1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/platform_device.h>
18#include <linux/leds.h>
19#include <linux/slab.h>
20
21#include <linux/mfd/da9052/reg.h>
22#include <linux/mfd/da9052/da9052.h>
23#include <linux/mfd/da9052/pdata.h>
24
25#define DA9052_OPENDRAIN_OUTPUT 2
26#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
27#define DA9052_MASK_UPPER_NIBBLE 0xF0
28#define DA9052_MASK_LOWER_NIBBLE 0x0F
29#define DA9052_NIBBLE_SHIFT 4
30#define DA9052_MAX_BRIGHTNESS 0x5f
31
32struct da9052_led {
33 struct led_classdev cdev;
34 struct da9052 *da9052;
35 unsigned char led_index;
36 unsigned char id;
37};
38
39static unsigned char led_reg[] = {
40 DA9052_LED_CONT_4_REG,
41 DA9052_LED_CONT_5_REG,
42};
43
44static int da9052_set_led_brightness(struct da9052_led *led,
45 enum led_brightness brightness)
46{
47 u8 val;
48 int error;
49
50 val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;
51
52 error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
53 if (error < 0)
54 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
55 error);
56 return error;
57}
58
59static int da9052_led_set(struct led_classdev *led_cdev,
60 enum led_brightness value)
61{
62 struct da9052_led *led =
63 container_of(led_cdev, struct da9052_led, cdev);
64
65 return da9052_set_led_brightness(led, value);
66}
67
68static int da9052_configure_leds(struct da9052 *da9052)
69{
70 int error;
71 unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
72 | DA9052_SET_HIGH_LVL_OUTPUT;
73
74 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
75 DA9052_MASK_LOWER_NIBBLE,
76 register_value);
77
78 if (error < 0) {
79 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
80 error);
81 return error;
82 }
83
84 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
85 DA9052_MASK_UPPER_NIBBLE,
86 register_value << DA9052_NIBBLE_SHIFT);
87 if (error < 0)
88 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
89 error);
90
91 return error;
92}
93
94static int da9052_led_probe(struct platform_device *pdev)
95{
96 struct da9052_pdata *pdata;
97 struct da9052 *da9052;
98 struct led_platform_data *pled;
99 struct da9052_led *led = NULL;
100 int error = -ENODEV;
101 int i;
102
103 da9052 = dev_get_drvdata(pdev->dev.parent);
104 pdata = dev_get_platdata(da9052->dev);
105 if (pdata == NULL) {
106 dev_err(&pdev->dev, "No platform data\n");
107 goto err;
108 }
109
110 pled = pdata->pled;
111 if (pled == NULL) {
112 dev_err(&pdev->dev, "No platform data for LED\n");
113 goto err;
114 }
115
116 led = devm_kcalloc(&pdev->dev,
117 pled->num_leds, sizeof(struct da9052_led),
118 GFP_KERNEL);
119 if (!led) {
120 error = -ENOMEM;
121 goto err;
122 }
123
124 for (i = 0; i < pled->num_leds; i++) {
125 led[i].cdev.name = pled->leds[i].name;
126 led[i].cdev.brightness_set_blocking = da9052_led_set;
127 led[i].cdev.brightness = LED_OFF;
128 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
129 led[i].led_index = pled->leds[i].flags;
130 led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
131
132 error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
133 if (error) {
134 dev_err(&pdev->dev, "Failed to register led %d\n",
135 led[i].led_index);
136 goto err_register;
137 }
138
139 error = da9052_set_led_brightness(&led[i],
140 led[i].cdev.brightness);
141 if (error) {
142 dev_err(&pdev->dev, "Unable to init led %d\n",
143 led[i].led_index);
144 continue;
145 }
146 }
147 error = da9052_configure_leds(led->da9052);
148 if (error) {
149 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
150 goto err_register;
151 }
152
153 platform_set_drvdata(pdev, led);
154
155 return 0;
156
157err_register:
158 for (i = i - 1; i >= 0; i--)
159 led_classdev_unregister(&led[i].cdev);
160err:
161 return error;
162}
163
164static int da9052_led_remove(struct platform_device *pdev)
165{
166 struct da9052_led *led = platform_get_drvdata(pdev);
167 struct da9052_pdata *pdata;
168 struct da9052 *da9052;
169 struct led_platform_data *pled;
170 int i;
171
172 da9052 = dev_get_drvdata(pdev->dev.parent);
173 pdata = dev_get_platdata(da9052->dev);
174 pled = pdata->pled;
175
176 for (i = 0; i < pled->num_leds; i++) {
177 da9052_set_led_brightness(&led[i], LED_OFF);
178 led_classdev_unregister(&led[i].cdev);
179 }
180
181 return 0;
182}
183
184static struct platform_driver da9052_led_driver = {
185 .driver = {
186 .name = "da9052-leds",
187 },
188 .probe = da9052_led_probe,
189 .remove = da9052_led_remove,
190};
191
192module_platform_driver(da9052_led_driver);
193
194MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
195MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
196MODULE_LICENSE("GPL");
197
