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300 lines
6.5 KiB
300 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("ILI9320 LCD Driver"); |
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MODULE_LICENSE("GPL v2");
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