Re: [PATCH v17 RESEND 1/3] leds: rgb: mt6370: Add MediaTek MT6370 current sink type LED Indicator support

From: Lee Jones
Date: Sun Mar 05 2023 - 03:56:04 EST

On Thu, 23 Feb 2023, ChiaEn Wu wrote:

> From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
>
> The MediaTek MT6370 is a highly-integrated smart power management IC,
> which includes a single cell Li-Ion/Li-Polymer switching battery
> charger, a USB Type-C & Power Delivery (PD) controller, dual
> Flash LED current sources, a RGB LED driver, a backlight WLED driver,
> a display bias driver and a general LDO for portable devices.
>
> Add support for the MediaTek MT6370 Current Sink Type LED Indicator
> driver. It can control four channels current-sink RGB LEDs with 3 modes:
> constant current, PWM, and breath mode.
>
> Acked-by: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>
> Co-developed-by: Alice Chen <alice_chen@xxxxxxxxxxx>
> Signed-off-by: Alice Chen <alice_chen@xxxxxxxxxxx>
> Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> Signed-off-by: ChiaEn Wu <chiaen_wu@xxxxxxxxxxx>
> ---
> v17
> - Update the year of Copyright from 2022 to 2023
>
> ---
> drivers/leds/rgb/Kconfig | 13 +
> drivers/leds/rgb/Makefile | 1 +
> drivers/leds/rgb/leds-mt6370-rgb.c | 1009 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 1023 insertions(+)
> create mode 100644 drivers/leds/rgb/leds-mt6370-rgb.c

In generally, this is really nicely done. Great job.

Just a few niggles, then you'll be good to go.

> diff --git a/drivers/leds/rgb/Kconfig b/drivers/leds/rgb/Kconfig
> index 204cf47..7d86bb2 100644
> --- a/drivers/leds/rgb/Kconfig
> +++ b/drivers/leds/rgb/Kconfig
> @@ -26,4 +26,17 @@ config LEDS_QCOM_LPG
>
> If compiled as a module, the module will be named leds-qcom-lpg.
>
> +config LEDS_MT6370_RGB
> + tristate "LED Support for MediaTek MT6370 PMIC"
> + depends on MFD_MT6370
> + select LINEAR_RANGE
> + help
> + Say Y here to enable support for MT6370_RGB LED device.
> + In MT6370, there are four channel current-sink LED drivers that
> + support hardware pattern for constant current, PWM, and breath mode.
> + Isink4 channel can also be used as a CHG_VIN power good indicator.
> +
> + This driver can also be built as a module. If so, the module
> + will be called "leds-mt6370-rgb".
> +
> endif # LEDS_CLASS_MULTICOLOR
> diff --git a/drivers/leds/rgb/Makefile b/drivers/leds/rgb/Makefile
> index 0675bc0..8c01daf 100644
> --- a/drivers/leds/rgb/Makefile
> +++ b/drivers/leds/rgb/Makefile
> @@ -2,3 +2,4 @@
>
> obj-$(CONFIG_LEDS_PWM_MULTICOLOR) += leds-pwm-multicolor.o
> obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg.o
> +obj-$(CONFIG_LEDS_MT6370_RGB) += leds-mt6370-rgb.o
> diff --git a/drivers/leds/rgb/leds-mt6370-rgb.c b/drivers/leds/rgb/leds-mt6370-rgb.c
> new file mode 100644
> index 00000000..185d5d7
> --- /dev/null
> +++ b/drivers/leds/rgb/leds-mt6370-rgb.c
> @@ -0,0 +1,1009 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2023 Richtek Technology Corp.
> + *
> + * Authors:
> + * ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> + * Alice Chen <alice_chen@xxxxxxxxxxx>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/kernel.h>
> +#include <linux/leds.h>
> +#include <linux/led-class-multicolor.h>
> +#include <linux/linear_range.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +#include <linux/regmap.h>
> +#include <linux/util_macros.h>
> +
> +#include <asm/unaligned.h>
> +
> +enum {
> + MT6370_LED_ISNK1 = 0,
> + MT6370_LED_ISNK2,
> + MT6370_LED_ISNK3,
> + MT6370_LED_ISNK4,
> + MT6370_MAX_LEDS
> +};
> +
> +enum mt6370_led_mode {
> + MT6370_LED_PWM_MODE = 0,
> + MT6370_LED_BREATH_MODE,
> + MT6370_LED_REG_MODE,
> + MT6370_LED_MAX_MODE
> +};
> +
> +enum mt6370_led_field {
> + F_RGB_EN = 0,
> + F_CHGIND_EN,
> + F_LED1_CURR,
> + F_LED2_CURR,
> + F_LED3_CURR,
> + F_LED4_CURR,
> + F_LED1_MODE,
> + F_LED2_MODE,
> + F_LED3_MODE,
> + F_LED4_MODE,
> + F_LED1_DUTY,
> + F_LED2_DUTY,
> + F_LED3_DUTY,
> + F_LED4_DUTY,
> + F_LED1_FREQ,
> + F_LED2_FREQ,
> + F_LED3_FREQ,
> + F_LED4_FREQ,
> + F_MAX_FIELDS
> +};
> +
> +enum mt6370_led_ranges {
> + R_LED123_CURR = 0,
> + R_LED4_CURR,
> + R_LED_TRFON,
> + R_LED_TOFF,
> + R_MAX_RANGES
> +};
> +
> +enum mt6370_pattern {
> + P_LED_TR1 = 0,
> + P_LED_TR2,
> + P_LED_TF1,
> + P_LED_TF2,
> + P_LED_TON,
> + P_LED_TOFF,
> + P_MAX_PATTERNS
> +};
> +
> +#define MT6370_REG_DEV_INFO 0x100
> +#define MT6370_REG_RGB1_DIM 0x182
> +#define MT6370_REG_RGB2_DIM 0x183
> +#define MT6370_REG_RGB3_DIM 0x184
> +#define MT6370_REG_RGB_EN 0x185
> +#define MT6370_REG_RGB1_ISNK 0x186
> +#define MT6370_REG_RGB2_ISNK 0x187
> +#define MT6370_REG_RGB3_ISNK 0x188
> +#define MT6370_REG_RGB1_TR 0x189
> +#define MT6370_REG_RGB_CHRIND_DIM 0x192
> +#define MT6370_REG_RGB_CHRIND_CTRL 0x193
> +#define MT6370_REG_RGB_CHRIND_TR 0x194
> +
> +#define MT6372_REG_RGB_EN 0x182
> +#define MT6372_REG_RGB1_ISNK 0x183
> +#define MT6372_REG_RGB2_ISNK 0x184
> +#define MT6372_REG_RGB3_ISNK 0x185
> +#define MT6372_REG_RGB4_ISNK 0x186
> +#define MT6372_REG_RGB1_DIM 0x187
> +#define MT6372_REG_RGB2_DIM 0x188
> +#define MT6372_REG_RGB3_DIM 0x189
> +#define MT6372_REG_RGB4_DIM 0x18A
> +#define MT6372_REG_RGB12_FREQ 0x18B
> +#define MT6372_REG_RGB34_FREQ 0x18C
> +#define MT6372_REG_RGB1_TR 0x18D
> +
> +#define MT6370_VENID_MASK GENMASK(7, 4)

