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75cb2e1d PM |
1 | /* |
2 | * Copyright 2011 bct electronic GmbH | |
3 | * | |
4 | * Author: Peter Meerwald <p.meerwald@bct-electronic.com> | |
5 | * | |
6 | * Based on leds-pca955x.c | |
7 | * | |
8 | * This file is subject to the terms and conditions of version 2 of | |
9 | * the GNU General Public License. See the file COPYING in the main | |
10 | * directory of this archive for more details. | |
11 | * | |
12 | * LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62) | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/ctype.h> | |
20 | #include <linux/leds.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/i2c.h> | |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/slab.h> | |
2f73c392 | 25 | #include <linux/platform_data/leds-pca9633.h> |
75cb2e1d PM |
26 | |
27 | /* LED select registers determine the source that drives LED outputs */ | |
28 | #define PCA9633_LED_OFF 0x0 /* LED driver off */ | |
29 | #define PCA9633_LED_ON 0x1 /* LED driver on */ | |
30 | #define PCA9633_LED_PWM 0x2 /* Controlled through PWM */ | |
31 | #define PCA9633_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */ | |
32 | ||
33 | #define PCA9633_MODE1 0x00 | |
34 | #define PCA9633_MODE2 0x01 | |
35 | #define PCA9633_PWM_BASE 0x02 | |
36 | #define PCA9633_LEDOUT 0x08 | |
37 | ||
38 | static const struct i2c_device_id pca9633_id[] = { | |
39 | { "pca9633", 0 }, | |
40 | { } | |
41 | }; | |
42 | MODULE_DEVICE_TABLE(i2c, pca9633_id); | |
43 | ||
44 | struct pca9633_led { | |
45 | struct i2c_client *client; | |
46 | struct work_struct work; | |
47 | enum led_brightness brightness; | |
48 | struct led_classdev led_cdev; | |
49 | int led_num; /* 0 .. 3 potentially */ | |
50 | char name[32]; | |
51 | }; | |
52 | ||
53 | static void pca9633_led_work(struct work_struct *work) | |
54 | { | |
55 | struct pca9633_led *pca9633 = container_of(work, | |
56 | struct pca9633_led, work); | |
57 | u8 ledout = i2c_smbus_read_byte_data(pca9633->client, PCA9633_LEDOUT); | |
58 | int shift = 2 * pca9633->led_num; | |
59 | u8 mask = 0x3 << shift; | |
60 | ||
61 | switch (pca9633->brightness) { | |
62 | case LED_FULL: | |
63 | i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, | |
64 | (ledout & ~mask) | (PCA9633_LED_ON << shift)); | |
65 | break; | |
66 | case LED_OFF: | |
67 | i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, | |
68 | ledout & ~mask); | |
69 | break; | |
70 | default: | |
71 | i2c_smbus_write_byte_data(pca9633->client, | |
72 | PCA9633_PWM_BASE + pca9633->led_num, | |
73 | pca9633->brightness); | |
74 | i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, | |
75 | (ledout & ~mask) | (PCA9633_LED_PWM << shift)); | |
76 | break; | |
77 | } | |
78 | } | |
79 | ||
80 | static void pca9633_led_set(struct led_classdev *led_cdev, | |
81 | enum led_brightness value) | |
82 | { | |
83 | struct pca9633_led *pca9633; | |
84 | ||
85 | pca9633 = container_of(led_cdev, struct pca9633_led, led_cdev); | |
86 | ||
87 | pca9633->brightness = value; | |
88 | ||
89 | /* | |
90 | * Must use workqueue for the actual I/O since I2C operations | |
91 | * can sleep. | |
92 | */ | |
93 | schedule_work(&pca9633->work); | |
94 | } | |
95 | ||
98ea1ea2 | 96 | static int pca9633_probe(struct i2c_client *client, |
75cb2e1d PM |
97 | const struct i2c_device_id *id) |
98 | { | |
