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LED updates for 4.18-rc1

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Merge tag 'leds_for_4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds

Pull LED updates from Jacek Anaszewski:
 "This was quite a fruitful cycle, taking into account usual traffic on
  linux-leds list, as we managed to merge three new LED class drivers.

  New LED class drivers with related DT bindings:
   - add LED driver for CR0014114 board
   - add Spreadtrum SC27xx breathing light controller driver
   - introduce the lm3601x LED driver

  LED class fix:
   - ensure workqueue is initialized before setting brightness

  Improvements and fixes to existing LED class drivers:
   - fix return value check in sc27xx_led_probe()
   - use sysfs_match_string() helper in wm831x_status_src_store()"

* tag 'leds_for_4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  leds: class: ensure workqueue is initialized before setting brightness
  leds: lm3601x: Introduce the lm3601x LED driver
  dt: bindings: lm3601x: Introduce the lm3601x driver
  leds: sc27xx: Fix return value check in sc27xx_led_probe()
  leds: Add Spreadtrum SC27xx breathing light controller driver
  dt-bindings: leds: Add SC27xx breathing light controller documentation
  leds: wm831x-status: Use sysfs_match_string() helper
  leds: add LED driver for CR0014114 board
  dt-bindings: Add vendor prefix and docs for CR0014114
This commit is contained in:
Linus Torvalds 2018-06-05 16:07:55 -07:00
commit 5231804cf9
11 changed files with 1237 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
Documentation/devicetree/bindings/leds/leds-cr0014114.txt Normal file
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@ -0,0 +1,54 @@
Crane Merchandising System - cr0014114 LED driver
-------------------------------------------------
This LED Board is widely used in vending machines produced
by Crane Merchandising Systems.
Required properties:
- compatible: "crane,cr0014114"
Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt
apply. In particular, "reg" and "spi-max-frequency" properties must be given.
LED sub-node properties:
- label :
see Documentation/devicetree/bindings/leds/common.txt
- linux,default-trigger : (optional)
see Documentation/devicetree/bindings/leds/common.txt
Example
-------
led-controller@0 {
compatible = "crane,cr0014114";
reg = <0>;
spi-max-frequency = <50000>;
#address-cells = <1>;
#size-cells = <0>;
led@0 {
reg = <0>;
label = "red:coin";
};
led@1 {
reg = <1>;
label = "green:coin";
};
led@2 {
reg = <2>;
label = "blue:coin";
};
led@3 {
reg = <3>;
label = "red:bill";
};
led@4 {
reg = <4>;
label = "green:bill";
};
led@5 {
reg = <5>;
label = "blue:bill";
};
...
};

45
Documentation/devicetree/bindings/leds/leds-lm3601x.txt Normal file
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@ -0,0 +1,45 @@
* Texas Instruments - lm3601x Single-LED Flash Driver
The LM3601X are ultra-small LED flash drivers that
provide a high level of adjustability.
Required properties:
- compatible : Can be one of the following
"ti,lm36010"
"ti,lm36011"
- reg : I2C slave address
- #address-cells : 1
- #size-cells : 0
Required child properties:
- reg : 0 - Indicates a IR mode
1 - Indicates a Torch (white LED) mode
Required properties for flash LED child nodes:
See Documentation/devicetree/bindings/leds/common.txt
- flash-max-microamp : Range from 11mA - 1.5A
- flash-max-timeout-us : Range from 40ms - 1600ms
- led-max-microamp : Range from 2.4mA - 376mA
Optional child properties:
- label : see Documentation/devicetree/bindings/leds/common.txt
Example:
led-controller@64 {
compatible = "ti,lm36010";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x64>;
led@0 {
reg = <1>;
label = "white:torch";
led-max-microamp = <376000>;
flash-max-microamp = <1500000>;
flash-max-timeout-us = <1600000>;
};
}
For more product information please see the links below:
http://www.ti.com/product/LM36010
http://www.ti.com/product/LM36011

41
Documentation/devicetree/bindings/leds/leds-sc27xx-bltc.txt Normal file
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@ -0,0 +1,41 @@
LEDs connected to Spreadtrum SC27XX PMIC breathing light controller
The SC27xx breathing light controller supports to 3 outputs:
red LED, green LED and blue LED. Each LED can work at normal
PWM mode or breath light mode.
Required properties:
- compatible: Should be "sprd,sc2731-bltc".
- #address-cells: Must be 1.
- #size-cells: Must be 0.
- reg: Specify the controller address.
Required child properties:
- reg: Port this LED is connected to.
Optional child properties:
- label: See Documentation/devicetree/bindings/leds/common.txt.
Examples:
led-controller@200 {
compatible = "sprd,sc2731-bltc";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x200>;
led@0 {
label = "red";
reg = <0x0>;
};
led@1 {
label = "green";
reg = <0x1>;
};
led@2 {
label = "blue";
reg = <0x2>;
};
};

1
Documentation/devicetree/bindings/vendor-prefixes.txt
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@ -75,6 +75,7 @@ cnxt Conexant Systems, Inc.
compulab CompuLab Ltd.
cortina Cortina Systems, Inc.
cosmic Cosmic Circuits
crane Crane Connectivity Solutions
creative Creative Technology Ltd
crystalfontz Crystalfontz America, Inc.
cubietech Cubietech, Ltd.

