1 /* 2 * LED driver for Marvell 88PM860x 3 * 4 * Copyright (C) 2009 Marvell International Ltd. 5 * Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h> 14 #include <linux/init.h> 15 #include <linux/platform_device.h> 16 #include <linux/i2c.h> 17 #include <linux/leds.h> 18 #include <linux/slab.h> 19 #include <linux/workqueue.h> 20 #include <linux/mfd/88pm860x.h> 21 22 #define LED_PWM_SHIFT (3) 23 #define LED_PWM_MASK (0x1F) 24 #define LED_CURRENT_MASK (0x07 << 5) 25 26 #define LED_BLINK_ON_MASK (0x07) 27 #define LED_BLINK_PERIOD_MASK (0x0F << 3) 28 #define LED_BLINK_MASK (0x7F) 29 30 #define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66) 31 #define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930) 32 #define LED_BLINK_ON_MIN LED_BLINK_ON(0) 33 #define LED_BLINK_ON_MAX LED_BLINK_ON(0x7) 34 #define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0) 35 #define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE) 36 #define LED_TO_ON(x) ((x - 66) / 66) 37 #define LED_TO_PERIOD(x) ((x - 930) / 530) 38 39 #define LED1_BLINK_EN (1 << 1) 40 #define LED2_BLINK_EN (1 << 2) 41 42 enum { 43 SET_BRIGHTNESS, 44 SET_BLINK, 45 }; 46 47 struct pm860x_led { 48 struct led_classdev cdev; 49 struct i2c_client *i2c; 50 struct work_struct work; 51 struct pm860x_chip *chip; 52 struct mutex lock; 53 char name[MFD_NAME_SIZE]; 54 55 int port; 56 int iset; 57 int command; 58 int offset; 59 unsigned char brightness; 60 unsigned char current_brightness; 61 62 int blink_data; 63 int blink_time; 64 int blink_on; 65 int blink_off; 66 }; 67 68 /* return offset of color register */ 69 static inline int __led_off(int port) 70 { 71 int ret = -EINVAL; 72 73 switch (port) { 74 case PM8606_LED1_RED: 75 case PM8606_LED1_GREEN: 76 case PM8606_LED1_BLUE: 77 ret = port - PM8606_LED1_RED + PM8606_RGB1B; 78 break; 79 case PM8606_LED2_RED: 80 case PM8606_LED2_GREEN: 81 case PM8606_LED2_BLUE: 82 ret = port - PM8606_LED2_RED + PM8606_RGB2B; 83 break; 84 } 85 return ret; 86 } 87 88 /* return offset of blink register */ 89 static inline int __blink_off(int port) 90 { 91 int ret = -EINVAL; 92 93 switch (port) { 94 case PM8606_LED1_RED: 95 case PM8606_LED1_GREEN: 96 case PM8606_LED1_BLUE: 97 ret = PM8606_RGB1A; 98 case PM8606_LED2_RED: 99 case PM8606_LED2_GREEN: 100 case PM8606_LED2_BLUE: 101 ret = PM8606_RGB2A; 102 } 103 return ret; 104 } 105 106 static inline int __blink_ctl_mask(int port) 107 { 108 int ret = -EINVAL; 109 110 switch (port) { 111 case PM8606_LED1_RED: 112 case PM8606_LED1_GREEN: 113 case PM8606_LED1_BLUE: 114 ret = LED1_BLINK_EN; 115 break; 116 case PM8606_LED2_RED: 117 case PM8606_LED2_GREEN: 118 case PM8606_LED2_BLUE: 119 ret = LED2_BLINK_EN; 120 break; 121 } 122 return ret; 123 } 124 125 static int __led_set(struct pm860x_led *led, int command) 126 { 127 struct pm860x_chip *chip = led->chip; 128 int mask, ret; 129 130 mutex_lock(&led->lock); 131 switch (command) { 132 case SET_BRIGHTNESS: 133 if ((led->current_brightness == 0) && led->brightness) { 134 if (led->iset) { 135 ret = pm860x_set_bits(led->i2c, led->offset, 136 LED_CURRENT_MASK, led->iset); 137 if (ret < 0) 138 goto out; 139 } 140 } else if (led->brightness == 0) { 141 ret = pm860x_set_bits(led->i2c, led->offset, 142 LED_CURRENT_MASK, 0); 143 if (ret < 0) 144 goto out; 145 } 146 ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK, 147 led->brightness); 148 if (ret < 0) 149 goto out; 150 led->current_brightness = led->brightness; 151 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", 152 led->offset, led->brightness); 153 break; 154 case SET_BLINK: 155 ret = pm860x_set_bits(led->i2c, led->offset, 156 LED_BLINK_MASK, led->blink_data); 157 if (ret < 0) 158 goto out; 159 160 mask = __blink_ctl_mask(led->port); 161 ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask); 162 if (ret < 0) 163 goto out; 164 dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n", 165 led->blink_on, led->blink_off); 166 break; 167 } 168 out: 169 mutex_unlock(&led->lock); 170 return 0; 171 } 172 173 static void pm860x_led_work(struct work_struct *work) 