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Message-ID: <b6a09f76-3663-9bce-e009-24e31940517e@gmail.com>
Date: Sat, 21 Sep 2019 17:11:07 +0200
From: Jacek Anaszewski <jacek.anaszewski@...il.com>
To: Dan Murphy <dmurphy@...com>, pavel@....cz
Cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 8/9] leds: lp50xx: Add the LP50XX family of the RGB LED
driver
Dan,
On 9/20/19 7:41 PM, Dan Murphy wrote:
> Introduce the LP5036/30/24/18/12/9 RGB LED driver.
> The difference in these parts are the number of
> LED outputs where the:
>
> LP5036 can control 36 LEDs
> LP5030 can control 30 LEDs
> LP5024 can control 24 LEDs
> LP5018 can control 18 LEDs
> LP5012 can control 12 LEDs
> LP509 can control 9 LEDs
>
> The device has the ability to group LED output into control banks
> so that multiple LED banks can be controlled with the same mixing and
> brightness. Inversely the LEDs can also be controlled independently.
>
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
> drivers/leds/Kconfig | 7 +
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-lp50xx.c | 785 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 793 insertions(+)
> create mode 100644 drivers/leds/leds-lp50xx.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index cfb1ebb6517f..1c0cacb100e6 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -363,6 +363,13 @@ config LEDS_LP3952
> To compile this driver as a module, choose M here: the
> module will be called leds-lp3952.
>
> +config LEDS_LP50XX
> + tristate "LED Support for TI LP5036/30/24/18 LED driver chip"
> + depends on LEDS_CLASS && REGMAP_I2C
&& OF
> + help
> + If you say yes here you get support for the Texas Instruments
> + LP5036, LP5030, LP5024 and LP5018 LED driver.
Please add also this standard sentence for a module.
> +
> config LEDS_LP55XX_COMMON
> tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
> depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 841038cfe35b..7a208a0f7b84 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -34,6 +34,7 @@ obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
> obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
> obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
> obj-$(CONFIG_LEDS_LP3952) += leds-lp3952.o
> +obj-$(CONFIG_LEDS_LP50XX) += leds-lp50xx.o
> obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
> obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
> obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
> diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c
> new file mode 100644
> index 000000000000..3ddc14f53eae
> --- /dev/null
> +++ b/drivers/leds/leds-lp50xx.c
> @@ -0,0 +1,785 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// TI LP50XX LED chip family driver
> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/leds.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +#include <uapi/linux/uleds.h>
> +
> +#include <linux/led-class-multicolor.h>
> +
> +#define LP50XX_DEV_CFG0 0x00
> +#define LP50XX_DEV_CFG1 0x01
> +#define LP50XX_LED_CFG0 0x02
> +
> +/* LP5009 and LP5012 registers */
> +#define LP5012_BNK_BRT 0x03
> +#define LP5012_BNKA_CLR 0x04
> +#define LP5012_BNKB_CLR 0x05
> +#define LP5012_BNKC_CLR 0x06
> +#define LP5012_LED0_BRT 0x07
> +#define LP5012_LED1_BRT 0x08
> +#define LP5012_LED2_BRT 0x09
> +#define LP5012_LED3_BRT 0x0a
> +#define LP5012_OUT0_CLR 0x0b
> +#define LP5012_OUT1_CLR 0x0c
> +#define LP5012_OUT2_CLR 0x0d
> +#define LP5012_OUT3_CLR 0x0e
> +#define LP5012_OUT4_CLR 0x0f
> +#define LP5012_OUT5_CLR 0x10
> +#define LP5012_OUT6_CLR 0x11
> +#define LP5012_OUT7_CLR 0x12
> +#define LP5012_OUT8_CLR 0x13
> +#define LP5012_OUT9_CLR 0x14
> +#define LP5012_OUT10_CLR 0x15
