[mirror_ubuntu-artful-kernel.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>
#include <linux/slab.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>
5a0e3ad6	39	#include <linux/slab.h>
dbe7e429 AH	40
	41	/* The LVDS- and panel power controls sits on the
	42	* GPIO port of the ISA bridge.
	43	*/
	44
	45	#define CRVML_DEVICE_LPC 0x27B8
	46	#define CRVML_REG_GPIOBAR 0x48
	47	#define CRVML_REG_GPIOEN 0x4C
	48	#define CRVML_GPIOEN_BIT (1 << 4)
	49	#define CRVML_PANEL_PORT 0x38
	50	#define CRVML_LVDS_ON 0x00000001
	51	#define CRVML_PANEL_ON 0x00000002
	52	#define CRVML_BACKLIGHT_OFF 0x00000004
	53
	54	/* The PLL Clock register sits on Host bridge */
	55	#define CRVML_DEVICE_MCH 0x5001
	56	#define CRVML_REG_MCHBAR 0x44
	57	#define CRVML_REG_MCHEN 0x54
	58	#define CRVML_MCHEN_BIT (1 << 28)
	59	#define CRVML_MCHMAP_SIZE 4096
	60	#define CRVML_REG_CLOCK 0xc3c
	61	#define CRVML_CLOCK_SHIFT 8
	62	#define CRVML_CLOCK_MASK 0x00000f00
	63
	64	static struct pci_dev *lpc_dev;
	65	static u32 gpio_bar;
	66
	67	struct cr_panel {
	68	struct backlight_device *cr_backlight_device;
	69	struct lcd_device *cr_lcd_device;
	70	};
	71
	72	static int cr_backlight_set_intensity(struct backlight_device *bd)
	73	{
	74	int intensity = bd->props.brightness;
	75	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	76	u32 cur = inl(addr);
	77
	78	if (bd->props.power == FB_BLANK_UNBLANK)
	79	intensity = FB_BLANK_UNBLANK;
	80	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
	81	intensity = FB_BLANK_UNBLANK;
	82	if (bd->props.power == FB_BLANK_POWERDOWN)
	83	intensity = FB_BLANK_POWERDOWN;
	84	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
	85	intensity = FB_BLANK_POWERDOWN;
	86
	87	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
	88	cur &= ~CRVML_BACKLIGHT_OFF;
	89	outl(cur, addr);
	90	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
	91	cur \|= CRVML_BACKLIGHT_OFF;
	92	outl(cur, addr);
	93	} /* anything else, don't bother */
	94
	95	return 0;
	96	}
	97
	98	static int cr_backlight_get_intensity(struct backlight_device *bd)
	99	{
	100	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	101	u32 cur = inl(addr);
	102	u8 intensity;
	103
104	if (cur & CRVML_BACKLIGHT_OFF)
105	intensity = FB_BLANK_POWERDOWN;
106	else
107	intensity = FB_BLANK_UNBLANK;
108
109	return intensity;
110	}
111
9905a43b	112	static const struct backlight_ops cr_backlight_ops = {
dbe7e429 AH	113	.get_brightness = cr_backlight_get_intensity,
	114	.update_status = cr_backlight_set_intensity,
	115	};
	116
	117	static void cr_panel_on(void)
	118	{
	119	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	120	u32 cur = inl(addr);
	121
	122	if (!(cur & CRVML_PANEL_ON)) {
	123	/* Make sure LVDS controller is down. */
	124	if (cur & 0x00000001) {
	125	cur &= ~CRVML_LVDS_ON;
	126	outl(cur, addr);
	127	}
	128	/* Power up Panel */
	129	schedule_timeout(HZ / 10);
	130	cur \|= CRVML_PANEL_ON;
	131	outl(cur, addr);
	132	}
	133
	134	/* Power up LVDS controller */
	135
	136	if (!(cur & CRVML_LVDS_ON)) {
	137	schedule_timeout(HZ / 10);
	138	outl(cur \| CRVML_LVDS_ON, addr);
	139	}
	140	}
	141
	142	static void cr_panel_off(void)
	143	{
	144	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	145	u32 cur = inl(addr);
	146
	147	/* Power down LVDS controller first to avoid high currents */
	148	if (cur & CRVML_LVDS_ON) {
	149	cur &= ~CRVML_LVDS_ON;
	150	outl(cur, addr);
	151	}
	152	if (cur & CRVML_PANEL_ON) {
	153	schedule_timeout(HZ / 10);
	154	outl(cur & ~CRVML_PANEL_ON, addr);
	155	}
	156	}
	157
	158	static int cr_lcd_set_power(struct lcd_device *ld, int power)
	159	{
	160	if (power == FB_BLANK_UNBLANK)
	161	cr_panel_on();
	162	if (power == FB_BLANK_POWERDOWN)
	163	cr_panel_off();
	164
	165	return 0;
	166	}
	167
