1. 根目录:
2. drivers
3. video
4. omap2
5. displays
6. panel-picodlp.c

/*
 * picodlp panel driver
 * picodlp_i2c_driver: i2c_client driver
 *
 * Copyright (C) 2009-2011 Texas Instruments
 * Author: Mythri P K <mythripk@ti.com>
 * Mayuresh Janorkar <mayur@ti.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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/gpio.h>

#include <video/omapdss.h>
#include <video/omap-panel-picodlp.h>

#include "panel-picodlp.h"

struct picodlp_data {
	struct mutex lock;
	struct i2c_client *picodlp_i2c_client;
};

static struct i2c_board_info picodlp_i2c_board_info = {
	I2C_BOARD_INFO("picodlp_i2c_driver", 0x1b),
};

struct picodlp_i2c_data {
	struct mutex xfer_lock;
};

static struct i2c_device_id picodlp_i2c_id[] = {
	{ "picodlp_i2c_driver", 0 },
};

struct picodlp_i2c_command {
	u8 reg;
	u32 value;
};

static struct omap_video_timings pico_ls_timings = {
	.x_res		= 864,
	.y_res		= 480,
	.hsw		= 7,
	.hfp		= 11,
	.hbp		= 7,

	.pixel_clock	= 19200,

	.vsw		= 2,
	.vfp		= 3,
	.vbp		= 14,
};

static inline struct picodlp_panel_data
		*get_panel_data(const struct omap_dss_device *dssdev)
{
	return (struct picodlp_panel_data *) dssdev->data;
}

static u32 picodlp_i2c_read(struct i2c_client *client, u8 reg)
{
	u8 read_cmd[] = {READ_REG_SELECT, reg}, data[4];
	struct picodlp_i2c_data *picodlp_i2c_data = i2c_get_clientdata(client);
	struct i2c_msg msg[2];

	mutex_lock(&picodlp_i2c_data->xfer_lock);

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].len = 2;
	msg[0].buf = read_cmd;

	msg[1].addr = client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].len = 4;
	msg[1].buf = data;

	i2c_transfer(client->adapter, msg, 2);
	mutex_unlock(&picodlp_i2c_data->xfer_lock);
	return (data[3] | (data[2] << 8) | (data[1] << 16) | (data[0] << 24));
}

static int picodlp_i2c_write_block(struct i2c_client *client,
					u8 *data, int len)
{
	struct i2c_msg msg;
	int i, r, msg_count = 1;

	struct picodlp_i2c_data *picodlp_i2c_data = i2c_get_clientdata(client);

	if (len < 1 || len > 32) {
		dev_err(&client->dev,
			"too long syn_write_block len %d\n", len);
		return -EIO;
	}
	mutex_lock(&picodlp_i2c_data->xfer_lock);

	msg.addr = client->addr;
	msg.flags = 0;
	msg.len = len;
	msg.buf = data;
	r = i2c_transfer(client->adapter, &msg, msg_count);
	mutex_unlock(&picodlp_i2c_data->xfer_lock);

	/*
	 * i2c_transfer returns:
	 * number of messages sent in case of success
	 * a negative error number in case of failure
	 */
	if (r != msg_count)
		goto err;

	/* In case of success */
	for (i = 0; i < len; i++)
		dev_dbg(&client->dev,
			"addr %x bw 0x%02x[%d]: 0x%02x\n",
			client->addr, data[0] + i, i, data[i]);

	return 0;
err:
	dev_err(&client->dev, "picodlp_i2c_write error\n");
	return r;
}

static int picodlp_i2c_write(struct i2c_client *client, u8 reg, u32 value)
{
	u8 data[5];
	int i;

	data[0] = reg;
	for (i = 1; i < 5; i++)
		data[i] = (value >> (32 - (i) * 8)) & 0xFF;

	return picodlp_i2c_write_block(client, data, 5);
}

static int picodlp_i2c_write_array(struct i2c_client *client,
			const struct picodlp_i2c_command commands[],
			int count)
{
	int i, r = 0;
	for (i = 0; i < count; i++) {
		r = picodlp_i2c_write(client, commands[i].reg,
						commands[i].value);
		if (r)
			return r;
	}
	return r;
}

static int picodlp_wait_for_dma_done(struct i2c_client *client)
{
	u8 trial = 100;

	do {
		msleep(1);
		if (!trial--)
			return -ETIMEDOUT;
	} while (picodlp_i2c_read(client, MAIN_STATUS) & DMA_STATUS);

