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path: root/kernel/drivers/platform/chrome/chromeos_laptop.c
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Diffstat (limited to 'kernel/drivers/platform/chrome/chromeos_laptop.c')
-rw-r--r--kernel/drivers/platform/chrome/chromeos_laptop.c645
1 files changed, 645 insertions, 0 deletions
diff --git a/kernel/drivers/platform/chrome/chromeos_laptop.c b/kernel/drivers/platform/chrome/chromeos_laptop.c
new file mode 100644
index 000000000..a04019ab9
--- /dev/null
+++ b/kernel/drivers/platform/chrome/chromeos_laptop.c
@@ -0,0 +1,645 @@
+/*
+ * 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>
+#include <linux/platform_device.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
+
+#define MAX_I2C_DEVICE_DEFERRALS 5
+
+static struct i2c_client *als;
+static struct i2c_client *tp;
+static struct i2c_client *ts;
+
+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 */
+enum i2c_adapter_type {
+ I2C_ADAPTER_SMBUS = 0,
+ I2C_ADAPTER_VGADDC,
+ I2C_ADAPTER_PANEL,
+ I2C_ADAPTER_DESIGNWARE_0,
+ I2C_ADAPTER_DESIGNWARE_1,
+};
+
+enum i2c_peripheral_state {
+ UNPROBED = 0,
+ PROBED,
+ TIMEDOUT,
+};
+
+struct i2c_peripheral {
+ int (*add)(enum i2c_adapter_type type);
+ enum i2c_adapter_type type;
+ enum i2c_peripheral_state state;
+ int tries;
+};
+
+#define MAX_I2C_PERIPHERALS 3
+
+struct chromeos_laptop {
+ struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
+};
+
+static struct chromeos_laptop *cros_laptop;
+
+static struct i2c_board_info cyapa_device = {
+ I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
+ .flags = I2C_CLIENT_WAKE,
+};
+
+static struct i2c_board_info isl_als_device = {
+ I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
+};
+
+static struct i2c_board_info tsl2583_als_device = {
+ I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
+};
+
+static struct i2c_board_info tsl2563_als_device = {
+ I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
+};
+
+static int mxt_t19_keys[] = {
+ KEY_RESERVED,
+ KEY_RESERVED,
+ KEY_RESERVED,
+ KEY_RESERVED,
+ KEY_RESERVED,
+ BTN_LEFT
+};
+
+static struct mxt_platform_data atmel_224s_tp_platform_data = {
+ .irqflags = IRQF_TRIGGER_FALLING,
+ .t19_num_keys = ARRAY_SIZE(mxt_t19_keys),
+ .t19_keymap = mxt_t19_keys,
+};
+
+static struct i2c_board_info 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 = {
+ .irqflags = IRQF_TRIGGER_FALLING,
+};
+
+static struct i2c_board_info 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 *__add_probed_i2c_device(
+ const char *name,
+ int bus,
+ struct i2c_board_info *info,
+ const unsigned short *alt_addr_list)
+{
+ const struct dmi_device *dmi_dev;
+ const struct dmi_dev_onboard *dev_data;
+ struct i2c_adapter *adapter;
+ struct i2c_client *client = NULL;
+ const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
+
+ 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. If we can't detect it at the primary
+ * address we scan secondary addresses. In any case the client
+ * structure gets assigned primary address.