Vendor? Defines should be self documenting.

What does this save over "VENDOR_ID"?

> +#define MT6370_CHEN_BIT(id) BIT(MT6370_LED_ISNK4 - id)
> +#define MT6370_VIRTUAL_MULTICOLOR 5
> +#define MC_CHANNEL_NUM 3
> +#define MT6370_PWM_DUTY (BIT(5) - 1)
> +#define MT6372_PWM_DUTY (BIT(8) - 1)
> +
> +struct mt6370_led {
> + /*
> + * If the color of the LED in DT is set to
> + * - 'LED_COLOR_ID_RGB'
> + * - 'LED_COLOR_ID_MULTI'
> + * The member 'index' of this struct will be set to
> + * 'MT6370_VIRTUAL_MULTICOLOR'.
> + * If so, this LED will choose 'struct led_classdev_mc mc' to use.
> + * Instead, if the member 'index' of this struct is set to
> + * 'MT6370_LED_ISNK1' ~ 'MT6370_LED_ISNK4', then this LED will choose
> + * 'struct led_classdev isink' to use.
> + */
> + union {
> + struct led_classdev isink;
> + struct led_classdev_mc mc;
> + };
> + struct mt6370_priv *priv;
> + enum led_default_state default_state;
> + u32 index;
> +};
> +
> +struct mt6370_pdata {
> + const unsigned int *tfreq;
> + unsigned int tfreq_len;
> + u16 reg_rgb1_tr;
> + s16 reg_rgb_chrind_tr;
> + u8 pwm_duty;
> +};
> +
> +struct mt6370_priv {
> + /* Per LED access lock */
> + struct mutex lock;
> + struct regmap *regmap;
> + struct regmap_field *fields[F_MAX_FIELDS];
> + const struct reg_field *reg_fields;
> + const struct linear_range *ranges;
> + struct reg_cfg *reg_cfgs;
> + const struct mt6370_pdata *pdata;
> + unsigned int leds_count;
> + unsigned int leds_active;
> + struct mt6370_led leds[];
> +};
> +
> +static const struct reg_field common_reg_fields[F_MAX_FIELDS] = {
> + [F_RGB_EN] = REG_FIELD(MT6370_REG_RGB_EN, 4, 7),
> + [F_CHGIND_EN] = REG_FIELD(MT6370_REG_RGB_CHRIND_DIM, 7, 7),
> + [F_LED1_CURR] = REG_FIELD(MT6370_REG_RGB1_ISNK, 0, 2),
> + [F_LED2_CURR] = REG_FIELD(MT6370_REG_RGB2_ISNK, 0, 2),
> + [F_LED3_CURR] = REG_FIELD(MT6370_REG_RGB3_ISNK, 0, 2),
> + [F_LED4_CURR] = REG_FIELD(MT6370_REG_RGB_CHRIND_CTRL, 0, 1),
> + [F_LED1_MODE] = REG_FIELD(MT6370_REG_RGB1_DIM, 5, 6),
> + [F_LED2_MODE] = REG_FIELD(MT6370_REG_RGB2_DIM, 5, 6),
> + [F_LED3_MODE] = REG_FIELD(MT6370_REG_RGB3_DIM, 5, 6),
> + [F_LED4_MODE] = REG_FIELD(MT6370_REG_RGB_CHRIND_DIM, 5, 6),
> + [F_LED1_DUTY] = REG_FIELD(MT6370_REG_RGB1_DIM, 0, 4),
> + [F_LED2_DUTY] = REG_FIELD(MT6370_REG_RGB2_DIM, 0, 4),
> + [F_LED3_DUTY] = REG_FIELD(MT6370_REG_RGB3_DIM, 0, 4),
> + [F_LED4_DUTY] = REG_FIELD(MT6370_REG_RGB_CHRIND_DIM, 0, 4),
> + [F_LED1_FREQ] = REG_FIELD(MT6370_REG_RGB1_ISNK, 3, 5),
> + [F_LED2_FREQ] = REG_FIELD(MT6370_REG_RGB2_ISNK, 3, 5),
> + [F_LED3_FREQ] = REG_FIELD(MT6370_REG_RGB3_ISNK, 3, 5),
> + [F_LED4_FREQ] = REG_FIELD(MT6370_REG_RGB_CHRIND_CTRL, 2, 4),
> +};
> +
> +static const struct reg_field mt6372_reg_fields[F_MAX_FIELDS] = {
> + [F_RGB_EN] = REG_FIELD(MT6372_REG_RGB_EN, 4, 7),
> + [F_CHGIND_EN] = REG_FIELD(MT6372_REG_RGB_EN, 3, 3),
> + [F_LED1_CURR] = REG_FIELD(MT6372_REG_RGB1_ISNK, 0, 3),
> + [F_LED2_CURR] = REG_FIELD(MT6372_REG_RGB2_ISNK, 0, 3),
> + [F_LED3_CURR] = REG_FIELD(MT6372_REG_RGB3_ISNK, 0, 3),
> + [F_LED4_CURR] = REG_FIELD(MT6372_REG_RGB4_ISNK, 0, 3),
> + [F_LED1_MODE] = REG_FIELD(MT6372_REG_RGB1_ISNK, 6, 7),
> + [F_LED2_MODE] = REG_FIELD(MT6372_REG_RGB2_ISNK, 6, 7),
> + [F_LED3_MODE] = REG_FIELD(MT6372_REG_RGB3_ISNK, 6, 7),
> + [F_LED4_MODE] = REG_FIELD(MT6372_REG_RGB4_ISNK, 6, 7),
> + [F_LED1_DUTY] = REG_FIELD(MT6372_REG_RGB1_DIM, 0, 7),
> + [F_LED2_DUTY] = REG_FIELD(MT6372_REG_RGB2_DIM, 0, 7),
> + [F_LED3_DUTY] = REG_FIELD(MT6372_REG_RGB3_DIM, 0, 7),
> + [F_LED4_DUTY] = REG_FIELD(MT6372_REG_RGB4_DIM, 0, 7),
> + [F_LED1_FREQ] = REG_FIELD(MT6372_REG_RGB12_FREQ, 5, 7),
> + [F_LED2_FREQ] = REG_FIELD(MT6372_REG_RGB12_FREQ, 2, 4),
> + [F_LED3_FREQ] = REG_FIELD(MT6372_REG_RGB34_FREQ, 5, 7),
> + [F_LED4_FREQ] = REG_FIELD(MT6372_REG_RGB34_FREQ, 2, 4),
> +};
> +
> +/* Current unit: microamp, time unit: millisecond */
> +static const struct linear_range common_led_ranges[R_MAX_RANGES] = {
> + [R_LED123_CURR] = { 4000, 1, 6, 4000 },
> + [R_LED4_CURR] = { 2000, 1, 3, 2000 },
> + [R_LED_TRFON] = { 125, 0, 15, 200 },
> + [R_LED_TOFF] = { 250, 0, 15, 400 },
> +};
> +
> +static const struct linear_range mt6372_led_ranges[R_MAX_RANGES] = {
> + [R_LED123_CURR] = { 2000, 1, 14, 2000 },
