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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
3 */
4#include <linux/leds.h>
5#include <linux/module.h>
6#include <linux/of.h>
7#include <linux/platform_device.h>
8#include <linux/pm.h>
9#include <linux/regmap.h>
10
11#define PM8058_LED_TYPE_COMMON 0x00
12#define PM8058_LED_TYPE_KEYPAD 0x01
13#define PM8058_LED_TYPE_FLASH 0x02
14
15#define PM8058_LED_TYPE_COMMON_MASK 0xf8
16#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
17#define PM8058_LED_TYPE_COMMON_SHIFT 3
18#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
19
20struct pm8058_led {
21 struct regmap *map;
22 u32 reg;
23 u32 ledtype;
24 struct led_classdev cdev;
25};
26
27static void pm8058_led_set(struct led_classdev *cled,
28 enum led_brightness value)
29{
30 struct pm8058_led *led;
31 int ret = 0;
32 unsigned int mask = 0;
33 unsigned int val = 0;
34
35 led = container_of(cled, struct pm8058_led, cdev);
36 switch (led->ledtype) {
37 case PM8058_LED_TYPE_COMMON:
38 mask = PM8058_LED_TYPE_COMMON_MASK;
39 val = value << PM8058_LED_TYPE_COMMON_SHIFT;
40 break;
41 case PM8058_LED_TYPE_KEYPAD:
42 case PM8058_LED_TYPE_FLASH:
43 mask = PM8058_LED_TYPE_KEYPAD_MASK;
44 val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
45 break;
46 default:
47 break;
48 }
49
50 ret = regmap_update_bits(led->map, led->reg, mask, val);
51 if (ret)
52 pr_err("Failed to set LED brightness\n");
53}
54
55static enum led_brightness pm8058_led_get(struct led_classdev *cled)
56{
57 struct pm8058_led *led;
58 int ret;
59 unsigned int val;
60
61 led = container_of(cled, struct pm8058_led, cdev);
62
63 ret = regmap_read(led->map, led->reg, &val);
64 if (ret) {
65 pr_err("Failed to get LED brightness\n");
66 return LED_OFF;
67 }
68
69 switch (led->ledtype) {
70 case PM8058_LED_TYPE_COMMON:
71 val &= PM8058_LED_TYPE_COMMON_MASK;
72 val >>= PM8058_LED_TYPE_COMMON_SHIFT;
73 break;
74 case PM8058_LED_TYPE_KEYPAD:
75 case PM8058_LED_TYPE_FLASH:
76 val &= PM8058_LED_TYPE_KEYPAD_MASK;
77 val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
78 break;
79 default:
80 val = LED_OFF;
81 break;
82 }
83
84 return val;
85}
86
87static int pm8058_led_probe(struct platform_device *pdev)
88{
89 struct led_init_data init_data = {};
90 struct device *dev = &pdev->dev;
91 struct pm8058_led *led;
92 struct device_node *np;
93 int ret;
94 struct regmap *map;
95 enum led_brightness maxbright;
96 enum led_default_state state;
97
98 led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
99 if (!led)
100 return -ENOMEM;
101
102 led->ledtype = (u32)(unsigned long)of_device_get_match_data(dev);
103
104 map = dev_get_regmap(dev->parent, NULL);
105 if (!map) {
106 dev_err(dev, "Parent regmap unavailable.\n");
107 return -ENXIO;
108 }
109 led->map = map;
110
111 np = dev_of_node(dev);
112
113 ret = of_property_read_u32(np, "reg", &led->reg);
114 if (ret) {
115 dev_err(dev, "no register offset specified\n");
116 return -EINVAL;
117 }
118
119 led->cdev.brightness_set = pm8058_led_set;
120 led->cdev.brightness_get = pm8058_led_get;
121 if (led->ledtype == PM8058_LED_TYPE_COMMON)
122 maxbright = 31; /* 5 bits */
123 else
124 maxbright = 15; /* 4 bits */
