From 3f8019093775cc338c8e895bc9a41f4922766de6 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Fri, 30 Sep 2022 22:51:41 -0700 Subject: tpm: st33zp24: switch to using gpiod API Switch the driver from legacy gpio API (that uses flat GPIO numbering) to the newer gpiod API (which used descriptors and respects line polarities specified in ACPI or device tree). Because gpio handling code for SPI and I2C variants duplicates each other it is moved into the core code for the driver. Also, it seems that the driver never assigned tpm_dev->io_lpcpd in the past, so gpio-based power management was most likely not working ever. Signed-off-by: Dmitry Torokhov Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/st33zp24/i2c.c | 101 +--------------------------------------- 1 file changed, 2 insertions(+), 99 deletions(-) (limited to 'drivers/char/tpm/st33zp24/i2c.c') diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c index c560532647c8..614c7d8ed84f 100644 --- a/drivers/char/tpm/st33zp24/i2c.c +++ b/drivers/char/tpm/st33zp24/i2c.c @@ -6,10 +6,7 @@ #include #include -#include -#include -#include -#include +#include #include #include @@ -21,7 +18,6 @@ struct st33zp24_i2c_phy { struct i2c_client *client; u8 buf[ST33ZP24_BUFSIZE + 1]; - int io_lpcpd; }; /* @@ -98,85 +94,6 @@ static const struct st33zp24_phy_ops i2c_phy_ops = { .recv = st33zp24_i2c_recv, }; -static const struct acpi_gpio_params lpcpd_gpios = { 1, 0, false }; - -static const struct acpi_gpio_mapping acpi_st33zp24_gpios[] = { - { "lpcpd-gpios", &lpcpd_gpios, 1 }, - {}, -}; - -static int st33zp24_i2c_acpi_request_resources(struct i2c_client *client) -{ - struct tpm_chip *chip = i2c_get_clientdata(client); - struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev); - struct st33zp24_i2c_phy *phy = tpm_dev->phy_id; - struct gpio_desc *gpiod_lpcpd; - struct device *dev = &client->dev; - int ret; - - ret = devm_acpi_dev_add_driver_gpios(dev, acpi_st33zp24_gpios); - if (ret) - return ret; - - /* Get LPCPD GPIO from ACPI */ - gpiod_lpcpd = devm_gpiod_get(dev, "lpcpd", 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 i2c_client *client) -{ - struct tpm_chip *chip = i2c_get_clientdata(client); - struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev); - struct st33zp24_i2c_phy *phy = tpm_dev->phy_id; - struct device_node *pp; - int gpio; - int ret; - - pp = client->dev.of_node; - if (!pp) { - dev_err(&client->dev, "No platform data\n"); - return -ENODEV; - } - - /* Get GPIO from device tree */ - gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0); - if (gpio < 0) { - dev_err(&client->dev, - "Failed to retrieve lpcpd-gpios from dts.\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; - } - /* GPIO request and configuration */ - ret = devm_gpio_request_one(&client->dev, gpio, - GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD"); - if (ret) { - dev_err(&client->dev, "Failed to request lpcpd pin\n"); - return -ENODEV; - } - phy->io_lpcpd = gpio; - - return 0; -} - /* * st33zp24_i2c_probe initialize the TPM device * @param: client, the i2c_client description (TPM I2C description). @@ -187,7 +104,6 @@ static int st33zp24_i2c_of_request_resources(struct i2c_client *client) static int st33zp24_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { - int ret; struct st33zp24_i2c_phy *phy; if (!client) { @@ -208,20 +124,7 @@ static int st33zp24_i2c_probe(struct i2c_client *client, phy->client = client; - if (client->dev.of_node) { - ret = st33zp24_i2c_of_request_resources(client); - if (ret) - return ret; - } else if (ACPI_HANDLE(&client->dev)) { - ret = st33zp24_i2c_acpi_request_resources(client); - if (ret) - return ret; - } else { - return -ENODEV; - } - - return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq, - phy->io_lpcpd); + return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq); } /* -- cgit