leds: leds-lp5523: fix build warnings
[~shefty/rdma-dev.git] / drivers / leds / leds-88pm860x.c
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>
14 #include <linux/init.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/i2c.h>
18 #include <linux/leds.h>
19 #include <linux/slab.h>
20 #include <linux/workqueue.h>
21 #include <linux/mfd/88pm860x.h>
22 #include <linux/module.h>
23
24 #define LED_PWM_MASK            (0x1F)
25 #define LED_CURRENT_MASK        (0x07 << 5)
26
27 #define LED_BLINK_MASK          (0x7F)
28
29 #define LED_ON_CONTINUOUS       (0x0F << 3)
30
31 #define LED1_BLINK_EN           (1 << 1)
32 #define LED2_BLINK_EN           (1 << 2)
33
34 struct pm860x_led {
35         struct led_classdev cdev;
36         struct i2c_client *i2c;
37         struct work_struct work;
38         struct pm860x_chip *chip;
39         struct mutex lock;
40         char name[MFD_NAME_SIZE];
41
42         int port;
43         int iset;
44         unsigned char brightness;
45         unsigned char current_brightness;
46
47         int reg_control;
48         int reg_blink;
49         int blink_mask;
50 };
51
52 static int led_power_set(struct pm860x_chip *chip, int port, int on)
53 {
54         int ret = -EINVAL;
55
56         switch (port) {
57         case 0:
58         case 1:
59         case 2:
60                 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
61                         pm8606_osc_disable(chip, RGB1_ENABLE);
62                 break;
63         case 3:
64         case 4:
65         case 5:
66                 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
67                         pm8606_osc_disable(chip, RGB2_ENABLE);
68                 break;
69         }
70         return ret;
71 }
72
73 static void pm860x_led_work(struct work_struct *work)
74 {
75
76         struct pm860x_led *led;
77         struct pm860x_chip *chip;
78         unsigned char buf[3];
79         int ret;
80
81         led = container_of(work, struct pm860x_led, work);
82         chip = led->chip;
83         mutex_lock(&led->lock);
84         if ((led->current_brightness == 0) && led->brightness) {
85                 led_power_set(chip, led->port, 1);
86                 if (led->iset) {
87                         pm860x_set_bits(led->i2c, led->reg_control,
88                                         LED_CURRENT_MASK, led->iset);
89                 }
90                 pm860x_set_bits(led->i2c, led->reg_blink,
91                                 LED_BLINK_MASK, LED_ON_CONTINUOUS);
92                 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
93                                 led->blink_mask);
94         }
95         pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
96                         led->brightness);
97
98         if (led->brightness == 0) {
99                 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
100                 ret = buf[0] & LED_PWM_MASK;
101                 ret |= buf[1] & LED_PWM_MASK;
102                 ret |= buf[2] & LED_PWM_MASK;
103                 if (ret == 0) {
104                         /* unset current since no led is lighting */
105                         pm860x_set_bits(led->i2c, led->reg_control,
106                                         LED_CURRENT_MASK, 0);
107                         pm860x_set_bits(led->i2c, PM8606_WLED3B,
108                                         led->blink_mask, 0);
109                         led_power_set(chip, led->port, 0);
110                 }
111         }
112         led->current_brightness = led->brightness;
113         dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
114                 led->reg_control, led->brightness);
115         mutex_unlock(&led->lock);
116 }
117
118 static void pm860x_led_set(struct led_classdev *cdev,
119                            enum led_brightness value)
120 {
121         struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
122
123         data->brightness = value >> 3;
124         schedule_work(&data->work);
125 }
126
127 #ifdef CONFIG_OF
128 static int pm860x_led_dt_init(struct platform_device *pdev,
129                               struct pm860x_led *data)
130 {
131         struct device_node *nproot = pdev->dev.parent->of_node, *np;
132         int iset = 0;
133         if (!nproot)
134                 return -ENODEV;
135         nproot = of_find_node_by_name(nproot, "leds");
136         if (!nproot) {
137                 dev_err(&pdev->dev, "failed to find leds node\n");
138                 return -ENODEV;
139         }
140         for_each_child_of_node(nproot, np) {
141                 if (!of_node_cmp(np->name, data->name)) {
142                         of_property_read_u32(np, "marvell,88pm860x-iset",
143                                              &iset);
144                         data->iset = PM8606_LED_CURRENT(iset);
145                         break;
146                 }
147         }
148         return 0;
149 }
150 #else
151 #define pm860x_led_dt_init(x, y)        (-1)
152 #endif
153
154 static int pm860x_led_probe(struct platform_device *pdev)
155 {
156         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
157         struct pm860x_led_pdata *pdata = pdev->dev.platform_data;
158         struct pm860x_led *data;
159         struct resource *res;
160         int ret = 0;
161
162         data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
163         if (data == NULL)
164                 return -ENOMEM;
165         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
166         if (!res) {
167                 dev_err(&pdev->dev, "No REG resource for control\n");
168                 ret = -ENXIO;
169                 goto out;
170         }
171         data->reg_control = res->start;
172         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
173         if (!res) {
174                 dev_err(&pdev->dev, "No REG resource for blink\n");
175                 ret = -ENXIO;
176                 goto out;
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         }
206         dev_set_drvdata(&pdev->dev, data);
207         data->chip = chip;
208         data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
209         data->port = pdev->id;
210         if (pm860x_led_dt_init(pdev, data))
211                 if (pdata)
212                         data->iset = pdata->iset;
213
214         data->current_brightness = 0;
215         data->cdev.name = data->name;
216         data->cdev.brightness_set = pm860x_led_set;
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);
223                 return ret;
224         }
225         pm860x_led_set(&data->cdev, 0);
226         return 0;
227 out:
228         devm_kfree(&pdev->dev, data);
229         return ret;
230 }
231
232 static int pm860x_led_remove(struct platform_device *pdev)
233 {
234         struct pm860x_led *data = platform_get_drvdata(pdev);
235
236         led_classdev_unregister(&data->cdev);
237
238         return 0;
239 }
240
241 static struct platform_driver pm860x_led_driver = {
242         .driver = {
243                 .name   = "88pm860x-led",
244                 .owner  = THIS_MODULE,
245         },
246         .probe  = pm860x_led_probe,
247         .remove = pm860x_led_remove,
248 };
249
250 module_platform_driver(pm860x_led_driver);
251
252 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
253 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
254 MODULE_LICENSE("GPL");
255 MODULE_ALIAS("platform:88pm860x-led");