diff options
Diffstat (limited to 'drivers/video/backlight/tosa_bl.c')
| -rw-r--r-- | drivers/video/backlight/tosa_bl.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/drivers/video/backlight/tosa_bl.c b/drivers/video/backlight/tosa_bl.c new file mode 100644 index 000000000..6df6fcd13 --- /dev/null +++ b/drivers/video/backlight/tosa_bl.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * LCD / Backlight control code for Sharp SL-6000x (tosa) + * + * Copyright (c) 2005 Dirk Opfer + * Copyright (c) 2007,2008 Dmitry Baryshkov + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/spi/spi.h> +#include <linux/i2c.h> +#include <linux/gpio/consumer.h> +#include <linux/fb.h> +#include <linux/backlight.h> +#include <linux/slab.h> + +#include <asm/mach/sharpsl_param.h> + +#include "tosa_bl.h" + +#define COMADJ_DEFAULT 97 + +#define DAC_CH1 0 +#define DAC_CH2 1 + +struct tosa_bl_data { + struct i2c_client *i2c; + struct backlight_device *bl; + struct gpio_desc *gpio; + + int comadj; +}; + +static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness) +{ + struct spi_device *spi = dev_get_platdata(&data->i2c->dev); + + i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj); + + /* SetBacklightDuty */ + i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff)); + + /* SetBacklightVR */ + gpiod_set_value(data->gpio, brightness & 0x100); + + tosa_bl_enable(spi, brightness); +} + +static int tosa_bl_update_status(struct backlight_device *dev) +{ + struct backlight_properties *props = &dev->props; + struct tosa_bl_data *data = bl_get_data(dev); + int power = max(props->power, props->fb_blank); + int brightness = props->brightness; + + if (power) + brightness = 0; + + tosa_bl_set_backlight(data, brightness); + + return 0; +} + +static int tosa_bl_get_brightness(struct backlight_device *dev) +{ + struct backlight_properties *props = &dev->props; + + return props->brightness; +} + +static const struct backlight_ops bl_ops = { + .get_brightness = tosa_bl_get_brightness, + .update_status = tosa_bl_update_status, +}; + +static int tosa_bl_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct backlight_properties props; + struct tosa_bl_data *data; + int ret = 0; + + data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj; + data->gpio = devm_gpiod_get(&client->dev, "backlight", GPIOD_OUT_LOW); + ret = PTR_ERR_OR_ZERO(data->gpio); + if (ret) { + dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); + return ret; + } + + i2c_set_clientdata(client, data); + data->i2c = client; + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.max_brightness = 512 - 1; + data->bl = devm_backlight_device_register(&client->dev, "tosa-bl", + &client->dev, data, &bl_ops, + &props); + if (IS_ERR(data->bl)) { + ret = PTR_ERR(data->bl); + goto err_reg; + } + + data->bl->props.brightness = 69; + data->bl->props.power = FB_BLANK_UNBLANK; + + backlight_update_status(data->bl); + + return 0; + +err_reg: + data->bl = NULL; + return ret; +} + +static int tosa_bl_remove(struct i2c_client *client) +{ + struct tosa_bl_data *data = i2c_get_clientdata(client); + + data->bl = NULL; + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tosa_bl_suspend(struct device *dev) +{ + struct tosa_bl_data *data = dev_get_drvdata(dev); + + tosa_bl_set_backlight(data, 0); + + return 0; +} + +static int tosa_bl_resume(struct device *dev) +{ + struct tosa_bl_data *data = dev_get_drvdata(dev); + + backlight_update_status(data->bl); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume); + +static const struct i2c_device_id tosa_bl_id[] = { + { "tosa-bl", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, tosa_bl_id); + +static struct i2c_driver tosa_bl_driver = { + .driver = { + .name = "tosa-bl", + .pm = &tosa_bl_pm_ops, + }, + .probe = tosa_bl_probe, + .remove = tosa_bl_remove, + .id_table = tosa_bl_id, +}; + +module_i2c_driver(tosa_bl_driver); + +MODULE_AUTHOR("Dmitry Baryshkov"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); + |