diff options
Diffstat (limited to 'kernel/drivers/platform/chrome')
| -rw-r--r-- | kernel/drivers/platform/chrome/Kconfig | 62 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/Makefile | 6 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/chromeos_laptop.c | 645 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/chromeos_pstore.c | 91 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_dev.c | 274 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_dev.h | 53 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_lightbar.c | 367 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_lpc.c | 319 | ||||
| -rw-r--r-- | kernel/drivers/platform/chrome/cros_ec_sysfs.c | 271 |
9 files changed, 2088 insertions, 0 deletions
diff --git a/kernel/drivers/platform/chrome/Kconfig b/kernel/drivers/platform/chrome/Kconfig new file mode 100644 index 000000000..2a6531a5f --- /dev/null +++ b/kernel/drivers/platform/chrome/Kconfig @@ -0,0 +1,62 @@ +# +# Platform support for Chrome OS hardware (Chromebooks and Chromeboxes) +# + +menuconfig CHROME_PLATFORMS + bool "Platform support for Chrome hardware" + depends on X86 || ARM + ---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 && DMI && X86 + ---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 CHROMEOS_PSTORE + tristate "Chrome OS pstore support" + depends on X86 + ---help--- + This module instantiates the persistent storage on x86 ChromeOS + devices. It can be used to store away console logs and crash + information across reboots. + + The range of memory used is 0xf00000-0x1000000, traditionally + the memory used to back VGA controller memory. + + If you have a supported Chromebook, choose Y or M here. + The module will be called chromeos_pstore. + +config CROS_EC_CHARDEV + tristate "Chrome OS Embedded Controller userspace device interface" + depends on MFD_CROS_EC + ---help--- + This driver adds support to talk with the ChromeOS EC from userspace. + + If you have a supported Chromebook, choose Y or M here. + The module will be called cros_ec_dev. + +config CROS_EC_LPC + tristate "ChromeOS Embedded Controller (LPC)" + depends on MFD_CROS_EC && (X86 || COMPILE_TEST) + help + If you say Y here, you get support for talking to the ChromeOS EC + over an LPC bus. This uses a simple byte-level protocol with a + checksum. This is used for userspace access only. The kernel + typically has its own communication methods. + + To compile this driver as a module, choose M here: the + module will be called cros_ec_lpc. + +endif # CHROMEOS_PLATFORMS diff --git a/kernel/drivers/platform/chrome/Makefile b/kernel/drivers/platform/chrome/Makefile new file mode 100644 index 000000000..bd8d8601e --- /dev/null +++ b/kernel/drivers/platform/chrome/Makefile @@ -0,0 +1,6 @@ + +obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o +obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o +cros_ec_devs-objs := cros_ec_dev.o cros_ec_sysfs.o cros_ec_lightbar.o +obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_devs.o +obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpc.o 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"); diff --git a/kernel/drivers/platform/chrome/chromeos_pstore.c b/kernel/drivers/platform/chrome/chromeos_pstore.c new file mode 100644 index 000000000..34749200e --- /dev/null +++ b/kernel/drivers/platform/chrome/chromeos_pstore.c @@ -0,0 +1,91 @@ +/* + * chromeos_pstore.c - Driver to instantiate Chromebook ramoops device + * + * Copyright (C) 2013 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, version 2 of the License. + */ + +#include <linux/dmi.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pstore_ram.h> + +static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = { + { + /* + * Today all Chromebooks/boxes ship with Google_* as version and + * coreboot as bios vendor. No other systems with this + * combination are known to date. + */ + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_BIOS_VERSION, "Google_"), + }, + }, + { + /* x86-alex, the first Samsung Chromebook. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "Alex"), + }, + }, + { + /* x86-mario, the Cr-48 pilot device from Google. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "IEC"), + DMI_MATCH(DMI_PRODUCT_NAME, "Mario"), + }, + }, + { + /* x86-zgb, the first Acer Chromebook. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ACER"), + DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), + }, + }, + { } +}; +MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table); + +/* + * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory + * range untouched across reboots, so we use that to store our pstore + * contents for panic logs, etc. + */ +static struct ramoops_platform_data chromeos_ramoops_data = { + .mem_size = 0x100000, + .mem_address = 0xf00000, + .record_size = 0x20000, + .console_size = 0x20000, + .ftrace_size = 0x20000, + .dump_oops = 1, +}; + +static struct platform_device chromeos_ramoops = { + .name = "ramoops", + .dev = { + .platform_data = &chromeos_ramoops_data, + }, +}; + +static int __init chromeos_pstore_init(void) +{ + if (dmi_check_system(chromeos_pstore_dmi_table)) + return platform_device_register(&chromeos_ramoops); + + return -ENODEV; +} + +static void __exit chromeos_pstore_exit(void) +{ + platform_device_unregister(&chromeos_ramoops); +} + +module_init(chromeos_pstore_init); +module_exit(chromeos_pstore_exit); + +MODULE_DESCRIPTION("Chrome OS pstore module"); +MODULE_LICENSE("GPL"); diff --git a/kernel/drivers/platform/chrome/cros_ec_dev.c b/kernel/drivers/platform/chrome/cros_ec_dev.c new file mode 100644 index 000000000..6090d0b28 --- /dev/null +++ b/kernel/drivers/platform/chrome/cros_ec_dev.c @@ -0,0 +1,274 @@ +/* + * cros_ec_dev - expose the Chrome OS Embedded Controller to user-space + * + * Copyright (C) 2014 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, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/uaccess.h> + +#include "cros_ec_dev.h" + +/* Device variables */ +#define CROS_MAX_DEV 128 +static struct class *cros_class; +static int ec_major; + +/* Basic communication */ +static int ec_get_version(struct cros_ec_device *ec, char *str, int maxlen) +{ + struct ec_response_get_version *resp; + static const char * const current_image_name[] = { + "unknown", "read-only", "read-write", "invalid", + }; + struct cros_ec_command msg = { + .version = 0, + .command = EC_CMD_GET_VERSION, + .outdata = { 0 }, + .outsize = 0, + .indata = { 0 }, + .insize = sizeof(*resp), + }; + int ret; + + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + + if (msg.result != EC_RES_SUCCESS) { + snprintf(str, maxlen, + "%s\nUnknown EC version: EC returned %d\n", + CROS_EC_DEV_VERSION, msg.result); + return 0; + } + + resp = (struct ec_response_get_version *)msg.indata; + if (resp->current_image >= ARRAY_SIZE(current_image_name)) + resp->current_image = 3; /* invalid */ + + snprintf(str, maxlen, "%s\n%s\n%s\n%s\n", CROS_EC_DEV_VERSION, + resp->version_string_ro, resp->version_string_rw, + current_image_name[resp->current_image]); + + return 0; +} + +/* Device file ops */ +static int ec_device_open(struct inode *inode, struct file *filp) +{ + filp->private_data = container_of(inode->i_cdev, + struct cros_ec_device, cdev); + return 0; +} + +static int ec_device_release(struct inode *inode, struct file *filp) +{ + return 0; +} + +static ssize_t ec_device_read(struct file *filp, char __user *buffer, + size_t length, loff_t *offset) +{ + struct cros_ec_device *ec = filp->private_data; + char msg[sizeof(struct ec_response_get_version) + + sizeof(CROS_EC_DEV_VERSION)]; + size_t count; + int ret; + + if (*offset != 0) + return 0; + + ret = ec_get_version(ec, msg, sizeof(msg)); + if (ret) + return ret; + + count = min(length, strlen(msg)); + + if (copy_to_user(buffer, msg, count)) + return -EFAULT; + + *offset = count; + return count; +} + +/* Ioctls */ +static long ec_device_ioctl_xcmd(struct cros_ec_device *ec, void __user *arg) +{ + long ret; + struct cros_ec_command s_cmd = { }; + + if (copy_from_user(&s_cmd, arg, sizeof(s_cmd))) + return -EFAULT; + + ret = cros_ec_cmd_xfer(ec, &s_cmd); + /* Only copy data to userland if data was received. */ + if (ret < 0) + return ret; + + if (copy_to_user(arg, &s_cmd, sizeof(s_cmd))) + return -EFAULT; + + return 0; +} + +static long ec_device_ioctl_readmem(struct cros_ec_device *ec, void __user *arg) +{ + struct cros_ec_readmem s_mem = { }; + long num; + + /* Not every platform supports direct reads */ + if (!ec->cmd_readmem) + return -ENOTTY; + + if (copy_from_user(&s_mem, arg, sizeof(s_mem))) + return -EFAULT; + + num = ec->cmd_readmem(ec, s_mem.offset, s_mem.bytes, s_mem.buffer); + if (num <= 0) + return num; + + if (copy_to_user((void __user *)arg, &s_mem, sizeof(s_mem))) + return -EFAULT; + + return 0; +} + +static long ec_device_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct cros_ec_device *ec = filp->private_data; + + if (_IOC_TYPE(cmd) != CROS_EC_DEV_IOC) + return -ENOTTY; + + switch (cmd) { + case CROS_EC_DEV_IOCXCMD: + return ec_device_ioctl_xcmd(ec, (void __user *)arg); + case CROS_EC_DEV_IOCRDMEM: + return ec_device_ioctl_readmem(ec, (void __user *)arg); + } + + return -ENOTTY; +} + +/* Module initialization */ +static const struct file_operations fops = { + .open = ec_device_open, + .release = ec_device_release, + .read = ec_device_read, + .unlocked_ioctl = ec_device_ioctl, +}; + +static int ec_device_probe(struct platform_device *pdev) +{ + struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent); + int retval = -ENOTTY; + dev_t devno = MKDEV(ec_major, 0); + + /* Instantiate it (and remember the EC) */ + cdev_init(&ec->cdev, &fops); + + retval = cdev_add(&ec->cdev, devno, 1); + if (retval) { + dev_err(&pdev->dev, ": failed to add character device\n"); + return retval; + } + + ec->vdev = device_create(cros_class, NULL, devno, ec, + CROS_EC_DEV_NAME); + if (IS_ERR(ec->vdev)) { + retval = PTR_ERR(ec->vdev); + dev_err(&pdev->dev, ": failed to create device\n"); + cdev_del(&ec->cdev); + return retval; + } + + /* Initialize extra interfaces */ + ec_dev_sysfs_init(ec); + ec_dev_lightbar_init(ec); + + return 0; +} + +static int ec_device_remove(struct platform_device *pdev) +{ + struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent); + + ec_dev_lightbar_remove(ec); + ec_dev_sysfs_remove(ec); + device_destroy(cros_class, MKDEV(ec_major, 0)); + cdev_del(&ec->cdev); + return 0; +} + +static struct platform_driver cros_ec_dev_driver = { + .driver = { + .name = "cros-ec-ctl", + }, + .probe = ec_device_probe, + .remove = ec_device_remove, +}; + +static int __init cros_ec_dev_init(void) +{ + int ret; + dev_t dev = 0; + + cros_class = class_create(THIS_MODULE, "chromeos"); + if (IS_ERR(cros_class)) { + pr_err(CROS_EC_DEV_NAME ": failed to register device class\n"); + return PTR_ERR(cros_class); + } + + /* Get a range of minor numbers (starting with 0) to work with */ + ret = alloc_chrdev_region(&dev, 0, CROS_MAX_DEV, CROS_EC_DEV_NAME); + if (ret < 0) { + pr_err(CROS_EC_DEV_NAME ": alloc_chrdev_region() failed\n"); + goto failed_chrdevreg; + } + ec_major = MAJOR(dev); + + /* Register the driver */ + ret = platform_driver_register(&cros_ec_dev_driver); + if (ret < 0) { + pr_warn(CROS_EC_DEV_NAME ": can't register driver: %d\n", ret); + goto failed_devreg; + } + return 0; + +failed_devreg: + unregister_chrdev_region(MKDEV(ec_major, 0), CROS_MAX_DEV); +failed_chrdevreg: + class_destroy(cros_class); + return ret; +} + +static void __exit cros_ec_dev_exit(void) +{ + platform_driver_unregister(&cros_ec_dev_driver); + unregister_chrdev(ec_major, CROS_EC_DEV_NAME); + class_destroy(cros_class); +} + +module_init(cros_ec_dev_init); +module_exit(cros_ec_dev_exit); + +MODULE_AUTHOR("Bill Richardson <wfrichar@chromium.org>"); +MODULE_DESCRIPTION("Userspace interface to the Chrome OS Embedded Controller"); +MODULE_VERSION("1.0"); +MODULE_LICENSE("GPL"); diff --git a/kernel/drivers/platform/chrome/cros_ec_dev.h b/kernel/drivers/platform/chrome/cros_ec_dev.h new file mode 100644 index 000000000..45d67f7e5 --- /dev/null +++ b/kernel/drivers/platform/chrome/cros_ec_dev.h @@ -0,0 +1,53 @@ +/* + * cros_ec_dev - expose the Chrome OS Embedded Controller to userspace + * + * Copyright (C) 2014 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, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _CROS_EC_DEV_H_ +#define _CROS_EC_DEV_H_ + +#include <linux/ioctl.h> +#include <linux/types.h> +#include <linux/mfd/cros_ec.h> + +#define CROS_EC_DEV_NAME "cros_ec" +#define CROS_EC_DEV_VERSION "1.0.0" + +/* + * @offset: within EC_LPC_ADDR_MEMMAP region + * @bytes: number of bytes to read. zero means "read a string" (including '\0') + * (at most only EC_MEMMAP_SIZE bytes can be read) + * @buffer: where to store the result + * ioctl returns the number of bytes read, negative on error + */ +struct cros_ec_readmem { + uint32_t offset; + uint32_t bytes; + uint8_t buffer[EC_MEMMAP_SIZE]; +}; + +#define CROS_EC_DEV_IOC 0xEC +#define CROS_EC_DEV_IOCXCMD _IOWR(CROS_EC_DEV_IOC, 0, struct cros_ec_command) +#define CROS_EC_DEV_IOCRDMEM _IOWR(CROS_EC_DEV_IOC, 1, struct cros_ec_readmem) + +void ec_dev_sysfs_init(struct cros_ec_device *); +void ec_dev_sysfs_remove(struct cros_ec_device *); + +void ec_dev_lightbar_init(struct cros_ec_device *); +void ec_dev_lightbar_remove(struct cros_ec_device *); + +#endif /* _CROS_EC_DEV_H_ */ diff --git a/kernel/drivers/platform/chrome/cros_ec_lightbar.c b/kernel/drivers/platform/chrome/cros_ec_lightbar.c new file mode 100644 index 000000000..b4ff47a90 --- /dev/null +++ b/kernel/drivers/platform/chrome/cros_ec_lightbar.c @@ -0,0 +1,367 @@ +/* + * cros_ec_lightbar - expose the Chromebook Pixel lightbar to userspace + * + * Copyright (C) 2014 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, see <http://www.gnu.org/licenses/>. + */ + +#define pr_fmt(fmt) "cros_ec_lightbar: " fmt + +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/kobject.