[linux-2.6-block.git] / drivers / video / backlight / ili9320.c

/* drivers/video/backlight/ili9320.c
 *
 * ILI9320 LCD controller driver core.
 *
 * Copyright 2007 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * 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/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <linux/spi/spi.h>

#include <video/ili9320.h>

#include "ili9320.h"


static inline int ili9320_write_spi(struct ili9320 *ili,
				    unsigned int reg,
				    unsigned int value)
{
	struct ili9320_spi *spi = &ili->access.spi;
	unsigned char *addr = spi->buffer_addr;
	unsigned char *data = spi->buffer_data;

	/* spi message consits of:
	 * first byte: ID and operation
	 */

	addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
	addr[1] = reg >> 8;
	addr[2] = reg;

	/* second message is the data to transfer */

	data[0] = spi->id | ILI9320_SPI_DATA  | ILI9320_SPI_WRITE;
	data[1] = value >> 8;
	data[2] = value;

	return spi_sync(spi->dev, &spi->message);
}

int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
{
	dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
	return ili->write(ili, reg, value);
}
EXPORT_SYMBOL_GPL(ili9320_write);

int ili9320_write_regs(struct ili9320 *ili,
		       const struct ili9320_reg *values,
		       int nr_values)
{
	int index;
	int ret;

	for (index = 0; index < nr_values; index++, values++) {
		ret = ili9320_write(ili, values->address, values->value);
		if (ret != 0)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ili9320_write_regs);

static void ili9320_reset(struct ili9320 *lcd)
{
	struct ili9320_platdata *cfg = lcd->platdata;

	cfg->reset(1);
	mdelay(50);

	cfg->reset(0);
	mdelay(50);

	cfg->reset(1);
	mdelay(100);
}

static inline int ili9320_init_chip(struct ili9320 *lcd)
{
	int ret;

	ili9320_reset(lcd);

	ret = lcd->client->init(lcd, lcd->platdata);
	if (ret != 0) {
		dev_err(lcd->dev, "failed to initialise display\n");
		return ret;
	}

	lcd->initialised = 1;
	return 0;
}

static inline int ili9320_power_on(struct ili9320 *lcd)
{
	if (!lcd->initialised)
		ili9320_init_chip(lcd);

	lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);

	return 0;
}

static inline int ili9320_power_off(struct ili9320 *lcd)
{
	lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);

	return 0;
}

#define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)

static int ili9320_power(struct ili9320 *lcd, int power)
{
	int ret = 0;

	dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);

	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
		ret = ili9320_power_on(lcd);
	else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
		ret = ili9320_power_off(lcd);

	if (ret == 0)
		lcd->power = power;
	else
		dev_warn(lcd->dev, "failed to set power mode %d\n", power);

	return ret;
}

static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
{
	return lcd_get_data(lcd);
}

static int ili9320_set_power(struct lcd_device *ld, int power)
{
	struct ili9320 *lcd = to_our_lcd(ld);

	return ili9320_power(lcd, power);
}

static int ili9320_get_power(struct lcd_device *ld)
{
	struct ili9320 *lcd = to_our_lcd(ld);

	return lcd->power;
}

static struct lcd_ops ili9320_ops = {
	.get_power	= ili9320_get_power,
	.set_power	= ili9320_set_power,
};

static void ili9320_setup_spi(struct ili9320 *ili,
					struct spi_device *dev)
{
	struct ili9320_spi *spi = &ili->access.spi;

	ili->write = ili9320_write_spi;
	spi->dev = dev;

	/* fill the two messages we are going to use to send the data
	 * with, the first the address followed by the data. The datasheet
	 * says they should be done as two distinct cycles of the SPI CS line.
	 */

	spi->xfer[0].tx_buf = spi->buffer_addr;
	spi->xfer[1].tx_buf = spi->buffer_data;
	spi->xfer[0].len = 3;
	spi->xfer[1].len = 3;
	spi->xfer[0].bits_per_word = 8;
	spi->xfer[1].bits_per_word = 8;
	spi->xfer[0].cs_change = 1;

	spi_message_init(&spi->message);
	spi_message_add_tail(&spi->xfer[0], &spi->message);
	spi_message_add_tail(&spi->xfer[1], &spi->message);
}

int ili9320_probe_spi(struct spi_device *spi,
				struct ili9320_client *client)
{
	struct ili9320_platdata *cfg = dev_get_platdata(&spi->dev);
	struct device *dev = &spi->dev;
	struct ili9320 *ili;
	struct lcd_device *lcd;
	int ret = 0;

