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/*
* Copyright 2015-16 Golden Delicious Computers
*
* Author: Nikolaus Schaller <hns@goldelico.com>
*
* This file is subject to the terms and conditions of version 2 of
* the GNU General Public License. See the file COPYING in the main
* directory of this archive for more details.
*
* LED driver for the IS31FL319{0,1,3,6,9} to drive 1, 3, 6 or 9 light
* effect LEDs.
*
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
/* register numbers */
#define IS31FL319X_SHUTDOWN 0x00
#define IS31FL319X_CTRL1 0x01
#define IS31FL319X_CTRL2 0x02
#define IS31FL319X_CONFIG1 0x03
#define IS31FL319X_CONFIG2 0x04
#define IS31FL319X_RAMP_MODE 0x05
#define IS31FL319X_BREATH_MASK 0x06
#define IS31FL319X_PWM(channel) (0x07 + channel)
#define IS31FL319X_DATA_UPDATE 0x10
#define IS31FL319X_T0(channel) (0x11 + channel)
#define IS31FL319X_T123_1 0x1a
#define IS31FL319X_T123_2 0x1b
#define IS31FL319X_T123_3 0x1c
#define IS31FL319X_T4(channel) (0x1d + channel)
#define IS31FL319X_TIME_UPDATE 0x26
#define IS31FL319X_RESET 0xff
#define IS31FL319X_REG_CNT (IS31FL319X_RESET + 1)
#define IS31FL319X_MAX_LEDS 9
/* CS (Current Setting) in CONFIG2 register */
#define IS31FL319X_CONFIG2_CS_SHIFT 4
#define IS31FL319X_CONFIG2_CS_MASK 0x7
#define IS31FL319X_CONFIG2_CS_STEP_REF 12
#define IS31FL319X_CURRENT_MIN ((u32)5000)
#define IS31FL319X_CURRENT_MAX ((u32)40000)
#define IS31FL319X_CURRENT_STEP ((u32)5000)
#define IS31FL319X_CURRENT_DEFAULT ((u32)20000)
/* Audio gain in CONFIG2 register */
#define IS31FL319X_AUDIO_GAIN_DB_MAX ((u32)21)
#define IS31FL319X_AUDIO_GAIN_DB_STEP ((u32)3)
/*
* regmap is used as a cache of chip's register space,
* to avoid reading back brightness values from chip,
* which is known to hang.
*/
struct is31fl319x_chip {
const struct is31fl319x_chipdef *cdef;
struct i2c_client *client;
struct regmap *regmap;
struct mutex lock;
u32 audio_gain_db;
struct is31fl319x_led {
struct is31fl319x_chip *chip;
struct led_classdev cdev;
u32 max_microamp;
bool configured;
} leds[IS31FL319X_MAX_LEDS];
};
struct is31fl319x_chipdef {
int num_leds;
};
static const struct is31fl319x_chipdef is31fl3190_cdef = {
.num_leds = 1,
};
static const struct is31fl319x_chipdef is31fl3193_cdef = {
.num_leds = 3,
};
static const struct is31fl319x_chipdef is31fl3196_cdef = {
.num_leds = 6,
};
static const struct is31fl319x_chipdef is31fl3199_cdef = {
.num_leds = 9,
};
static const struct of_device_id of_is31fl319x_match[] = {
{ .compatible = "issi,is31fl3190", .data = &is31fl3190_cdef, },
{ .compatible = "issi,is31fl3191", .data = &is31fl3190_cdef, },
{ .compatible = "issi,is31fl3193", .data = &is31fl3193_cdef, },
{ .compatible = "issi,is31fl3196", .data = &is31fl3196_cdef, },
{ .compatible = "issi,is31fl3199", .data = &is31fl3199_cdef, },
{ .compatible = "si-en,sn3199", .data = &is31fl3199_cdef, },
{ }
};
MODULE_DEVICE_TABLE(of, of_is31fl319x_match);
static int is31fl319x_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led,
cdev);
struct is31fl319x_chip *is31 = led->chip;
int chan = led - is31->leds;
int ret;
int i;
u8 ctrl1 = 0, ctrl2 = 0;
dev_dbg(&is31->client->dev, "%s %d: %d\n", __func__, chan, brightness);
