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path: root/drivers/nfc/st21nfca/i2c.c
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Diffstat (limited to 'drivers/nfc/st21nfca/i2c.c')
-rw-r--r--drivers/nfc/st21nfca/i2c.c74
1 files changed, 21 insertions, 53 deletions
diff --git a/drivers/nfc/st21nfca/i2c.c b/drivers/nfc/st21nfca/i2c.c
index 02a920ca07c8..cd1f7bfa75eb 100644
--- a/drivers/nfc/st21nfca/i2c.c
+++ b/drivers/nfc/st21nfca/i2c.c
@@ -61,8 +61,6 @@
#define ST21NFCA_HCI_DRIVER_NAME "st21nfca_hci"
#define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c"
-#define ST21NFCA_GPIO_NAME_EN "enable"
-
struct st21nfca_i2c_phy {
struct i2c_client *i2c_dev;
struct nfc_hci_dev *hdev;
@@ -171,16 +169,16 @@ static void st21nfca_hci_add_len_crc(struct sk_buff *skb)
u16 crc;
u8 tmp;
- *skb_push(skb, 1) = 0;
+ *(u8 *)skb_push(skb, 1) = 0;
crc = crc_ccitt(0xffff, skb->data, skb->len);
crc = ~crc;
tmp = crc & 0x00ff;
- *skb_put(skb, 1) = tmp;
+ skb_put_u8(skb, tmp);
tmp = (crc >> 8) & 0x00ff;
- *skb_put(skb, 1) = tmp;
+ skb_put_u8(skb, tmp);
}
static void st21nfca_hci_remove_len_crc(struct sk_buff *skb)
@@ -214,9 +212,9 @@ static int st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb)
st21nfca_hci_add_len_crc(skb);
/* add ST21NFCA_SOF_EOF on tail */
- *skb_put(skb, 1) = ST21NFCA_SOF_EOF;
+ skb_put_u8(skb, ST21NFCA_SOF_EOF);
/* add ST21NFCA_SOF_EOF on head */
- *skb_push(skb, 1) = ST21NFCA_SOF_EOF;
+ *(u8 *)skb_push(skb, 1) = ST21NFCA_SOF_EOF;
/*
* Compute byte stuffing
@@ -407,7 +405,7 @@ static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy,
phy->current_read_len = 0;
}
- memcpy(skb_put(skb, len), buf, len);
+ skb_put_data(skb, buf, len);
if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) {
phy->current_read_len = 0;
@@ -501,41 +499,17 @@ static struct nfc_phy_ops i2c_phy_ops = {
.disable = st21nfca_hci_i2c_disable,
};
-static int st21nfca_hci_i2c_acpi_request_resources(struct i2c_client *client)
-{
- struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
- struct device *dev = &client->dev;
-
- /* Get EN GPIO from ACPI */
- phy->gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 1,
- GPIOD_OUT_LOW);
- if (IS_ERR(phy->gpiod_ena)) {
- nfc_err(dev, "Unable to get ENABLE GPIO\n");
- return PTR_ERR(phy->gpiod_ena);
- }
-
- return 0;
-}
-
-static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
-{
- struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
- struct device *dev = &client->dev;
-
- /* Get GPIO from device tree */
- phy->gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 0,
- GPIOD_OUT_HIGH);
- if (IS_ERR(phy->gpiod_ena)) {
- nfc_err(dev, "Failed to request enable pin\n");
- return PTR_ERR(phy->gpiod_ena);
- }
+static const struct acpi_gpio_params enable_gpios = { 1, 0, false };
- return 0;
-}
+static const struct acpi_gpio_mapping acpi_st21nfca_gpios[] = {
+ { "enable-gpios", &enable_gpios, 1 },
+ {},
+};
static int st21nfca_hci_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct device *dev = &client->dev;
struct st21nfca_i2c_phy *phy;
int r;
@@ -562,21 +536,15 @@ static int st21nfca_hci_i2c_probe(struct i2c_client *client,
mutex_init(&phy->phy_lock);
i2c_set_clientdata(client, phy);
- if (client->dev.of_node) {
- r = st21nfca_hci_i2c_of_request_resources(client);
- if (r) {
- nfc_err(&client->dev, "No platform data\n");
- return r;
- }
- } else if (ACPI_HANDLE(&client->dev)) {
- r = st21nfca_hci_i2c_acpi_request_resources(client);
- if (r) {
- nfc_err(&client->dev, "Cannot get ACPI data\n");
- return r;
- }
- } else {
- nfc_err(&client->dev, "st21nfca platform resources not available\n");
- return -ENODEV;
+ r = devm_acpi_dev_add_driver_gpios(dev, acpi_st21nfca_gpios);
+ if (r)
+ dev_dbg(dev, "Unable to add GPIO mapping table\n");
+
+ /* Get EN GPIO from resource provider */
+ phy->gpiod_ena = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(phy->gpiod_ena)) {
+ nfc_err(dev, "Unable to get ENABLE GPIO\n");
+ return PTR_ERR(phy->gpiod_ena);
}
phy->se_status.is_ese_present =