diff options
author | Peter Meerwald <p.meerwald@bct-electronic.com> | 2012-03-23 15:02:10 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-23 16:58:35 -0700 |
commit | 75cb2e1d1a53e732ebc81e7c4fa781aa8d7a9619 (patch) | |
tree | cd2b0edb7792f8b0bb0adbdc1b121b853f4e5d1d /drivers | |
parent | d06cb46c3e59e4f212bc7b86720a073a1aee1f63 (diff) |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/leds/Kconfig | 8 | ||||
-rw-r--r-- | drivers/leds/Makefile | 1 | ||||
-rw-r--r-- | drivers/leds/leds-pca9633.c | 195 |
3 files changed, 204 insertions, 0 deletions
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 8c7a75d5310..e2ac190df52 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -234,6 +234,14 @@ config LEDS_PCA955X LED driver chips accessed via the I2C bus. Supported devices include PCA9550, PCA9551, PCA9552, and PCA9553. +config LEDS_PCA9633 + tristate "LED support for PCA9633 I2C chip" + depends on LEDS_CLASS + depends on I2C + help + This option enables support for LEDs connected to the PCA9633 + LED driver chip accessed via the I2C bus. + 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 6bcf4f69551..fa0f428b32f 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o obj-$(CONFIG_LEDS_OT200) += leds-ot200.o obj-$(CONFIG_LEDS_FSG) += leds-fsg.o obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o +obj-$(CONFIG_LEDS_PCA9633) += leds-pca9633.o obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o diff --git a/drivers/leds/leds-pca9633.c b/drivers/leds/leds-pca9633.c new file mode 100644 index 00000000000..80cb61adc2d --- /dev/null +++ b/drivers/leds/leds-pca9633.c @@ -0,0 +1,195 @@ +/* + * Copyright 2011 bct electronic GmbH + * + * Author: Peter Meerwald <p.meerwald@bct-electronic.com> + * + * Based on leds-pca955x.c + * + * 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. + * + * LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62) + * + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/ctype.h> +#include <linux/leds.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/workqueue.h> +#include <linux/slab.h> + +/* LED select registers determine the source that drives LED outputs */ +#define PCA9633_LED_OFF 0x0 /* LED driver off */ +#define PCA9633_LED_ON 0x1 /* LED driver on */ +#define PCA9633_LED_PWM 0x2 /* Controlled through PWM */ +#define PCA9633_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */ + +#define PCA9633_MODE1 0x00 +#define PCA9633_MODE2 0x01 +#define PCA9633_PWM_BASE 0x02 +#define PCA9633_LEDOUT 0x08 + +static const struct i2c_device_id pca9633_id[] = { + { "pca9633", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, pca9633_id); + +struct pca9633_led { + struct i2c_client *client; + struct work_struct work; + enum led_brightness brightness; + struct led_classdev led_cdev; + int led_num; /* 0 .. 3 potentially */ + char name[32]; +}; + +static void pca9633_led_work(struct work_struct *work) +{ + struct pca9633_led *pca9633 = container_of(work, + struct pca9633_led, work); + u8 ledout = i2c_smbus_read_byte_data(pca9633->client, PCA9633_LEDOUT); + int shift = 2 * pca9633->led_num; + u8 mask = 0x3 << shift; + + switch (pca9633->brightness) { + case LED_FULL: + i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, + (ledout & ~mask) | (PCA9633_LED_ON << shift)); + break; + case LED_OFF: + i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, + ledout & ~mask); + break; + default: + i2c_smbus_write_byte_data(pca9633->client, + PCA9633_PWM_BASE + pca9633->led_num, + pca9633->brightness); + i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, + (ledout & ~mask) | (PCA9633_LED_PWM << shift)); + break; + } +} + +static void pca9633_led_set(struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct pca9633_led *pca9633; + + pca9633 = container_of(led_cdev, struct pca9633_led, led_cdev); + + pca9633->brightness = value; + + /* + * Must use workqueue for the actual I/O since I2C operations + * can sleep. + */ + schedule_work(&pca9633->work); +} + +static int __devinit pca9633_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct pca9633_led *pca9633; + struct i2c_adapter *adapter; + struct led_platform_data *pdata; + int i, err; + + adapter = to_i2c_adapter(client->dev.parent); + pdata = client->dev.platform_data; + + if (pdata) { + if (pdata->num_leds <= 0 || pdata->num_leds > 4) { + dev_err(&client->dev, "board info must claim at most 4 LEDs"); + return -EINVAL; + } + } + + pca9633 = kcalloc(4, sizeof(*pca9633), GFP_KERNEL); + if (!pca9633) + return -ENOMEM; + + i2c_set_clientdata(client, pca9633); + + for (i = 0; i < 4; i++) { + pca9633[i].client = client; + pca9633[i].led_num = i; + + /* Platform data can specify LED names and default triggers */ + if (pdata && i < pdata->num_leds) { + if (pdata->leds[i].name) + snprintf(pca9633[i].name, + sizeof(pca9633[i].name), "pca9633:%s", + pdata->leds[i].name); + if (pdata->leds[i].default_trigger) + pca9633[i].led_cdev.default_trigger = + pdata->leds[i].default_trigger; + } else { + snprintf(pca9633[i].name, sizeof(pca9633[i].name), + "pca9633:%d", i); + } + + pca9633[i].led_cdev.name = pca9633[i].name; + pca9633[i].led_cdev.brightness_set = pca9633_led_set; + + INIT_WORK(&pca9633[i].work, pca9633_led_work); + + err = led_classdev_register(&client->dev, &pca9633[i].led_cdev); + if (err < 0) + goto exit; + } + + /* Disable LED all-call address and set normal mode */ + i2c_smbus_write_byte_data(client, PCA9633_MODE1, 0x00); + + /* Turn off LEDs */ + i2c_smbus_write_byte_data(client, PCA9633_LEDOUT, 0x00); + + return 0; + +exit: + while (i--) { + led_classdev_unregister(&pca9633[i].led_cdev); + cancel_work_sync(&pca9633[i].work); + } + + kfree(pca9633); + + return err; +} + +static int __devexit pca9633_remove(struct i2c_client *client) +{ + struct pca9633_led *pca9633 = i2c_get_clientdata(client); + int i; + + for (i = 0; i < 4; i++) { + led_classdev_unregister(&pca9633[i].led_cdev); + cancel_work_sync(&pca9633[i].work); + } + + kfree(pca9633); + + return 0; +} + +static struct i2c_driver pca9633_driver = { + .driver = { + .name = "leds-pca9633", + .owner = THIS_MODULE, + }, + .probe = pca9633_probe, + .remove = __devexit_p(pca9633_remove), + .id_table = pca9633_id, +}; + +module_i2c_driver(pca9633_driver); + +MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>"); +MODULE_DESCRIPTION("PCA9633 LED driver"); +MODULE_LICENSE("GPL v2"); |