33
drivers/leds/Kconfig
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@ -104,6 +104,19 @@ config LEDS_CPCAP
This option enables support for LEDs offered by Motorola's
CPCAP PMIC.
config LEDS_CR0014114
tristate "LED Support for Crane CR0014114"
depends on LEDS_CLASS
depends on SPI
depends on OF
help
This option enables support for CR0014114 LED Board which
is widely used in vending machines produced by
Crane Merchandising Systems.
To compile this driver as a module, choose M here: the module
will be called leds-cr0014114.
config LEDS_LM3530
tristate "LCD Backlight driver for LM3530"
depends on LEDS_CLASS
@ -145,6 +158,15 @@ config LEDS_LM3692X
This option enables support for the TI LM3692x family
of white LED string drivers used for backlighting.
config LEDS_LM3601X
tristate "LED support for LM3601x Chips"
depends on LEDS_CLASS && I2C
depends on LEDS_CLASS_FLASH
select REGMAP_I2C
help
This option enables support for the TI LM3601x family
of flash, torch and indicator classes.
config LEDS_LOCOMO
tristate "LED Support for Locomo device"
depends on LEDS_CLASS
@ -647,6 +669,17 @@ config LEDS_IS31FL32XX
LED controllers. They are I2C devices with multiple constant-current
channels, each with independent 256-level PWM control.
config LEDS_SC27XX_BLTC
tristate "LED support for the SC27xx breathing light controller"
depends on LEDS_CLASS && MFD_SC27XX_PMIC
depends on OF
help
Say Y here to include support for the SC27xx breathing light controller
LEDs.
This driver can also be built as a module. If so the module will be
called leds-sc27xx-bltc.
comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
config LEDS_BLINKM

3
drivers/leds/Makefile
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@ -76,8 +76,11 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
# LED Userspace Drivers

10
drivers/leds/led-class.c
View File

@ -260,10 +260,14 @@ int of_led_classdev_register(struct device *parent, struct device_node *np,
if (ret < 0)
return ret;
mutex_init(&led_cdev->led_access);
mutex_lock(&led_cdev->led_access);
led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
led_cdev, led_cdev->groups, "%s", name);
if (IS_ERR(led_cdev->dev))
if (IS_ERR(led_cdev->dev)) {
mutex_unlock(&led_cdev->led_access);
return PTR_ERR(led_cdev->dev);
}
led_cdev->dev->of_node = np;
if (ret)
@ -274,6 +278,7 @@ int of_led_classdev_register(struct device *parent, struct device_node *np,
ret = led_add_brightness_hw_changed(led_cdev);
if (ret) {
device_unregister(led_cdev->dev);
mutex_unlock(&led_cdev->led_access);
return ret;
}
}
@ -285,7 +290,6 @@ int of_led_classdev_register(struct device *parent, struct device_node *np,
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
led_cdev->brightness_hw_changed = -1;
#endif
mutex_init(&led_cdev->led_access);
/* add to the list of leds */
down_write(&leds_list_lock);
list_add_tail(&led_cdev->node, &leds_list);
@ -302,6 +306,8 @@ int of_led_classdev_register(struct device *parent, struct device_node *np,
led_trigger_set_default(led_cdev);
#endif
mutex_unlock(&led_cdev->led_access);
dev_dbg(parent, "Registered led device: %s\n",
led_cdev->name);

