// SPDX-License-Identifier: GPL-2.0+
// Driver to instantiate Chromebook i2c/smbus devices.
//
// Copyright (C) 2012 Google, Inc.
// Author: Benson Leung <[email protected]>
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/property.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 ELAN_TP_I2C_ADDR 0x15
#define ISL_ALS_I2C_ADDR 0x44
#define TAOS_ALS_I2C_ADDR 0x29
static const char *i2c_adapter_names[] = {
"SMBus I801 adapter",
"i915 gmbus vga",
"i915 gmbus panel",
"Synopsys DesignWare I2C adapter",
};
/* 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,
};
struct i2c_peripheral {
struct i2c_board_info board_info;
unsigned short alt_addr;
const char *dmi_name;
unsigned long irqflags;
struct resource irq_resource;
enum i2c_adapter_type type;
u32 pci_devid;
const struct property_entry *properties;
struct i2c_client *client;
};
struct acpi_peripheral {
char hid[ACPI_ID_LEN];
struct software_node swnode;
struct i2c_client *client;
};
struct chromeos_laptop {
/*
* Note that we can't mark this pointer as const because
* i2c_new_scanned_device() changes passed in I2C board info, so.
*/
struct i2c_peripheral *i2c_peripherals;
unsigned int num_i2c_peripherals;
struct acpi_peripheral *acpi_peripherals;
unsigned int num_acpi_peripherals;
};
static const struct chromeos_laptop *cros_laptop;
static struct i2c_client *
chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
struct i2c_board_info *info,
unsigned short alt_addr)
{
const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
struct i2c_client *client;
/*
* 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_scanned_device(adapter, info, addr_list, NULL);
if (IS_ERR(client) && alt_addr) {
struct i2c_board_info dummy_info = {
I2C_BOARD_INFO("dummy", info->addr),
};
const unsigned short alt_addr_list[] = {
alt_addr, I2C_CLIENT_END
};
struct i2c_client *dummy;
dummy = i2c_new_scanned_device(adapter, &dummy_info,
alt_addr_list, NULL);
if (!IS_ERR(dummy)) {
pr_debug("%d-%02x is probed at %02x\n",
adapter->nr, info->addr, dummy->addr);
i2c_unregister_device(dummy);
client = i2c_new_client_device(adapter, info);
}
}
if (IS_ERR(client)) {
client = NULL;
pr_debug("failed to register device %d-%02x\n",
adapter->nr, info->addr);
} else {
pr_debug("added i2c device %d-%02x\n",
adapter->nr, info->addr);
}
return client;
}
static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid)
{
struct pci_dev *pdev;
if (!dev_is_pci(dev))
return false;
pdev = to_pci_dev(dev);
return devid == pci_dev_id(pdev);
}
static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter)
{
struct i2c_peripheral *i2c_dev;
int i;
for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
i2c_dev = &cros_laptop->i2c_peripherals[i];
/* Skip devices already created */
if (i2c_dev->client)
continue;
if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type],
strlen(i2c_adapter_names[i2c_dev->type])))
continue;
if (i2c_dev->pci_devid &&
!chromeos_laptop_match_adapter_devid(adapter->dev.parent,
i2c_dev->pci_devid)) {
continue;
}
i2c_dev->client =
chromes_laptop_instantiate_i2c_device(adapter,
&i2c_dev->board_info,
i2c_dev->alt_addr);
}
}
static bool chromeos_laptop_adjust_client(struct i2c_client *client)
{
struct acpi_peripheral *acpi_dev;
struct acpi_device_id acpi_ids[2] = { };
int i;
int error;
if (!has_acpi_companion(&client->dev))
return false;
for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
acpi_dev = &cros_laptop->acpi_peripherals[i];
memcpy(acpi_ids[0].id, acpi_dev->hid, ACPI_ID_LEN);
if (acpi_match_device(acpi_ids, &client->dev)) {
error = device_add_software_node(&client->dev, &acpi_dev->swnode);
if (error) {
dev_err(&client->dev,
"failed to add properties: %d\n",
error);
break;
}
acpi_dev->client = client;
return true;
}
}
return false;
}
static void chromeos_laptop_detach_i2c_client(struct i2c_client *client)
{
struct acpi_peripheral *acpi_dev;
struct i2c_peripheral *i2c_dev;
int i;
if (has_acpi_companion(&client->dev))
for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
acpi_dev = &cros_laptop->acpi_peripherals[i];
if (acpi_dev->client == client) {
acpi_dev->client = NULL;
return;
}
}
else
for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
i2c_dev = &cros_laptop->i2c_peripherals[i];
if (i2c_dev->client == client) {
i2c_dev->client = NULL;
return;
}
}
}
