leds: Added driver for the NXP PCA9685 I2C chip (bb6febdc) · Commits · 戴 / test

drivers/leds/Kconfig

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		@@ -300,6 +300,16 @@ config LEDS_PCA963X
		LED driver chip accessed via the I2C bus. Supported
		devices include PCA9633 and PCA9634

		config LEDS_PCA9685
		tristate "LED support for PCA9685 I2C chip"
		depends on LEDS_CLASS
		depends on I2C
		help
		This option enables support for LEDs connected to the PCA9685
		LED driver chip accessed via the I2C bus.
		The PCA9685 offers 12-bit PWM (4095 levels of brightness) on
		16 individual channels.

		config LEDS_WM831X_STATUS
		tristate "LED support for status LEDs on WM831x PMICs"
		depends on LEDS_CLASS

drivers/leds/Makefile

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		@@ -36,6 +36,7 @@ obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
		obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
		obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
		obj-$(CONFIG_LEDS_PCA963X) += leds-pca963x.o
		obj-$(CONFIG_LEDS_PCA9685) += leds-pca9685.o
		obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o
		obj-$(CONFIG_LEDS_DA9052) += leds-da9052.o
		obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o

drivers/leds/leds-pca9685.c

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		/*
		* Copyright 2013 Maximilian Güntner <maximilian.guentner@gmail.com>
		*
		* This file is subject to the terms and conditions of version 2 of
		* the GNU General Public License. See the file COPYING in the main
		* directory of this archive for more details.
		*
		* Based on leds-pca963x.c driver by
		* Peter Meerwald <p.meerwald@bct-electronic.com>
		*
		* Driver for the NXP PCA9685 12-Bit PWM LED driver chip.
		*
		*/

		#include <linux/ctype.h>
		#include <linux/delay.h>
		#include <linux/err.h>
		#include <linux/i2c.h>
		#include <linux/leds.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/string.h>
		#include <linux/workqueue.h>

		#include <linux/platform_data/leds-pca9685.h>

		/* Register Addresses */
		#define PCA9685_MODE1 0x00
		#define PCA9685_MODE2 0x01
		#define PCA9685_LED0_ON_L 0x06
		#define PCA9685_ALL_LED_ON_L 0xFA

		/* MODE1 Register */
		#define PCA9685_ALLCALL 0x00
		#define PCA9685_SLEEP 0x04
		#define PCA9685_AI 0x05

		/* MODE2 Register */
		#define PCA9685_INVRT 0x04
		#define PCA9685_OUTDRV 0x02

		static const struct i2c_device_id pca9685_id[] = {
		{ "pca9685", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, pca9685_id);

		struct pca9685_led {
		struct i2c_client *client;
		struct work_struct work;
		u16 brightness;
		struct led_classdev led_cdev;
		int led_num; /* 0-15 */
		char name[32];
		};

		static void pca9685_write_msg(struct i2c_client client, u8 buf, u8 len)
		{
		struct i2c_msg msg = {
		.addr = client->addr,
		.flags = 0x00,
		.len = len,
		.buf = buf
		};
		i2c_transfer(client->adapter, &msg, 1);
		}

		static void pca9685_all_off(struct i2c_client *client)
		{
		u8 i2c_buffer[5] = {PCA9685_ALL_LED_ON_L, 0x00, 0x00, 0x00, 0x10};
		pca9685_write_msg(client, i2c_buffer, 5);
		}

		static void pca9685_led_work(struct work_struct *work)
		{
		struct pca9685_led *pca9685;
		u8 i2c_buffer[5];

		pca9685 = container_of(work, struct pca9685_led, work);
		i2c_buffer[0] = PCA9685_LED0_ON_L + 4 * pca9685->led_num;
		/*
		* 4095 is the maximum brightness, so we set the ON time to 0x1000
		* which disables the PWM generator for that LED
		*/
		if (pca9685->brightness == 4095)
		((__le16 )(i2c_buffer+1)) = cpu_to_le16(0x1000);
		else
		((__le16 )(i2c_buffer+1)) = 0x0000;

		if (pca9685->brightness == 0)
		((__le16 )(i2c_buffer+3)) = cpu_to_le16(0x1000);
		else if (pca9685->brightness == 4095)
		((__le16 )(i2c_buffer+3)) = 0x0000;
		else
		((__le16 )(i2c_buffer+3)) = cpu_to_le16(pca9685->brightness);

		pca9685_write_msg(pca9685->client, i2c_buffer, 5);
		}

		static void pca9685_led_set(struct led_classdev *led_cdev,
		enum led_brightness value)
		{
		struct pca9685_led *pca9685;
		pca9685 = container_of(led_cdev, struct pca9685_led, led_cdev);
		pca9685->brightness = value;

