1 /* 2 * leds-max8997.c - LED class driver for MAX8997 LEDs. 3 * 4 * Copyright (C) 2011 Samsung Electronics 5 * Donggeun Kim <dg77.kim@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 */ 12 13 #include <linux/module.h> 14 #include <linux/err.h> 15 #include <linux/slab.h> 16 #include <linux/workqueue.h> 17 #include <linux/leds.h> 18 #include <linux/mfd/max8997.h> 19 #include <linux/mfd/max8997-private.h> 20 #include <linux/platform_device.h> 21 22 #define MAX8997_LED_FLASH_SHIFT 3 23 #define MAX8997_LED_FLASH_CUR_MASK 0xf8 24 #define MAX8997_LED_MOVIE_SHIFT 4 25 #define MAX8997_LED_MOVIE_CUR_MASK 0xf0 26 27 #define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f 28 #define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf 29 #define MAX8997_LED_NONE_MAX_BRIGHTNESS 0 30 31 #define MAX8997_LED0_FLASH_MASK 0x1 32 #define MAX8997_LED0_FLASH_PIN_MASK 0x5 33 #define MAX8997_LED0_MOVIE_MASK 0x8 34 #define MAX8997_LED0_MOVIE_PIN_MASK 0x28 35 36 #define MAX8997_LED1_FLASH_MASK 0x2 37 #define MAX8997_LED1_FLASH_PIN_MASK 0x6 38 #define MAX8997_LED1_MOVIE_MASK 0x10 39 #define MAX8997_LED1_MOVIE_PIN_MASK 0x30 40 41 #define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6) 42 43 struct max8997_led { 44 struct max8997_dev *iodev; 45 struct led_classdev cdev; 46 bool enabled; 47 int id; 48 enum max8997_led_mode led_mode; 49 struct mutex mutex; 50 }; 51 52 static void max8997_led_set_mode(struct max8997_led *led, 53 enum max8997_led_mode mode) 54 { 55 int ret; 56 struct i2c_client *client = led->iodev->i2c; 57 u8 mask = 0, val; 58 59 switch (mode) { 60 case MAX8997_FLASH_MODE: 61 mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK; 62 val = led->id ? 63 MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK; 64 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS; 65 break; 66 case MAX8997_MOVIE_MODE: 67 mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK; 68 val = led->id ? 69 MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK; 70 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS; 71 break; 72 case MAX8997_FLASH_PIN_CONTROL_MODE: 73 mask = MAX8997_LED1_FLASH_PIN_MASK | 74 MAX8997_LED0_FLASH_PIN_MASK; 75 val = led->id ? 76 MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK; 77 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS; 78 break; 79 case MAX8997_MOVIE_PIN_CONTROL_MODE: 80 mask = MAX8997_LED1_MOVIE_PIN_MASK | 81 MAX8997_LED0_MOVIE_PIN_MASK; 82 val = led->id ? 83 MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK; 84 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS; 85 break; 86 default: 87 led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS; 88 break; 89 } 90 91 if (mask) { 92 ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val, 93 mask); 94 if (ret) 95 dev_err(led->iodev->dev, 96 "failed to update register(%d)\n", ret); 97 } 98 99 led->led_mode = mode; 100 } 101 102 static void max8997_led_enable(struct max8997_led *led, bool enable) 103 { 104 int ret; 105 struct i2c_client *client = led->iodev->i2c; 106 u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK; 107 108 if (led->enabled == enable) 109 return; 110 111 val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0; 112 113 ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask); 114 if (ret) 115 dev_err(led->iodev->dev, 116 "failed to update register(%d)\n", ret); 117 118 led->enabled = enable; 119 } 120 121 static void max8997_led_set_current(struct max8997_led *led, 122 enum led_brightness value) 123 { 124 int ret; 125 struct i2c_client *client = led->iodev->i2c; 126 u8 val = 0, mask = 0, reg = 0; 127 128 switch (led->led_mode) { 129 case MAX8997_FLASH_MODE: 130 case MAX8997_FLASH_PIN_CONTROL_MODE: 131 val = value << MAX8997_LED_FLASH_SHIFT; 132 mask = MAX8997_LED_FLASH_CUR_MASK; 133 reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR; 134 break; 135 case MAX8997_MOVIE_MODE: 136 case MAX8997_MOVIE_PIN_CONTROL_MODE: 137 val = value << MAX8997_LED_MOVIE_SHIFT; 138 mask = MAX8997_LED_MOVIE_CUR_MASK; 139 reg = MAX8997_REG_MOVIE_CUR; 140 break; 141 default: 142 break; 143 } 144 145 if (mask) { 146 ret = max8997_update_reg(client, reg, val, mask); 147 if (ret) 148 dev_err(led->iodev->dev, 149 "failed to update register(%d)\n", ret); 150 } 151 } 152 153 static void max8997_led_brightness_set(struct led_classdev *led_cdev, 154 enum led_brightness value) 155 { 156 struct max8997_led *led = 157 