315
drivers/leds/leds-cr0014114.c Normal file
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@ -0,0 +1,315 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Crane Merchandising Systems. All rights reserved.
// Copyright (C) 2018 Oleh Kravchenko <oleg@kaa.org.ua>
#include <linux/delay.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/spi/spi.h>
#include <linux/workqueue.h>
#include <uapi/linux/uleds.h>
/*
* CR0014114 SPI protocol descrtiption:
* +----+-----------------------------------+----+
* | CMD| BRIGHTNESS |CRC |
* +----+-----------------------------------+----+
* | | LED0| LED1| LED2| LED3| LED4| LED5| |
* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
* | |R|G|B|R|G|B|R|G|B|R|G|B|R|G|B|R|G|B| |
* | 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1 |
* | |1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1| |
* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
* | | 18 | |
* +----+-----------------------------------+----+
* | 20 |
* +---------------------------------------------+
*
* PS: Boards can be connected to the chain:
* SPI -> board0 -> board1 -> board2 ..
*/
/* CR0014114 SPI commands */
#define CR_SET_BRIGHTNESS 0x80
#define CR_INIT_REENUMERATE 0x81
#define CR_NEXT_REENUMERATE 0x82
/* CR0014114 default settings */
#define CR_MAX_BRIGHTNESS GENMASK(6, 0)
#define CR_FW_DELAY_MSEC 10
#define CR_RECOUNT_DELAY (HZ * 3600)
struct cr0014114_led {
char name[LED_MAX_NAME_SIZE];
struct cr0014114 *priv;
struct led_classdev ldev;
u8 brightness;
};
struct cr0014114 {
bool do_recount;
size_t count;
struct delayed_work work;
struct device *dev;
struct mutex lock;
struct spi_device *spi;
u8 *buf;
unsigned long delay;
struct cr0014114_led leds[];
};
static void cr0014114_calc_crc(u8 *buf, const size_t len)
{
size_t i;
u8 crc;
for (i = 1, crc = 1; i < len - 1; i++)
crc += buf[i];
crc |= BIT(7);
/* special case when CRC matches the SPI commands */
if (crc == CR_SET_BRIGHTNESS ||
crc == CR_INIT_REENUMERATE ||
crc == CR_NEXT_REENUMERATE)
crc = 0xfe;
buf[len - 1] = crc;
}
static int cr0014114_recount(struct cr0014114 *priv)
{
int ret;
size_t i;
u8 cmd;
dev_dbg(priv->dev, "LEDs recount is started\n");
cmd = CR_INIT_REENUMERATE;
ret = spi_write(priv->spi, &cmd, sizeof(cmd));
if (ret)
goto err;
cmd = CR_NEXT_REENUMERATE;
for (i = 0; i < priv->count; i++) {
msleep(CR_FW_DELAY_MSEC);
ret = spi_write(priv->spi, &cmd, sizeof(cmd));
if (ret)
goto err;
}
err:
dev_dbg(priv->dev, "LEDs recount is finished\n");
if (ret)
dev_err(priv->dev, "with error %d", ret);
return ret;
}
static int cr0014114_sync(struct cr0014114 *priv)
{
int ret;
size_t i;
unsigned long udelay, now = jiffies;
/* to avoid SPI mistiming with firmware we should wait some time */
if (time_after(priv->delay, now)) {
udelay = jiffies_to_usecs(priv->delay - now);
usleep_range(udelay, udelay + 1);
}
if (unlikely(priv->do_recount)) {
ret = cr0014114_recount(priv);
if (ret)
goto err;
priv->do_recount = false;
msleep(CR_FW_DELAY_MSEC);
}
priv->buf[0] = CR_SET_BRIGHTNESS;
for (i = 0; i < priv->count; i++)
priv->buf[i + 1] = priv->leds[i].brightness;
cr0014114_calc_crc(priv->buf, priv->count + 2);
ret = spi_write(priv->spi, priv->buf, priv->count + 2);
err:
priv->delay = jiffies + msecs_to_jiffies(CR_FW_DELAY_MSEC);
return ret;
}
static void cr0014114_recount_work(struct work_struct *work)
{
int ret;
struct cr0014114 *priv = container_of(work,
struct cr0014114,
