f4363d8107
Instead of unusual "if (!ret)" use "if (ret)" in lp3952_get_label(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
292 lines
6.8 KiB
C
292 lines
6.8 KiB
C
/*
|
|
* LED driver for TI lp3952 controller
|
|
*
|
|
* Copyright (C) 2016, DAQRI, LLC.
|
|
* Author: Tony Makkiel <tony.makkiel@daqri.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/leds-lp3952.h>
|
|
#include <linux/module.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/regmap.h>
|
|
|
|
static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val)
|
|
{
|
|
int ret;
|
|
struct lp3952_led_array *priv = i2c_get_clientdata(client);
|
|
|
|
ret = regmap_write(priv->regmap, reg, val);
|
|
|
|
if (ret)
|
|
dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
|
|
__func__, reg, val, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void lp3952_on_off(struct lp3952_led_array *priv,
|
|
enum lp3952_leds led_id, bool on)
|
|
{
|
|
int ret, val;
|
|
|
|
dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on);
|
|
|
|
val = 1 << led_id;
|
|
if (led_id == LP3952_LED_ALL)
|
|
val = LP3952_LED_MASK_ALL;
|
|
|
|
ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val,
|
|
on ? val : 0);
|
|
if (ret)
|
|
dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret);
|
|
}
|
|
|
|
/*
|
|
* Using Imax to control brightness. There are 4 possible
|
|
* setting 25, 50, 75 and 100 % of Imax. Possible values are
|
|
* values 0-4. 0 meaning turn off.
|
|
*/
|
|
static int lp3952_set_brightness(struct led_classdev *cdev,
|
|
enum led_brightness value)
|
|
{
|
|
unsigned int reg, shift_val;
|
|
struct lp3952_ctrl_hdl *led = container_of(cdev,
|
|
struct lp3952_ctrl_hdl,
|
|
cdev);
|
|
struct lp3952_led_array *priv = (struct lp3952_led_array *)led->priv;
|
|
|
|
dev_dbg(cdev->dev, "Brightness request: %d on %d\n", value,
|
|
led->channel);
|
|
|
|
if (value == LED_OFF) {
|
|
lp3952_on_off(priv, led->channel, false);
|
|
return 0;
|
|
}
|
|
|
|
if (led->channel > LP3952_RED_1) {
|
|
dev_err(cdev->dev, " %s Invalid LED requested", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (led->channel >= LP3952_BLUE_1) {
|
|
reg = LP3952_REG_RGB1_MAX_I_CTRL;
|
|
shift_val = (led->channel - LP3952_BLUE_1) * 2;
|
|
} else {
|
|
reg = LP3952_REG_RGB2_MAX_I_CTRL;
|
|
shift_val = led->channel * 2;
|
|
}
|
|
|
|
/* Enable the LED in case it is not enabled already */
|
|
lp3952_on_off(priv, led->channel, true);
|
|
|
|
return regmap_update_bits(priv->regmap, reg, 3 << shift_val,
|
|
--value << shift_val);
|
|
}
|
|
|
|
static int lp3952_get_label(struct device *dev, const char *label, char *dest)
|
|
{
|
|
int ret;
|
|
const char *str;
|
|
|
|
ret = device_property_read_string(dev, label, &str);
|
|
if (ret)
|
|
return ret;
|
|
|
|
strncpy(dest, str, LP3952_LABEL_MAX_LEN);
|
|
return 0;
|
|
}
|
|
|
|
static int lp3952_register_led_classdev(struct lp3952_led_array *priv)
|
|
{
|
|
int i, acpi_ret, ret = -ENODEV;
|
|
static const char *led_name_hdl[LP3952_LED_ALL] = {
|
|
"blue2",
|
|
"green2",
|
|
"red2",
|
|
"blue1",
|
|
"green1",
|
|
"red1"
|
|
};
|
|
|
|
for (i = 0; i < LP3952_LED_ALL; i++) {
|
|
acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i],
|
|
priv->leds[i].name);
|
|
if (acpi_ret)
|
|
continue;
|
|
|
|
priv->leds[i].cdev.name = priv->leds[i].name;
|
|
priv->leds[i].cdev.brightness = LED_OFF;
|
|
priv->leds[i].cdev.max_brightness = LP3952_BRIGHT_MAX;
|
|
priv->leds[i].cdev.brightness_set_blocking =
|
|
lp3952_set_brightness;
|
|
priv->leds[i].channel = i;
|
|
priv->leds[i].priv = priv;
|
|
|
|
ret = devm_led_classdev_register(&priv->client->dev,
|
|
&priv->leds[i].cdev);
|
|
if (ret < 0) {
|
|
