aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/backlight
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/video/backlight')
-rw-r--r--drivers/video/backlight/adx_bl.c182
-rw-r--r--drivers/video/backlight/progear_bl.c160
-rw-r--r--drivers/video/backlight/tegra_pwm_bl.c177
3 files changed, 519 insertions, 0 deletions
diff --git a/drivers/video/backlight/adx_bl.c b/drivers/video/backlight/adx_bl.c
new file mode 100644
index 00000000000..c861c41af44
--- /dev/null
+++ b/drivers/video/backlight/adx_bl.c
@@ -0,0 +1,182 @@
1/*
2 * linux/drivers/video/backlight/adx.c
3 *
4 * Copyright (C) 2009 Avionic Design GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Written by Thierry Reding <thierry.reding@avionic-design.de>
11 */
12
13#include <linux/backlight.h>
14#include <linux/fb.h>
15#include <linux/gfp.h>
16#include <linux/io.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19
20/* register definitions */
21#define ADX_BACKLIGHT_CONTROL 0x00
22#define ADX_BACKLIGHT_CONTROL_ENABLE (1 << 0)
23#define ADX_BACKLIGHT_BRIGHTNESS 0x08
24#define ADX_BACKLIGHT_STATUS 0x10
25#define ADX_BACKLIGHT_ERROR 0x18
26
27struct adxbl {
28 void __iomem *base;
29};
30
31static int adx_backlight_update_status(struct backlight_device *bldev)
32{
33 struct adxbl *bl = bl_get_data(bldev);
34 u32 value;
35
36 value = bldev->props.brightness;
37 writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);
38
39 value = readl(bl->base + ADX_BACKLIGHT_CONTROL);
40
41 if (bldev->props.state & BL_CORE_FBBLANK)
42 value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
43 else
44 value |= ADX_BACKLIGHT_CONTROL_ENABLE;
45
46 writel(value, bl->base + ADX_BACKLIGHT_CONTROL);
47
48 return 0;
49}
50
51static int adx_backlight_get_brightness(struct backlight_device *bldev)
52{
53 struct adxbl *bl = bl_get_data(bldev);
54 u32 brightness;
55
56 brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
57 return brightness & 0xff;
58}
59
60static int adx_backlight_check_fb(struct backlight_device *bldev, struct fb_info *fb)
61{
62 return 1;
63}
64
65static const struct backlight_ops adx_backlight_ops = {
66 .options = 0,
67 .update_status = adx_backlight_update_status,
68 .get_brightness = adx_backlight_get_brightness,
69 .check_fb = adx_backlight_check_fb,
70};
71
72static int __devinit adx_backlight_probe(struct platform_device *pdev)
73{
74 struct backlight_properties props;
75 struct backlight_device *bldev;
76 struct resource *res;
77 struct adxbl *bl;
78 int ret = 0;
79
80 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
81 if (!res) {
82 ret = -ENXIO;
83 goto out;
84 }
85
86 res = devm_request_mem_region(&pdev->dev, res->start,
87 resource_size(res), res->name);
88 if (!res) {
89 ret = -ENXIO;
90 goto out;
91 }
92
93 bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
94 if (!bl) {
95 ret = -ENOMEM;
96 goto out;
97 }
98
99 bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
100 resource_size(res));
101 if (!bl->base) {
102 ret = -ENXIO;
103 goto out;
104 }
105
106 memset(&props, 0, sizeof(struct backlight_properties));
107 props.type = BACKLIGHT_RAW;
108 props.max_brightness = 0xff;
109 bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev,
110 bl, &adx_backlight_ops, &props);
111 if (IS_ERR(bldev)) {
112 ret = PTR_ERR(bldev);
113 goto out;
114 }
115
116 bldev->props.brightness = 0xff;
117 bldev->props.power = FB_BLANK_UNBLANK;
118
119 platform_set_drvdata(pdev, bldev);
120
121out:
122 return ret;
123}
124
125static int __devexit adx_backlight_remove(struct platform_device *pdev)
126{
