leds: pca955x: add device tree support
It will be used in a following patch to define different operation
modes for each pin.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index 9a87311..2d34009 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -41,14 +41,17 @@
*/
#include <linux/acpi.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/string.h>
#include <linux/ctype.h>
-#include <linux/leds.h>
+#include <linux/delay.h>
#include <linux/err.h>
+#include <linux/gpio.h>
#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
#include <linux/slab.h>
+#include <linux/string.h>
/* LED select registers determine the source that drives LED outputs */
#define PCA955X_LS_LED_ON 0x0 /* Output LOW */
@@ -122,6 +125,12 @@ struct pca955x_led {
struct led_classdev led_cdev;
int led_num; /* 0 .. 15 potentially */
char name[32];
+ const char *default_trigger;
+};
+
+struct pca955x_platform_data {
+ struct pca955x_led *leds;
+ int num_leds;
};
/* 8 bits per input register */
@@ -250,6 +259,70 @@ static int pca955x_led_set(struct led_classdev *led_cdev,
return 0;
}
+#if IS_ENABLED(CONFIG_OF)
+static struct pca955x_platform_data *
+pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
+{
+ struct device_node *np = client->dev.of_node;
+ struct device_node *child;
+ struct pca955x_platform_data *pdata;
+ int count;
+
+ count = of_get_child_count(np);
+ if (!count || count > chip->bits)
+ return ERR_PTR(-ENODEV);
+
+ pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->leds = devm_kzalloc(&client->dev,
+ sizeof(struct pca955x_led) * chip->bits,
+ GFP_KERNEL);
+ if (!pdata->leds)
+ return ERR_PTR(-ENOMEM);
+
+ for_each_child_of_node(np, child) {
+ const char *name;
+ u32 reg;
+ int res;
+
+ res = of_property_read_u32(child, "reg", ®);
+ if ((res != 0) || (reg >= chip->bits))
+ continue;
+
+ if (of_property_read_string(child, "label", &name))
+ name = child->name;
+
+ snprintf(pdata->leds[reg].name, sizeof(pdata->leds[reg].name),
+ "%s", name);
+
+ of_property_read_string(child, "linux,default-trigger",
+ &pdata->leds[reg].default_trigger);
+ }
+
+ pdata->num_leds = chip->bits;
+
+ return pdata;
+}
+
+static const struct of_device_id of_pca955x_match[] = {
+ { .compatible = "nxp,pca9550", .data = (void *)pca9550 },
+ { .compatible = "nxp,pca9551", .data = (void *)pca9551 },
+ { .compatible = "nxp,pca9552", .data = (void *)pca9552 },
+ { .compatible = "nxp,pca9553", .data = (void *)pca9553 },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, of_pca955x_match);
+#else
+static struct pca955x_platform_data *
+pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif
+
static int pca955x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -257,8 +330,8 @@ static int pca955x_probe(struct i2c_client *client,
struct pca955x_led *pca955x_led;
struct pca955x_chipdef *chip;
struct i2c_adapter *adapter;
- struct led_platform_data *pdata;
int i, err;
+ struct pca955x_platform_data *pdata;
if (id) {
chip = &pca955x_chipdefs[id->driver_data];
@@ -272,6 +345,11 @@ static int pca955x_probe(struct i2c_client *client,
}
adapter = to_i2c_adapter(client->dev.parent);
pdata = dev_get_platdata(&client->dev);
+ if (!pdata) {
+ pdata = pca955x_pdata_of_init(client, chip);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ }
/* Make sure the slave address / chip type combo given is possible */
if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
@@ -288,13 +366,11 @@ static int pca955x_probe(struct i2c_client *client,
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
- if (pdata) {
- if (pdata->num_leds != chip->bits) {
- dev_err(&client->dev, "board info claims %d LEDs"
- " on a %d-bit chip\n",
- pdata->num_leds, chip->bits);
- return -ENODEV;
- }
+ if (pdata->num_leds != chip->bits) {
+ dev_err(&client->dev,
+ "board info claims %d LEDs on a %d-bit chip\n",
+ pdata->num_leds, chip->bits);
+ return -ENODEV;
}
pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
@@ -378,6 +454,7 @@ static struct i2c_driver pca955x_driver = {
.driver = {
.name = "leds-pca955x",
.acpi_match_table = ACPI_PTR(pca955x_acpi_ids),
+ .of_match_table = of_match_ptr(of_pca955x_match),
},
.probe = pca955x_probe,
.remove = pca955x_remove,