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