> +#define LP5012_OUT11_CLR 0x16
> +#define LP5012_RESET 0x17
> +
> +/* LP5018 and LP5024 registers */
> +#define LP5024_BNK_BRT 0x03
> +#define LP5024_BNKA_CLR 0x04
> +#define LP5024_BNKB_CLR 0x05
> +#define LP5024_BNKC_CLR 0x06
> +#define LP5024_LED0_BRT 0x07
> +#define LP5024_LED1_BRT 0x08
> +#define LP5024_LED2_BRT 0x09
> +#define LP5024_LED3_BRT 0x0a
> +#define LP5024_LED4_BRT 0x0b
> +#define LP5024_LED5_BRT 0x0c
> +#define LP5024_LED6_BRT 0x0d
> +#define LP5024_LED7_BRT 0x0e
> +
> +#define LP5024_OUT0_CLR 0x0f
> +#define LP5024_OUT1_CLR 0x10
> +#define LP5024_OUT2_CLR 0x11
> +#define LP5024_OUT3_CLR 0x12
> +#define LP5024_OUT4_CLR 0x13
> +#define LP5024_OUT5_CLR 0x14
> +#define LP5024_OUT6_CLR 0x15
> +#define LP5024_OUT7_CLR 0x16
> +#define LP5024_OUT8_CLR 0x17
> +#define LP5024_OUT9_CLR 0x18
> +#define LP5024_OUT10_CLR 0x19
> +#define LP5024_OUT11_CLR 0x1a
> +#define LP5024_OUT12_CLR 0x1b
> +#define LP5024_OUT13_CLR 0x1c
> +#define LP5024_OUT14_CLR 0x1d
> +#define LP5024_OUT15_CLR 0x1e
> +#define LP5024_OUT16_CLR 0x1f
> +#define LP5024_OUT17_CLR 0x20
> +#define LP5024_OUT18_CLR 0x21
> +#define LP5024_OUT19_CLR 0x22
> +#define LP5024_OUT20_CLR 0x23
> +#define LP5024_OUT21_CLR 0x24
> +#define LP5024_OUT22_CLR 0x25
> +#define LP5024_OUT23_CLR 0x26
> +#define LP5024_RESET 0x27
> +
> +/* LP5030 and LP5036 registers */
> +#define LP5036_LED_CFG1 0x03
> +#define LP5036_BNK_BRT 0x04
> +#define LP5036_BNKA_CLR 0x05
> +#define LP5036_BNKB_CLR 0x06
> +#define LP5036_BNKC_CLR 0x07
> +#define LP5036_LED0_BRT 0x08
> +#define LP5036_LED1_BRT 0x09
> +#define LP5036_LED2_BRT 0x0a
> +#define LP5036_LED3_BRT 0x0b
> +#define LP5036_LED4_BRT 0x0c
> +#define LP5036_LED5_BRT 0x0d
> +#define LP5036_LED6_BRT 0x0e
> +#define LP5036_LED7_BRT 0x0f
> +#define LP5036_LED8_BRT 0x10
> +#define LP5036_LED9_BRT 0x11
> +#define LP5036_LED10_BRT 0x12
> +#define LP5036_LED11_BRT 0x13
> +
> +#define LP5036_OUT0_CLR 0x14
> +#define LP5036_OUT1_CLR 0x15
> +#define LP5036_OUT2_CLR 0x16
> +#define LP5036_OUT3_CLR 0x17
> +#define LP5036_OUT4_CLR 0x18
> +#define LP5036_OUT5_CLR 0x19
> +#define LP5036_OUT6_CLR 0x1a
> +#define LP5036_OUT7_CLR 0x1b
> +#define LP5036_OUT8_CLR 0x1c
> +#define LP5036_OUT9_CLR 0x1d
> +#define LP5036_OUT10_CLR 0x1e
> +#define LP5036_OUT11_CLR 0x1f
> +#define LP5036_OUT12_CLR 0x20
> +#define LP5036_OUT13_CLR 0x21
> +#define LP5036_OUT14_CLR 0x22
> +#define LP5036_OUT15_CLR 0x23
> +#define LP5036_OUT16_CLR 0x24
> +#define LP5036_OUT17_CLR 0x25
> +#define LP5036_OUT18_CLR 0x26
> +#define LP5036_OUT19_CLR 0x27
> +#define LP5036_OUT20_CLR 0x28
> +#define LP5036_OUT21_CLR 0x29
> +#define LP5036_OUT22_CLR 0x2a
> +#define LP5036_OUT23_CLR 0x2b
> +#define LP5036_OUT24_CLR 0x2c
> +#define LP5036_OUT25_CLR 0x2d
> +#define LP5036_OUT26_CLR 0x2e
> +#define LP5036_OUT27_CLR 0x2f
> +#define LP5036_OUT28_CLR 0x30
> +#define LP5036_OUT29_CLR 0x31
> +#define LP5036_OUT30_CLR 0x32
> +#define LP5036_OUT31_CLR 0x33
> +#define LP5036_OUT32_CLR 0x34
> +#define LP5036_OUT33_CLR 0x35
> +#define LP5036_OUT34_CLR 0x36
> +#define LP5036_OUT35_CLR 0x37
> +#define LP5036_RESET 0x38
> +
> +#define LP50XX_SW_RESET 0xff
> +#define LP50XX_CHIP_EN BIT(6)
> +
> +#define LP5009_MAX_LED_MODULES 2
> +#define LP5012_MAX_LED_MODULES 4
> +#define LP5018_MAX_LED_MODULES 6
> +#define LP5024_MAX_LED_MODULES 8
> +#define LP5030_MAX_LED_MODULES 10
> +#define LP5036_MAX_LED_MODULES 12
> +
> +struct lp50xx_led {
> + struct led_classdev led_dev;
> + struct led_classdev_mc mc_cdev;
> + struct lp50xx *priv;
> + unsigned long bank_modules;
> + int led_intensity[LED_COLOR_ID_MAX];
This is waste of memory. There should be only three elements.
