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path: root/drivers/char/tpm/st33zp24/spi.c
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Diffstat (limited to 'drivers/char/tpm/st33zp24/spi.c')
-rw-r--r--drivers/char/tpm/st33zp24/spi.c145
1 files changed, 3 insertions, 142 deletions
diff --git a/drivers/char/tpm/st33zp24/spi.c b/drivers/char/tpm/st33zp24/spi.c
index 22d184884694..2154059f0235 100644
--- a/drivers/char/tpm/st33zp24/spi.c
+++ b/drivers/char/tpm/st33zp24/spi.c
@@ -6,13 +6,9 @@
#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/of.h>
#include <linux/acpi.h>
#include <linux/tpm.h>
-#include <linux/platform_data/st33zp24.h>
#include "../tpm.h"
#include "st33zp24.h"
@@ -61,7 +57,6 @@ struct st33zp24_spi_phy {
u8 tx_buf[ST33ZP24_SPI_BUFFER_SIZE];
u8 rx_buf[ST33ZP24_SPI_BUFFER_SIZE];
- int io_lpcpd;
int latency;
};
@@ -218,115 +213,6 @@ 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);
- struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
- struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
- struct gpio_desc *gpiod_lpcpd;
- struct device *dev = &spi_dev->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(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 spi_device *spi_dev)
-{
- struct tpm_chip *chip = spi_get_drvdata(spi_dev);
- struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
- struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
- struct device_node *pp;
- int gpio;
- int ret;
-
- pp = spi_dev->dev.of_node;
- if (!pp) {
- dev_err(&spi_dev->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(&spi_dev->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(&spi_dev->dev, gpio,
- GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
- if (ret) {
- dev_err(&spi_dev->dev, "Failed to request lpcpd pin\n");
- return -ENODEV;
- }
- phy->io_lpcpd = gpio;
-
- return 0;
-}
-
-static int st33zp24_spi_request_resources(struct spi_device *dev)
-{
- struct tpm_chip *chip = spi_get_drvdata(dev);
- struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
- struct st33zp24_spi_phy *phy = tpm_dev->phy_id;
- struct st33zp24_platform_data *pdata;
- int ret;
-
- pdata = dev->dev.platform_data;
- if (!pdata) {
- dev_err(&dev->dev, "No platform data\n");
- return -ENODEV;
- }
-
- /* store for late use */
- phy->io_lpcpd = pdata->io_lpcpd;
-
- if (gpio_is_valid(pdata->io_lpcpd)) {
- ret = devm_gpio_request_one(&dev->dev,
- pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
- "TPM IO_LPCPD");
- if (ret) {
- dev_err(&dev->dev, "%s : reset gpio_request failed\n",
- __FILE__);
- return ret;
- }
- }
-
- return 0;
-}
-
/*
* st33zp24_spi_probe initialize the TPM device
* @param: dev, the spi_device description (TPM SPI description).
@@ -335,17 +221,8 @@ static int st33zp24_spi_request_resources(struct spi_device *dev)
*/
static int st33zp24_spi_probe(struct spi_device *dev)
{
- int ret;
- struct st33zp24_platform_data *pdata;
struct st33zp24_spi_phy *phy;
- /* Check SPI platform functionnalities */
- if (!dev) {
- pr_info("%s: dev is NULL. Device is not accessible.\n",
- __func__);
- return -ENODEV;
- }
-
phy = devm_kzalloc(&dev->dev, sizeof(struct st33zp24_spi_phy),
GFP_KERNEL);
if (!phy)
@@ -353,27 +230,11 @@ static int st33zp24_spi_probe(struct spi_device *dev)
phy->spi_device = dev;
- pdata = dev->dev.platform_data;
- if (!pdata && dev->dev.of_node) {
- ret = st33zp24_spi_of_request_resources(dev);
- if (ret)
- return ret;
- } else if (pdata) {
- ret = st33zp24_spi_request_resources(dev);
- if (ret)
- return ret;
- } else if (ACPI_HANDLE(&dev->dev)) {
- ret = st33zp24_spi_acpi_request_resources(dev);
- if (ret)
- return ret;
- }
-
phy->latency = st33zp24_spi_evaluate_latency(phy);
if (phy->latency <= 0)
return -ENODEV;
- return st33zp24_probe(phy, &spi_phy_ops, &dev->dev, dev->irq,
- phy->io_lpcpd);
+ return st33zp24_probe(phy, &spi_phy_ops, &dev->dev, dev->irq);
}
/*
@@ -411,7 +272,7 @@ static SIMPLE_DEV_PM_OPS(st33zp24_spi_ops, st33zp24_pm_suspend,
static struct spi_driver st33zp24_spi_driver = {
.driver = {
- .name = TPM_ST33_SPI,
+ .name = "st33zp24-spi",
.pm = &st33zp24_spi_ops,
.of_match_table = of_match_ptr(of_st33zp24_spi_match),
.acpi_match_table = ACPI_PTR(st33zp24_spi_acpi_match),