diff options
author | Haojian Zhuang <haojian.zhuang@marvell.com> | 2009-12-18 10:01:45 -0500 |
---|---|---|
committer | Samuel Ortiz <sameo@linux.intel.com> | 2010-03-07 16:17:08 -0500 |
commit | 4f811ef0d40048ae80b6ea77080b814725bffc58 (patch) | |
tree | 497168c5c8059bed17c50c8b44d9691e5634f8bb | |
parent | 1ad998934e9c6cbae91662a05e0cb8772b1f4f75 (diff) |
backlight: Enable max8925 backlight
Enable max8925 backlight sub device.
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r-- | drivers/video/backlight/Kconfig | 7 | ||||
-rw-r--r-- | drivers/video/backlight/Makefile | 1 | ||||
-rw-r--r-- | drivers/video/backlight/max8925_bl.c | 200 |
3 files changed, 208 insertions, 0 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 96a6b3060ac0..0c77fc610212 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig | |||
@@ -212,6 +212,13 @@ config BACKLIGHT_DA903X | |||
212 | If you have a LCD backlight connected to the WLED output of DA9030 | 212 | If you have a LCD backlight connected to the WLED output of DA9030 |
213 | or DA9034 WLED output, say Y here to enable this driver. | 213 | or DA9034 WLED output, say Y here to enable this driver. |
214 | 214 | ||
215 | config BACKLIGHT_MAX8925 | ||
216 | tristate "Backlight driver for MAX8925" | ||
217 | depends on BACKLIGHT_CLASS_DEVICE && MFD_MAX8925 | ||
218 | help | ||
219 | If you have a LCD backlight connected to the WLED output of MAX8925 | ||
220 | WLED output, say Y here to enable this driver. | ||
221 | |||
215 | config BACKLIGHT_MBP_NVIDIA | 222 | config BACKLIGHT_MBP_NVIDIA |
216 | tristate "MacBook Pro Nvidia Backlight Driver" | 223 | tristate "MacBook Pro Nvidia Backlight Driver" |
217 | depends on BACKLIGHT_CLASS_DEVICE && X86 | 224 | depends on BACKLIGHT_CLASS_DEVICE && X86 |
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 802d467b08c0..6c704d41462d 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile | |||
@@ -22,6 +22,7 @@ obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o | |||
22 | obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o | 22 | obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o |
23 | obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o | 23 | obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o |
24 | obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o | 24 | obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o |
25 | obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o | ||
25 | obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o | 26 | obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o |
26 | obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o | 27 | obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o |
27 | obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o | 28 | obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o |
diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c new file mode 100644 index 000000000000..c267069a52a3 --- /dev/null +++ b/drivers/video/backlight/max8925_bl.c | |||
@@ -0,0 +1,200 @@ | |||
1 | /* | ||
2 | * Backlight driver for Maxim MAX8925 | ||
3 | * | ||
4 | * Copyright (C) 2009 Marvell International Ltd. | ||
5 | * Haojian Zhuang <haojian.zhuang@marvell.com> | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | */ | ||
11 | |||
12 | #include <linux/init.h> | ||
13 | #include <linux/kernel.h> | ||
14 | #include <linux/platform_device.h> | ||
15 | #include <linux/fb.h> | ||
16 | #include <linux/i2c.h> | ||
17 | #include <linux/backlight.h> | ||
18 | #include <linux/mfd/max8925.h> | ||
19 | |||
20 | #define MAX_BRIGHTNESS (0xff) | ||
21 | #define MIN_BRIGHTNESS (0) | ||
22 | |||
23 | #define LWX_FREQ(x) (((x - 601) / 100) & 0x7) | ||
24 | |||
25 | struct max8925_backlight_data { | ||
26 | struct max8925_chip *chip; | ||
27 | |||
28 | int current_brightness; | ||
29 | }; | ||
30 | |||
31 | static int max8925_backlight_set(struct backlight_device *bl, int brightness) | ||
32 | { | ||
33 | struct max8925_backlight_data *data = bl_get_data(bl); | ||
34 | struct max8925_chip *chip = data->chip; | ||
35 | unsigned char value; | ||
36 | int ret; | ||
37 | |||
38 | if (brightness > MAX_BRIGHTNESS) | ||
39 | value = MAX_BRIGHTNESS; | ||
40 | else | ||
41 | value = brightness; | ||
42 | |||
43 | ret = max8925_reg_write(chip->i2c, MAX8925_WLED_CNTL, value); | ||
44 | if (ret < 0) | ||
45 | goto out; | ||
46 | |||
47 | if (!data->current_brightness && brightness) | ||
48 | /* enable WLED output */ | ||
49 | ret = max8925_set_bits(chip->i2c, MAX8925_WLED_MODE_CNTL, 1, 1); | ||
50 | else if (!brightness) | ||
51 | /* disable WLED output */ | ||
52 | ret = max8925_set_bits(chip->i2c, MAX8925_WLED_MODE_CNTL, 1, 0); | ||
53 | if (ret < 0) | ||
54 | goto out; | ||
55 | dev_dbg(chip->dev, "set brightness %d\n", value); | ||
56 | data->current_brightness = value; | ||
57 | return 0; | ||
58 | out: | ||
59 | dev_dbg(chip->dev, "set brightness %d failure with return value:%d\n", | ||
