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298 lines
7.6 KiB
Diff
298 lines
7.6 KiB
Diff
The TLC59116 is an I2C bus controlled 16-channel LED driver. Each LED
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output has its own 8-bit fixed-frequency PWM controller to control the
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brightness of the LED.
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This is based on a driver from Belkin, but has been extensively
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rewritten.
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Signed-off-by: Andrew Lunn <andrew@lunn.ch>
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---
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drivers/leds/Kconfig | 8 ++
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drivers/leds/Makefile | 1 +
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drivers/leds/leds-tlc59116.c | 252 +++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 261 insertions(+)
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create mode 100644 drivers/leds/leds-tlc59116.c
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--- a/drivers/leds/Kconfig
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+++ b/drivers/leds/Kconfig
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@@ -467,6 +467,14 @@ config LEDS_TCA6507
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LED driver chips accessed via the I2C bus.
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Driver support brightness control and hardware-assisted blinking.
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+config LEDS_TLC59116
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+ tristate "LED driver for TLC59116F controllers"
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+ depends on LEDS_CLASS && I2C
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+ select REGMAP_I2C
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+ help
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+ This option enables support for Texas Instruments TLC59116F
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+ LED controller.
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+
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config LEDS_MAX8997
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tristate "LED support for MAX8997 PMIC"
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depends on LEDS_CLASS && MFD_MAX8997
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--- a/drivers/leds/Makefile
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+++ b/drivers/leds/Makefile
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@@ -31,6 +31,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp850
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obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
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obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
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obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
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+obj-$(CONFIG_LEDS_TLC59116) += leds-tlc59116.o
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obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
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obj-$(CONFIG_LEDS_IPAQ_MICRO) += leds-ipaq-micro.o
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obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
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--- /dev/null
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+++ b/drivers/leds/leds-tlc59116.c
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@@ -0,0 +1,252 @@
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+/*
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+ * Copyright 2014 Belkin Inc.
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+ * Copyright 2014 Andrew Lunn <andrew@lunn.ch>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; version 2 of the License.
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+ */
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+
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+#include <linux/i2c.h>
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+#include <linux/leds.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/regmap.h>
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+#include <linux/slab.h>
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+#include <linux/workqueue.h>
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+
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+#define TLC59116_LEDS 16
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+
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+#define TLC59116_REG_MODE1 0x00
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+#define MODE1_RESPON_ADDR_MASK 0xF0
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+#define MODE1_NORMAL_MODE (0 << 4)
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+#define MODE1_SPEED_MODE (1 << 4)
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+
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+#define TLC59116_REG_MODE2 0x01
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+#define MODE2_DIM (0 << 5)
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+#define MODE2_BLINK (1 << 5)
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+#define MODE2_OCH_STOP (0 << 3)
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+#define MODE2_OCH_ACK (1 << 3)
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+
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+#define TLC59116_REG_PWM(x) (0x02 + (x))
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+
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+#define TLC59116_REG_GRPPWM 0x12
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+#define TLC59116_REG_GRPFREQ 0x13
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+
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+/* LED Driver Output State, determine the source that drives LED outputs */
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+#define TLC59116_REG_LEDOUT(x) (0x14 + ((x) >> 2))
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+#define TLC59116_LED_OFF 0x0 /* Output LOW */
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+#define TLC59116_LED_ON 0x1 /* Output HI-Z */
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+#define TLC59116_DIM 0x2 /* Dimming */
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+#define TLC59116_BLINK 0x3 /* Blinking */
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+#define LED_MASK 0x3
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+
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+#define ldev_to_led(c) container_of(c, struct tlc59116_led, ldev)
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+#define work_to_led(work) container_of(work, struct tlc59116_led, work)
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+
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+struct tlc59116_led {
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+ bool active;
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+ struct regmap *regmap;
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+ unsigned int led_no;
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+ struct led_classdev ldev;
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+ struct work_struct work;
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+};
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+
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+struct tlc59116_priv {
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+ struct tlc59116_led leds[TLC59116_LEDS];
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+};
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+
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+static int
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+tlc59116_set_mode(struct regmap *regmap, u8 mode)
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+{
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+ int err;
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+ u8 val;
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+
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+ if ((mode != MODE2_DIM) && (mode != MODE2_BLINK))
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+ mode = MODE2_DIM;
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+
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+ /* Configure MODE1 register */
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+ err = regmap_write(regmap, TLC59116_REG_MODE1, MODE1_NORMAL_MODE);
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+ if (err)
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+ return err;
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+
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+ /* Configure MODE2 Reg */
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+ val = MODE2_OCH_STOP | mode;
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+
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+ return regmap_write(regmap, TLC59116_REG_MODE2, val);
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+}
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+
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+static int
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+tlc59116_set_led(struct tlc59116_led *led, u8 val)
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+{
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+ struct regmap *regmap = led->regmap;
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+ unsigned int i = (led->led_no % 4) * 2;
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+ unsigned int addr = TLC59116_REG_LEDOUT(led->led_no);
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+ unsigned int mask = LED_MASK << i;
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+
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+ val = val << i;
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+
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+ return regmap_update_bits(regmap, addr, mask, val);
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+}
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+
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+static void
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+tlc59116_led_work(struct work_struct *work)
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+{
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+ struct tlc59116_led *led = work_to_led(work);
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+ struct regmap *regmap = led->regmap;
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+ int err;
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+ u8 pwm;
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+
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+ pwm = TLC59116_REG_PWM(led->led_no);