work.work);
mutex_lock(&priv->lock);
priv->do_recount = true;
ret = cr0014114_sync(priv);
mutex_unlock(&priv->lock);
if (ret)
dev_warn(priv->dev, "sync of LEDs failed %d\n", ret);
schedule_delayed_work(&priv->work, CR_RECOUNT_DELAY);
}
static int cr0014114_set_sync(struct led_classdev *ldev,
enum led_brightness brightness)
{
int ret;
struct cr0014114_led *led = container_of(ldev,
struct cr0014114_led,
ldev);
dev_dbg(led->priv->dev, "Set brightness of %s to %d\n",
led->name, brightness);
mutex_lock(&led->priv->lock);
led->brightness = (u8)brightness;
ret = cr0014114_sync(led->priv);
mutex_unlock(&led->priv->lock);
return ret;
}
static int cr0014114_probe_dt(struct cr0014114 *priv)
{
size_t i = 0;
struct cr0014114_led *led;
struct fwnode_handle *child;
struct device_node *np;
int ret;
const char *str;
device_for_each_child_node(priv->dev, child) {
np = to_of_node(child);
led = &priv->leds[i];
ret = fwnode_property_read_string(child, "label", &str);
if (ret)
snprintf(led->name, sizeof(led->name),
"cr0014114::");
else
snprintf(led->name, sizeof(led->name),
"cr0014114:%s", str);
fwnode_property_read_string(child, "linux,default-trigger",
&led->ldev.default_trigger);
led->priv = priv;
led->ldev.name = led->name;
led->ldev.max_brightness = CR_MAX_BRIGHTNESS;
led->ldev.brightness_set_blocking = cr0014114_set_sync;
ret = devm_of_led_classdev_register(priv->dev, np,
&led->ldev);
if (ret) {
dev_err(priv->dev,
"failed to register LED device %s, err %d",
led->name, ret);
fwnode_handle_put(child);
return ret;
}
led->ldev.dev->of_node = np;
i++;
}
return 0;
}
static int cr0014114_probe(struct spi_device *spi)
{
struct cr0014114 *priv;
size_t count;
int ret;
count = device_get_child_node_count(&spi->dev);
if (!count) {
dev_err(&spi->dev, "LEDs are not defined in device tree!");
return -ENODEV;
}
priv = devm_kzalloc(&spi->dev,
sizeof(*priv) + sizeof(*priv->leds) * count,
GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->buf = devm_kzalloc(&spi->dev, count + 2, GFP_KERNEL);
if (!priv->buf)
return -ENOMEM;
mutex_init(&priv->lock);
INIT_DELAYED_WORK(&priv->work, cr0014114_recount_work);
priv->count = count;
priv->dev = &spi->dev;
priv->spi = spi;
priv->delay = jiffies -
msecs_to_jiffies(CR_FW_DELAY_MSEC);
priv->do_recount = true;
ret = cr0014114_sync(priv);
if (ret) {
dev_err(priv->dev, "first recount failed %d\n", ret);
return ret;
}
priv->do_recount = true;
ret = cr0014114_sync(priv);
if (ret) {
dev_err(priv->dev, "second recount failed %d\n", ret);
return ret;
}
ret = cr0014114_probe_dt(priv);
if (ret)
return ret;
/* setup recount work to workaround buggy firmware */
schedule_delayed_work(&priv->work, CR_RECOUNT_DELAY);
spi_set_drvdata(spi, priv);
return 0;
}
static int cr0014114_remove(struct spi_device *spi)
{
struct cr0014114 *priv = spi_get_drvdata(spi);
cancel_delayed_work_sync(&priv->work);
mutex_destroy(&priv->lock);
return 0;
}
static const struct of_device_id cr0014114_dt_ids[] = {
{ .compatible = "crane,cr0014114", },
{},
};
MODULE_DEVICE_TABLE(of, cr0014114_dt_ids);
static struct spi_driver cr0014114_driver = {
.probe = cr0014114_probe,
.remove = cr0014114_remove,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = cr0014114_dt_ids,
},
};
module_spi_driver(cr0014114_driver);
MODULE_AUTHOR("Oleh Kravchenko <oleg@kaa.org.ua>");
MODULE_DESCRIPTION("cr0014114 LED driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:cr0014114");

