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Release 4.14 drivers/video/backlight/corgi_lcd.c

/*
 *  LCD/Backlight Driver for Sharp Zaurus Handhelds (various models)
 *
 *  Copyright (c) 2004-2006 Richard Purdie
 *
 *  Based on Sharp's 2.4 Backlight Driver
 *
 *  Copyright (c) 2008 Marvell International Ltd.
 *      Converted to SPI device based LCD/Backlight device driver
 *      by Eric Miao <eric.miao@marvell.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.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/fb.h>
#include <linux/lcd.h>
#include <linux/spi/spi.h>
#include <linux/spi/corgi_lcd.h>
#include <linux/slab.h>
#include <asm/mach/sharpsl_param.h>


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

/* Register Addresses */

#define RESCTL_ADRS     0x00

#define PHACTRL_ADRS    0x01

#define DUTYCTRL_ADRS   0x02

#define POWERREG0_ADRS  0x03

#define POWERREG1_ADRS  0x04

#define GPOR3_ADRS      0x05

#define PICTRL_ADRS     0x06

#define POLCTRL_ADRS    0x07

/* Register Bit Definitions */

#define RESCTL_QVGA     0x01

#define RESCTL_VGA      0x00


#define POWER1_VW_ON    0x01  
/* VW Supply FET ON */

#define POWER1_GVSS_ON  0x02  
/* GVSS(-8V) Power Supply ON */

#define POWER1_VDD_ON   0x04  
/* VDD(8V),SVSS(-4V) Power Supply ON */


#define POWER1_VW_OFF   0x00  
/* VW Supply FET OFF */

#define POWER1_GVSS_OFF 0x00  
/* GVSS(-8V) Power Supply OFF */

#define POWER1_VDD_OFF  0x00  
/* VDD(8V),SVSS(-4V) Power Supply OFF */


#define POWER0_COM_DCLK 0x01  
/* COM Voltage DC Bias DAC Serial Data Clock */

#define POWER0_COM_DOUT 0x02  
/* COM Voltage DC Bias DAC Serial Data Out */

#define POWER0_DAC_ON   0x04  
/* DAC Power Supply ON */

#define POWER0_COM_ON   0x08  
/* COM Power Supply ON */

#define POWER0_VCC5_ON  0x10  
/* VCC5 Power Supply ON */


#define POWER0_DAC_OFF  0x00  
/* DAC Power Supply OFF */

#define POWER0_COM_OFF  0x00  
/* COM Power Supply OFF */

#define POWER0_VCC5_OFF 0x00  
/* VCC5 Power Supply OFF */


#define PICTRL_INIT_STATE      0x01

#define PICTRL_INIOFF          0x02

#define PICTRL_POWER_DOWN      0x04

#define PICTRL_COM_SIGNAL_OFF  0x08

#define PICTRL_DAC_SIGNAL_OFF  0x10


#define POLCTRL_SYNC_POL_FALL  0x01

#define POLCTRL_EN_POL_FALL    0x02

#define POLCTRL_DATA_POL_FALL  0x04

#define POLCTRL_SYNC_ACT_H     0x08

#define POLCTRL_EN_ACT_L       0x10


#define POLCTRL_SYNC_POL_RISE  0x00

#define POLCTRL_EN_POL_RISE    0x00

#define POLCTRL_DATA_POL_RISE  0x00

#define POLCTRL_SYNC_ACT_L     0x00

#define POLCTRL_EN_ACT_H       0x00


#define PHACTRL_PHASE_MANUAL   0x01

#define DEFAULT_PHAD_QVGA     (9)

#define DEFAULT_COMADJ        (125)


struct corgi_lcd {
	
struct spi_device	*spi_dev;
	
struct lcd_device	*lcd_dev;
	
struct backlight_device	*bl_dev;

	
int	limit_mask;
	
int	intensity;
	
int	power;
	
int	mode;
	
char	buf[2];

	
int	gpio_backlight_on;
	
int	gpio_backlight_cont;
	
int	gpio_backlight_cont_inverted;

	
void (*kick_battery)(void);
};

static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);


static struct corgi_lcd *the_corgi_lcd;

static unsigned long corgibl_flags;

