[linux-2.6-block.git] / drivers / video / backlight / cr_bllcd.c

/*
 * Copyright (c) Intel Corp. 2007.
 * All Rights Reserved.
 *
 * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
 * develop this driver.
 *
 * This file is part of the Carillo Ranch video subsystem driver.
 * The Carillo Ranch video subsystem driver is free software;
 * you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Carillo Ranch video subsystem driver 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 driver; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Authors:
 *   Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
 *   Alan Hourihane <alanh-at-tungstengraphics-dot-com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/pci.h>

/* The LVDS- and panel power controls sits on the
 * GPIO port of the ISA bridge.
 */

#define CRVML_DEVICE_LPC    0x27B8
#define CRVML_REG_GPIOBAR   0x48
#define CRVML_REG_GPIOEN    0x4C
#define CRVML_GPIOEN_BIT    (1 << 4)
#define CRVML_PANEL_PORT    0x38
#define CRVML_LVDS_ON       0x00000001
#define CRVML_PANEL_ON      0x00000002
#define CRVML_BACKLIGHT_OFF 0x00000004

/* The PLL Clock register sits on Host bridge */
#define CRVML_DEVICE_MCH   0x5001
#define CRVML_REG_MCHBAR   0x44
#define CRVML_REG_MCHEN    0x54
#define CRVML_MCHEN_BIT    (1 << 28)
#define CRVML_MCHMAP_SIZE  4096
#define CRVML_REG_CLOCK    0xc3c
#define CRVML_CLOCK_SHIFT  8
#define CRVML_CLOCK_MASK   0x00000f00

static struct pci_dev *lpc_dev;
static u32 gpio_bar;

struct cr_panel {
	struct backlight_device *cr_backlight_device;
	struct lcd_device *cr_lcd_device;
};

static int cr_backlight_set_intensity(struct backlight_device *bd)
{
	int intensity = bd->props.brightness;
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);

	if (bd->props.power == FB_BLANK_UNBLANK)
		intensity = FB_BLANK_UNBLANK;
	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
		intensity = FB_BLANK_UNBLANK;
	if (bd->props.power == FB_BLANK_POWERDOWN)
		intensity = FB_BLANK_POWERDOWN;
	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
		intensity = FB_BLANK_POWERDOWN;

	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
		cur &= ~CRVML_BACKLIGHT_OFF;
		outl(cur, addr);
	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
		cur |= CRVML_BACKLIGHT_OFF;
		outl(cur, addr);
	} /* anything else, don't bother */

	return 0;
}

static int cr_backlight_get_intensity(struct backlight_device *bd)
{
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);
	u8 intensity;

	if (cur & CRVML_BACKLIGHT_OFF)
		intensity = FB_BLANK_POWERDOWN;
	else
		intensity = FB_BLANK_UNBLANK;

	return intensity;
}

static const struct backlight_ops cr_backlight_ops = {
	.get_brightness = cr_backlight_get_intensity,
	.update_status = cr_backlight_set_intensity,
};

static void cr_panel_on(void)
{
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);

	if (!(cur & CRVML_PANEL_ON)) {
		/* Make sure LVDS controller is down. */
		if (cur & 0x00000001) {
			cur &= ~CRVML_LVDS_ON;
			outl(cur, addr);
		}
		/* Power up Panel */
		schedule_timeout(HZ / 10);
		cur |= CRVML_PANEL_ON;
		outl(cur, addr);
	}

	/* Power up LVDS controller */

	if (!(cur & CRVML_LVDS_ON)) {
		schedule_timeout(HZ / 10);
		outl(cur | CRVML_LVDS_ON, addr);
	}
}

static void cr_panel_off(void)
{
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);

	/* Power down LVDS controller first to avoid high currents */
	if (cur & CRVML_LVDS_ON) {
		cur &= ~CRVML_LVDS_ON;
		outl(cur, addr);
	}
	if (cur & CRVML_PANEL_ON) {
		schedule_timeout(HZ / 10);
		outl(cur & ~CRVML_PANEL_ON, addr);
	}
}

static int cr_lcd_set_power(struct lcd_device *ld, int power)
{
	if (power == FB_BLANK_UNBLANK)
		cr_panel_on();
	if (power == FB_BLANK_POWERDOWN)
		cr_panel_off();

	return 0;
}

static struct lcd_ops cr_lcd_ops = {
	.set_power = cr_lcd_set_power,
};

