@@ -593,6 +593,16 @@ config LEDS_REGULATOR
help
This option enables support for regulator driven LEDs.
+config LEDS_RTL8231
+ tristate "RTL8231 LED matrix support"
+ depends on LEDS_CLASS
+ depends on MFD_RTL8231
+ default MFD_RTL8231
+ help
+ This option enables support for using the LED scanning matrix output
+ of the RTL8231 GPIO and LED expander chip.
+ When built as a module, this module will be named leds-rtl8231.
+
config LEDS_BD2802
tristate "LED driver for BD2802 RGB LED"
depends on LEDS_CLASS
@@ -80,6 +80,7 @@ obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o
obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o
obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o
+obj-$(CONFIG_LEDS_RTL8231) += leds-rtl8231.o
obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o
new file mode 100644
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/device.h>
+#include <linux/leds.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/rtl8231.h>
+
+/**
+ * struct led_toggle_rate - description of an LED blinking mode
+ * @interval_ms: LED toggle rate in milliseconds
+ * @mode: Register field value used to activate this mode
+ *
+ * For LED hardware accelerated blinking, with equal on and off delay.
+ * Both delays are given by @interval, so the interval at which the LED blinks
+ * (i.e. turn on and off once) is double this value.
+ */
+struct led_toggle_rate {
+ u16 interval_ms;
+ u8 mode;
+};
+
+/**
+ * struct led_modes - description of all LED modes
+ * @toggle_rates: Array of led_toggle_rate values, sorted by ascending interval
+ * @num_toggle_rates: Number of elements in @led_toggle_rate
+ * @off: Register field value to turn LED off
+ * @on: Register field value to turn LED on
+ */
+struct led_modes {
+ const struct led_toggle_rate *toggle_rates;
+ unsigned int num_toggle_rates;
+ u8 off;
+ u8 on;
+};
+
+struct rtl8231_led {
+ struct led_classdev led;
+ const struct led_modes *modes;
+ struct regmap_field *reg_field;
+};
+#define to_rtl8231_led(_cdev) container_of(_cdev, struct rtl8231_led, led)
+
+#define RTL8231_NUM_LEDS 3
+#define RTL8231_LED_PER_REG 5
+#define RTL8231_BITS_PER_LED 3
+
+static const unsigned int rtl8231_led_port_counts_single[RTL8231_NUM_LEDS] = {32, 32, 24};
+static const unsigned int rtl8231_led_port_counts_bicolor[RTL8231_NUM_LEDS] = {24, 24, 24};
+
+static const unsigned int rtl8231_led_base[RTL8231_NUM_LEDS] = {
+ RTL8231_REG_LED0_BASE,
+ RTL8231_REG_LED1_BASE,
+ RTL8231_REG_LED2_BASE,
+};
+
+#define RTL8231_DEFAULT_TOGGLE_INTERVAL_MS 500
+
+static const struct led_toggle_rate rtl8231_toggle_rates[] = {
+ { 40, 1},
+ { 80, 2},
+ { 160, 3},
+ { 320, 4},
+ { 640, 5},
+ {1280, 6},
+};
+
+static const struct led_modes rtl8231_led_modes = {
+ .off = 0,
+ .on = 7,
+ .num_toggle_rates = ARRAY_SIZE(rtl8231_toggle_rates),
+ .toggle_rates = rtl8231_toggle_rates,
+};
+
+static void rtl8231_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct rtl8231_led *pled = to_rtl8231_led(led_cdev);
+
+ if (brightness)
+ regmap_field_write(pled->reg_field, pled->modes->on);
+ else
+ regmap_field_write(pled->reg_field, pled->modes->off);
+}
+
+static enum led_brightness rtl8231_led_brightness_get(struct led_classdev *led_cdev)
+{
+ struct rtl8231_led *pled = to_rtl8231_led(led_cdev);
+ u32 current_mode = pled->modes->off;
+
+ regmap_field_read(pled->reg_field, ¤t_mode);
+
+ if (current_mode == pled->modes->off)
+ return LED_OFF;
+ else
+ return LED_ON;
+}
+
+static unsigned int rtl8231_led_current_interval(struct rtl8231_led *pled)
+{
+ unsigned int mode;
+ unsigned int i;
+
+ if (regmap_field_read(pled->reg_field, &mode))
+ return 0;
+
+ for (i = 0; i < pled->modes->num_toggle_rates; i++)
+ if (mode == pled->modes->toggle_rates[i].mode)
+ return pled->modes->toggle_rates[i].interval_ms;
+
+ return 0;
+}
+
+static int rtl8231_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct rtl8231_led *pled = to_rtl8231_led(led_cdev);
+ const struct led_toggle_rate *rates = pled->modes->toggle_rates;
+ unsigned int num_rates = pled->modes->num_toggle_rates;
+ unsigned int interval_ms;
+ unsigned int i;
+ int err;
+
+ if (*delay_on == 0 && *delay_off == 0) {
+ interval_ms = RTL8231_DEFAULT_TOGGLE_INTERVAL_MS;
+ } else {
+ /*
+ * If the current mode is blinking, choose the delay that (likely) changed.
+ * Otherwise, choose the interval that would have the same total delay.
