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eb80411b KM |
1 | /* |
2 | * TI LP8788 MFD - keyled driver | |
3 | * | |
4 | * Copyright 2012 Texas Instruments | |
5 | * | |
6 | * Author: Milo(Woogyom) Kim <milo.kim@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/leds.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/mfd/lp8788.h> | |
21 | #include <linux/mfd/lp8788-isink.h> | |
22 | ||
23 | #define MAX_BRIGHTNESS LP8788_ISINK_MAX_PWM | |
24 | #define DEFAULT_LED_NAME "keyboard-backlight" | |
25 | ||
26 | struct lp8788_led { | |
27 | struct lp8788 *lp; | |
28 | struct mutex lock; | |
29 | struct work_struct work; | |
30 | struct led_classdev led_dev; | |
31 | enum lp8788_isink_number isink_num; | |
32 | enum led_brightness brightness; | |
33 | int on; | |
34 | }; | |
35 | ||
36 | struct lp8788_led_config { | |
37 | enum lp8788_isink_scale scale; | |
38 | enum lp8788_isink_number num; | |
39 | int iout; | |
40 | }; | |
41 | ||
42 | static struct lp8788_led_config default_led_config = { | |
43 | .scale = LP8788_ISINK_SCALE_100mA, | |
44 | .num = LP8788_ISINK_3, | |
45 | .iout = 0, | |
46 | }; | |
47 | ||
48 | static int lp8788_led_init_device(struct lp8788_led *led, | |
49 | struct lp8788_led_platform_data *pdata) | |
50 | { | |
51 | struct lp8788_led_config *cfg = &default_led_config; | |
52 | u8 addr, mask, val; | |
53 | int ret; | |
54 | ||
55 | if (pdata) { | |
56 | cfg->scale = pdata->scale; | |
57 | cfg->num = pdata->num; | |
58 | cfg->iout = pdata->iout_code; | |
59 | } | |
60 | ||
61 | led->isink_num = cfg->num; | |
62 | ||
63 | /* scale configuration */ | |
64 | addr = LP8788_ISINK_CTRL; | |
65 | mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET); | |
4df7309a | 66 | val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET); |
eb80411b KM |
67 | ret = lp8788_update_bits(led->lp, addr, mask, val); |
68 | if (ret) | |
69 | return ret; | |
70 | ||
71 | /* current configuration */ | |
72 | addr = lp8788_iout_addr[cfg->num]; | |
73 | mask = lp8788_iout_mask[cfg->num]; | |
74 | val = cfg->iout; | |
75 | ||
76 | return lp8788_update_bits(led->lp, addr, mask, val); | |
77 | } | |
78 | ||
79 | static void lp8788_led_enable(struct lp8788_led *led, | |
80 | enum lp8788_isink_number num, int on) | |
81 | { | |
82 | u8 mask = 1 << num; | |
83 | u8 val = on << num; | |
84 | ||
85 | if (lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val)) | |
86 | return; | |
87 | ||
88 | led->on = on; | |
89 | } | |
90 | ||
91 | static void lp8788_led_work(struct work_struct *work) | |
92 | { | |
93 | struct lp8788_led *led = container_of(work, struct lp8788_led, work); | |
94 | enum lp8788_isink_number num = led->isink_num; | |
95 | int enable; | |
96 | u8 val = led->brightness; | |
97 | ||
98 | mutex_lock(&led->lock); | |
99 | ||
100 | switch (num) { | |
101 | case LP8788_ISINK_1: | |
102 | case LP8788_ISINK_2: | |
103 | case LP8788_ISINK_3: | |
104 | lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val); | |
105 | break; | |
106 | default: | |
d45bb116 | 107 | mutex_unlock(&led->lock); |
eb80411b KM |
108 | return; |
109 | } | |
110 | ||
111 | enable = (val > 0) ? 1 : 0; | |
112 | if (enable != led->on) | |
113 | lp8788_led_enable(led, num, enable); | |
114 | ||
115 | mutex_unlock(&led->lock); | |
116 | } | |
117 | ||
118 | static void lp8788_brightness_set(struct led_classdev *led_cdev, | |
119 | enum led_brightness brt_val) | |
120 | { | |
121 | struct lp8788_led *led = | |
122 | container_of(led_cdev, struct lp8788_led, led_dev); | |
123 | ||
124 | led->brightness = brt_val; | |
125 | schedule_work(&led->work); | |
126 | } | |
127 | ||
98ea1ea2 | 128 | static int lp8788_led_probe(struct platform_device *pdev) |
eb80411b KM |
129 | { |
130 | struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); | |
131 | struct lp8788_led_platform_data *led_pdata; | |
132 | struct lp8788_led *led; | |
a1932edf | 133 | struct device *dev = &pdev->dev; |
eb80411b KM |
134 | int ret; |
135 | ||
a1932edf | 136 | led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL); |
eb80411b KM |
137 | if (!led) |
138 | return -ENOMEM; | |
139 | ||
140 | led->lp = lp; | |
141 | led->led_dev.max_brightness = MAX_BRIGHTNESS; | |
142 | led->led_dev.brightness_set = lp8788_brightness_set; | |
143 | ||
144 | led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL; | |
145 | ||
146 | if (!led_pdata || !led_pdata->name) | |
147 | led->led_dev.name = DEFAULT_LED_NAME; | |
148 | else | |
149 | led->led_dev.name = led_pdata->name; | |
150 | ||
151 | mutex_init(&led->lock); | |
152 | INIT_WORK(&led->work, lp8788_led_work); | |
153 | ||
154 | platform_set_drvdata(pdev, led); | |
155 | ||
156 | ret = lp8788_led_init_device(led, led_pdata); | |
157 | if (ret) { | |
a1932edf | 158 | dev_err(dev, "led init device err: %d\n", ret); |
eb80411b KM |
159 | return ret; |
160 | } | |
161 | ||
a1932edf | 162 | ret = led_classdev_register(dev, &led->led_dev); |
eb80411b | 163 | if (ret) { |
a1932edf | 164 | dev_err(dev, "led register err: %d\n", ret); |
eb80411b KM |
165 | return ret; |
166 | } | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
678e8a6b | 171 | static int lp8788_led_remove(struct platform_device *pdev) |
eb80411b KM |
172 | { |
173 | struct lp8788_led *led = platform_get_drvdata(pdev); | |
174 | ||
175 | led_classdev_unregister(&led->led_dev); | |
43829731 | 176 | flush_work(&led->work); |
eb80411b KM |
177 | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static struct platform_driver lp8788_led_driver = { | |
182 | .probe = lp8788_led_probe, | |
df07cf81 | 183 | .remove = lp8788_led_remove, |
eb80411b KM |
184 | .driver = { |
185 | .name = LP8788_DEV_KEYLED, | |
186 | .owner = THIS_MODULE, | |
187 | }, | |
188 | }; | |
189 | module_platform_driver(lp8788_led_driver); | |
190 | ||
191 | MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver"); | |
192 | MODULE_AUTHOR("Milo Kim"); | |
193 | MODULE_LICENSE("GPL"); | |
194 | MODULE_ALIAS("platform:lp8788-keyled"); |