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/types.h> +#include <linux/uaccess.h> + +#include "cros_ec_dev.h" + +/* Rate-limit the lightbar interface to prevent DoS. */ +static unsigned long lb_interval_jiffies = 50 * HZ / 1000; + +static ssize_t interval_msec_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long msec = lb_interval_jiffies * 1000 / HZ; + + return scnprintf(buf, PAGE_SIZE, "%lu\n", msec); +} + +static ssize_t interval_msec_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long msec; + + if (kstrtoul(buf, 0, &msec)) + return -EINVAL; + + lb_interval_jiffies = msec * HZ / 1000; + + return count; +} + +static DEFINE_MUTEX(lb_mutex); +/* Return 0 if able to throttle correctly, error otherwise */ +static int lb_throttle(void) +{ + static unsigned long last_access; + unsigned long now, next_timeslot; + long delay; + int ret = 0; + + mutex_lock(&lb_mutex); + + now = jiffies; + next_timeslot = last_access + lb_interval_jiffies; + + if (time_before(now, next_timeslot)) { + delay = (long)(next_timeslot) - (long)now; + set_current_state(TASK_INTERRUPTIBLE); + if (schedule_timeout(delay) > 0) { + /* interrupted - just abort */ + ret = -EINTR; + goto out; + } + now = jiffies; + } + + last_access = now; +out: + mutex_unlock(&lb_mutex); + + return ret; +} + +#define INIT_MSG(P, R) { \ + .command = EC_CMD_LIGHTBAR_CMD, \ + .outsize = sizeof(*P), \ + .insize = sizeof(*R), \ + } + +static int get_lightbar_version(struct cros_ec_device *ec, + uint32_t *ver_ptr, uint32_t *flg_ptr) +{ + struct ec_params_lightbar *param; + struct ec_response_lightbar *resp; + struct cros_ec_command msg = INIT_MSG(param, resp); + int ret; + + param = (struct ec_params_lightbar *)msg.outdata; + param->cmd = LIGHTBAR_CMD_VERSION; + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return 0; + + switch (msg.result) { + case EC_RES_INVALID_PARAM: + /* Pixel had no version command. */ + if (ver_ptr) + *ver_ptr = 0; + if (flg_ptr) + *flg_ptr = 0; + return 1; + + case EC_RES_SUCCESS: + resp = (struct ec_response_lightbar *)msg.indata; + + /* Future devices w/lightbars should implement this command */ + if (ver_ptr) + *ver_ptr = resp->version.num; + if (flg_ptr) + *flg_ptr = resp->version.flags; + return 1; + } + + /* Anything else (ie, EC_RES_INVALID_COMMAND) - no lightbar */ + return 0; +} + +static ssize_t version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + uint32_t version, flags; + struct cros_ec_device *ec = dev_get_drvdata(dev); + int ret; + + ret = lb_throttle(); + if (ret) + return ret; + + /* This should always succeed, because we check during init. */ + if (!get_lightbar_version(ec, &version, &flags)) + return -EIO; + + return scnprintf(buf, PAGE_SIZE, "%d %d\n", version, flags); +} + +static ssize_t brightness_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ec_params_lightbar *param; + struct ec_response_lightbar *resp; + struct cros_ec_command msg = INIT_MSG(param, resp); + int ret; + unsigned int val; + struct cros_ec_device *ec = dev_get_drvdata(dev); + + if (kstrtouint(buf, 0, &val)) + return -EINVAL; + + param = (struct ec_params_lightbar *)msg.outdata; + param->cmd = LIGHTBAR_CMD_BRIGHTNESS; + param->brightness.num = val; + ret = lb_throttle(); + if (ret) + return ret; + + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + + if (msg.result != EC_RES_SUCCESS) + return -EINVAL; + + return count; +} + + +/* + * We expect numbers, and we'll keep reading until we find them, skipping over + * any whitespace (sysfs guarantees that the input is null-terminated). Every + * four numbers are sent to the lightbar as <LED,R,G,B>. We fail at the first + * parsing error, if we don't parse any numbers, or if we have numbers left + * over. + */ +static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ec_params_lightbar *param; + struct ec_response_lightbar *resp; + struct cros_ec_command msg = INIT_MSG(param, resp); + struct cros_ec_device *ec = dev_get_drvdata(dev); + unsigned int val[4]; + int ret, i = 0, j = 0, ok = 0; + + do { + /* Skip any whitespace */ + while (*buf && isspace(*buf)) + buf++; + + if (!