diff options
Diffstat (limited to 'drivers/platform/x86/intel/int3472/tps68470.c')
| -rw-r--r-- | drivers/platform/x86/intel/int3472/tps68470.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/int3472/tps68470.c b/drivers/platform/x86/intel/int3472/tps68470.c new file mode 100644 index 000000000000..fd3bef449137 --- /dev/null +++ b/drivers/platform/x86/intel/int3472/tps68470.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Author: Dan Scally <djrscally@gmail.com> */ + +#include <linux/i2c.h> +#include <linux/mfd/core.h> +#include <linux/mfd/tps68470.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include "common.h" + +#define DESIGNED_FOR_CHROMEOS 1 +#define DESIGNED_FOR_WINDOWS 2 + +static const struct mfd_cell tps68470_cros[] = { + { .name = "tps68470-gpio" }, + { .name = "tps68470_pmic_opregion" }, +}; + +static const struct mfd_cell tps68470_win[] = { + { .name = "tps68470-gpio" }, + { .name = "tps68470-clk" }, + { .name = "tps68470-regulator" }, +}; + +static const struct regmap_config tps68470_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = TPS68470_REG_MAX, +}; + +static int tps68470_chip_init(struct device *dev, struct regmap *regmap) +{ + unsigned int version; + int ret; + + /* Force software reset */ + ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK); + if (ret) + return ret; + + ret = regmap_read(regmap, TPS68470_REG_REVID, &version); + if (ret) { + dev_err(dev, "Failed to read revision register: %d\n", ret); + return ret; + } + + dev_info(dev, "TPS68470 REVID: 0x%02x\n", version); + + return 0; +} + +/** skl_int3472_tps68470_calc_type: Check what platform a device is designed for + * @adev: A pointer to a &struct acpi_device + * + * Check CLDB buffer against the PMIC's adev. If present, then we check + * the value of control_logic_type field and follow one of the + * following scenarios: + * + * 1. No CLDB - likely ACPI tables designed for ChromeOS. We + * create platform devices for the GPIOs and OpRegion drivers. + * + * 2. CLDB, with control_logic_type = 2 - probably ACPI tables + * made for Windows 2-in-1 platforms. Register pdevs for GPIO, + * Clock and Regulator drivers to bind to. + * + * 3. Any other value in control_logic_type, we should never have + * gotten to this point; fail probe and return. + * + * Return: + * * 1 Device intended for ChromeOS + * * 2 Device intended for Windows + * * -EINVAL Where @adev has an object named CLDB but it does not conform to + * our expectations + */ +static int skl_int3472_tps68470_calc_type(struct acpi_device *adev) +{ + struct int3472_cldb cldb = { 0 }; + int ret; + + /* + * A CLDB buffer that exists, but which does not match our expectations + * should trigger an error so we don't blindly continue. + */ + ret = skl_int3472_fill_cldb(adev, &cldb); + if (ret && ret != -ENODEV) + return ret; + + if (ret) + return DESIGNED_FOR_CHROMEOS; + + if (cldb.control_logic_type != 2) + return -EINVAL; + + return DESIGNED_FOR_WINDOWS; +} + +static int skl_int3472_tps68470_probe(struct i2c_client *client) +{ + struct acpi_device *adev = ACPI_COMPANION(&client->dev); + struct regmap *regmap; + int device_type; + int ret; + + regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Failed to create regmap: %ld\n", PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + i2c_set_clientdata(client, regmap); + + ret = tps68470_chip_init(&client->dev, regmap); + if (ret < 0) { + dev_err(&client->dev, "TPS68470 init error %d\n", ret); + return ret; + } + + device_type = skl_int3472_tps68470_calc_type(adev); + switch (device_type) { + case DESIGNED_FOR_WINDOWS: + ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE, + tps68470_win, ARRAY_SIZE(tps68470_win), + NULL, 0, NULL); + break; + case DESIGNED_FOR_CHROMEOS: + ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE, + tps68470_cros, ARRAY_SIZE(tps68470_cros), + NULL, 0, NULL); + break; + default: + dev_err(&client->dev, "Failed to add MFD devices\n"); + return device_type; + } + + return ret; +} + +static const struct acpi_device_id int3472_device_id[] = { + { "INT3472", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, int3472_device_id); + +static struct i2c_driver int3472_tps68470 = { + .driver = { + .name = "int3472-tps68470", + .acpi_match_table = int3472_device_id, + }, + .probe_new = skl_int3472_tps68470_probe, +}; +module_i2c_driver(int3472_tps68470); + +MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI TPS68470 Device Driver"); +MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>"); +MODULE_LICENSE("GPL v2"); |