Commit fa4191a6 authored by Phil Reid's avatar Phil Reid Committed by Jacek Anaszewski

leds: pca9532: Add device tree support

This patch adds basic device tree support for the pca9532 LEDs.
Signed-off-by: default avatarPhil Reid <preid@electromag.com.au>
Signed-off-by: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
parent 85c90368
*NXP - pca9532 PWM LED Driver
The PCA9532 family is SMBus I/O expander optimized for dimming LEDs.
The PWM support 256 steps.
Required properties:
- compatible:
"nxp,pca9530"
"nxp,pca9531"
"nxp,pca9532"
"nxp,pca9533"
- reg - I2C slave address
Each led is represented as a sub-node of the nxp,pca9530.
Optional sub-node properties:
- label: see Documentation/devicetree/bindings/leds/common.txt
- type: Output configuration, see dt-bindings/leds/leds-pca9532.h (default NONE)
- linux,default-trigger: see Documentation/devicetree/bindings/leds/common.txt
Example:
#include <dt-bindings/leds/leds-pca9532.h>
leds: pca9530@60 {
compatible = "nxp,pca9530";
reg = <0x60>;
red-power {
label = "pca:red:power";
type = <PCA9532_TYPE_LED>;
};
green-power {
label = "pca:green:power";
type = <PCA9532_TYPE_LED>;
};
};
For more product information please see the link below:
http://nxp.com/documents/data_sheet/PCA9532.pdf
......@@ -21,6 +21,8 @@
#include <linux/workqueue.h>
#include <linux/leds-pca9532.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_device.h>
/* m = num_leds*/
#define PCA9532_REG_INPUT(i) ((i) >> 3)
......@@ -86,9 +88,22 @@ static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
},
};
#ifdef CONFIG_OF
static const struct of_device_id of_pca9532_leds_match[] = {
{ .compatible = "nxp,pca9530", .data = (void *)pca9530 },
{ .compatible = "nxp,pca9531", .data = (void *)pca9531 },
{ .compatible = "nxp,pca9532", .data = (void *)pca9532 },
{ .compatible = "nxp,pca9533", .data = (void *)pca9533 },
{},
};
MODULE_DEVICE_TABLE(of, of_pca9532_leds_match);
#endif
static struct i2c_driver pca9532_driver = {
.driver = {
.name = "leds-pca953x",
.of_match_table = of_match_ptr(of_pca9532_leds_match),
},
.probe = pca9532_probe,
.remove = pca9532_remove,
......@@ -354,6 +369,7 @@ static int pca9532_configure(struct i2c_client *client,
led->state = pled->state;
led->name = pled->name;
led->ldev.name = led->name;
led->ldev.default_trigger = led->default_trigger;
led->ldev.brightness = LED_OFF;
led->ldev.brightness_set_blocking =
pca9532_set_brightness;
......@@ -432,15 +448,66 @@ static int pca9532_configure(struct i2c_client *client,
return err;
}
static struct pca9532_platform_data *
pca9532_of_populate_pdata(struct device *dev, struct device_node *np)
{
struct pca9532_platform_data *pdata;
struct device_node *child;
const struct of_device_id *match;
int devid, maxleds;
int i = 0;
match = of_match_device(of_pca9532_leds_match, dev);
if (!match)
return ERR_PTR(-ENODEV);
devid = (int)(uintptr_t)match->data;
maxleds = pca9532_chip_info_tbl[devid].num_leds;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
for_each_child_of_node(np, child) {
if (of_property_read_string(child, "label",
&pdata->leds[i].name))
pdata->leds[i].name = child->name;
of_property_read_u32(child, "type", &pdata->leds[i].type);
of_property_read_string(child, "linux,default-trigger",
&pdata->leds[i].default_trigger);
if (++i >= maxleds) {
of_node_put(child);
break;
}
}
return pdata;
}
static int pca9532_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int devid;
struct pca9532_data *data = i2c_get_clientdata(client);
struct pca9532_platform_data *pca9532_pdata =
dev_get_platdata(&client->dev);
if (!pca9532_pdata)
return -EIO;
struct device_node *np = client->dev.of_node;
if (!pca9532_pdata) {
if (np) {
pca9532_pdata =
pca9532_of_populate_pdata(&client->dev, np);
if (IS_ERR(pca9532_pdata))
return PTR_ERR(pca9532_pdata);
} else {
dev_err(&client->dev, "no platform data\n");
return -EINVAL;
}
devid = (int)(uintptr_t)of_match_device(
of_pca9532_leds_match, &client->dev)->data;
} else {
devid = id->driver_data;
}
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA))
......@@ -450,7 +517,7 @@ static int pca9532_probe(struct i2c_client *client,
if (!data)
return -ENOMEM;
data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
data->chip_info = &pca9532_chip_info_tbl[devid];
dev_info(&client->dev, "setting platform data\n");
i2c_set_clientdata(client, data);
......
/*
* This header provides constants for pca9532 LED bindings.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#ifndef _DT_BINDINGS_LEDS_PCA9532_H
#define _DT_BINDINGS_LEDS_PCA9532_H
#define PCA9532_TYPE_NONE 0
#define PCA9532_TYPE_LED 1
#define PCA9532_TYPE_N2100_BEEP 2
#define PCA9532_TYPE_GPIO 3
#define PCA9532_LED_TIMER2 4
#endif /* _DT_BINDINGS_LEDS_PCA9532_H */
......@@ -16,6 +16,7 @@
#include <linux/leds.h>
#include <linux/workqueue.h>
#include <dt-bindings/leds/leds-pca9532.h>
enum pca9532_state {
PCA9532_OFF = 0x0,
......@@ -24,16 +25,14 @@ enum pca9532_state {
PCA9532_PWM1 = 0x3
};
enum pca9532_type { PCA9532_TYPE_NONE, PCA9532_TYPE_LED,
PCA9532_TYPE_N2100_BEEP, PCA9532_TYPE_GPIO };
struct pca9532_led {
u8 id;
struct i2c_client *client;
char *name;
const char *name;
const char *default_trigger;
struct led_classdev ldev;
struct work_struct work;
enum pca9532_type type;
u32 type;
enum pca9532_state state;
};
......
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