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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2019-04-23 11:04:49 +0200
committerLee Jones <lee.jones@linaro.org>2019-05-08 12:07:02 +0100
commit5be102eb161a0c17b64cf104ccef48ffc9d3e361 (patch)
tree6f18f5d91153745203ca507e677e416f9ae22868 /drivers/leds/leds-max77650.c
parent72b5135bc396ba092268a0970bc3205292bffa67 (diff)
leds: max77650: Add LEDs support
This adds basic support for LEDs for the max77650 PMIC. The device has three current sinks for driving LEDs. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/leds/leds-max77650.c')
-rw-r--r--drivers/leds/leds-max77650.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/leds/leds-max77650.c b/drivers/leds/leds-max77650.c
new file mode 100644
index 000000000000..6b74ce9cac12
--- /dev/null
+++ b/drivers/leds/leds-max77650.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 BayLibre SAS
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+//
+// LED driver for MAXIM 77650/77651 charger/power-supply.
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/mfd/max77650.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define MAX77650_LED_NUM_LEDS 3
+
+#define MAX77650_LED_A_BASE 0x40
+#define MAX77650_LED_B_BASE 0x43
+
+#define MAX77650_LED_BR_MASK GENMASK(4, 0)
+#define MAX77650_LED_EN_MASK GENMASK(7, 6)
+
+#define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK
+
+/* Enable EN_LED_MSTR. */
+#define MAX77650_LED_TOP_DEFAULT BIT(0)
+
+#define MAX77650_LED_ENABLE GENMASK(7, 6)
+#define MAX77650_LED_DISABLE 0x00
+
+#define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE
+/* 100% on duty */
+#define MAX77650_LED_B_DEFAULT GENMASK(3, 0)
+
+struct max77650_led {
+ struct led_classdev cdev;
+ struct regmap *map;
+ unsigned int regA;
+ unsigned int regB;
+};
+
+static struct max77650_led *max77650_to_led(struct led_classdev *cdev)
+{
+ return container_of(cdev, struct max77650_led, cdev);
+}
+
+static int max77650_led_brightness_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct max77650_led *led = max77650_to_led(cdev);
+ int val, mask;
+
+ mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK;
+
+ if (brightness == LED_OFF)
+ val = MAX77650_LED_DISABLE;
+ else
+ val = MAX77650_LED_ENABLE | brightness;
+
+ return regmap_update_bits(led->map, led->regA, mask, val);
+}
+
+static int max77650_led_probe(struct platform_device *pdev)
+{
+ struct device_node *of_node, *child;
+ struct max77650_led *leds, *led;
+ struct device *parent;
+ struct device *dev;
+ struct regmap *map;
+ const char *label;
+ int rv, num_leds;
+ u32 reg;
+
+ dev = &pdev->dev;
+ parent = dev->parent;
+ of_node = dev->of_node;
+
+ if (!of_node)
+ return -ENODEV;
+
+ leds = devm_kcalloc(dev, sizeof(*leds),
+ MAX77650_LED_NUM_LEDS, GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ map = dev_get_regmap(dev->parent, NULL);
+ if (!map)
+ return -ENODEV;
+
+ num_leds = of_get_child_count(of_node);
+ if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS)
+ return -ENODEV;
+
+ for_each_child_of_node(of_node, child) {
+ rv = of_property_read_u32(child, "reg", &reg);
+ if (rv || reg >= MAX77650_LED_NUM_LEDS)
+ return -EINVAL;
+
+ led = &leds[reg];
+ led->map = map;
+ led->regA = MAX77650_LED_A_BASE + reg;
+ led->regB = MAX77650_LED_B_BASE + reg;
+ led->cdev.brightness_set_blocking = max77650_led_brightness_set;
+ led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS;
+
+ label = of_get_property(child, "label", NULL);
+ if (!label) {
+ led->cdev.name = "max77650::";
+ } else {
+ led->cdev.name = devm_kasprintf(dev, GFP_KERNEL,
+ "max77650:%s", label);
+ if (!led->cdev.name)
+ return -ENOMEM;
+ }
+
+ of_property_read_string(child, "linux,default-trigger",
+ &led->cdev.default_trigger);
+
+ rv = devm_of_led_classdev_register(dev, child, &led->cdev);
+ if (rv)
+ return rv;
+
+ rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
+ if (rv)
+ return rv;
+
+ rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
+ if (rv)
+ return rv;
+ }
+
+ return regmap_write(map,
+ MAX77650_REG_CNFG_LED_TOP,
+ MAX77650_LED_TOP_DEFAULT);
+}
+
+static struct platform_driver max77650_led_driver = {
+ .driver = {
+ .name = "max77650-led",
+ },
+ .probe = max77650_led_probe,
+};
+module_platform_driver(max77650_led_driver);
+
+MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL v2");