| /* |
| * 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/slab.h> |
| #include <linux/gpio.h> |
| #include <linux/lcd.h> |
| |
| #include <linux/spi/spi.h> |
| #include <linux/spi/lms283gf05.h> |
| #include <linux/module.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 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(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, |
| 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; |
| struct lms283gf05_pdata *pdata = spi->dev.platform_data; |
| |
| if (power <= FB_BLANK_NORMAL) { |
| 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 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 = devm_gpio_request_one(&spi->dev, pdata->reset_gpio, |
| GPIOF_DIR_OUT | (!pdata->reset_inverted ? |
| GPIOF_INIT_HIGH : GPIOF_INIT_LOW), |
| "LMS285GF05 RESET"); |
| if (ret) |
| return ret; |
| } |
| |
| st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state), |
| GFP_KERNEL); |
| if (st == NULL) { |
| dev_err(&spi->dev, "No memory for device state\n"); |
| return -ENOMEM; |
| } |
| |
| ld = lcd_device_register("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 (pdata) |
| lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); |
| lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); |
| |
| return 0; |
| } |
| |
| static int lms283gf05_remove(struct spi_device *spi) |
| { |
| struct lms283gf05_state *st = spi_get_drvdata(spi); |
| |
| lcd_device_unregister(st->ld); |
| |
| return 0; |
| } |
| |
| static struct spi_driver lms283gf05_driver = { |
| .driver = { |
| .name = "lms283gf05", |
| .owner = THIS_MODULE, |
| }, |
| .probe = lms283gf05_probe, |
| .remove = lms283gf05_remove, |
| }; |
| |
| module_spi_driver(lms283gf05_driver); |
| |
| MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); |
| MODULE_DESCRIPTION("LCD283GF05 LCD"); |
| MODULE_LICENSE("GPL v2"); |