[GitHub/mt8127/android_kernel_alcatel_ttab.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>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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) {
		pr_err("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)) {
		pr_err("Carillo Ranch GPIO device was not enabled.\n");
		pci_dev_put(lpc_dev);
		return -ENODEV;
	}

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	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 = devm_kzalloc(&pdev->dev, 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);
	}

	pr_info("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
31e6432b JH	30	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31e6432b JH	31
dbe7e429 AH	32	#include <linux/module.h>
	33	#include <linux/kernel.h>
	34	#include <linux/init.h>
	35	#include <linux/platform_device.h>
	36	#include <linux/mutex.h>
	37	#include <linux/fb.h>
	38	#include <linux/backlight.h>
	39	#include <linux/lcd.h>
	40	#include <linux/pci.h>
5a0e3ad6	41	#include <linux/slab.h>
dbe7e429 AH	42
	43	/* The LVDS- and panel power controls sits on the
	44	* GPIO port of the ISA bridge.
	45	*/
	46
	47	#define CRVML_DEVICE_LPC 0x27B8
	48	#define CRVML_REG_GPIOBAR 0x48
	49	#define CRVML_REG_GPIOEN 0x4C
	50	#define CRVML_GPIOEN_BIT (1 << 4)
	51	#define CRVML_PANEL_PORT 0x38
	52	#define CRVML_LVDS_ON 0x00000001
	53	#define CRVML_PANEL_ON 0x00000002
	54	#define CRVML_BACKLIGHT_OFF 0x00000004
	55
	56	/* The PLL Clock register sits on Host bridge */
	57	#define CRVML_DEVICE_MCH 0x5001
	58	#define CRVML_REG_MCHBAR 0x44
	59	#define CRVML_REG_MCHEN 0x54
	60	#define CRVML_MCHEN_BIT (1 << 28)
	61	#define CRVML_MCHMAP_SIZE 4096
	62	#define CRVML_REG_CLOCK 0xc3c
	63	#define CRVML_CLOCK_SHIFT 8
	64	#define CRVML_CLOCK_MASK 0x00000f00
	65
	66	static struct pci_dev *lpc_dev;
	67	static u32 gpio_bar;
	68
	69	struct cr_panel {
	70	struct backlight_device *cr_backlight_device;
	71	struct lcd_device *cr_lcd_device;
	72	};
	73
	74	static int cr_backlight_set_intensity(struct backlight_device *bd)
	75	{
	76	int intensity = bd->props.brightness;
	77	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	78	u32 cur = inl(addr);
	79
	80	if (bd->props.power == FB_BLANK_UNBLANK)
	81	intensity = FB_BLANK_UNBLANK;
	82	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
	83	intensity = FB_BLANK_UNBLANK;
	84	if (bd->props.power == FB_BLANK_POWERDOWN)
	85	intensity = FB_BLANK_POWERDOWN;
	86	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
	87	intensity = FB_BLANK_POWERDOWN;
	88
	89	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
	90	cur &= ~CRVML_BACKLIGHT_OFF;
	91	outl(cur, addr);
	92	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
	93	cur \|= CRVML_BACKLIGHT_OFF;
	94	outl(cur, addr);
	95	} /* anything else, don't bother */
	96
	97	return 0;
	98	}
	99
	100	static int cr_backlight_get_intensity(struct backlight_device *bd)
	101	{
	102	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	103	u32 cur = inl(addr);
	104	u8 intensity;
	105
106	if (cur & CRVML_BACKLIGHT_OFF)
107	intensity = FB_BLANK_POWERDOWN;
108	else
109	intensity = FB_BLANK_UNBLANK;
110
111	return intensity;
112	}
113
9905a43b	114	static const struct backlight_ops cr_backlight_ops = {
dbe7e429 AH	115	.get_brightness = cr_backlight_get_intensity,
	116	.update_status = cr_backlight_set_intensity,
	117	};
	118
	119	static void cr_panel_on(void)
	120	{
	121	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	122	u32 cur = inl(addr);
	123
	124	if (!(cur & CRVML_PANEL_ON)) {
	125	/* Make sure LVDS controller is down. */
	126	if (cur & 0x00000001) {
	127	cur &= ~CRVML_LVDS_ON;
	128	outl(cur, addr);
	129	}
	130	/* Power up Panel */
	131	schedule_timeout(HZ / 10);
	132	cur \|= CRVML_PANEL_ON;
	133	outl(cur, addr);
	134	}
	135
	136	/* Power up LVDS controller */
	137
	138	if (!(cur & CRVML_LVDS_ON)) {
	139	schedule_timeout(HZ / 10);
	140	outl(cur \| CRVML_LVDS_ON, addr);
	141	}
	142	}
	143
	144	static void cr_panel_off(void)
	145	{
	146	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	147	u32 cur = inl(addr);
	148
	149	/* Power down LVDS controller first to avoid high currents */
	150	if (cur & CRVML_LVDS_ON) {
	151	cur &= ~CRVML_LVDS_ON;
	152	outl(cur, addr);
	153	}