> + [R_LED4_CURR] = { 2000, 1, 14, 2000 },
> + [R_LED_TRFON] = { 125, 0, 15, 250 },
> + [R_LED_TOFF] = { 250, 0, 15, 500 },
> +};
> +
> +static const unsigned int common_tfreqs[] = {
> + 10000, 5000, 2000, 1000, 500, 200, 5, 1,
> +};
> +
> +static const unsigned int mt6372_tfreqs[] = {
> + 8000, 4000, 2000, 1000, 500, 250, 8, 4,
> +};
> +
> +static const struct mt6370_pdata common_pdata = {
> + .tfreq = common_tfreqs,
> + .tfreq_len = ARRAY_SIZE(common_tfreqs),
> + .pwm_duty = MT6370_PWM_DUTY,
> + .reg_rgb1_tr = MT6370_REG_RGB1_TR,
> + .reg_rgb_chrind_tr = MT6370_REG_RGB_CHRIND_TR,
> +};
> +
> +static const struct mt6370_pdata mt6372_pdata = {
> + .tfreq = mt6372_tfreqs,
> + .tfreq_len = ARRAY_SIZE(mt6372_tfreqs),
> + .pwm_duty = MT6372_PWM_DUTY,
> + .reg_rgb1_tr = MT6372_REG_RGB1_TR,
> + .reg_rgb_chrind_tr = -1,
> +};
> +
> +static enum mt6370_led_field mt6370_get_led_current_field(unsigned int led_no)
> +{
> + switch (led_no) {
> + case MT6370_LED_ISNK1:
> + return F_LED1_CURR;
> + case MT6370_LED_ISNK2:
> + return F_LED2_CURR;
> + case MT6370_LED_ISNK3:
> + return F_LED3_CURR;
> + default:
> + return F_LED4_CURR;
> + }
> +}
> +
> +static int mt6370_set_led_brightness(struct mt6370_priv *priv,
> + unsigned int led_no, unsigned int level)
> +{
> + enum mt6370_led_field sel_field;
> +
> + sel_field = mt6370_get_led_current_field(led_no);
> +
> + return regmap_field_write(priv->fields[sel_field], level);
> +}
> +
> +static int mt6370_get_led_brightness(struct mt6370_priv *priv,
> + unsigned int led_no, unsigned int *level)
> +{
> + enum mt6370_led_field sel_field;
> +
> + sel_field = mt6370_get_led_current_field(led_no);
> +
> + return regmap_field_read(priv->fields[sel_field], level);
> +}
> +
> +static int mt6370_set_led_duty(struct mt6370_priv *priv, unsigned int led_no,
> + unsigned int ton, unsigned int toff)
> +{
> + const struct mt6370_pdata *pdata = priv->pdata;
> + enum mt6370_led_field sel_field;
> + unsigned int divisor, ratio;
> +
> + divisor = pdata->pwm_duty;
> + ratio = ton * divisor / (ton + toff);
> +
> + switch (led_no) {
> + case MT6370_LED_ISNK1:
> + sel_field = F_LED1_DUTY;
> + break;
> + case MT6370_LED_ISNK2:
> + sel_field = F_LED2_DUTY;
> + break;
> + case MT6370_LED_ISNK3:
> + sel_field = F_LED3_DUTY;
> + break;
> + default:
> + sel_field = F_LED4_DUTY;
> + break;
> + }
> +
> + return regmap_field_write(priv->fields[sel_field], ratio);
> +}
> +
> +static int mt6370_set_led_freq(struct mt6370_priv *priv, unsigned int led_no,
> + unsigned int ton, unsigned int toff)
> +{
> + const struct mt6370_pdata *pdata = priv->pdata;
> + enum mt6370_led_field sel_field;
> + unsigned int tfreq_len = pdata->tfreq_len;
> + unsigned int tsum, sel;
> +
> + tsum = ton + toff;
> +
> + if (tsum > pdata->tfreq[0] || tsum < pdata->tfreq[tfreq_len - 1])
> + return -EOPNOTSUPP;
> +
> + sel = find_closest_descending(tsum, pdata->tfreq, tfreq_len);
> +
> + switch (led_no) {
> + case MT6370_LED_ISNK1:
> + sel_field = F_LED1_FREQ;
> + break;
> + case MT6370_LED_ISNK2:
> + sel_field = F_LED2_FREQ;
> + break;
> + case MT6370_LED_ISNK3:
> + sel_field = F_LED3_FREQ;
> + break;
> + default:
> + sel_field = F_LED4_FREQ;
> + break;
> + }
> +
> + return regmap_field_write(priv->fields[sel_field], sel);
> +}
> +
> +static void mt6370_get_breath_reg_base(struct mt6370_priv *priv,
> + unsigned int led_no, unsigned int *base)
> +{
> + const struct mt6370_pdata *pdata = priv->pdata;
> +
> + if (pdata->reg_rgb_chrind_tr < 0) {
> + *base = pdata->reg_rgb1_tr + led_no * 3;
> + return;
> + }
> +
> + switch (led_no) {
> + case MT6370_LED_ISNK1:
> + case MT6370_LED_ISNK2:
> + case MT6370_LED_ISNK3:
> + *base = pdata->reg_rgb1_tr + led_no * 3;
> + break;
> + default:
> + *base = pdata->reg_rgb_chrind_tr;
> + break;
> + }
> +}
> +
> +static int mt6370_gen_breath_pattern(struct mt6370_priv *priv,
> + struct led_pattern *pattern, u32 len,
> + u8 *pattern_val, u32 val_len)
> +{
> + enum mt6370_led_ranges sel_range;
> + struct led_pattern *curr;
> + unsigned int sel;
> + u32 val = 0;
> + int i;
> +
> + if (len < P_MAX_PATTERNS && val_len < P_MAX_PATTERNS / 2)
> + return -EINVAL;
> +
> + /*
> + * Pattern list
> + * tr1: byte 0, b'[7: 4]

