Root/
| 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> |
| 25 | |
| 26 | /* LED select registers determine the source that drives LED outputs */ |
| 27 | #define PCA9633_LED_OFF 0x0 /* LED driver off */ |
| 28 | #define PCA9633_LED_ON 0x1 /* LED driver on */ |
| 29 | #define PCA9633_LED_PWM 0x2 /* Controlled through PWM */ |
| 30 | #define PCA9633_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */ |
| 31 | |
| 32 | #define PCA9633_MODE1 0x00 |
| 33 | #define PCA9633_MODE2 0x01 |
| 34 | #define PCA9633_PWM_BASE 0x02 |
| 35 | #define PCA9633_LEDOUT 0x08 |
| 36 | |
| 37 | static const struct i2c_device_id pca9633_id[] = { |
| 38 | { "pca9633", 0 }, |
| 39 | { } |
| 40 | }; |
| 41 | MODULE_DEVICE_TABLE(i2c, pca9633_id); |
| 42 | |
| 43 | struct pca9633_led { |
| 44 | struct i2c_client *client; |
| 45 | struct work_struct work; |
| 46 | enum led_brightness brightness; |
| 47 | struct led_classdev led_cdev; |
| 48 | int led_num; /* 0 .. 3 potentially */ |
| 49 | char name[32]; |
| 50 | }; |
| 51 | |
| 52 | static void pca9633_led_work(struct work_struct *work) |
| 53 | { |
| 54 | struct pca9633_led *pca9633 = container_of(work, |
| 55 | struct pca9633_led, work); |
| 56 | u8 ledout = i2c_smbus_read_byte_data(pca9633->client, PCA9633_LEDOUT); |
| 57 | int shift = 2 * pca9633->led_num; |
| 58 | u8 mask = 0x3 << shift; |
| 59 | |
| 60 | switch (pca9633->brightness) { |
| 61 | case LED_FULL: |
| 62 | i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, |
| 63 | (ledout & ~mask) | (PCA9633_LED_ON << shift)); |
| 64 | break; |
| 65 | case LED_OFF: |
| 66 | i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, |
| 67 | ledout & ~mask); |
| 68 | break; |
| 69 | default: |
| 70 | i2c_smbus_write_byte_data(pca9633->client, |
| 71 | PCA9633_PWM_BASE + pca9633->led_num, |
| 72 | pca9633->brightness); |
| 73 | i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT, |
| 74 | (ledout & ~mask) | (PCA9633_LED_PWM << shift)); |
| 75 | break; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | static void pca9633_led_set(struct led_classdev *led_cdev, |
| 80 | enum led_brightness value) |
| 81 | { |
| 82 | struct pca9633_led *pca9633; |
| 83 | |
| 84 | pca9633 = container_of(led_cdev, struct pca9633_led, led_cdev); |
| 85 | |
| 86 | pca9633->brightness = value; |
| 87 | |
| 88 | /* |
| 89 | * Must use workqueue for the actual I/O since I2C operations |
| 90 | * can sleep. |
| 91 | */ |
| 92 | schedule_work(&pca9633->work); |
| 93 | } |
| 94 | |
| 95 | static int __devinit pca9633_probe(struct i2c_client *client, |
| 96 | const struct i2c_device_id *id) |
| 97 | { |
| 98 | struct pca9633_led *pca9633; |
| 99 | struct led_platform_data *pdata; |
| 100 | int i, err; |
| 101 | |
| 102 | pdata = client->dev.platform_data; |
| 103 | |
| 104 | if (pdata) { |
| 105 | if (pdata->num_leds <= 0 || pdata->num_leds > 4) { |
| 106 | dev_err(&client->dev, "board info must claim at most 4 LEDs"); |
| 107 | return -EINVAL; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | pca9633 = devm_kzalloc(&client->dev, 4 * sizeof(*pca9633), GFP_KERNEL); |
| 112 | if (!pca9633) |
| 113 | return -ENOMEM; |
| 114 | |
| 115 | i2c_set_clientdata(client, pca9633); |
| 116 | |
| 117 | for (i = 0; i < 4; i++) { |
| 118 | pca9633[i].client = client; |
| 119 | pca9633[i].led_num = i; |
| 120 | |
| 121 | /* Platform data can specify LED names and default triggers */ |
| 122 | if (pdata && i < pdata->num_leds) { |
| 123 | if (pdata->leds[i].name) |
| 124 | snprintf(pca9633[i].name, |
| 125 | sizeof(pca9633[i].name), "pca9633:%s", |
| 126 | pdata->leds[i].name); |
| 127 | if (pdata->leds[i].default_trigger) |
| 128 | pca9633[i].led_cdev.default_trigger = |
| 129 | pdata->leds[i].default_trigger; |
| 130 | } else { |
| 131 | snprintf(pca9633[i].name, sizeof(pca9633[i].name), |
| 132 | "pca9633:%d", i); |
| 133 | } |
| 134 | |
| 135 | pca9633[i].led_cdev.name = pca9633[i].name; |
| 136 | pca9633[i].led_cdev.brightness_set = pca9633_led_set; |
| 137 | |
| 138 | INIT_WORK(&pca9633[i].work, pca9633_led_work); |
| 139 | |
| 140 | err = led_classdev_register(&client->dev, &pca9633[i].led_cdev); |
| 141 | if (err < 0) |
| 142 | goto exit; |
| 143 | } |
| 144 | |
| 145 | /* Disable LED all-call address and set normal mode */ |
| 146 | i2c_smbus_write_byte_data(client, PCA9633_MODE1, 0x00); |
| 147 | |
| 148 | /* Turn off LEDs */ |
| 149 | i2c_smbus_write_byte_data(client, PCA9633_LEDOUT, 0x00); |
| 150 | |
| 151 | return 0; |
| 152 | |
| 153 | exit: |
| 154 | while (i--) { |
| 155 | led_classdev_unregister(&pca9633[i].led_cdev); |
| 156 | cancel_work_sync(&pca9633[i].work); |
| 157 | } |
| 158 | |
| 159 | return err; |
| 160 | } |
| 161 | |
| 162 | static int __devexit pca9633_remove(struct i2c_client *client) |
| 163 | { |
| 164 | struct pca9633_led *pca9633 = i2c_get_clientdata(client); |
| 165 | int i; |
| 166 | |
| 167 | for (i = 0; i < 4; i++) { |
| 168 | led_classdev_unregister(&pca9633[i].led_cdev); |
| 169 | cancel_work_sync(&pca9633[i].work); |
| 170 | } |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static struct i2c_driver pca9633_driver = { |
| 176 | .driver = { |
| 177 | .name = "leds-pca9633", |
| 178 | .owner = THIS_MODULE, |
| 179 | }, |
| 180 | .probe = pca9633_probe, |
| 181 | .remove = __devexit_p(pca9633_remove), |
| 182 | .id_table = pca9633_id, |
| 183 | }; |
| 184 | |
| 185 | module_i2c_driver(pca9633_driver); |
| 186 | |
| 187 | MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>"); |
| 188 | MODULE_DESCRIPTION("PCA9633 LED driver"); |
| 189 | MODULE_LICENSE("GPL v2"); |
| 190 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
