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9#include <linux/kernel.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/i2c.h>
13#include <linux/leds.h>
14#include <linux/slab.h>
15#include <linux/mfd/88pm860x.h>
16#include <linux/module.h>
17
18#define LED_PWM_MASK (0x1F)
19#define LED_CURRENT_MASK (0x07 << 5)
20
21#define LED_BLINK_MASK (0x7F)
22
23#define LED_ON_CONTINUOUS (0x0F << 3)
24
25#define LED1_BLINK_EN (1 << 1)
26#define LED2_BLINK_EN (1 << 2)
27
28struct pm860x_led {
29 struct led_classdev cdev;
30 struct i2c_client *i2c;
31 struct pm860x_chip *chip;
32 struct mutex lock;
33 char name[MFD_NAME_SIZE];
34
35 int port;
36 int iset;
37 unsigned char brightness;
38 unsigned char current_brightness;
39
40 int reg_control;
41 int reg_blink;
42 int blink_mask;
43};
44
45static int led_power_set(struct pm860x_chip *chip, int port, int on)
46{
47 int ret = -EINVAL;
48
49 switch (port) {
50 case 0:
51 case 1:
52 case 2:
53 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
54 pm8606_osc_disable(chip, RGB1_ENABLE);
55 break;
56 case 3:
57 case 4:
58 case 5:
59 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
60 pm8606_osc_disable(chip, RGB2_ENABLE);
61 break;
62 }
63 return ret;
64}
65
66static int pm860x_led_set(struct led_classdev *cdev,
67 enum led_brightness value)
68{
69 struct pm860x_led *led = container_of(cdev, struct pm860x_led, cdev);
70 struct pm860x_chip *chip;
71 unsigned char buf[3];
72 int ret;
73
74 chip = led->chip;
75 mutex_lock(&led->lock);
76 led->brightness = value >> 3;
77
78 if ((led->current_brightness == 0) && led->brightness) {
79 led_power_set(chip, led->port, 1);
80 if (led->iset) {
81 pm860x_set_bits(led->i2c, led->reg_control,
82 LED_CURRENT_MASK, led->iset);
83 }
84 pm860x_set_bits(led->i2c, led->reg_blink,
85 LED_BLINK_MASK, LED_ON_CONTINUOUS);
86 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
87 led->blink_mask);
88 }
89 pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
90 led->brightness);
91
92 if (led->brightness == 0) {
93 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
94 ret = buf[0] & LED_PWM_MASK;
95 ret |= buf[1] & LED_PWM_MASK;
96 ret |= buf[2] & LED_PWM_MASK;
97 if (ret == 0) {
98
99 pm860x_set_bits(led->i2c, led->reg_control,
100 LED_CURRENT_MASK, 0);
101 pm860x_set_bits(led->i2c, PM8606_WLED3B,
102 led->blink_mask, 0);
103 led_power_set(chip, led->port, 0);
104 }
105 }
106 led->current_brightness = led->brightness;
107 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
108 led->reg_control, led->brightness);
109 mutex_unlock(&led->lock);
110
111 return 0;
112}
113
114#ifdef CONFIG_OF
115static int pm860x_led_dt_init(struct platform_device *pdev,
116 struct pm860x_led *data)
117{
118 struct device_node *nproot, *np;
119 int iset = 0;
120
121 if (!dev_of_node(pdev->dev.parent))
122 return -ENODEV;
123 nproot = of_get_child_by_name(dev_of_node(pdev->dev.parent), "leds");
124 if (!nproot) {
125 dev_err(&pdev->dev, "failed to find leds node\n");
126 return -ENODEV;
127 }
128 for_each_available_child_of_node(nproot, np) {
129 if (of_node_name_eq(np, data->name)) {
130 of_property_read_u32(np, "marvell,88pm860x-iset",
131 &iset);
132 data->iset = PM8606_LED_CURRENT(iset);
133 of_node_put(np);
134 break;
135 }
136 }
137 of_node_put(nproot);
138 return 0;
139}
140#else
141#define pm860x_led_dt_init(x, y) (-1)
142#endif
143
144static int pm860x_led_probe(struct platform_device *pdev)
145{
146 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
147 struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
148 struct pm860x_led *data;
149 struct resource *res;
150 int ret = 0;
151
152 data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
153 if (data == NULL)
154 return -ENOMEM;
155 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
156 if (!res) {
157 dev_err(&pdev->dev, "No REG resource for control\n");
158 return -ENXIO;
159 }
160 data->reg_control = res->start;
161 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
162 if (!res) {
163 dev_err(&pdev->dev, "No REG resource for blink\n");
164 return -ENXIO;
165 }
166 data->reg_blink = res->start;
167 memset(data->name, 0, MFD_NAME_SIZE);
168 switch (pdev->id) {
169 case 0:
170 data->blink_mask = LED1_BLINK_EN;
171 sprintf(data->name, "led0-red");
172 break;
173 case 1:
174 data->blink_mask = LED1_BLINK_EN;
175 sprintf(data->name, "led0-green");
176 break;
177 case 2:
178 data->blink_mask = LED1_BLINK_EN;
179 sprintf(data->name, "led0-blue");
180 break;
181 case 3:
182 data->blink_mask = LED2_BLINK_EN;
183 sprintf(data->name, "led1-red");
184 break;
185 case 4:
186 data->blink_mask = LED2_BLINK_EN;
187 sprintf(data->name, "led1-green");
188 break;
189 case 5:
190 data->blink_mask = LED2_BLINK_EN;
191 sprintf(data->name, "led1-blue");
192 break;
193 }
194 data->chip = chip;
195 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
196 data->port = pdev->id;
197 if (pm860x_led_dt_init(pdev, data))
198 if (pdata)
199 data->iset = pdata->iset;
200
201 data->current_brightness = 0;
202 data->cdev.name = data->name;
203 data->cdev.brightness_set_blocking = pm860x_led_set;
204 mutex_init(&data->lock);
205
206 ret = led_classdev_register(chip->dev, &data->cdev);
207 if (ret < 0) {
208 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
209 return ret;
210 }
211 pm860x_led_set(&data->cdev, 0);
212
213 platform_set_drvdata(pdev, data);
214
215 return 0;
216}
217
218static int pm860x_led_remove(struct platform_device *pdev)
219{
220 struct pm860x_led *data = platform_get_drvdata(pdev);
221
222 led_classdev_unregister(&data->cdev);
223
224 return 0;
225}
226
227static struct platform_driver pm860x_led_driver = {
228 .driver = {
229 .name = "88pm860x-led",
230 },
231 .probe = pm860x_led_probe,
232 .remove = pm860x_led_remove,
233};
234
235module_platform_driver(pm860x_led_driver);
236
237MODULE_DESCRIPTION("LED driver for Marvell PM860x");
238MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
239MODULE_LICENSE("GPL");
240MODULE_ALIAS("platform:88pm860x-led");
241