static int cr_backlight_probe(struct platform_device *pdev)
{
	struct backlight_properties props;
	struct backlight_device *bdp;
	struct lcd_device *ldp;
	struct cr_panel *crp;
	u8 dev_en;

	lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
					CRVML_DEVICE_LPC, NULL);
	if (!lpc_dev) {
		printk("INTEL CARILLO RANCH LPC not found.\n");
		return -ENODEV;
	}

	pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
	if (!(dev_en & CRVML_GPIOEN_BIT)) {
		printk(KERN_ERR
		       "Carillo Ranch GPIO device was not enabled.\n");
		pci_dev_put(lpc_dev);
		return -ENODEV;
	}

	memset(&props, 0, sizeof(struct backlight_properties));
	bdp = backlight_device_register("cr-backlight", &pdev->dev, NULL,
					&cr_backlight_ops, &props);
	if (IS_ERR(bdp)) {
		pci_dev_put(lpc_dev);
		return PTR_ERR(bdp);
	}

	ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops);
	if (IS_ERR(ldp)) {
		backlight_device_unregister(bdp);
		pci_dev_put(lpc_dev);
		return PTR_ERR(ldp);
	}

	pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
			      &gpio_bar);
	gpio_bar &= ~0x3F;

	crp = kzalloc(sizeof(*crp), GFP_KERNEL);
	if (!crp) {
		lcd_device_unregister(ldp);
		backlight_device_unregister(bdp);
		pci_dev_put(lpc_dev);
		return -ENOMEM;
	}

	crp->cr_backlight_device = bdp;
	crp->cr_lcd_device = ldp;
	crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
	crp->cr_backlight_device->props.brightness = 0;
	cr_backlight_set_intensity(crp->cr_backlight_device);
	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);

	platform_set_drvdata(pdev, crp);

	return 0;
}

static int cr_backlight_remove(struct platform_device *pdev)
{
	struct cr_panel *crp = platform_get_drvdata(pdev);
	crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
	crp->cr_backlight_device->props.brightness = 0;
	crp->cr_backlight_device->props.max_brightness = 0;
	cr_backlight_set_intensity(crp->cr_backlight_device);
	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
	backlight_device_unregister(crp->cr_backlight_device);
	lcd_device_unregister(crp->cr_lcd_device);
	pci_dev_put(lpc_dev);

	return 0;
}

static struct platform_driver cr_backlight_driver = {
	.probe = cr_backlight_probe,
	.remove = cr_backlight_remove,
	.driver = {
		   .name = "cr_backlight",
		   },
};

static struct platform_device *crp;

static int __init cr_backlight_init(void)
{
	int ret = platform_driver_register(&cr_backlight_driver);

	if (ret)
		return ret;

	crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
	if (IS_ERR(crp)) {
		platform_driver_unregister(&cr_backlight_driver);
		return PTR_ERR(crp);
	}

	printk("Carillo Ranch Backlight Driver Initialized.\n");

	return 0;
}

static void __exit cr_backlight_exit(void)
{
	platform_device_unregister(crp);
	platform_driver_unregister(&cr_backlight_driver);
}

module_init(cr_backlight_init);
module_exit(cr_backlight_exit);

