diff options
Diffstat (limited to 'drivers/leds/leds-da9052.c')
| -rw-r--r-- | drivers/leds/leds-da9052.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/drivers/leds/leds-da9052.c b/drivers/leds/leds-da9052.c new file mode 100644 index 000000000..04060c862 --- /dev/null +++ b/drivers/leds/leds-da9052.c @@ -0,0 +1,191 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * LED Driver for Dialog DA9052 PMICs. + * + * Copyright(c) 2012 Dialog Semiconductor Ltd. + * + * Author: David Dajun Chen <dchen@diasemi.com> + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/leds.h> +#include <linux/slab.h> + +#include <linux/mfd/da9052/reg.h> +#include <linux/mfd/da9052/da9052.h> +#include <linux/mfd/da9052/pdata.h> + +#define DA9052_OPENDRAIN_OUTPUT 2 +#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) +#define DA9052_MASK_UPPER_NIBBLE 0xF0 +#define DA9052_MASK_LOWER_NIBBLE 0x0F +#define DA9052_NIBBLE_SHIFT 4 +#define DA9052_MAX_BRIGHTNESS 0x5f + +struct da9052_led { + struct led_classdev cdev; + struct da9052 *da9052; + unsigned char led_index; + unsigned char id; +}; + +static unsigned char led_reg[] = { + DA9052_LED_CONT_4_REG, + DA9052_LED_CONT_5_REG, +}; + +static int da9052_set_led_brightness(struct da9052_led *led, + enum led_brightness brightness) +{ + u8 val; + int error; + + val = (brightness & 0x7f) | DA9052_LED_CONT_DIM; + + error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); + if (error < 0) + dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", + error); + return error; +} + +static int da9052_led_set(struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct da9052_led *led = + container_of(led_cdev, struct da9052_led, cdev); + + return da9052_set_led_brightness(led, value); +} + +static int da9052_configure_leds(struct da9052 *da9052) +{ + int error; + unsigned char register_value = DA9052_OPENDRAIN_OUTPUT + | DA9052_SET_HIGH_LVL_OUTPUT; + + error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, + DA9052_MASK_LOWER_NIBBLE, + register_value); + + if (error < 0) { + dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", + error); + return error; + } + + error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, + DA9052_MASK_UPPER_NIBBLE, + register_value << DA9052_NIBBLE_SHIFT); + if (error < 0) + dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", + error); + + return error; +} + +static int da9052_led_probe(struct platform_device *pdev) +{ + struct da9052_pdata *pdata; + struct da9052 *da9052; + struct led_platform_data *pled; + struct da9052_led *led = NULL; + int error = -ENODEV; + int i; + + da9052 = dev_get_drvdata(pdev->dev.parent); + pdata = dev_get_platdata(da9052->dev); + if (pdata == NULL) { + dev_err(&pdev->dev, "No platform data\n"); + goto err; + } + + pled = pdata->pled; + if (pled == NULL) { + dev_err(&pdev->dev, "No platform data for LED\n"); + goto err; + } + + led = devm_kcalloc(&pdev->dev, + pled->num_leds, sizeof(struct da9052_led), + GFP_KERNEL); + if (!led) { + error = -ENOMEM; + goto err; + } + + for (i = 0; i < pled->num_leds; i++) { + led[i].cdev.name = pled->leds[i].name; + led[i].cdev.brightness_set_blocking = da9052_led_set; + led[i].cdev.brightness = LED_OFF; + led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; + led[i].led_index = pled->leds[i].flags; + led[i].da9052 = dev_get_drvdata(pdev->dev.parent); + + error = led_classdev_register(pdev->dev.parent, &led[i].cdev); + if (error) { + dev_err(&pdev->dev, "Failed to register led %d\n", + led[i].led_index); + goto err_register; + } + + error = da9052_set_led_brightness(&led[i], + led[i].cdev.brightness); + if (error) { + dev_err(&pdev->dev, "Unable to init led %d\n", + led[i].led_index); + continue; + } + } + error = da9052_configure_leds(led->da9052); + if (error) { + dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); + goto err_register; + } + + platform_set_drvdata(pdev, led); + + return 0; + +err_register: + for (i = i - 1; i >= 0; i--) + led_classdev_unregister(&led[i].cdev); +err: + return error; +} + +static int da9052_led_remove(struct platform_device *pdev) +{ + struct da9052_led *led = platform_get_drvdata(pdev); + struct da9052_pdata *pdata; + struct da9052 *da9052; + struct led_platform_data *pled; + int i; + + da9052 = dev_get_drvdata(pdev->dev.parent); + pdata = dev_get_platdata(da9052->dev); + pled = pdata->pled; + + for (i = 0; i < pled->num_leds; i++) { + da9052_set_led_brightness(&led[i], LED_OFF); + led_classdev_unregister(&led[i].cdev); + } + + return 0; +} + +static struct platform_driver da9052_led_driver = { + .driver = { + .name = "da9052-leds", + }, + .probe = da9052_led_probe, + .remove = da9052_led_remove, +}; + +module_platform_driver(da9052_led_driver); + +MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); +MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); +MODULE_LICENSE("GPL"); |