487
drivers/leds/leds-lm3601x.c Normal file
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@ -0,0 +1,487 @@
// SPDX-License-Identifier: GPL-2.0
// Flash and torch driver for Texas Instruments LM3601X LED
// Flash driver chip family
// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <uapi/linux/uleds.h>
#define LM3601X_LED_IR 0x0
#define LM3601X_LED_TORCH 0x1
/* Registers */
#define LM3601X_ENABLE_REG 0x01
#define LM3601X_CFG_REG 0x02
#define LM3601X_LED_FLASH_REG 0x03
#define LM3601X_LED_TORCH_REG 0x04
#define LM3601X_FLAGS_REG 0x05
#define LM3601X_DEV_ID_REG 0x06
#define LM3601X_SW_RESET BIT(7)
/* Enable Mode bits */
#define LM3601X_MODE_STANDBY 0x00
#define LM3601X_MODE_IR_DRV BIT(0)
#define LM3601X_MODE_TORCH BIT(1)
#define LM3601X_MODE_STROBE (BIT(0) | BIT(1))
#define LM3601X_STRB_EN BIT(2)
#define LM3601X_STRB_EDGE_TRIG BIT(3)
#define LM3601X_IVFM_EN BIT(4)
#define LM36010_BOOST_LIMIT_28 BIT(5)
#define LM36010_BOOST_FREQ_4MHZ BIT(6)
#define LM36010_BOOST_MODE_PASS BIT(7)
/* Flag Mask */
#define LM3601X_FLASH_TIME_OUT BIT(0)
#define LM3601X_UVLO_FAULT BIT(1)
#define LM3601X_THERM_SHUTDOWN BIT(2)
#define LM3601X_THERM_CURR BIT(3)
#define LM36010_CURR_LIMIT BIT(4)
#define LM3601X_SHORT_FAULT BIT(5)
#define LM3601X_IVFM_TRIP BIT(6)
#define LM36010_OVP_FAULT BIT(7)
#define LM3601X_MAX_TORCH_I_UA 376000
#define LM3601X_MIN_TORCH_I_UA 2400
#define LM3601X_TORCH_REG_DIV 2965
#define LM3601X_MAX_STROBE_I_UA 1500000
#define LM3601X_MIN_STROBE_I_UA 11000
#define LM3601X_STROBE_REG_DIV 11800
#define LM3601X_TIMEOUT_MASK 0x1e
#define LM3601X_ENABLE_MASK (LM3601X_MODE_IR_DRV | LM3601X_MODE_TORCH)
#define LM3601X_LOWER_STEP_US 40000
#define LM3601X_UPPER_STEP_US 200000
#define LM3601X_MIN_TIMEOUT_US 40000
#define LM3601X_MAX_TIMEOUT_US 1600000
#define LM3601X_TIMEOUT_XOVER_US 400000
enum lm3601x_type {
CHIP_LM36010 = 0,
CHIP_LM36011,
};
/**
* struct lm3601x_led -
* @fled_cdev: flash LED class device pointer
* @client: Pointer to the I2C client
* @regmap: Devices register map
* @lock: Lock for reading/writing the device
* @led_name: LED label for the Torch or IR LED
* @flash_timeout: the timeout for the flash
* @last_flag: last known flags register value
* @torch_current_max: maximum current for the torch
* @flash_current_max: maximum current for the flash
* @max_flash_timeout: maximum timeout for the flash
* @led_mode: The mode to enable either IR or Torch
*/
struct lm3601x_led {
struct led_classdev_flash fled_cdev;
struct i2c_client *client;
struct regmap *regmap;
struct mutex lock;
char led_name[LED_MAX_NAME_SIZE];
unsigned int flash_timeout;
unsigned int last_flag;
u32 torch_current_max;
u32 flash_current_max;
u32 max_flash_timeout;
u32 led_mode;
};
static const struct reg_default lm3601x_regmap_defs[] = {
{ LM3601X_ENABLE_REG, 0x20 },
{ LM3601X_CFG_REG, 0x15 },
{ LM3601X_LED_FLASH_REG, 0x00 },
{ LM3601X_LED_TORCH_REG, 0x00 },
};
static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case LM3601X_FLAGS_REG:
return true;
default:
return false;
}
}
static const struct regmap_config lm3601x_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LM3601X_DEV_ID_REG,
.reg_defaults = lm3601x_regmap_defs,
.num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs),
.cache_type = REGCACHE_RBTREE,
.volatile_reg = lm3601x_volatile_reg,
};
static struct lm3601x_led *fled_cdev_to_led(struct led_classdev_flash *fled_cdev)
{
return container_of(fled_cdev, struct lm3601x_led, fled_cdev);
}
static int lm3601x_read_faults(struct lm3601x_led *led)
{
int flags_val;
int ret;
ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val);
if (ret < 0)
return -EIO;
led->last_flag = 0;
