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backlight: ktz8866: Add support for Kinetic KTZ8866 backlight
Add support for Kinetic KTZ8866 backlight, which is used in Xiaomi tablet, Mi Pad 5 series. This driver lightly based on downstream implementation [1]. [1] https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/elish-r-oss/drivers/video/backlight/ktz8866.c Signed-off-by: Jianhua Lu <lujianhua000@gmail.com> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20230120155018.15376-2-lujianhua000@gmail.com
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@ -11674,6 +11674,12 @@ M: John Hawley <warthog9@eaglescrag.net>
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S: Maintained
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F: tools/testing/ktest
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KTZ8866 BACKLIGHT DRIVER
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M: Jianhua Lu <lujianhua000@gmail.com>
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S: Maintained
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F: Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
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F: drivers/video/backlight/ktz8866.c
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L3MDEV
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M: David Ahern <dsahern@kernel.org>
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L: netdev@vger.kernel.org
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@ -183,6 +183,14 @@ config BACKLIGHT_KTD253
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which is a 1-wire GPIO-controlled backlight found in some mobile
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phones.
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config BACKLIGHT_KTZ8866
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tristate "Backlight Driver for Kinetic KTZ8866"
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depends on I2C
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select REGMAP_I2C
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help
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Say Y to enable the backlight driver for the Kinetic KTZ8866
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found in Xiaomi Mi Pad 5 series.
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config BACKLIGHT_LM3533
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tristate "Backlight Driver for LM3533"
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depends on MFD_LM3533
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@ -35,6 +35,7 @@ obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
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obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
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obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o
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obj-$(CONFIG_BACKLIGHT_KTD253) += ktd253-backlight.o
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obj-$(CONFIG_BACKLIGHT_KTZ8866) += ktz8866.o
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obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
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obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o
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obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
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209
drivers/video/backlight/ktz8866.c
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209
drivers/video/backlight/ktz8866.c
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@ -0,0 +1,209 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Backlight driver for the Kinetic KTZ8866
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*
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* Copyright (C) 2022, 2023 Jianhua Lu <lujianhua000@gmail.com>
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*/
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#define DEFAULT_BRIGHTNESS 1500
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#define MAX_BRIGHTNESS 2047
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#define REG_MAX 0x15
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/* reg */
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#define DEVICE_ID 0x01
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#define BL_CFG1 0x02
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#define BL_CFG2 0x03
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#define BL_BRT_LSB 0x04
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#define BL_BRT_MSB 0x05
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#define BL_EN 0x08
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#define LCD_BIAS_CFG1 0x09
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#define LCD_BIAS_CFG2 0x0A
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#define LCD_BIAS_CFG3 0x0B
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#define LCD_BOOST_CFG 0x0C
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#define OUTP_CFG 0x0D
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#define OUTN_CFG 0x0E
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#define FLAG 0x0F
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#define BL_OPTION1 0x10
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#define BL_OPTION2 0x11
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#define PWM2DIG_LSBs 0x12
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#define PWM2DIG_MSBs 0x13
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#define BL_DIMMING 0x14
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#define PWM_RAMP_TIME 0x15
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/* definition */
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#define BL_EN_BIT BIT(6)
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#define LCD_BIAS_EN 0x9F
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#define PWM_HYST 0x5
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struct ktz8866 {
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struct i2c_client *client;
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struct regmap *regmap;
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bool led_on;
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struct gpio_desc *enable_gpio;
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};
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static const struct regmap_config ktz8866_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = REG_MAX,
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};
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static int ktz8866_write(struct ktz8866 *ktz, unsigned int reg,
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unsigned int val)
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{
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return regmap_write(ktz->regmap, reg, val);
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}
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static int ktz8866_update_bits(struct ktz8866 *ktz, unsigned int reg,
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unsigned int mask, unsigned int val)
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{
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return regmap_update_bits(ktz->regmap, reg, mask, val);
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}
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static int ktz8866_backlight_update_status(struct backlight_device *backlight_dev)
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{
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struct ktz8866 *ktz = bl_get_data(backlight_dev);
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unsigned int brightness = backlight_get_brightness(backlight_dev);
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if (!ktz->led_on && brightness > 0) {
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ktz8866_update_bits(ktz, BL_EN, BL_EN_BIT, BL_EN_BIT);
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ktz->led_on = true;
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} else if (brightness == 0) {
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ktz8866_update_bits(ktz, BL_EN, BL_EN_BIT, 0);
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ktz->led_on = false;
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}
