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leds: Added driver for the NXP PCA9685 I2C chip
The NXP PCA9685 supports 16 channels/leds using a 12-bit PWM (4095 levels of brightness) This driver supports configuration using platform_data. Signed-off-by: Maximilian Güntner <maximilian.guentner@gmail.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Maximilian Güntner
Bryan Wu
parent
1e08f72dd2
commit
bb6febdc90
@ -300,6 +300,16 @@ config LEDS_PCA963X
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LED driver chip accessed via the I2C bus. Supported
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devices include PCA9633 and PCA9634
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config LEDS_PCA9685
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tristate "LED support for PCA9685 I2C chip"
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depends on LEDS_CLASS
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depends on I2C
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help
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This option enables support for LEDs connected to the PCA9685
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LED driver chip accessed via the I2C bus.
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The PCA9685 offers 12-bit PWM (4095 levels of brightness) on
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16 individual channels.
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config LEDS_WM831X_STATUS
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tristate "LED support for status LEDs on WM831x PMICs"
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depends on LEDS_CLASS
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@ -36,6 +36,7 @@ obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
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obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
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obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
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obj-$(CONFIG_LEDS_PCA963X) += leds-pca963x.o
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obj-$(CONFIG_LEDS_PCA9685) += leds-pca9685.o
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obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o
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obj-$(CONFIG_LEDS_DA9052) += leds-da9052.o
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obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
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213
drivers/leds/leds-pca9685.c
Normal file
213
drivers/leds/leds-pca9685.c
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@ -0,0 +1,213 @@
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/*
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* Copyright 2013 Maximilian Güntner <maximilian.guentner@gmail.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* Based on leds-pca963x.c driver by
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* Peter Meerwald <p.meerwald@bct-electronic.com>
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*
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* Driver for the NXP PCA9685 12-Bit PWM LED driver chip.
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*
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*/
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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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/slab.h>
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#include <linux/string.h>
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#include <linux/workqueue.h>
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#include <linux/platform_data/leds-pca9685.h>
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/* Register Addresses */
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#define PCA9685_MODE1 0x00
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#define PCA9685_MODE2 0x01
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#define PCA9685_LED0_ON_L 0x06
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#define PCA9685_ALL_LED_ON_L 0xFA
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/* MODE1 Register */
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#define PCA9685_ALLCALL 0x00
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#define PCA9685_SLEEP 0x04
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#define PCA9685_AI 0x05
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/* MODE2 Register */
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#define PCA9685_INVRT 0x04
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#define PCA9685_OUTDRV 0x02
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static const struct i2c_device_id pca9685_id[] = {
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{ "pca9685", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca9685_id);
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struct pca9685_led {
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struct i2c_client *client;
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struct work_struct work;
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u16 brightness;
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struct led_classdev led_cdev;
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int led_num; /* 0-15 */
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char name[32];
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};
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static void pca9685_write_msg(struct i2c_client *client, u8 *buf, u8 len)
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{
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struct i2c_msg msg = {
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.addr = client->addr,
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.flags = 0x00,
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.len = len,
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.buf = buf
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};
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i2c_transfer(client->adapter, &msg, 1);
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}
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static void pca9685_all_off(struct i2c_client *client)
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{
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u8 i2c_buffer[5] = {PCA9685_ALL_LED_ON_L, 0x00, 0x00, 0x00, 0x10};
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pca9685_write_msg(client, i2c_buffer, 5);
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}
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static void pca9685_led_work(struct work_struct *work)
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{
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struct pca9685_led *pca9685;
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u8 i2c_buffer[5];
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pca9685 = container_of(work, struct pca9685_led, work);
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i2c_buffer[0] = PCA9685_LED0_ON_L + 4 * pca9685->led_num;
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/*
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* 4095 is the maximum brightness, so we set the ON time to 0x1000
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* which disables the PWM generator for that LED
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*/
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if (pca9685->brightness == 4095)
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*((__le16 *)(i2c_buffer+1)) = cpu_to_le16(0x1000);
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else
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*((__le16 *)(i2c_buffer+1)) = 0x0000;
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if (pca9685->brightness == 0)
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*((__le16 *)(i2c_buffer+3)) = cpu_to_le16(0x1000);
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else if (pca9685->brightness == 4095)
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*((__le16 *)(i2c_buffer+3)) = 0x0000;
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else
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*((__le16 *)(i2c_buffer+3)) = cpu_to_le16(pca9685->brightness);
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pca9685_write_msg(pca9685->client, i2c_buffer, 5);
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}
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static void pca9685_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct pca9685_led *pca9685;
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pca9685 = container_of(led_cdev, struct pca9685_led, led_cdev);
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pca9685->brightness = value;
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schedule_work(&pca9685->work);
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}
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static int pca9685_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pca9685_led *pca9685;
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struct pca9685_platform_data *pdata;
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int err;
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u8 i;
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pdata = dev_get_platdata(&client->dev);
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if (pdata) {
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if (pdata->leds.num_leds < 1 || pdata->leds.num_leds > 15) {
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dev_err(&client->dev, "board info must claim 1-16 LEDs");
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return -EINVAL;
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}
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}
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pca9685 = devm_kzalloc(&client->dev, 16 * sizeof(*pca9685), GFP_KERNEL);
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if (!pca9685)
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return -ENOMEM;
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i2c_set_clientdata(client, pca9685);
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pca9685_all_off(client);
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for (i = 0; i < 16; i++) {
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pca9685[i].client = client;
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pca9685[i].led_num = i;
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pca9685[i].name[0] = '\0';
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if (pdata && i < pdata->leds.num_leds) {
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if (pdata->leds.leds[i].name)
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strncpy(pca9685[i].name,
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pdata->leds.leds[i].name,
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sizeof(pca9685[i].name)-1);
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if (pdata->leds.leds[i].default_trigger)
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pca9685[i].led_cdev.default_trigger =
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pdata->leds.leds[i].default_trigger;
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}
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if (strlen(pca9685[i].name) == 0) {
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/*
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* Write adapter and address to the name as well.
