]>
Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
eb80411b KM |
2 | /* |
3 | * TI LP8788 MFD - keyled driver | |
4 | * | |
5 | * Copyright 2012 Texas Instruments | |
6 | * | |
7 | * Author: Milo(Woogyom) Kim <milo.kim@ti.com> | |
eb80411b KM |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/leds.h> | |
15 | #include <linux/mutex.h> | |
16 | #include <linux/mfd/lp8788.h> | |
17 | #include <linux/mfd/lp8788-isink.h> | |
18 | ||
19 | #define MAX_BRIGHTNESS LP8788_ISINK_MAX_PWM | |
20 | #define DEFAULT_LED_NAME "keyboard-backlight" | |
21 | ||
22 | struct lp8788_led { | |
23 | struct lp8788 *lp; | |
24 | struct mutex lock; | |
eb80411b KM |
25 | struct led_classdev led_dev; |
26 | enum lp8788_isink_number isink_num; | |
eb80411b KM |
27 | int on; |
28 | }; | |
29 | ||
30 | struct lp8788_led_config { | |
31 | enum lp8788_isink_scale scale; | |
32 | enum lp8788_isink_number num; | |
33 | int iout; | |
34 | }; | |
35 | ||
36 | static struct lp8788_led_config default_led_config = { | |
37 | .scale = LP8788_ISINK_SCALE_100mA, | |
38 | .num = LP8788_ISINK_3, | |
39 | .iout = 0, | |
40 | }; | |
41 | ||
42 | static int lp8788_led_init_device(struct lp8788_led *led, | |
43 | struct lp8788_led_platform_data *pdata) | |
44 | { | |
45 | struct lp8788_led_config *cfg = &default_led_config; | |
46 | u8 addr, mask, val; | |
47 | int ret; | |
48 | ||
49 | if (pdata) { | |
50 | cfg->scale = pdata->scale; | |
51 | cfg->num = pdata->num; | |
52 | cfg->iout = pdata->iout_code; | |
53 | } | |
54 | ||
55 | led->isink_num = cfg->num; | |
56 | ||
57 | /* scale configuration */ | |
58 | addr = LP8788_ISINK_CTRL; | |
59 | mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET); | |
4df7309a | 60 | val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET); |
eb80411b KM |
61 | ret = lp8788_update_bits(led->lp, addr, mask, val); |
62 | if (ret) | |
63 | return ret; | |
64 | ||
65 | /* current configuration */ | |
66 | addr = lp8788_iout_addr[cfg->num]; | |
67 | mask = lp8788_iout_mask[cfg->num]; | |
68 | val = cfg->iout; | |
69 | ||
70 | return lp8788_update_bits(led->lp, addr, mask, val); | |
71 | } | |
72 | ||
64998371 | 73 | static int lp8788_led_enable(struct lp8788_led *led, |
eb80411b KM |
74 | enum lp8788_isink_number num, int on) |
75 | { | |
64998371 AL |
76 | int ret; |
77 | ||
eb80411b KM |
78 | u8 mask = 1 << num; |
79 | u8 val = on << num; | |
80 | ||
64998371 AL |
81 | ret = lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val); |
82 | if (ret == 0) | |
83 | led->on = on; | |
eb80411b | 84 | |
64998371 | 85 | return ret; |
eb80411b KM |
86 | } |
87 | ||
64998371 AL |
88 | static int lp8788_brightness_set(struct led_classdev *led_cdev, |
89 | enum led_brightness val) | |
eb80411b | 90 | { |
64998371 AL |
91 | struct lp8788_led *led = |
92 | container_of(led_cdev, struct lp8788_led, led_dev); | |
93 | ||
eb80411b | 94 | enum lp8788_isink_number num = led->isink_num; |
64998371 | 95 | int enable, ret; |
eb80411b KM |
96 | |
97 | mutex_lock(&led->lock); | |
98 | ||
99 | switch (num) { | |
100 | case LP8788_ISINK_1: | |
101 | case LP8788_ISINK_2: | |
102 | case LP8788_ISINK_3: | |
64998371 AL |
103 | ret = lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val); |
104 | if (ret < 0) | |
105 | goto unlock; | |
eb80411b KM |
106 | break; |
107 | default: | |
d45bb116 | 108 | mutex_unlock(&led->lock); |
64998371 | 109 | return -EINVAL; |
eb80411b KM |
110 | } |
111 | ||
112 | enable = (val > 0) ? 1 : 0; | |
113 | if (enable != led->on) | |
64998371 AL |
114 | ret = lp8788_led_enable(led, num, enable); |
115 | unlock: | |
eb80411b | 116 | mutex_unlock(&led->lock); |
64998371 | 117 | return ret; |
eb80411b KM |
118 | } |
119 | ||
98ea1ea2 | 120 | static int lp8788_led_probe(struct platform_device *pdev) |
eb80411b KM |
121 | { |
122 | struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); | |
123 | struct lp8788_led_platform_data *led_pdata; | |
124 | struct lp8788_led *led; | |
a1932edf | 125 | struct device *dev = &pdev->dev; |
eb80411b KM |
126 | int ret; |
127 | ||
a1932edf | 128 | led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL); |
eb80411b KM |
129 | if (!led) |
130 | return -ENOMEM; | |
131 | ||
132 | led->lp = lp; | |
133 | led->led_dev.max_brightness = MAX_BRIGHTNESS; | |
64998371 | 134 | led->led_dev.brightness_set_blocking = lp8788_brightness_set; |
eb80411b KM |
135 | |
136 | led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL; | |
137 | ||
138 | if (!led_pdata || !led_pdata->name) | |
139 | led->led_dev.name = DEFAULT_LED_NAME; | |
140 | else | |
141 | led->led_dev.name = led_pdata->name; | |
142 | ||
143 | mutex_init(&led->lock); | |
eb80411b | 144 | |
eb80411b KM |
145 | ret = lp8788_led_init_device(led, led_pdata); |
146 | if (ret) { | |
a1932edf | 147 | dev_err(dev, "led init device err: %d\n", ret); |
eb80411b KM |
148 | return ret; |
149 | } | |
150 | ||
f165a66e | 151 | ret = devm_led_classdev_register(dev, &led->led_dev); |
eb80411b | 152 | if (ret) { |
a1932edf | 153 | dev_err(dev, "led register err: %d\n", ret); |
eb80411b KM |
154 | return ret; |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
eb80411b KM |
160 | static struct platform_driver lp8788_led_driver = { |
161 | .probe = lp8788_led_probe, | |
eb80411b KM |
162 | .driver = { |
163 | .name = LP8788_DEV_KEYLED, | |
eb80411b KM |
164 | }, |
165 | }; | |
166 | module_platform_driver(lp8788_led_driver); | |
167 | ||
168 | MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver"); | |
169 | MODULE_AUTHOR("Milo Kim"); | |
170 | MODULE_LICENSE("GPL"); | |
171 | MODULE_ALIAS("platform:lp8788-keyled"); |