Commit | Line | Data |
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0a2f915b HZ |
1 | /* |
2 | * LED driver for Marvell 88PM860x | |
3 | * | |
4 | * Copyright (C) 2009 Marvell International Ltd. | |
5 | * Haojian Zhuang <haojian.zhuang@marvell.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
2e57d567 | 14 | #include <linux/of.h> |
0a2f915b HZ |
15 | #include <linux/platform_device.h> |
16 | #include <linux/i2c.h> | |
17 | #include <linux/leds.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
0a2f915b HZ |
19 | #include <linux/workqueue.h> |
20 | #include <linux/mfd/88pm860x.h> | |
54f4dedb | 21 | #include <linux/module.h> |
0a2f915b | 22 | |
0a2f915b HZ |
23 | #define LED_PWM_MASK (0x1F) |
24 | #define LED_CURRENT_MASK (0x07 << 5) | |
25 | ||
0a2f915b HZ |
26 | #define LED_BLINK_MASK (0x7F) |
27 | ||
f5d59fc5 | 28 | #define LED_ON_CONTINUOUS (0x0F << 3) |
0a2f915b HZ |
29 | |
30 | #define LED1_BLINK_EN (1 << 1) | |
31 | #define LED2_BLINK_EN (1 << 2) | |
32 | ||
0a2f915b HZ |
33 | struct pm860x_led { |
34 | struct led_classdev cdev; | |
35 | struct i2c_client *i2c; | |
36 | struct work_struct work; | |
37 | struct pm860x_chip *chip; | |
38 | struct mutex lock; | |
39 | char name[MFD_NAME_SIZE]; | |
40 | ||
41 | int port; | |
42 | int iset; | |
0a2f915b HZ |
43 | unsigned char brightness; |
44 | unsigned char current_brightness; | |
45 | ||
894fc8f2 HZ |
46 | int reg_control; |
47 | int reg_blink; | |
48 | int blink_mask; | |
0a2f915b HZ |
49 | }; |
50 | ||
b3b97473 JZ |
51 | static int led_power_set(struct pm860x_chip *chip, int port, int on) |
52 | { | |
53 | int ret = -EINVAL; | |
54 | ||
55 | switch (port) { | |
894fc8f2 HZ |
56 | case 0: |
57 | case 1: | |
58 | case 2: | |
b3b97473 JZ |
59 | ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) : |
60 | pm8606_osc_disable(chip, RGB1_ENABLE); | |
61 | break; | |
894fc8f2 HZ |
62 | case 3: |
63 | case 4: | |
64 | case 5: | |
b3b97473 JZ |
65 | ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) : |
66 | pm8606_osc_disable(chip, RGB2_ENABLE); | |
67 | break; | |
68 | } | |
69 | return ret; | |
70 | } | |
71 | ||
f5d59fc5 | 72 | static void pm860x_led_work(struct work_struct *work) |
0a2f915b | 73 | { |
0a2f915b | 74 | |
f5d59fc5 HZ |
75 | struct pm860x_led *led; |
76 | struct pm860x_chip *chip; | |
3154c344 | 77 | unsigned char buf[3]; |
894fc8f2 | 78 | int ret; |
f5d59fc5 HZ |
79 | |
80 | led = container_of(work, struct pm860x_led, work); | |
81 | chip = led->chip; | |
0a2f915b | 82 | mutex_lock(&led->lock); |
f5d59fc5 | 83 | if ((led->current_brightness == 0) && led->brightness) { |
b3b97473 | 84 | led_power_set(chip, led->port, 1); |
f5d59fc5 | 85 | if (led->iset) { |
894fc8f2 | 86 | pm860x_set_bits(led->i2c, led->reg_control, |
f5d59fc5 | 87 | LED_CURRENT_MASK, led->iset); |
0a2f915b | 88 | } |
894fc8f2 | 89 | pm860x_set_bits(led->i2c, led->reg_blink, |
3154c344 | 90 | LED_BLINK_MASK, LED_ON_CONTINUOUS); |
894fc8f2 HZ |
91 | pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask, |
