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NFC: dts: st21nfca: Add device-tree (Open Firmware) support to st21nfca

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Add functions to recover hardware resources from the device-tree
when not provided by the platform data.

Based on pn544 devicetree implementation

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Christophe Ricard 2014-05-13 22:03:39 +02:00 committed by Samuel Ortiz
parent 0515829642
commit c44cb2edd0
1 changed files with 87 additions and 19 deletions
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106
drivers/nfc/st21nfca/i2c.c
View file

@ -21,6 +21,8 @@
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
@ -502,11 +504,65 @@ static struct nfc_phy_ops i2c_phy_ops = {
.disable = st21nfca_hci_i2c_disable,
};
#ifdef CONFIG_OF
static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
{
struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
struct device_node *pp;
int gpio;
int r;
pp = client->dev.of_node;
if (!pp)
return -ENODEV;
/* Get GPIO from device tree */
gpio = of_get_named_gpio(pp, "enable-gpios", 0);
if (gpio < 0) {
nfc_err(&client->dev, "Failed to retrieve enable-gpios from device tree\n");
return gpio;
}
/* GPIO request and configuration */
r = devm_gpio_request(&client->dev, gpio, "clf_enable");
if (r) {
nfc_err(&client->dev, "Failed to request enable pin\n");
return -ENODEV;
}
r = gpio_direction_output(gpio, 1);
if (r) {
nfc_err(&client->dev, "Failed to set enable pin direction as output\n");
return -ENODEV;
}
phy->gpio_ena = gpio;
/* IRQ */
r = irq_of_parse_and_map(pp, 0);
if (r < 0) {
nfc_err(&client->dev,
"Unable to get irq, error: %d\n", r);
return r;
}
phy->irq_polarity = irq_get_trigger_type(r);
client->irq = r;
return 0;
}
#else
static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
{
return -ENODEV;
}
#endif
static int st21nfca_hci_i2c_request_resources(struct i2c_client *client)
{
struct st21nfca_nfc_platform_data *pdata;
struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
int r;
int irq;
pdata = client->dev.platform_data;
if (pdata == NULL) {
@ -547,6 +603,16 @@ static int st21nfca_hci_i2c_request_resources(struct i2c_client *client)
}
}
/* IRQ */
irq = gpio_to_irq(phy->gpio_irq);
if (irq < 0) {
nfc_err(&client->dev,
"Unable to get irq number for GPIO %d error %d\n",
phy->gpio_irq, r);
return -ENODEV;
}
client->irq = irq;
return 0;
}
@ -556,7 +622,6 @@ static int st21nfca_hci_i2c_probe(struct i2c_client *client,
struct st21nfca_i2c_phy *phy;
struct st21nfca_nfc_platform_data *pdata;
int r;
int irq;
dev_dbg(&client->dev, "%s\n", __func__);
dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
@ -585,26 +650,22 @@ static int st21nfca_hci_i2c_probe(struct i2c_client *client,
i2c_set_clientdata(client, phy);
pdata = client->dev.platform_data;
if (!pdata) {
nfc_err(&client->dev, "No platform data\n");
return -EINVAL;
}
r = st21nfca_hci_i2c_request_resources(client);
if (r) {
nfc_err(&client->dev, "Cannot get platform resources\n");
return r;
}
/* IRQ */
irq = gpio_to_irq(phy->gpio_irq);
if (irq < 0) {
nfc_err(&client->dev,
"Unable to get irq number for GPIO %d error %d\n",
phy->gpio_irq, r);
if (!pdata && 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 (pdata) {
r = st21nfca_hci_i2c_request_resources(client);
if (r) {
nfc_err(&client->dev, "Cannot get platform resources\n");
return r;
}
} else {
nfc_err(&client->dev, "st21nfca platform resources not available\n");
return -ENODEV;
}
client->irq = irq;
r = st21nfca_hci_platform_init(phy);
if (r < 0) {
@ -640,10 +701,17 @@ static int st21nfca_hci_i2c_remove(struct i2c_client *client)
return 0;
}
static const struct of_device_id of_st21nfca_i2c_match[] = {
{ .compatible = "st,st21nfca_i2c", },
{}
};
static struct i2c_driver st21nfca_hci_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = ST21NFCA_HCI_I2C_DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(of_st21nfca_i2c_match),
},
.probe = st21nfca_hci_i2c_probe,
.id_table = st21nfca_hci_i2c_id_table,