diff options
Diffstat (limited to 'drivers/video/backlight/bd6107.c')
| -rw-r--r-- | drivers/video/backlight/bd6107.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c new file mode 100644 index 000000000000..15e3294b29fe --- /dev/null +++ b/drivers/video/backlight/bd6107.c @@ -0,0 +1,213 @@ +/* + * ROHM Semiconductor BD6107 LED Driver + * + * Copyright (C) 2013 Ideas on board SPRL + * + * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/fb.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/platform_data/bd6107.h> +#include <linux/slab.h> + +#define BD6107_PSCNT1 0x00 +#define BD6107_PSCNT1_PSCNTREG2 (1 << 2) +#define BD6107_PSCNT1_PSCNTREG1 (1 << 0) +#define BD6107_REGVSET 0x02 +#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2) +#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2) +#define BD6107_LEDCNT1 0x03 +#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1) +#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0) +#define BD6107_PORTSEL 0x04 +#define BD6107_PORTSEL_LEDM(n) (1 << (n)) +#define BD6107_RGB1CNT1 0x05 +#define BD6107_RGB1CNT2 0x06 +#define BD6107_RGB1CNT3 0x07 +#define BD6107_RGB1CNT4 0x08 +#define BD6107_RGB1CNT5 0x09 +#define BD6107_RGB1FLM 0x0a +#define BD6107_RGB2CNT1 0x0b +#define BD6107_RGB2CNT2 0x0c +#define BD6107_RGB2CNT3 0x0d +#define BD6107_RGB2CNT4 0x0e +#define BD6107_RGB2CNT5 0x0f +#define BD6107_RGB2FLM 0x10 +#define BD6107_PSCONT3 0x11 +#define BD6107_SMMONCNT 0x12 +#define BD6107_DCDCCNT 0x13 +#define BD6107_IOSEL 0x14 +#define BD6107_OUT1 0x15 +#define BD6107_OUT2 0x16 +#define BD6107_MASK1 0x17 +#define BD6107_MASK2 0x18 +#define BD6107_FACTOR1 0x19 +#define BD6107_FACTOR2 0x1a +#define BD6107_CLRFACT1 0x1b +#define BD6107_CLRFACT2 0x1c +#define BD6107_STATE1 0x1d +#define BD6107_LSIVER 0x1e +#define BD6107_GRPSEL 0x1f +#define BD6107_LEDCNT2 0x20 +#define BD6107_LEDCNT3 0x21 +#define BD6107_MCURRENT 0x22 +#define BD6107_MAINCNT1 0x23 +#define BD6107_MAINCNT2 0x24 +#define BD6107_SLOPECNT 0x25 +#define BD6107_MSLOPE 0x26 +#define BD6107_RGBSLOPE 0x27 +#define BD6107_TEST 0x29 +#define BD6107_SFTRST 0x2a +#define BD6107_SFTRSTGD 0x2b + +struct bd6107 { + struct i2c_client *client; + struct backlight_device *backlight; + struct bd6107_platform_data *pdata; +}; + +static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data) +{ + return i2c_smbus_write_byte_data(bd->client, reg, data); +} + +static int bd6107_backlight_update_status(struct backlight_device *backlight) +{ + struct bd6107 *bd = bl_get_data(backlight); + int brightness = backlight->props.brightness; + + if (backlight->props.power != FB_BLANK_UNBLANK || + backlight->props.fb_blank != FB_BLANK_UNBLANK || + backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) + brightness = 0; + + if (brightness) { + bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) | + BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0)); + bd6107_write(bd, BD6107_MAINCNT1, brightness); + bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1); + } else { + gpio_set_value(bd->pdata->reset, 0); + msleep(24); + gpio_set_value(bd->pdata->reset, 1); + } + + return 0; +} + +static int bd6107_backlight_get_brightness(struct backlight_device *backlight) +{ + return backlight->props.brightness; +} + +static int bd6107_backlight_check_fb(struct backlight_device *backlight, + struct fb_info *info) +{ + struct bd6107 *bd = bl_get_data(backlight); + + return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev; +} + +static const struct backlight_ops bd6107_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = bd6107_backlight_update_status, + .get_brightness = bd6107_backlight_get_brightness, + .check_fb = bd6107_backlight_check_fb, +}; + +static int bd6107_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct bd6107_platform_data *pdata = client->dev.platform_data; + struct backlight_device *backlight; + struct backlight_properties props; + struct bd6107 *bd; + int ret; + + if (pdata == NULL || !pdata->reset) { + dev_err(&client->dev, "No reset GPIO in platform data\n"); + return -EINVAL; + } + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_warn(&client->dev, + "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); + return -EIO; + } + + bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL); + if (!bd) + return -ENOMEM; + + bd->client = client; + bd->pdata = pdata; + + ret = devm_gpio_request_one(&client->dev, pdata->reset, + GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset"); + if (ret < 0) { + dev_err(&client->dev, "unable to request reset GPIO\n"); + return ret; + } + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = 128; + props.brightness = clamp_t(unsigned int, pdata->def_value, 0, + props.max_brightness); + + backlight = backlight_device_register(dev_name(&client->dev), + &bd->client->dev, bd, + &bd6107_backlight_ops, &props); + if (IS_ERR(backlight)) { + dev_err(&client->dev, "failed to register backlight\n"); + return PTR_ERR(backlight); + } + + backlight_update_status(backlight); + i2c_set_clientdata(client, backlight); + + return 0; +} + +static int bd6107_remove(struct i2c_client *client) +{ + struct backlight_device *backlight = i2c_get_clientdata(client); + + backlight->props.brightness = 0; + backlight_update_status(backlight); + backlight_device_unregister(backlight); + + return 0; +} + +static const struct i2c_device_id bd6107_ids[] = { + { "bd6107", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, bd6107_ids); + +static struct i2c_driver bd6107_driver = { + .driver = { + .name = "bd6107", + }, + .probe = bd6107_probe, + .remove = bd6107_remove, + .id_table = bd6107_ids, +}; + +module_i2c_driver(bd6107_driver); + +MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver"); +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_LICENSE("GPL"); |