diff options
Diffstat (limited to 'drivers/video/lm3533_backlight.c')
| -rw-r--r-- | drivers/video/lm3533_backlight.c | 142 |
1 files changed, 112 insertions, 30 deletions
diff --git a/drivers/video/lm3533_backlight.c b/drivers/video/lm3533_backlight.c index 6b51fa0628e..7b87b6bd40b 100644 --- a/drivers/video/lm3533_backlight.c +++ b/drivers/video/lm3533_backlight.c @@ -7,6 +7,7 @@ #include <backlight.h> #include <dm.h> +#include <dm/ofnode.h> #include <i2c.h> #include <log.h> #include <linux/delay.h> @@ -17,56 +18,79 @@ #define LM3533_BL_MAX_BRIGHTNESS 0xFF #define LM3533_SINK_OUTPUT_CONFIG_1 0x10 -#define LM3533_CONTROL_BANK_A_PWM 0x14 +#define LM3533_CONTROL_PWM_BASE 0x14 +#define PWM_MAX GENMASK(5, 0) #define LM3533_CONTROL_BANK_AB_BRIGHTNESS 0x1A -#define LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT 0x1F +#define LM3533_CONTROL_FULLSCALE_CURRENT_BASE 0x1F +#define MAX_CURRENT_MIN 5000 +#define MAX_CURRENT_MAX 29800 +#define MAX_CURRENT_STEP 800 #define LM3533_CONTROL_BANK_ENABLE 0x27 #define LM3533_OVP_FREQUENCY_PWM_POLARITY 0x2C +#define BOOST_OVP_MASK GENMASK(2, 1) +#define BOOST_OVP_SHIFT 1 +#define BOOST_FREQ_MASK BIT(0) +#define BOOST_FREQ_SHIFT 0 #define LM3533_BRIGHTNESS_REGISTER_A 0x40 +#define LM3533_BOOST_OVP_16V 16000000UL +#define LM3533_BOOST_FREQ_500KHZ 500000UL + struct lm3533_backlight_priv { struct gpio_desc enable_gpio; u32 def_bl_lvl; + + /* Core */ + u32 boost_ovp; + u32 boost_freq; + + /* Backlight */ + u32 reg; + u16 max_current; /* 5000 - 29800 uA (800 uA step) */ + u8 pwm; /* 0 - 0x3f */ + bool linear; + bool hvled; }; static int lm3533_backlight_enable(struct udevice *dev) { struct lm3533_backlight_priv *priv = dev_get_priv(dev); + u8 val, id = priv->reg; int ret; - dm_gpio_set_value(&priv->enable_gpio, 1); - mdelay(5); + if (priv->linear) { + ret = dm_i2c_reg_clrset(dev, LM3533_CONTROL_BANK_AB_BRIGHTNESS, + BIT(2 * id + 1), BIT(2 * id + 1)); + if (ret) + return ret; + } - /* HVLED 1 & 2 are controlled by Bank A */ - ret = dm_i2c_reg_write(dev, LM3533_SINK_OUTPUT_CONFIG_1, 0x00); - if (ret) - return ret; + if (priv->hvled) { + ret = dm_i2c_reg_clrset(dev, LM3533_SINK_OUTPUT_CONFIG_1, + BIT(0) | BIT(1), id | id << 1); + if (ret) + return ret; + } - /* PWM input is disabled for CABC */ - ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_PWM, 0x00); - if (ret) - return ret; + /* Set current */ + if (priv->max_current < MAX_CURRENT_MIN || priv->max_current > MAX_CURRENT_MAX) + return -EINVAL; - /* Linear & Control Bank A is configured for register Current control */ - ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_AB_BRIGHTNESS, 0x02); + val = (priv->max_current - MAX_CURRENT_MIN) / MAX_CURRENT_STEP; + ret = dm_i2c_reg_write(dev, LM3533_CONTROL_FULLSCALE_CURRENT_BASE + id, val); if (ret) return ret; - /* Full-Scale Current (20.2mA) */ - ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT, 0x13); - if (ret) - return ret; + /* Set PWM mask */ + if (priv->pwm > PWM_MAX) + return -EINVAL; - /* Control Bank A is enable */ - ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_ENABLE, 0x01); + ret = dm_i2c_reg_write(dev, LM3533_CONTROL_PWM_BASE + id, priv->pwm); if (ret) return ret; - ret = dm_i2c_reg_write(dev, LM3533_OVP_FREQUENCY_PWM_POLARITY, 0x0A); - if (ret) - return ret; - - return 0; + /* Enable Control Bank */ + return dm_i2c_reg_clrset(dev, LM3533_CONTROL_BANK_ENABLE, BIT(id), BIT(id)); } static int lm3533_backlight_set_brightness(struct udevice *dev, int percent) @@ -92,6 +116,56 @@ static int lm3533_backlight_set_brightness(struct udevice *dev, int percent) return 0; } +static int lm3533_backlight_of_to_plat(struct udevice *dev) +{ + struct lm3533_backlight_priv *priv = dev_get_priv(dev); + ofnode child; + int ret; + + ret = gpio_request_by_name(dev, "enable-gpios", 0, + &priv->enable_gpio, GPIOD_IS_OUT); + if (ret) { + log_err("Could not decode enable-gpios (%d)\n", ret); + return ret; + } + + priv->boost_ovp = dev_read_u32_default(dev, "ti,boost-ovp-microvolt", + LM3533_BOOST_OVP_16V); + + /* boost_ovp is defined in microvolts, convert to enum value */ + priv->boost_ovp = priv->boost_ovp / (8 * 1000 * 1000) - 2; + + priv->boost_freq = dev_read_u32_default(dev, "ti,boost-freq-hz", + LM3533_BOOST_FREQ_500KHZ); + + /* boost_freq is defined in Hz, convert to enum value */ + priv->boost_freq = priv->boost_freq / (500 * 1000) - 1; + + /* Backlight is one of children but has no dedicated driver */ + ofnode_for_each_subnode(child, dev_ofnode(dev)) { + if (ofnode_device_is_compatible(child, "ti,lm3533-backlight")) { + const char *node_name = ofnode_get_name(child); + + if (!strcmp(&node_name[10], "1")) + priv->reg = 1; + else + priv->reg = 0; + + priv->max_current = ofnode_read_u32_default(child, "ti,max-current-microamp", + 5000); + priv->pwm = ofnode_read_u32_default(child, "ti,pwm-config-mask", 0); + + priv->def_bl_lvl = ofnode_read_u32_default(child, "default-brightness", + LM3533_BL_MAX_BRIGHTNESS); + + priv->linear = ofnode_read_bool(child, "ti,linear-mapping-mode"); + priv->hvled = ofnode_read_bool(child, "ti,hardware-controlled"); + } + } + + return 0; +} + static int lm3533_backlight_probe(struct udevice *dev) { struct lm3533_backlight_priv *priv = dev_get_priv(dev); @@ -100,15 +174,22 @@ static int lm3533_backlight_probe(struct udevice *dev) if (device_get_uclass_id(dev->parent) != UCLASS_I2C) return -EPROTONOSUPPORT; - ret = gpio_request_by_name(dev, "enable-gpios", 0, - &priv->enable_gpio, GPIOD_IS_OUT); + dm_gpio_set_value(&priv->enable_gpio, 1); + mdelay(5); + + ret = dm_i2c_reg_clrset(dev, LM3533_OVP_FREQUENCY_PWM_POLARITY, + BOOST_FREQ_MASK, priv->boost_freq << BOOST_FREQ_SHIFT); if (ret) { - log_err("Could not decode enable-gpios (%d)\n", ret); + log_debug("%s: freq config failed %d\n", __func__, ret); return ret; } - priv->def_bl_lvl = dev_read_u32_default(dev, "default-brightness-level", - LM3533_BL_MAX_BRIGHTNESS); + ret = dm_i2c_reg_clrset(dev, LM3533_OVP_FREQUENCY_PWM_POLARITY, + BOOST_OVP_MASK, priv->boost_ovp << BOOST_OVP_SHIFT); + if (ret) { + log_debug("%s: ovp config failed %d\n", __func__, ret); + return ret; + } return 0; } @@ -127,6 +208,7 @@ U_BOOT_DRIVER(lm3533_backlight) = { .name = "lm3533_backlight", .id = UCLASS_PANEL_BACKLIGHT, .of_match = lm3533_backlight_ids, + .of_to_plat = lm3533_backlight_of_to_plat, .probe = lm3533_backlight_probe, .ops = &lm3533_backlight_ops, .priv_auto = sizeof(struct lm3533_backlight_priv), |