60 | value, ret); | ||
61 | return ret; | ||
62 | } | ||
63 | |||
64 | static int max8925_backlight_update_status(struct backlight_device *bl) | ||
65 | { | ||
66 | int brightness = bl->props.brightness; | ||
67 | |||
68 | if (bl->props.power != FB_BLANK_UNBLANK) | ||
69 | brightness = 0; | ||
70 | |||
71 | if (bl->props.fb_blank != FB_BLANK_UNBLANK) | ||
72 | brightness = 0; | ||
73 | |||
74 | if (bl->props.state & BL_CORE_SUSPENDED) | ||
75 | brightness = 0; | ||
76 | |||
77 | return max8925_backlight_set(bl, brightness); | ||
78 | } | ||
79 | |||
80 | static int max8925_backlight_get_brightness(struct backlight_device *bl) | ||
81 | { | ||
82 | struct max8925_backlight_data *data = bl_get_data(bl); | ||
83 | struct max8925_chip *chip = data->chip; | ||
84 | int ret; | ||
85 | |||
86 | ret = max8925_reg_read(chip->i2c, MAX8925_WLED_CNTL); | ||
87 | if (ret < 0) | ||
88 | return -EINVAL; | ||
89 | data->current_brightness = ret; | ||
90 | dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness); | ||
91 | return ret; | ||
92 | } | ||
93 | |||
94 | static struct backlight_ops max8925_backlight_ops = { | ||
95 | .options = BL_CORE_SUSPENDRESUME, | ||
96 | .update_status = max8925_backlight_update_status, | ||
97 | .get_brightness = max8925_backlight_get_brightness, | ||
98 | }; | ||
99 | |||
100 | static int __devinit max8925_backlight_probe(struct platform_device *pdev) | ||
101 | { | ||
102 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | ||
103 | struct max8925_platform_data *max8925_pdata; | ||
104 | struct max8925_backlight_pdata *pdata = NULL; | ||
105 | struct max8925_backlight_data *data; | ||
106 | struct backlight_device *bl; | ||
107 | struct resource *res; | ||
108 | char name[MAX8925_NAME_SIZE]; | ||
109 | unsigned char value; | ||
110 | int ret; | ||
111 | |||
112 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | ||
113 | if (res == NULL) { | ||
114 | dev_err(&pdev->dev, "No I/O resource!\n"); | ||
115 | return -EINVAL; | ||
116 | } | ||
117 | |||
118 | if (pdev->dev.parent->platform_data) { | ||
119 | max8925_pdata = pdev->dev.parent->platform_data; | ||
120 | pdata = max8925_pdata->backlight; | ||
121 | } | ||
122 | |||
123 | if (!pdata) { | ||
124 | dev_err(&pdev->dev, "platform data isn't assigned to " | ||
125 | "backlight\n"); | ||
126 | return -EINVAL; | ||
127 | } | ||
128 | |||
129 | data = kzalloc(sizeof(struct max8925_backlight_data), GFP_KERNEL); | ||
130 | if (data == NULL) | ||
131 | return -ENOMEM; | ||
132 | strncpy(name, res->name, MAX8925_NAME_SIZE); | ||
133 | data->chip = chip; | ||
134 | data->current_brightness = 0; | ||
135 | |||
136 | bl = backlight_device_register(name, &pdev->dev, data, | ||
137 | &max8925_backlight_ops); | ||
138 | if (IS_ERR(bl)) { | ||
139 | dev_err(&pdev->dev, "failed to register backlight\n"); | ||
140 | kfree(data); | ||
141 | return PTR_ERR(bl); | ||
142 | } | ||
143 | bl->props.max_brightness = MAX_BRIGHTNESS; | ||
144 | bl->props.brightness = MAX_BRIGHTNESS; | ||
145 | |||
146 | platform_set_drvdata(pdev, bl); | ||
147 | |||
148 | value = 0; | ||
149 | if (pdata->lxw_scl) | ||
150 | value |= (1 << 7); | ||
151 | if (pdata->lxw_freq) | ||
152 | value |= (LWX_FREQ(pdata->lxw_freq) << 4); | ||
153 | if (pdata->dual_string) | ||
154 | value |= (1 << 1); | ||
155 | ret = max8925_set_bits(chip->i2c, MAX8925_WLED_MODE_CNTL, 0xfe, value); | ||
156 | if (ret < 0) | ||
157 | goto out; | ||
158 | |||
159 | backlight_update_status(bl); | ||
160 | return 0; | ||
161 | out: | ||
162 | kfree(data); | ||
163 | return ret; | ||
164 | } | ||
165 | |||
166 | static int __devexit max8925_backlight_remove(struct platform_device *pdev) | ||
167 | { | ||
168 | struct backlight_device *bl = platform_get_drvdata(pdev); | ||
169 | struct max8925_backlight_data *data = bl_get_data(bl); | ||
170 | |||
171 | backlight_device_unregister(bl); | ||
172 | kfree(data); | ||
173 | return 0; | ||
174 | } | ||
175 | |||
176 | static struct platform_driver max8925_backlight_driver = { | ||
177 | .driver = { | ||
178 | .name = "max8925-backlight", | ||
179 | .owner = THIS_MODULE, | ||
180 | }, | ||
181 | .probe = max8925_backlight_probe, | ||
182 | .remove = __devexit_p(max8925_backlight_remove), | ||
183 | }; | ||
184 | |||
185 | static int __init max8925_backlight_init(void) | ||
186 | { | ||
187 | return platform_driver_register(&max8925_backlight_driver); | ||
188 | } | ||
189 | module_init(max8925_backlight_init); | ||
190 | |||
191 | static void __exit max8925_backlight_exit(void) | ||
192 | { | ||
193 | platform_driver_unregister(&max8925_backlight_driver); | ||
194 | }; | ||
195 | module_exit(max8925_backlight_exit); | ||
196 | |||
197 | MODULE_DESCRIPTION("Backlight Driver for Maxim MAX8925"); | ||
198 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | ||
199 | MODULE_LICENSE("GPL"); | ||
200 | MODULE_ALIAS("platform:max8925-backlight"); | ||