#define CORGIBL_SUSPENDED     0x01

#define CORGIBL_BATTLOW       0x02

/*
 * This is only a pseudo I2C interface. We can't use the standard kernel
 * routines as the interface is write only. We just assume the data is acked...
 */

static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data) { corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data); udelay(10); }

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static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data) { lcdtg_ssp_i2c_send(lcd, data); lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK); lcdtg_ssp_i2c_send(lcd, data); }

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static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base) { lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT); lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK); lcdtg_ssp_i2c_send(lcd, base); }

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static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base) { lcdtg_ssp_i2c_send(lcd, base); lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK); lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT); }

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static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd, uint8_t base, uint8_t data) { int i; for (i = 0; i < 8; i++) { if (data & 0x80) lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT); else lcdtg_i2c_send_bit(lcd, base); data <<= 1; } }

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static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base) { lcdtg_i2c_send_bit(lcd, base); }

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static void lcdtg_set_common_voltage(struct corgi_lcd *lcd, uint8_t base_data, uint8_t data) { /* Set Common Voltage to M62332FP via I2C */ lcdtg_i2c_send_start(lcd, base_data); lcdtg_i2c_send_byte(lcd, base_data, 0x9c); lcdtg_i2c_wait_ack(lcd, base_data); lcdtg_i2c_send_byte(lcd, base_data, 0x00); lcdtg_i2c_wait_ack(lcd, base_data); lcdtg_i2c_send_byte(lcd, base_data, data); lcdtg_i2c_wait_ack(lcd, base_data); lcdtg_i2c_send_stop(lcd, base_data); }

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static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data) { struct spi_message msg; struct spi_transfer xfer = { .len = 1, .cs_change = 1, .tx_buf = lcd->buf, }; lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f); spi_message_init(&msg); spi_message_add_tail(&xfer, &msg); return spi_sync(lcd->spi_dev, &msg); }

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/* Set Phase Adjust */
static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode) { int adj; switch (mode) { case CORGI_LCD_MODE_VGA: /* Setting for VGA */ adj = sharpsl_param.phadadj; adj = (adj < 0) ? PHACTRL_PHASE_MANUAL : PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1); break; case CORGI_LCD_MODE_QVGA: default: /* Setting for QVGA */ adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL; break; } corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj); }

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static void corgi_lcd_power_on(struct corgi_lcd *lcd) { int comadj; /* Initialize Internal Logic & Port */ corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_POWER_DOWN | PICTRL_INIOFF | PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF | PICTRL_DAC_SIGNAL_OFF); corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF); corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF); /* VDD(+8V), SVSS(-4V) ON */ corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON); mdelay(3); /* DAC ON */ corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF); /* INIB = H, INI = L */ /* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */ corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF); /* Set Common Voltage */ comadj = sharpsl_param.comadj; if (comadj < 0) comadj = DEFAULT_COMADJ; lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF, comadj); /* VCC5 ON, DAC ON */ corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON); /* GVSS(-8V) ON, VDD ON */ corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON); mdelay(2); /* COM SIGNAL ON (PICTL[3] = L) */ corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE); /* COM ON, DAC ON, VCC5_ON */ corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON | POWER0_COM_ON | POWER0_VCC5_ON); /* VW ON, GVSS ON, VDD ON */ corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON); /* Signals output enable */ corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0); /* Set Phase Adjust */ lcdtg_set_phadadj(lcd, lcd->mode); /* Initialize for Input Signals from ATI */ corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS, POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE | POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L | POLCTRL_EN_ACT_H); udelay(1000); switch (lcd->mode) { case CORGI_LCD_MODE_VGA: corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA); break; case CORGI_LCD_MODE_QVGA: default: corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA); break; } }

