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13#include <linux/kernel.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/i2c.h>
17#include <linux/leds.h>
18#include <linux/slab.h>
19#include <linux/workqueue.h>
20#include <linux/mfd/88pm860x.h>
21#include <linux/module.h>
22
23#define LED_PWM_MASK (0x1F)
24#define LED_CURRENT_MASK (0x07 << 5)
25
26#define LED_BLINK_MASK (0x7F)
27
28#define LED_ON_CONTINUOUS (0x0F << 3)
29
30#define LED1_BLINK_EN (1 << 1)
31#define LED2_BLINK_EN (1 << 2)
32
33struct 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;
43 unsigned char brightness;
44 unsigned char current_brightness;
45
46 int reg_control;
47 int reg_blink;
48 int blink_mask;
49};
50
51static int led_power_set(struct pm860x_chip *chip, int port, int on)
52{
53 int ret = -EINVAL;
54
55 switch (port) {
56 case 0:
57 case 1:
58 case 2:
59 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
60 pm8606_osc_disable(chip, RGB1_ENABLE);
61 break;
62 case 3:
63 case 4:
64 case 5:
65 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
66 pm8606_osc_disable(chip, RGB2_ENABLE);
67 break;
68 }
69 return ret;
70}
71
72static void pm860x_led_work(struct work_struct *work)
73{
74
75 struct pm860x_led *led;
76 struct pm860x_chip *chip;
77 unsigned char buf[3];
78 int ret;
79
80 led = container_of(work, struct pm860x_led, work);
81 chip = led->chip;
82 mutex_lock(&led->lock);
83 if ((led->current_brightness == 0) && led->brightness) {
84 led_power_set(chip, led->port, 1);
85 if (led->iset) {
86 pm860x_set_bits(led->i2c, led->reg_control,
87 LED_CURRENT_MASK, led->iset);
88 }
89 pm860x_set_bits(led->i2c, led->reg_blink,
90 LED_BLINK_MASK, LED_ON_CONTINUOUS);
91 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
92 led->blink_mask);
93 }
94 pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
95 led->brightness);
96
97 if (led->brightness == 0) {
98 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
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
104 pm860x_set_bits(led->i2c, led->reg_control,
105 LED_CURRENT_MASK, 0);
106 pm860x_set_bits(led->i2c, PM8606_WLED3B,
107 led->blink_mask, 0);
108 led_power_set(chip, led->port, 0);
109 }
110 }
111 led->current_brightness = led->brightness;
112 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
113 led->reg_control, led->brightness);
114 mutex_unlock(&led->lock);
115}
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
122 data->brightness = value >> 3;
123 schedule_work(&data->work);
124}
125
126#ifdef CONFIG_OF
127static int pm860x_led_dt_init(struct platform_device *pdev,
128 struct pm860x_led *data)
129{
130 struct device_node *nproot, *np;
131 int iset = 0;
132
133 if (!pdev->dev.parent->of_node)
134 return -ENODEV;
135 nproot = of_get_child_by_name(pdev->dev.parent->of_node, "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 of_node_put(nproot);
149 return 0;
150}
151#else
152#define pm860x_led_dt_init(x, y) (-1)
153#endif
154
155static int pm860x_led_probe(struct platform_device *pdev)
156{
157 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
158 struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
159 struct pm860x_led *data;
160 struct resource *res;
161 int ret = 0;
162
163 data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
164 if (data == NULL)
165 return -ENOMEM;
166 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
167 if (!res) {
168 dev_err(&pdev->dev, "No REG resource for control\n");
169 return -ENXIO;
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 return -ENXIO;
176 }
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 }
205 platform_set_drvdata(pdev, data);
206 data->chip = chip;
207 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
208 data->port = pdev->id;
209 if (pm860x_led_dt_init(pdev, data))
210 if (pdata)
211 data->iset = pdata->iset;
212
213 data->current_brightness = 0;
214 data->cdev.name = data->name;
215 data->cdev.brightness_set = pm860x_led_set;
216 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);
222 return ret;
223 }
224 pm860x_led_set(&data->cdev, 0);
225 return 0;
226}
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);
233
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
246module_platform_driver(pm860x_led_driver);
247
248MODULE_DESCRIPTION("LED driver for Marvell PM860x");
249MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
250MODULE_LICENSE("GPL");
251MODULE_ALIAS("platform:88pm860x-led");
252
