1 /*
2 * LED Driver for Dialog DA9052 PMICs.
3 *
4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
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/workqueue.h>
20 #include <linux/slab.h>
21
22 #include <linux/mfd/da9052/reg.h>
23 #include <linux/mfd/da9052/da9052.h>
24 #include <linux/mfd/da9052/pdata.h>
25
26 #define DA9052_OPENDRAIN_OUTPUT 2
27 #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
28 #define DA9052_MASK_UPPER_NIBBLE 0xF0
29 #define DA9052_MASK_LOWER_NIBBLE 0x0F
30 #define DA9052_NIBBLE_SHIFT 4
31 #define DA9052_MAX_BRIGHTNESS 0x5f
32
33 struct da9052_led {
34 struct led_classdev cdev;
35 struct work_struct work;
36 struct da9052 *da9052;
37 unsigned char led_index;
38 unsigned char id;
39 int brightness;
40 };
41
42 static unsigned char led_reg[] = {
43 DA9052_LED_CONT_4_REG,
44 DA9052_LED_CONT_5_REG,
45 };
46
da9052_set_led_brightness(struct da9052_led * led)47 static int da9052_set_led_brightness(struct da9052_led *led)
48 {
49 u8 val;
50 int error;
51
52 val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM;
53
54 error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
55 if (error < 0)
56 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
57 error);
58 return error;
59 }
60
da9052_led_work(struct work_struct * work)61 static void da9052_led_work(struct work_struct *work)
62 {
63 struct da9052_led *led = container_of(work, struct da9052_led, work);
64
65 da9052_set_led_brightness(led);
66 }
67
da9052_led_set(struct led_classdev * led_cdev,enum led_brightness value)68 static void da9052_led_set(struct led_classdev *led_cdev,
69 enum led_brightness value)
70 {
71 struct da9052_led *led;
72
73 led = container_of(led_cdev, struct da9052_led, cdev);
74 led->brightness = value;
75 schedule_work(&led->work);
76 }
77
da9052_configure_leds(struct da9052 * da9052)78 static int da9052_configure_leds(struct da9052 *da9052)
79 {
80 int error;
81 unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
82 | DA9052_SET_HIGH_LVL_OUTPUT;
83
84 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
85 DA9052_MASK_LOWER_NIBBLE,
86 register_value);
87
88 if (error < 0) {
89 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
90 error);
91 return error;
92 }
93
94 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
95 DA9052_MASK_UPPER_NIBBLE,
96 register_value << DA9052_NIBBLE_SHIFT);
97 if (error < 0)
98 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
99 error);
100
101 return error;
102 }
103
da9052_led_probe(struct platform_device * pdev)104 static int da9052_led_probe(struct platform_device *pdev)
105 {
106 struct da9052_pdata *pdata;
107 struct da9052 *da9052;
108 struct led_platform_data *pled;
109 struct da9052_led *led = NULL;
110 int error = -ENODEV;
111 int i;
112
113 da9052 = dev_get_drvdata(pdev->dev.parent);
114 pdata = dev_get_platdata(da9052->dev);
115 if (pdata == NULL) {
116 dev_err(&pdev->dev, "No platform data\n");
117 goto err;
118 }
119
120 pled = pdata->pled;
121 if (pled == NULL) {
122 dev_err(&pdev->dev, "No platform data for LED\n");
123 goto err;
124 }
125
126 led = devm_kzalloc(&pdev->dev,
127 sizeof(struct da9052_led) * pled->num_leds,
128 GFP_KERNEL);
129 if (!led) {
130 error = -ENOMEM;
131 goto err;
132 }
133
134 for (i = 0; i < pled->num_leds; i++) {
135 led[i].cdev.name = pled->leds[i].name;
136 led[i].cdev.brightness_set = da9052_led_set;
137 led[i].cdev.brightness = LED_OFF;
138 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
139 led[i].brightness = LED_OFF;
140 led[i].led_index = pled->leds[i].flags;
141 led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
142 INIT_WORK(&led[i].work, da9052_led_work);
143
144 error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
145 if (error) {
146 dev_err(&pdev->dev, "Failed to register led %d\n",
147 led[i].led_index);
148 goto err_register;
149 }
150
151 error = da9052_set_led_brightness(&led[i]);
152 if (error) {
153 dev_err(&pdev->dev, "Unable to init led %d\n",
154 led[i].led_index);
155 continue;
156 }
157 }
158 error = da9052_configure_leds(led->da9052);
159 if (error) {
160 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
161 goto err_register;
162 }
163
164 platform_set_drvdata(pdev, led);
165
166 return 0;
167
168 err_register:
169 for (i = i - 1; i >= 0; i--) {
170 led_classdev_unregister(&led[i].cdev);
171 cancel_work_sync(&led[i].work);
172 }
173 err:
174 return error;
175 }
176
da9052_led_remove(struct platform_device * pdev)177 static int da9052_led_remove(struct platform_device *pdev)
178 {
179 struct da9052_led *led = platform_get_drvdata(pdev);
180 struct da9052_pdata *pdata;
181 struct da9052 *da9052;
182 struct led_platform_data *pled;
183 int i;
184
185 da9052 = dev_get_drvdata(pdev->dev.parent);
186 pdata = dev_get_platdata(da9052->dev);
187 pled = pdata->pled;
188
189 for (i = 0; i < pled->num_leds; i++) {
190 led[i].brightness = 0;
191 da9052_set_led_brightness(&led[i]);
192 led_classdev_unregister(&led[i].cdev);
193 cancel_work_sync(&led[i].work);
194 }
195
196 return 0;
197 }
198
199 static struct platform_driver da9052_led_driver = {
200 .driver = {
201 .name = "da9052-leds",
202 },
203 .probe = da9052_led_probe,
204 .remove = da9052_led_remove,
205 };
206
207 module_platform_driver(da9052_led_driver);
208
209 MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
210 MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
211 MODULE_LICENSE("GPL");
212