platform_device);
|
|
fail_platform_device1:
|
|
platform_driver_unregister(&cros_platform_driver);
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
|
|
platform_device_unregister(cros_platform_device);
|
|
platform_driver_unregister(&cros_platform_driver);
|
|
}
|
|
|
|
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");
|