	154	if (cur & CRVML_PANEL_ON) {
	155	schedule_timeout(HZ / 10);
	156	outl(cur & ~CRVML_PANEL_ON, addr);
	157	}
	158	}
	159
	160	static int cr_lcd_set_power(struct lcd_device *ld, int power)
	161	{
	162	if (power == FB_BLANK_UNBLANK)
	163	cr_panel_on();
	164	if (power == FB_BLANK_POWERDOWN)
	165	cr_panel_off();
	166
	167	return 0;
	168	}
	169
	170	static struct lcd_ops cr_lcd_ops = {
	171	.set_power = cr_lcd_set_power,
	172	};
	173
	174	static int cr_backlight_probe(struct platform_device *pdev)
	175	{
a19a6ee6	176	struct backlight_properties props;
0b75f2df JJ	177	struct backlight_device *bdp;
0b75f2df JJ	178	struct lcd_device *ldp;
dbe7e429 AH	179	struct cr_panel *crp;
	180	u8 dev_en;
	181
dbe7e429 AH	182	lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
	183	CRVML_DEVICE_LPC, NULL);
	184	if (!lpc_dev) {
31e6432b	185	pr_err("INTEL CARILLO RANCH LPC not found.\n");
dbe7e429 AH	186	return -ENODEV;
	187	}
	188
	189	pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
	190	if (!(dev_en & CRVML_GPIOEN_BIT)) {
31e6432b	191	pr_err("Carillo Ranch GPIO device was not enabled.\n");
dbe7e429 AH	192	pci_dev_put(lpc_dev);
	193	return -ENODEV;
	194	}
	195
a19a6ee6	196	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	197	props.type = BACKLIGHT_RAW;
a19a6ee6 MG	198	bdp = backlight_device_register("cr-backlight", &pdev->dev, NULL,
a19a6ee6 MG	199	&cr_backlight_ops, &props);
0b75f2df	200	if (IS_ERR(bdp)) {
dbe7e429	201	pci_dev_put(lpc_dev);
0b75f2df	202	return PTR_ERR(bdp);
dbe7e429 AH	203	}
dbe7e429 AH	204
0b75f2df JJ	205	ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops);
	206	if (IS_ERR(ldp)) {
	207	backlight_device_unregister(bdp);
dbe7e429	208	pci_dev_put(lpc_dev);
5b0582ea	209	return PTR_ERR(ldp);
dbe7e429 AH	210	}
	211
	212	pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
	213	&gpio_bar);
	214	gpio_bar &= ~0x3F;
	215
ce969228	216	crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL);
0b75f2df JJ	217	if (!crp) {
	218	lcd_device_unregister(ldp);
	219	backlight_device_unregister(bdp);
	220	pci_dev_put(lpc_dev);
	221	return -ENOMEM;
	222	}
	223
	224	crp->cr_backlight_device = bdp;
	225	crp->cr_lcd_device = ldp;
dbe7e429 AH	226	crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
dbe7e429 AH	227	crp->cr_backlight_device->props.brightness = 0;
dbe7e429	228	cr_backlight_set_intensity(crp->cr_backlight_device);
dbe7e429 AH	229	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);
	230
	231	platform_set_drvdata(pdev, crp);
	232
	233	return 0;
	234	}
	235
	236	static int cr_backlight_remove(struct platform_device *pdev)
	237	{
	238	struct cr_panel *crp = platform_get_drvdata(pdev);
	239	crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
	240	crp->cr_backlight_device->props.brightness = 0;
	241	crp->cr_backlight_device->props.max_brightness = 0;
	242	cr_backlight_set_intensity(crp->cr_backlight_device);
	243	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
	244	backlight_device_unregister(crp->cr_backlight_device);
	245	lcd_device_unregister(crp->cr_lcd_device);
	246	pci_dev_put(lpc_dev);
	247
	248	return 0;
	249	}
	250
	251	static struct platform_driver cr_backlight_driver = {
	252	.probe = cr_backlight_probe,
	253	.remove = cr_backlight_remove,
	254	.driver = {
	255	.name = "cr_backlight",
	256	},
	257	};
	258
	259	static struct platform_device *crp;
	260
	261	static int __init cr_backlight_init(void)
	262	{
	263	int ret = platform_driver_register(&cr_backlight_driver);
	264
b4a11d3d AM	265	if (ret)
b4a11d3d AM	266	return ret;
dbe7e429	267
b4a11d3d AM	268	crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
	269	if (IS_ERR(crp)) {
	270	platform_driver_unregister(&cr_backlight_driver);
	271	return PTR_ERR(crp);
dbe7e429 AH	272	}
dbe7e429 AH	273
31e6432b	274	pr_info("Carillo Ranch Backlight Driver Initialized.\n");
dbe7e429	275
b4a11d3d	276	return 0;
dbe7e429 AH	277	}
	278
	279	static void __exit cr_backlight_exit(void)
	280	{
	281	platform_device_unregister(crp);
	282	platform_driver_unregister(&cr_backlight_driver);
	283	}
	284
	285	module_init(cr_backlight_init);
	286	module_exit(cr_backlight_exit);
	287
	288	MODULE_AUTHOR("Tungsten Graphics Inc.");
	289	MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
	290	MODULE_LICENSE("GPL");