if (flags_val & LM36010_OVP_FAULT)
led->last_flag |= LED_FAULT_OVER_VOLTAGE;
if (flags_val & (LM3601X_THERM_SHUTDOWN | LM3601X_THERM_CURR))
led->last_flag |= LED_FAULT_OVER_TEMPERATURE;
if (flags_val & LM3601X_SHORT_FAULT)
led->last_flag |= LED_FAULT_SHORT_CIRCUIT;
if (flags_val & LM36010_CURR_LIMIT)
led->last_flag |= LED_FAULT_OVER_CURRENT;
if (flags_val & LM3601X_UVLO_FAULT)
led->last_flag |= LED_FAULT_UNDER_VOLTAGE;
if (flags_val & LM3601X_IVFM_TRIP)
led->last_flag |= LED_FAULT_INPUT_VOLTAGE;
if (flags_val & LM3601X_THERM_SHUTDOWN)
led->last_flag |= LED_FAULT_LED_OVER_TEMPERATURE;
return led->last_flag;
}
static int lm3601x_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
int ret, led_mode_val;
mutex_lock(&led->lock);
ret = lm3601x_read_faults(led);
if (ret < 0)
goto out;
if (led->led_mode == LM3601X_LED_TORCH)
led_mode_val = LM3601X_MODE_TORCH;
else
led_mode_val = LM3601X_MODE_IR_DRV;
if (brightness == LED_OFF) {
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
led_mode_val, LED_OFF);
goto out;
}
ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness);
if (ret < 0)
goto out;
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV,
led_mode_val);
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev,
bool state)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
int timeout_reg_val;
int current_timeout;
int ret;
mutex_lock(&led->lock);
ret = regmap_read(led->regmap, LM3601X_CFG_REG, &current_timeout);
if (ret < 0)
goto out;
if (led->flash_timeout >= LM3601X_TIMEOUT_XOVER_US)
timeout_reg_val = led->flash_timeout / LM3601X_UPPER_STEP_US + 0x07;
else
timeout_reg_val = led->flash_timeout / LM3601X_LOWER_STEP_US - 0x01;
if (led->flash_timeout != current_timeout)
ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG,
LM3601X_TIMEOUT_MASK, timeout_reg_val);
if (state)
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV,
LM3601X_MODE_STROBE);
else
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_STROBE, LED_OFF);
ret = lm3601x_read_faults(led);
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_flash_brightness_set(struct led_classdev_flash *fled_cdev,
u32 brightness)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
u8 brightness_val;
int ret;
mutex_lock(&led->lock);
ret = lm3601x_read_faults(led);
if (ret < 0)
goto out;
if (brightness == LED_OFF) {
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_STROBE, LED_OFF);
goto out;
}
brightness_val = brightness / LM3601X_STROBE_REG_DIV;
ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val);
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_flash_timeout_set(struct led_classdev_flash *fled_cdev,
u32 timeout)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
mutex_lock(&led->lock);
led->flash_timeout = timeout;
mutex_unlock(&led->lock);
return 0;
}
static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
int strobe_state;
int ret;
mutex_lock(&led->lock);
ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state);
if (ret < 0)
goto out;
*state = strobe_state & LM3601X_MODE_STROBE;
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_flash_fault_get(struct led_classdev_flash *fled_cdev,
u32 *fault)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
lm3601x_read_faults(led);
*fault = led->last_flag;
return 0;
}
static const struct led_flash_ops flash_ops = {
.flash_brightness_set = lm3601x_flash_brightness_set,
.strobe_set = lm3601x_strobe_set,
.strobe_get = lm3601x_strobe_get,
.timeout_set = lm3601x_flash_timeout_set,
.fault_get = lm3601x_flash_fault_get,
};
static int lm3601x_register_leds(struct lm3601x_led *led)
{
struct led_classdev *led_cdev;
struct led_flash_setting *setting;
