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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2017-03-28 12:36:36 +0300
committerSamuel Ortiz <sameo@linux.intel.com>2017-04-05 11:04:12 +0300
commite2c518c6c9987bf832bb1475de38911da96bd3db (patch)
treed45cb7272e0278c1a4bb42dbd76489ba78574d14 /drivers/nfc/pn544/i2c.c
parente7f6ccaab127147c52ac4b624c54ad0059bd08e9 (diff)
downloadlinux-e2c518c6c9987bf832bb1475de38911da96bd3db.tar.xz
NFC: pn544: Convert to use GPIO descriptor
Since we got rid of platform data, the driver may use GPIO descriptor directly. This change fixes a potential issue of double freeing GPIOs in ACPI case by converting to devm_gpiod_get(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/nfc/pn544/i2c.c')
-rw-r--r--drivers/nfc/pn544/i2c.c126
1 files changed, 33 insertions, 93 deletions
diff --git a/drivers/nfc/pn544/i2c.c b/drivers/nfc/pn544/i2c.c
index 4afc92a54444..23485304ce91 100644
--- a/drivers/nfc/pn544/i2c.c
+++ b/drivers/nfc/pn544/i2c.c
@@ -21,9 +21,6 @@
#include <linux/crc-ccitt.h>
#include <linux/module.h>
#include <linux/i2c.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
-#include <linux/of_irq.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
@@ -164,8 +161,9 @@ struct pn544_i2c_phy {
struct i2c_client *i2c_dev;
struct nfc_hci_dev *hdev;
- unsigned int gpio_en;
- unsigned int gpio_fw;
+ struct gpio_desc *gpiod_en;
+ struct gpio_desc *gpiod_fw;
+
unsigned int en_polarity;
u8 hw_variant;
@@ -207,19 +205,18 @@ static void pn544_hci_i2c_platform_init(struct pn544_i2c_phy *phy)
nfc_info(&phy->i2c_dev->dev, "Detecting nfc_en polarity\n");
/* Disable fw download */
- gpio_set_value_cansleep(phy->gpio_fw, 0);
+ gpiod_set_value_cansleep(phy->gpiod_fw, 0);
for (polarity = 0; polarity < 2; polarity++) {
phy->en_polarity = polarity;
retry = 3;
while (retry--) {
/* power off */
- gpio_set_value_cansleep(phy->gpio_en,
- !phy->en_polarity);
+ gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity);
usleep_range(10000, 15000);
/* power on */
- gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity);
+ gpiod_set_value_cansleep(phy->gpiod_en, phy->en_polarity);
usleep_range(10000, 15000);
/* send reset */
@@ -238,14 +235,13 @@ static void pn544_hci_i2c_platform_init(struct pn544_i2c_phy *phy)
"Could not detect nfc_en polarity, fallback to active high\n");
out:
- gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity);
+ gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity);
}
static void pn544_hci_i2c_enable_mode(struct pn544_i2c_phy *phy, int run_mode)
{
- gpio_set_value_cansleep(phy->gpio_fw,
- run_mode == PN544_FW_MODE ? 1 : 0);
- gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity);
+ gpiod_set_value_cansleep(phy->gpiod_fw, run_mode == PN544_FW_MODE ? 1 : 0);
+ gpiod_set_value_cansleep(phy->gpiod_en, phy->en_polarity);
usleep_range(10000, 15000);
phy->run_mode = run_mode;
@@ -268,14 +264,14 @@ static void pn544_hci_i2c_disable(void *phy_id)
{
struct pn544_i2c_phy *phy = phy_id;
- gpio_set_value_cansleep(phy->gpio_fw, 0);
- gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity);
+ gpiod_set_value_cansleep(phy->gpiod_fw, 0);
+ gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity);
usleep_range(10000, 15000);
- gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity);
+ gpiod_set_value_cansleep(phy->gpiod_en, phy->en_polarity);
usleep_range(10000, 15000);
- gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity);
+ gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity);
usleep_range(10000, 15000);
phy->powered = 0;
@@ -876,96 +872,47 @@ exit_state_wait_secure_write_answer:
static int pn544_hci_i2c_acpi_request_resources(struct i2c_client *client)
