Root/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
34struct 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
52static 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
73static 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
118static 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
128static int pm860x_led_dt_init(struct platform_device *pdev,
129                  struct pm860x_led *data)
130{
131    struct device_node *nproot, *np;
132    int iset = 0;
133
134    nproot = of_node_get(pdev->dev.parent->of_node);
135    if (!nproot)
136        return -ENODEV;
137    nproot = of_find_node_by_name(nproot, "leds");
138    if (!nproot) {
139        dev_err(&pdev->dev, "failed to find leds node\n");
140        return -ENODEV;
141    }
142    for_each_child_of_node(nproot, np) {
143        if (!of_node_cmp(np->name, data->name)) {
144            of_property_read_u32(np, "marvell,88pm860x-iset",
145                         &iset);
146            data->iset = PM8606_LED_CURRENT(iset);
147            break;
148        }
149    }
150    of_node_put(nproot);
151    return 0;
152}
153#else
154#define pm860x_led_dt_init(x, y) (-1)
155#endif
156
157static int pm860x_led_probe(struct platform_device *pdev)
158{
159    struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
160    struct pm860x_led_pdata *pdata = pdev->dev.platform_data;
161    struct pm860x_led *data;
162    struct resource *res;
163    int ret = 0;
164
165    data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
166    if (data == NULL)
167        return -ENOMEM;
168    res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
169    if (!res) {
170        dev_err(&pdev->dev, "No REG resource for control\n");
171        return -ENXIO;
172    }
173    data->reg_control = res->start;
174    res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
175    if (!res) {
176        dev_err(&pdev->dev, "No REG resource for blink\n");
177        return -ENXIO;
178    }
179    data->reg_blink = res->start;
180    memset(data->name, 0, MFD_NAME_SIZE);
181    switch (pdev->id) {
182    case 0:
183        data->blink_mask = LED1_BLINK_EN;
184        sprintf(data->name, "led0-red");
185        break;
186    case 1:
187        data->blink_mask = LED1_BLINK_EN;
188        sprintf(data->name, "led0-green");
189        break;
190    case 2:
191        data->blink_mask = LED1_BLINK_EN;
192        sprintf(data->name, "led0-blue");
193        break;
194    case 3:
195        data->blink_mask = LED2_BLINK_EN;
196        sprintf(data->name, "led1-red");
197        break;
198    case 4:
199        data->blink_mask = LED2_BLINK_EN;
200        sprintf(data->name, "led1-green");
201        break;
202    case 5:
203        data->blink_mask = LED2_BLINK_EN;
204        sprintf(data->name, "led1-blue");
205        break;
206    }
207    dev_set_drvdata(&pdev->dev, data);
208    data->chip = chip;
209    data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
210    data->port = pdev->id;
211    if (pm860x_led_dt_init(pdev, data))
212        if (pdata)
213            data->iset = pdata->iset;
214
215    data->current_brightness = 0;
216    data->cdev.name = data->name;
217    data->cdev.brightness_set = pm860x_led_set;
218    mutex_init(&data->lock);
219    INIT_WORK(&data->work, pm860x_led_work);
220
221    ret = led_classdev_register(chip->dev, &data->cdev);
222    if (ret < 0) {
223        dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
224        return ret;
225    }
226    pm860x_led_set(&data->cdev, 0);
227    return 0;
228}
229
230static int pm860x_led_remove(struct platform_device *pdev)
231{
232    struct pm860x_led *data = platform_get_drvdata(pdev);
233
234    led_classdev_unregister(&data->cdev);
235
236    return 0;
237}
238
239static struct platform_driver pm860x_led_driver = {
240    .driver = {
241        .name = "88pm860x-led",
242        .owner = THIS_MODULE,
243    },
244    .probe = pm860x_led_probe,
245    .remove = pm860x_led_remove,
246};
247
248module_platform_driver(pm860x_led_driver);
249
250MODULE_DESCRIPTION("LED driver for Marvell PM860x");
251MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
252MODULE_LICENSE("GPL");
253MODULE_ALIAS("platform:88pm860x-led");
254

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