Message-ID: <Y9OlmCZ+7NpKztee@google.com>
Date:   Fri, 27 Jan 2023 10:21:12 +0000
From:   Lee Jones <lee@...nel.org>
To:     ChiaEn Wu <chiaen@...htek.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     pavel@....cz, matthias.bgg@...il.com,
        andriy.shevchenko@...ux.intel.com, peterwu.pub@...il.com,
        cy_huang@...htek.com, linux-leds@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        szunichen@...il.com, Alice Chen <alice_chen@...htek.com>,
        ChiaEn Wu <chiaen_wu@...htek.com>
Subject: Re: [PATCH v16 1/2] leds: rgb: mt6370: Add MediaTek MT6370 current
 sink type LED Indicator support

Jacek, Andy,

On Tue, 17 Jan 2023, ChiaEn Wu wrote:

> From: ChiYuan Huang <cy_huang@...htek.com>
> 
> 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.
> 
> Co-developed-by: Alice Chen <alice_chen@...htek.com>
> Signed-off-by: Alice Chen <alice_chen@...htek.com>
> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> Signed-off-by: ChiaEn Wu <chiaen_wu@...htek.com>
> ---
> 
> v16
> - Remove blank line in the head text.
> - Move 'pwm_duty' to descrease the size of struct mt6370_pdata.
> - Move the field 'F_RGB_EN' write out from if/else in
>   'mt6370_isnk_brightness_set'.
> - Remove 'dev' in struct mt6370_priv.
> - Remove the proprety reading for 'linux,default-trigger', led core
>   already did it.
> - Change the module license from 'GPL v2' to 'GPL'
>   In the head text, already deslcred SPDX license as 'GPL-2.0-only'.
> ---
>  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

I see that you guys have been super helpful reviewing this in the past.
                                                                       
Have your queries now been addressed?

> 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..2a5d582
> --- /dev/null
> +++ b/drivers/leds/rgb/leds-mt6370-rgb.c
> @@ -0,0 +1,1009 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2022 Richtek Technology Corp.
> + *
> + * Authors:
> + *   ChiYuan Huang <cy_huang@...htek.com>
> + *   Alice Chen <alice_chen@...htek.com>
> + */
> +
> +#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)
> +#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]
> +	 * 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);
> +			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) {
> +		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) {
> +		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) {
> +		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);
> +			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@...htek.com>");
> +MODULE_AUTHOR("ChiYuan Huang <cy_huang@...htek.com>");
> +MODULE_DESCRIPTION("MediaTek MT6370 RGB LED Driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.7.4
> 

-- 
Lee Jones [李琼斯]

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