Perhaps this is standard formatting and I'm just not aware of it, but
the space is throwing me and making me think twice. Does this mean bits
7 through 4, so b'11110000?

> + * tr2: byte 0, b'[3: 0]
> + * tf1: byte 1, b'[7: 4]
> + * tf2: byte 1, b'[3: 0]
> + * ton: byte 2, b'[7: 4]
> + * toff: byte 2, b'[3: 0]
> + */
> + for (i = 0; i < P_MAX_PATTERNS; i++) {
> + curr = pattern + i;
> +
> + sel_range = i == P_LED_TOFF ? R_LED_TOFF : R_LED_TRFON;
> +
> + linear_range_get_selector_within(priv->ranges + sel_range,
> + curr->delta_t, &sel);
> +
> + if (i % 2) {
> + val |= sel;
> + } else {
> + val <<= 8;
> + val |= sel << 4;
> + }
> + }
> +
> + put_unaligned_be24(val, pattern_val);
> +
> + return 0;
> +}
> +
> +static int mt6370_set_led_mode(struct mt6370_priv *priv, unsigned int led_no,
> + enum mt6370_led_mode mode)
> +{
> + enum mt6370_led_field sel_field;
> +
> + switch (led_no) {
> + case MT6370_LED_ISNK1:
> + sel_field = F_LED1_MODE;
> + break;
> + case MT6370_LED_ISNK2:
> + sel_field = F_LED2_MODE;
> + break;
> + case MT6370_LED_ISNK3:
> + sel_field = F_LED3_MODE;
> + break;
> + default:
> + sel_field = F_LED4_MODE;
> + break;
> + }
> +
> + return regmap_field_write(priv->fields[sel_field], mode);
> +}
> +
> +static int mt6370_mc_brightness_set(struct led_classdev *lcdev,
> + enum led_brightness level)
> +{
> + struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
> + struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
> + struct mt6370_priv *priv = led->priv;
> + struct mc_subled *subled;
> + unsigned int enable, disable;
> + int i, ret;
> +
> + mutex_lock(&priv->lock);
> +
> + led_mc_calc_color_components(mccdev, level);
> +
> + ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
> + if (ret)
> + goto out_unlock;
> +
> + disable = enable;
> +
> + for (i = 0; i < mccdev->num_colors; i++) {
> + u32 brightness;
> +
> + subled = mccdev->subled_info + i;
> + brightness = min(subled->brightness, lcdev->max_brightness);
> + disable &= ~MT6370_CHEN_BIT(subled->channel);
> +
> + if (level == 0) {
> + enable &= ~MT6370_CHEN_BIT(subled->channel);
> +
> + ret = mt6370_set_led_mode(priv, subled->channel,
> + MT6370_LED_REG_MODE);

Please unify your line-wrap strategy. In some places you are using the
full 100-chars allowable and in many others, you line-wrap early. Please
go through the entire file and unwrap to 100-chars where appropriate.

You'll see what I mean as you re-read the file with this in mind.

