projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 67b43e59 LP |
1 | /* |
| 2 | * ROHM Semiconductor BD6107 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/delay.h> | |
| 15 | #include <linux/err.h> | |
| 16 | #include <linux/fb.h> | |
| 17 | #include <linux/gpio.h> | |
| 18 | #include <linux/i2c.h> | |
| 19 | #include <linux/module.h> | |
| 20 | #include <linux/platform_data/bd6107.h> | |
| 21 | #include <linux/slab.h> | |
| 22 | ||
| 23 | #define BD6107_PSCNT1 0x00 | |
| 24 | #define BD6107_PSCNT1_PSCNTREG2 (1 << 2) | |
| 25 | #define BD6107_PSCNT1_PSCNTREG1 (1 << 0) | |
| 26 | #define BD6107_REGVSET 0x02 | |
| 27 | #define BD6107_REGVSET_REG1VSET_2_85V (1 << 2) | |
| 28 | #define BD6107_REGVSET_REG1VSET_2_80V (0 << 2) | |
| 29 | #define BD6107_LEDCNT1 0x03 | |
| 30 | #define BD6107_LEDCNT1_LEDONOFF2 (1 << 1) | |
| 31 | #define BD6107_LEDCNT1_LEDONOFF1 (1 << 0) | |
| 32 | #define BD6107_PORTSEL 0x04 | |
| 33 | #define BD6107_PORTSEL_LEDM(n) (1 << (n)) | |
| 34 | #define BD6107_RGB1CNT1 0x05 | |
| 35 | #define BD6107_RGB1CNT2 0x06 | |
| 36 | #define BD6107_RGB1CNT3 0x07 | |
| 37 | #define BD6107_RGB1CNT4 0x08 | |
| 38 | #define BD6107_RGB1CNT5 0x09 | |
| 39 | #define BD6107_RGB1FLM 0x0a | |
| 40 | #define BD6107_RGB2CNT1 0x0b | |
| 41 | #define BD6107_RGB2CNT2 0x0c | |
| 42 | #define BD6107_RGB2CNT3 0x0d | |
| 43 | #define BD6107_RGB2CNT4 0x0e | |
| 44 | #define BD6107_RGB2CNT5 0x0f | |
| 45 | #define BD6107_RGB2FLM 0x10 | |
| 46 | #define BD6107_PSCONT3 0x11 | |
| 47 | #define BD6107_SMMONCNT 0x12 | |
| 48 | #define BD6107_DCDCCNT 0x13 | |
| 49 | #define BD6107_IOSEL 0x14 | |
| 50 | #define BD6107_OUT1 0x15 | |
| 51 | #define BD6107_OUT2 0x16 | |
| 52 | #define BD6107_MASK1 0x17 | |
| 53 | #define BD6107_MASK2 0x18 | |
| 54 | #define BD6107_FACTOR1 0x19 | |
| 55 | #define BD6107_FACTOR2 0x1a | |
| 56 | #define BD6107_CLRFACT1 0x1b | |
| 57 | #define BD6107_CLRFACT2 0x1c | |
| 58 | #define BD6107_STATE1 0x1d | |
| 59 | #define BD6107_LSIVER 0x1e | |
| 60 | #define BD6107_GRPSEL 0x1f | |
| 61 | #define BD6107_LEDCNT2 0x20 | |
| 62 | #define BD6107_LEDCNT3 0x21 | |
| 63 | #define BD6107_MCURRENT 0x22 | |
| 64 | #define BD6107_MAINCNT1 0x23 | |
| 65 | #define BD6107_MAINCNT2 0x24 | |
| 66 | #define BD6107_SLOPECNT 0x25 | |
| 67 | #define BD6107_MSLOPE 0x26 | |
| 68 | #define BD6107_RGBSLOPE 0x27 | |
| 69 | #define BD6107_TEST 0x29 | |
| 70 | #define BD6107_SFTRST 0x2a | |
| 71 | #define BD6107_SFTRSTGD 0x2b | |
| 72 | ||
| 73 | struct bd6107 { | |
| 74 | struct i2c_client *client; | |
| 75 | struct backlight_device *backlight; | |
| 76 | struct bd6107_platform_data *pdata; | |
| 77 | }; | |
| 78 | ||
| 79 | static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data) | |
| 80 | { | |
| 81 | return i2c_smbus_write_byte_data(bd->client, reg, data); | |
| 82 | } | |
| 83 | ||
| 84 | static int bd6107_backlight_update_status(struct backlight_device *backlight) | |
| 85 | { | |
| 86 | struct bd6107 *bd = bl_get_data(backlight); | |
| 87 | int brightness = backlight->props.brightness; | |
| 88 | ||
| 89 | if (backlight->props.power != FB_BLANK_UNBLANK || | |
| 90 | backlight->props.fb_blank != FB_BLANK_UNBLANK || | |
| 91 | backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) | |
| 92 | brightness = 0; | |
| 93 | ||
| 94 | if (brightness) { | |
| 95 | bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) | | |
| 96 | BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0)); | |
| 97 | bd6107_write(bd, BD6107_MAINCNT1, brightness); | |
| 98 | bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1); | |
| 99 | } else { | |
| 100 | gpio_set_value(bd->pdata->reset, 0); | |
| 101 | msleep(24); | |
| 102 | gpio_set_value(bd->pdata->reset, 1); | |
| 103 | } | |
| 104 | ||
| 105 | return 0; | |
| 106 | } | |
| 107 | ||
