text: /*
   * 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");
  