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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * LED driver for WM8350 driven LEDS. | |
4 | * | |
5 | * Copyright(C) 2007, 2008 Wolfson Microelectronics PLC. | |
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6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
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9 | #include <linux/platform_device.h> |
10 | #include <linux/leds.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/mfd/wm8350/pmic.h> | |
13 | #include <linux/regulator/consumer.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
54f4dedb | 15 | #include <linux/module.h> |
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16 | |
17 | /* Microamps */ | |
18 | static const int isink_cur[] = { | |
19 | 4, | |
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82 | 223191 | |
83 | }; | |
84 | ||
85 | #define to_wm8350_led(led_cdev) \ | |
86 | container_of(led_cdev, struct wm8350_led, cdev) | |
87 | ||
0dd756f7 | 88 | static int wm8350_led_enable(struct wm8350_led *led) |
0081e802 | 89 | { |
0dd756f7 | 90 | int ret = 0; |
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91 | |
92 | if (led->enabled) | |
0dd756f7 | 93 | return ret; |
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94 | |
95 | ret = regulator_enable(led->isink); | |
96 | if (ret != 0) { | |
97 | dev_err(led->cdev.dev, "Failed to enable ISINK: %d\n", ret); | |
0dd756f7 | 98 | return ret; |
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99 | } |
100 | ||
101 | ret = regulator_enable(led->dcdc); | |
102 | if (ret != 0) { | |
103 | dev_err(led->cdev.dev, "Failed to enable DCDC: %d\n", ret); | |
104 | regulator_disable(led->isink); | |
0dd756f7 | 105 | return ret; |
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106 | } |
107 | ||
108 | led->enabled = 1; | |
0dd756f7 AL |
109 | |
110 | return ret; | |
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111 | } |
112 | ||
0dd756f7 | 113 | static int wm8350_led_disable(struct wm8350_led *led) |
0081e802 | 114 | { |
0dd756f7 | 115 | int ret = 0; |
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116 | |
117 | if (!led->enabled) | |
0dd756f7 | 118 | return ret; |
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119 | |
120 | ret = regulator_disable(led->dcdc); | |
121 | if (ret != 0) { | |
122 | dev_err(led->cdev.dev, "Failed to disable DCDC: %d\n", ret); | |
0dd756f7 | 123 | return ret; |
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124 | } |
125 | ||
126 | ret = regulator_disable(led->isink); | |
127 | if (ret != 0) { | |
128 | dev_err(led->cdev.dev, "Failed to disable ISINK: %d\n", ret); | |
d67eb8e6 MB |
129 | ret = regulator_enable(led->dcdc); |
130 | if (ret != 0) | |
131 | dev_err(led->cdev.dev, "Failed to reenable DCDC: %d\n", | |
132 | ret); | |
0dd756f7 | 133 | return ret; |
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134 | } |
135 | ||
136 | led->enabled = 0; | |
0dd756f7 AL |
137 | |
138 | return ret; | |
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139 | } |
140 | ||
0dd756f7 AL |
141 | static int wm8350_led_set(struct led_classdev *led_cdev, |
142 | enum led_brightness value) | |
0081e802 | 143 | { |
0dd756f7 AL |
144 | struct wm8350_led *led = to_wm8350_led(led_cdev); |
145 | unsigned long flags; | |
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146 | int ret; |
147 | int uA; | |
0081e802 | 148 | |
0dd756f7 | 149 | led->value = value; |
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150 | |
151 | spin_lock_irqsave(&led->value_lock, flags); | |
152 | ||
153 | if (led->value == LED_OFF) { | |
154 | spin_unlock_irqrestore(&led->value_lock, flags); | |
0dd756f7 | 155 | return wm8350_led_disable(led); |
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156 | } |
157 | ||
158 | /* This scales linearly into the index of valid current | |
159 | * settings which results in a linear scaling of perceived | |
160 | * brightness due to the non-linear current settings provided | |
161 | * by the hardware. | |
162 | */ | |
163 | uA = (led->max_uA_index * led->value) / LED_FULL; | |
164 | spin_unlock_irqrestore(&led->value_lock, flags); | |
165 | BUG_ON(uA >= ARRAY_SIZE(isink_cur)); | |
166 | ||
