1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * TI LP8788 MFD - keyled driver |
4 | * |
5 | * Copyright 2012 Texas Instruments |
6 | * |
7 | * Author: Milo(Woogyom) Kim <milo.kim@ti.com> |
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; |
25 | struct led_classdev led_dev; |
26 | enum lp8788_isink_number isink_num; |
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); |
60 | val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET); |
61 | ret = lp8788_update_bits(lp: led->lp, reg: addr, mask, data: 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(lp: led->lp, reg: addr, mask, data: val); |
71 | } |
72 | |
73 | static int lp8788_led_enable(struct lp8788_led *led, |
74 | enum lp8788_isink_number num, int on) |
75 | { |
76 | int ret; |
77 | |
78 | u8 mask = 1 << num; |
79 | u8 val = on << num; |
80 | |
81 | ret = lp8788_update_bits(lp: led->lp, LP8788_ISINK_CTRL, mask, data: val); |
82 | if (ret == 0) |
83 | led->on = on; |
84 | |
85 | return ret; |
86 | } |
87 | |
88 | static int lp8788_brightness_set(struct led_classdev *led_cdev, |
89 | enum led_brightness val) |
90 | { |
91 | struct lp8788_led *led = |
92 | container_of(led_cdev, struct lp8788_led, led_dev); |
93 | |
94 | enum lp8788_isink_number num = led->isink_num; |
95 | int enable, ret; |
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: |
103 | ret = lp8788_write_byte(lp: led->lp, reg: lp8788_pwm_addr[num], data: val); |
104 | if (ret < 0) |
105 | goto unlock; |
106 | break; |
107 | default: |
108 | mutex_unlock(lock: &led->lock); |
109 | return -EINVAL; |
110 | } |
111 | |
112 | enable = (val > 0) ? 1 : 0; |
113 | if (enable != led->on) |
114 | ret = lp8788_led_enable(led, num, on: enable); |
115 | unlock: |
116 | mutex_unlock(lock: &led->lock); |
117 | return ret; |
118 | } |
119 | |
120 | static int lp8788_led_probe(struct platform_device *pdev) |
121 | { |
122 | struct lp8788 *lp = dev_get_drvdata(dev: pdev->dev.parent); |
123 | struct lp8788_led_platform_data *led_pdata; |
124 | struct lp8788_led *led; |
125 | struct device *dev = &pdev->dev; |
126 | int ret; |
127 | |
128 | led = devm_kzalloc(dev, size: sizeof(struct lp8788_led), GFP_KERNEL); |
129 | if (!led) |
130 | return -ENOMEM; |
131 | |
132 | led->lp = lp; |
133 | led->led_dev.max_brightness = MAX_BRIGHTNESS; |
134 | led->led_dev.brightness_set_blocking = lp8788_brightness_set; |
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); |
144 | |
145 | ret = lp8788_led_init_device(led, pdata: led_pdata); |
146 | if (ret) { |
147 | dev_err(dev, "led init device err: %d\n" , ret); |
148 | return ret; |
149 | } |
150 | |
151 | ret = devm_led_classdev_register(parent: dev, led_cdev: &led->led_dev); |
152 | if (ret) { |
153 | dev_err(dev, "led register err: %d\n" , ret); |
154 | return ret; |
155 | } |
156 | |
157 | return 0; |
158 | } |
159 | |
160 | static struct platform_driver lp8788_led_driver = { |
161 | .probe = lp8788_led_probe, |
162 | .driver = { |
163 | .name = LP8788_DEV_KEYLED, |
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" ); |
172 | |