> + if (ret)
> + goto out_unlock;
> +
> + continue;
> + }
> +
> + if (brightness == 0) {
> + enable &= ~MT6370_CHEN_BIT(subled->channel);
> + continue;
> + }
> +
> + enable |= MT6370_CHEN_BIT(subled->channel);
> +
> + ret = mt6370_set_led_brightness(priv, subled->channel,
> + brightness);
> + if (ret)
> + goto out_unlock;
> + }
> +
> + ret = regmap_field_write(priv->fields[F_RGB_EN], disable);
> + if (ret)
> + goto out_unlock;
> +
> + ret = regmap_field_write(priv->fields[F_RGB_EN], enable);
> +
> +out_unlock:
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +static int mt6370_mc_blink_set(struct led_classdev *lcdev,
> + unsigned long *delay_on,
> + unsigned long *delay_off)
> +{
> + struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
> + struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
> + struct mt6370_priv *priv = led->priv;
> + struct mc_subled *subled;
> + unsigned int enable, disable;
> + int i, ret;
> +
> + mutex_lock(&priv->lock);
> +
> + if (!*delay_on && !*delay_off)
> + *delay_on = *delay_off = 500;
> +
> + ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
> + if (ret)
> + goto out_unlock;
> +
> + disable = enable;
> +
> + for (i = 0; i < mccdev->num_colors; i++) {
> + subled = mccdev->subled_info + i;
> +
> + disable &= ~MT6370_CHEN_BIT(subled->channel);
> +
> + ret = mt6370_set_led_duty(priv, subled->channel, *delay_on,
> + *delay_off);
> + if (ret)
> + goto out_unlock;
> +
> + ret = mt6370_set_led_freq(priv, subled->channel, *delay_on,
> + *delay_off);
> + if (ret)
> + goto out_unlock;
> +
> + ret = mt6370_set_led_mode(priv, subled->channel,
> + MT6370_LED_PWM_MODE);
> + if (ret)
> + goto out_unlock;
> + }
> +
> + /* Toggle to make pattern timing the same */
> + ret = regmap_field_write(priv->fields[F_RGB_EN], disable);
> + if (ret)
> + goto out_unlock;
> +
> + ret = regmap_field_write(priv->fields[F_RGB_EN], enable);
> +
> +out_unlock:
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +static int mt6370_mc_pattern_set(struct led_classdev *lcdev,
> + struct led_pattern *pattern, u32 len, int repeat)
> +{
> + struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
> + struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
> + struct mt6370_priv *priv = led->priv;
> + struct mc_subled *subled;
> + unsigned int reg_base, enable, disable;
> + u8 params[P_MAX_PATTERNS / 2];
> + int i, ret;
> +
> + mutex_lock(&priv->lock);
> +
> + ret = mt6370_gen_breath_pattern(priv, pattern, len, params,
> + sizeof(params));
> + if (ret)
> + goto out_unlock;
> +
> + ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
> + if (ret)
> + goto out_unlock;
> +
> + disable = enable;
> +
> + for (i = 0; i < mccdev->num_colors; i++) {
> + subled = mccdev->subled_info + i;
> +
> + mt6370_get_breath_reg_base(priv, subled->channel, &reg_base);
> + disable &= ~MT6370_CHEN_BIT(subled->channel);
> +
> + ret = regmap_raw_write(priv->regmap, reg_base, params,
> + sizeof(params));
> + if (ret)
> + goto out_unlock;
> +
> + ret = mt6370_set_led_mode(priv, subled->channel,
> + MT6370_LED_BREATH_MODE);
> + if (ret)
> + goto out_unlock;
> + }
> +
> + /* Toggle to make pattern timing be the same */
> + ret = regmap_field_write(priv->fields[F_RGB_EN], disable);
> + if (ret)
> + goto out_unlock;
> +
> + ret = regmap_field_write(priv->fields[F_RGB_EN], enable);
> +
> +out_unlock:
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +static inline int mt6370_mc_pattern_clear(struct led_classdev *lcdev)
> +{
> + struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
