tpm/st33zp24: Add GPIO ACPI mapping table

In order to make GPIO ACPI library stricter prepare users of
gpiod_get_index() to correctly behave when there no mapping is
provided by firmware.

Here we add explicit mapping between _CRS GpioIo() resources and
their names used in the driver.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c
index 028a9cd..1b10e38 100644 (file)
--- a/drivers/char/tpm/st33zp24/i2c.c
+++ b/drivers/char/tpm/st33zp24/i2c.c
@@ -111,6 +111,13 @@ 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);
@@ -118,10 +125,14 @@ static int st33zp24_i2c_acpi_request_resources(struct i2c_client *client)
        struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
        struct gpio_desc *gpiod_lpcpd;
        struct device *dev = &client->dev;
+       int ret;
+
+       ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_st33zp24_gpios);
+       if (ret)
+               return ret;
 
        /* Get LPCPD GPIO from ACPI */
-       gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
-                                          GPIOD_OUT_HIGH);
+       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");
@@ -268,8 +279,14 @@ static int st33zp24_i2c_probe(struct i2c_client *client,
 static int st33zp24_i2c_remove(struct i2c_client *client)
 {
        struct tpm_chip *chip = i2c_get_clientdata(client);
+       int ret;
 
-       return st33zp24_remove(chip);
+       ret = st33zp24_remove(chip);
+       if (ret)
+               return ret;
+
+       acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev));
+       return 0;
 }
 
 static const struct i2c_device_id st33zp24_i2c_id[] = {

diff --git a/drivers/char/tpm/st33zp24/spi.c b/drivers/char/tpm/st33zp24/spi.c
index 9f5a011..c69d151 100644 (file)
--- a/drivers/char/tpm/st33zp24/spi.c
+++ b/drivers/char/tpm/st33zp24/spi.c
@@ -230,6 +230,13 @@ static const struct st33zp24_phy_ops spi_phy_ops = {
        .recv = st33zp24_spi_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_spi_acpi_request_resources(struct spi_device *spi_dev)
 {
        struct tpm_chip *chip = spi_get_drvdata(spi_dev);
@@ -237,10 +244,14 @@ static int st33zp24_spi_acpi_request_resources(struct spi_device *spi_dev)
        struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
        struct gpio_desc *gpiod_lpcpd;
        struct device *dev = &spi_dev->dev;
+       int ret;
+
+       ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_st33zp24_gpios);
+       if (ret)
+               return ret;
 
        /* Get LPCPD GPIO from ACPI */
-       gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
-                                          GPIOD_OUT_HIGH);
+       gpiod_lpcpd = devm_gpiod_get(dev, "lpcpd", GPIOD_OUT_HIGH);
        if (IS_ERR(gpiod_lpcpd)) {
                dev_err(dev, "Failed to retrieve lpcpd-gpios from acpi.\n");
                phy->io_lpcpd = -1;
@@ -385,8 +396,14 @@ static int st33zp24_spi_probe(struct spi_device *dev)
 static int st33zp24_spi_remove(struct spi_device *dev)
 {
        struct tpm_chip *chip = spi_get_drvdata(dev);
+       int ret;
 
-       return st33zp24_remove(chip);
+       ret = st33zp24_remove(chip);
+       if (ret)
+               return ret;
+
+       acpi_dev_remove_driver_gpios(ACPI_COMPANION(&dev->dev));
+       return 0;
 }
 
 static const struct spi_device_id st33zp24_spi_id[] = {