92 | led->blink_mask); | |
0a2f915b | 93 | } |
894fc8f2 | 94 | pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK, |
f5d59fc5 | 95 | led->brightness); |
3154c344 HZ |
96 | |
97 | if (led->brightness == 0) { | |
894fc8f2 | 98 | pm860x_bulk_read(led->i2c, led->reg_control, 3, buf); |
3154c344 HZ |
99 | ret = buf[0] & LED_PWM_MASK; |
100 | ret |= buf[1] & LED_PWM_MASK; | |
101 | ret |= buf[2] & LED_PWM_MASK; | |
102 | if (ret == 0) { | |
103 | /* unset current since no led is lighting */ | |
894fc8f2 | 104 | pm860x_set_bits(led->i2c, led->reg_control, |
3154c344 | 105 | LED_CURRENT_MASK, 0); |
894fc8f2 HZ |
106 | pm860x_set_bits(led->i2c, PM8606_WLED3B, |
107 | led->blink_mask, 0); | |
b3b97473 | 108 | led_power_set(chip, led->port, 0); |
3154c344 HZ |
109 | } |
110 | } | |
f5d59fc5 HZ |
111 | led->current_brightness = led->brightness; |
112 | dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", | |
894fc8f2 | 113 | led->reg_control, led->brightness); |
0a2f915b | 114 | mutex_unlock(&led->lock); |
0a2f915b HZ |
115 | } |
116 | ||
117 | static void pm860x_led_set(struct led_classdev *cdev, | |
118 | enum led_brightness value) | |
119 | { | |
120 | struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); | |
121 | ||
0a2f915b | 122 | data->brightness = value >> 3; |
0a2f915b | 123 | schedule_work(&data->work); |
0a2f915b HZ |
124 | } |
125 | ||
2e57d567 HZ |
126 | #ifdef CONFIG_OF |
127 | static int pm860x_led_dt_init(struct platform_device *pdev, | |
128 | struct pm860x_led *data) | |
129 | { | |
61d4eb27 | 130 | struct device_node *nproot, *np; |
2e57d567 | 131 | int iset = 0; |
61d4eb27 AL |
132 | |
133 | nproot = of_node_get(pdev->dev.parent->of_node); | |
2e57d567 HZ |
134 | if (!nproot) |
135 | return -ENODEV; | |
77dfa771 | 136 | nproot = of_get_child_by_name(nproot, "leds"); |
2e57d567 HZ |
137 | if (!nproot) { |
138 | dev_err(&pdev->dev, "failed to find leds node\n"); | |
139 | return -ENODEV; | |
140 | } | |
141 | for_each_child_of_node(nproot, np) { | |
142 | if (!of_node_cmp(np->name, data->name)) { | |
143 | of_property_read_u32(np, "marvell,88pm860x-iset", | |
144 | &iset); | |
145 | data->iset = PM8606_LED_CURRENT(iset); | |
146 | break; | |
147 | } | |
148 | } | |
61d4eb27 | 149 | of_node_put(nproot); |
2e57d567 HZ |
150 | return 0; |
151 | } | |
152 | #else | |
153 | #define pm860x_led_dt_init(x, y) (-1) | |
154 | #endif | |
155 | ||
0a2f915b HZ |
156 | static int pm860x_led_probe(struct platform_device *pdev) |
157 | { | |
158 | struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
87aae1ea | 159 | struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev); |
0a2f915b HZ |
160 | struct pm860x_led *data; |
161 | struct resource *res; | |
894fc8f2 | 162 | int ret = 0; |
0a2f915b | 163 | |
b523cfe6 | 164 | data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL); |
0a2f915b HZ |
165 | if (data == NULL) |
166 | return -ENOMEM; | |
894fc8f2 HZ |
167 | res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control"); |
