projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 82e5c40d LP |
1 | /* |
| 2 | * Sanyo LV5207LP LED Driver | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Ideas on board SPRL | |
| 5 | * | |
| 6 | * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License version 2 as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/backlight.h> | |
| 14 | #include <linux/err.h> | |
| 15 | #include <linux/fb.h> | |
| 16 | #include <linux/i2c.h> | |
| 17 | #include <linux/module.h> | |
| 18 | #include <linux/platform_data/lv5207lp.h> | |
| 19 | #include <linux/slab.h> | |
| 20 | ||
| 21 | #define LV5207LP_CTRL1 0x00 | |
| 22 | #define LV5207LP_CPSW (1 << 7) | |
| 23 | #define LV5207LP_SCTEN (1 << 6) | |
| 24 | #define LV5207LP_C10 (1 << 5) | |
| 25 | #define LV5207LP_CKSW (1 << 4) | |
| 26 | #define LV5207LP_RSW (1 << 3) | |
| 27 | #define LV5207LP_GSW (1 << 2) | |
| 28 | #define LV5207LP_BSW (1 << 1) | |
| 29 | #define LV5207LP_CTRL2 0x01 | |
| 30 | #define LV5207LP_MSW (1 << 7) | |
| 31 | #define LV5207LP_MLED4 (1 << 6) | |
| 32 | #define LV5207LP_RED 0x02 | |
| 33 | #define LV5207LP_GREEN 0x03 | |
| 34 | #define LV5207LP_BLUE 0x04 | |
| 35 | ||
| 36 | #define LV5207LP_MAX_BRIGHTNESS 32 | |
| 37 | ||
| 38 | struct lv5207lp { | |
| 39 | struct i2c_client *client; | |
| 40 | struct backlight_device *backlight; | |
| 41 | struct lv5207lp_platform_data *pdata; | |
| 42 | }; | |
| 43 | ||
| 44 | static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data) | |
| 45 | { | |
| 46 | return i2c_smbus_write_byte_data(lv->client, reg, data); | |
| 47 | } | |
| 48 | ||
| 49 | static int lv5207lp_backlight_update_status(struct backlight_device *backlight) | |
| 50 | { | |
| 51 | struct lv5207lp *lv = bl_get_data(backlight); | |
| 52 | int brightness = backlight->props.brightness; | |
| 53 | ||
| 54 | if (backlight->props.power != FB_BLANK_UNBLANK || | |
| 55 | backlight->props.fb_blank != FB_BLANK_UNBLANK || | |
| 56 | backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) | |
| 57 | brightness = 0; | |
| 58 | ||
| 59 | if (brightness) { | |
| 60 | lv5207lp_write(lv, LV5207LP_CTRL1, | |
| 61 | LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW); | |
| 62 | lv5207lp_write(lv, LV5207LP_CTRL2, | |
| 63 | LV5207LP_MSW | LV5207LP_MLED4 | | |
| 64 | (brightness - 1)); | |
| 65 | } else { | |
| 66 | lv5207lp_write(lv, LV5207LP_CTRL1, 0); | |
| 67 | lv5207lp_write(lv, LV5207LP_CTRL2, 0); | |
| 68 | } | |
| 69 | ||
| 70 | return 0; | |
| 71 | } | |
| 72 | ||
| 82e5c40d LP |
73 | static int lv5207lp_backlight_check_fb(struct backlight_device *backlight, |
| 74 | struct fb_info *info) | |
| 75 | { | |
| 76 | struct lv5207lp *lv = bl_get_data(backlight); | |
| 77 | ||
| 78 | return lv->pdata->fbdev == NULL || lv->pdata->fbdev == info->dev; | |
| 79 | } | |
| 80 | ||
| 81 | static const struct backlight_ops lv5207lp_backlight_ops = { | |
| 82 | .options = BL_CORE_SUSPENDRESUME, | |
| 83 | .update_status = lv5207lp_backlight_update_status, | |
| 82e5c40d LP |
84 | .check_fb = lv5207lp_backlight_check_fb, |
| 85 | }; | |
| 86 | ||
| 87 | static int lv5207lp_probe(struct i2c_client *client, | |
| 88 | const struct i2c_device_id *id) | |
| 89 | { | |
| c512794c | 90 | struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev); |
| 82e5c40d LP |
91 | struct backlight_device *backlight; |
| 92 | struct backlight_properties props; | |
| 93 | struct lv5207lp *lv; | |
| 94 | ||
| 95 | if (pdata == NULL) { | |
| 96 | dev_err(&client->dev, "No platform data supplied\n"); | |
| 97 | return -EINVAL; | |
| 98 | } | |
| 99 | ||
| 100 | if (!i2c_check_functionality(client->adapter, | |
| 101 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
| 102 | dev_warn(&client->dev, | |
| 103 | "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); | |
| 104 | return -EIO; | |
| 105 | } | |
| 106 | ||
| 107 | lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL); | |
| 108 | if (!lv) | |
| 109 | return -ENOMEM; | |
| 110 | ||
| 111 | lv->client = client; | |
| 112 | lv->pdata = pdata; | |
| 113 | ||
| 114 | memset(&props, 0, sizeof(props)); | |
| 115 | props.type = BACKLIGHT_RAW; | |
| 116 | props.max_brightness = min_t(unsigned int, pdata->max_value, | |
| 117 | LV5207LP_MAX_BRIGHTNESS); | |
| 118 | props.brightness = clamp_t(unsigned int, pdata->def_value, 0, | |
| 119 | props.max_brightness); | |
| 120 | ||
| e924c2aa JH |
121 | backlight = devm_backlight_device_register(&client->dev, |
| 122 | dev_name(&client->dev), &lv->client->dev, | |
| 123 | lv, &lv5207lp_backlight_ops, &props); | |
| 82e5c40d LP |
124 | if (IS_ERR(backlight)) { |
| 125 | dev_err(&client->dev, "failed to register backlight\n"); | |
| 126 | return PTR_ERR(backlight); | |
| 127 | } | |
| 128 | ||
| 129 | backlight_update_status(backlight); | |
| 130 | i2c_set_clientdata(client, backlight); | |
| 131 | ||
| 132 | return 0; | |
| 133 | } | |
| 134 | ||
| 135 | static int lv5207lp_remove(struct i2c_client *client) | |
| 136 | { | |
| 137 | struct backlight_device *backlight = i2c_get_clientdata(client); | |
| 138 | ||
| 139 | backlight->props.brightness = 0; | |
| 140 | backlight_update_status(backlight); | |
| 82e5c40d LP |
141 | |
| 142 | return 0; | |
| 143 | } | |
| 144 | ||
| 145 | static const struct i2c_device_id lv5207lp_ids[] = { | |
| 146 | { "lv5207lp", 0 }, | |
| 147 | { } | |
| 148 | }; | |
| 149 | MODULE_DEVICE_TABLE(i2c, lv5207lp_ids); | |
| 150 | ||
| 151 | static struct i2c_driver lv5207lp_driver = { | |
| 152 | .driver = { | |
| 153 | .name = "lv5207lp", | |
| 154 | }, | |
| 155 | .probe = lv5207lp_probe, | |
| 156 | .remove = lv5207lp_remove, | |
| 157 | .id_table = lv5207lp_ids, | |
| 158 | }; | |
| 159 | ||
| 160 | module_i2c_driver(lv5207lp_driver); | |
| 161 | ||
| 162 | MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver"); | |
| 163 | MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); | |
| 164 | MODULE_LICENSE("GPL"); |