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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>
This commit is contained in:
Cédric Le Goater 2017-08-08 15:42:37 +02:00 committed by Jacek Anaszewski
parent 0571753e65
commit ed1f4b9676
1 changed files with 89 additions and 12 deletions
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101
drivers/leds/leds-pca955x.c
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@ -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", &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,