	/* verify we where given some information */

	if (cfg == NULL) {
		dev_err(dev, "no platform data supplied\n");
		return -EINVAL;
	}

	if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
		dev_err(dev, "invalid platform data supplied\n");
		return -EINVAL;
	}

	/* allocate and initialse our state */

	ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);
	if (ili == NULL)
		return -ENOMEM;

	ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);

	ili->dev = dev;
	ili->client = client;
	ili->power = FB_BLANK_POWERDOWN;
	ili->platdata = cfg;

	spi_set_drvdata(spi, ili);

	ili9320_setup_spi(ili, spi);

	lcd = devm_lcd_device_register(&spi->dev, "ili9320", dev, ili,
					&ili9320_ops);
	if (IS_ERR(lcd)) {
		dev_err(dev, "failed to register lcd device\n");
		return PTR_ERR(lcd);
	}

	ili->lcd = lcd;

	dev_info(dev, "initialising %s\n", client->name);

	ret = ili9320_power(ili, FB_BLANK_UNBLANK);
	if (ret != 0) {
		dev_err(dev, "failed to set lcd power state\n");
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ili9320_probe_spi);

int ili9320_remove(struct ili9320 *ili)
{
	ili9320_power(ili, FB_BLANK_POWERDOWN);
	return 0;
}
EXPORT_SYMBOL_GPL(ili9320_remove);

#ifdef CONFIG_PM_SLEEP
int ili9320_suspend(struct ili9320 *lcd)
{
	int ret;

	ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);

	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
		ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
			      ILI9320_POWER1_SLP |
			      ILI9320_POWER1_DSTB);
		lcd->initialised = 0;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(ili9320_suspend);

int ili9320_resume(struct ili9320 *lcd)
{
	dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);

	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)
		ili9320_write(lcd, ILI9320_POWER1, 0x00);

	return ili9320_power(lcd, FB_BLANK_UNBLANK);
}
EXPORT_SYMBOL_GPL(ili9320_resume);
#endif

/* Power down all displays on reboot, poweroff or halt */
void ili9320_shutdown(struct ili9320 *lcd)
{
	ili9320_power(lcd, FB_BLANK_POWERDOWN);
}
EXPORT_SYMBOL_GPL(ili9320_shutdown);

MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
MODULE_DESCRIPTION("ILI9320 LCD Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
cccb6d3c BD	1	/* drivers/video/backlight/ili9320.c
	2	*
	3	* ILI9320 LCD controller driver core.
	4	*
	5	* Copyright 2007 Simtec Electronics
	6	* http://armlinux.simtec.co.uk/
	7	* Ben Dooks <ben@simtec.co.uk>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/delay.h>
	15	#include <linux/err.h>
	16	#include <linux/fb.h>
	17	#include <linux/init.h>
	18	#include <linux/lcd.h>
	19	#include <linux/module.h>
5a0e3ad6	20	#include <linux/slab.h>
cccb6d3c BD	21
	22	#include <linux/spi/spi.h>
	23
	24	#include <video/ili9320.h>
	25
	26	#include "ili9320.h"
	27
	28
	29	static inline int ili9320_write_spi(struct ili9320 *ili,
	30	unsigned int reg,
	31	unsigned int value)
	32	{
	33	struct ili9320_spi *spi = &ili->access.spi;
	34	unsigned char *addr = spi->buffer_addr;
	35	unsigned char *data = spi->buffer_data;
	36
	37	/* spi message consits of:
	38	* first byte: ID and operation
	39	*/
	40
	41	addr[0] = spi->id \| ILI9320_SPI_INDEX \| ILI9320_SPI_WRITE;
	42	addr[1] = reg >> 8;
	43	addr[2] = reg;
	44
	45	/* second message is the data to transfer */
	46
	47	data[0] = spi->id \| ILI9320_SPI_DATA \| ILI9320_SPI_WRITE;
c0b6cc49	48	data[1] = value >> 8;
cccb6d3c BD	49	data[2] = value;
	50
	51	return spi_sync(spi->dev, &spi->message);
	52	}
	53
	54	int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
	55	{
	56	dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
	57	return ili->write(ili, reg, value);
	58	}
cccb6d3c BD	59	EXPORT_SYMBOL_GPL(ili9320_write);
	60
	61	int ili9320_write_regs(struct ili9320 *ili,
3fd00432	62	const struct ili9320_reg *values,
cccb6d3c BD	63	int nr_values)
	64	{
	65	int index;
	66	int ret;
	67
	68	for (index = 0; index < nr_values; index++, values++) {
	69	ret = ili9320_write(ili, values->address, values->value);
	70	if (ret != 0)
	71	return ret;
	72	}
	73
	74	return 0;
	75	}
cccb6d3c BD	76	EXPORT_SYMBOL_GPL(ili9320_write_regs);
	77
	78	static void ili9320_reset(struct ili9320 *lcd)
	79	{
	80	struct ili9320_platdata *cfg = lcd->platdata;
	81
	82	cfg->reset(1);
	83	mdelay(50);
	84
	85	cfg->reset(0);
	86	mdelay(50);
	87
	88	cfg->reset(1);
	89	mdelay(100);
	90	}
	91
	92	static inline int ili9320_init_chip(struct ili9320 *lcd)
	93	{
	94	int ret;
	95
	96	ili9320_reset(lcd);
	97
	98	ret = lcd->client->init(lcd, lcd->platdata);
	99	if (ret != 0) {
	100	dev_err(lcd->dev, "failed to initialise display\n");
	101	return ret;
	102	}
	103
	104	lcd->initialised = 1;
	105	return 0;
	106	}
	107
	108	static inline int ili9320_power_on(struct ili9320 *lcd)
	109	{
	110	if (!lcd->initialised)
	111	ili9320_init_chip(lcd);
	112
	113	lcd->display1 \|= (ILI9320_DISPLAY1_D(3) \| ILI9320_DISPLAY1_BASEE);
	114	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
	115
	116	return 0;
	117	}
	118
	119	static inline int ili9320_power_off(struct ili9320 *lcd)
	120	{
	121	lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) \| ILI9320_DISPLAY1_BASEE);
	122	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
	123
	124	return 0;
	125	}
	126
	127	#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
	128
	129	static int ili9320_power(struct ili9320 *lcd, int power)
	130	{
	131	int ret = 0;
	132
	133	dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);
	134
	135	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
	136	ret = ili9320_power_on(lcd);
	137	else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
	138	ret = ili9320_power_off(lcd);
	139
140	if (ret == 0)
141	lcd->power = power;
142	else
143	dev_warn(lcd->dev, "failed to set power mode %d\n", power);
144
145	return ret;
146	}
147
148	static inline struct ili9320 to_our_lcd(struct lcd_device lcd)
149	{
150	return lcd_get_data(lcd);
151	}
152
153	static int ili9320_set_power(struct lcd_device *ld, int power)
154	{
155	struct ili9320 *lcd = to_our_lcd(ld);
156
157	return ili9320_power(lcd, power);
158	}
159
160	static int ili9320_get_power(struct lcd_device *ld)
161	{
162	struct ili9320 *lcd = to_our_lcd(ld);
163
164	return lcd->power;
165	}
166
167	static struct lcd_ops ili9320_ops = {
168	.get_power = ili9320_get_power,
