1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ROHM Semiconductor BD6107 LED Driver 4 * 5 * Copyright (C) 2013 Ideas on board SPRL 6 * 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.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 0x00 21 #define BD6107_PSCNT1_PSCNTREG2 (1 << 2) 22 #define BD6107_PSCNT1_PSCNTREG1 (1 << 0) 23 #define BD6107_REGVSET 0x02 24 #define BD6107_REGVSET_REG1VSET_2_85V (1 << 2) 25 #define BD6107_REGVSET_REG1VSET_2_80V (0 << 2) 26 #define BD6107_LEDCNT1 0x03 27 #define BD6107_LEDCNT1_LEDONOFF2 (1 << 1) 28 #define BD6107_LEDCNT1_LEDONOFF1 (1 << 0) 29 #define BD6107_PORTSEL 0x04 30 #define BD6107_PORTSEL_LEDM(n) (1 << (n)) 31 #define BD6107_RGB1CNT1 0x05 32 #define BD6107_RGB1CNT2 0x06 33 #define BD6107_RGB1CNT3 0x07 34 #define BD6107_RGB1CNT4 0x08 35 #define BD6107_RGB1CNT5 0x09 36 #define BD6107_RGB1FLM 0x0a 37 #define BD6107_RGB2CNT1 0x0b 38 #define BD6107_RGB2CNT2 0x0c 39 #define BD6107_RGB2CNT3 0x0d 40 #define BD6107_RGB2CNT4 0x0e 41 #define BD6107_RGB2CNT5 0x0f 42 #define BD6107_RGB2FLM 0x10 43 #define BD6107_PSCONT3 0x11 44 #define BD6107_SMMONCNT 0x12 45 #define BD6107_DCDCCNT 0x13 46 #define BD6107_IOSEL 0x14 47 #define BD6107_OUT1 0x15 48 #define BD6107_OUT2 0x16 49 #define BD6107_MASK1 0x17 50 #define BD6107_MASK2 0x18 51 #define BD6107_FACTOR1 0x19 52 #define BD6107_FACTOR2 0x1a 53 #define BD6107_CLRFACT1 0x1b 54 #define BD6107_CLRFACT2 0x1c 55 #define BD6107_STATE1 0x1d 56 #define BD6107_LSIVER 0x1e 57 #define BD6107_GRPSEL 0x1f 58 #define BD6107_LEDCNT2 0x20 59 #define BD6107_LEDCNT3 0x21 60 #define BD6107_MCURRENT 0x22 61 #define BD6107_MAINCNT1 0x23 62 #define BD6107_MAINCNT2 0x24 63 #define BD6107_SLOPECNT 0x25 64 #define BD6107_MSLOPE 0x26 65 #define BD6107_RGBSLOPE 0x27 66 #define BD6107_TEST 0x29 67 #define BD6107_SFTRST 0x2a 68 #define BD6107_SFTRSTGD 0x2b 69 70 struct bd6107 { 71 struct i2c_client *client; 72 struct backlight_device *backlight; 73 struct bd6107_platform_data *pdata; 74 }; 75 76 static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data) 77 { 78 return i2c_smbus_write_byte_data(bd->client, reg, data); 79 } 80 81 static int bd6107_backlight_update_status(struct backlight_device *backlight) 82 { 83 struct bd6107 *bd = bl_get_data(backlight); 84 int brightness = backlight->props.brightness; 85 86 if (backlight->props.power != FB_BLANK_UNBLANK || 87 backlight->props.fb_blank != FB_BLANK_UNBLANK || 88 backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) 89 brightness = 0; 90 91 if (brightness) { 92 bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) | 93 BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0)); 94 bd6107_write(bd, BD6107_MAINCNT1, brightness); 95 bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1); 96 } else { 97 gpio_set_value(bd->pdata->reset, 0); 98 msleep(24); 99 gpio_set_value(bd->pdata->reset, 1); 100 } 101 102 return 0; 103 } 104 105 static int bd6107_backlight_check_fb(struct backlight_device *backlight, 106 struct fb_info *info) 107 { 108 struct bd6107 *bd = bl_get_data(backlight); 109 110 return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev; 111 } 112 113 static const struct backlight_ops bd6107_backlight_ops = { 114 .options = BL_CORE_SUSPENDRESUME, 115 .update_status = bd6107_backlight_update_status, 116 .check_fb = bd6107_backlight_check_fb, 117 }; 118 119 static int bd6107_probe(struct i2c_client *client, 120 const struct i2c_device_id *id) 121 { 122 struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev); 123 struct backlight_device *backlight; 124 struct backlight_properties props; 125 struct bd6107 *bd; 126 int ret; 127 128 if (pdata == NULL || !pdata->reset) { 129 dev_err(&client->dev, "No reset GPIO in platform data\n"); 130 return -EINVAL; 131 } 132 133 if (!i2c_check_functionality(client->adapter, 134 I2C_FUNC_SMBUS_BYTE_DATA)) { 135 dev_warn(&client->dev, 136 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); 137 return -EIO; 138 } 139 140 bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL); 141 if (!bd) 142 return -ENOMEM; 143 144 bd->client = client; 145 bd->pdata = pdata; 146 147 ret = devm_gpio_request_one(&client->dev, pdata->reset, 148 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset"); 149 if (ret < 0) { 150 dev_err(&client->dev, "unable to request reset GPIO\n"); 151 return ret; 152 } 153 154 memset(&props, 0, sizeof(props)); 155 props.type = BACKLIGHT_RAW; 156 props.max_brightness = 128; 157 props.brightness = clamp_t(unsigned int, pdata->def_value, 0, 158 props.max_brightness); 159 160 backlight = devm_backlight_device_register(&client->dev, 161 dev_name(&client->dev), 162 &bd->client->dev, bd, 163 &bd6107_backlight_ops, &props); 164 if (IS_ERR(backlight)) { 165 dev_err(&client->dev, "failed to register backlight\n"); 166 return PTR_ERR(backlight); 167 } 168 169 backlight_update_status(backlight); 170 i2c_set_clientdata(client, backlight); 171 172 return 0; 173 } 174 175 static int bd6107_remove(struct i2c_client *client) 176 { 177 struct backlight_device *backlight = i2c_get_clientdata(client); 178 179 backlight->props.brightness = 0; 180 backlight_update_status(backlight); 181 182 return 0; 183 } 184 185 static const struct i2c_device_id bd6107_ids[] = { 186 { "bd6107", 0 }, 187 { } 188 }; 189 MODULE_DEVICE_TABLE(i2c, bd6107_ids); 190 191 static struct i2c_driver bd6107_driver = { 192 .driver = { 193 .name = "bd6107", 194 }, 195 .probe = bd6107_probe, 196 .remove = bd6107_remove, 197 .id_table = bd6107_ids, 198 }; 199 200 module_i2c_driver(bd6107_driver); 201 202 MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver"); 203 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); 204 MODULE_LICENSE("GPL"); 205