> + struct mt6370_led *led = container_of(mccdev, struct mt6370_led, mc);
> + struct mt6370_priv *priv = led->priv;
> + struct mc_subled *subled;
> + int i, ret;
> +
> + mutex_lock(&led->priv->lock);
> +
> + for (i = 0; i < mccdev->num_colors; i++) {
> + subled = mccdev->subled_info + i;
> +
> + ret = mt6370_set_led_mode(priv, subled->channel,
> + MT6370_LED_REG_MODE);
> + if (ret)
> + break;
> + }
> +
> + mutex_unlock(&led->priv->lock);
> +
> + return ret;
> +}
> +
> +static int mt6370_isnk_brightness_set(struct led_classdev *lcdev,
> + enum led_brightness level)
> +{
> + struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
> + struct mt6370_priv *priv = led->priv;
> + unsigned int enable;
> + int ret;
> +
> + mutex_lock(&priv->lock);
> +
> + ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
> + if (ret)
> + goto out_unlock;
> +
> + if (level == 0) {
> + enable &= ~MT6370_CHEN_BIT(led->index);
> +
> + ret = mt6370_set_led_mode(priv, led->index,
> + MT6370_LED_REG_MODE);
> + if (ret)
> + goto out_unlock;
> + } else {
> + enable |= MT6370_CHEN_BIT(led->index);
> +
> + ret = mt6370_set_led_brightness(priv, led->index, level);
> + if (ret)
> + goto out_unlock;
> + }
> +
> + ret = regmap_field_write(priv->fields[F_RGB_EN], enable);
> +
> +out_unlock:
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +static int mt6370_isnk_blink_set(struct led_classdev *lcdev,
> + unsigned long *delay_on,
> + unsigned long *delay_off)
> +{
> + struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
> + struct mt6370_priv *priv = led->priv;
> + int ret;
> +
> + mutex_lock(&priv->lock);
> +
> + if (!*delay_on && !*delay_off)
> + *delay_on = *delay_off = 500;
> +
> + ret = mt6370_set_led_duty(priv, led->index, *delay_on, *delay_off);
> + if (ret)
> + goto out_unlock;
> +
> + ret = mt6370_set_led_freq(priv, led->index, *delay_on, *delay_off);
> + if (ret)
> + goto out_unlock;
> +
> + ret = mt6370_set_led_mode(priv, led->index, MT6370_LED_PWM_MODE);
> +
> +out_unlock:
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +static int mt6370_isnk_pattern_set(struct led_classdev *lcdev,
> + struct led_pattern *pattern, u32 len,
> + int repeat)
> +{
> + struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
> + struct mt6370_priv *priv = led->priv;
> + unsigned int reg_base;
> + u8 params[P_MAX_PATTERNS / 2];
> + int ret;
> +
> + mutex_lock(&priv->lock);
> +
> + ret = mt6370_gen_breath_pattern(priv, pattern, len, params,
> + sizeof(params));
> + if (ret)
> + goto out_unlock;
> +
> + mt6370_get_breath_reg_base(priv, led->index, &reg_base);
> +
> + ret = regmap_raw_write(priv->regmap, reg_base, params, sizeof(params));
> + if (ret)
> + goto out_unlock;
> +
> + ret = mt6370_set_led_mode(priv, led->index, MT6370_LED_BREATH_MODE);
> +
> +out_unlock:
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +static inline int mt6370_isnk_pattern_clear(struct led_classdev *lcdev)
> +{
> + struct mt6370_led *led = container_of(lcdev, struct mt6370_led, isink);
> + struct mt6370_priv *priv = led->priv;
> + int ret;
> +
> + mutex_lock(&led->priv->lock);
> + ret = mt6370_set_led_mode(priv, led->index, MT6370_LED_REG_MODE);
> + mutex_unlock(&led->priv->lock);
> +
> + return ret;
> +}
> +
> +static int mt6370_init_led_properties(struct device *dev,
> + struct mt6370_led *led,
> + struct led_init_data *init_data)
> +{
> + struct mt6370_priv *priv = led->priv;
> + struct led_classdev *lcdev;
> + struct fwnode_handle *child;
> + enum mt6370_led_ranges sel_range;
> + u32 max_uA, max_level;
> + int ret;
> +
> + if (led->index == MT6370_VIRTUAL_MULTICOLOR) {

