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| 1 | +/* |
| 2 | + * Backlight driver for Dialog Semiconductor DA9030/DA9034 |
| 3 | + * |
| 4 | + * Copyright (C) 2008 Compulab, Ltd. |
| 5 | + * Mike Rapoport <[email protected]> |
| 6 | + * |
| 7 | + * Copyright (C) 2006-2008 Marvell International Ltd. |
| 8 | + |
| 9 | + * |
| 10 | + * This program is free software; you can redistribute it and/or modify |
| 11 | + * it under the terms of the GNU General Public License version 2 as |
| 12 | + * published by the Free Software Foundation. |
| 13 | + */ |
| 14 | + |
| 15 | +#include <linux/kernel.h> |
| 16 | +#include <linux/init.h> |
| 17 | +#include <linux/platform_device.h> |
| 18 | +#include <linux/fb.h> |
| 19 | +#include <linux/backlight.h> |
| 20 | +#include <linux/mfd/da903x.h> |
| 21 | + |
| 22 | +#define DA9030_WLED_CONTROL 0x25 |
| 23 | +#define DA9030_WLED_CP_EN (1 << 6) |
| 24 | +#define DA9030_WLED_TRIM(x) ((x) & 0x7) |
| 25 | + |
| 26 | +#define DA9034_WLED_CONTROL1 0x3C |
| 27 | +#define DA9034_WLED_CONTROL2 0x3D |
| 28 | + |
| 29 | +#define DA9034_WLED_BOOST_EN (1 << 5) |
| 30 | + |
| 31 | +#define DA9030_MAX_BRIGHTNESS 7 |
| 32 | +#define DA9034_MAX_BRIGHTNESS 0x7f |
| 33 | + |
| 34 | +struct da903x_backlight_data { |
| 35 | + struct device *da903x_dev; |
| 36 | + int id; |
| 37 | + int current_brightness; |
| 38 | +}; |
| 39 | + |
| 40 | +static int da903x_backlight_set(struct backlight_device *bl, int brightness) |
| 41 | +{ |
| 42 | + struct da903x_backlight_data *data = bl_get_data(bl); |
| 43 | + struct device *dev = data->da903x_dev; |
| 44 | + uint8_t val; |
| 45 | + int ret = 0; |
| 46 | + |
| 47 | + switch (data->id) { |
| 48 | + case DA9034_ID_WLED: |
| 49 | + ret = da903x_update(dev, DA9034_WLED_CONTROL1, |
| 50 | + brightness, 0x7f); |
| 51 | + if (ret) |
| 52 | + return ret; |
| 53 | + |
| 54 | + if (data->current_brightness && brightness == 0) |
| 55 | + ret = da903x_clr_bits(dev, |
| 56 | + DA9034_WLED_CONTROL2, |
| 57 | + DA9034_WLED_BOOST_EN); |
| 58 | + |
| 59 | + if (data->current_brightness == 0 && brightness) |
| 60 | + ret = da903x_set_bits(dev, |
| 61 | + DA9034_WLED_CONTROL2, |
| 62 | + DA9034_WLED_BOOST_EN); |
| 63 | + break; |
| 64 | + case DA9030_ID_WLED: |
| 65 | + val = DA9030_WLED_TRIM(brightness); |
| 66 | + val |= brightness ? DA9030_WLED_CP_EN : 0; |
| 67 | + ret = da903x_write(dev, DA9030_WLED_CONTROL, val); |
| 68 | + break; |
| 69 | + } |
| 70 | + |
| 71 | + if (ret) |
| 72 | + return ret; |
| 73 | + |
| 74 | + data->current_brightness = brightness; |
| 75 | + return 0; |
| 76 | +} |
| 77 | + |
| 78 | +static int da903x_backlight_update_status(struct backlight_device *bl) |
| 79 | +{ |
| 80 | + int brightness = bl->props.brightness; |
| 81 | + |
| 82 | + if (bl->props.power != FB_BLANK_UNBLANK) |
| 83 | + brightness = 0; |
| 84 | + |
| 85 | + if (bl->props.fb_blank != FB_BLANK_UNBLANK) |
| 86 | + brightness = 0; |
| 87 | + |
| 88 | + return da903x_backlight_set(bl, brightness); |
| 89 | +} |
| 90 | + |
| 91 | +static int da903x_backlight_get_brightness(struct backlight_device *bl) |
| 92 | +{ |
| 93 | + struct da903x_backlight_data *data = bl_get_data(bl); |
| 94 | + return data->current_brightness; |
| 95 | +} |
| 96 | + |
| 97 | +static struct backlight_ops da903x_backlight_ops = { |
| 98 | + .update_status = da903x_backlight_update_status, |
| 99 | + .get_brightness = da903x_backlight_get_brightness, |
| 100 | +}; |
| 101 | + |
| 102 | +static int da903x_backlight_probe(struct platform_device *pdev) |