167 | ret = regulator_set_current_limit(led->isink, isink_cur[uA], | |
168 | isink_cur[uA]); | |
0dd756f7 | 169 | if (ret != 0) { |
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170 | dev_err(led->cdev.dev, "Failed to set %duA: %d\n", |
171 | isink_cur[uA], ret); | |
0dd756f7 AL |
172 | return ret; |
173 | } | |
0081e802 | 174 | |
0dd756f7 | 175 | return wm8350_led_enable(led); |
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176 | } |
177 | ||
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178 | static void wm8350_led_shutdown(struct platform_device *pdev) |
179 | { | |
180 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
181 | ||
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182 | led->value = LED_OFF; |
183 | wm8350_led_disable(led); | |
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184 | } |
185 | ||
186 | static int wm8350_led_probe(struct platform_device *pdev) | |
187 | { | |
188 | struct regulator *isink, *dcdc; | |
189 | struct wm8350_led *led; | |
87aae1ea | 190 | struct wm8350_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
490dcee9 | 191 | int i; |
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192 | |
193 | if (pdata == NULL) { | |
194 | dev_err(&pdev->dev, "no platform data\n"); | |
195 | return -ENODEV; | |
196 | } | |
197 | ||
198 | if (pdata->max_uA < isink_cur[0]) { | |
199 | dev_err(&pdev->dev, "Invalid maximum current %duA\n", | |
200 | pdata->max_uA); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
490dcee9 | 204 | isink = devm_regulator_get(&pdev->dev, "led_isink"); |
0081e802 | 205 | if (IS_ERR(isink)) { |
b75d2802 | 206 | dev_err(&pdev->dev, "%s: can't get ISINK\n", __func__); |
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207 | return PTR_ERR(isink); |
208 | } | |
209 | ||
490dcee9 | 210 | dcdc = devm_regulator_get(&pdev->dev, "led_vcc"); |
0081e802 | 211 | if (IS_ERR(dcdc)) { |
b75d2802 | 212 | dev_err(&pdev->dev, "%s: can't get DCDC\n", __func__); |
490dcee9 | 213 | return PTR_ERR(dcdc); |
0081e802 MB |
214 | } |
215 | ||
c957b614 | 216 | led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); |
490dcee9 AL |
217 | if (led == NULL) |
218 | return -ENOMEM; | |
0081e802 | 219 | |
0dd756f7 | 220 | led->cdev.brightness_set_blocking = wm8350_led_set; |
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221 | led->cdev.default_trigger = pdata->default_trigger; |
222 | led->cdev.name = pdata->name; | |
859cb7f2 | 223 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
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224 | led->enabled = regulator_is_enabled(isink); |
225 | led->isink = isink; | |
226 | led->dcdc = dcdc; | |
227 | ||
228 | for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++) | |
229 | if (isink_cur[i] >= pdata->max_uA) | |
230 | break; | |
231 | led->max_uA_index = i; | |
232 | if (pdata->max_uA != isink_cur[i]) | |
233 | dev_warn(&pdev->dev, | |
234 | "Maximum current %duA is not directly supported," | |
235 | " check platform data\n", | |
236 | pdata->max_uA); | |
237 | ||
238 | spin_lock_init(&led->value_lock); | |
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239 | led->value = LED_OFF; |
240 | platform_set_drvdata(pdev, led); | |
241 | ||
490dcee9 | 242 | return led_classdev_register(&pdev->dev, &led->cdev); |
0081e802 MB |
243 | } |
244 | ||
245 | static int wm8350_led_remove(struct platform_device *pdev) | |
246 | { | |
247 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
248 | ||
249 | led_classdev_unregister(&led->cdev); | |
0081e802 | 250 | wm8350_led_disable(led); |
0081e802 MB |
251 | return 0; |
252 | } | |
253 | ||
254 | static struct platform_driver wm8350_led_driver = { | |
255 | .driver = { | |
256 | .name = "wm8350-led", | |
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257 | }, |
258 | .probe = wm8350_led_probe, | |
259 | .remove = wm8350_led_remove, | |
260 | .shutdown = wm8350_led_shutdown, | |
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261 | }; |
262 | ||
892a8843 | 263 | module_platform_driver(wm8350_led_driver); |
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264 | |
265 | MODULE_AUTHOR("Mark Brown"); | |
266 | MODULE_DESCRIPTION("WM8350 LED driver"); | |
267 | MODULE_LICENSE("GPL"); | |
268 | MODULE_ALIAS("platform:wm8350-led"); |