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static void corgi_lcd_power_off(struct corgi_lcd *lcd) { /* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */ msleep(34); /* (1)VW OFF */ corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON); /* (2)COM OFF */ corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF); corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON); /* (3)Set Common Voltage Bias 0V */ lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON, 0); /* (4)GVSS OFF */ corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON); /* (5)VCC5 OFF */ corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF); /* (6)Set PDWN, INIOFF, DACOFF */ corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF | PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF); /* (7)DAC OFF */ corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF); /* (8)VDD OFF */ corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF); }

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static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m) { struct corgi_lcd *lcd = lcd_get_data(ld); int mode = CORGI_LCD_MODE_QVGA; if (m->xres == 640 || m->xres == 480) mode = CORGI_LCD_MODE_VGA; if (lcd->mode == mode) return 0; lcdtg_set_phadadj(lcd, mode); switch (mode) { case CORGI_LCD_MODE_VGA: corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA); break; case CORGI_LCD_MODE_QVGA: default: corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA); break; } lcd->mode = mode; return 0; }

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static int corgi_lcd_set_power(struct lcd_device *ld, int power) { struct corgi_lcd *lcd = lcd_get_data(ld); if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power)) corgi_lcd_power_on(lcd); if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power)) corgi_lcd_power_off(lcd); lcd->power = power; return 0; }

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static int corgi_lcd_get_power(struct lcd_device *ld) { struct corgi_lcd *lcd = lcd_get_data(ld); return lcd->power; }

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static struct lcd_ops corgi_lcd_ops = { .get_power = corgi_lcd_get_power, .set_power = corgi_lcd_set_power, .set_mode = corgi_lcd_set_mode, };
static int corgi_bl_get_intensity(struct backlight_device *bd) { struct corgi_lcd *lcd = bl_get_data(bd); return lcd->intensity; }

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static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity) { int cont; if (intensity > 0x10) intensity += 0x10; corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity); /* Bit 5 via GPIO_BACKLIGHT_CONT */ cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted; if (gpio_is_valid(lcd->gpio_backlight_cont)) gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont); if (gpio_is_valid(lcd->gpio_backlight_on)) gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity); if (lcd->kick_battery) lcd->kick_battery(); lcd->intensity = intensity; return 0; }

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static int corgi_bl_update_status(struct backlight_device *bd) { struct corgi_lcd *lcd = bl_get_data(bd); int intensity = bd->props.brightness; if (bd->props.power != FB_BLANK_UNBLANK) intensity = 0; if (bd->props.fb_blank != FB_BLANK_UNBLANK) intensity = 0; if (corgibl_flags & CORGIBL_SUSPENDED) intensity = 0; if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask) intensity = lcd->limit_mask; return corgi_bl_set_intensity(lcd, intensity); }

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void corgi_lcd_limit_intensity(int limit) { if (limit) corgibl_flags |= CORGIBL_BATTLOW; else corgibl_flags &= ~CORGIBL_BATTLOW; backlight_update_status(the_corgi_lcd->bl_dev); }

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EXPORT_SYMBOL(corgi_lcd_limit_intensity); static const struct backlight_ops corgi_bl_ops = { .get_brightness = corgi_bl_get_intensity, .update_status = corgi_bl_update_status, }; #ifdef CONFIG_PM_SLEEP
static int corgi_lcd_suspend(struct device *dev) { struct corgi_lcd *lcd = dev_get_drvdata(dev); corgibl_flags |= CORGIBL_SUSPENDED; corgi_bl_set_intensity(lcd, 0); corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN); return 0; }

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static int corgi_lcd_resume(struct device *dev) { struct corgi_lcd *lcd = dev_get_drvdata(dev); corgibl_flags &= ~CORGIBL_SUSPENDED; corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK); backlight_update_status(lcd->bl_dev); return 0; }