127 struct backlight_device *bldev;
128 int ret = 0;
129
130 bldev = platform_get_drvdata(pdev);
131 bldev->props.power = FB_BLANK_UNBLANK;
132 bldev->props.brightness = 0xff;
133 backlight_update_status(bldev);
134 backlight_device_unregister(bldev);
135 platform_set_drvdata(pdev, NULL);
136
137 return ret;
138}
139
140#ifdef CONFIG_PM
141static int adx_backlight_suspend(struct platform_device *pdev,
142 pm_message_t state)
143{
144 return 0;
145}
146
147static int adx_backlight_resume(struct platform_device *pdev)
148{
149 return 0;
150}
151#else
152#define adx_backlight_suspend NULL
153#define adx_backlight_resume NULL
154#endif
155
156static struct platform_driver adx_backlight_driver = {
157 .probe = adx_backlight_probe,
158 .remove = __devexit_p(adx_backlight_remove),
159 .suspend = adx_backlight_suspend,
160 .resume = adx_backlight_resume,
161 .driver = {
162 .name = "adx-backlight",
163 .owner = THIS_MODULE,
164 },
165};
166
167static int __init adx_backlight_init(void)
168{
169 return platform_driver_register(&adx_backlight_driver);
170}
171
172static void __exit adx_backlight_exit(void)
173{
174 platform_driver_unregister(&adx_backlight_driver);
175}
176
177module_init(adx_backlight_init);
178module_exit(adx_backlight_exit);
179
180MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
181MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
182MODULE_LICENSE("GPL v2");
diff --git a/drivers/video/backlight/progear_bl.c b/drivers/video/backlight/progear_bl.c
new file mode 100644
index 00000000000..6af183d6465
--- /dev/null
+++ b/drivers/video/backlight/progear_bl.c
@@ -0,0 +1,160 @@
1/*
2 * Backlight Driver for Frontpath ProGear HX1050+
3 *
4 * Copyright (c) 2006 Marcin Juszkiewicz
5 *
6 * Based on Progear LCD driver by M Schacht
7 * <mschacht at alumni dot washington dot edu>
8 *
9 * Based on Sharp's Corgi Backlight Driver
10 * Based on Backlight Driver for HP Jornada 680
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/mutex.h>
23#include <linux/fb.h>
24#include <linux/backlight.h>
25#include <linux/pci.h>
26
27#define PMU_LPCR 0xB0
28#define SB_MPS1 0x61
29#define HW_LEVEL_MAX 0x77
30#define HW_LEVEL_MIN 0x4f
31
32static struct pci_dev *pmu_dev = NULL;
33static struct pci_dev *sb_dev = NULL;
34
35static int progearbl_set_intensity(struct backlight_device *bd)
36{
37 int intensity = bd->props.brightness;
38
39 if (bd->props.power != FB_BLANK_UNBLANK)
40 intensity = 0;
41 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
42 intensity = 0;
43
44 pci_write_config_byte(pmu_dev, PMU_LPCR, intensity + HW_LEVEL_MIN);
45
46 return 0;
47}
48
49static int progearbl_get_intensity(struct backlight_device *bd)
50{
51 u8 intensity;
52 pci_read_config_byte(pmu_dev, PMU_LPCR, &intensity);
53
54 return intensity - HW_LEVEL_MIN;
55}
56
57static const struct backlight_ops progearbl_ops = {
58 .get_brightness = progearbl_get_intensity,
59 .update_status = progearbl_set_intensity,
60};
61
62static int progearbl_probe(struct platform_device *pdev)
63{
64 struct backlight_properties props;
65 u8 temp;
66 struct backlight_device *progear_backlight_device;
67 int ret;
68
69 pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
70 if (!pmu_dev) {
71 printk("ALI M7101 PMU not found.\n");
72 return -ENODEV;
73 }
74
75 sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
76 if (!sb_dev) {
77 printk("ALI 1533 SB not found.\n");
78 ret = -ENODEV;
79 goto put_pmu;
80 }
81
82 /* Set SB_MPS1 to enable brightness control. */
83 pci_read_config_byte(sb_dev, SB_MPS1, &temp);
84 pci_write_config_byte(sb_dev, SB_MPS1, temp | 0x20);
