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path: root/drivers/nfc/pn544/i2c.c
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Diffstat (limited to 'drivers/nfc/pn544/i2c.c')
-rw-r--r--drivers/nfc/pn544/i2c.c221
1 files changed, 43 insertions, 178 deletions
diff --git a/drivers/nfc/pn544/i2c.c b/drivers/nfc/pn544/i2c.c
index f837c39a8017..71ac0836c9f4 100644
--- a/drivers/nfc/pn544/i2c.c
+++ b/drivers/nfc/pn544/i2c.c
@@ -21,17 +21,13 @@
#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/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/nfc.h>
#include <linux/firmware.h>
#include <linux/gpio/consumer.h>
-#include <linux/platform_data/pn544.h>
+
#include <asm/unaligned.h>
#include <net/nfc/hci.h>
@@ -165,8 +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;
@@ -208,19 +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 */
@@ -239,14 +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;
@@ -269,14 +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;
@@ -874,106 +869,20 @@ 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)) {
- nfc_err(dev, "Unable to get EN GPIO\n");
- return -ENODEV;
- }
-
- 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)) {
- nfc_err(dev, "Unable to get FW GPIO\n");
- return -ENODEV;
- }
-
- 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;
- }
-
- /* 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;
- }
- 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;
- }
-
- return 0;
+static const struct acpi_gpio_params enable_gpios = { 1, 0, false };
+static const struct acpi_gpio_params firmware_gpios = { 2, 0, false };
-err_gpio_fw:
- gpio_free(phy->gpio_fw);
-err_gpio_en:
- gpio_free(phy->gpio_en);
-err_dt:
- return ret;
-}
+static const struct acpi_gpio_mapping acpi_pn544_gpios[] = {
+ { "enable-gpios", &enable_gpios, 1 },
+ { "firmware-gpios", &firmware_gpios, 1 },
+ { },
+};
static int pn544_hci_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct device *dev = &client->dev;
struct pn544_i2c_phy *phy;
- struct pn544_nfc_platform_data *pdata;
int r = 0;
dev_dbg(&client->dev, "%s\n", __func__);
@@ -995,53 +904,33 @@ static int pn544_hci_i2c_probe(struct i2c_client *client,
phy->i2c_dev = client;
i2c_set_clientdata(client, phy);
- pdata = client->dev.platform_data;
-
- /* No platform data, using device tree. */
- if (!pdata && client->dev.of_node) {
- r = pn544_hci_i2c_of_request_resources(client);
- if (r) {
- nfc_err(&client->dev, "No DT data\n");
- return r;
- }
- /* Using platform data. */
- } else if (pdata) {
-
- if (pdata->request_resources == NULL) {
- nfc_err(&client->dev, "request_resources() missing\n");
- return -EINVAL;
- }
+ r = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_pn544_gpios);
+ if (r)
+ dev_dbg(dev, "Unable to add GPIO mapping table\n");
- r = pdata->request_resources(client);
- if (r) {
- nfc_err(&client->dev,
- "Cannot get platform resources\n");
- return r;
- }
+ /* Get EN GPIO */
+ phy->gpiod_en = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(phy->gpiod_en)) {
+ nfc_err(dev, "Unable to get EN GPIO\n");
+ return PTR_ERR(phy->gpiod_en);
+ }
- phy->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
- phy->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
- /* Using ACPI */
- } else if (ACPI_HANDLE(&client->dev)) {
- r = pn544_hci_i2c_acpi_request_resources(client);
- if (r) {
- nfc_err(&client->dev,
- "Cannot get ACPI data\n");
- return r;
- }
- } else {
- nfc_err(&client->dev, "No platform data\n");
- return -EINVAL;
+ /* Get FW GPIO */
+ phy->gpiod_fw = devm_gpiod_get(dev, "firmware", GPIOD_OUT_LOW);
+ if (IS_ERR(phy->gpiod_fw)) {
+ nfc_err(dev, "Unable to get FW GPIO\n");
+ return PTR_ERR(phy->gpiod_fw);
}
pn544_hci_i2c_platform_init(phy);
- r = request_threaded_irq(client->irq, NULL, pn544_hci_i2c_irq_thread_fn,
- IRQF_TRIGGER_RISING | IRQF_ONESHOT,
- PN544_HCI_I2C_DRIVER_NAME, phy);
+ r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ pn544_hci_i2c_irq_thread_fn,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ 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,
@@ -1049,28 +938,14 @@ static int pn544_hci_i2c_probe(struct i2c_client *client,
PN544_HCI_I2C_LLC_MAX_PAYLOAD,
pn544_hci_i2c_fw_download, &phy->hdev);
if (r < 0)
- goto err_hci;
+ return r;
return 0;
-
-err_hci:
- free_irq(client->irq, phy);
-
-err_rti:
- if (!pdata) {
- gpio_free(phy->gpio_en);
- gpio_free(phy->gpio_fw);
- } else if (pdata->free_resources) {
- pdata->free_resources();
- }
-
- return r;
}
static int pn544_hci_i2c_remove(struct i2c_client *client)
{
struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
- struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
dev_dbg(&client->dev, "%s\n", __func__);
@@ -1083,17 +958,7 @@ static int pn544_hci_i2c_remove(struct i2c_client *client)
if (phy->powered)
pn544_hci_i2c_disable(phy);
- free_irq(client->irq, phy);
-
- /* No platform data, GPIOs have been requested by this driver */
- if (!pdata) {
- gpio_free(phy->gpio_en);
- gpio_free(phy->gpio_fw);
- /* Using platform data */
- } else if (pdata->free_resources) {
- pdata->free_resources();
- }
-
+ acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev));
return 0;
}
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-04 07:19:32 +0300