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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ROHM Semiconductor BD6107 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/delay.h>12#include <linux/err.h>13#include <linux/fb.h>14#include <linux/gpio/consumer.h>15#include <linux/i2c.h>16#include <linux/module.h>17#include <linux/platform_data/bd6107.h>18#include <linux/slab.h>19 20#define BD6107_PSCNT1 0x0021#define BD6107_PSCNT1_PSCNTREG2 (1 << 2)22#define BD6107_PSCNT1_PSCNTREG1 (1 << 0)23#define BD6107_REGVSET 0x0224#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2)25#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2)26#define BD6107_LEDCNT1 0x0327#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1)28#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0)29#define BD6107_PORTSEL 0x0430#define BD6107_PORTSEL_LEDM(n) (1 << (n))31#define BD6107_RGB1CNT1 0x0532#define BD6107_RGB1CNT2 0x0633#define BD6107_RGB1CNT3 0x0734#define BD6107_RGB1CNT4 0x0835#define BD6107_RGB1CNT5 0x0936#define BD6107_RGB1FLM 0x0a37#define BD6107_RGB2CNT1 0x0b38#define BD6107_RGB2CNT2 0x0c39#define BD6107_RGB2CNT3 0x0d40#define BD6107_RGB2CNT4 0x0e41#define BD6107_RGB2CNT5 0x0f42#define BD6107_RGB2FLM 0x1043#define BD6107_PSCONT3 0x1144#define BD6107_SMMONCNT 0x1245#define BD6107_DCDCCNT 0x1346#define BD6107_IOSEL 0x1447#define BD6107_OUT1 0x1548#define BD6107_OUT2 0x1649#define BD6107_MASK1 0x1750#define BD6107_MASK2 0x1851#define BD6107_FACTOR1 0x1952#define BD6107_FACTOR2 0x1a53#define BD6107_CLRFACT1 0x1b54#define BD6107_CLRFACT2 0x1c55#define BD6107_STATE1 0x1d56#define BD6107_LSIVER 0x1e57#define BD6107_GRPSEL 0x1f58#define BD6107_LEDCNT2 0x2059#define BD6107_LEDCNT3 0x2160#define BD6107_MCURRENT 0x2261#define BD6107_MAINCNT1 0x2362#define BD6107_MAINCNT2 0x2463#define BD6107_SLOPECNT 0x2564#define BD6107_MSLOPE 0x2665#define BD6107_RGBSLOPE 0x2766#define BD6107_TEST 0x2967#define BD6107_SFTRST 0x2a68#define BD6107_SFTRSTGD 0x2b69 70struct bd6107 {71 struct i2c_client *client;72 struct backlight_device *backlight;73 struct bd6107_platform_data *pdata;74 struct gpio_desc *reset;75};76 77static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data)78{79 return i2c_smbus_write_byte_data(bd->client, reg, data);80}81 82static int bd6107_backlight_update_status(struct backlight_device *backlight)83{84 struct bd6107 *bd = bl_get_data(backlight);85 int brightness = backlight_get_brightness(backlight);86 87 if (brightness) {88 bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) |89 BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0));90 bd6107_write(bd, BD6107_MAINCNT1, brightness);91 bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1);92 } else {93 /* Assert the reset line (gpiolib will handle active low) */94 gpiod_set_value(bd->reset, 1);95 msleep(24);96 gpiod_set_value(bd->reset, 0);97 }98 99 return 0;100}101 102static bool bd6107_backlight_controls_device(struct backlight_device *backlight,103 struct device *display_dev)104{105 struct bd6107 *bd = bl_get_data(backlight);106 107 return !bd->pdata->dev || bd->pdata->dev == display_dev;108}109 110static const struct backlight_ops bd6107_backlight_ops = {111 .options = BL_CORE_SUSPENDRESUME,112 .update_status = bd6107_backlight_update_status,113 .controls_device = bd6107_backlight_controls_device,114};115 116static int bd6107_probe(struct i2c_client *client)117{118 struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev);119 struct backlight_device *backlight;120 struct backlight_properties props;121 struct bd6107 *bd;122 123 if (pdata == NULL) {124 dev_err(&client->dev, "No platform data\n");125 return -EINVAL;126 }127 128 if (!i2c_check_functionality(client->adapter,129 I2C_FUNC_SMBUS_BYTE_DATA)) {130 dev_warn(&client->dev,131 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");132 return -EIO;133 }134 135 bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);136 if (!bd)137 return -ENOMEM;138 139 bd->client = client;140 bd->pdata = pdata;141 142 /*143 * Request the reset GPIO line with GPIOD_OUT_HIGH meaning asserted,144 * so in the machine descriptor table (or other hardware description),145 * the line should be flagged as active low so this will assert146 * the reset.147 */148 bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);149 if (IS_ERR(bd->reset))150 return dev_err_probe(&client->dev, PTR_ERR(bd->reset),151 "unable to request reset GPIO\n");152 153 memset(&props, 0, sizeof(props));154 props.type = BACKLIGHT_RAW;155 props.max_brightness = 128;156 props.brightness = clamp_t(unsigned int, pdata->def_value, 0,157 props.max_brightness);158 159 backlight = devm_backlight_device_register(&client->dev,160 dev_name(&client->dev),161 &bd->client->dev, bd,162 &bd6107_backlight_ops, &props);163 if (IS_ERR(backlight)) {164 dev_err(&client->dev, "failed to register backlight\n");165 return PTR_ERR(backlight);166 }167 168 backlight_update_status(backlight);169 i2c_set_clientdata(client, backlight);170 171 return 0;172}173 174static void bd6107_remove(struct i2c_client *client)175{176 struct backlight_device *backlight = i2c_get_clientdata(client);177 178 backlight->props.brightness = 0;179 backlight_update_status(backlight);180}181 182static const struct i2c_device_id bd6107_ids[] = {183 { "bd6107" },184 { }185};186MODULE_DEVICE_TABLE(i2c, bd6107_ids);187 188static struct i2c_driver bd6107_driver = {189 .driver = {190 .name = "bd6107",191 },192 .probe = bd6107_probe,193 .remove = bd6107_remove,194 .id_table = bd6107_ids,195};196 197module_i2c_driver(bd6107_driver);198 199MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");200MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");201MODULE_LICENSE("GPL");202