led->fled_cdev.ops = &flash_ops;
setting = &led->fled_cdev.timeout;
setting->min = LM3601X_MIN_TIMEOUT_US;
setting->max = led->max_flash_timeout;
setting->step = LM3601X_LOWER_STEP_US;
setting->val = led->max_flash_timeout;
setting = &led->fled_cdev.brightness;
setting->min = LM3601X_MIN_STROBE_I_UA;
setting->max = led->flash_current_max;
setting->step = LM3601X_TORCH_REG_DIV;
setting->val = led->flash_current_max;
led_cdev = &led->fled_cdev.led_cdev;
led_cdev->name = led->led_name;
led_cdev->brightness_set_blocking = lm3601x_brightness_set;
led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max,
LM3601X_TORCH_REG_DIV);
led_cdev->flags |= LED_DEV_CAP_FLASH;
return led_classdev_flash_register(&led->client->dev, &led->fled_cdev);
}
static int lm3601x_parse_node(struct lm3601x_led *led)
{
struct fwnode_handle *child = NULL;
int ret = -ENODEV;
const char *name;
child = device_get_next_child_node(&led->client->dev, child);
if (!child) {
dev_err(&led->client->dev, "No LED Child node\n");
return ret;
}
ret = fwnode_property_read_u32(child, "reg", &led->led_mode);
if (ret) {
dev_err(&led->client->dev, "reg DT property missing\n");
goto out_err;
}
if (led->led_mode > LM3601X_LED_TORCH ||
led->led_mode < LM3601X_LED_IR) {
dev_warn(&led->client->dev, "Invalid led mode requested\n");
ret = -EINVAL;
goto out_err;
}
ret = fwnode_property_read_string(child, "label", &name);
if (ret) {
if (led->led_mode == LM3601X_LED_TORCH)
name = "torch";
else
name = "infrared";
}
snprintf(led->led_name, sizeof(led->led_name),
"%s:%s", led->client->name, name);
ret = fwnode_property_read_u32(child, "led-max-microamp",
&led->torch_current_max);
if (ret) {
dev_warn(&led->client->dev,
"led-max-microamp DT property missing\n");
goto out_err;
}
ret = fwnode_property_read_u32(child, "flash-max-microamp",
&led->flash_current_max);
if (ret) {
dev_warn(&led->client->dev,
"flash-max-microamp DT property missing\n");
goto out_err;
}
ret = fwnode_property_read_u32(child, "flash-max-timeout-us",
&led->max_flash_timeout);
if (ret) {
dev_warn(&led->client->dev,
"flash-max-timeout-us DT property missing\n");
goto out_err;
}
out_err:
fwnode_handle_put(child);
return ret;
}
static int lm3601x_probe(struct i2c_client *client)
{
struct lm3601x_led *led;
int ret;
led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->client = client;
i2c_set_clientdata(client, led);
ret = lm3601x_parse_node(led);
if (ret)
return -ENODEV;
led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap);
if (IS_ERR(led->regmap)) {
ret = PTR_ERR(led->regmap);
dev_err(&client->dev,
"Failed to allocate register map: %d\n", ret);
return ret;
}
mutex_init(&led->lock);
return lm3601x_register_leds(led);
}
static int lm3601x_remove(struct i2c_client *client)
{
struct lm3601x_led *led = i2c_get_clientdata(client);
led_classdev_flash_unregister(&led->fled_cdev);
mutex_destroy(&led->lock);
return regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_ENABLE_MASK,
LM3601X_MODE_STANDBY);
}
static const struct i2c_device_id lm3601x_id[] = {
{ "LM36010", CHIP_LM36010 },
{ "LM36011", CHIP_LM36011 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm3601x_id);
static const struct of_device_id of_lm3601x_leds_match[] = {
{ .compatible = "ti,lm36010", },
{ .compatible = "ti,lm36011", },
{ }
};
MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match);
static struct i2c_driver lm3601x_i2c_driver = {
.driver = {
.name = "lm3601x",
.of_match_table = of_lm3601x_leds_match,
},
.probe_new = lm3601x_probe,
.remove = lm3601x_remove,
.id_table = lm3601x_id,
};
module_i2c_driver(lm3601x_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");