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* Otherwise multiple chips attached to one host would
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* not work.
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*/
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snprintf(pca9685[i].name, sizeof(pca9685[i].name),
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"pca9685:%d:x%.2x:%d",
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client->adapter->nr, client->addr, i);
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}
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pca9685[i].led_cdev.name = pca9685[i].name;
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pca9685[i].led_cdev.max_brightness = 0xfff;
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pca9685[i].led_cdev.brightness_set = pca9685_led_set;
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INIT_WORK(&pca9685[i].work, pca9685_led_work);
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err = led_classdev_register(&client->dev, &pca9685[i].led_cdev);
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if (err < 0)
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goto exit;
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}
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if (pdata)
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i2c_smbus_write_byte_data(client, PCA9685_MODE2,
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pdata->outdrv << PCA9685_OUTDRV |
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pdata->inverted << PCA9685_INVRT);
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else
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i2c_smbus_write_byte_data(client, PCA9685_MODE2,
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PCA9685_TOTEM_POLE << PCA9685_OUTDRV);
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/* Enable Auto-Increment, enable oscillator, ALLCALL/SUBADDR disabled */
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i2c_smbus_write_byte_data(client, PCA9685_MODE1, BIT(PCA9685_AI));
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return 0;
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exit:
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while (i--) {
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led_classdev_unregister(&pca9685[i].led_cdev);
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cancel_work_sync(&pca9685[i].work);
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}
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return err;
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}
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static int pca9685_remove(struct i2c_client *client)
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{
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struct pca9685_led *pca9685 = i2c_get_clientdata(client);
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u8 i;
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for (i = 0; i < 16; i++) {
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led_classdev_unregister(&pca9685[i].led_cdev);
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cancel_work_sync(&pca9685[i].work);
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}
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pca9685_all_off(client);
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return 0;
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}
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static struct i2c_driver pca9685_driver = {
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.driver = {
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.name = "leds-pca9685",
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.owner = THIS_MODULE,
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},
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.probe = pca9685_probe,
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.remove = pca9685_remove,
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.id_table = pca9685_id,
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};
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module_i2c_driver(pca9685_driver);
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MODULE_AUTHOR("Maximilian Güntner <maximilian.guentner@gmail.com>");
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MODULE_DESCRIPTION("PCA9685 LED Driver");
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MODULE_LICENSE("GPL v2");
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35
include/linux/platform_data/leds-pca9685.h
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35
include/linux/platform_data/leds-pca9685.h
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@ -0,0 +1,35 @@
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/*
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* Copyright 2013 Maximilian Güntner <maximilian.guentner@gmail.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* Based on leds-pca963x.h by Peter Meerwald <p.meerwald@bct-electronic.com>
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*
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* LED driver for the NXP PCA9685 PWM chip
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*
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*/
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#ifndef __LINUX_PCA9685_H
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#define __LINUX_PCA9685_H
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#include <linux/leds.h>
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enum pca9685_outdrv {
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PCA9685_OPEN_DRAIN,
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PCA9685_TOTEM_POLE,
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};
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enum pca9685_inverted {
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PCA9685_NOT_INVERTED,
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PCA9685_INVERTED,
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};
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struct pca9685_platform_data {
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struct led_platform_data leds;
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enum pca9685_outdrv outdrv;
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enum pca9685_inverted inverted;
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};
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#endif /* __LINUX_PCA9685_H */
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