+ */
+ client = i2c_new_probed_device(adapter, info, addr_list, NULL);
+ if (!client && alt_addr_list) {
+ struct i2c_board_info dummy_info = {
+ I2C_BOARD_INFO("dummy", info->addr),
+ };
+ struct i2c_client *dummy;
+
+ dummy = i2c_new_probed_device(adapter, &dummy_info,
+ alt_addr_list, NULL);
+ if (dummy) {
+ pr_debug("%s %d-%02x is probed at %02x\n",
+ __func__, bus, info->addr, dummy->addr);
+ i2c_unregister_device(dummy);
+ client = i2c_new_device(adapter, info);
+ }
+ }
+
+ if (!client)
+ pr_notice("%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;
+}
+
+struct i2c_lookup {
+ const char *name;
+ int instance;
+ int n;
+};
+
+static int __find_i2c_adap(struct device *dev, void *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);
+ 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;
+ 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, &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__,
+ lookup.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 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 struct i2c_client *add_i2c_device(const char *name,
+ enum i2c_adapter_type type,
+ struct i2c_board_info *info)
+{
+ return __add_probed_i2c_device(name,
+ find_i2c_adapter_num(type),
+ info,
+ NULL);
+}
+
+static int setup_cyapa_tp(enum i2c_adapter_type type)
+{
+ if (tp)
+ return 0;
+
+ /* add cyapa touchpad */
+ tp = add_i2c_device("trackpad", type, &cyapa_device);
+ return (!tp) ? -EAGAIN : 0;
+}
+
+static int setup_atmel_224s_tp(enum i2c_adapter_type type)
+{
+ const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
+ I2C_CLIENT_END };
+ if (tp)
+ return 0;
+
+ /* add atmel mxt touchpad */
+ tp = add_probed_i2c_device("trackpad", type,
+ &atmel_224s_tp_device, addr_list);
+ return (!tp) ? -EAGAIN : 0;
+}
+
+static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
+{
+ const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
+ I2C_CLIENT_END };
+ if (ts)
+ return 0;
+
+ /* add atmel mxt touch device */
+ ts = add_probed_i2c_device("touchscreen", type,
+ &atmel_1664s_device, addr_list);
+ return (!ts) ? -EAGAIN : 0;
+}
+
+static int setup_isl29018_als(enum i2c_adapter_type type)
+{
+ if (als)
+ return 0;
+
+ /* add isl29018 light sensor */
+ als = add_i2c_device("lightsensor", type, &isl_als_device);
+ return (!als) ? -EAGAIN : 0;
+}
+
+static int setup_tsl2583_als(enum i2c_adapter_type type)
+{
+ if (als)
+ return 0;
+
+ /* add tsl2583 light sensor */
+ als = add_i2c_device(NULL, type, &tsl2583_als_device);
+ return (!als) ? -EAGAIN : 0;
+}
+
+static int setup_tsl2563_als(enum i2c_adapter_type type)
+{
+ if (als)
+ return 0;
+
+ /* add tsl2563 light sensor */
+ als = add_i2c_device(NULL, type, &tsl2563_als_device);
+ return (!als) ? -EAGAIN : 0;
+}
+
+static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
+{
+ cros_laptop = (void *)id->driver_data;
+ pr_debug("DMI Matched %s.\n", id->ident);
+
+ /* Indicate to dmi_scan that processing is done. */
+ return 1;
+}
+
+static int chromeos_laptop_probe(struct platform_device *pdev)
+{
+ int i;
+ int ret = 0;
+
+ for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
+ struct i2c_peripheral *i2c_dev;
+
+ i2c_dev = &cros_laptop->i2c_peripherals[i];
+
+ /* No more peripherals. */
+ if (i2c_dev->add == NULL)
+ break;
+
+ if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
+ continue;
+
+ /*
+ * Check that the i2c adapter is present.
+ * -EPROBE_DEFER if missing as the adapter may appear much
+ * later.
+ */
+ if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
+ ret = -EPROBE_DEFER;
+ continue;
+ }
+
+ /* Add the device. */
+ if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
+ /*
+ * Set -EPROBE_DEFER a limited num of times
+ * if device is not successfully added.
+ */
+ if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
+ ret = -EPROBE_DEFER;
+ } else {
+ /* Ran out of tries. */
+ pr_notice("%s: Ran out of tries for device.\n",
+ __func__);
+ i2c_dev->state = TIMEDOUT;
+ }
+ } else {
+ i2c_dev->state = PROBED;
+ }
+ }
+
+ return ret;
+}
+
+static struct chromeos_laptop samsung_series_5_550 = {
+ .i2c_peripherals = {
+ /* Touchpad. */
+ { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
+ /* Light Sensor. */
+ { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
+ },
+};
+
+static struct chromeos_laptop samsung_series_5 = {
+ .i2c_peripherals = {
+ /* Light Sensor. */
+ { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
+ },
+};
+
+static struct chromeos_laptop chromebook_pixel = {
+ .i2c_peripherals = {
+ /* Touch Screen. */
+ { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
+ /* Touchpad. */
+ { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
+ /* Light Sensor. */
+ { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
+ },
+};
+
+static struct chromeos_laptop hp_chromebook_14 = {
+ .i2c_peripherals = {
+ /* Touchpad. */
+ { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
+ },
+};
+
+static struct chromeos_laptop dell_chromebook_11 = {
+ .i2c_peripherals = {
+ /* Touchpad. */
+ { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
+ },
+};
+
+static struct chromeos_laptop toshiba_cb35 = {
+ .i2c_peripherals = {
+ /* Touchpad. */
+ { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
+ },
+};
+
+static struct chromeos_laptop acer_c7_chromebook = {
+ .i2c_peripherals = {
+ /* Touchpad. */
+ { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
+ },
+};
+
+static struct chromeos_laptop acer_ac700 = {
+ .i2c_peripherals = {
+ /* Light Sensor. */
+ { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
+ },
+};
+
+static struct chromeos_laptop acer_c720 = {
+ .i2c_peripherals = {
+ /* Touchscreen. */
+ { .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
+ /* 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. */
+ { .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");