diff options
Diffstat (limited to 'drivers/video/backlight/lms283gf05.c')
| -rw-r--r-- | drivers/video/backlight/lms283gf05.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/drivers/video/backlight/lms283gf05.c b/drivers/video/backlight/lms283gf05.c new file mode 100644 index 0000000000..36856962ed --- /dev/null +++ b/drivers/video/backlight/lms283gf05.c @@ -0,0 +1,191 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * lms283gf05.c -- support for Samsung LMS283GF05 LCD + * + * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com> + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/gpio/consumer.h> +#include <linux/lcd.h> + +#include <linux/spi/spi.h> +#include <linux/module.h> + +struct lms283gf05_state { + struct spi_device *spi; + struct lcd_device *ld; + struct gpio_desc *reset; +}; + +struct lms283gf05_seq { + unsigned char reg; + unsigned short value; + unsigned char delay; +}; + +/* Magic sequences supplied by manufacturer, for details refer to datasheet */ +static const struct lms283gf05_seq disp_initseq[] = { + /* REG, VALUE, DELAY */ + { 0x07, 0x0000, 0 }, + { 0x13, 0x0000, 10 }, + + { 0x11, 0x3004, 0 }, + { 0x14, 0x200F, 0 }, + { 0x10, 0x1a20, 0 }, + { 0x13, 0x0040, 50 }, + + { 0x13, 0x0060, 0 }, + { 0x13, 0x0070, 200 }, + + { 0x01, 0x0127, 0 }, + { 0x02, 0x0700, 0 }, + { 0x03, 0x1030, 0 }, + { 0x08, 0x0208, 0 }, + { 0x0B, 0x0620, 0 }, + { 0x0C, 0x0110, 0 }, + { 0x30, 0x0120, 0 }, + { 0x31, 0x0127, 0 }, + { 0x32, 0x0000, 0 }, + { 0x33, 0x0503, 0 }, + { 0x34, 0x0727, 0 }, + { 0x35, 0x0124, 0 }, + { 0x36, 0x0706, 0 }, + { 0x37, 0x0701, 0 }, + { 0x38, 0x0F00, 0 }, + { 0x39, 0x0F00, 0 }, + { 0x40, 0x0000, 0 }, + { 0x41, 0x0000, 0 }, + { 0x42, 0x013f, 0 }, + { 0x43, 0x0000, 0 }, + { 0x44, 0x013f, 0 }, + { 0x45, 0x0000, 0 }, + { 0x46, 0xef00, 0 }, + { 0x47, 0x013f, 0 }, + { 0x48, 0x0000, 0 }, + { 0x07, 0x0015, 30 }, + + { 0x07, 0x0017, 0 }, + + { 0x20, 0x0000, 0 }, + { 0x21, 0x0000, 0 }, + { 0x22, 0x0000, 0 } +}; + +static const struct lms283gf05_seq disp_pdwnseq[] = { + { 0x07, 0x0016, 30 }, + + { 0x07, 0x0004, 0 }, + { 0x10, 0x0220, 20 }, + + { 0x13, 0x0060, 50 }, + + { 0x13, 0x0040, 50 }, + + { 0x13, 0x0000, 0 }, + { 0x10, 0x0000, 0 } +}; + + +static void lms283gf05_reset(struct gpio_desc *gpiod) +{ + gpiod_set_value(gpiod, 0); /* De-asserted */ + mdelay(100); + gpiod_set_value(gpiod, 1); /* Asserted */ + mdelay(20); + gpiod_set_value(gpiod, 0); /* De-asserted */ + mdelay(20); +} + +static void lms283gf05_toggle(struct spi_device *spi, + const struct lms283gf05_seq *seq, int sz) +{ + char buf[3]; + int i; + + for (i = 0; i < sz; i++) { + buf[0] = 0x74; + buf[1] = 0x00; + buf[2] = seq[i].reg; + spi_write(spi, buf, 3); + + buf[0] = 0x76; + buf[1] = seq[i].value >> 8; + buf[2] = seq[i].value & 0xff; + spi_write(spi, buf, 3); + + mdelay(seq[i].delay); + } +} + +static int lms283gf05_power_set(struct lcd_device *ld, int power) +{ + struct lms283gf05_state *st = lcd_get_data(ld); + struct spi_device *spi = st->spi; + + if (power <= FB_BLANK_NORMAL) { + if (st->reset) + lms283gf05_reset(st->reset); + lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); + } else { + lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq)); + if (st->reset) + gpiod_set_value(st->reset, 1); /* Asserted */ + } + + return 0; +} + +static struct lcd_ops lms_ops = { + .set_power = lms283gf05_power_set, + .get_power = NULL, +}; + +static int lms283gf05_probe(struct spi_device *spi) +{ + struct lms283gf05_state *st; + struct lcd_device *ld; + + st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state), + GFP_KERNEL); + if (st == NULL) + return -ENOMEM; + + st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(st->reset)) + return PTR_ERR(st->reset); + gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET"); + + ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st, + &lms_ops); + if (IS_ERR(ld)) + return PTR_ERR(ld); + + st->spi = spi; + st->ld = ld; + + spi_set_drvdata(spi, st); + + /* kick in the LCD */ + if (st->reset) + lms283gf05_reset(st->reset); + lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); + + return 0; +} + +static struct spi_driver lms283gf05_driver = { + .driver = { + .name = "lms283gf05", + }, + .probe = lms283gf05_probe, +}; + +module_spi_driver(lms283gf05_driver); + +MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); +MODULE_DESCRIPTION("LCD283GF05 LCD"); +MODULE_LICENSE("GPL v2"); |