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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Sanyo LV5207LP LED Driver4 *5 * Copyright (C) 2013 Ideas on board SPRL6 *7 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>8 */9 10#include <linux/backlight.h>11#include <linux/err.h>12#include <linux/fb.h>13#include <linux/i2c.h>14#include <linux/module.h>15#include <linux/platform_data/lv5207lp.h>16#include <linux/slab.h>17 18#define LV5207LP_CTRL1 0x0019#define LV5207LP_CPSW (1 << 7)20#define LV5207LP_SCTEN (1 << 6)21#define LV5207LP_C10 (1 << 5)22#define LV5207LP_CKSW (1 << 4)23#define LV5207LP_RSW (1 << 3)24#define LV5207LP_GSW (1 << 2)25#define LV5207LP_BSW (1 << 1)26#define LV5207LP_CTRL2 0x0127#define LV5207LP_MSW (1 << 7)28#define LV5207LP_MLED4 (1 << 6)29#define LV5207LP_RED 0x0230#define LV5207LP_GREEN 0x0331#define LV5207LP_BLUE 0x0432 33#define LV5207LP_MAX_BRIGHTNESS 3234 35struct lv5207lp {36 struct i2c_client *client;37 struct backlight_device *backlight;38 struct lv5207lp_platform_data *pdata;39};40 41static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)42{43 return i2c_smbus_write_byte_data(lv->client, reg, data);44}45 46static int lv5207lp_backlight_update_status(struct backlight_device *backlight)47{48 struct lv5207lp *lv = bl_get_data(backlight);49 int brightness = backlight_get_brightness(backlight);50 51 if (brightness) {52 lv5207lp_write(lv, LV5207LP_CTRL1,53 LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW);54 lv5207lp_write(lv, LV5207LP_CTRL2,55 LV5207LP_MSW | LV5207LP_MLED4 |56 (brightness - 1));57 } else {58 lv5207lp_write(lv, LV5207LP_CTRL1, 0);59 lv5207lp_write(lv, LV5207LP_CTRL2, 0);60 }61 62 return 0;63}64 65static bool lv5207lp_backlight_controls_device(struct backlight_device *backlight,66 struct device *display_dev)67{68 struct lv5207lp *lv = bl_get_data(backlight);69 70 return !lv->pdata->dev || lv->pdata->dev == display_dev;71}72 73static const struct backlight_ops lv5207lp_backlight_ops = {74 .options = BL_CORE_SUSPENDRESUME,75 .update_status = lv5207lp_backlight_update_status,76 .controls_device = lv5207lp_backlight_controls_device,77};78 79static int lv5207lp_probe(struct i2c_client *client)80{81 struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev);82 struct backlight_device *backlight;83 struct backlight_properties props;84 struct lv5207lp *lv;85 86 if (pdata == NULL) {87 dev_err(&client->dev, "No platform data supplied\n");88 return -EINVAL;89 }90 91 if (!i2c_check_functionality(client->adapter,92 I2C_FUNC_SMBUS_BYTE_DATA)) {93 dev_warn(&client->dev,94 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");95 return -EIO;96 }97 98 lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);99 if (!lv)100 return -ENOMEM;101 102 lv->client = client;103 lv->pdata = pdata;104 105 memset(&props, 0, sizeof(props));106 props.type = BACKLIGHT_RAW;107 props.max_brightness = min_t(unsigned int, pdata->max_value,108 LV5207LP_MAX_BRIGHTNESS);109 props.brightness = clamp_t(unsigned int, pdata->def_value, 0,110 props.max_brightness);111 112 backlight = devm_backlight_device_register(&client->dev,113 dev_name(&client->dev), &lv->client->dev,114 lv, &lv5207lp_backlight_ops, &props);115 if (IS_ERR(backlight)) {116 dev_err(&client->dev, "failed to register backlight\n");117 return PTR_ERR(backlight);118 }119 120 backlight_update_status(backlight);121 i2c_set_clientdata(client, backlight);122 123 return 0;124}125 126static void lv5207lp_remove(struct i2c_client *client)127{128 struct backlight_device *backlight = i2c_get_clientdata(client);129 130 backlight->props.brightness = 0;131 backlight_update_status(backlight);132}133 134static const struct i2c_device_id lv5207lp_ids[] = {135 { "lv5207lp" },136 { }137};138MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);139 140static struct i2c_driver lv5207lp_driver = {141 .driver = {142 .name = "lv5207lp",143 },144 .probe = lv5207lp_probe,145 .remove = lv5207lp_remove,146 .id_table = lv5207lp_ids,147};148 149module_i2c_driver(lv5207lp_driver);150 151MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");152MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");153MODULE_LICENSE("GPL");154