	return 0;
}

/**
 * picodlp_i2c_init:	i2c_initialization routine
 * client:	i2c_client for communication
 *
 * return
 *		0	: Success, no error
 *	error code	: Failure
 */
static int picodlp_i2c_init(struct i2c_client *client)
{
	int r;
	static const struct picodlp_i2c_command init_cmd_set1[] = {
		{SOFT_RESET, 1},
		{DMD_PARK_TRIGGER, 1},
		{MISC_REG, 5},
		{SEQ_CONTROL, 0},
		{SEQ_VECTOR, 0x100},
		{DMD_BLOCK_COUNT, 7},
		{DMD_VCC_CONTROL, 0x109},
		{DMD_PARK_PULSE_COUNT, 0xA},
		{DMD_PARK_PULSE_WIDTH, 0xB},
		{DMD_PARK_DELAY, 0x2ED},
		{DMD_SHADOW_ENABLE, 0},
		{FLASH_OPCODE, 0xB},
		{FLASH_DUMMY_BYTES, 1},
		{FLASH_ADDR_BYTES, 3},
		{PBC_CONTROL, 0},
		{FLASH_START_ADDR, CMT_LUT_0_START_ADDR},
		{FLASH_READ_BYTES, CMT_LUT_0_SIZE},
		{CMT_SPLASH_LUT_START_ADDR, 0},
		{CMT_SPLASH_LUT_DEST_SELECT, CMT_LUT_ALL},
		{PBC_CONTROL, 1},
	};

	static const struct picodlp_i2c_command init_cmd_set2[] = {
		{PBC_CONTROL, 0},
		{CMT_SPLASH_LUT_DEST_SELECT, 0},
		{PBC_CONTROL, 0},
		{FLASH_START_ADDR, SEQUENCE_0_START_ADDR},
		{FLASH_READ_BYTES, SEQUENCE_0_SIZE},
		{SEQ_RESET_LUT_START_ADDR, 0},
		{SEQ_RESET_LUT_DEST_SELECT, SEQ_SEQ_LUT},
		{PBC_CONTROL, 1},
	};

	static const struct picodlp_i2c_command init_cmd_set3[] = {
		{PBC_CONTROL, 0},
		{SEQ_RESET_LUT_DEST_SELECT, 0},
		{PBC_CONTROL, 0},
		{FLASH_START_ADDR, DRC_TABLE_0_START_ADDR},
		{FLASH_READ_BYTES, DRC_TABLE_0_SIZE},
		{SEQ_RESET_LUT_START_ADDR, 0},
		{SEQ_RESET_LUT_DEST_SELECT, SEQ_DRC_LUT_ALL},
		{PBC_CONTROL, 1},
	};

	static const struct picodlp_i2c_command init_cmd_set4[] = {
		{PBC_CONTROL, 0},
		{SEQ_RESET_LUT_DEST_SELECT, 0},
		{SDC_ENABLE, 1},
		{AGC_CTRL, 7},
		{CCA_C1A, 0x100},
		{CCA_C1B, 0x0},
		{CCA_C1C, 0x0},
		{CCA_C2A, 0x0},
		{CCA_C2B, 0x100},
		{CCA_C2C, 0x0},
		{CCA_C3A, 0x0},
		{CCA_C3B, 0x0},
		{CCA_C3C, 0x100},
		{CCA_C7A, 0x100},
		{CCA_C7B, 0x100},
		{CCA_C7C, 0x100},
		{CCA_ENABLE, 1},
		{CPU_IF_MODE, 1},
		{SHORT_FLIP, 1},
		{CURTAIN_CONTROL, 0},
		{DMD_PARK_TRIGGER, 0},
		{R_DRIVE_CURRENT, 0x298},
		{G_DRIVE_CURRENT, 0x298},
		{B_DRIVE_CURRENT, 0x298},
		{RGB_DRIVER_ENABLE, 7},
		{SEQ_CONTROL, 0},
		{ACTGEN_CONTROL, 0x10},
		{SEQUENCE_MODE, SEQ_LOCK},
		{DATA_FORMAT, RGB888},
		{INPUT_RESOLUTION, WVGA_864_LANDSCAPE},
		{INPUT_SOURCE, PARALLEL_RGB},
		{CPU_IF_SYNC_METHOD, 1},
		{SEQ_CONTROL, 1}
	};

	r = picodlp_i2c_write_array(client, init_cmd_set1,
						ARRAY_SIZE(init_cmd_set1));
	if (r)
		return r;

	r = picodlp_wait_for_dma_done(client);
	if (r)
		return r;

	r = picodlp_i2c_write_array(client, init_cmd_set2,
					ARRAY_SIZE(init_cmd_set2));
	if (r)
		return r;

