diff options
| -rw-r--r-- | drivers/char/tpm/st33zp24/spi.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/char/tpm/st33zp24/spi.c b/drivers/char/tpm/st33zp24/spi.c index eb351ba48689..173db725b535 100644 --- a/drivers/char/tpm/st33zp24/spi.c +++ b/drivers/char/tpm/st33zp24/spi.c @@ -19,8 +19,10 @@ #include <linux/module.h> #include <linux/spi/spi.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> @@ -227,6 +229,42 @@ static const struct st33zp24_phy_ops spi_phy_ops = { .recv = st33zp24_spi_recv, }; +static int st33zp24_spi_acpi_request_resources(struct st33zp24_spi_phy *phy) +{ + struct spi_device *spi_dev = phy->spi_device; + const struct acpi_device_id *id; + struct gpio_desc *gpiod_lpcpd; + struct device *dev; + + if (!spi_dev) + return -EINVAL; + + dev = &spi_dev->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(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_spi_of_request_resources(struct st33zp24_spi_phy *phy) { struct device_node *pp; @@ -328,6 +366,10 @@ static int st33zp24_spi_probe(struct spi_device *dev) ret = st33zp24_spi_request_resources(dev, phy); if (ret) return ret; + } else if (ACPI_HANDLE(&dev->dev)) { + ret = st33zp24_spi_acpi_request_resources(phy); + if (ret) + return ret; } phy->latency = st33zp24_spi_evaluate_latency(phy); @@ -362,6 +404,12 @@ static const struct of_device_id of_st33zp24_spi_match[] = { }; MODULE_DEVICE_TABLE(of, of_st33zp24_spi_match); +static const struct acpi_device_id st33zp24_spi_acpi_match[] = { + {"SMO3324"}, + {} +}; +MODULE_DEVICE_TABLE(acpi, st33zp24_spi_acpi_match); + static SIMPLE_DEV_PM_OPS(st33zp24_spi_ops, st33zp24_pm_suspend, st33zp24_pm_resume); @@ -370,6 +418,7 @@ static struct spi_driver st33zp24_spi_driver = { .name = TPM_ST33_SPI, .pm = &st33zp24_spi_ops, .of_match_table = of_match_ptr(of_st33zp24_spi_match), + .acpi_match_table = ACPI_PTR(st33zp24_spi_acpi_match), }, .probe = st33zp24_spi_probe, .remove = st33zp24_spi_remove, |