Rather than having these huge if-else statements, please consider using
a sub-function.

> + struct mc_subled *sub_led;
> + u32 num_color = 0;
> +
> + sub_led = devm_kcalloc(dev, MC_CHANNEL_NUM, sizeof(*sub_led),
> + GFP_KERNEL);
> + if (!sub_led)
> + return -ENOMEM;
> +
> + fwnode_for_each_child_node(init_data->fwnode, child) {
> + u32 reg, color;
> +
> + ret = fwnode_property_read_u32(child, "reg", &reg);
> + if (ret || reg > MT6370_LED_ISNK3 ||
> + priv->leds_active & BIT(reg)) {
> + fwnode_handle_put(child);
> + return -EINVAL;
> + }
> +
> + ret = fwnode_property_read_u32(child, "color", &color);
> + if (ret) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, ret, "LED %d, no color specified\n",
> + led->index);
> + }
> +
> + priv->leds_active |= BIT(reg);
> + sub_led[num_color].color_index = color;
> + sub_led[num_color].channel = reg;
> + sub_led[num_color].intensity = 0;
> + num_color++;
> + }
> +
> + if (num_color < 2)
> + return dev_err_probe(dev, -EINVAL,
> + "Multicolor must include 2 or more LED channels\n");
> +
> + led->mc.num_colors = num_color;
> + led->mc.subled_info = sub_led;
> +
> + lcdev = &led->mc.led_cdev;
> + lcdev->brightness_set_blocking = mt6370_mc_brightness_set;
> + lcdev->blink_set = mt6370_mc_blink_set;
> + lcdev->pattern_set = mt6370_mc_pattern_set;
> + lcdev->pattern_clear = mt6370_mc_pattern_clear;
> + } else {
> + lcdev = &led->isink;
> + lcdev->brightness_set_blocking = mt6370_isnk_brightness_set;
> + lcdev->blink_set = mt6370_isnk_blink_set;
> + lcdev->pattern_set = mt6370_isnk_pattern_set;
> + lcdev->pattern_clear = mt6370_isnk_pattern_clear;
> + }
> +
> + ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp",
> + &max_uA);
> + if (ret) {
> + dev_warn(dev, "Not specified led-max-microamp, config to the minimum\n");
> + max_uA = 0;
> + }
> +
> + if (led->index == MT6370_LED_ISNK4)
> + sel_range = R_LED4_CURR;
> + else
> + sel_range = R_LED123_CURR;
> +
> + linear_range_get_selector_within(priv->ranges + sel_range, max_uA,
> + &max_level);
> +
> + lcdev->max_brightness = max_level;
> +
> + led->default_state = led_init_default_state_get(init_data->fwnode);
> +
> + return 0;
> +}
> +
> +static int mt6370_isnk_init_default_state(struct mt6370_led *led)
> +{
> + struct mt6370_priv *priv = led->priv;
> + unsigned int enable, level;
> + int ret;
> +
> + ret = mt6370_get_led_brightness(priv, led->index, &level);
> + if (ret)
> + return ret;
> +
> + ret = regmap_field_read(priv->fields[F_RGB_EN], &enable);
> + if (ret)
> + return ret;
> +
> + if (!(enable & MT6370_CHEN_BIT(led->index)))
> + level = 0;
> +
> + switch (led->default_state) {
> + case LEDS_DEFSTATE_ON:
> + led->isink.brightness = led->isink.max_brightness;
> + break;
> + case LEDS_DEFSTATE_KEEP:
> + led->isink.brightness = min(level, led->isink.max_brightness);
> + break;
> + default:
> + led->isink.brightness = 0;
> + break;
> + }
> +
> + return mt6370_isnk_brightness_set(&led->isink, led->isink.brightness);
> +}
> +
> +static int mt6370_led_register(struct device *dev, struct mt6370_led *led,
> + struct led_init_data *init_data)
> +{
> + struct mt6370_priv *priv = led->priv;
> + int ret;
> +
> + if (led->index == MT6370_VIRTUAL_MULTICOLOR) {

This too could be split into separate functions to tidy things up a
little.