static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
if (dev->type == &i2c_adapter_type)
chromeos_laptop_check_adapter(to_i2c_adapter(dev));
else if (dev->type == &i2c_client_type)
chromeos_laptop_adjust_client(to_i2c_client(dev));
break;
case BUS_NOTIFY_REMOVED_DEVICE:
if (dev->type == &i2c_client_type)
chromeos_laptop_detach_i2c_client(to_i2c_client(dev));
break;
}
return 0;
}
static struct notifier_block chromeos_laptop_i2c_notifier = {
.notifier_call = chromeos_laptop_i2c_notifier_call,
};
#define DECLARE_CROS_LAPTOP(_name) \
static const struct chromeos_laptop _name __initconst = { \
.i2c_peripherals = _name##_peripherals, \
.num_i2c_peripherals = ARRAY_SIZE(_name##_peripherals), \
}
#define DECLARE_ACPI_CROS_LAPTOP(_name) \
static const struct chromeos_laptop _name __initconst = { \
.acpi_peripherals = _name##_peripherals, \
.num_acpi_peripherals = ARRAY_SIZE(_name##_peripherals), \
}
static struct i2c_peripheral samsung_series_5_550_peripherals[] __initdata = {
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_SMBUS,
},
/* Light Sensor. */
{
.board_info = {
I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
},
.dmi_name = "lightsensor",
.type = I2C_ADAPTER_SMBUS,
},
};
DECLARE_CROS_LAPTOP(samsung_series_5_550);
static struct i2c_peripheral samsung_series_5_peripherals[] __initdata = {
/* Light Sensor. */
{
.board_info = {
I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
},
.type = I2C_ADAPTER_SMBUS,
},
};
DECLARE_CROS_LAPTOP(samsung_series_5);
static const int chromebook_pixel_tp_keys[] __initconst = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
BTN_LEFT
};
static const struct property_entry
chromebook_pixel_trackpad_props[] __initconst = {
PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", chromebook_pixel_tp_keys),
{ }
};
static const struct property_entry
chromebook_atmel_touchscreen_props[] __initconst = {
PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
{ }
};
static struct i2c_peripheral chromebook_pixel_peripherals[] __initdata = {
/* Touch Screen. */
{
.board_info = {
I2C_BOARD_INFO("atmel_mxt_ts",
ATMEL_TS_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "touchscreen",
.irqflags = IRQF_TRIGGER_FALLING,
.type = I2C_ADAPTER_PANEL,
.alt_addr = ATMEL_TS_I2C_BL_ADDR,
.properties = chromebook_atmel_touchscreen_props,
},
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("atmel_mxt_tp",
ATMEL_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.irqflags = IRQF_TRIGGER_FALLING,
.type = I2C_ADAPTER_VGADDC,
.alt_addr = ATMEL_TP_I2C_BL_ADDR,
.properties = chromebook_pixel_trackpad_props,
},
/* Light Sensor. */
{
.board_info = {
I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
},
.dmi_name = "lightsensor",
.type = I2C_ADAPTER_PANEL,
},
};
DECLARE_CROS_LAPTOP(chromebook_pixel);
static struct i2c_peripheral hp_chromebook_14_peripherals[] __initdata = {
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_DESIGNWARE,
},
};
DECLARE_CROS_LAPTOP(hp_chromebook_14);
static struct i2c_peripheral dell_chromebook_11_peripherals[] __initdata = {
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_DESIGNWARE,
},
/* Elan Touchpad option. */
{
.board_info = {
I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_DESIGNWARE,
},
};
DECLARE_CROS_LAPTOP(dell_chromebook_11);
static struct i2c_peripheral toshiba_cb35_peripherals[] __initdata = {
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_DESIGNWARE,
},
};
DECLARE_CROS_LAPTOP(toshiba_cb35);
static struct i2c_peripheral acer_c7_chromebook_peripherals[] __initdata = {
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_SMBUS,
},
};
DECLARE_CROS_LAPTOP(acer_c7_chromebook);
static struct i2c_peripheral acer_ac700_peripherals[] __initdata = {
/* Light Sensor. */
{
.board_info = {
I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
},
.type = I2C_ADAPTER_SMBUS,
},
};
DECLARE_CROS_LAPTOP(acer_ac700);
static struct i2c_peripheral acer_c720_peripherals[] __initdata = {
/* Touchscreen. */
{
.board_info = {
I2C_BOARD_INFO("atmel_mxt_ts",
ATMEL_TS_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "touchscreen",
.irqflags = IRQF_TRIGGER_FALLING,
.type = I2C_ADAPTER_DESIGNWARE,
.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
.alt_addr = ATMEL_TS_I2C_BL_ADDR,
.properties = chromebook_atmel_touchscreen_props,
},