MODULE_AUTHOR("Tungsten Graphics Inc.");
MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
dbe7e429 AH	1	/*
	2	* Copyright (c) Intel Corp. 2007.
	3	* All Rights Reserved.
	4	*
	5	* Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
	6	* develop this driver.
	7	*
	8	* This file is part of the Carillo Ranch video subsystem driver.
	9	* The Carillo Ranch video subsystem driver is free software;
	10	* you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* The Carillo Ranch video subsystem driver is distributed
	16	* in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this driver; if not, write to the Free Software
	23	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	24	*
	25	* Authors:
	26	* Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
	27	* Alan Hourihane <alanh-at-tungstengraphics-dot-com>
	28	*/
	29
	30	#include <linux/module.h>
	31	#include <linux/kernel.h>
	32	#include <linux/init.h>
	33	#include <linux/platform_device.h>
	34	#include <linux/mutex.h>
	35	#include <linux/fb.h>
	36	#include <linux/backlight.h>
	37	#include <linux/lcd.h>
	38	#include <linux/pci.h>
dbe7e429 AH	39
	40	/* The LVDS- and panel power controls sits on the
	41	* GPIO port of the ISA bridge.
	42	*/
	43
	44	#define CRVML_DEVICE_LPC 0x27B8
	45	#define CRVML_REG_GPIOBAR 0x48
	46	#define CRVML_REG_GPIOEN 0x4C
	47	#define CRVML_GPIOEN_BIT (1 << 4)
	48	#define CRVML_PANEL_PORT 0x38
	49	#define CRVML_LVDS_ON 0x00000001
	50	#define CRVML_PANEL_ON 0x00000002
	51	#define CRVML_BACKLIGHT_OFF 0x00000004
	52
	53	/* The PLL Clock register sits on Host bridge */
	54	#define CRVML_DEVICE_MCH 0x5001
	55	#define CRVML_REG_MCHBAR 0x44
	56	#define CRVML_REG_MCHEN 0x54
	57	#define CRVML_MCHEN_BIT (1 << 28)
	58	#define CRVML_MCHMAP_SIZE 4096
	59	#define CRVML_REG_CLOCK 0xc3c
	60	#define CRVML_CLOCK_SHIFT 8
	61	#define CRVML_CLOCK_MASK 0x00000f00
	62
	63	static struct pci_dev *lpc_dev;
	64	static u32 gpio_bar;
	65
	66	struct cr_panel {
	67	struct backlight_device *cr_backlight_device;
	68	struct lcd_device *cr_lcd_device;
	69	};
	70
	71	static int cr_backlight_set_intensity(struct backlight_device *bd)
	72	{
	73	int intensity = bd->props.brightness;
	74	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	75	u32 cur = inl(addr);
	76
	77	if (bd->props.power == FB_BLANK_UNBLANK)
	78	intensity = FB_BLANK_UNBLANK;
	79	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
	80	intensity = FB_BLANK_UNBLANK;
	81	if (bd->props.power == FB_BLANK_POWERDOWN)
	82	intensity = FB_BLANK_POWERDOWN;
	83	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
	84	intensity = FB_BLANK_POWERDOWN;
	85
	86	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
	87	cur &= ~CRVML_BACKLIGHT_OFF;
	88	outl(cur, addr);
	89	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
	90	cur \|= CRVML_BACKLIGHT_OFF;
	91	outl(cur, addr);
	92	} /* anything else, don't bother */
	93
	94	return 0;
	95	}
	96
	97	static int cr_backlight_get_intensity(struct backlight_device *bd)
	98	{
	99	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	100	u32 cur = inl(addr);
	101	u8 intensity;
	102
103	if (cur & CRVML_BACKLIGHT_OFF)
104	intensity = FB_BLANK_POWERDOWN;
105	else
106	intensity = FB_BLANK_UNBLANK;
107
108	return intensity;
109	}
110
9905a43b	111	static const struct backlight_ops cr_backlight_ops = {
dbe7e429 AH	112	.get_brightness = cr_backlight_get_intensity,
	113	.update_status = cr_backlight_set_intensity,
	114	};
	115
	116	static void cr_panel_on(void)
	117	{
	118	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	119	u32 cur = inl(addr);
	120
	121	if (!(cur & CRVML_PANEL_ON)) {
	122	/* Make sure LVDS controller is down. */
	123	if (cur & 0x00000001) {
	124	cur &= ~CRVML_LVDS_ON;
	125	outl(cur, addr);
	126	}
	127	/* Power up Panel */
	128	schedule_timeout(HZ / 10);
	129	cur \|= CRVML_PANEL_ON;
	130	outl(cur, addr);
	131	}
	132
	133	/* Power up LVDS controller */
	134
	135	if (!(cur & CRVML_LVDS_ON)) {
	136	schedule_timeout(HZ / 10);
	137	outl(cur \| CRVML_LVDS_ON, addr);
	138	}
	139	}
	140
	141	static void cr_panel_off(void)
	142	{
	143	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	144	u32 cur = inl(addr);
	145
	146	/* Power down LVDS controller first to avoid high currents */