> + u8 ctrl_bank_enabled;
> + int led_number;
> +};
> +
> +/**
> + * struct lp50xx -
> + * @enable_gpio: Hardware enable gpio
> + * @regulator: LED supply regulator pointer
> + * @client: Pointer to the I2C client
> + * @regmap: Devices register map
Device or Device's ?
> + * @dev: Pointer to the devices device struct
> + * @lock: Lock for reading/writing the device
> + * @chip_info: chip specific information (ie num_leds)
> + * @num_of_banked_leds: holds the number of banked LEDs
> + * @leds: Array of LED strings
> + */
> +struct lp50xx {
> + struct gpio_desc *enable_gpio;
> + struct regulator *regulator;
> + struct i2c_client *client;
> + struct regmap *regmap;
> + struct device *dev;
> + struct mutex lock;
> + const struct lp50xx_chip_info *chip_info;
> + int num_of_banked_leds;
> +
> + /* This needs to be at the end of the struct */
> + struct lp50xx_led leds[];
> +};
> +
> +static const struct reg_default lp5012_reg_defs[] = {
> + {LP50XX_DEV_CFG0, 0x0},
> + {LP50XX_DEV_CFG1, 0x3c},
> + {LP50XX_LED_CFG0, 0x0},
> + {LP5012_BNK_BRT, 0xff},
> + {LP5012_BNKA_CLR, 0x0f},
> + {LP5012_BNKB_CLR, 0x0f},
> + {LP5012_BNKC_CLR, 0x0f},
> + {LP5012_LED0_BRT, 0x0f},
> + {LP5012_LED1_BRT, 0xff},
> + {LP5012_LED2_BRT, 0xff},
> + {LP5012_LED3_BRT, 0xff},
> + {LP5012_OUT0_CLR, 0x0f},
> + {LP5012_OUT1_CLR, 0x00},
> + {LP5012_OUT2_CLR, 0x00},
> + {LP5012_OUT3_CLR, 0x00},
> + {LP5012_OUT4_CLR, 0x00},
> + {LP5012_OUT5_CLR, 0x00},
> + {LP5012_OUT6_CLR, 0x00},
> + {LP5012_OUT7_CLR, 0x00},
> + {LP5012_OUT8_CLR, 0x00},
> + {LP5012_OUT9_CLR, 0x00},
> + {LP5012_OUT10_CLR, 0x00},
> + {LP5012_OUT11_CLR, 0x00},
> + {LP5012_RESET, 0x00}
> +};
> +
> +static const struct reg_default lp5024_reg_defs[] = {
> + {LP50XX_DEV_CFG0, 0x0},
> + {LP50XX_DEV_CFG1, 0x3c},
> + {LP50XX_LED_CFG0, 0x0},
> + {LP5024_BNK_BRT, 0xff},
> + {LP5024_BNKA_CLR, 0x0f},
> + {LP5024_BNKB_CLR, 0x0f},
> + {LP5024_BNKC_CLR, 0x0f},
> + {LP5024_LED0_BRT, 0x0f},
> + {LP5024_LED1_BRT, 0xff},
> + {LP5024_LED2_BRT, 0xff},
> + {LP5024_LED3_BRT, 0xff},
> + {LP5024_LED4_BRT, 0xff},
> + {LP5024_LED5_BRT, 0xff},
> + {LP5024_LED6_BRT, 0xff},
> + {LP5024_LED7_BRT, 0xff},
> + {LP5024_OUT0_CLR, 0x0f},
> + {LP5024_OUT1_CLR, 0x00},
> + {LP5024_OUT2_CLR, 0x00},
> + {LP5024_OUT3_CLR, 0x00},
> + {LP5024_OUT4_CLR, 0x00},
> + {LP5024_OUT5_CLR, 0x00},
> + {LP5024_OUT6_CLR, 0x00},
> + {LP5024_OUT7_CLR, 0x00},
> + {LP5024_OUT8_CLR, 0x00},
> + {LP5024_OUT9_CLR, 0x00},
> + {LP5024_OUT10_CLR, 0x00},
> + {LP5024_OUT11_CLR, 0x00},
> + {LP5024_OUT12_CLR, 0x00},
> + {LP5024_OUT13_CLR, 0x00},
> + {LP5024_OUT14_CLR, 0x00},
> + {LP5024_OUT15_CLR, 0x00},
> + {LP5024_OUT16_CLR, 0x00},
> + {LP5024_OUT17_CLR, 0x00},
> + {LP5024_OUT18_CLR, 0x00},
> + {LP5024_OUT19_CLR, 0x00},
> + {LP5024_OUT20_CLR, 0x00},
> + {LP5024_OUT21_CLR, 0x00},
> + {LP5024_OUT22_CLR, 0x00},
> + {LP5024_OUT23_CLR, 0x00},
> + {LP5024_RESET, 0x00}
> +};
> +
> +static const struct reg_default lp5036_reg_defs[] = {