dev_err(&priv->client->dev,
|
|
"couldn't register LED %s\n",
|
|
priv->leds[i].cdev.name);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int lp3952_set_pattern_gen_cmd(struct lp3952_led_array *priv,
|
|
u8 cmd_index, u8 r, u8 g, u8 b,
|
|
enum lp3952_tt tt, enum lp3952_cet cet)
|
|
{
|
|
int ret;
|
|
struct ptrn_gen_cmd line = {
|
|
{
|
|
{
|
|
.r = r,
|
|
.g = g,
|
|
.b = b,
|
|
.cet = cet,
|
|
.tt = tt
|
|
}
|
|
}
|
|
};
|
|
|
|
if (cmd_index >= LP3952_CMD_REG_COUNT)
|
|
return -EINVAL;
|
|
|
|
ret = lp3952_register_write(priv->client,
|
|
LP3952_REG_CMD_0 + cmd_index * 2,
|
|
line.bytes.msb);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return lp3952_register_write(priv->client,
|
|
LP3952_REG_CMD_0 + cmd_index * 2 + 1,
|
|
line.bytes.lsb);
|
|
}
|
|
|
|
static int lp3952_configure(struct lp3952_led_array *priv)
|
|
{
|
|
int ret;
|
|
|
|
/* Disable any LEDs on from any previous conf. */
|
|
ret = lp3952_register_write(priv->client, LP3952_REG_LED_CTRL, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* enable rgb patter, loop */
|
|
ret = lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL,
|
|
LP3952_PATRN_LOOP | LP3952_PATRN_GEN_EN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Update Bit 6 (Active mode), Select both Led sets, Bit [1:0] */
|
|
ret = lp3952_register_write(priv->client, LP3952_REG_ENABLES,
|
|
LP3952_ACTIVE_MODE | LP3952_INT_B00ST_LDR);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Set Cmd1 for RGB intensity,cmd and transition time */
|
|
return lp3952_set_pattern_gen_cmd(priv, 0, I46, I71, I100, TT0,
|
|
CET197);
|
|
}
|
|
|
|
static const struct regmap_config lp3952_regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = REG_MAX,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static int lp3952_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int status;
|
|
struct lp3952_led_array *priv;
|
|
|
|
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->client = client;
|
|
|
|
priv->enable_gpio = devm_gpiod_get(&client->dev, "nrst",
|
|
GPIOD_OUT_HIGH);
|
|
if (IS_ERR(priv->enable_gpio)) {
|
|
status = PTR_ERR(priv->enable_gpio);
|
|
dev_err(&client->dev, "Failed to enable gpio: %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap);
|
|
if (IS_ERR(priv->regmap)) {
|
|
int err = PTR_ERR(priv->regmap);
|
|
|
|
dev_err(&client->dev, "Failed to allocate register map: %d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
i2c_set_clientdata(client, priv);
|
|
|
|
status = lp3952_configure(priv);
|
|
if (status) {
|
|
dev_err(&client->dev, "Probe failed. Device not found (%d)\n",
|
|
status);
|
|
return status;
|
|
}
|
|
|
|
status = lp3952_register_led_classdev(priv);
|
|
if (status) {
|
|
dev_err(&client->dev, "Unable to register led_classdev: %d\n",
|
|
status);
|
|
return status;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lp3952_remove(struct i2c_client *client)
|
|
{
|
|
struct lp3952_led_array *priv;
|
|
|
|
priv = i2c_get_clientdata(client);
|
|
lp3952_on_off(priv, LP3952_LED_ALL, false);
|
|
gpiod_set_value(priv->enable_gpio, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lp3952_id[] = {
|
|
{LP3952_NAME, 0},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lp3952_id);
|
|
|
|
static struct i2c_driver lp3952_i2c_driver = {
|
|
.driver = {
|
|
.name = LP3952_NAME,
|
|
},
|
|
.probe = lp3952_probe,
|
|
.remove = lp3952_remove,
|
|
.id_table = lp3952_id,
|
|
};
|
|
|
|
module_i2c_driver(lp3952_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Tony Makkiel <tony.makkiel@daqri.com>");
|
|
MODULE_DESCRIPTION("lp3952 I2C LED controller driver");
|
|
MODULE_LICENSE("GPL v2");
|