	147	if (cur & CRVML_LVDS_ON) {
	148	cur &= ~CRVML_LVDS_ON;
	149	outl(cur, addr);
	150	}
	151	if (cur & CRVML_PANEL_ON) {
	152	schedule_timeout(HZ / 10);
	153	outl(cur & ~CRVML_PANEL_ON, addr);
	154	}
	155	}
	156
	157	static int cr_lcd_set_power(struct lcd_device *ld, int power)
	158	{
	159	if (power == FB_BLANK_UNBLANK)
	160	cr_panel_on();
	161	if (power == FB_BLANK_POWERDOWN)
	162	cr_panel_off();
	163
	164	return 0;
	165	}
	166
	167	static struct lcd_ops cr_lcd_ops = {
	168	.set_power = cr_lcd_set_power,
	169	};
	170
	171	static int cr_backlight_probe(struct platform_device *pdev)
	172	{
a19a6ee6	173	struct backlight_properties props;
0b75f2df JJ	174	struct backlight_device *bdp;
0b75f2df JJ	175	struct lcd_device *ldp;
dbe7e429 AH	176	struct cr_panel *crp;
	177	u8 dev_en;
	178
dbe7e429 AH	179	lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
	180	CRVML_DEVICE_LPC, NULL);
	181	if (!lpc_dev) {
	182	printk("INTEL CARILLO RANCH LPC not found.\n");
	183	return -ENODEV;
	184	}
	185
	186	pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
	187	if (!(dev_en & CRVML_GPIOEN_BIT)) {
	188	printk(KERN_ERR
	189	"Carillo Ranch GPIO device was not enabled.\n");
	190	pci_dev_put(lpc_dev);
	191	return -ENODEV;
	192	}
	193
a19a6ee6 MG	194	memset(&props, 0, sizeof(struct backlight_properties));
	195	bdp = backlight_device_register("cr-backlight", &pdev->dev, NULL,
	196	&cr_backlight_ops, &props);
0b75f2df	197	if (IS_ERR(bdp)) {
dbe7e429	198	pci_dev_put(lpc_dev);
0b75f2df	199	return PTR_ERR(bdp);
dbe7e429 AH	200	}
dbe7e429 AH	201
0b75f2df JJ	202	ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops);
	203	if (IS_ERR(ldp)) {
	204	backlight_device_unregister(bdp);
dbe7e429	205	pci_dev_put(lpc_dev);
5b0582ea	206	return PTR_ERR(ldp);
dbe7e429 AH	207	}
	208
	209	pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
	210	&gpio_bar);
	211	gpio_bar &= ~0x3F;
	212
0b75f2df JJ	213	crp = kzalloc(sizeof(*crp), GFP_KERNEL);
	214	if (!crp) {
	215	lcd_device_unregister(ldp);
	216	backlight_device_unregister(bdp);
	217	pci_dev_put(lpc_dev);
	218	return -ENOMEM;
	219	}
	220
	221	crp->cr_backlight_device = bdp;
	222	crp->cr_lcd_device = ldp;
dbe7e429 AH	223	crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
dbe7e429 AH	224	crp->cr_backlight_device->props.brightness = 0;
dbe7e429	225	cr_backlight_set_intensity(crp->cr_backlight_device);
dbe7e429 AH	226	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);
	227
	228	platform_set_drvdata(pdev, crp);
	229
	230	return 0;
	231	}
	232
	233	static int cr_backlight_remove(struct platform_device *pdev)
	234	{
	235	struct cr_panel *crp = platform_get_drvdata(pdev);
	236	crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
	237	crp->cr_backlight_device->props.brightness = 0;
	238	crp->cr_backlight_device->props.max_brightness = 0;
	239	cr_backlight_set_intensity(crp->cr_backlight_device);
	240	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
	241	backlight_device_unregister(crp->cr_backlight_device);
	242	lcd_device_unregister(crp->cr_lcd_device);
	243	pci_dev_put(lpc_dev);
	244
	245	return 0;
	246	}
	247
	248	static struct platform_driver cr_backlight_driver = {
	249	.probe = cr_backlight_probe,
	250	.remove = cr_backlight_remove,
	251	.driver = {
	252	.name = "cr_backlight",
	253	},
	254	};
	255
	256	static struct platform_device *crp;
	257
	258	static int __init cr_backlight_init(void)
	259	{
	260	int ret = platform_driver_register(&cr_backlight_driver);
	261
b4a11d3d AM	262	if (ret)
b4a11d3d AM	263	return ret;
dbe7e429	264
b4a11d3d AM	265	crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
	266	if (IS_ERR(crp)) {
	267	platform_driver_unregister(&cr_backlight_driver);
	268	return PTR_ERR(crp);
dbe7e429 AH	269	}
	270
	271	printk("Carillo Ranch Backlight Driver Initialized.\n");
	272
b4a11d3d	273	return 0;
dbe7e429 AH	274	}
	275
	276	static void __exit cr_backlight_exit(void)
	277	{
	278	platform_device_unregister(crp);
	279	platform_driver_unregister(&cr_backlight_driver);
	280	}
	281
	282	module_init(cr_backlight_init);
	283	module_exit(cr_backlight_exit);
	284
	285	MODULE_AUTHOR("Tungsten Graphics Inc.");
	286	MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
	287	MODULE_LICENSE("GPL");