blob: c2def5551ce1bdd8c81caabbbee5dc0dbb39975d [file] [log] [blame]
Haojian Zhuang0a2f9152010-01-06 17:10:09 -05001/*
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>
Haojian Zhuang2e57d562012-09-21 18:06:52 +080014#include <linux/of.h>
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050015#include <linux/platform_device.h>
16#include <linux/i2c.h>
17#include <linux/leds.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050019#include <linux/workqueue.h>
20#include <linux/mfd/88pm860x.h>
Paul Gortmaker54f4ded2011-07-03 13:56:03 -040021#include <linux/module.h>
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050022
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050023#define LED_PWM_MASK (0x1F)
24#define LED_CURRENT_MASK (0x07 << 5)
25
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050026#define LED_BLINK_MASK (0x7F)
27
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040028#define LED_ON_CONTINUOUS (0x0F << 3)
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050029
30#define LED1_BLINK_EN (1 << 1)
31#define LED2_BLINK_EN (1 << 2)
32
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050033struct 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;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050043 unsigned char brightness;
44 unsigned char current_brightness;
45
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080046 int reg_control;
47 int reg_blink;
48 int blink_mask;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050049};
50
Jett.Zhoub3b97472012-02-28 10:59:29 +080051static int led_power_set(struct pm860x_chip *chip, int port, int on)
52{
53 int ret = -EINVAL;
54
55 switch (port) {
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080056 case 0:
57 case 1:
58 case 2:
Jett.Zhoub3b97472012-02-28 10:59:29 +080059 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
60 pm8606_osc_disable(chip, RGB1_ENABLE);
61 break;
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080062 case 3:
63 case 4:
64 case 5:
Jett.Zhoub3b97472012-02-28 10:59:29 +080065 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
66 pm8606_osc_disable(chip, RGB2_ENABLE);
67 break;
68 }
69 return ret;
70}
71
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050072static void pm860x_led_work(struct work_struct *work)
73{
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040074
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050075 struct pm860x_led *led;
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040076 struct pm860x_chip *chip;
Haojian Zhuang3154c342011-03-07 23:43:10 +080077 unsigned char buf[3];
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080078 int ret;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050079
80 led = container_of(work, struct pm860x_led, work);
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040081 chip = led->chip;
82 mutex_lock(&led->lock);
83 if ((led->current_brightness == 0) && led->brightness) {
Jett.Zhoub3b97472012-02-28 10:59:29 +080084 led_power_set(chip, led->port, 1);
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040085 if (led->iset) {
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080086 pm860x_set_bits(led->i2c, led->reg_control,
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040087 LED_CURRENT_MASK, led->iset);
88 }
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080089 pm860x_set_bits(led->i2c, led->reg_blink,
Haojian Zhuang3154c342011-03-07 23:43:10 +080090 LED_BLINK_MASK, LED_ON_CONTINUOUS);
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080091 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
92 led->blink_mask);
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040093 }
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080094 pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040095 led->brightness);
Haojian Zhuang3154c342011-03-07 23:43:10 +080096
97 if (led->brightness == 0) {
Haojian Zhuang894fc8f2012-08-08 23:17:27 +080098 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
Haojian Zhuang3154c342011-03-07 23:43:10 +080099 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 */
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800104 pm860x_set_bits(led->i2c, led->reg_control,
Haojian Zhuang3154c342011-03-07 23:43:10 +0800105 LED_CURRENT_MASK, 0);
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800106 pm860x_set_bits(led->i2c, PM8606_WLED3B,
107 led->blink_mask, 0);
Jett.Zhoub3b97472012-02-28 10:59:29 +0800108 led_power_set(chip, led->port, 0);
Haojian Zhuang3154c342011-03-07 23:43:10 +0800109 }
110 }
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400111 led->current_brightness = led->brightness;
112 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800113 led->reg_control, led->brightness);
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400114 mutex_unlock(&led->lock);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500115}
116
