From: Isai Gaspar <isaiezequiel.gaspar@xxxxxxx>
The PCA995x chips are I2C controlled LED drivers. Each chip has
up to 16 outputs, each one with an individual 8-bit resolution
PWM for brightness control.
Signed-off-by: Isai Gaspar <isaiezequiel.gaspar@xxxxxxx>
Signed-off-by: Marek Vasut <marex@xxxxxxx> # Basically rewrite the driver
---
Cc: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: Isai Gaspar <isaiezequiel.gaspar@xxxxxxx>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>
Cc: Lee Jones <lee@xxxxxxxxxx>
Cc: Marek Vasut <marex@xxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-leds@xxxxxxxxxxxxxxx
---
drivers/leds/Kconfig | 9 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-pca995x.c | 198 ++++++++++++++++++++++++++++++++++++
3 files changed, 208 insertions(+)
create mode 100644 drivers/leds/leds-pca995x.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 6046dfeca16fc..b92208eccdea9 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -521,6 +521,15 @@ config LEDS_PCA963X
LED driver chip accessed via the I2C bus. Supported
devices include PCA9633 and PCA9634
+config LEDS_PCA995X
+ tristate "LED Support for PCA995x I2C chips"
+ depends on LEDS_CLASS
+ depends on I2C
+ help
+ This option enables support for LEDs connected to PCA995x
+ LED driver chips accessed via the I2C bus. Supported
+ devices include PCA9955BTW, PCA9952TW and PCA9955TW.
+
config LEDS_WM831X_STATUS
tristate "LED support for status LEDs on WM831x PMICs"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index d71f1226540c2..d7348e8bc019a 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
obj-$(CONFIG_LEDS_PCA963X) += leds-pca963x.o
+obj-$(CONFIG_LEDS_PCA995X) += leds-pca995x.o
obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o
obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o
obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
diff --git a/drivers/leds/leds-pca995x.c b/drivers/leds/leds-pca995x.c
new file mode 100644
index 0000000000000..3fb78ee94d403
--- /dev/null
+++ b/drivers/leds/leds-pca995x.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * LED driver for PCA995x I2C LED drivers
+ *
+ * Copyright 2011 bct electronic GmbH
+ * Copyright 2013 Qtechnology/AS
+ * Copyright 2022 NXP
+ * Copyright 2023 Marek Vasut
+ */
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+/* Register definition */
+#define PCA995X_MODE1 0x00
+#define PCA995X_MODE2 0x01
+#define PCA995X_LEDOUT0 0x02
+#define PCA9955B_PWM0 0x08
+#define PCA9952_PWM0 0x0A
+#define PCA9952_IREFALL 0x43
+#define PCA9955B_IREFALL 0x45
+
+/* LED select registers determine the source that drives LED outputs */
+#define PCA995X_LED_OFF 0x0 /* LED driver off */
+#define PCA995X_LED_ON 0x1 /* LED driver on */
+#define PCA995X_LED_PWM 0x2 /* Controlled through PWM */
+#define PCA995X_LDRX_MASK 0x3 /* 2 bits per output state control */
+
+#define PCA995X_MODE_1_CFG 0x00 /* Auto-increment disabled. Normal mode */
+#define PCA995X_IREFALL_CFG 0x7F /* Half of max current gain multiplier */
+
+#define PCA995X_MAX_OUTPUTS 16 /* Supported outputs */
+
+#define ldev_to_led(c) container_of(c, struct pca995x_led, ldev)
+
+struct pca995x_led {
+ unsigned int led_no;
+ struct led_classdev ldev;
+ struct pca995x_chip *chip;
+};
+
+struct pca995x_chip {
+ struct regmap *regmap;
+ struct pca995x_led leds[PCA995X_MAX_OUTPUTS];
+ int btype;
+};
+
+static int pca995x_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct pca995x_led *led = ldev_to_led(led_cdev);
+ struct pca995x_chip *chip = led->chip;
+ u8 ledout_addr, pwmout_addr;
+ int shift, ret;
+
+ pwmout_addr = (chip->btype ? PCA9955B_PWM0 : PCA9952_PWM0) + led->led_no;
+ ledout_addr = PCA995X_LEDOUT0 + (led->led_no / 4);
+ shift = 2 * (led->led_no % 4);
+
+ switch (brightness) {
+ case LED_FULL:
+ return regmap_update_bits(chip->regmap, ledout_addr,
+ PCA995X_LDRX_MASK << shift,
+ PCA995X_LED_ON << shift);
+ case LED_OFF:
+ return regmap_update_bits(chip->regmap, ledout_addr,
+ PCA995X_LDRX_MASK << shift, 0);
+ default:
+ /* Adjust brightness as per user input by changing individual PWM */
+ ret = regmap_write(chip->regmap, pwmout_addr, brightness);
+ if (ret)
+ return ret;
+
+ /*
+ * Change LDRx configuration to individual brightness via PWM.