> + ret = mt6370_mc_brightness_set(&led->mc.led_cdev, 0);
> + if (ret)
> + return dev_err_probe(dev, ret, "Couldn't set multicolor brightness\n");
> +
> + ret = devm_led_classdev_multicolor_register_ext(dev, &led->mc,
> + init_data);
> + if (ret)
> + return dev_err_probe(dev, ret, "Couldn't register multicolor\n");
> + } else {
> + if (led->index == MT6370_LED_ISNK4) {
> + ret = regmap_field_write(priv->fields[F_CHGIND_EN], 1);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to set CHRIND to SW\n");
> + }
> +
> + ret = mt6370_isnk_init_default_state(led);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to init %d isnk state\n",
> + led->index);
> +
> + ret = devm_led_classdev_register_ext(dev, &led->isink,
> + init_data);
> + if (ret)
> + return dev_err_probe(dev, ret, "Couldn't register isink %d\n", led->index);
> + }
> +
> + return 0;
> +}
> +
> +static int mt6370_check_vendor_info(struct mt6370_priv *priv)
> +{
> + unsigned int devinfo, vid;
> + int ret;
> +
> + ret = regmap_read(priv->regmap, MT6370_REG_DEV_INFO, &devinfo);
> + if (ret)
> + return ret;
> +
> + vid = FIELD_GET(MT6370_VENID_MASK, devinfo);
> + if (vid == 0x9 || vid == 0xb) {

Are there nice human readable associates of these (vendor?) IDS?

> + priv->reg_fields = mt6372_reg_fields;
> + priv->ranges = mt6372_led_ranges;
> + priv->pdata = &mt6372_pdata;
> + } else {
> + /* Common for MT6370/71 */
> + priv->reg_fields = common_reg_fields;
> + priv->ranges = common_led_ranges;
> + priv->pdata = &common_pdata;
> + }
> +
> + return 0;
> +}
> +
> +static int mt6370_leds_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct mt6370_priv *priv;
> + struct fwnode_handle *child;
> + size_t count;
> + unsigned int i = 0;
> + int ret;
> +
> + count = device_get_child_node_count(dev);
> + if (!count || count > MT6370_MAX_LEDS)
> + return dev_err_probe(dev, -EINVAL,
> + "No child node or node count over max LED number %zu\n",
> + count);
> +
> + priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->leds_count = count;
> + mutex_init(&priv->lock);
> +
> + priv->regmap = dev_get_regmap(dev->parent, NULL);
> + if (!priv->regmap)
> + return dev_err_probe(dev, -ENODEV, "Failed to get parent regmap\n");
> +
> + ret = mt6370_check_vendor_info(priv);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to check vendor info\n");
> +
> + ret = devm_regmap_field_bulk_alloc(dev, priv->regmap, priv->fields,
> + priv->reg_fields, F_MAX_FIELDS);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to allocate regmap field\n");
> +
> + device_for_each_child_node(dev, child) {
> + struct mt6370_led *led = priv->leds + i++;
> + struct led_init_data init_data = { .fwnode = child };
> + u32 reg, color;
> +
> + ret = fwnode_property_read_u32(child, "reg", &reg);
> + if (ret) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, ret, "Failed to parse reg property\n");
> + }
> +
> + if (reg >= MT6370_MAX_LEDS) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, -EINVAL, "Error reg property number\n");
> + }
> +
> + ret = fwnode_property_read_u32(child, "color", &color);
> + if (ret) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, ret, "Failed to parse color property\n");
> + }
> +
> + if (color == LED_COLOR_ID_RGB || color == LED_COLOR_ID_MULTI)
> + reg = MT6370_VIRTUAL_MULTICOLOR;
> +
> + if (priv->leds_active & BIT(reg)) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, -EINVAL, "Duplicate reg property\n");
> + }
> +
> + priv->leds_active |= BIT(reg);
> +
> + led->index = reg;
> + led->priv = priv;
> +
> + ret = mt6370_init_led_properties(dev, led, &init_data);
> + if (ret) {
> + fwnode_handle_put(child);

I count 6 calls to fwnode_handle_put() here.

Please use a goto to divert the error handling to the bottom of the
function where you call fwnode_handle_put() just once.

> + return ret;
> + }
> +
> + ret = mt6370_led_register(dev, led, &init_data);
> + if (ret) {
> + fwnode_handle_put(child);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mt6370_rgbled_device_table[] = {
> + { .compatible = "mediatek,mt6370-indicator" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, mt6370_rgbled_device_table);
> +
> +static struct platform_driver mt6370_rgbled_driver = {
> + .driver = {
> + .name = "mt6370-indicator",
> + .of_match_table = mt6370_rgbled_device_table,
> + },
> + .probe = mt6370_leds_probe,
> +};
> +module_platform_driver(mt6370_rgbled_driver);
> +
> +MODULE_AUTHOR("Alice Chen <alice_chen@xxxxxxxxxxx>");
> +MODULE_AUTHOR("ChiYuan Huang <cy_huang@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("MediaTek MT6370 RGB LED Driver");
> +MODULE_LICENSE("GPL");
> --
> 2.7.4
>

--
Lee Jones [李琼斯]