> + {LP50XX_DEV_CFG0, 0x0},
> + {LP50XX_DEV_CFG1, 0x3c},
> + {LP50XX_LED_CFG0, 0x0},
> + {LP5036_LED_CFG1, 0x0},
> + {LP5036_BNK_BRT, 0xff},
> + {LP5036_BNKA_CLR, 0x0f},
> + {LP5036_BNKB_CLR, 0x0f},
> + {LP5036_BNKC_CLR, 0x0f},
> + {LP5036_LED0_BRT, 0x0f},
> + {LP5036_LED1_BRT, 0xff},
> + {LP5036_LED2_BRT, 0xff},
> + {LP5036_LED3_BRT, 0xff},
> + {LP5036_LED4_BRT, 0xff},
> + {LP5036_LED5_BRT, 0xff},
> + {LP5036_LED6_BRT, 0xff},
> + {LP5036_LED7_BRT, 0xff},
> + {LP5036_OUT0_CLR, 0x0f},
> + {LP5036_OUT1_CLR, 0x00},
> + {LP5036_OUT2_CLR, 0x00},
> + {LP5036_OUT3_CLR, 0x00},
> + {LP5036_OUT4_CLR, 0x00},
> + {LP5036_OUT5_CLR, 0x00},
> + {LP5036_OUT6_CLR, 0x00},
> + {LP5036_OUT7_CLR, 0x00},
> + {LP5036_OUT8_CLR, 0x00},
> + {LP5036_OUT9_CLR, 0x00},
> + {LP5036_OUT10_CLR, 0x00},
> + {LP5036_OUT11_CLR, 0x00},
> + {LP5036_OUT12_CLR, 0x00},
> + {LP5036_OUT13_CLR, 0x00},
> + {LP5036_OUT14_CLR, 0x00},
> + {LP5036_OUT15_CLR, 0x00},
> + {LP5036_OUT16_CLR, 0x00},
> + {LP5036_OUT17_CLR, 0x00},
> + {LP5036_OUT18_CLR, 0x00},
> + {LP5036_OUT19_CLR, 0x00},
> + {LP5036_OUT20_CLR, 0x00},
> + {LP5036_OUT21_CLR, 0x00},
> + {LP5036_OUT22_CLR, 0x00},
> + {LP5036_OUT23_CLR, 0x00},
> + {LP5036_OUT24_CLR, 0x00},
> + {LP5036_OUT25_CLR, 0x00},
> + {LP5036_OUT26_CLR, 0x00},
> + {LP5036_OUT27_CLR, 0x00},
> + {LP5036_OUT28_CLR, 0x00},
> + {LP5036_OUT29_CLR, 0x00},
> + {LP5036_OUT30_CLR, 0x00},
> + {LP5036_OUT31_CLR, 0x00},
> + {LP5036_OUT32_CLR, 0x00},
> + {LP5036_OUT33_CLR, 0x00},
> + {LP5036_OUT34_CLR, 0x00},
> + {LP5036_OUT35_CLR, 0x00},
> + {LP5036_RESET, 0x00}
> +};
> +
> +static const struct regmap_config lp5012_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +
> + .max_register = LP5012_RESET,
> + .reg_defaults = lp5012_reg_defs,
> + .num_reg_defaults = ARRAY_SIZE(lp5012_reg_defs),
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static const struct regmap_config lp5024_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +
> + .max_register = LP5024_RESET,
> + .reg_defaults = lp5024_reg_defs,
> + .num_reg_defaults = ARRAY_SIZE(lp5024_reg_defs),
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static const struct regmap_config lp5036_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +
> + .max_register = LP5036_RESET,
> + .reg_defaults = lp5036_reg_defs,
> + .num_reg_defaults = ARRAY_SIZE(lp5036_reg_defs),
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +enum lp50xx_model {
> + LP5009,
> + LP5012,
> + LP5018,
> + LP5024,
> + LP5030,
> + LP5036,
> +};
> +
> +/*
> + * struct lp50xx_chip_info -
> + * @num_leds: number of LED outputs available on the device
> + * @led_brightness0_reg: first brightness register of the device
> + * @mix_out0_reg: first color mix register of the device
> + * @bank_brt_reg: bank brightness register
> + * @bank_mix_reg: color mix register
> + * @reset_reg: devices reset register
s/devices/device/
Please be consequent: I prefer starting the property description
always with lower case.
