304 lines
6.6 KiB
C
304 lines
6.6 KiB
C
/* drivers/video/backlight/ili9320.c
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*
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* ILI9320 LCD controller driver core.
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*
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* Copyright 2007 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/lcd.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <video/ili9320.h>
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#include "ili9320.h"
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static inline int ili9320_write_spi(struct ili9320 *ili,
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unsigned int reg,
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unsigned int value)
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{
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struct ili9320_spi *spi = &ili->access.spi;
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unsigned char *addr = spi->buffer_addr;
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unsigned char *data = spi->buffer_data;
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/* spi message consits of:
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* first byte: ID and operation
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*/
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addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
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addr[1] = reg >> 8;
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addr[2] = reg;
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/* second message is the data to transfer */
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data[0] = spi->id | ILI9320_SPI_DATA | ILI9320_SPI_WRITE;
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data[1] = value >> 8;
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data[2] = value;
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return spi_sync(spi->dev, &spi->message);
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}
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int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
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{
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dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
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return ili->write(ili, reg, value);
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}
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EXPORT_SYMBOL_GPL(ili9320_write);
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int ili9320_write_regs(struct ili9320 *ili,
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const struct ili9320_reg *values,
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int nr_values)
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{
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int index;
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int ret;
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for (index = 0; index < nr_values; index++, values++) {
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ret = ili9320_write(ili, values->address, values->value);
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if (ret != 0)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(ili9320_write_regs);
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static void ili9320_reset(struct ili9320 *lcd)
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{
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struct ili9320_platdata *cfg = lcd->platdata;
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cfg->reset(1);
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mdelay(50);
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cfg->reset(0);
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mdelay(50);
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cfg->reset(1);
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mdelay(100);
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}
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static inline int ili9320_init_chip(struct ili9320 *lcd)
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{
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int ret;
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ili9320_reset(lcd);
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ret = lcd->client->init(lcd, lcd->platdata);
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if (ret != 0) {
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dev_err(lcd->dev, "failed to initialise display\n");
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return ret;
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}
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lcd->initialised = 1;
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return 0;
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}
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static inline int ili9320_power_on(struct ili9320 *lcd)
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{
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if (!lcd->initialised)
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ili9320_init_chip(lcd);
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lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
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ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
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return 0;
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}
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static inline int ili9320_power_off(struct ili9320 *lcd)
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{
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lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
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ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
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return 0;
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}
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#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
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static int ili9320_power(struct ili9320 *lcd, int power)
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{
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int ret = 0;
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dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);
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if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
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ret = ili9320_power_on(lcd);
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else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
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ret = ili9320_power_off(lcd);
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if (ret == 0)
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lcd->power = power;
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else
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dev_warn(lcd->dev, "failed to set power mode %d\n", power);
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return ret;
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}
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static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
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{
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return lcd_get_data(lcd);
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}
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static int ili9320_set_power(struct lcd_device *ld, int power)
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{
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struct ili9320 *lcd = to_our_lcd(ld);
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return ili9320_power(lcd, power);
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}
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static int ili9320_get_power(struct lcd_device *ld)
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{
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struct ili9320 *lcd = to_our_lcd(ld);
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return lcd->power;
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}
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static struct lcd_ops ili9320_ops = {
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.get_power = ili9320_get_power,
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.set_power = ili9320_set_power,
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};
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static void ili9320_setup_spi(struct ili9320 *ili,
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struct spi_device *dev)
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{
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struct ili9320_spi *spi = &ili->access.spi;
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ili->write = ili9320_write_spi;
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spi->dev = dev;
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/* fill the two messages we are going to use to send the data
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* with, the first the address followed by the data. The datasheet
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* says they should be done as two distinct cycles of the SPI CS line.
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*/
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spi->xfer[0].tx_buf = spi->buffer_addr;
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spi->xfer[1].tx_buf = spi->buffer_data;
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spi->xfer[0].len = 3;
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spi->xfer[1].len = 3;
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spi->xfer[0].bits_per_word = 8;
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spi->xfer[1].bits_per_word = 8;
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spi->xfer[0].cs_change = 1;
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spi_message_init(&spi->message);
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spi_message_add_tail(&spi->xfer[0], &spi->message);
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spi_message_add_tail(&spi->xfer[1], &spi->message);
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}
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int ili9320_probe_spi(struct spi_device *spi,
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struct ili9320_client *client)
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{
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struct ili9320_platdata *cfg = dev_get_platdata(&spi->dev);
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struct device *dev = &spi->dev;
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struct ili9320 *ili;
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struct lcd_device *lcd;
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int ret = 0;
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/* verify we where given some information */
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if (cfg == NULL) {
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dev_err(dev, "no platform data supplied\n");
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return -EINVAL;
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}
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if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
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dev_err(dev, "invalid platform data supplied\n");
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return -EINVAL;
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}
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/* allocate and initialse our state */
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ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);
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if (ili == NULL)
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return -ENOMEM;
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ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);
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ili->dev = dev;
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ili->client = client;
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ili->power = FB_BLANK_POWERDOWN;
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ili->platdata = cfg;
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spi_set_drvdata(spi, ili);
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ili9320_setup_spi(ili, spi);
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lcd = devm_lcd_device_register(&spi->dev, "ili9320", dev, ili,
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&ili9320_ops);
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if (IS_ERR(lcd)) {
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dev_err(dev, "failed to register lcd device\n");
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return PTR_ERR(lcd);
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}
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ili->lcd = lcd;
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dev_info(dev, "initialising %s\n", client->name);
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ret = ili9320_power(ili, FB_BLANK_UNBLANK);
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if (ret != 0) {
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dev_err(dev, "failed to set lcd power state\n");
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(ili9320_probe_spi);
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int ili9320_remove(struct ili9320 *ili)
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{
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ili9320_power(ili, FB_BLANK_POWERDOWN);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ili9320_remove);
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#ifdef CONFIG_PM_SLEEP
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int ili9320_suspend(struct ili9320 *lcd)
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{
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int ret;
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ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);
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if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
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ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
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ILI9320_POWER1_SLP |
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ILI9320_POWER1_DSTB);
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lcd->initialised = 0;
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(ili9320_suspend);
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int ili9320_resume(struct ili9320 *lcd)
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{
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dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);
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if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)
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ili9320_write(lcd, ILI9320_POWER1, 0x00);
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return ili9320_power(lcd, FB_BLANK_UNBLANK);
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}
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EXPORT_SYMBOL_GPL(ili9320_resume);
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#endif
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/* Power down all displays on reboot, poweroff or halt */
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void ili9320_shutdown(struct ili9320 *lcd)
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{
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ili9320_power(lcd, FB_BLANK_POWERDOWN);
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}
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EXPORT_SYMBOL_GPL(ili9320_shutdown);
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MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
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MODULE_DESCRIPTION("ILI9320 LCD Driver");
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MODULE_LICENSE("GPL v2");
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