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+ err = regmap_write(regmap, pwm, led->ldev.brightness);
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+ if (err)
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+ dev_err(led->ldev.dev, "Failed setting brightness\n");
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+}
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+
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+static void
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+tlc59116_led_set(struct led_classdev *led_cdev, enum led_brightness value)
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+{
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+ struct tlc59116_led *led = ldev_to_led(led_cdev);
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+
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+ led->ldev.brightness = value;
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+ schedule_work(&led->work);
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+}
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+
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+static void
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+tlc59116_destroy_devices(struct tlc59116_priv *priv, unsigned int i)
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+{
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+ while (--i >= 0) {
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+ if (priv->leds[i].active) {
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+ led_classdev_unregister(&priv->leds[i].ldev);
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+ cancel_work_sync(&priv->leds[i].work);
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+ }
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+ }
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+}
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+
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+static int
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+tlc59116_configure(struct device *dev,
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+ struct tlc59116_priv *priv,
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+ struct regmap *regmap)
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+{
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+ unsigned int i;
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+ int err = 0;
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+
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+ tlc59116_set_mode(regmap, MODE2_DIM);
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+ for (i = 0; i < TLC59116_LEDS; i++) {
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+ struct tlc59116_led *led = &priv->leds[i];
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+
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+ if (!led->active)
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+ continue;
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+
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+ led->regmap = regmap;
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+ led->led_no = i;
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+ led->ldev.brightness_set = tlc59116_led_set;
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+ led->ldev.max_brightness = LED_FULL;
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+ INIT_WORK(&led->work, tlc59116_led_work);
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+ err = led_classdev_register(dev, &led->ldev);
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+ if (err < 0) {
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+ dev_err(dev, "couldn't register LED %s\n",
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+ led->ldev.name);
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+ goto exit;
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+ }
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+ tlc59116_set_led(led, TLC59116_DIM);
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+ }
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+
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+ return 0;
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+
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+exit:
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+ tlc59116_destroy_devices(priv, i);
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+ return err;
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+}
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+
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+static const struct regmap_config tlc59116_regmap = {
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+ .reg_bits = 8,
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+ .val_bits = 8,
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+ .max_register = 0x1e,
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+};
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+
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+static int
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+tlc59116_probe(struct i2c_client *client,
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+ const struct i2c_device_id *id)
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+{
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+ struct tlc59116_priv *priv = i2c_get_clientdata(client);
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+ struct device *dev = &client->dev;
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+ struct device_node *np = client->dev.of_node, *child;
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+ struct regmap *regmap;
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+ int err, count, reg;
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+
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+ count = of_get_child_count(np);
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+ if (!count || count > TLC59116_LEDS)
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+ return -EINVAL;
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+
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+ if (!i2c_check_functionality(client->adapter,
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+ I2C_FUNC_SMBUS_BYTE_DATA))
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+ return -EIO;
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+
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+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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+ if (!priv)
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+ return -ENOMEM;
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+
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+ regmap = devm_regmap_init_i2c(client, &tlc59116_regmap);
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+ if (IS_ERR(regmap)) {
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+ err = PTR_ERR(regmap);
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+ dev_err(dev, "Failed to allocate register map: %d\n", err);
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+ return err;
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+ }
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+
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+ i2c_set_clientdata(client, priv);
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+
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+ for_each_child_of_node(np, child) {
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+ err = of_property_read_u32(child, "reg", ®);
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+ if (err)
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+ return err;
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+ if (reg < 0 || reg >= TLC59116_LEDS)
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+ return -EINVAL;
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+ if (priv->leds[reg].active)
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+ return -EINVAL;
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+ priv->leds[reg].active = true;
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+ priv->leds[reg].ldev.name =
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+ of_get_property(child, "label", NULL) ? : child->name;
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+ priv->leds[reg].ldev.default_trigger =
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+ of_get_property(child, "linux,default-trigger", NULL);
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+ }
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+ return tlc59116_configure(dev, priv, regmap);
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+}
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+
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+static int
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+tlc59116_remove(struct i2c_client *client)
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+{
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+ struct tlc59116_priv *priv = i2c_get_clientdata(client);
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+
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+ tlc59116_destroy_devices(priv, TLC59116_LEDS);
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id of_tlc59116_leds_match[] = {
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+ { .compatible = "ti,tlc59116", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, of_tlc59116_leds_match);
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+
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+static const struct i2c_device_id tlc59116_id[] = {
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+ { "tlc59116" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(i2c, tlc59116_id);
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+
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+static struct i2c_driver tlc59116_driver = {
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+ .driver = {
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+ .name = "tlc59116",
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+ .of_match_table = of_match_ptr(of_tlc59116_leds_match),
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+ },
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+ .probe = tlc59116_probe,
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+ .remove = tlc59116_remove,
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+ .id_table = tlc59116_id,
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+};
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+
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+module_i2c_driver(tlc59116_driver);
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+
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+MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION("TLC59116 LED driver");
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