container_of(led_cdev, struct max8997_led, cdev); 158 159 if (value) { 160 max8997_led_set_current(led, value); 161 max8997_led_enable(led, true); 162 } else { 163 max8997_led_set_current(led, value); 164 max8997_led_enable(led, false); 165 } 166 } 167 168 static ssize_t max8997_led_show_mode(struct device *dev, 169 struct device_attribute *attr, char *buf) 170 { 171 struct led_classdev *led_cdev = dev_get_drvdata(dev); 172 struct max8997_led *led = 173 container_of(led_cdev, struct max8997_led, cdev); 174 ssize_t ret = 0; 175 176 mutex_lock(&led->mutex); 177 178 switch (led->led_mode) { 179 case MAX8997_FLASH_MODE: 180 ret += sprintf(buf, "FLASH\n"); 181 break; 182 case MAX8997_MOVIE_MODE: 183 ret += sprintf(buf, "MOVIE\n"); 184 break; 185 case MAX8997_FLASH_PIN_CONTROL_MODE: 186 ret += sprintf(buf, "FLASH_PIN_CONTROL\n"); 187 break; 188 case MAX8997_MOVIE_PIN_CONTROL_MODE: 189 ret += sprintf(buf, "MOVIE_PIN_CONTROL\n"); 190 break; 191 default: 192 ret += sprintf(buf, "NONE\n"); 193 break; 194 } 195 196 mutex_unlock(&led->mutex); 197 198 return ret; 199 } 200 201 static ssize_t max8997_led_store_mode(struct device *dev, 202 struct device_attribute *attr, 203 const char *buf, size_t size) 204 { 205 struct led_classdev *led_cdev = dev_get_drvdata(dev); 206 struct max8997_led *led = 207 container_of(led_cdev, struct max8997_led, cdev); 208 enum max8997_led_mode mode; 209 210 mutex_lock(&led->mutex); 211 212 if (!strncmp(buf, "FLASH_PIN_CONTROL", 17)) 213 mode = MAX8997_FLASH_PIN_CONTROL_MODE; 214 else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17)) 215 mode = MAX8997_MOVIE_PIN_CONTROL_MODE; 216 else if (!strncmp(buf, "FLASH", 5)) 217 mode = MAX8997_FLASH_MODE; 218 else if (!strncmp(buf, "MOVIE", 5)) 219 mode = MAX8997_MOVIE_MODE; 220 else 221 mode = MAX8997_NONE; 222 223 max8997_led_set_mode(led, mode); 224 225 mutex_unlock(&led->mutex); 226 227 return size; 228 } 229 230 static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode); 231 232 static int max8997_led_probe(struct platform_device *pdev) 233 { 234 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); 235 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev); 236 struct max8997_led *led; 237 char name[20]; 238 int ret = 0; 239 240 if (pdata == NULL) { 241 dev_err(&pdev->dev, "no platform data\n"); 242 return -ENODEV; 243 } 244 245 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); 246 if (led == NULL) 247 return -ENOMEM; 248 249 led->id = pdev->id; 250 snprintf(name, sizeof(name), "max8997-led%d", pdev->id); 251 252 led->cdev.name = name; 253 led->cdev.brightness_set = max8997_led_brightness_set; 254 led->cdev.flags |= LED_CORE_SUSPENDRESUME; 255 led->cdev.brightness = 0; 256 led->iodev = iodev; 257 258 /* initialize mode and brightness according to platform_data */ 259 if (pdata->led_pdata) { 260 u8 mode = 0, brightness = 0; 261 262 mode = pdata->led_pdata->mode[led->id]; 263 brightness = pdata->led_pdata->brightness[led->id]; 264 265 max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]); 266 267 if (brightness > led->cdev.max_brightness) 268 brightness = led->cdev.max_brightness; 269 max8997_led_set_current(led, brightness); 270 led->cdev.brightness = brightness; 271 } else { 272 max8997_led_set_mode(led, MAX8997_NONE); 273 max8997_led_set_current(led, 0); 274 } 275 276 mutex_init(&led->mutex); 277 278 platform_set_drvdata(pdev, led); 279 280 ret = led_classdev_register(&pdev->dev, &led->cdev); 281 if (ret < 0) 282 return ret; 283 284 ret = device_create_file(led->cdev.dev, &dev_attr_mode); 285 if (ret != 0) { 286 dev_err(&pdev->dev, 287 "failed to create file: %d\n", ret); 288 led_classdev_unregister(&led->cdev); 289 return ret; 290 } 291 292 return 0; 293 } 294 295 static int max8997_led_remove(struct platform_device *pdev) 296 { 297 struct max8997_led *led = platform_get_drvdata(pdev); 298 299 device_remove_file(led->cdev.dev, &dev_attr_mode); 300 led_classdev_unregister(&led->cdev); 301 302 return 0; 303 } 304 305 static struct platform_driver max8997_led_driver = { 306 .driver = { 307 .name = "max8997-led", 308 .owner = THIS_MODULE, 309 }, 310 .probe = max8997_led_probe, 311 .remove = max8997_led_remove, 312 }; 313 314 module_platform_driver(max8997_led_driver); 315 316 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); 317 MODULE_DESCRIPTION("MAX8997 LED driver"); 318 MODULE_LICENSE("GPL"); 319 MODULE_ALIAS("platform:max8997-led"); 320