> + */
> +struct lp50xx_chip_info {
> + struct regmap_config lp50xx_regmap_config;
> + u8 num_leds;
> + u8 led_brightness0_reg;
> + u8 mix_out0_reg;
> + u8 bank_brt_reg;
> + u8 bank_mix_reg;
> + u8 reset_reg;
> +};
> +
> +static const struct lp50xx_chip_info lp50xx_chip_info_tbl[] = {
> + [LP5009] = {
> + .num_leds = LP5009_MAX_LED_MODULES,
> + .led_brightness0_reg = LP5012_LED0_BRT,
> + .mix_out0_reg = LP5012_OUT0_CLR,
> + .bank_brt_reg = LP5012_BNK_BRT,
> + .bank_mix_reg = LP5012_BNKA_CLR,
> + .reset_reg = LP5012_RESET,
> + .lp50xx_regmap_config = lp5012_regmap_config,
> + },
> + [LP5012] = {
> + .num_leds = LP5012_MAX_LED_MODULES,
> + .led_brightness0_reg = LP5012_LED0_BRT,
> + .mix_out0_reg = LP5012_OUT0_CLR,
> + .bank_brt_reg = LP5012_BNK_BRT,
> + .bank_mix_reg = LP5012_BNKA_CLR,
> + .reset_reg = LP5012_RESET,
> + .lp50xx_regmap_config = lp5012_regmap_config,
> + },
> + [LP5018] = {
> + .num_leds = LP5018_MAX_LED_MODULES,
> + .led_brightness0_reg = LP5024_LED0_BRT,
> + .mix_out0_reg = LP5024_OUT0_CLR,
> + .bank_brt_reg = LP5024_BNK_BRT,
> + .bank_mix_reg = LP5024_BNKA_CLR,
> + .reset_reg = LP5024_RESET,
> + .lp50xx_regmap_config = lp5024_regmap_config,
> + },
> + [LP5024] = {
> + .num_leds = LP5024_MAX_LED_MODULES,
> + .led_brightness0_reg = LP5024_LED0_BRT,
> + .mix_out0_reg = LP5024_OUT0_CLR,
> + .bank_brt_reg = LP5024_BNK_BRT,
> + .bank_mix_reg = LP5024_BNKA_CLR,
> + .reset_reg = LP5024_RESET,
> + .lp50xx_regmap_config = lp5024_regmap_config,
> + },
> + [LP5030] = {
> + .num_leds = LP5030_MAX_LED_MODULES,
> + .led_brightness0_reg = LP5036_LED0_BRT,
> + .mix_out0_reg = LP5036_OUT0_CLR,
> + .bank_brt_reg = LP5036_BNK_BRT,
> + .bank_mix_reg = LP5036_BNKA_CLR,
> + .reset_reg = LP5036_RESET,
> + .lp50xx_regmap_config = lp5036_regmap_config,
> + },
> + [LP5036] = {
> + .num_leds = LP5036_MAX_LED_MODULES,
> + .led_brightness0_reg = LP5036_LED0_BRT,
> + .mix_out0_reg = LP5036_OUT0_CLR,
> + .bank_brt_reg = LP5036_BNK_BRT,
> + .bank_mix_reg = LP5036_BNKA_CLR,
> + .reset_reg = LP5036_RESET,
> + .lp50xx_regmap_config = lp5036_regmap_config,
> + },
> +};
> +
> +static struct lp50xx_led *mcled_cdev_to_led(struct led_classdev_mc *mcled_cdev)
> +{
> + return container_of(mcled_cdev, struct lp50xx_led, mc_cdev);
> +}
> +
> +static int lp50xx_set_intensity(struct lp50xx_led *led)
> +{
> + struct lp50xx *priv = led->priv;
> + u8 led_offset, reg_number, reg_color_off;
reg_color_off feels like "turning the color off"
Let's have full reg_color_offset form.