	r = picodlp_wait_for_dma_done(client);
	if (r)
		return r;

	r = picodlp_i2c_write_array(client, init_cmd_set3,
					ARRAY_SIZE(init_cmd_set3));
	if (r)
		return r;

	r = picodlp_wait_for_dma_done(client);
	if (r)
		return r;

	r = picodlp_i2c_write_array(client, init_cmd_set4,
					ARRAY_SIZE(init_cmd_set4));
	if (r)
		return r;

	return 0;
}

static int picodlp_i2c_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	struct picodlp_i2c_data *picodlp_i2c_data;

	picodlp_i2c_data = kzalloc(sizeof(struct picodlp_i2c_data), GFP_KERNEL);

	if (!picodlp_i2c_data)
		return -ENOMEM;

	mutex_init(&picodlp_i2c_data->xfer_lock);
	i2c_set_clientdata(client, picodlp_i2c_data);

	return 0;
}

static int picodlp_i2c_remove(struct i2c_client *client)
{
	struct picodlp_i2c_data *picodlp_i2c_data =
					i2c_get_clientdata(client);
	kfree(picodlp_i2c_data);
	return 0;
}

static struct i2c_driver picodlp_i2c_driver = {
	.driver = {
		.name	= "picodlp_i2c_driver",
	},
	.probe		= picodlp_i2c_probe,
	.remove		= picodlp_i2c_remove,
	.id_table	= picodlp_i2c_id,
};

static int picodlp_panel_power_on(struct omap_dss_device *dssdev)
{
	int r, trial = 100;
	struct picodlp_data *picod = dev_get_drvdata(&dssdev->dev);
	struct picodlp_panel_data *picodlp_pdata = get_panel_data(dssdev);

	if (dssdev->platform_enable) {
		r = dssdev->platform_enable(dssdev);
		if (r)
			return r;
	}

	gpio_set_value(picodlp_pdata->pwrgood_gpio, 0);
	msleep(1);
	gpio_set_value(picodlp_pdata->pwrgood_gpio, 1);

	while (!gpio_get_value(picodlp_pdata->emu_done_gpio)) {
		if (!trial--) {
			dev_err(&dssdev->dev, "emu_done signal not"
						" going high\n");
			return -ETIMEDOUT;
		}
		msleep(5);
	}
	/*
	 * As per dpp2600 programming guide,
	 * it is required to sleep for 1000ms after emu_done signal goes high
	 * then only i2c commands can be successfully sent to dpp2600
	 */
	msleep(1000);
	r = omapdss_dpi_display_enable(dssdev);
	if (r) {
		dev_err(&dssdev->dev, "failed to enable DPI\n");
		goto err1;
	}

	r = picodlp_i2c_init(picod->picodlp_i2c_client);
	if (r)
		goto err;

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return r;
err:
	omapdss_dpi_display_disable(dssdev);
err1:
	if (dssdev->platform_disable)
		dssdev->platform_disable(dssdev);

	return r;
}

static void picodlp_panel_power_off(struct omap_dss_device *dssdev)
{
	struct picodlp_panel_data *picodlp_pdata = get_panel_data(dssdev);

	omapdss_dpi_display_disable(dssdev);

	gpio_set_value(picodlp_pdata->emu_done_gpio, 0);
	gpio_set_value(picodlp_pdata->pwrgood_gpio, 0);

	if (dssdev->platform_disable)
		dssdev->platform_disable(dssdev);
}

static int picodlp_panel_probe(struct omap_dss_device *dssdev)
{
	struct picodlp_data *picod;
	struct picodlp_panel_data *picodlp_pdata = get_panel_data(dssdev);
	struct i2c_adapter *adapter;
	struct i2c_client *picodlp_i2c_client;
	int r = 0, picodlp_adapter_id;

	dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_ONOFF |
				OMAP_DSS_LCD_IHS | OMAP_DSS_LCD_IVS;
	dssdev->panel.acb = 0x0;
	dssdev->panel.timings = pico_ls_timings;

	picod =  kzalloc(sizeof(struct picodlp_data), GFP_KERNEL);
	if (!picod)
		return -ENOMEM;

	mutex_init(&picod->lock);

	picodlp_adapter_id = picodlp_pdata->picodlp_adapter_id;

	adapter = i2c_get_adapter(picodlp_adapter_id);
	if (!adapter) {
		dev_err(&dssdev->dev, "can't get i2c adapter\n");
		r = -ENODEV;
		goto err;
	}