244
drivers/leds/leds-sc27xx-bltc.c Normal file
View File

@ -0,0 +1,244 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Spreadtrum Communications Inc.
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <uapi/linux/uleds.h>
/* PMIC global control register definition */
#define SC27XX_MODULE_EN0 0xc08
#define SC27XX_CLK_EN0 0xc18
#define SC27XX_RGB_CTRL 0xebc
#define SC27XX_BLTC_EN BIT(9)
#define SC27XX_RTC_EN BIT(7)
#define SC27XX_RGB_PD BIT(0)
/* Breathing light controller register definition */
#define SC27XX_LEDS_CTRL 0x00
#define SC27XX_LEDS_PRESCALE 0x04
#define SC27XX_LEDS_DUTY 0x08
#define SC27XX_LEDS_CURVE0 0x0c
#define SC27XX_LEDS_CURVE1 0x10
#define SC27XX_CTRL_SHIFT 4
#define SC27XX_LED_RUN BIT(0)
#define SC27XX_LED_TYPE BIT(1)
#define SC27XX_DUTY_SHIFT 8
#define SC27XX_DUTY_MASK GENMASK(15, 0)
#define SC27XX_MOD_MASK GENMASK(7, 0)
#define SC27XX_LEDS_OFFSET 0x10
#define SC27XX_LEDS_MAX 3
struct sc27xx_led {
char name[LED_MAX_NAME_SIZE];
struct led_classdev ldev;
struct sc27xx_led_priv *priv;
u8 line;
bool active;
};
struct sc27xx_led_priv {
struct sc27xx_led leds[SC27XX_LEDS_MAX];
struct regmap *regmap;
struct mutex lock;
u32 base;
};
#define to_sc27xx_led(ldev) \
container_of(ldev, struct sc27xx_led, ldev)
static int sc27xx_led_init(struct regmap *regmap)
{
int err;
err = regmap_update_bits(regmap, SC27XX_MODULE_EN0, SC27XX_BLTC_EN,
SC27XX_BLTC_EN);
if (err)
return err;
err = regmap_update_bits(regmap, SC27XX_CLK_EN0, SC27XX_RTC_EN,
SC27XX_RTC_EN);
if (err)
return err;
return regmap_update_bits(regmap, SC27XX_RGB_CTRL, SC27XX_RGB_PD, 0);
}
static u32 sc27xx_led_get_offset(struct sc27xx_led *leds)
{
return leds->priv->base + SC27XX_LEDS_OFFSET * leds->line;
}
static int sc27xx_led_enable(struct sc27xx_led *leds, enum led_brightness value)
{
u32 base = sc27xx_led_get_offset(leds);
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
struct regmap *regmap = leds->priv->regmap;
int err;
err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
SC27XX_DUTY_MASK,
(value << SC27XX_DUTY_SHIFT) |
SC27XX_MOD_MASK);
if (err)
return err;
return regmap_update_bits(regmap, ctrl_base,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift);
}
static int sc27xx_led_disable(struct sc27xx_led *leds)
{
struct regmap *regmap = leds->priv->regmap;
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
return regmap_update_bits(regmap, ctrl_base,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
}
static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
{
struct sc27xx_led *leds = to_sc27xx_led(ldev);
int err;
mutex_lock(&leds->priv->lock);
if (value == LED_OFF)
err = sc27xx_led_disable(leds);
else
err = sc27xx_led_enable(leds, value);
mutex_unlock(&leds->priv->lock);
return err;
}
static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
{
int i, err;
err = sc27xx_led_init(priv->regmap);
if (err)
return err;
for (i = 0; i < SC27XX_LEDS_MAX; i++) {
struct sc27xx_led *led = &priv->leds[i];
if (!led->active)
continue;
led->line = i;
led->priv = priv;
led->ldev.name = led->name;
led->ldev.brightness_set_blocking = sc27xx_led_set;
err = devm_led_classdev_register(dev, &led->ldev);
if (err)
return err;
}
return 0;
}
static int sc27xx_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node, *child;
struct sc27xx_led_priv *priv;
const char *str;
u32 base, count, reg;
int err;
count = of_get_child_count(np);
if (!count || count > SC27XX_LEDS_MAX)
return -EINVAL;
err = of_property_read_u32(np, "reg", &base);
if (err) {
dev_err(dev, "fail to get reg of property\n");
return err;
}
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
mutex_init(&priv->lock);
priv->base = base;
priv->regmap = dev_get_regmap(dev->parent, NULL);
if (!priv->regmap) {
err = -ENODEV;
dev_err(dev, "failed to get regmap: %d\n", err);
return err;
}
for_each_child_of_node(np, child) {
err = of_property_read_u32(child, "reg", &reg);
if (err) {
of_node_put(child);
mutex_destroy(&priv->lock);
return err;
}
if (reg >= SC27XX_LEDS_MAX || priv->leds[reg].active) {
of_node_put(child);
mutex_destroy(&priv->lock);
return -EINVAL;
}
priv->leds[reg].active = true;
err = of_property_read_string(child, "label", &str);
if (err)
snprintf(priv->leds[reg].name, LED_MAX_NAME_SIZE,
"sc27xx::");
else
snprintf(priv->leds[reg].name, LED_MAX_NAME_SIZE,
"sc27xx:%s", str);
}
err = sc27xx_led_register(dev, priv);
if (err)
mutex_destroy(&priv->lock);
return err;
}
static int sc27xx_led_remove(struct platform_device *pdev)
{
struct sc27xx_led_priv *priv = platform_get_drvdata(pdev);
mutex_destroy(&priv->lock);
return 0;
}
static const struct of_device_id sc27xx_led_of_match[] = {
{ .compatible = "sprd,sc2731-bltc", },
{ }
};
MODULE_DEVICE_TABLE(of, sc27xx_led_of_match);
static struct platform_driver sc27xx_led_driver = {
.driver = {
.name = "sprd-bltc",
.of_match_table = sc27xx_led_of_match,
},
.probe = sc27xx_led_probe,
.remove = sc27xx_led_remove,
};
module_platform_driver(sc27xx_led_driver);
MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
MODULE_LICENSE("GPL v2");

22
drivers/leds/leds-wm831x-status.c
View File

@ -188,24 +188,14 @@ static ssize_t wm831x_status_src_store(struct device *dev,
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct wm831x_status *led = to_wm831x_status(led_cdev);
char name[20];
int i;
size_t len;
name[sizeof(name) - 1] = '\0';
strncpy(name, buf, sizeof(name) - 1);
len = strlen(name);
if (len && name[len - 1] == '\n')
name[len - 1] = '\0';
for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
if (!strcmp(name, led_src_texts[i])) {
mutex_lock(&led->mutex);
led->src = i;
mutex_unlock(&led->mutex);
wm831x_status_set(led);
}
i = sysfs_match_string(led_src_texts, buf);
if (i >= 0) {
mutex_lock(&led->mutex);
led->src = i;
mutex_unlock(&led->mutex);
wm831x_status_set(led);
}
return size;