117static 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
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500122 data->brightness = value >> 3;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500123 schedule_work(&data->work);
124}
125
Haojian Zhuang2e57d562012-09-21 18:06:52 +0800126#ifdef CONFIG_OF
127static int pm860x_led_dt_init(struct platform_device *pdev,
128 struct pm860x_led *data)
129{
Axel Lin61d4eb22013-01-27 04:56:57 -0800130 struct device_node *nproot, *np;
Haojian Zhuang2e57d562012-09-21 18:06:52 +0800131 int iset = 0;
Axel Lin61d4eb22013-01-27 04:56:57 -0800132
Krzysztof Kozlowski1175d5b2014-04-04 00:51:20 -0700133 if (!pdev->dev.parent->of_node)
Haojian Zhuang2e57d562012-09-21 18:06:52 +0800134 return -ENODEV;
Krzysztof Kozlowski1175d5b2014-04-04 00:51:20 -0700135 nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
Haojian Zhuang2e57d562012-09-21 18:06:52 +0800136 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 }
Axel Lin61d4eb22013-01-27 04:56:57 -0800148 of_node_put(nproot);
Haojian Zhuang2e57d562012-09-21 18:06:52 +0800149 return 0;
150}
151#else
152#define pm860x_led_dt_init(x, y) (-1)
153#endif
154
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500155static int pm860x_led_probe(struct platform_device *pdev)
156{
157 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
Jingoo Han87aae1e2013-07-30 01:07:35 -0700158 struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500159 struct pm860x_led *data;
160 struct resource *res;
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800161 int ret = 0;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500162
Devendra Nagab523cfe2012-07-02 18:15:43 +0800163 data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500164 if (data == NULL)
165 return -ENOMEM;
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800166 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
167 if (!res) {
168 dev_err(&pdev->dev, "No REG resource for control\n");
Jingoo Han3651c4b2012-10-28 21:31:07 -0700169 return -ENXIO;
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800170 }
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");
Jingoo Han3651c4b2012-10-28 21:31:07 -0700175 return -ENXIO;
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800176 }
177 data->reg_blink = res->start;
178 memset(data->name, 0, MFD_NAME_SIZE);
179 switch (pdev->id) {
180 case 0:
181 data->blink_mask = LED1_BLINK_EN;
182 sprintf(data->name, "led0-red");
183 break;
184 case 1:
185 data->blink_mask = LED1_BLINK_EN;
186 sprintf(data->name, "led0-green");
187 break;
188 case 2:
189 data->blink_mask = LED1_BLINK_EN;
190 sprintf(data->name, "led0-blue");
191 break;
192 case 3:
193 data->blink_mask = LED2_BLINK_EN;
194 sprintf(data->name, "led1-red");
195 break;
196 case 4:
197 data->blink_mask = LED2_BLINK_EN;
198 sprintf(data->name, "led1-green");
199 break;
200 case 5:
201 data->blink_mask = LED2_BLINK_EN;
202 sprintf(data->name, "led1-blue");
203 break;
204 }
Jingoo Han84196a22013-05-23 03:28:33 -0700205 platform_set_drvdata(pdev, data);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500206 data->chip = chip;
207 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
Haojian Zhuang894fc8f2012-08-08 23:17:27 +0800208 data->port = pdev->id;
Haojian Zhuang2e57d562012-09-21 18:06:52 +0800209 if (pm860x_led_dt_init(pdev, data))
210 if (pdata)
211 data->iset = pdata->iset;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500212
213 data->current_brightness = 0;
214 data->cdev.name = data->name;
215 data->cdev.brightness_set = pm860x_led_set;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500216 mutex_init(&data->lock);
217 INIT_WORK(&data->work, pm860x_led_work);
218
219 ret = led_classdev_register(chip->dev, &data->cdev);
220 if (ret < 0) {
221 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
Devendra Nagab523cfe2012-07-02 18:15:43 +0800222 return ret;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500223 }
Haojian Zhuang3154c342011-03-07 23:43:10 +0800224 pm860x_led_set(&data->cdev, 0);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500225 return 0;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500226}
227
228static int pm860x_led_remove(struct platform_device *pdev)
229{
230 struct pm860x_led *data = platform_get_drvdata(pdev);
231
232 led_classdev_unregister(&data->cdev);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500233
234 return 0;
235}
236
237static struct platform_driver pm860x_led_driver = {
238 .driver = {
239 .name = "88pm860x-led",
240 .owner = THIS_MODULE,
241 },
242 .probe = pm860x_led_probe,
243 .remove = pm860x_led_remove,
244};
245
Axel Lin892a8842012-01-10 15:09:24 -0800246module_platform_driver(pm860x_led_driver);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500247
248MODULE_DESCRIPTION("LED driver for Marvell PM860x");
249MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
250MODULE_LICENSE("GPL");
251MODULE_ALIAS("platform:88pm860x-led");