+ * Led will stop blinking if it's doing so
+ */
+ return regmap_update_bits(chip->regmap, ledout_addr,
+ PCA995X_LDRX_MASK << shift,
+ PCA995X_LED_PWM << shift);
+ }
+}
+
+static const struct regmap_config pca995x_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x49,
+};
+
+static int pca995x_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct fwnode_handle *led_fwnodes[PCA995X_MAX_OUTPUTS] = { 0 };
+ struct fwnode_handle *np, *child;
+ struct device *dev = &client->dev;
+ struct pca995x_chip *chip;
+ struct pca995x_led *led;
+ int i, btype, reg, ret;
+
+ btype = (int)device_get_match_data(&client->dev);
+
+ np = dev_fwnode(dev);
+ if (!np)
+ return -ENODEV;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->btype = btype;
+ chip->regmap = devm_regmap_init_i2c(client, &pca995x_regmap);
+ if (IS_ERR(chip->regmap))
+ return PTR_ERR(chip->regmap);
+
+ i2c_set_clientdata(client, chip);
+
+ fwnode_for_each_available_child_node(np, child) {
+ ret = fwnode_property_read_u32(child, "reg", ®);
+ if (ret) {
+ fwnode_handle_put(child);
+ return ret;
+ }
+
+ if (reg < 0 || reg >= PCA995X_MAX_OUTPUTS || led_fwnodes[reg]) {
+ fwnode_handle_put(child);
+ return -EINVAL;
+ }
+
+ led = &chip->leds[reg];
+ led_fwnodes[reg] = child;
+ led->chip = chip;
+ led->led_no = reg;
+ led->ldev.brightness_set_blocking = pca995x_brightness_set;
+ led->ldev.max_brightness = 255;
+ }
+
+ for (i = 0; i < PCA995X_MAX_OUTPUTS; i++) {
+ struct led_init_data init_data = {};
+
+ if (!led_fwnodes[i])
+ continue;
+
+ init_data.fwnode = led_fwnodes[i];
+
+ ret = devm_led_classdev_register_ext(dev,
+ &chip->leds[i].ldev,
+ &init_data);
+ if (ret < 0) {
+ fwnode_handle_put(child);
+ return dev_err_probe(dev, ret,
+ "Could not register LED %s\n",
+ chip->leds[i].ldev.name);
+ }
+ }
+
+ /* Disable LED all-call address and set normal mode */
+ ret = regmap_write(chip->regmap, PCA995X_MODE1, PCA995X_MODE_1_CFG);
+ if (ret)
+ return ret;
+
+ /* IREF Output current value for all LEDn outputs */
+ return regmap_write(chip->regmap,
+ btype ? PCA9955B_IREFALL : PCA9952_IREFALL,
+ PCA995X_IREFALL_CFG);
+}
+
+static const struct i2c_device_id pca995x_id[] = {
+ { "pca9952", .driver_data = (kernel_ulong_t)0 /* non-B chip */ },
+ { "pca9955b", .driver_data = (kernel_ulong_t)1 /* B-type chip */ },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, pca995x_id);
+
+static const struct of_device_id pca995x_of_match[] = {
+ { .compatible = "nxp,pca9952", .data = (void *)0 /* non-B chip */ },
+ { .compatible = "nxp,pca9955b", .data = (void *)1 /* B-type chip */ },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, pca995x_of_match);
+
+static struct i2c_driver pca995x_driver = {
+ .driver = {
+ .name = "leds-pca995x",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pca995x_of_match),
+ },
+ .probe = pca995x_probe,
+ .id_table = pca995x_id,
+};
+
+module_i2c_driver(pca995x_driver);
+
+MODULE_AUTHOR("Isai Gaspar <isaiezequiel.gaspar@xxxxxxx>");
+MODULE_DESCRIPTION("PCA995x LED driver");
+MODULE_LICENSE("GPL");
--
2.40.1
