--- /dev/null
+/*
+ * 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/fb.h>
+#include <linux/lcd.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/corgi_lcd.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 intensity;
+ int power;
+ int mode;
+ char buf[2];
+
+ void (*notify)(int intensity);
+ void (*kick_battery)(void);
+};
+
+static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
+
+/*
+ * This is only a psuedo 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)
+{
+ if (intensity > 0x10)
+ intensity += 0x10;
+
+ corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
+ lcd->intensity = intensity;
+
+ if (lcd->notify)
+ lcd->notify(intensity);
+
+ if (lcd->kick_battery)
+ lcd->kick_battery();
+
+ 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;
+
+ return corgi_bl_set_intensity(lcd, intensity);
+}
+
+static 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);
+
+ 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);
+
+ 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 __devinit corgi_lcd_probe(struct spi_device *spi)
+{
+ 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 = kzalloc(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)) {
+ ret = PTR_ERR(lcd->lcd_dev);
+ goto err_free_lcd;
+ }
+ lcd->power = FB_BLANK_POWERDOWN;
+ lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
+
+ lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev,
+ lcd, &corgi_bl_ops);
+ if (IS_ERR(lcd->bl_dev)) {
+ ret = PTR_ERR(lcd->bl_dev);
+ goto err_unregister_lcd;
+ }
+ lcd->bl_dev->props.max_brightness = pdata->max_intensity;
+ lcd->bl_dev->props.brightness = pdata->default_intensity;
+ lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
+
+ lcd->notify = pdata->notify;
+ 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);
+ return 0;
+
+err_unregister_lcd:
+ lcd_device_unregister(lcd->lcd_dev);
+err_free_lcd:
+ kfree(lcd);
+ return ret;
+}
+
+static int __devexit 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);
+ kfree(lcd);
+
+ return 0;
+}
+
+static struct spi_driver corgi_lcd_driver = {
+ .driver = {
+ .name = "corgi-lcd",
+ .owner = THIS_MODULE,
+ },
+ .probe = corgi_lcd_probe,
+ .remove = __devexit_p(corgi_lcd_remove),
+ .suspend = corgi_lcd_suspend,
+ .resume = corgi_lcd_resume,
+};
+
+static int __init corgi_lcd_init(void)
+{
+ return spi_register_driver(&corgi_lcd_driver);
+}
+module_init(corgi_lcd_init);
+
+static void __exit corgi_lcd_exit(void)
+{
+ spi_unregister_driver(&corgi_lcd_driver);
+}
+module_exit(corgi_lcd_exit);
+
+MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
+MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
+MODULE_LICENSE("GPL");
projects / ~andy / linux / commitdiff