mutex_lock(&is31->lock);
/* update PWM register */
ret = regmap_write(is31->regmap, IS31FL319X_PWM(chan), brightness);
if (ret < 0)
goto out;
/* read current brightness of all PWM channels */
for (i = 0; i < is31->cdef->num_leds; i++) {
unsigned int pwm_value;
bool on;
/*
* since neither cdev nor the chip can provide
* the current setting, we read from the regmap cache
*/
ret = regmap_read(is31->regmap, IS31FL319X_PWM(i), &pwm_value);
dev_dbg(&is31->client->dev, "%s read %d: ret=%d: %d\n",
__func__, i, ret, pwm_value);
on = ret >= 0 && pwm_value > LED_OFF;
if (i < 3)
ctrl1 |= on << i; /* 0..2 => bit 0..2 */
else if (i < 6)
ctrl1 |= on << (i + 1); /* 3..5 => bit 4..6 */
else
ctrl2 |= on << (i - 6); /* 6..8 => bit 0..2 */
}
if (ctrl1 > 0 || ctrl2 > 0) {
dev_dbg(&is31->client->dev, "power up %02x %02x\n",
ctrl1, ctrl2);
regmap_write(is31->regmap, IS31FL319X_CTRL1, ctrl1);
regmap_write(is31->regmap, IS31FL319X_CTRL2, ctrl2);
/* update PWMs */
regmap_write(is31->regmap, IS31FL319X_DATA_UPDATE, 0x00);
/* enable chip from shut down */
ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01);
} else {
dev_dbg(&is31->client->dev, "power down\n");
/* shut down (no need to clear CTRL1/2) */
ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x00);
}
out:
mutex_unlock(&is31->lock);
return ret;
}
static int is31fl319x_parse_child_dt(const struct device *dev,
const struct device_node *child,
struct is31fl319x_led *led)
{
struct led_classdev *cdev = &led->cdev;
int ret;
if (of_property_read_string(child, "label", &cdev->name))
cdev->name = child->name;
ret = of_property_read_string(child, "linux,default-trigger",
&cdev->default_trigger);
if (ret < 0 && ret != -EINVAL) /* is optional */
return ret;
led->max_microamp = IS31FL319X_CURRENT_DEFAULT;
ret = of_property_read_u32(child, "led-max-microamp",
&led->max_microamp);
if (!ret) {
if (led->max_microamp < IS31FL319X_CURRENT_MIN)
return -EINVAL; /* not supported */
led->max_microamp = min(led->max_microamp,
IS31FL319X_CURRENT_MAX);
}
return 0;
}
static int is31fl319x_parse_dt(struct device *dev,
struct is31fl319x_chip *is31)
{
struct device_node *np = dev->of_node, *child;
const struct of_device_id *of_dev_id;
int count;
int ret;
if (!np)
return -ENODEV;
of_dev_id = of_match_device(of_is31fl319x_match, dev);
if (!of_dev_id) {
dev_err(dev, "Failed to match device with supported chips\n");
return -EINVAL;
}
is31->cdef = of_dev_id->data;
count = of_get_child_count(np);
dev_dbg(dev, "probe %s with %d leds defined in DT\n",
of_dev_id->compatible, count);
if (!count || count > is31->cdef->num_leds) {
dev_err(dev, "Number of leds defined must be between 1 and %u\n",
is31->cdef->num_leds);
return -ENODEV;
}
for_each_child_of_node(np, child) {
struct is31fl319x_led *led;
u32 reg;
ret = of_property_read_u32(child, "reg", ®);
if (ret) {
dev_err(dev, "Failed to read led 'reg' property\n");
goto put_child_node;
}
if (reg < 1 || reg > is31->cdef->num_leds) {
dev_err(dev, "invalid led reg %u\n", reg);
ret = -EINVAL;
goto put_child_node;
}
led = &is31->leds[reg - 1];
if (led->configured) {
dev_err(dev, <
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