125 led->cdev.max_brightness = maxbright;
126
127 init_data.fwnode = of_fwnode_handle(np);
128
129 state = led_init_default_state_get(init_data.fwnode);
130 switch (state) {
131 case LEDS_DEFSTATE_ON:
132 led->cdev.brightness = maxbright;
133 pm8058_led_set(&led->cdev, maxbright);
134 break;
135 case LEDS_DEFSTATE_KEEP:
136 led->cdev.brightness = pm8058_led_get(&led->cdev);
137 break;
138 default:
139 led->cdev.brightness = LED_OFF;
140 pm8058_led_set(&led->cdev, LED_OFF);
141 }
142
143 if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
144 led->ledtype == PM8058_LED_TYPE_FLASH)
145 led->cdev.flags = LED_CORE_SUSPENDRESUME;
146
147 ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
148 if (ret)
149 dev_err(dev, "Failed to register LED for %pOF\n", np);
150
151 return ret;
152}
153
154static const struct of_device_id pm8058_leds_id_table[] = {
155 {
156 .compatible = "qcom,pm8058-led",
157 .data = (void *)PM8058_LED_TYPE_COMMON
158 },
159 {
160 .compatible = "qcom,pm8058-keypad-led",
161 .data = (void *)PM8058_LED_TYPE_KEYPAD
162 },
163 {
164 .compatible = "qcom,pm8058-flash-led",
165 .data = (void *)PM8058_LED_TYPE_FLASH
166 },
167 { },
168};
169MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
170
171static struct platform_driver pm8058_led_driver = {
172 .probe = pm8058_led_probe,
173 .driver = {
174 .name = "pm8058-leds",
175 .of_match_table = pm8058_leds_id_table,
176 },
177};
178module_platform_driver(pm8058_led_driver);
179
180MODULE_DESCRIPTION("PM8058 LEDs driver");
181MODULE_LICENSE("GPL v2");
182MODULE_ALIAS("platform:pm8058-leds");
1/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 */
12#include <linux/leds.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16#include <linux/platform_device.h>
17#include <linux/pm.h>
18#include <linux/regmap.h>
19
20#define PM8058_LED_TYPE_COMMON 0x00
21#define PM8058_LED_TYPE_KEYPAD 0x01
22#define PM8058_LED_TYPE_FLASH 0x02
23
24#define PM8058_LED_TYPE_COMMON_MASK 0xf8
25#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
26#define PM8058_LED_TYPE_COMMON_SHIFT 3
27#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
28
29struct pm8058_led {
30 struct regmap *map;
31 u32 reg;
32 u32 ledtype;
33 struct led_classdev cdev;
34};
35
36static void pm8058_led_set(struct led_classdev *cled,
37 enum led_brightness value)
38{
39 struct pm8058_led *led;
40 int ret = 0;
41 unsigned int mask = 0;
42 unsigned int val = 0;
43
44 led = container_of(cled, struct pm8058_led, cdev);
45 switch (led->ledtype) {
46 case PM8058_LED_TYPE_COMMON:
47 mask = PM8058_LED_TYPE_COMMON_MASK;
48 val = value << PM8058_LED_TYPE_COMMON_SHIFT;
49 break;
50 case PM8058_LED_TYPE_KEYPAD:
51 case PM8058_LED_TYPE_FLASH:
52 mask = PM8058_LED_TYPE_KEYPAD_MASK;
53 val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
54 break;
55 default:
56 break;
57 }
58
59 ret = regmap_update_bits(led->map, led->reg, mask, val);
60 if (ret)
61 pr_err("Failed to set LED brightness\n");
62}
63
64static enum led_brightness pm8058_led_get(struct led_classdev *cled)
65{
66 struct pm8058_led *led;
67 int ret;
68 unsigned int val;
69
70 led = container_of(cled, struct pm8058_led, cdev);
71
72 ret = regmap_read(led->map, led->reg, &val);
