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/*
* 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");
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