85
86 memset(&props, 0, sizeof(struct backlight_properties));
87 props.type = BACKLIGHT_RAW;
88 props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
89 progear_backlight_device = backlight_device_register("progear-bl",
90 &pdev->dev, NULL,
91 &progearbl_ops,
92 &props);
93 if (IS_ERR(progear_backlight_device)) {
94 ret = PTR_ERR(progear_backlight_device);
95 goto put_sb;
96 }
97
98 platform_set_drvdata(pdev, progear_backlight_device);
99
100 progear_backlight_device->props.power = FB_BLANK_UNBLANK;
101 progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
102 progearbl_set_intensity(progear_backlight_device);
103
104 return 0;
105put_sb:
106 pci_dev_put(sb_dev);
107put_pmu:
108 pci_dev_put(pmu_dev);
109 return ret;
110}
111
112static int progearbl_remove(struct platform_device *pdev)
113{
114 struct backlight_device *bd = platform_get_drvdata(pdev);
115 backlight_device_unregister(bd);
116
117 return 0;
118}
119
120static struct platform_driver progearbl_driver = {
121 .probe = progearbl_probe,
122 .remove = progearbl_remove,
123 .driver = {
124 .name = "progear-bl",
125 },
126};
127
128static struct platform_device *progearbl_device;
129
130static int __init progearbl_init(void)
131{
132 int ret = platform_driver_register(&progearbl_driver);
133
134 if (ret)
135 return ret;
136 progearbl_device = platform_device_register_simple("progear-bl", -1,
137 NULL, 0);
138 if (IS_ERR(progearbl_device)) {
139 platform_driver_unregister(&progearbl_driver);
140 return PTR_ERR(progearbl_device);
141 }
142
143 return 0;
144}
145
146static void __exit progearbl_exit(void)
147{
148 pci_dev_put(pmu_dev);
149 pci_dev_put(sb_dev);
150
151 platform_device_unregister(progearbl_device);
152 platform_driver_unregister(&progearbl_driver);
153}
154
155module_init(progearbl_init);
156module_exit(progearbl_exit);
157
158MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
159MODULE_DESCRIPTION("ProGear Backlight Driver");
160MODULE_LICENSE("GPL");
diff --git a/drivers/video/backlight/tegra_pwm_bl.c b/drivers/video/backlight/tegra_pwm_bl.c
new file mode 100644
index 00000000000..4be691c54d3
--- /dev/null
+++ b/drivers/video/backlight/tegra_pwm_bl.c
@@ -0,0 +1,177 @@
1/*
2 * linux/drivers/video/backlight/tegra_pwm_bl.c
3 *
4 * Tegra pwm backlight driver
5 *
6 * Copyright (C) 2011 NVIDIA Corporation
7 * Author: Renuka Apte <rapte@nvidia.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/platform_device.h>
18#include <linux/fb.h>
19#include <linux/backlight.h>
20#include <linux/err.h>
21#include <linux/slab.h>
22#include <linux/tegra_pwm_bl.h>
23#include <mach/dc.h>
24
25struct tegra_pwm_bl_data {
26 struct device *dev;
27 int which_dc;
28 int (*notify)(struct device *, int brightness);
29 struct tegra_dc_pwm_params params;
30 int (*check_fb)(struct device *dev, struct fb_info *info);
31};
32
33static int tegra_pwm_backlight_update_status(struct backlight_device *bl)
34{
35 struct tegra_pwm_bl_data *tbl = dev_get_drvdata(&bl->dev);
36 int brightness = bl->props.brightness;
37 int max = bl->props.max_brightness;
38 struct tegra_dc *dc;
39
40 if (bl->props.power != FB_BLANK_UNBLANK)
41 brightness = 0;
42
43 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
44 brightness = 0;
45
46 if (tbl->notify)
47 brightness = tbl->notify(tbl->dev, brightness);
48
49 if (brightness > max)
50 dev_err(&bl->dev, "Invalid brightness value: %d max: %d\n",
51 brightness, max);
52
53#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
54 /* map API brightness range from (0~255) to hw range (0~128) */