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_DESIGNWARE,
.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
},
/* Elan Touchpad option. */
{
.board_info = {
I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_DESIGNWARE,
.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
},
/* Light Sensor. */
{
.board_info = {
I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
},
.dmi_name = "lightsensor",
.type = I2C_ADAPTER_DESIGNWARE,
.pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
},
};
DECLARE_CROS_LAPTOP(acer_c720);
static struct i2c_peripheral
hp_pavilion_14_chromebook_peripherals[] __initdata = {
/* Touchpad. */
{
.board_info = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
},
.dmi_name = "trackpad",
.type = I2C_ADAPTER_SMBUS,
},
};
DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook);
static struct i2c_peripheral cr48_peripherals[] __initdata = {
/* Light Sensor. */
{
.board_info = {
I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
},
.type = I2C_ADAPTER_SMBUS,
},
};
DECLARE_CROS_LAPTOP(cr48);
static const u32 samus_touchpad_buttons[] __initconst = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
BTN_LEFT
};
static const struct property_entry samus_trackpad_props[] __initconst = {
PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", samus_touchpad_buttons),
{ }
};
static struct acpi_peripheral samus_peripherals[] __initdata = {
/* Touchpad */
{
.hid = "ATML0000",
.swnode = {
.properties = samus_trackpad_props,
},
},
/* Touchsceen */
{
.hid = "ATML0001",
.swnode = {
.properties = chromebook_atmel_touchscreen_props,
},
},
};
DECLARE_ACPI_CROS_LAPTOP(samus);
static struct acpi_peripheral generic_atmel_peripherals[] __initdata = {
/* Touchpad */
{
.hid = "ATML0000",
.swnode = {
.properties = chromebook_pixel_trackpad_props,
},
},
/* Touchsceen */
{
.hid = "ATML0001",
.swnode = {
.properties = chromebook_atmel_touchscreen_props,
},
},
};
DECLARE_ACPI_CROS_LAPTOP(generic_atmel);
static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
{
.ident = "Samsung Series 5 550",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
},
.driver_data = (void *)&samsung_series_5_550,
},
{
.ident = "Samsung Series 5",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
},
.driver_data = (void *)&samsung_series_5,
},
{
.ident = "Chromebook Pixel",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
},
.driver_data = (void *)&chromebook_pixel,
},
{
.ident = "Wolf",
.matches = {
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
},
.driver_data = (void *)&dell_chromebook_11,
},
{
.ident = "HP Chromebook 14",
.matches = {
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
},
.driver_data = (void *)&hp_chromebook_14,
},
{
.ident = "Toshiba CB35",
.matches = {
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
},
.driver_data = (void *)&toshiba_cb35,
},
{
.ident = "Acer C7 Chromebook",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
},
.driver_data = (void *)&acer_c7_chromebook,
},
{
.ident = "Acer AC700",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
},
.driver_data = (void *)&acer_ac700,
},
{
.ident = "Acer C720",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
},
.driver_data = (void *)&acer_c720,
},
{
.ident = "HP Pavilion 14 Chromebook",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
},
.driver_data = (void *)&hp_pavilion_14_chromebook,
},
{
.ident = "Cr-48",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
},
.driver_data = (void *)&cr48,
},
/* Devices with peripherals incompletely described in ACPI */
{
.ident = "Chromebook Pro",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Google"),
DMI_MATCH(DMI_PRODUCT_NAME, "Caroline"),
},
.driver_data = (void *)&samus,
},
{
.ident = "Google Pixel 2 (2015)",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Samus"),
},
.driver_data = (void *)&samus,
},
{
.ident = "Samsung Chromebook 3",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Celes"),
},
.driver_data = (void *)&samus,
},
{
/*
* Other Chromebooks with Atmel touch controllers:
* - Winky (touchpad)
* - Clapper, Expresso, Rambi, Glimmer (touchscreen)
*/
.ident = "Other Chromebook",
.matches = {
/*
* This will match all Google devices, not only devices
* with Atmel, but we will validate that the device
* actually has matching peripherals.