		schedule_work(&pca9685->work);
		}

		static int pca9685_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct pca9685_led *pca9685;
		struct pca9685_platform_data *pdata;
		int err;
		u8 i;

		pdata = dev_get_platdata(&client->dev);
		if (pdata) {
		if (pdata->leds.num_leds < 1 \|\| pdata->leds.num_leds > 15) {
		dev_err(&client->dev, "board info must claim 1-16 LEDs");
		return -EINVAL;
		}
		}

		pca9685 = devm_kzalloc(&client->dev, 16 * sizeof(*pca9685), GFP_KERNEL);
		if (!pca9685)
		return -ENOMEM;

		i2c_set_clientdata(client, pca9685);
		pca9685_all_off(client);

		for (i = 0; i < 16; i++) {
		pca9685[i].client = client;
		pca9685[i].led_num = i;
		pca9685[i].name[0] = '\0';
		if (pdata && i < pdata->leds.num_leds) {
		if (pdata->leds.leds[i].name)
		strncpy(pca9685[i].name,
		pdata->leds.leds[i].name,
		sizeof(pca9685[i].name)-1);
		if (pdata->leds.leds[i].default_trigger)
		pca9685[i].led_cdev.default_trigger =
		pdata->leds.leds[i].default_trigger;
		}
		if (strlen(pca9685[i].name) == 0) {
		/*
		* Write adapter and address to the name as well.
		* Otherwise multiple chips attached to one host would
		* not work.
		*/
		snprintf(pca9685[i].name, sizeof(pca9685[i].name),
		"pca9685:%d:x%.2x:%d",
		client->adapter->nr, client->addr, i);
		}
		pca9685[i].led_cdev.name = pca9685[i].name;
		pca9685[i].led_cdev.max_brightness = 0xfff;
		pca9685[i].led_cdev.brightness_set = pca9685_led_set;

		INIT_WORK(&pca9685[i].work, pca9685_led_work);
		err = led_classdev_register(&client->dev, &pca9685[i].led_cdev);
		if (err < 0)
		goto exit;
		}

		if (pdata)
		i2c_smbus_write_byte_data(client, PCA9685_MODE2,
		pdata->outdrv << PCA9685_OUTDRV \|
		pdata->inverted << PCA9685_INVRT);
		else
		i2c_smbus_write_byte_data(client, PCA9685_MODE2,
		PCA9685_TOTEM_POLE << PCA9685_OUTDRV);
		/* Enable Auto-Increment, enable oscillator, ALLCALL/SUBADDR disabled */
		i2c_smbus_write_byte_data(client, PCA9685_MODE1, BIT(PCA9685_AI));

		return 0;

		exit:
		while (i--) {
		led_classdev_unregister(&pca9685[i].led_cdev);
		cancel_work_sync(&pca9685[i].work);
		}
		return err;
		}

		static int pca9685_remove(struct i2c_client *client)
		{
		struct pca9685_led *pca9685 = i2c_get_clientdata(client);
		u8 i;

		for (i = 0; i < 16; i++) {
		led_classdev_unregister(&pca9685[i].led_cdev);
		cancel_work_sync(&pca9685[i].work);
		}
		pca9685_all_off(client);
		return 0;
		}

		static struct i2c_driver pca9685_driver = {
		.driver = {
		.name = "leds-pca9685",
		.owner = THIS_MODULE,
		},
		.probe = pca9685_probe,
		.remove = pca9685_remove,
		.id_table = pca9685_id,
		};

		module_i2c_driver(pca9685_driver);

		MODULE_AUTHOR("Maximilian Güntner <maximilian.guentner@gmail.com>");
		MODULE_DESCRIPTION("PCA9685 LED Driver");
		MODULE_LICENSE("GPL v2");

include/linux/platform_data/leds-pca9685.h

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		/*
		* Copyright 2013 Maximilian Güntner <maximilian.guentner@gmail.com>
		*
		* This file is subject to the terms and conditions of version 2 of
		* the GNU General Public License. See the file COPYING in the main
		* directory of this archive for more details.
		*
		* Based on leds-pca963x.h by Peter Meerwald <p.meerwald@bct-electronic.com>
		*
		* LED driver for the NXP PCA9685 PWM chip
		*
		*/

		#ifndef __LINUX_PCA9685_H
		#define __LINUX_PCA9685_H

		#include <linux/leds.h>

		enum pca9685_outdrv {
		PCA9685_OPEN_DRAIN,
		PCA9685_TOTEM_POLE,
		};

		enum pca9685_inverted {
		PCA9685_NOT_INVERTED,
		PCA9685_INVERTED,
		};

		struct pca9685_platform_data {
		struct led_platform_data leds;
		enum pca9685_outdrv outdrv;
		enum pca9685_inverted inverted;
		};

		#endif /* __LINUX_PCA9685_H */

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