*buf) + break; + + ret = sscanf(buf, "%i", &val[i++]); + if (ret == 0) + return -EINVAL; + + if (i == 4) { + param = (struct ec_params_lightbar *)msg.outdata; + param->cmd = LIGHTBAR_CMD_RGB; + param->rgb.led = val[0]; + param->rgb.red = val[1]; + param->rgb.green = val[2]; + param->rgb.blue = val[3]; + /* + * Throttle only the first of every four transactions, + * so that the user can update all four LEDs at once. + */ + if ((j++ % 4) == 0) { + ret = lb_throttle(); + if (ret) + return ret; + } + + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + + if (msg.result != EC_RES_SUCCESS) + return -EINVAL; + + i = 0; + ok = 1; + } + + /* Skip over the number we just read */ + while (*buf && !isspace(*buf)) + buf++; + + } while (*buf); + + return (ok && i == 0) ? count : -EINVAL; +} + +static char const *seqname[] = { + "ERROR", "S5", "S3", "S0", "S5S3", "S3S0", + "S0S3", "S3S5", "STOP", "RUN", "PULSE", "TEST", "KONAMI", +}; + +static ssize_t sequence_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ec_params_lightbar *param; + struct ec_response_lightbar *resp; + struct cros_ec_command msg = INIT_MSG(param, resp); + int ret; + struct cros_ec_device *ec = dev_get_drvdata(dev); + + param = (struct ec_params_lightbar *)msg.outdata; + param->cmd = LIGHTBAR_CMD_GET_SEQ; + ret = lb_throttle(); + if (ret) + return ret; + + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + + if (msg.result != EC_RES_SUCCESS) + return scnprintf(buf, PAGE_SIZE, + "ERROR: EC returned %d\n", msg.result); + + resp = (struct ec_response_lightbar *)msg.indata; + if (resp->get_seq.num >= ARRAY_SIZE(seqname)) + return scnprintf(buf, PAGE_SIZE, "%d\n", resp->get_seq.num); + else + return scnprintf(buf, PAGE_SIZE, "%s\n", + seqname[resp->get_seq.num]); +} + +static ssize_t sequence_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ec_params_lightbar *param; + struct ec_response_lightbar *resp; + struct cros_ec_command msg = INIT_MSG(param, resp); + unsigned int num; + int ret, len; + struct cros_ec_device *ec = dev_get_drvdata(dev); + + for (len = 0; len < count; len++) + if (!isalnum(buf[len])) + break; + + for (num = 0; num < ARRAY_SIZE(seqname); num++) + if (!strncasecmp(seqname[num], buf, len)) + break; + + if (num >= ARRAY_SIZE(seqname)) { + ret = kstrtouint(buf, 0, &num); + if (ret) + return ret; + } + + param = (struct ec_params_lightbar *)msg.outdata; + param->cmd = LIGHTBAR_CMD_SEQ; + param->seq.num = num; + ret = lb_throttle(); + if (ret) + return ret; + + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + + if (msg.result != EC_RES_SUCCESS) + return -EINVAL; + + return count; +} + +/* Module initialization */ + +static DEVICE_ATTR_RW(interval_msec); +static DEVICE_ATTR_RO(version); +static DEVICE_ATTR_WO(brightness); +static DEVICE_ATTR_WO(led_rgb); +static DEVICE_ATTR_RW(sequence); +static struct attribute *__lb_cmds_attrs[] = { + &dev_attr_interval_msec.attr, + &dev_attr_version.attr, + &dev_attr_brightness.attr, + &dev_attr_led_rgb.attr, + &dev_attr_sequence.attr, + NULL, +}; +static struct attribute_group lb_cmds_attr_group = { + .name = "lightbar", + .attrs = __lb_cmds_attrs, +}; + +void ec_dev_lightbar_init(struct cros_ec_device *ec) +{ + int ret = 0; + + /* Only instantiate this stuff if the EC has a lightbar */ + if (!get_lightbar_version(ec, NULL, NULL)) + return; + + ret = sysfs_create_group(&ec->vdev->kobj, &lb_cmds_attr_group); + if (ret) + pr_warn("sysfs_create_group() failed: %d\n", ret); +} + +void ec_dev_lightbar_remove(struct cros_ec_device *ec) +{ + sysfs_remove_group(&ec->vdev->kobj, &lb_cmds_attr_group); +} diff --git a/kernel/drivers/platform/chrome/cros_ec_lpc.c b/kernel/drivers/platform/chrome/cros_ec_lpc.c new file mode 100644 index 000000000..8f9ac4d7b --- /dev/null +++ b/kernel/drivers/platform/chrome/cros_ec_lpc.c @@ -0,0 +1,319 @@ +/* + * cros_ec_lpc - LPC access to the Chrome OS Embedded Controller + * + * Copyright (C) 2012-2015 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + * This driver uses the Chrome OS EC byte-level message-based protocol for + * communicating the keyboard state (which keys are pressed) from a keyboard EC + * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing, + * but everything else (including deghosting) is done here. The main + * motivation for this is to keep the EC firmware as simple as possible, since + * it cannot be easily upgraded and EC flash/IRAM space is relatively + * expensive. + */ + +#include <linux/dmi.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/printk.h> + +#define DRV_NAME "cros_ec_lpc" + +static int ec_response_timed_out(void) +{ + unsigned long one_second = jiffies + HZ; + + usleep_range(200, 300); + do { + if (!