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Diffstat (limited to 'drivers/leds/leds-tlc591xx.c')
-rw-r--r--drivers/leds/leds-tlc591xx.c240
1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
new file mode 100644
index 0000000000..945e831ef4
--- /dev/null
+++ b/drivers/leds/leds-tlc591xx.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2014 Belkin Inc.
+ * Copyright 2015 Andrew Lunn <andrew@lunn.ch>
+ */
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define TLC591XX_MAX_LEDS 16
+#define TLC591XX_MAX_BRIGHTNESS 256
+
+#define TLC591XX_REG_MODE1 0x00
+#define MODE1_RESPON_ADDR_MASK 0xF0
+#define MODE1_NORMAL_MODE (0 << 4)
+#define MODE1_SPEED_MODE (1 << 4)
+
+#define TLC591XX_REG_MODE2 0x01
+#define MODE2_DIM (0 << 5)
+#define MODE2_BLINK (1 << 5)
+#define MODE2_OCH_STOP (0 << 3)
+#define MODE2_OCH_ACK (1 << 3)
+
+#define TLC591XX_REG_PWM(x) (0x02 + (x))
+
+#define TLC591XX_REG_GRPPWM 0x12
+#define TLC591XX_REG_GRPFREQ 0x13
+
+/* LED Driver Output State, determine the source that drives LED outputs */
+#define LEDOUT_OFF 0x0 /* Output LOW */
+#define LEDOUT_ON 0x1 /* Output HI-Z */
+#define LEDOUT_DIM 0x2 /* Dimming */
+#define LEDOUT_BLINK 0x3 /* Blinking */
+#define LEDOUT_MASK 0x3
+
+#define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev)
+
+struct tlc591xx_led {
+ bool active;
+ unsigned int led_no;
+ struct led_classdev ldev;
+ struct tlc591xx_priv *priv;
+};
+
+struct tlc591xx_priv {
+ struct tlc591xx_led leds[TLC591XX_MAX_LEDS];
+ struct regmap *regmap;
+ unsigned int reg_ledout_offset;
+};
+
+struct tlc591xx {
+ unsigned int max_leds;
+ unsigned int reg_ledout_offset;
+};
+
+static const struct tlc591xx tlc59116 = {
+ .max_leds = 16,
+ .reg_ledout_offset = 0x14,
+};
+
+static const struct tlc591xx tlc59108 = {
+ .max_leds = 8,
+ .reg_ledout_offset = 0x0c,
+};
+
+static int
+tlc591xx_set_mode(struct regmap *regmap, u8 mode)
+{
+ int err;
+ u8 val;
+
+ err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE);
+ if (err)
+ return err;
+
+ val = MODE2_OCH_STOP | mode;
+
+ return regmap_write(regmap, TLC591XX_REG_MODE2, val);
+}
+
+static int
+tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
+ u8 val)
+{
+ unsigned int i = (led->led_no % 4) * 2;
+ unsigned int mask = LEDOUT_MASK << i;
+ unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2);
+
+ val = val << i;
+
+ return regmap_update_bits(priv->regmap, addr, mask, val);
+}
+
+static int
+tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
+ u8 brightness)
+{
+ u8 pwm = TLC591XX_REG_PWM(led->led_no);
+
+ return regmap_write(priv->regmap, pwm, brightness);
+}
+
+static int
+tlc591xx_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct tlc591xx_led *led = ldev_to_led(led_cdev);
+ struct tlc591xx_priv *priv = led->priv;
+ int err;
+
+ switch ((int)brightness) {
+ case 0:
+ err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
+ break;
+ case TLC591XX_MAX_BRIGHTNESS:
+ err = tlc591xx_set_ledout(priv, led, LEDOUT_ON);
+ break;
+ default:
+ err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM);
+ if (!err)
+ err = tlc591xx_set_pwm(priv, led, brightness);
+ }
+
+ return err;
+}
+
+static const struct regmap_config tlc591xx_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x1e,
+};
+
+static const struct of_device_id of_tlc591xx_leds_match[] __maybe_unused = {
+ { .compatible = "ti,tlc59116",
+ .data = &tlc59116 },
+ { .compatible = "ti,tlc59108",
+ .data = &tlc59108 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match);
+
+static int
+tlc591xx_probe(struct i2c_client *client)
+{
+ struct device_node *np, *child;
+ struct device *dev = &client->dev;
+ const struct tlc591xx *tlc591xx;
+ struct tlc591xx_priv *priv;
+ int err, count, reg;
+
+ np = dev_of_node(dev);
+ if (!np)
+ return -ENODEV;
+
+ tlc591xx = device_get_match_data(dev);
+ if (!tlc591xx)
+ return -ENODEV;
+
+ count = of_get_available_child_count(np);
+ if (!count || count > tlc591xx->max_leds)
+ return -EINVAL;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap);
+ if (IS_ERR(priv->regmap)) {
+ err = PTR_ERR(priv->regmap);
+ dev_err(dev, "Failed to allocate register map: %d\n", err);
+ return err;
+ }
+ priv->reg_ledout_offset = tlc591xx->reg_ledout_offset;
+
+ i2c_set_clientdata(client, priv);
+
+ err = tlc591xx_set_mode(priv->regmap, MODE2_DIM);
+ if (err < 0)
+ return err;
+
+ for_each_available_child_of_node(np, child) {
+ struct tlc591xx_led *led;
+ struct led_init_data init_data = {};
+
+ init_data.fwnode = of_fwnode_handle(child);
+
+ err = of_property_read_u32(child, "reg", &reg);
+ if (err) {
+ of_node_put(child);
+ return err;
+ }
+ if (reg < 0 || reg >= tlc591xx->max_leds ||
+ priv->leds[reg].active) {
+ of_node_put(child);
+ return -EINVAL;
+ }
+ led = &priv->leds[reg];
+
+ led->active = true;
+ led->priv = priv;
+ led->led_no = reg;
+ led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
+ led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS;
+ err = devm_led_classdev_register_ext(dev, &led->ldev,
+ &init_data);
+ if (err < 0) {
+ of_node_put(child);
+ return dev_err_probe(dev, err,
+ "couldn't register LED %s\n",
+ led->ldev.name);
+ }
+ }
+ return 0;
+}
+
+static const struct i2c_device_id tlc591xx_id[] = {
+ { "tlc59116" },
+ { "tlc59108" },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, tlc591xx_id);
+
+static struct i2c_driver tlc591xx_driver = {
+ .driver = {
+ .name = "tlc591xx",
+ .of_match_table = of_match_ptr(of_tlc591xx_leds_match),
+ },
+ .probe = tlc591xx_probe,
+ .id_table = tlc591xx_id,
+};
+
+module_i2c_driver(tlc591xx_driver);
+
+MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("TLC591XX LED driver");