169	.set_power = ili9320_set_power,
170	};
171
1b9e450d	172	static void ili9320_setup_spi(struct ili9320 *ili,
cccb6d3c BD	173	struct spi_device *dev)
	174	{
	175	struct ili9320_spi *spi = &ili->access.spi;
	176
	177	ili->write = ili9320_write_spi;
	178	spi->dev = dev;
	179
	180	/* fill the two messages we are going to use to send the data
	181	* with, the first the address followed by the data. The datasheet
	182	* says they should be done as two distinct cycles of the SPI CS line.
	183	*/
	184
	185	spi->xfer[0].tx_buf = spi->buffer_addr;
	186	spi->xfer[1].tx_buf = spi->buffer_data;
	187	spi->xfer[0].len = 3;
	188	spi->xfer[1].len = 3;
	189	spi->xfer[0].bits_per_word = 8;
	190	spi->xfer[1].bits_per_word = 8;
	191	spi->xfer[0].cs_change = 1;
	192
	193	spi_message_init(&spi->message);
	194	spi_message_add_tail(&spi->xfer[0], &spi->message);
	195	spi_message_add_tail(&spi->xfer[1], &spi->message);
	196	}
	197
1b9e450d	198	int ili9320_probe_spi(struct spi_device *spi,
cccb6d3c BD	199	struct ili9320_client *client)
cccb6d3c BD	200	{
c512794c	201	struct ili9320_platdata *cfg = dev_get_platdata(&spi->dev);
cccb6d3c BD	202	struct device *dev = &spi->dev;
	203	struct ili9320 *ili;
	204	struct lcd_device *lcd;
	205	int ret = 0;
	206
	207	/* verify we where given some information */
	208
	209	if (cfg == NULL) {
	210	dev_err(dev, "no platform data supplied\n");
	211	return -EINVAL;
	212	}
	213
	214	if (cfg->hsize <= 0 \|\| cfg->vsize <= 0 \|\| cfg->reset == NULL) {
	215	dev_err(dev, "invalid platform data supplied\n");
	216	return -EINVAL;
	217	}
	218
	219	/* allocate and initialse our state */
	220
9828eb09	221	ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);
a82bdcfb	222	if (ili == NULL)
cccb6d3c	223	return -ENOMEM;
cccb6d3c BD	224
	225	ili->access.spi.id = ILI9320_SPI_IDCODE \| ILI9320_SPI_ID(1);
	226
	227	ili->dev = dev;
	228	ili->client = client;
	229	ili->power = FB_BLANK_POWERDOWN;
	230	ili->platdata = cfg;
	231
5a24b010	232	spi_set_drvdata(spi, ili);
cccb6d3c BD	233
	234	ili9320_setup_spi(ili, spi);
	235
5690378e JH	236	lcd = devm_lcd_device_register(&spi->dev, "ili9320", dev, ili,
5690378e JH	237	&ili9320_ops);
cccb6d3c BD	238	if (IS_ERR(lcd)) {
cccb6d3c BD	239	dev_err(dev, "failed to register lcd device\n");
9828eb09	240	return PTR_ERR(lcd);
cccb6d3c BD	241	}
	242
	243	ili->lcd = lcd;
	244
	245	dev_info(dev, "initialising %s\n", client->name);
	246
	247	ret = ili9320_power(ili, FB_BLANK_UNBLANK);
	248	if (ret != 0) {
	249	dev_err(dev, "failed to set lcd power state\n");
5690378e	250	return ret;
cccb6d3c BD	251	}
	252
	253	return 0;
cccb6d3c	254	}
cccb6d3c BD	255	EXPORT_SYMBOL_GPL(ili9320_probe_spi);
cccb6d3c BD	256
ff944046	257	int ili9320_remove(struct ili9320 *ili)
cccb6d3c BD	258	{
cccb6d3c BD	259	ili9320_power(ili, FB_BLANK_POWERDOWN);
cccb6d3c BD	260	return 0;
cccb6d3c BD	261	}
cccb6d3c BD	262	EXPORT_SYMBOL_GPL(ili9320_remove);
cccb6d3c BD	263
eb39ad25 JH	264	#ifdef CONFIG_PM_SLEEP
eb39ad25 JH	265	int ili9320_suspend(struct ili9320 *lcd)
cccb6d3c BD	266	{
	267	int ret;
	268
eb39ad25	269	ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);
cccb6d3c	270
eb39ad25 JH	271	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
	272	ili9320_write(lcd, ILI9320_POWER1, lcd->power1 \|
	273	ILI9320_POWER1_SLP \|
	274	ILI9320_POWER1_DSTB);
	275	lcd->initialised = 0;
cccb6d3c BD	276	}
cccb6d3c BD	277
eb39ad25	278	return ret;
cccb6d3c	279	}
cccb6d3c BD	280	EXPORT_SYMBOL_GPL(ili9320_suspend);
	281
	282	int ili9320_resume(struct ili9320 *lcd)
	283	{
	284	dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);
	285
c0b6cc49	286	if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)
cccb6d3c	287	ili9320_write(lcd, ILI9320_POWER1, 0x00);
cccb6d3c BD	288
	289	return ili9320_power(lcd, FB_BLANK_UNBLANK);
	290	}
cccb6d3c BD	291	EXPORT_SYMBOL_GPL(ili9320_resume);
	292	#endif
	293
	294	/* Power down all displays on reboot, poweroff or halt */
	295	void ili9320_shutdown(struct ili9320 *lcd)
	296	{
	297	ili9320_power(lcd, FB_BLANK_POWERDOWN);
	298	}
cccb6d3c BD	299	EXPORT_SYMBOL_GPL(ili9320_shutdown);
	300
	301	MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
	302	MODULE_DESCRIPTION("ILI9320 LCD Driver");
	303	MODULE_LICENSE("GPL v2");