/* * 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 * * 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 #include #include #include #include #include #include #include #include #include #include #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); } 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); } 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); } 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); } 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; } } static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base) { lcdtg_i2c_send_bit(lcd, base); } 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); } 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); } /* 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); } 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; } } 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); } static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m) { struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev); 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; } static int corgi_lcd_set_power(struct lcd_device *ld, int power) { struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev); 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; } static int corgi_lcd_get_power(struct lcd_device *ld) { struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev); return lcd->power; } 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 = dev_get_drvdata(&bd->dev); return lcd->intensity; } 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(lcd->gpio_backlight_cont, cont); if (gpio_is_valid(lcd->gpio_backlight_on)) gpio_set_value(lcd->gpio_backlight_on, intensity); if (lcd->kick_battery) lcd->kick_battery(); lcd->intensity = intensity; return 0; } static int corgi_bl_update_status(struct backlight_device *bd) { struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev); 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); } 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); } 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 static int corgi_lcd_suspend(struct spi_device *spi, pm_message_t state) { struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev); corgibl_flags |= CORGIBL_SUSPENDED; corgi_bl_set_intensity(lcd, 0); corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN); return 0; } static int corgi_lcd_resume(struct spi_device *spi) { struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev); corgibl_flags &= ~CORGIBL_SUSPENDED; corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK); backlight_update_status(lcd->bl_dev); return 0; } #else #define corgi_lcd_suspend NULL #define corgi_lcd_resume NULL #endif 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; } static int corgi_lcd_probe(struct spi_device *spi) { struct backlight_properties props; struct corgi_lcd_platform_data *pdata = spi->dev.platform_data; 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) { dev_err(&spi->dev, "failed to allocate memory\n"); return -ENOMEM; } lcd->spi_dev = spi; lcd->lcd_dev = lcd_device_register("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 = backlight_device_register("corgi_bl", &spi->dev, lcd, &corgi_bl_ops, &props); if (IS_ERR(lcd->bl_dev)) { ret = PTR_ERR(lcd->bl_dev); goto err_unregister_lcd; } lcd->bl_dev->props.brightness = pdata->default_intensity; lcd->bl_dev->props.power = FB_BLANK_UNBLANK; ret = setup_gpio_backlight(lcd, pdata); if (ret) goto err_unregister_bl; lcd->kick_battery = pdata->kick_battery; dev_set_drvdata(&spi->dev, 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; err_unregister_bl: backlight_device_unregister(lcd->bl_dev); err_unregister_lcd: lcd_device_unregister(lcd->lcd_dev); return ret; } static int corgi_lcd_remove(struct spi_device *spi) { struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev); lcd->bl_dev->props.power = FB_BLANK_UNBLANK; lcd->bl_dev->props.brightness = 0; backlight_update_status(lcd->bl_dev); backlight_device_unregister(lcd->bl_dev); corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN); lcd_device_unregister(lcd->lcd_dev); return 0; } static struct spi_driver corgi_lcd_driver = { .driver = { .name = "corgi-lcd", .owner = THIS_MODULE, }, .probe = corgi_lcd_probe, .remove = corgi_lcd_remove, .suspend = corgi_lcd_suspend, .resume = corgi_lcd_resume, }; module_spi_driver(corgi_lcd_driver); MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00"); MODULE_AUTHOR("Eric Miao "); MODULE_LICENSE("GPL"); MODULE_ALIAS("spi:corgi-lcd");