*/
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
},
.driver_data = (void *)&generic_atmel,
},
{ }
};
MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
static int __init chromeos_laptop_scan_peripherals(struct device *dev, void *data)
{
int error;
if (dev->type == &i2c_adapter_type) {
chromeos_laptop_check_adapter(to_i2c_adapter(dev));
} else if (dev->type == &i2c_client_type) {
if (chromeos_laptop_adjust_client(to_i2c_client(dev))) {
/*
* Now that we have needed properties re-trigger
* driver probe in case driver was initialized
* earlier and probe failed.
*/
error = device_attach(dev);
if (error < 0)
dev_warn(dev,
"%s: device_attach() failed: %d\n",
__func__, error);
}
}
return 0;
}
static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name)
{
const struct dmi_device *dmi_dev;
const struct dmi_dev_onboard *dev_data;
dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL);
if (!dmi_dev) {
pr_err("failed to find DMI device '%s'\n", dmi_name);
return -ENOENT;
}
dev_data = dmi_dev->device_data;
if (!dev_data) {
pr_err("failed to get data from DMI for '%s'\n", dmi_name);
return -EINVAL;
}
return dev_data->instance;
}
static int __init chromeos_laptop_setup_irq(struct i2c_peripheral *i2c_dev)
{
int irq;
if (i2c_dev->dmi_name) {
irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name);
if (irq < 0)
return irq;
i2c_dev->irq_resource = (struct resource)
DEFINE_RES_NAMED(irq, 1, NULL,
IORESOURCE_IRQ | i2c_dev->irqflags);
i2c_dev->board_info.resources = &i2c_dev->irq_resource;
i2c_dev->board_info.num_resources = 1;
}
return 0;
}
static int __init
chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop,
const struct chromeos_laptop *src)
{
struct i2c_peripheral *i2c_peripherals;
struct i2c_peripheral *i2c_dev;
struct i2c_board_info *info;
int i;
int error;
if (!src->num_i2c_peripherals)
return 0;
i2c_peripherals = kmemdup_array(src->i2c_peripherals,
src->num_i2c_peripherals,
sizeof(*i2c_peripherals), GFP_KERNEL);
if (!i2c_peripherals)
return -ENOMEM;
for (i = 0; i < src->num_i2c_peripherals; i++) {
i2c_dev = &i2c_peripherals[i];
info = &i2c_dev->board_info;
error = chromeos_laptop_setup_irq(i2c_dev);
if (error)
goto err_out;
/* Create primary fwnode for the device - copies everything */
if (i2c_dev->properties) {
info->fwnode = fwnode_create_software_node(i2c_dev->properties, NULL);
if (IS_ERR(info->fwnode)) {
error = PTR_ERR(info->fwnode);
goto err_out;
}
}
}
cros_laptop->i2c_peripherals = i2c_peripherals;
cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
return 0;
err_out:
while (--i >= 0) {
i2c_dev = &i2c_peripherals[i];
info = &i2c_dev->board_info;
if (!IS_ERR_OR_NULL(info->fwnode))
fwnode_remove_software_node(info->fwnode);
}
kfree(i2c_peripherals);
return error;
}
static int __init
chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop,
const struct chromeos_laptop *src)
{
struct acpi_peripheral *acpi_peripherals;
struct acpi_peripheral *acpi_dev;
const struct acpi_peripheral *src_dev;
int n_peripherals = 0;
int i;
int error;
for (i = 0; i < src->num_acpi_peripherals; i++) {
if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1))
n_peripherals++;
}
if (!n_peripherals)
return 0;
acpi_peripherals = kcalloc(n_peripherals,
sizeof(*src->acpi_peripherals),
GFP_KERNEL);
if (!acpi_peripherals)