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/* Set brightness */
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ktz8866_write(ktz, BL_BRT_LSB, brightness & 0x7);
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ktz8866_write(ktz, BL_BRT_MSB, (brightness >> 3) & 0xFF);
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return 0;
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}
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static const struct backlight_ops ktz8866_backlight_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = ktz8866_backlight_update_status,
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};
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static void ktz8866_init(struct ktz8866 *ktz)
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{
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unsigned int val = 0;
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if (of_property_read_u32(ktz->client->dev.of_node, "current-num-sinks", &val))
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ktz8866_write(ktz, BL_EN, BIT(val) - 1);
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else
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/* Enable all 6 current sinks if the number of current sinks isn't specified. */
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ktz8866_write(ktz, BL_EN, BIT(6) - 1);
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if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,current-ramp-delay-ms", &val)) {
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if (val <= 128)
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ktz8866_write(ktz, BL_CFG2, BIT(7) | (ilog2(val) << 3) | PWM_HYST);
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else
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ktz8866_write(ktz, BL_CFG2, BIT(7) | ((5 + val / 64) << 3) | PWM_HYST);
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}
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if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,led-enable-ramp-delay-ms", &val)) {
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if (val == 0)
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ktz8866_write(ktz, BL_DIMMING, 0);
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else {
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unsigned int ramp_off_time = ilog2(val) + 1;
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unsigned int ramp_on_time = ramp_off_time << 4;
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ktz8866_write(ktz, BL_DIMMING, ramp_on_time | ramp_off_time);
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}
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}
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if (of_property_read_bool(ktz->client->dev.of_node, "kinetic,enable-lcd-bias"))
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ktz8866_write(ktz, LCD_BIAS_CFG1, LCD_BIAS_EN);
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}
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static int ktz8866_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct backlight_device *backlight_dev;
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struct backlight_properties props;
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struct ktz8866 *ktz;
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int ret = 0;
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ktz = devm_kzalloc(&client->dev, sizeof(*ktz), GFP_KERNEL);
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if (!ktz)
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return -ENOMEM;
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ktz->client = client;
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ktz->regmap = devm_regmap_init_i2c(client, &ktz8866_regmap_config);
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if (IS_ERR(ktz->regmap))
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return dev_err_probe(&client->dev, PTR_ERR(ktz->regmap), "failed to init regmap\n");
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ret = devm_regulator_get_enable(&client->dev, "vddpos");
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if (ret)
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return dev_err_probe(&client->dev, ret, "get regulator vddpos failed\n");
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ret = devm_regulator_get_enable(&client->dev, "vddneg");
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if (ret)
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return dev_err_probe(&client->dev, ret, "get regulator vddneg failed\n");
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ktz->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH);
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if (IS_ERR(ktz->enable_gpio))
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return PTR_ERR(ktz->enable_gpio);
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memset(&props, 0, sizeof(props));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = MAX_BRIGHTNESS;
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props.brightness = DEFAULT_BRIGHTNESS;
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props.scale = BACKLIGHT_SCALE_LINEAR;
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backlight_dev = devm_backlight_device_register(&client->dev, "ktz8866-backlight",
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&client->dev, ktz, &ktz8866_backlight_ops, &props);
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if (IS_ERR(backlight_dev))
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return dev_err_probe(&client->dev, PTR_ERR(backlight_dev),
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"failed to register backlight device\n");
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ktz8866_init(ktz);
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i2c_set_clientdata(client, backlight_dev);
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backlight_update_status(backlight_dev);
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return 0;
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}
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static void ktz8866_remove(struct i2c_client *client)
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{
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struct backlight_device *backlight_dev = i2c_get_clientdata(client);
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backlight_dev->props.brightness = 0;
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backlight_update_status(backlight_dev);
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}
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static const struct i2c_device_id ktz8866_ids[] = {
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{ "ktz8866", 0 },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, ktz8866_ids);
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static const struct of_device_id ktz8866_match_table[] = {
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{
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.compatible = "kinetic,ktz8866",
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},
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{},
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};
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static struct i2c_driver ktz8866_driver = {
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.driver = {
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.name = "ktz8866",
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.of_match_table = ktz8866_match_table,
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},
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.probe = ktz8866_probe,
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.remove = ktz8866_remove,
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.id_table = ktz8866_ids,
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};
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module_i2c_driver(ktz8866_driver);
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MODULE_DESCRIPTION("Kinetic KTZ8866 Backlight Driver");
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MODULE_AUTHOR("Jianhua Lu <lujianhua000@gmail.com>");
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MODULE_LICENSE("GPL");
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