	picodlp_i2c_client = i2c_new_device(adapter, &picodlp_i2c_board_info);
	if (!picodlp_i2c_client) {
		dev_err(&dssdev->dev, "can't add i2c device::"
					 " picodlp_i2c_client is NULL\n");
		r = -ENODEV;
		goto err;
	}

	picod->picodlp_i2c_client = picodlp_i2c_client;

	dev_set_drvdata(&dssdev->dev, picod);
	return r;
err:
	kfree(picod);
	return r;
}

static void picodlp_panel_remove(struct omap_dss_device *dssdev)
{
	struct picodlp_data *picod = dev_get_drvdata(&dssdev->dev);

	i2c_unregister_device(picod->picodlp_i2c_client);
	dev_set_drvdata(&dssdev->dev, NULL);
	dev_dbg(&dssdev->dev, "removing picodlp panel\n");

	kfree(picod);
}

static int picodlp_panel_enable(struct omap_dss_device *dssdev)
{
	struct picodlp_data *picod = dev_get_drvdata(&dssdev->dev);
	int r;

	dev_dbg(&dssdev->dev, "enabling picodlp panel\n");

	mutex_lock(&picod->lock);
	if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
		mutex_unlock(&picod->lock);
		return -EINVAL;
	}

	r = picodlp_panel_power_on(dssdev);
	mutex_unlock(&picod->lock);

	return r;
}

static void picodlp_panel_disable(struct omap_dss_device *dssdev)
{
	struct picodlp_data *picod = dev_get_drvdata(&dssdev->dev);

	mutex_lock(&picod->lock);
	/* Turn off DLP Power */
	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
		picodlp_panel_power_off(dssdev);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
	mutex_unlock(&picod->lock);

	dev_dbg(&dssdev->dev, "disabling picodlp panel\n");
}

static int picodlp_panel_suspend(struct omap_dss_device *dssdev)
{
	struct picodlp_data *picod = dev_get_drvdata(&dssdev->dev);

	mutex_lock(&picod->lock);
	/* Turn off DLP Power */
	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
		mutex_unlock(&picod->lock);
		dev_err(&dssdev->dev, "unable to suspend picodlp panel,"
					" panel is not ACTIVE\n");
		return -EINVAL;
	}

	picodlp_panel_power_off(dssdev);

	dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
	mutex_unlock(&picod->lock);

	dev_dbg(&dssdev->dev, "suspending picodlp panel\n");
	return 0;
}

static int picodlp_panel_resume(struct omap_dss_device *dssdev)
{
	struct picodlp_data *picod = dev_get_drvdata(&dssdev->dev);
	int r;

	mutex_lock(&picod->lock);
	if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) {
		mutex_unlock(&picod->lock);
		dev_err(&dssdev->dev, "unable to resume picodlp panel,"
			" panel is not ACTIVE\n");
		return -EINVAL;
	}

	r = picodlp_panel_power_on(dssdev);
	mutex_unlock(&picod->lock);
	dev_dbg(&dssdev->dev, "resuming picodlp panel\n");
	return r;
}

static void picodlp_get_resolution(struct omap_dss_device *dssdev,
					u16 *xres, u16 *yres)
{
	*xres = dssdev->panel.timings.x_res;
	*yres = dssdev->panel.timings.y_res;
}

static struct omap_dss_driver picodlp_driver = {
	.probe		= picodlp_panel_probe,
	.remove		= picodlp_panel_remove,

	.enable		= picodlp_panel_enable,
	.disable	= picodlp_panel_disable,

	.get_resolution	= picodlp_get_resolution,

	.suspend	= picodlp_panel_suspend,
	.resume		= picodlp_panel_resume,

	.driver		= {
		.name	= "picodlp_panel",
		.owner	= THIS_MODULE,
	},
};

static int __init picodlp_init(void)
{
	int r = 0;

	r = i2c_add_driver(&picodlp_i2c_driver);
	if (r) {
		printk(KERN_WARNING "picodlp_i2c_driver" \
			" registration failed\n");
		return r;
	}

	r = omap_dss_register_driver(&picodlp_driver);
	if (r)
		i2c_del_driver(&picodlp_i2c_driver);

	return r;
}

static void __exit picodlp_exit(void)
{
	i2c_del_driver(&picodlp_i2c_driver);
	omap_dss_unregister_driver(&picodlp_driver);
}

module_init(picodlp_init);
module_exit(picodlp_exit);

MODULE_AUTHOR("Mythri P K <mythripk@ti.com>");
MODULE_DESCRIPTION("picodlp driver");
MODULE_LICENSE("GPL");