diff options
| -rw-r--r-- | drivers/char/tpm/st33zp24/i2c.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c index a49b6f1..b20cc2b 100644 --- a/drivers/char/tpm/st33zp24/i2c.c +++ b/drivers/char/tpm/st33zp24/i2c.c @@ -19,8 +19,10 @@ #include <linux/module.h> #include <linux/i2c.h> #include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/of_irq.h> #include <linux/of_gpio.h> +#include <linux/acpi.h> #include <linux/tpm.h> #include <linux/platform_data/st33zp24.h> @@ -108,6 +110,43 @@ static const struct st33zp24_phy_ops i2c_phy_ops = { .recv = st33zp24_i2c_recv, }; +static int st33zp24_i2c_acpi_request_resources(struct st33zp24_i2c_phy *phy) +{ + struct i2c_client *client = phy->client; + const struct acpi_device_id *id; + struct gpio_desc *gpiod_lpcpd; + struct device *dev; + + if (!client) + return -EINVAL; + + dev = &client->dev; + + /* Match the struct device against a given list of ACPI IDs */ + id = acpi_match_device(dev->driver->acpi_match_table, dev); + if (!id) + return -ENODEV; + + /* Get LPCPD GPIO from ACPI */ + gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1, + GPIOD_OUT_HIGH); + if (IS_ERR(gpiod_lpcpd)) { + dev_err(&client->dev, + "Failed to retrieve lpcpd-gpios from acpi.\n"); + phy->io_lpcpd = -1; + /* + * lpcpd pin is not specified. This is not an issue as + * power management can be also managed by TPM specific + * commands. So leave with a success status code. + */ + return 0; + } + + phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd); + + return 0; +} + static int st33zp24_i2c_of_request_resources(struct st33zp24_i2c_phy *phy) { struct device_node *pp; @@ -214,6 +253,10 @@ static int st33zp24_i2c_probe(struct i2c_client *client, ret = st33zp24_i2c_request_resources(client, phy); if (ret) return ret; + } else if (ACPI_HANDLE(&client->dev)) { + ret = st33zp24_i2c_acpi_request_resources(phy); + if (ret) + return ret; } return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq, @@ -244,6 +287,12 @@ static const struct of_device_id of_st33zp24_i2c_match[] = { }; MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match); +static const struct acpi_device_id st33zp24_i2c_acpi_match[] = { + {"SMO3324"}, + {} +}; +MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match); + static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend, st33zp24_pm_resume); @@ -252,6 +301,7 @@ static struct i2c_driver st33zp24_i2c_driver = { .name = TPM_ST33_I2C, .pm = &st33zp24_i2c_ops, .of_match_table = of_match_ptr(of_st33zp24_i2c_match), + .acpi_match_table = ACPI_PTR(st33zp24_i2c_acpi_match), }, .probe = st33zp24_i2c_probe, .remove = st33zp24_i2c_remove, |