drivers/leds: add driver for PCA9633 I2C chip
Driver for the PCA9633 I2C chip supporting four LEDs and 255 brightness levels. [akpm@linux-foundation.org: fix kcalloc() call] [axel.lin@gmail.com: fix kcalloc parameters swapped] Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com> Signed-off-by: Axel Lin <axel.lin@gmail.com> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Meerwald
Linus Torvalds
parent
d06cb46c3e
commit
75cb2e1d1a
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@ -234,6 +234,14 @@ config LEDS_PCA955X
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LED driver chips accessed via the I2C bus. Supported
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devices include PCA9550, PCA9551, PCA9552, and PCA9553.
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config LEDS_PCA9633
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tristate "LED support for PCA9633 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 PCA9633
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LED driver chip accessed via the I2C bus.
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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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@ -30,6 +30,7 @@ obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
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obj-$(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-$(CONFIG_LEDS_PCA9633) += leds-pca9633.o
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obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o
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obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
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obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
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@ -0,0 +1,195 @@
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/*
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* Copyright 2011 bct electronic GmbH
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*
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* Author: Peter Meerwald <p.meerwald@bct-electronic.com>
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*
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* Based on leds-pca955x.c
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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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* LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62)
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*
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/leds.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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/* LED select registers determine the source that drives LED outputs */
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#define PCA9633_LED_OFF 0x0 /* LED driver off */
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#define PCA9633_LED_ON 0x1 /* LED driver on */
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#define PCA9633_LED_PWM 0x2 /* Controlled through PWM */
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#define PCA9633_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */
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#define PCA9633_MODE1 0x00
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#define PCA9633_MODE2 0x01
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#define PCA9633_PWM_BASE 0x02
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#define PCA9633_LEDOUT 0x08
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static const struct i2c_device_id pca9633_id[] = {
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{ "pca9633", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca9633_id);
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struct pca9633_led {
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struct i2c_client *client;
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struct work_struct work;
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enum led_brightness brightness;
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struct led_classdev led_cdev;
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int led_num; /* 0 .. 3 potentially */
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char name[32];
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};
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static void pca9633_led_work(struct work_struct *work)
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{
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struct pca9633_led *pca9633 = container_of(work,
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struct pca9633_led, work);
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u8 ledout = i2c_smbus_read_byte_data(pca9633->client, PCA9633_LEDOUT);
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int shift = 2 * pca9633->led_num;
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u8 mask = 0x3 << shift;
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switch (pca9633->brightness) {
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case LED_FULL:
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
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(ledout & ~mask) | (PCA9633_LED_ON << shift));
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break;
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case LED_OFF:
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
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ledout & ~mask);
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break;
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default:
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i2c_smbus_write_byte_data(pca9633->client,
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PCA9633_PWM_BASE + pca9633->led_num,
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pca9633->brightness);
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i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
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(ledout & ~mask) | (PCA9633_LED_PWM << shift));
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break;
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}
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}
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static void pca9633_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct pca9633_led *pca9633;
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pca9633 = container_of(led_cdev, struct pca9633_led, led_cdev);
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pca9633->brightness = value;
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/*
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* Must use workqueue for the actual I/O since I2C operations
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* can sleep.
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*/
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schedule_work(&pca9633->work);
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}
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static int __devinit pca9633_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pca9633_led *pca9633;
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struct i2c_adapter *adapter;
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struct led_platform_data *pdata;
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int i, err;
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adapter = to_i2c_adapter(client->dev.parent);
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pdata = client->dev.platform_data;
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if (pdata) {
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if (pdata->num_leds <= 0 || pdata->num_leds > 4) {
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dev_err(&client->dev, "board info must claim at most 4 LEDs");
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return -EINVAL;
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}
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}
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pca9633 = kcalloc(4, sizeof(*pca9633), GFP_KERNEL);
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if (!pca9633)
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return -ENOMEM;
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i2c_set_clientdata(client, pca9633);
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for (i = 0; i < 4; i++) {
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pca9633[i].client = client;
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pca9633[i].led_num = i;
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/* Platform data can specify LED names and default triggers */
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if (pdata && i < pdata->num_leds) {
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if (pdata->leds[i].name)
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snprintf(pca9633[i].name,
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sizeof(pca9633[i].name), "pca9633:%s",
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pdata->leds[i].name);
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if (pdata->leds[i].default_trigger)
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pca9633[i].led_cdev.default_trigger =
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pdata->leds[i].default_trigger;
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} else {
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snprintf(pca9633[i].name, sizeof(pca9633[i].name),
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"pca9633:%d", i);
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}
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pca9633[i].led_cdev.name = pca9633[i].name;
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pca9633[i].led_cdev.brightness_set = pca9633_led_set;
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INIT_WORK(&pca9633[i].work, pca9633_led_work);
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err = led_classdev_register(&client->dev, &pca9633[i].led_cdev);
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if (err < 0)
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goto exit;
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}
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/* Disable LED all-call address and set normal mode */
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i2c_smbus_write_byte_data(client, PCA9633_MODE1, 0x00);
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/* Turn off LEDs */
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i2c_smbus_write_byte_data(client, PCA9633_LEDOUT, 0x00);
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return 0;
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exit:
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while (i--) {
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led_classdev_unregister(&pca9633[i].led_cdev);
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cancel_work_sync(&pca9633[i].work);
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}
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kfree(pca9633);
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return err;
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}
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static int __devexit pca9633_remove(struct i2c_client *client)
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{
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struct pca9633_led *pca9633 = i2c_get_clientdata(client);
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int i;
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for (i = 0; i < 4; i++) {
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led_classdev_unregister(&pca9633[i].led_cdev);
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cancel_work_sync(&pca9633[i].work);
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}
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kfree(pca9633);
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return 0;
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}
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static struct i2c_driver pca9633_driver = {
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.driver = {
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.name = "leds-pca9633",
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.owner = THIS_MODULE,
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},
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.probe = pca9633_probe,
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.remove = __devexit_p(pca9633_remove),
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.id_table = pca9633_id,
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};
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module_i2c_driver(pca9633_driver);
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MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");
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MODULE_DESCRIPTION("PCA9633 LED driver");
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MODULE_LICENSE("GPL v2");
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