return -ENOMEM;
acpi_dev = acpi_peripherals;
for (i = 0; i < src->num_acpi_peripherals; i++) {
src_dev = &src->acpi_peripherals[i];
if (!acpi_dev_present(src_dev->hid, NULL, -1))
continue;
*acpi_dev = *src_dev;
/* We need to deep-copy properties */
if (src_dev->swnode.properties) {
acpi_dev->swnode.properties =
property_entries_dup(src_dev->swnode.properties);
if (IS_ERR(acpi_dev->swnode.properties)) {
error = PTR_ERR(acpi_dev->swnode.properties);
goto err_out;
}
}
acpi_dev++;
}
cros_laptop->acpi_peripherals = acpi_peripherals;
cros_laptop->num_acpi_peripherals = n_peripherals;
return 0;
err_out:
while (--i >= 0) {
acpi_dev = &acpi_peripherals[i];
if (!IS_ERR_OR_NULL(acpi_dev->swnode.properties))
property_entries_free(acpi_dev->swnode.properties);
}
kfree(acpi_peripherals);
return error;
}
static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
{
const struct acpi_peripheral *acpi_dev;
struct i2c_peripheral *i2c_dev;
int i;
for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
i2c_dev = &cros_laptop->i2c_peripherals[i];
i2c_unregister_device(i2c_dev->client);
}
for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
acpi_dev = &cros_laptop->acpi_peripherals[i];
if (acpi_dev->client)
device_remove_software_node(&acpi_dev->client->dev);
property_entries_free(acpi_dev->swnode.properties);
}
kfree(cros_laptop->i2c_peripherals);
kfree(cros_laptop->acpi_peripherals);
kfree(cros_laptop);
}
static struct chromeos_laptop * __init
chromeos_laptop_prepare(const struct chromeos_laptop *src)
{
struct chromeos_laptop *cros_laptop;
int error;
cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
if (!cros_laptop)
return ERR_PTR(-ENOMEM);
error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src);
if (!error)
error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop,
src);
if (error) {
chromeos_laptop_destroy(cros_laptop);
return ERR_PTR(error);
}
return cros_laptop;
}
static int __init chromeos_laptop_init(void)
{
const struct dmi_system_id *dmi_id;
int error;
dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
if (!dmi_id) {
pr_debug("unsupported system\n");
return -ENODEV;
}
pr_debug("DMI Matched %s\n", dmi_id->ident);
cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
if (IS_ERR(cros_laptop))
return PTR_ERR(cros_laptop);
if (!cros_laptop->num_i2c_peripherals &&
!cros_laptop->num_acpi_peripherals) {
pr_debug("no relevant devices detected\n");
error = -ENODEV;
goto err_destroy_cros_laptop;
}
error = bus_register_notifier(&i2c_bus_type,
&chromeos_laptop_i2c_notifier);
if (error) {
pr_err("failed to register i2c bus notifier: %d\n",
error);
goto err_destroy_cros_laptop;
}
/*
* Scan adapters that have been registered and clients that have
* been created before we installed the notifier to make sure
* we do not miss any devices.
*/
i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals);
return 0;
err_destroy_cros_laptop:
chromeos_laptop_destroy(cros_laptop);
return error;
}
static void __exit chromeos_laptop_exit(void)
{
bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
chromeos_laptop_destroy(cros_laptop);
}
module_init(chromeos_laptop_init);
module_exit(chromeos_laptop_exit);
MODULE_DESCRIPTION("Chrome OS Laptop driver");
MODULE_AUTHOR("Benson Leung <[email protected]>");
MODULE_LICENSE("GPL");
Codebase Browser
linux