> + int i, ret = -EINVAL;
> +
> + for (i = 0; i <= LED_COLOR_ID_MAX; i++) {
> + if (!test_bit(i, &led->mc_cdev.available_colors))
> + continue;
> +
> + if (i == LED_COLOR_ID_RED)
> + reg_color_off = 0;
> + else if (i == LED_COLOR_ID_GREEN)
> + reg_color_off = 1;
> + else if (i == LED_COLOR_ID_BLUE)
> + reg_color_off = 2;
> + else
> + continue;
> +
> + if (led->ctrl_bank_enabled) {
> + reg_number = priv->chip_info->bank_mix_reg + reg_color_off;
> + } else {
> + led_offset = (led->led_number * 3) + reg_color_off;
> + reg_number = priv->chip_info->mix_out0_reg + led_offset;
> + }
> +
> + ret = regmap_write(priv->regmap, reg_number,
> + led->led_intensity[i]);
> + if (ret) {
> + dev_err(&priv->client->dev, "Cannot write LED value\n");
> + goto out;
> + }
> + }
> +out:
> + return ret;
> +}
> +
> +static int lp50xx_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct lp50xx_led *led = container_of(cdev, struct lp50xx_led, led_dev);
> + int ret = 0;
> + u8 reg_val;
> +
> + mutex_lock(&led->priv->lock);
> +
> + if (led->ctrl_bank_enabled)
> + reg_val = led->priv->chip_info->bank_brt_reg;
> + else
> + reg_val = led->priv->chip_info->led_brightness0_reg +
> + led->led_number;
> +
> + ret = regmap_write(led->priv->regmap, reg_val, brightness);
> + if (ret)
> + goto err_out;
> +
> + ret = lp50xx_set_intensity(led);
> +err_out:
> + mutex_unlock(&led->priv->lock);
> + return ret;
> +}
> +
> +static enum led_brightness lp50xx_brightness_get(struct led_classdev *cdev)
Do we really need this op? Is it possible that the device will alter
brightness autonomously ? IOW can't we rely on what we've written
previously to the hw?
> +{
> + struct lp50xx_led *led = container_of(cdev, struct lp50xx_led, led_dev);
> + unsigned int brt_val;
> + u8 reg_val;
> + int ret;
> +
> + mutex_lock(&led->priv->lock);
> +
> + if (led->ctrl_bank_enabled)
> + reg_val = led->priv->chip_info->bank_brt_reg;
> + else
> + reg_val = led->priv->chip_info->led_brightness0_reg + led->led_number;
> +
> + ret = regmap_read(led->priv->regmap, reg_val, &brt_val);
> +
> + mutex_unlock(&led->priv->lock);
> +
> + return brt_val;
> +}
> +
> +static int lp50xx_set_color(struct led_classdev_mc *mcled_cdev,
> + int color, int value)
> +{
> + struct lp50xx_led *led = mcled_cdev_to_led(mcled_cdev);
> +
> + led->led_intensity[color] = value;
> +
> + return 0;
> +}
> +
> +static int lp50xx_set_banks(struct lp50xx *priv, u32 led_strings[])
This is a bit misleading to introduce "strings" when the function
claims to set "banks". Let's have the parameter name "led_banks".
> +{
> + u8 led_ctrl_enable = 0;
> + u8 led1_ctrl_enable = 0;
> + u8 ctrl_ext = 0;
Let's have below instead of the above three variables:
u32 bank_enable_mask = 0;
u8 led_config_lo, led_config_hi;
> + int ret;
> + int j;
This is subjective, but why j? We usually have 'i' for one level loop.