174 { 175 struct pm860x_led *led; 176 177 led = container_of(work, struct pm860x_led, work); 178 __led_set(led, led->command); 179 } 180 181 static void pm860x_led_set(struct led_classdev *cdev, 182 enum led_brightness value) 183 { 184 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); 185 186 data->offset = __led_off(data->port); 187 data->brightness = value >> 3; 188 data->command = SET_BRIGHTNESS; 189 schedule_work(&data->work); 190 } 191 192 static int pm860x_led_blink(struct led_classdev *cdev, 193 unsigned long *delay_on, 194 unsigned long *delay_off) 195 { 196 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); 197 int period, on; 198 199 on = *delay_on; 200 if ((on < LED_BLINK_ON_MIN) || (on > LED_BLINK_ON_MAX)) 201 return -EINVAL; 202 203 on = LED_TO_ON(on); 204 on = LED_BLINK_ON(on); 205 206 period = on + *delay_off; 207 if ((period < LED_BLINK_PERIOD_MIN) || (period > LED_BLINK_PERIOD_MAX)) 208 return -EINVAL; 209 period = LED_TO_PERIOD(period); 210 period = LED_BLINK_PERIOD(period); 211 212 data->offset = __blink_off(data->port); 213 data->blink_on = on; 214 data->blink_off = period - data->blink_on; 215 data->blink_data = (period << 3) | data->blink_on; 216 data->command = SET_BLINK; 217 schedule_work(&data->work); 218 219 return 0; 220 } 221 222 static int __check_device(struct pm860x_led_pdata *pdata, char *name) 223 { 224 struct pm860x_led_pdata *p = pdata; 225 int ret = -EINVAL; 226 227 while (p && p->id) { 228 if ((p->id != PM8606_ID_LED) || (p->flags < 0)) 229 break; 230 231 if (!strncmp(name, pm860x_led_name[p->flags], 232 MFD_NAME_SIZE)) { 233 ret = (int)p->flags; 234 break; 235 } 236 p++; 237 } 238 return ret; 239 } 240 241 static int pm860x_led_probe(struct platform_device *pdev) 242 { 243 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 244 struct pm860x_platform_data *pm860x_pdata; 245 struct pm860x_led_pdata *pdata; 246 struct pm860x_led *data; 247 struct resource *res; 248 int ret; 249 250 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 251 if (res == NULL) { 252 dev_err(&pdev->dev, "No I/O resource!\n"); 253 return -EINVAL; 254 } 255 256 if (pdev->dev.parent->platform_data) { 257 pm860x_pdata = pdev->dev.parent->platform_data; 258 pdata = pm860x_pdata->led; 259 } else 260 pdata = NULL; 261 262 data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL); 263 if (data == NULL) 264 return -ENOMEM; 265 strncpy(data->name, res->name, MFD_NAME_SIZE); 266 dev_set_drvdata(&pdev->dev, data); 267 data->chip = chip; 268 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; 269 data->iset = pdata->iset; 270 data->port = __check_device(pdata, data->name); 271 if (data->port < 0) 272 return -EINVAL; 273 274 data->current_brightness = 0; 275 data->cdev.name = data->name; 276 data->cdev.brightness_set = pm860x_led_set; 277 data->cdev.blink_set = pm860x_led_blink; 278 mutex_init(&data->lock); 279 INIT_WORK(&data->work, pm860x_led_work); 280 281 ret = led_classdev_register(chip->dev, &data->cdev); 282 if (ret < 0) { 283 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); 284 goto out; 285 } 286 return 0; 287 out: 288 kfree(data); 289 return ret; 290 } 291 292 static int pm860x_led_remove(struct platform_device *pdev) 293 { 294 struct pm860x_led *data = platform_get_drvdata(pdev); 295 296 led_classdev_unregister(&data->cdev); 297 kfree(data); 298 299 return 0; 300 } 301 302 static struct platform_driver pm860x_led_driver = { 303 .driver = { 304 .name = "88pm860x-led", 305 .owner = THIS_MODULE, 306 }, 307 .probe = pm860x_led_probe, 308 .remove = pm860x_led_remove, 309 }; 310 311 static int __devinit pm860x_led_init(void) 312 { 313 return platform_driver_register(&pm860x_led_driver); 314 } 315 module_init(pm860x_led_init); 316 317 static void __devexit pm860x_led_exit(void) 318 { 319 platform_driver_unregister(&pm860x_led_driver); 320 } 321 module_exit(pm860x_led_exit); 322 323 MODULE_DESCRIPTION("LED driver for Marvell PM860x"); 324 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 325 MODULE_LICENSE("GPL"); 326 MODULE_ALIAS("platform:88pm860x-led"); 327