73 if (ret) {
74 pr_err("Failed to get LED brightness\n");
75 return LED_OFF;
76 }
77
78 switch (led->ledtype) {
79 case PM8058_LED_TYPE_COMMON:
80 val &= PM8058_LED_TYPE_COMMON_MASK;
81 val >>= PM8058_LED_TYPE_COMMON_SHIFT;
82 break;
83 case PM8058_LED_TYPE_KEYPAD:
84 case PM8058_LED_TYPE_FLASH:
85 val &= PM8058_LED_TYPE_KEYPAD_MASK;
86 val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
87 break;
88 default:
89 val = LED_OFF;
90 break;
91 }
92
93 return val;
94}
95
96static int pm8058_led_probe(struct platform_device *pdev)
97{
98 struct pm8058_led *led;
99 struct device_node *np = pdev->dev.of_node;
100 int ret;
101 struct regmap *map;
102 const char *state;
103 enum led_brightness maxbright;
104
105 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
106 if (!led)
107 return -ENOMEM;
108
109 led->ledtype = (u32)(unsigned long)of_device_get_match_data(&pdev->dev);
110
111 map = dev_get_regmap(pdev->dev.parent, NULL);
112 if (!map) {
113 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
114 return -ENXIO;
115 }
116 led->map = map;
117
118 ret = of_property_read_u32(np, "reg", &led->reg);
119 if (ret) {
120 dev_err(&pdev->dev, "no register offset specified\n");
121 return -EINVAL;
122 }
123
124 /* Use label else node name */
125 led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
126 led->cdev.default_trigger =
127 of_get_property(np, "linux,default-trigger", NULL);
128 led->cdev.brightness_set = pm8058_led_set;
129 led->cdev.brightness_get = pm8058_led_get;
130 if (led->ledtype == PM8058_LED_TYPE_COMMON)
131 maxbright = 31; /* 5 bits */
132 else
133 maxbright = 15; /* 4 bits */
134 led->cdev.max_brightness = maxbright;
135
136 state = of_get_property(np, "default-state", NULL);
137 if (state) {
138 if (!strcmp(state, "keep")) {
139 led->cdev.brightness = pm8058_led_get(&led->cdev);
140 } else if (!strcmp(state, "on")) {
141 led->cdev.brightness = maxbright;
142 pm8058_led_set(&led->cdev, maxbright);
143 } else {
144 led->cdev.brightness = LED_OFF;
145 pm8058_led_set(&led->cdev, LED_OFF);
146 }
147 }
148
149 if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
150 led->ledtype == PM8058_LED_TYPE_FLASH)
151 led->cdev.flags = LED_CORE_SUSPENDRESUME;
152
153 ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
154 if (ret) {
155 dev_err(&pdev->dev, "unable to register led \"%s\"\n",
156 led->cdev.name);
157 return ret;
158 }
159
160 return 0;
161}
162
163static const struct of_device_id pm8058_leds_id_table[] = {
164 {
165 .compatible = "qcom,pm8058-led",
166 .data = (void *)PM8058_LED_TYPE_COMMON
167 },
168 {
169 .compatible = "qcom,pm8058-keypad-led",
170 .data = (void *)PM8058_LED_TYPE_KEYPAD
171 },
172 {
173 .compatible = "qcom,pm8058-flash-led",
174 .data = (void *)PM8058_LED_TYPE_FLASH
175 },
176 { },
177};
178MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
179
180static struct platform_driver pm8058_led_driver = {
181 .probe = pm8058_led_probe,
182 .driver = {
183 .name = "pm8058-leds",
184 .of_match_table = pm8058_leds_id_table,
185 },
186};
187module_platform_driver(pm8058_led_driver);
188
189MODULE_DESCRIPTION("PM8058 LEDs driver");
190MODULE_LICENSE("GPL v2");
191MODULE_ALIAS("platform:pm8058-leds");