diff options
Diffstat (limited to 'drivers/platform/x86/intel_cht_int33fe.c')
| -rw-r--r-- | drivers/platform/x86/intel_cht_int33fe.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c new file mode 100644 index 000000000000..6a1b2ca5b6fe --- /dev/null +++ b/drivers/platform/x86/intel_cht_int33fe.c @@ -0,0 +1,143 @@ +/* + * Intel Cherry Trail ACPI INT33FE pseudo device driver + * + * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Some Intel Cherry Trail based device which ship with Windows 10, have + * this weird INT33FE ACPI device with a CRS table with 4 I2cSerialBusV2 + * resources, for 4 different chips attached to various i2c busses: + * 1. The Whiskey Cove pmic, which is also described by the INT34D3 ACPI device + * 2. Maxim MAX17047 Fuel Gauge Controller + * 3. FUSB302 USB Type-C Controller + * 4. PI3USB30532 USB switch + * + * So this driver is a stub / pseudo driver whose only purpose is to + * instantiate i2c-clients for chips 2 - 4, so that standard i2c drivers + * for these chips can bind to the them. + */ + +#include <linux/acpi.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/slab.h> + +#define EXPECTED_PTYPE 4 + +struct cht_int33fe_data { + struct i2c_client *max17047; + struct i2c_client *fusb302; + struct i2c_client *pi3usb30532; +}; + +static int cht_int33fe_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct i2c_board_info board_info; + struct cht_int33fe_data *data; + unsigned long long ptyp; + acpi_status status; + int fusb302_irq; + + status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp); + if (ACPI_FAILURE(status)) { + dev_err(dev, "Error getting PTYPE\n"); + return -ENODEV; + } + + /* + * The same ACPI HID is used for different configurations check PTYP + * to ensure that we are dealing with the expected config. + */ + if (ptyp != EXPECTED_PTYPE) + return -ENODEV; + + /* The FUSB302 uses the irq at index 1 and is the only irq user */ + fusb302_irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 1); + if (fusb302_irq < 0) { + if (fusb302_irq != -EPROBE_DEFER) + dev_err(dev, "Error getting FUSB302 irq\n"); + return fusb302_irq; + } + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + memset(&board_info, 0, sizeof(board_info)); + strlcpy(board_info.type, "max17047", I2C_NAME_SIZE); + + data->max17047 = i2c_acpi_new_device(dev, 1, &board_info); + if (!data->max17047) + return -EPROBE_DEFER; /* Wait for the i2c-adapter to load */ + + memset(&board_info, 0, sizeof(board_info)); + strlcpy(board_info.type, "fusb302", I2C_NAME_SIZE); + board_info.irq = fusb302_irq; + + data->fusb302 = i2c_acpi_new_device(dev, 2, &board_info); + if (!data->fusb302) + goto out_unregister_max17047; + + memset(&board_info, 0, sizeof(board_info)); + strlcpy(board_info.type, "pi3usb30532", I2C_NAME_SIZE); + + data->pi3usb30532 = i2c_acpi_new_device(dev, 3, &board_info); + if (!data->pi3usb30532) + goto out_unregister_fusb302; + + i2c_set_clientdata(client, data); + + return 0; + +out_unregister_fusb302: + i2c_unregister_device(data->fusb302); + +out_unregister_max17047: + i2c_unregister_device(data->max17047); + + return -EPROBE_DEFER; /* Wait for the i2c-adapter to load */ +} + +static int cht_int33fe_remove(struct i2c_client *i2c) +{ + struct cht_int33fe_data *data = i2c_get_clientdata(i2c); + + i2c_unregister_device(data->pi3usb30532); + i2c_unregister_device(data->fusb302); + i2c_unregister_device(data->max17047); + + return 0; +} + +static const struct i2c_device_id cht_int33fe_i2c_id[] = { + { } +}; +MODULE_DEVICE_TABLE(i2c, cht_int33fe_i2c_id); + +static const struct acpi_device_id cht_int33fe_acpi_ids[] = { + { "INT33FE", }, + { } +}; +MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids); + +static struct i2c_driver cht_int33fe_driver = { + .driver = { + .name = "Intel Cherry Trail ACPI INT33FE driver", + .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids), + }, + .probe_new = cht_int33fe_probe, + .remove = cht_int33fe_remove, + .id_table = cht_int33fe_i2c_id, + .disable_i2c_core_irq_mapping = true, +}; + +module_i2c_driver(cht_int33fe_driver); + +MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver"); +MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); +MODULE_LICENSE("GPL"); |