+ */
+ interval_ms = rtl8231_led_current_interval(pled);
+ if (interval_ms > 0 && interval_ms == *delay_off)
+ interval_ms = *delay_on;
+ else if (interval_ms > 0 && interval_ms == *delay_on)
+ interval_ms = *delay_off;
+ else
+ interval_ms = (*delay_on + *delay_off) / 2;
+ }
+
+ /* Find clamped toggle interval */
+ for (i = 0; i < (num_rates - 1); i++)
+ if (interval_ms > rates[i].interval_ms)
+ break;
+
+ interval_ms = rates[i].interval_ms;
+
+ err = regmap_field_write(pled->reg_field, rates[i].mode);
+ if (err)
+ return err;
+
+ *delay_on = interval_ms;
+ *delay_off = interval_ms;
+
+ return 0;
+}
+
+static int rtl8231_led_read_address(struct fwnode_handle *fwnode, unsigned int *addr_port,
+ unsigned int *addr_led)
+{
+ u32 addr[2];
+ int err;
+
+ err = fwnode_property_count_u32(fwnode, "reg");
+ if (err < 0)
+ return err;
+ if (err != ARRAY_SIZE(addr))
+ return -EINVAL;
+
+ err = fwnode_property_read_u32_array(fwnode, "reg", addr, ARRAY_SIZE(addr));
+ if (err)
+ return err;
+
+ *addr_port = addr[0];
+ *addr_led = addr[1];
+
+ return 0;
+}
+
+static struct reg_field rtl8231_led_get_field(unsigned int port_index, unsigned int led_index)
+{
+ unsigned int offset, shift;
+ struct reg_field field;
+
+ offset = port_index / RTL8231_LED_PER_REG;
+ shift = (port_index % RTL8231_LED_PER_REG) * RTL8231_BITS_PER_LED;
+
+ field.reg = rtl8231_led_base[led_index] + offset;
+ field.lsb = shift;
+ field.msb = shift + RTL8231_BITS_PER_LED - 1;
+
+ return field;
+}
+
+static int rtl8231_led_probe_single(struct device *dev, struct regmap *map,
+ const unsigned int *port_counts, struct fwnode_handle *fwnode)
+{
+ struct led_init_data init_data = {};
+ struct rtl8231_led *pled;
+ unsigned int port_index;
+ unsigned int led_index;
+ struct reg_field field;
+ int err;
+
+ pled = devm_kzalloc(dev, sizeof(*pled), GFP_KERNEL);
+ if (!pled)
+ return -ENOMEM;
+
+ err = rtl8231_led_read_address(fwnode, &port_index, &led_index);
+ if (err) {
+ dev_err(dev, "LED address invalid\n");
+ return err;
+ }
+
+ if (led_index >= RTL8231_NUM_LEDS || port_index >= port_counts[led_index]) {
+ dev_err(dev, "LED address (%d.%d) invalid\n", port_index, led_index);
+ return -EINVAL;
+ }
+
+ field = rtl8231_led_get_field(port_index, led_index);
+ pled->reg_field = devm_regmap_field_alloc(dev, map, field);
+ if (IS_ERR(pled->reg_field))
+ return PTR_ERR(pled->reg_field);
+
+ pled->modes = &rtl8231_led_modes;
+
+ pled->led.max_brightness = 1;
+ pled->led.brightness_get = rtl8231_led_brightness_get;
+ pled->led.brightness_set = rtl8231_led_brightness_set;
+ pled->led.blink_set = rtl8231_led_blink_set;
+
+ init_data.fwnode = fwnode;
+
+ return devm_led_classdev_register_ext(dev, &pled->led, &init_data);
+}
+
+static int rtl8231_led_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const unsigned int *port_counts;
+ struct fwnode_handle *child;
+ struct regmap *map;
+ int err;
+
+ map = dev_get_regmap(dev->parent, NULL);
+ if (!map)
+ return -ENODEV;
+
+ if (device_property_match_string(dev, "realtek,led-scan-mode", "single-color") >= 0) {
+ port_counts = rtl8231_led_port_counts_single;
+ regmap_update_bits(map, RTL8231_REG_FUNC0,
+ RTL8231_FUNC0_SCAN_MODE, RTL8231_FUNC0_SCAN_SINGLE);
+ } else if (device_property_match_string(dev, "realtek,led-scan-mode", "bi-color") >= 0) {
+ port_counts = rtl8231_led_port_counts_bicolor;
+ regmap_update_bits(map, RTL8231_REG_FUNC0,
+ RTL8231_FUNC0_SCAN_MODE, RTL8231_FUNC0_SCAN_BICOLOR);
+ } else {
+ dev_err(dev, "scan mode missing or invalid\n");
+ return -EINVAL;
+ }
+
+ fwnode_for_each_available_child_node(dev->fwnode, child) {
+ err = rtl8231_led_probe_single(dev, map, port_counts, child);
+ if (err)
+ dev_warn(dev, "failed to register LED %pfwP\n", child);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id of_rtl8231_led_match[] = {
+ { .compatible = "realtek,rtl8231-leds" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, of_rtl8231_led_match);
+
+static struct platform_driver rtl8231_led_driver = {
+ .driver = {
+ .name = "rtl8231-leds",
+ .of_match_table = of_rtl8231_led_match,
+ },
+ .probe = rtl8231_led_probe,
+};
+module_platform_driver(rtl8231_led_driver);
+
+MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
+MODULE_DESCRIPTION("Realtek RTL8231 LED support");
+MODULE_LICENSE("GPL v2");