55 tbl->params.duty_cycle = (brightness * 128) / 255;
56#else
57 tbl->params.duty_cycle = brightness & 0xFF;
58#endif
59
60 /* Call tegra display controller function to update backlight */
61 dc = tegra_dc_get_dc(tbl->which_dc);
62 if (dc)
63 tegra_dc_config_pwm(dc, &tbl->params);
64 else
65 dev_err(&bl->dev, "tegra display controller not available\n");
66
67 return 0;
68}
69
70static int tegra_pwm_backlight_get_brightness(struct backlight_device *bl)
71{
72 return bl->props.brightness;
73}
74
75static int tegra_pwm_backlight_check_fb(struct backlight_device *bl,
76 struct fb_info *info)
77{
78 struct tegra_pwm_bl_data *tbl = dev_get_drvdata(&bl->dev);
79 return !tbl->check_fb || tbl->check_fb(tbl->dev, info);
80}
81
82static const struct backlight_ops tegra_pwm_backlight_ops = {
83 .update_status = tegra_pwm_backlight_update_status,
84 .get_brightness = tegra_pwm_backlight_get_brightness,
85 .check_fb = tegra_pwm_backlight_check_fb,
86};
87
88static int tegra_pwm_backlight_probe(struct platform_device *pdev)
89{
90 struct backlight_properties props;
91 struct platform_tegra_pwm_backlight_data *data;
92 struct backlight_device *bl;
93 struct tegra_pwm_bl_data *tbl;
94 int ret;
95
96 data = pdev->dev.platform_data;
97 if (!data) {
98 dev_err(&pdev->dev, "failed to find platform data\n");
99 return -EINVAL;
100 }
101
102 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
103 if (!tbl) {
104 dev_err(&pdev->dev, "no memory for state\n");
105 ret = -ENOMEM;
106 goto err_alloc;
107 }
108
109 tbl->dev = &pdev->dev;
110 tbl->which_dc = data->which_dc;
111 tbl->notify = data->notify;
112 tbl->check_fb = data->check_fb;
113 tbl->params.which_pwm = data->which_pwm;
114 tbl->params.gpio_conf_to_sfio = data->gpio_conf_to_sfio;
115 tbl->params.switch_to_sfio = data->switch_to_sfio;
116 tbl->params.period = data->period;
117 tbl->params.clk_div = data->clk_div;
118 tbl->params.clk_select = data->clk_select;
119
120 memset(&props, 0, sizeof(struct backlight_properties));
121 props.type = BACKLIGHT_RAW;
122 props.max_brightness = data->max_brightness;
123 bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, tbl,
124 &tegra_pwm_backlight_ops, &props);
125 if (IS_ERR(bl)) {
126 dev_err(&pdev->dev, "failed to register backlight\n");
127 ret = PTR_ERR(bl);
128 goto err_bl;
129 }
130
131 bl->props.brightness = data->dft_brightness;
132 backlight_update_status(bl);
133
134 platform_set_drvdata(pdev, bl);
135 return 0;
136
137err_bl:
138 kfree(tbl);
139err_alloc:
140 return ret;
141}
142
143static int tegra_pwm_backlight_remove(struct platform_device *pdev)
144{
145 struct backlight_device *bl = platform_get_drvdata(pdev);
146 struct tegra_pwm_bl_data *tbl = dev_get_drvdata(&bl->dev);
147
148 backlight_device_unregister(bl);
149 kfree(tbl);
150 return 0;
151}
152
153static struct platform_driver tegra_pwm_backlight_driver = {
154 .driver = {
155 .name = "tegra-pwm-bl",
156 .owner = THIS_MODULE,
157 },
158 .probe = tegra_pwm_backlight_probe,
159 .remove = tegra_pwm_backlight_remove,
160};
161
162static int __init tegra_pwm_backlight_init(void)
163{
164 return platform_driver_register(&tegra_pwm_backlight_driver);
165}
166late_initcall(tegra_pwm_backlight_init);
167
168static void __exit tegra_pwm_backlight_exit(void)
169{
170 platform_driver_unregister(&tegra_pwm_backlight_driver);
171}
172module_exit(tegra_pwm_backlight_exit);
173
174MODULE_DESCRIPTION("Tegra PWM Backlight Driver");
175MODULE_LICENSE("GPL");
176MODULE_ALIAS("platform:tegra-pwm-backlight");
177
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-19 16:02:24 -0400