99 | struct pca9633_led *pca9633; | |
2f73c392 | 100 | struct pca9633_platform_data *pdata; |
75cb2e1d PM |
101 | int i, err; |
102 | ||
75cb2e1d PM |
103 | pdata = client->dev.platform_data; |
104 | ||
105 | if (pdata) { | |
2f73c392 | 106 | if (pdata->leds.num_leds <= 0 || pdata->leds.num_leds > 4) { |
75cb2e1d PM |
107 | dev_err(&client->dev, "board info must claim at most 4 LEDs"); |
108 | return -EINVAL; | |
109 | } | |
110 | } | |
111 | ||
983ce884 | 112 | pca9633 = devm_kzalloc(&client->dev, 4 * sizeof(*pca9633), GFP_KERNEL); |
75cb2e1d PM |
113 | if (!pca9633) |
114 | return -ENOMEM; | |
115 | ||
116 | i2c_set_clientdata(client, pca9633); | |
117 | ||
118 | for (i = 0; i < 4; i++) { | |
119 | pca9633[i].client = client; | |
120 | pca9633[i].led_num = i; | |
121 | ||
122 | /* Platform data can specify LED names and default triggers */ | |
2f73c392 PM |
123 | if (pdata && i < pdata->leds.num_leds) { |
124 | if (pdata->leds.leds[i].name) | |
75cb2e1d PM |
125 | snprintf(pca9633[i].name, |
126 | sizeof(pca9633[i].name), "pca9633:%s", | |
2f73c392 PM |
127 | pdata->leds.leds[i].name); |
128 | if (pdata->leds.leds[i].default_trigger) | |
75cb2e1d | 129 | pca9633[i].led_cdev.default_trigger = |
2f73c392 | 130 | pdata->leds.leds[i].default_trigger; |
75cb2e1d PM |
131 | } else { |
132 | snprintf(pca9633[i].name, sizeof(pca9633[i].name), | |
133 | "pca9633:%d", i); | |
134 | } | |
135 | ||
136 | pca9633[i].led_cdev.name = pca9633[i].name; | |
137 | pca9633[i].led_cdev.brightness_set = pca9633_led_set; | |
138 | ||
139 | INIT_WORK(&pca9633[i].work, pca9633_led_work); | |
140 | ||
141 | err = led_classdev_register(&client->dev, &pca9633[i].led_cdev); | |
142 | if (err < 0) | |
143 | goto exit; | |
144 | } | |
145 | ||
146 | /* Disable LED all-call address and set normal mode */ | |
147 | i2c_smbus_write_byte_data(client, PCA9633_MODE1, 0x00); | |
148 | ||
2f73c392 PM |
149 | /* Configure output: open-drain or totem pole (push-pull) */ |
150 | if (pdata && pdata->outdrv == PCA9633_OPEN_DRAIN) | |
151 | i2c_smbus_write_byte_data(client, PCA9633_MODE2, 0x01); | |
152 | ||
75cb2e1d PM |
153 | /* Turn off LEDs */ |
154 | i2c_smbus_write_byte_data(client, PCA9633_LEDOUT, 0x00); | |
155 | ||
156 | return 0; | |
157 | ||
158 | exit: | |
159 | while (i--) { | |
160 | led_classdev_unregister(&pca9633[i].led_cdev); | |
161 | cancel_work_sync(&pca9633[i].work); | |
162 | } | |
163 | ||
75cb2e1d PM |
164 | return err; |
165 | } | |
166 | ||
678e8a6b | 167 | static int pca9633_remove(struct i2c_client *client) |
75cb2e1d PM |
168 | { |
169 | struct pca9633_led *pca9633 = i2c_get_clientdata(client); | |
170 | int i; | |
171 | ||
172 | for (i = 0; i < 4; i++) { | |
173 | led_classdev_unregister(&pca9633[i].led_cdev); | |
174 | cancel_work_sync(&pca9633[i].work); | |
175 | } | |
176 | ||
75cb2e1d PM |
177 | return 0; |
178 | } | |
179 | ||
180 | static struct i2c_driver pca9633_driver = { | |
181 | .driver = { | |
182 | .name = "leds-pca9633", | |
183 | .owner = THIS_MODULE, | |
184 | }, | |
185 | .probe = pca9633_probe, | |
df07cf81 | 186 | .remove = pca9633_remove, |
75cb2e1d PM |
187 | .id_table = pca9633_id, |
188 | }; | |
189 | ||
190 | module_i2c_driver(pca9633_driver); | |
191 | ||
192 | MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>"); | |
193 | MODULE_DESCRIPTION("PCA9633 LED driver"); | |
194 | MODULE_LICENSE("GPL v2"); |