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#endif static SIMPLE_DEV_PM_OPS(corgi_lcd_pm_ops, corgi_lcd_suspend, corgi_lcd_resume);
static int setup_gpio_backlight(struct corgi_lcd *lcd, struct corgi_lcd_platform_data *pdata) { struct spi_device *spi = lcd->spi_dev; int err; lcd->gpio_backlight_on = -1; lcd->gpio_backlight_cont = -1; if (gpio_is_valid(pdata->gpio_backlight_on)) { err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_on, "BL_ON"); if (err) { dev_err(&spi->dev, "failed to request GPIO%d for backlight_on\n", pdata->gpio_backlight_on); return err; } lcd->gpio_backlight_on = pdata->gpio_backlight_on; gpio_direction_output(lcd->gpio_backlight_on, 0); } if (gpio_is_valid(pdata->gpio_backlight_cont)) { err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_cont, "BL_CONT"); if (err) { dev_err(&spi->dev, "failed to request GPIO%d for backlight_cont\n", pdata->gpio_backlight_cont); return err; } lcd->gpio_backlight_cont = pdata->gpio_backlight_cont; /* spitz and akita use both GPIOs for backlight, and * have inverted polarity of GPIO_BACKLIGHT_CONT */ if (gpio_is_valid(lcd->gpio_backlight_on)) { lcd->gpio_backlight_cont_inverted = 1; gpio_direction_output(lcd->gpio_backlight_cont, 1); } else { lcd->gpio_backlight_cont_inverted = 0; gpio_direction_output(lcd->gpio_backlight_cont, 0); } } return 0; }

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static int corgi_lcd_probe(struct spi_device *spi) { struct backlight_properties props; struct corgi_lcd_platform_data *pdata = dev_get_platdata(&spi->dev); struct corgi_lcd *lcd; int ret = 0; if (pdata == NULL) { dev_err(&spi->dev, "platform data not available\n"); return -EINVAL; } lcd = devm_kzalloc(&spi->dev, sizeof(struct corgi_lcd), GFP_KERNEL); if (!lcd) return -ENOMEM; lcd->spi_dev = spi; lcd->lcd_dev = devm_lcd_device_register(&spi->dev, "corgi_lcd", &spi->dev, lcd, &corgi_lcd_ops); if (IS_ERR(lcd->lcd_dev)) return PTR_ERR(lcd->lcd_dev); lcd->power = FB_BLANK_POWERDOWN; lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA; memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.max_brightness = pdata->max_intensity; lcd->bl_dev = devm_backlight_device_register(&spi->dev, "corgi_bl", &spi->dev, lcd, &corgi_bl_ops, &props); if (IS_ERR(lcd->bl_dev)) return PTR_ERR(lcd->bl_dev); lcd->bl_dev->props.brightness = pdata->default_intensity; lcd->bl_dev->props.power = FB_BLANK_UNBLANK; ret = setup_gpio_backlight(lcd, pdata); if (ret) return ret; lcd->kick_battery = pdata->kick_battery; spi_set_drvdata(spi, lcd); corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK); backlight_update_status(lcd->bl_dev); lcd->limit_mask = pdata->limit_mask; the_corgi_lcd = lcd; return 0; }

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static int corgi_lcd_remove(struct spi_device *spi) { struct corgi_lcd *lcd = spi_get_drvdata(spi); lcd->bl_dev->props.power = FB_BLANK_UNBLANK; lcd->bl_dev->props.brightness = 0; backlight_update_status(lcd->bl_dev); corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN); return 0; }

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static struct spi_driver corgi_lcd_driver = { .driver = { .name = "corgi-lcd", .pm = &corgi_lcd_pm_ops, }, .probe = corgi_lcd_probe, .remove = corgi_lcd_remove, }; module_spi_driver(corgi_lcd_driver); MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00"); MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("spi:corgi-lcd");

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Anton Vorontsov50.20%14.55%
Tejun Heo30.12%14.55%
Marko Katic20.08%14.55%
Dmitry Baryshkov20.08%14.55%
Axel Lin10.04%14.55%
Lucas De Marchi10.04%14.55%
Emese Revfy10.04%14.55%
Total2499100.00%22100.00%
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