| 108 | static int bd6107_backlight_get_brightness(struct backlight_device *backlight) | |
| 109 | { | |
| 110 | return backlight->props.brightness; | |
| 111 | } | |
| 112 | ||
| 113 | static int bd6107_backlight_check_fb(struct backlight_device *backlight, | |
| 114 | struct fb_info *info) | |
| 115 | { | |
| 116 | struct bd6107 *bd = bl_get_data(backlight); | |
| 117 | ||
| 118 | return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev; | |
| 119 | } | |
| 120 | ||
| 121 | static const struct backlight_ops bd6107_backlight_ops = { | |
| 122 | .options = BL_CORE_SUSPENDRESUME, | |
| 123 | .update_status = bd6107_backlight_update_status, | |
| 124 | .get_brightness = bd6107_backlight_get_brightness, | |
| 125 | .check_fb = bd6107_backlight_check_fb, | |
| 126 | }; | |
| 127 | ||
| 128 | static int bd6107_probe(struct i2c_client *client, | |
| 129 | const struct i2c_device_id *id) | |
| 130 | { | |
| c512794c | 131 | struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev); |
| 67b43e59 LP |
132 | struct backlight_device *backlight; |
| 133 | struct backlight_properties props; | |
| 134 | struct bd6107 *bd; | |
| 135 | int ret; | |
| 136 | ||
| 137 | if (pdata == NULL || !pdata->reset) { | |
| 138 | dev_err(&client->dev, "No reset GPIO in platform data\n"); | |
| 139 | return -EINVAL; | |
| 140 | } | |
| 141 | ||
| 142 | if (!i2c_check_functionality(client->adapter, | |
| 143 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
| 144 | dev_warn(&client->dev, | |
| 145 | "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); | |
| 146 | return -EIO; | |
| 147 | } | |
| 148 | ||
| 149 | bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL); | |
| 150 | if (!bd) | |
| 151 | return -ENOMEM; | |
| 152 | ||
| 153 | bd->client = client; | |
| 154 | bd->pdata = pdata; | |
| 155 | ||
| 156 | ret = devm_gpio_request_one(&client->dev, pdata->reset, | |
| 157 | GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset"); | |
| 158 | if (ret < 0) { | |
| 159 | dev_err(&client->dev, "unable to request reset GPIO\n"); | |
| 160 | return ret; | |
| 161 | } | |
| 162 | ||
| 163 | memset(&props, 0, sizeof(props)); | |
| 164 | props.type = BACKLIGHT_RAW; | |
| 165 | props.max_brightness = 128; | |
| 166 | props.brightness = clamp_t(unsigned int, pdata->def_value, 0, | |
| 167 | props.max_brightness); | |
| 168 | ||
| 26faf15c JH |
169 | backlight = devm_backlight_device_register(&client->dev, |
| 170 | dev_name(&client->dev), | |
| 67b43e59 LP |
171 | &bd->client->dev, bd, |
| 172 | &bd6107_backlight_ops, &props); | |
| 173 | if (IS_ERR(backlight)) { | |
| 174 | dev_err(&client->dev, "failed to register backlight\n"); | |
| 175 | return PTR_ERR(backlight); | |
| 176 | } | |
| 177 | ||
| 178 | backlight_update_status(backlight); | |
| 179 | i2c_set_clientdata(client, backlight); | |
| 180 | ||
| 181 | return 0; | |
| 182 | } | |
| 183 | ||
| 184 | static int bd6107_remove(struct i2c_client *client) | |
| 185 | { | |
| 186 | struct backlight_device *backlight = i2c_get_clientdata(client); | |
| 187 | ||
| 188 | backlight->props.brightness = 0; | |
| 189 | backlight_update_status(backlight); | |
| 67b43e59 LP |
190 | |
| 191 | return 0; | |
| 192 | } | |
| 193 | ||
| 194 | static const struct i2c_device_id bd6107_ids[] = { | |
| 195 | { "bd6107", 0 }, | |
| 196 | { } | |
| 197 | }; | |
| 198 | MODULE_DEVICE_TABLE(i2c, bd6107_ids); | |
| 199 | ||
| 200 | static struct i2c_driver bd6107_driver = { | |
| 201 | .driver = { | |
| 202 | .name = "bd6107", | |
| 203 | }, | |
| 204 | .probe = bd6107_probe, | |
| 205 | .remove = bd6107_remove, | |
| 206 | .id_table = bd6107_ids, | |
| 207 | }; | |
| 208 | ||
| 209 | module_i2c_driver(bd6107_driver); | |
| 210 | ||
| 211 | MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver"); | |
| 212 | MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); | |
| 213 | MODULE_LICENSE("GPL"); |