> +
> + for (j = 0; j <= priv->chip_info->num_leds - 1; j++) {
> + if (led_strings[j] > (LP5024_MAX_LED_MODULES - 1)) {
> + ctrl_ext = led_strings[j] - LP5024_MAX_LED_MODULES;
> + led1_ctrl_enable |= (1 << ctrl_ext)> + } else {
> + led_ctrl_enable |= (1 << led_strings[j]);
> + }
> + }
This looks harder than it should be.
for (i = 0; i < priv->chip_info->num_leds; i++)
bank_enable_mask |= (1 << led_banks[i]);
led_config_lo = (u8)(bank_enable_mask & 0xff);
led_config_hi = (u8)(bank_enable_mask >> 8) & 0xff);
> +
> + ret = regmap_write(priv->regmap, LP50XX_LED_CFG0, led_ctrl_enable);
ret = regmap_write(priv->regmap, LP50XX_LED_CFG0, led_config_lo);
if (ret)
return ret;
> +
> + if (led1_ctrl_enable)
> + ret = regmap_write(priv->regmap, LP5036_LED_CFG1,
> + led1_ctrl_enable);
if (led_config_hi)
ret = regmap_write(priv->regmap, LP5036_LED_CFG1,
led_config_hi);
> +
> + return ret;
> +}
> +
> +static int lp50xx_reset(struct lp50xx *priv)
> +{
> + if (priv->enable_gpio)
> + return gpiod_direction_output(priv->enable_gpio, 1);
> + else
> + return regmap_write(priv->regmap, priv->chip_info->reset_reg,
> + LP50XX_SW_RESET);
> +}
> +
> +static int lp50xx_enable_disable(struct lp50xx *priv, u8 enable_disable)
> +{
> + return regmap_write(priv->regmap, LP50XX_DEV_CFG0, enable_disable);
> +}
> +
> +static int lp50xx_probe_dt(struct lp50xx *priv)
> +{
> + u32 led_strings[LP5036_MAX_LED_MODULES];
s/led_strings/led_banks/
> + struct fwnode_handle *child = NULL;
> + struct fwnode_handle *led_node = NULL;
> + struct led_init_data init_data;
> + struct lp50xx_led *led;
> + int num_colors;
> + u32 color_id;
> + int led_number;
> + size_t i = 0;
> + int ret;
> +
> + priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
> + "enable", GPIOD_OUT_LOW);
> + if (IS_ERR(priv->enable_gpio)) {
> + ret = PTR_ERR(priv->enable_gpio);
> + dev_err(&priv->client->dev, "Failed to get enable gpio: %d\n",
> + ret);
> + return ret;
> + }
> +
> + priv->regulator = devm_regulator_get(&priv->client->dev, "vled");
> + if (IS_ERR(priv->regulator))
> + priv->regulator = NULL;
> +
> + device_for_each_child_node(&priv->client->dev, child) {
> + led = &priv->leds[i];
> + if (fwnode_property_present(child, "ti,led-bank")) {
> + ret = fwnode_property_read_u32_array(child,
> + "ti,led-bank",
> + NULL, 0);
> + ret = fwnode_property_read_u32_array(child,
> + "ti,led-bank",
> + led_strings,
> + ret);
> +
> + priv->num_of_banked_leds = ARRAY_SIZE(led_strings);
> +
> + ret = lp50xx_set_banks(priv, led_strings);
> + if (ret) {
> + dev_err(&priv->client->dev,
> + "Cannot setup banked LEDs\n");
> + fwnode_handle_put(child);
> + goto child_out;
> + }
> + led->ctrl_bank_enabled = 1;
> +
> + } else {
> + ret = fwnode_property_read_u32(child, "reg",
> + &led_number);
> +
> + led->led_number = led_number;
> + }
> + if (ret) {
> + dev_err(&priv->client->dev,
> + "led sourcing property missing\n");
> + fwnode_handle_put(child);
> + goto child_out;
> + }
> +
> + if (led_number > priv->chip_info->num_leds) {
> + dev_err(&priv->client->dev,
> + "led-sources property is invalid\n");
> + ret = -EINVAL;
> + fwnode_handle_put(child);
> + goto child_out;
> + }
> +
> + init_data.fwnode = child;
> + init_data.devicename = priv->client->name;
> + init_data.default_label = ":";
devicename and default_label are for LEDs with mandatory devicename
and for backward compatibility. Neither is pertinent to this driver.