	168	static struct lcd_ops cr_lcd_ops = {
	169	.set_power = cr_lcd_set_power,
	170	};
	171
	172	static int cr_backlight_probe(struct platform_device *pdev)
	173	{
a19a6ee6	174	struct backlight_properties props;
0b75f2df JJ	175	struct backlight_device *bdp;
0b75f2df JJ	176	struct lcd_device *ldp;
dbe7e429 AH	177	struct cr_panel *crp;
	178	u8 dev_en;
	179
dbe7e429 AH	180	lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
	181	CRVML_DEVICE_LPC, NULL);
	182	if (!lpc_dev) {
	183	printk("INTEL CARILLO RANCH LPC not found.\n");
	184	return -ENODEV;
	185	}
	186
	187	pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
	188	if (!(dev_en & CRVML_GPIOEN_BIT)) {
	189	printk(KERN_ERR
	190	"Carillo Ranch GPIO device was not enabled.\n");
	191	pci_dev_put(lpc_dev);
	192	return -ENODEV;
	193	}
	194
a19a6ee6 MG	195	memset(&props, 0, sizeof(struct backlight_properties));
	196	bdp = backlight_device_register("cr-backlight", &pdev->dev, NULL,
	197	&cr_backlight_ops, &props);
0b75f2df	198	if (IS_ERR(bdp)) {
dbe7e429	199	pci_dev_put(lpc_dev);
0b75f2df	200	return PTR_ERR(bdp);
dbe7e429 AH	201	}
dbe7e429 AH	202
0b75f2df JJ	203	ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops);
	204	if (IS_ERR(ldp)) {
	205	backlight_device_unregister(bdp);
dbe7e429	206	pci_dev_put(lpc_dev);
5b0582ea	207	return PTR_ERR(ldp);
dbe7e429 AH	208	}
	209
	210	pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
	211	&gpio_bar);
	212	gpio_bar &= ~0x3F;
	213
0b75f2df JJ	214	crp = kzalloc(sizeof(*crp), GFP_KERNEL);
	215	if (!crp) {
	216	lcd_device_unregister(ldp);
	217	backlight_device_unregister(bdp);
	218	pci_dev_put(lpc_dev);
	219	return -ENOMEM;
	220	}
	221
	222	crp->cr_backlight_device = bdp;
	223	crp->cr_lcd_device = ldp;
dbe7e429 AH	224	crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
dbe7e429 AH	225	crp->cr_backlight_device->props.brightness = 0;
dbe7e429	226	cr_backlight_set_intensity(crp->cr_backlight_device);
dbe7e429 AH	227	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);
	228
	229	platform_set_drvdata(pdev, crp);
	230
	231	return 0;
	232	}
	233
	234	static int cr_backlight_remove(struct platform_device *pdev)
	235	{
	236	struct cr_panel *crp = platform_get_drvdata(pdev);
	237	crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
	238	crp->cr_backlight_device->props.brightness = 0;
	239	crp->cr_backlight_device->props.max_brightness = 0;
	240	cr_backlight_set_intensity(crp->cr_backlight_device);
	241	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
	242	backlight_device_unregister(crp->cr_backlight_device);
	243	lcd_device_unregister(crp->cr_lcd_device);
	244	pci_dev_put(lpc_dev);
	245
	246	return 0;
	247	}
	248
	249	static struct platform_driver cr_backlight_driver = {
	250	.probe = cr_backlight_probe,
	251	.remove = cr_backlight_remove,
	252	.driver = {
	253	.name = "cr_backlight",
	254	},
	255	};
	256
	257	static struct platform_device *crp;
	258
	259	static int __init cr_backlight_init(void)
	260	{
	261	int ret = platform_driver_register(&cr_backlight_driver);
	262
b4a11d3d AM	263	if (ret)
b4a11d3d AM	264	return ret;
dbe7e429	265
b4a11d3d AM	266	crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
	267	if (IS_ERR(crp)) {
	268	platform_driver_unregister(&cr_backlight_driver);
	269	return PTR_ERR(crp);
dbe7e429 AH	270	}
	271
	272	printk("Carillo Ranch Backlight Driver Initialized.\n");
	273
b4a11d3d	274	return 0;
dbe7e429 AH	275	}
	276
	277	static void __exit cr_backlight_exit(void)
	278	{
	279	platform_device_unregister(crp);
	280	platform_driver_unregister(&cr_backlight_driver);
	281	}
	282
	283	module_init(cr_backlight_init);
	284	module_exit(cr_backlight_exit);
	285
	286	MODULE_AUTHOR("Tungsten Graphics Inc.");
	287	MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
	288	MODULE_LICENSE("GPL");