(inb(EC_LPC_ADDR_HOST_CMD) & EC_LPC_STATUS_BUSY_MASK)) + return 0; + usleep_range(100, 200); + } while (time_before(jiffies, one_second)); + + return 1; +} + +static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec, + struct cros_ec_command *msg) +{ + struct ec_lpc_host_args args; + int csum; + int i; + int ret = 0; + + if (msg->outsize > EC_PROTO2_MAX_PARAM_SIZE || + msg->insize > EC_PROTO2_MAX_PARAM_SIZE) { + dev_err(ec->dev, + "invalid buffer sizes (out %d, in %d)\n", + msg->outsize, msg->insize); + return -EINVAL; + } + + /* Now actually send the command to the EC and get the result */ + args.flags = EC_HOST_ARGS_FLAG_FROM_HOST; + args.command_version = msg->version; + args.data_size = msg->outsize; + + /* Initialize checksum */ + csum = msg->command + args.flags + + args.command_version + args.data_size; + + /* Copy data and update checksum */ + for (i = 0; i < msg->outsize; i++) { + outb(msg->outdata[i], EC_LPC_ADDR_HOST_PARAM + i); + csum += msg->outdata[i]; + } + + /* Finalize checksum and write args */ + args.checksum = csum & 0xFF; + outb(args.flags, EC_LPC_ADDR_HOST_ARGS); + outb(args.command_version, EC_LPC_ADDR_HOST_ARGS + 1); + outb(args.data_size, EC_LPC_ADDR_HOST_ARGS + 2); + outb(args.checksum, EC_LPC_ADDR_HOST_ARGS + 3); + + /* Here we go */ + outb(msg->command, EC_LPC_ADDR_HOST_CMD); + + if (ec_response_timed_out()) { + dev_warn(ec->dev, "EC responsed timed out\n"); + ret = -EIO; + goto done; + } + + /* Check result */ + msg->result = inb(EC_LPC_ADDR_HOST_DATA); + + switch (msg->result) { + case EC_RES_SUCCESS: + break; + case EC_RES_IN_PROGRESS: + ret = -EAGAIN; + dev_dbg(ec->dev, "command 0x%02x in progress\n", + msg->command); + goto done; + default: + dev_dbg(ec->dev, "command 0x%02x returned %d\n", + msg->command, msg->result); + } + + /* Read back args */ + args.flags = inb(EC_LPC_ADDR_HOST_ARGS); + args.command_version = inb(EC_LPC_ADDR_HOST_ARGS + 1); + args.data_size = inb(EC_LPC_ADDR_HOST_ARGS + 2); + args.checksum = inb(EC_LPC_ADDR_HOST_ARGS + 3); + + if (args.data_size > msg->insize) { + dev_err(ec->dev, + "packet too long (%d bytes, expected %d)", + args.data_size, msg->insize); + ret = -ENOSPC; + goto done; + } + + /* Start calculating response checksum */ + csum = msg->command + args.flags + + args.command_version + args.data_size; + + /* Read response and update checksum */ + for (i = 0; i < args.data_size; i++) { + msg->indata[i] = inb(EC_LPC_ADDR_HOST_PARAM + i); + csum += msg->indata[i]; + } + + /* Verify checksum */ + if (args.checksum != (csum & 0xFF)) { + dev_err(ec->dev, + "bad packet checksum, expected %02x, got %02x\n", + args.checksum, csum & 0xFF); + ret = -EBADMSG; + goto done; + } + + /* Return actual amount of data received */ + ret = args.data_size; +done: + return ret; +} + +/* Returns num bytes read, or negative on error. Doesn't need locking. */ +static int cros_ec_lpc_readmem(struct cros_ec_device *ec, unsigned int offset, + unsigned int bytes, void *dest) +{ + int i = offset; + char *s = dest; + int cnt = 0; + + if (offset >= EC_MEMMAP_SIZE - bytes) + return -EINVAL; + + /* fixed length */ + if (bytes) { + for (; cnt < bytes; i++, s++, cnt++) + *s = inb(EC_LPC_ADDR_MEMMAP + i); + return cnt; + } + + /* string */ + for (; i < EC_MEMMAP_SIZE; i++, s++) { + *s = inb(EC_LPC_ADDR_MEMMAP + i); + cnt++; + if (!*s) + break; + } + + return cnt; +} + +static int cros_ec_lpc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_device *ec_dev; + int ret; + + if (!devm_request_region(dev, EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE, + dev_name(dev))) { + dev_err(dev, "couldn't reserve memmap region\n"); + return -EBUSY; + } + + if ((inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID) != 'E') || + (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1) != 'C')) { + dev_err(dev, "EC ID not detected\n"); + return -ENODEV; + } + + if (!devm_request_region(dev, EC_HOST_CMD_REGION0, + EC_HOST_CMD_REGION_SIZE, dev_name(dev))) { + dev_err(dev, "couldn't reserve region0\n"); + return -EBUSY; + } + if (!devm_request_region(dev, EC_HOST_CMD_REGION1, + EC_HOST_CMD_REGION_SIZE, dev_name(dev))) { + dev_err(dev, "couldn't reserve region1\n"); + return -EBUSY; + } + + ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); + if (!ec_dev) + return -ENOMEM; + + platform_set_drvdata(pdev, ec_dev); + ec_dev->dev = dev; + ec_dev->ec_name = pdev->name; + ec_dev->phys_name = dev_name(dev); + ec_dev->parent = dev; + ec_dev->cmd_xfer = cros_ec_cmd_xfer_lpc; + ec_dev->cmd_readmem = cros_ec_lpc_readmem; + + ret = cros_ec_register(ec_dev); + if (ret) { + dev_err(dev, "couldn't register ec_dev (%d)\n", ret); + return ret; + } + + return 0; +} + +static int cros_ec_lpc_remove(struct platform_device *pdev) +{ + struct cros_ec_device *ec_dev; + + ec_dev = platform_get_drvdata(pdev); + cros_ec_remove(ec_dev); + + return 0; +} + +static struct dmi_system_id cros_ec_lpc_dmi_table[] __initdata = { + { + /* + * Today all Chromebooks/boxes ship with Google_* as version and + * coreboot as bios vendor. No other systems with this + * combination are known to date. + */ + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_BIOS_VERSION, "Google_"), + }, + }, + { + /* x86-link, the Chromebook Pixel. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Link"), + }, + }, + { + /* x86-peppy, the Acer C720 Chromebook. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), + DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"), + }, + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table); + +static struct platform_driver cros_ec_lpc_driver = { + .driver = { + .name = DRV_NAME, + }, + .probe = cros_ec_lpc_probe, + .remove = cros_ec_lpc_remove, +}; + +static struct platform_device cros_ec_lpc_device = { + .name = DRV_NAME +}; + +static int __init cros_ec_lpc_init(void) +{ + int ret; + + if (!dmi_check_system(cros_ec_lpc_dmi_table)) { + pr_err(DRV_NAME ": unsupported system.\n"); + return -ENODEV; + } + + /* Register the driver */ + ret = platform_driver_register(&cros_ec_lpc_driver); + if (ret) { + pr_err(DRV_NAME ": can't register driver: %d\n", ret); + return ret; + } + + /* Register the device, and it'll get hooked up automatically */ + ret = platform_device_register(&cros_ec_lpc_device); + if (ret) { + pr_err(DRV_NAME ": can't register device: %d\n", ret); + platform_driver_unregister(&cros_ec_lpc_driver); + return ret; + } + + return 0; +} + +static void __exit cros_ec_lpc_exit(void) +{ + platform_device_unregister(&cros_ec_lpc_device); + platform_driver_unregister(&cros_ec_lpc_driver); +} + +module_init(cros_ec_lpc_init); +module_exit(cros_ec_lpc_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ChromeOS EC LPC driver"); diff --git a/kernel/drivers/platform/chrome/cros_ec_sysfs.c b/kernel/drivers/platform/chrome/cros_ec_sysfs.c new file mode 100644 index 000000000..fb62ab6cc --- /dev/null +++ b/kernel/drivers/platform/chrome/cros_ec_sysfs.c @@ -0,0 +1,271 @@ +/* + * cros_ec_sysfs - expose the Chrome OS EC through sysfs + * + * Copyright (C) 2014 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, see <http://www.gnu.org/licenses/>. + */ + +#define pr_fmt(fmt) "cros_ec_sysfs: " fmt + +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/kobject.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/printk.h> +#include <linux/stat.h> +#include <linux/types.h> +#include <linux/uaccess.h> + +#include "cros_ec_dev.h" + +/* Accessor functions */ + +static ssize_t show_ec_reboot(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int count = 0; + + count += scnprintf(buf + count, PAGE_SIZE - count, + "ro|rw|cancel|cold|disable-jump|hibernate"); + count += scnprintf(buf + count, PAGE_SIZE - count, + " [at-shutdown]\n"); + return count; +} + +static ssize_t store_ec_reboot(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + static const struct { + const char * const str; + uint8_t cmd; + uint8_t flags; + } words[] = { + {"cancel", EC_REBOOT_CANCEL, 0}, + {"ro", EC_REBOOT_JUMP_RO, 0}, + {"rw", EC_REBOOT_JUMP_RW, 0}, + {"cold", EC_REBOOT_COLD, 0}, + {"disable-jump", EC_REBOOT_DISABLE_JUMP, 0}, + {"hibernate", EC_REBOOT_HIBERNATE, 0}, + {"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN}, + }; + struct cros_ec_command msg = { 0 }; + struct ec_params_reboot_ec *param = + (struct ec_params_reboot_ec *)msg.outdata; + int got_cmd = 0, offset = 0; + int i; + int ret; + struct cros_ec_device *ec = dev_get_drvdata(dev); + + param->flags = 0; + while (1) { + /* Find word to start scanning */ + while (buf[offset] && isspace(buf[offset])) + offset++; + if (!buf[offset]) + break; + + for (i = 0; i < ARRAY_SIZE(words); i++) { + if (!strncasecmp(words[i].str, buf+offset, + strlen(words[i].str))) { + if (words[i].flags) { + param->flags |= words[i].flags; + } else { + param->cmd = words[i].cmd; + got_cmd = 1; + } + break; + } + } + + /* On to the next word, if any */ + while (buf[offset] && !isspace(buf[offset])) + offset++; + } + + if (!got_cmd) + return -EINVAL; + + msg.command = EC_CMD_REBOOT_EC; + msg.outsize = sizeof(param); + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + if (msg.result != EC_RES_SUCCESS) { + dev_dbg(ec->dev, "EC result %d\n", msg.result); + return -EINVAL; + } + + return count; +} + +static ssize_t show_ec_version(struct device *dev, + struct device_attribute *attr, char *buf) +{ + static const char * const