168 | if (!res) { | |
169 | dev_err(&pdev->dev, "No REG resource for control\n"); | |
3651c4b9 | 170 | return -ENXIO; |
894fc8f2 HZ |
171 | } |
172 | data->reg_control = res->start; | |
173 | res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink"); | |
174 | if (!res) { | |
175 | dev_err(&pdev->dev, "No REG resource for blink\n"); | |
3651c4b9 | 176 | return -ENXIO; |
894fc8f2 HZ |
177 | } |
178 | data->reg_blink = res->start; | |
179 | memset(data->name, 0, MFD_NAME_SIZE); | |
180 | switch (pdev->id) { | |
181 | case 0: | |
182 | data->blink_mask = LED1_BLINK_EN; | |
183 | sprintf(data->name, "led0-red"); | |
184 | break; | |
185 | case 1: | |
186 | data->blink_mask = LED1_BLINK_EN; | |
187 | sprintf(data->name, "led0-green"); | |
188 | break; | |
189 | case 2: | |
190 | data->blink_mask = LED1_BLINK_EN; | |
191 | sprintf(data->name, "led0-blue"); | |
192 | break; | |
193 | case 3: | |
194 | data->blink_mask = LED2_BLINK_EN; | |
195 | sprintf(data->name, "led1-red"); | |
196 | break; | |
197 | case 4: | |
198 | data->blink_mask = LED2_BLINK_EN; | |
199 | sprintf(data->name, "led1-green"); | |
200 | break; | |
201 | case 5: | |
202 | data->blink_mask = LED2_BLINK_EN; | |
203 | sprintf(data->name, "led1-blue"); | |
204 | break; | |
205 | } | |
84196a2f | 206 | platform_set_drvdata(pdev, data); |
0a2f915b HZ |
207 | data->chip = chip; |
208 | data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; | |
894fc8f2 | 209 | data->port = pdev->id; |
2e57d567 HZ |
210 | if (pm860x_led_dt_init(pdev, data)) |
211 | if (pdata) | |
212 | data->iset = pdata->iset; | |
0a2f915b HZ |
213 | |
214 | data->current_brightness = 0; | |
215 | data->cdev.name = data->name; | |
216 | data->cdev.brightness_set = pm860x_led_set; | |
0a2f915b HZ |
217 | mutex_init(&data->lock); |
218 | INIT_WORK(&data->work, pm860x_led_work); | |
219 | ||
220 | ret = led_classdev_register(chip->dev, &data->cdev); | |
221 | if (ret < 0) { | |
222 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); | |
b523cfe6 | 223 | return ret; |
0a2f915b | 224 | } |
3154c344 | 225 | pm860x_led_set(&data->cdev, 0); |
0a2f915b | 226 | return 0; |
0a2f915b HZ |
227 | } |
228 | ||
229 | static int pm860x_led_remove(struct platform_device *pdev) | |
230 | { | |
231 | struct pm860x_led *data = platform_get_drvdata(pdev); | |
232 | ||
233 | led_classdev_unregister(&data->cdev); | |
0a2f915b HZ |
234 | |
235 | return 0; | |
236 | } | |
237 | ||
238 | static struct platform_driver pm860x_led_driver = { | |
239 | .driver = { | |
240 | .name = "88pm860x-led", | |
241 | .owner = THIS_MODULE, | |
242 | }, | |
243 | .probe = pm860x_led_probe, | |
244 | .remove = pm860x_led_remove, | |
245 | }; | |
246 | ||
892a8843 | 247 | module_platform_driver(pm860x_led_driver); |
0a2f915b HZ |
248 | |
249 | MODULE_DESCRIPTION("LED driver for Marvell PM860x"); | |
250 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
251 | MODULE_LICENSE("GPL"); | |
252 | MODULE_ALIAS("platform:88pm860x-led"); |