> +
> + fwnode_property_read_string(child, "linux,default-trigger",
> + &led->led_dev.default_trigger);
> + num_colors = 0;
> +
> + fwnode_for_each_child_node(child, led_node) {
> + ret = fwnode_property_read_u32(led_node, "color",
> + &color_id);
> + if (ret)
> + dev_err(&priv->client->dev,
> + "Cannot read color\n");
> +
> + set_bit(color_id, &led->mc_cdev.available_colors);
> + num_colors++;
> +
> + }
> +
> + led->priv = priv;
> + led->mc_cdev.set_color_brightness = lp50xx_set_color;
> + led->mc_cdev.num_leds = num_colors;
> + led->mc_cdev.led_cdev = &led->led_dev;
> + led->led_dev.brightness_set_blocking = lp50xx_brightness_set;
> + led->led_dev.brightness_get = lp50xx_brightness_get;
> + ret = led_classdev_multicolor_register_ext(&priv->client->dev,
> + &led->mc_cdev,
> + &init_data);
> + if (ret) {
> + dev_err(&priv->client->dev, "led register err: %d\n",
> + ret);
> + fwnode_handle_put(child);
> + goto child_out;
> + }
> + i++;
> + }
> +
> +child_out:
> + return ret;
> +}
> +
> +static int lp50xx_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct lp50xx *led;
> + int count;
> + int ret;
> +
> + count = device_get_child_node_count(&client->dev);
> + if (!count) {
> + dev_err(&client->dev, "LEDs are not defined in device tree!");
> + return -ENODEV;
> + }
> +
> + led = devm_kzalloc(&client->dev, struct_size(led, leds, count),
> + GFP_KERNEL);
> + if (!led)
> + return -ENOMEM;
> +
> + mutex_init(&led->lock);
> + led->client = client;
> + led->dev = &client->dev;
> + led->chip_info = &lp50xx_chip_info_tbl[id->driver_data];
> + i2c_set_clientdata(client, led);
> +
> + led->regmap = devm_regmap_init_i2c(client,
> + &led->chip_info->lp50xx_regmap_config);
> + if (IS_ERR(led->regmap)) {
> + ret = PTR_ERR(led->regmap);
> + dev_err(&client->dev, "Failed to allocate register map: %d\n",
> + ret);
> + return ret;
> + }
> +
> + ret = lp50xx_reset(led);
> + if (ret)
> + return ret;
> +
> + ret = lp50xx_probe_dt(led);
> + if (ret)
> + return ret;
> +
> + return lp50xx_enable_disable(led, LP50XX_CHIP_EN);
> +}
> +
> +static int lp50xx_remove(struct i2c_client *client)
> +{
> + struct lp50xx *led = i2c_get_clientdata(client);
> + int ret;
> +
> + ret = lp50xx_enable_disable(led, LP50XX_CHIP_EN);
> + if (ret) {
> + dev_err(&led->client->dev, "Failed to disable regulator\n");
> + return ret;
> + }
> +
> + if (led->enable_gpio)
> + gpiod_direction_output(led->enable_gpio, 0);
> +
> + if (led->regulator) {
> + ret = regulator_disable(led->regulator);
> + if (ret)
> + dev_err(&led->client->dev,
> + "Failed to disable regulator\n");
> + }
> +
> + mutex_destroy(&led->lock);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id lp50xx_id[] = {
> + { "lp5009", LP5009 },
> + { "lp5012", LP5012 },
> + { "lp5018", LP5018 },
> + { "lp5024", LP5024 },
> + { "lp5030", LP5030 },
> + { "lp5036", LP5036 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, lp50xx_id);
> +
> +static const struct of_device_id of_lp50xx_leds_match[] = {
> + { .compatible = "ti,lp5009", .data = (void *)LP5009 },
> + { .compatible = "ti,lp5012", .data = (void *)LP5012 },
> + { .compatible = "ti,lp5018", .data = (void *)LP5018 },
> + { .compatible = "ti,lp5024", .data = (void *)LP5024 },
> + { .compatible = "ti,lp5030", .data = (void *)LP5030 },
> + { .compatible = "ti,lp5036", .data = (void *)LP5036 },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, of_lp50xx_leds_match);
> +
> +static struct i2c_driver lp50xx_driver = {
> + .driver = {
> + .name = "lp50xx",
> + .of_match_table = of_lp50xx_leds_match,
> + },
> + .probe = lp50xx_probe,
> + .remove = lp50xx_remove,
> + .id_table = lp50xx_id,
> +};
> +module_i2c_driver(lp50xx_driver);
> +
> +MODULE_DESCRIPTION("Texas Instruments LP50XX LED driver");
> +MODULE_AUTHOR("Dan Murphy <dmurphy@...com>");
> +MODULE_LICENSE("GPL v2");
>
--
Best regards,
Jacek Anaszewski
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