{
struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
- struct gpio_desc *gpiod_en, *gpiod_fw;
struct device *dev = &client->dev;
/* Get EN GPIO from ACPI */
- gpiod_en = devm_gpiod_get_index(dev, PN544_GPIO_NAME_EN, 1,
- GPIOD_OUT_LOW);
- if (IS_ERR(gpiod_en)) {
+ phy->gpiod_en = devm_gpiod_get_index(dev, PN544_GPIO_NAME_EN, 1,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(phy->gpiod_en)) {
nfc_err(dev, "Unable to get EN GPIO\n");
- return -ENODEV;
+ return PTR_ERR(phy->gpiod_en);
}
- phy->gpio_en = desc_to_gpio(gpiod_en);
-
/* Get FW GPIO from ACPI */
- gpiod_fw = devm_gpiod_get_index(dev, PN544_GPIO_NAME_FW, 2,
- GPIOD_OUT_LOW);
- if (IS_ERR(gpiod_fw)) {
+ phy->gpiod_fw = devm_gpiod_get_index(dev, PN544_GPIO_NAME_FW, 2,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(phy->gpiod_fw)) {
nfc_err(dev, "Unable to get FW GPIO\n");
- return -ENODEV;
+ return PTR_ERR(phy->gpiod_fw);
}
- phy->gpio_fw = desc_to_gpio(gpiod_fw);
-
return 0;
}
static int pn544_hci_i2c_of_request_resources(struct i2c_client *client)
{
struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
- struct device_node *pp;
- int ret;
-
- pp = client->dev.of_node;
- if (!pp) {
- ret = -ENODEV;
- goto err_dt;
- }
-
- /* Obtention of EN GPIO from device tree */
- ret = of_get_named_gpio(pp, "enable-gpios", 0);
- if (ret < 0) {
- if (ret != -EPROBE_DEFER)
- nfc_err(&client->dev,
- "Failed to get EN gpio, error: %d\n", ret);
- goto err_dt;
- }
- phy->gpio_en = ret;
-
- /* Configuration of EN GPIO */
- ret = gpio_request(phy->gpio_en, PN544_GPIO_NAME_EN);
- if (ret) {
- nfc_err(&client->dev, "Fail EN pin\n");
- goto err_dt;
- }
- ret = gpio_direction_output(phy->gpio_en, 0);
- if (ret) {
- nfc_err(&client->dev, "Fail EN pin direction\n");
- goto err_gpio_en;
- }
+ struct device *dev = &client->dev;
- /* Obtention of FW GPIO from device tree */
- ret = of_get_named_gpio(pp, "firmware-gpios", 0);
- if (ret < 0) {
- if (ret != -EPROBE_DEFER)
- nfc_err(&client->dev,
- "Failed to get FW gpio, error: %d\n", ret);
- goto err_gpio_en;
+ /* Obtaining EN GPIO from device tree */
+ phy->gpiod_en = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(phy->gpiod_en)) {
+ nfc_err(dev, "Failed to get EN gpio\n");
+ return PTR_ERR(phy->gpiod_en);
}
- phy->gpio_fw = ret;
- /* Configuration of FW GPIO */
- ret = gpio_request(phy->gpio_fw, PN544_GPIO_NAME_FW);
- if (ret) {
- nfc_err(&client->dev, "Fail FW pin\n");
- goto err_gpio_en;
- }
- ret = gpio_direction_output(phy->gpio_fw, 0);
- if (ret) {
- nfc_err(&client->dev, "Fail FW pin direction\n");
- goto err_gpio_fw;
+ /* Obtaining FW GPIO from device tree */
+ phy->gpiod_fw = devm_gpiod_get(dev, "firmware", GPIOD_OUT_LOW);
+ if (IS_ERR(phy->gpiod_fw)) {
+ nfc_err(dev, "Failed to get FW gpio\n");
+ return PTR_ERR(phy->gpiod_fw);
}
return 0;
-
-err_gpio_fw:
- gpio_free(phy->gpio_fw);
-err_gpio_en:
- gpio_free(phy->gpio_en);
-err_dt:
- return ret;
}
static int pn544_hci_i2c_probe(struct i2c_client *client,
@@ -1020,7 +967,7 @@ static int pn544_hci_i2c_probe(struct i2c_client *client,
PN544_HCI_I2C_DRIVER_NAME, phy);
if (r < 0) {
nfc_err(&client->dev, "Unable to register IRQ handler\n");
- goto err_rti;
+ return r;
}
r = pn544_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
@@ -1035,10 +982,6 @@ static int pn544_hci_i2c_probe(struct i2c_client *client,
err_hci:
free_irq(client->irq, phy);
-err_rti:
- gpio_free(phy->gpio_en);
- gpio_free(phy->gpio_fw);
-
return r;
}
@@ -1059,9 +1002,6 @@ static int pn544_hci_i2c_remove(struct i2c_client *client)
free_irq(client->irq, phy);
- gpio_free(phy->gpio_en);
- gpio_free(phy->gpio_fw);
-
return 0;
}