Commit d966c943 authored by Tony Makkiel's avatar Tony Makkiel Committed by Jacek Anaszewski

leds: LED driver for TI LP3952 6-Channel Color LED

The chip can drive 2 sets of RGB leds. Controller can
be controlled via PWM, I2C and audio synchronisation.
This driver uses I2C to communicate with the chip.

Datasheet: http://www.ti.com/lit/gpn/lp3952Signed-off-by: default avatarTony Makkiel <tony.makkiel@daqri.com>
Reviewed-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarAxel Lin <axel.lin@ingics.com>
Signed-off-by: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
parent bff23714
......@@ -228,6 +228,20 @@ config LEDS_LP3944
To compile this driver as a module, choose M here: the
module will be called leds-lp3944.
config LEDS_LP3952
tristate "LED Support for TI LP3952 2 channel LED driver"
depends on LEDS_CLASS
depends on I2C
depends on ACPI
depends on GPIOLIB
select REGMAP_I2C
help
This option enables support for LEDs connected to the Texas
Instruments LP3952 LED driver.
To compile this driver as a module, choose M here: the
module will be called leds-lp3952.
config LEDS_LP55XX_COMMON
tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
......
......@@ -26,6 +26,7 @@ obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
obj-$(CONFIG_LEDS_LP3952) += leds-lp3952.o
obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
......
/*
* 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/acpi.h>
#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)
strncpy(dest, str, LP3952_LABEL_MAX_LEN);
return ret;
}
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},
{}
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id lp3952_acpi_match[] = {
{"TXNW3952", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, lp3952_acpi_match);
#endif
static struct i2c_driver lp3952_i2c_driver = {
.driver = {
.name = LP3952_NAME,
.acpi_match_table = ACPI_PTR(lp3952_acpi_match),
},
.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");
/*
* 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.
*
*/
#ifndef LEDS_LP3952_H_
#define LEDS_LP3952_H_
#define LP3952_NAME "lp3952"
#define LP3952_CMD_REG_COUNT 8
#define LP3952_BRIGHT_MAX 4
#define LP3952_LABEL_MAX_LEN 15
#define LP3952_REG_LED_CTRL 0x00
#define LP3952_REG_R1_BLNK_TIME_CTRL 0x01
#define LP3952_REG_R1_BLNK_CYCLE_CTRL 0x02
#define LP3952_REG_G1_BLNK_TIME_CTRL 0x03
#define LP3952_REG_G1_BLNK_CYCLE_CTRL 0x04
#define LP3952_REG_B1_BLNK_TIME_CTRL 0x05
#define LP3952_REG_B1_BLNK_CYCLE_CTRL 0x06
#define LP3952_REG_ENABLES 0x0B
#define LP3952_REG_PAT_GEN_CTRL 0x11
#define LP3952_REG_RGB1_MAX_I_CTRL 0x12
#define LP3952_REG_RGB2_MAX_I_CTRL 0x13
#define LP3952_REG_CMD_0 0x50
#define LP3952_REG_RESET 0x60
#define REG_MAX LP3952_REG_RESET
#define LP3952_PATRN_LOOP BIT(1)
#define LP3952_PATRN_GEN_EN BIT(2)
#define LP3952_INT_B00ST_LDR BIT(2)
#define LP3952_ACTIVE_MODE BIT(6)
#define LP3952_LED_MASK_ALL 0x3f
/* Transition Time in ms */
enum lp3952_tt {
TT0,
TT55,
TT110,
TT221,
TT422,
TT885,
TT1770,
TT3539
};
/* Command Execution Time in ms */
enum lp3952_cet {
CET197,
CET393,
CET590,
CET786,
CET1180,
CET1376,
CET1573,
CET1769,
CET1966,
CET2163,
CET2359,
CET2556,
CET2763,
CET2949,
CET3146
};
/* Max Current in % */
enum lp3952_colour_I_log_0 {
I0,
I7,
I14,
I21,
I32,
I46,
I71,
I100
};
enum lp3952_leds {
LP3952_BLUE_2,
LP3952_GREEN_2,
LP3952_RED_2,
LP3952_BLUE_1,
LP3952_GREEN_1,
LP3952_RED_1,
LP3952_LED_ALL
};
struct lp3952_ctrl_hdl {
struct led_classdev cdev;
char name[LP3952_LABEL_MAX_LEN];
enum lp3952_leds channel;
void *priv;
};
struct ptrn_gen_cmd {
union {
struct {
u16 tt:3;
u16 b:3;
u16 cet:4;
u16 g:3;
u16 r:3;
};
struct {
u8 lsb;
u8 msb;
} bytes;
};
} __packed;
struct lp3952_led_array {
struct regmap *regmap;
struct i2c_client *client;
struct gpio_desc *enable_gpio;
struct lp3952_ctrl_hdl leds[LP3952_LED_ALL];
};
#endif /* LEDS_LP3952_H_ */
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