| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame] | 1 | /* drivers/leds/leds-s3c24xx.c |
| 2 | * |
| 3 | * (c) 2006 Simtec Electronics |
| 4 | * http://armlinux.simtec.co.uk/ |
| 5 | * Ben Dooks <ben@simtec.co.uk> |
| 6 | * |
| 7 | * S3C24XX - LEDs GPIO driver |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/leds.h> |
| 17 | #include <linux/gpio.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/platform_data/leds-s3c24xx.h> |
| 21 | |
| 22 | #include <mach/regs-gpio.h> |
| 23 | #include <plat/gpio-cfg.h> |
| 24 | |
| 25 | /* our context */ |
| 26 | |
| 27 | struct s3c24xx_gpio_led { |
| 28 | struct led_classdev cdev; |
| 29 | struct s3c24xx_led_platdata *pdata; |
| 30 | }; |
| 31 | |
| 32 | static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev) |
| 33 | { |
| 34 | return container_of(led_cdev, struct s3c24xx_gpio_led, cdev); |
| 35 | } |
| 36 | |
| 37 | static void s3c24xx_led_set(struct led_classdev *led_cdev, |
| 38 | enum led_brightness value) |
| 39 | { |
| 40 | struct s3c24xx_gpio_led *led = to_gpio(led_cdev); |
| 41 | struct s3c24xx_led_platdata *pd = led->pdata; |
| 42 | int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW); |
| 43 | |
| 44 | /* there will be a short delay between setting the output and |
| 45 | * going from output to input when using tristate. */ |
| 46 | |
| 47 | gpio_set_value(pd->gpio, state); |
| 48 | |
| 49 | if (pd->flags & S3C24XX_LEDF_TRISTATE) { |
| 50 | if (value) |
| 51 | gpio_direction_output(pd->gpio, state); |
| 52 | else |
| 53 | gpio_direction_input(pd->gpio); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | static int s3c24xx_led_probe(struct platform_device *dev) |
| 58 | { |
| 59 | struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev); |
| 60 | struct s3c24xx_gpio_led *led; |
| 61 | int ret; |
| 62 | |
| 63 | led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led), |
| 64 | GFP_KERNEL); |
| 65 | if (!led) |
| 66 | return -ENOMEM; |
| 67 | |
| 68 | led->cdev.brightness_set = s3c24xx_led_set; |
| 69 | led->cdev.default_trigger = pdata->def_trigger; |
| 70 | led->cdev.name = pdata->name; |
| 71 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
| 72 | |
| 73 | led->pdata = pdata; |
| 74 | |
| 75 | ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED"); |
| 76 | if (ret < 0) |
| 77 | return ret; |
| 78 | |
| 79 | /* no point in having a pull-up if we are always driving */ |
| 80 | |
| 81 | s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE); |
| 82 | |
| 83 | if (pdata->flags & S3C24XX_LEDF_TRISTATE) |
| 84 | gpio_direction_input(pdata->gpio); |
| 85 | else |
| 86 | gpio_direction_output(pdata->gpio, |
| 87 | pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0); |
| 88 | |
| 89 | /* register our new led device */ |
| 90 | |
| 91 | ret = devm_led_classdev_register(&dev->dev, &led->cdev); |
| 92 | if (ret < 0) |
| 93 | dev_err(&dev->dev, "led_classdev_register failed\n"); |
| 94 | |
| 95 | return ret; |
| 96 | } |
| 97 | |
| 98 | static struct platform_driver s3c24xx_led_driver = { |
| 99 | .probe = s3c24xx_led_probe, |
| 100 | .driver = { |
| 101 | .name = "s3c24xx_led", |
| 102 | }, |
| 103 | }; |
| 104 | |
| 105 | module_platform_driver(s3c24xx_led_driver); |
| 106 | |
| 107 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
| 108 | MODULE_DESCRIPTION("S3C24XX LED driver"); |
| 109 | MODULE_LICENSE("GPL"); |
| 110 | MODULE_ALIAS("platform:s3c24xx_led"); |