diff options
Diffstat (limited to 'drivers/video/backlight/ot200_bl.c')
| -rw-r--r-- | drivers/video/backlight/ot200_bl.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/drivers/video/backlight/ot200_bl.c b/drivers/video/backlight/ot200_bl.c deleted file mode 100644 index 23ee7106c72a..000000000000 --- a/drivers/video/backlight/ot200_bl.c +++ /dev/null @@ -1,162 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2012 Bachmann electronic GmbH - * Christian Gmeiner <christian.gmeiner@gmail.com> - * - * Backlight driver for ot200 visualisation device from - * Bachmann electronic GmbH. - */ - -#include <linux/module.h> -#include <linux/fb.h> -#include <linux/backlight.h> -#include <linux/gpio.h> -#include <linux/platform_device.h> -#include <linux/cs5535.h> - -static struct cs5535_mfgpt_timer *pwm_timer; - -/* this array defines the mapping of brightness in % to pwm frequency */ -static const u8 dim_table[101] = {0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, - 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, - 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 9, 9, - 10, 10, 11, 11, 12, 12, 13, 14, 15, 15, 16, - 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, - 30, 31, 33, 35, 37, 39, 41, 43, 45, 47, 50, - 53, 55, 58, 61, 65, 68, 72, 75, 79, 84, 88, - 93, 97, 103, 108, 114, 120, 126, 133, 140, - 147, 155, 163}; - -struct ot200_backlight_data { - int current_brightness; -}; - -#define GPIO_DIMM 27 -#define SCALE 1 -#define CMP1MODE 0x2 /* compare on GE; output high on compare - * greater than or equal */ -#define PWM_SETUP (SCALE | CMP1MODE << 6 | MFGPT_SETUP_CNTEN) -#define MAX_COMP2 163 - -static int ot200_backlight_update_status(struct backlight_device *bl) -{ - struct ot200_backlight_data *data = bl_get_data(bl); - int brightness = bl->props.brightness; - - if (bl->props.state & BL_CORE_FBBLANK) - brightness = 0; - - /* enable or disable PWM timer */ - if (brightness == 0) - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, 0); - else if (data->current_brightness == 0) { - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_COUNTER, 0); - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, - MFGPT_SETUP_CNTEN); - } - - /* apply new brightness value */ - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP1, - MAX_COMP2 - dim_table[brightness]); - data->current_brightness = brightness; - - return 0; -} - -static int ot200_backlight_get_brightness(struct backlight_device *bl) -{ - struct ot200_backlight_data *data = bl_get_data(bl); - return data->current_brightness; -} - -static const struct backlight_ops ot200_backlight_ops = { - .update_status = ot200_backlight_update_status, - .get_brightness = ot200_backlight_get_brightness, -}; - -static int ot200_backlight_probe(struct platform_device *pdev) -{ - struct backlight_device *bl; - struct ot200_backlight_data *data; - struct backlight_properties props; - int retval = 0; - - /* request gpio */ - if (devm_gpio_request(&pdev->dev, GPIO_DIMM, - "ot200 backlight dimmer") < 0) { - dev_err(&pdev->dev, "failed to request GPIO %d\n", GPIO_DIMM); - return -ENODEV; - } - - /* request timer */ - pwm_timer = cs5535_mfgpt_alloc_timer(7, MFGPT_DOMAIN_ANY); - if (!pwm_timer) { - dev_err(&pdev->dev, "MFGPT 7 not available\n"); - return -ENODEV; - } - - data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); - if (!data) { - retval = -ENOMEM; - goto error_devm_kzalloc; - } - - /* setup gpio */ - cs5535_gpio_set(GPIO_DIMM, GPIO_OUTPUT_ENABLE); - cs5535_gpio_set(GPIO_DIMM, GPIO_OUTPUT_AUX1); - - /* setup timer */ - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP1, 0); - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP2, MAX_COMP2); - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, PWM_SETUP); - - data->current_brightness = 100; - props.max_brightness = 100; - props.brightness = 100; - props.type = BACKLIGHT_RAW; - - bl = devm_backlight_device_register(&pdev->dev, dev_name(&pdev->dev), - &pdev->dev, data, &ot200_backlight_ops, - &props); - if (IS_ERR(bl)) { - dev_err(&pdev->dev, "failed to register backlight\n"); - retval = PTR_ERR(bl); - goto error_devm_kzalloc; - } - - platform_set_drvdata(pdev, bl); - - return 0; - -error_devm_kzalloc: - cs5535_mfgpt_free_timer(pwm_timer); - return retval; -} - -static int ot200_backlight_remove(struct platform_device *pdev) -{ - /* on module unload set brightness to 100% */ - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_COUNTER, 0); - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN); - cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP1, - MAX_COMP2 - dim_table[100]); - - cs5535_mfgpt_free_timer(pwm_timer); - - return 0; -} - -static struct platform_driver ot200_backlight_driver = { - .driver = { - .name = "ot200-backlight", - }, - .probe = ot200_backlight_probe, - .remove = ot200_backlight_remove, -}; - -module_platform_driver(ot200_backlight_driver); - -MODULE_DESCRIPTION("backlight driver for ot200 visualisation device"); -MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:ot200-backlight"); |