image_names[] = {"unknown", "RO", "RW"}; + struct ec_response_get_version *r_ver; + struct ec_response_get_chip_info *r_chip; + struct ec_response_board_version *r_board; + struct cros_ec_command msg = { 0 }; + int ret; + int count = 0; + struct cros_ec_device *ec = dev_get_drvdata(dev); + + /* Get versions. RW may change. */ + msg.command = EC_CMD_GET_VERSION; + msg.insize = sizeof(*r_ver); + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + if (msg.result != EC_RES_SUCCESS) + return scnprintf(buf, PAGE_SIZE, + "ERROR: EC returned %d\n", msg.result); + + r_ver = (struct ec_response_get_version *)msg.indata; + /* Strings should be null-terminated, but let's be sure. */ + r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0'; + r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0'; + count += scnprintf(buf + count, PAGE_SIZE - count, + "RO version: %s\n", r_ver->version_string_ro); + count += scnprintf(buf + count, PAGE_SIZE - count, + "RW version: %s\n", r_ver->version_string_rw); + count += scnprintf(buf + count, PAGE_SIZE - count, + "Firmware copy: %s\n", + (r_ver->current_image < ARRAY_SIZE(image_names) ? + image_names[r_ver->current_image] : "?")); + + /* Get build info. */ + msg.command = EC_CMD_GET_BUILD_INFO; + msg.insize = sizeof(msg.indata); + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Build info: XFER ERROR %d\n", ret); + else if (msg.result != EC_RES_SUCCESS) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Build info: EC error %d\n", msg.result); + else { + msg.indata[sizeof(msg.indata) - 1] = '\0'; + count += scnprintf(buf + count, PAGE_SIZE - count, + "Build info: %s\n", msg.indata); + } + + /* Get chip info. */ + msg.command = EC_CMD_GET_CHIP_INFO; + msg.insize = sizeof(*r_chip); + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip info: XFER ERROR %d\n", ret); + else if (msg.result != EC_RES_SUCCESS) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip info: EC error %d\n", msg.result); + else { + r_chip = (struct ec_response_get_chip_info *)msg.indata; + + r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0'; + r_chip->name[sizeof(r_chip->name) - 1] = '\0'; + r_chip->revision[sizeof(r_chip->revision) - 1] = '\0'; + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip vendor: %s\n", r_chip->vendor); + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip name: %s\n", r_chip->name); + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip revision: %s\n", r_chip->revision); + } + + /* Get board version */ + msg.command = EC_CMD_GET_BOARD_VERSION; + msg.insize = sizeof(*r_board); + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Board version: XFER ERROR %d\n", ret); + else if (msg.result != EC_RES_SUCCESS) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Board version: EC error %d\n", msg.result); + else { + r_board = (struct ec_response_board_version *)msg.indata; + + count += scnprintf(buf + count, PAGE_SIZE - count, + "Board version: %d\n", + r_board->board_version); + } + + return count; +} + +static ssize_t show_ec_flashinfo(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ec_response_flash_info *resp; + struct cros_ec_command msg = { 0 }; + int ret; + struct cros_ec_device *ec = dev_get_drvdata(dev); + + /* The flash info shouldn't ever change, but ask each time anyway. */ + msg.command = EC_CMD_FLASH_INFO; + msg.insize = sizeof(*resp); + ret = cros_ec_cmd_xfer(ec, &msg); + if (ret < 0) + return ret; + if (msg.result != EC_RES_SUCCESS) + return scnprintf(buf, PAGE_SIZE, + "ERROR: EC returned %d\n", msg.result); + + resp = (struct ec_response_flash_info *)msg.indata; + + return scnprintf(buf, PAGE_SIZE, + "FlashSize %d\nWriteSize %d\n" + "EraseSize %d\nProtectSize %d\n", + resp->flash_size, resp->write_block_size, + resp->erase_block_size, resp->protect_block_size); +} + +/* Module initialization */ + +static DEVICE_ATTR(reboot, S_IWUSR | S_IRUGO, show_ec_reboot, store_ec_reboot); +static DEVICE_ATTR(version, S_IRUGO, show_ec_version, NULL); +static DEVICE_ATTR(flashinfo, S_IRUGO, show_ec_flashinfo, NULL); + +static struct attribute *__ec_attrs[] = { + &dev_attr_reboot.attr, + &dev_attr_version.attr, + &dev_attr_flashinfo.attr, + NULL, +}; + +static struct attribute_group ec_attr_group = { + .attrs = __ec_attrs, +}; + +void ec_dev_sysfs_init(struct cros_ec_device *ec) +{ + int error; + + error = sysfs_create_group(&ec->vdev->kobj, &ec_attr_group); + if (error) + pr_warn("failed to create group: %d\n", error); +} + +void ec_dev_sysfs_remove(struct cros_ec_device *ec) +{ + sysfs_remove_group(&ec->vdev->kobj, &ec_attr_group); +} |