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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
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
