/* * lms283gf05.c -- support for Samsung LMS283GF05 LCD * * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.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/device.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/gpio.h> #include <linux/lcd.h> #include <linux/spi/spi.h> #include <linux/spi/lms283gf05.h> struct lms283gf05_state { struct spi_device *spi; struct lcd_device *ld; }; struct lms283gf05_seq { unsigned char reg; unsigned short value; unsigned char delay; }; /* Magic sequences supplied by manufacturer, for details refer to datasheet */ static 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 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(unsigned long gpio, bool inverted) { gpio_set_value(gpio, !inverted); mdelay(100); gpio_set_value(gpio, inverted); mdelay(20); gpio_set_value(gpio, !inverted); mdelay(20); } static void lms283gf05_toggle(struct spi_device *spi, 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; struct lms283gf05_pdata *pdata = spi->dev.platform_data; if (power) { if (pdata) lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); } else { lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq)); if (pdata) gpio_set_value(pdata->reset_gpio, pdata->reset_inverted); } return 0; } static struct lcd_ops lms_ops = { .set_power = lms283gf05_power_set, .get_power = NULL, }; static int __devinit lms283gf05_probe(struct spi_device *spi) { struct lms283gf05_state *st; struct lms283gf05_pdata *pdata = spi->dev.platform_data; struct lcd_device *ld; int ret = 0; if (pdata != NULL) { ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET"); if (ret) return ret; ret = gpio_direction_output(pdata->reset_gpio, !pdata->reset_inverted); if (ret) goto err; } st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL); if (st == NULL) { dev_err(&spi->dev, "No memory for device state\n"); ret = -ENOMEM; goto err; } ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops); if (IS_ERR(ld)) { ret = PTR_ERR(ld); goto err2; } st->spi = spi; st->ld = ld; dev_set_drvdata(&spi->dev, st); /* kick in the LCD */ if (pdata) lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); return 0; err2: kfree(st); err: if (pdata != NULL) gpio_free(pdata->reset_gpio); return ret; } static int __devexit lms283gf05_remove(struct spi_device *spi) { struct lms283gf05_state *st = dev_get_drvdata(&spi->dev); struct lms283gf05_pdata *pdata = st->spi->dev.platform_data; lcd_device_unregister(st->ld); if (pdata != NULL) gpio_free(pdata->reset_gpio); kfree(st); return 0; } static struct spi_driver lms283gf05_driver = { .driver = { .name = "lms283gf05", .owner = THIS_MODULE, }, .probe = lms283gf05_probe, .remove = __devexit_p(lms283gf05_remove), }; static __init int lms283gf05_init(void) { return spi_register_driver(&lms283gf05_driver); } static __exit void lms283gf05_exit(void) { spi_unregister_driver(&lms283gf05_driver); } module_init(lms283gf05_init); module_exit(lms283gf05_exit); MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); MODULE_DESCRIPTION("LCD283GF05 LCD"); MODULE_LICENSE("GPL v2");