| 103 | +{ |
| 104 | + struct da903x_backlight_data *data; |
| 105 | + struct backlight_device *bl; |
| 106 | + int max_brightness; |
| 107 | + |
| 108 | + data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 109 | + if (data == NULL) |
| 110 | + return -ENOMEM; |
| 111 | + |
| 112 | + switch (pdev->id) { |
| 113 | + case DA9030_ID_WLED: |
| 114 | + max_brightness = DA9030_MAX_BRIGHTNESS; |
| 115 | + break; |
| 116 | + case DA9034_ID_WLED: |
| 117 | + max_brightness = DA9034_MAX_BRIGHTNESS; |
| 118 | + break; |
| 119 | + default: |
| 120 | + dev_err(&pdev->dev, "invalid backlight device ID(%d)\n", |
| 121 | + pdev->id); |
| 122 | + return -EINVAL; |
| 123 | + } |
| 124 | + |
| 125 | + data->id = pdev->id; |
| 126 | + data->da903x_dev = pdev->dev.parent; |
| 127 | + data->current_brightness = 0; |
| 128 | + |
| 129 | + bl = backlight_device_register(pdev->name, data->da903x_dev, |
| 130 | + data, &da903x_backlight_ops); |
| 131 | + if (IS_ERR(bl)) { |
| 132 | + dev_err(&pdev->dev, "failed to register backlight\n"); |
| 133 | + return PTR_ERR(bl); |
| 134 | + } |
| 135 | + |
| 136 | + bl->props.max_brightness = max_brightness; |
| 137 | + bl->props.brightness = max_brightness; |
| 138 | + |
| 139 | + platform_set_drvdata(pdev, bl); |
| 140 | + backlight_update_status(bl); |
| 141 | + return 0; |
| 142 | +} |
| 143 | + |
| 144 | +static int da903x_backlight_remove(struct platform_device *pdev) |
| 145 | +{ |
| 146 | + struct backlight_device *bl = platform_get_drvdata(pdev); |
| 147 | + struct da903x_backlight_data *data = bl_get_data(bl); |
| 148 | + |
| 149 | + backlight_device_unregister(bl); |
| 150 | + kfree(data); |
| 151 | + return 0; |
| 152 | +} |
| 153 | + |
| 154 | +#ifdef CONFIG_PM |
| 155 | +static int da903x_backlight_suspend(struct platform_device *pdev, |
| 156 | + pm_message_t state) |
| 157 | +{ |
| 158 | + struct backlight_device *bl = platform_get_drvdata(pdev); |
| 159 | + return da903x_backlight_set(bl, 0); |
| 160 | +} |
| 161 | + |
| 162 | +static int da903x_backlight_resume(struct platform_device *pdev) |
| 163 | +{ |
| 164 | + struct backlight_device *bl = platform_get_drvdata(pdev); |
| 165 | + |
| 166 | + backlight_update_status(bl); |
| 167 | + return 0; |
| 168 | +} |
| 169 | +#else |
| 170 | +#define da903x_backlight_suspend NULL |
| 171 | +#define da903x_backlight_resume NULL |
| 172 | +#endif |
| 173 | + |
| 174 | +static struct platform_driver da903x_backlight_driver = { |
| 175 | + .driver = { |
| 176 | + .name = "da903x-backlight", |
| 177 | + .owner = THIS_MODULE, |
| 178 | + }, |
| 179 | + .probe = da903x_backlight_probe, |
| 180 | + .remove = da903x_backlight_remove, |
| 181 | + .suspend = da903x_backlight_suspend, |
| 182 | + .resume = da903x_backlight_resume, |
| 183 | +}; |
| 184 | + |
| 185 | +static int __init da903x_backlight_init(void) |
| 186 | +{ |
| 187 | + return platform_driver_register(&da903x_backlight_driver); |
| 188 | +} |
| 189 | +module_init(da903x_backlight_init); |
| 190 | + |
| 191 | +static void __exit da903x_backlight_exit(void) |
| 192 | +{ |
| 193 | + platform_driver_unregister(&da903x_backlight_driver); |
| 194 | +} |
| 195 | +module_exit(da903x_backlight_exit); |
| 196 | + |
| 197 | +MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034"); |
| 198 | +MODULE_AUTHOR( "Eric Miao <[email protected]>" |
| 199 | + "Mike Rapoport <[email protected]>"); |
| 200 | +MODULE_LICENSE("GPL"); |
| 201 | +MODULE_ALIAS("platform:da903x-backlight"); |
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