1 /* 2 * LEDs driver for Freescale MC13783/MC13892/MC34708 3 * 4 * Copyright (C) 2010 Philippe Rétornaz 5 * 6 * Based on leds-da903x: 7 * Copyright (C) 2008 Compulab, Ltd. 8 * Mike Rapoport <mike@compulab.co.il> 9 * 10 * Copyright (C) 2006-2008 Marvell International Ltd. 11 * Eric Miao <eric.miao@marvell.com> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/platform_device.h> 21 #include <linux/leds.h> 22 #include <linux/of.h> 23 #include <linux/workqueue.h> 24 #include <linux/mfd/mc13xxx.h> 25 26 struct mc13xxx_led_devtype { 27 int led_min; 28 int led_max; 29 int num_regs; 30 u32 ledctrl_base; 31 }; 32 33 struct mc13xxx_led { 34 struct led_classdev cdev; 35 struct work_struct work; 36 enum led_brightness new_brightness; 37 int id; 38 struct mc13xxx_leds *leds; 39 }; 40 41 struct mc13xxx_leds { 42 struct mc13xxx *master; 43 struct mc13xxx_led_devtype *devtype; 44 int num_leds; 45 struct mc13xxx_led *led; 46 }; 47 48 static unsigned int mc13xxx_max_brightness(int id) 49 { 50 if (id >= MC13783_LED_MD && id <= MC13783_LED_KP) 51 return 0x0f; 52 else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3) 53 return 0x1f; 54 55 return 0x3f; 56 } 57 58 static void mc13xxx_led_work(struct work_struct *work) 59 { 60 struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work); 61 struct mc13xxx_leds *leds = led->leds; 62 unsigned int reg, bank, off, shift; 63 64 switch (led->id) { 65 case MC13783_LED_MD: 66 case MC13783_LED_AD: 67 case MC13783_LED_KP: 68 reg = 2; 69 shift = 9 + (led->id - MC13783_LED_MD) * 4; 70 break; 71 case MC13783_LED_R1: 72 case MC13783_LED_G1: 73 case MC13783_LED_B1: 74 case MC13783_LED_R2: 75 case MC13783_LED_G2: 76 case MC13783_LED_B2: 77 case MC13783_LED_R3: 78 case MC13783_LED_G3: 79 case MC13783_LED_B3: 80 off = led->id - MC13783_LED_R1; 81 bank = off / 3; 82 reg = 3 + bank; 83 shift = (off - bank * 3) * 5 + 6; 84 break; 85 case MC13892_LED_MD: 86 case MC13892_LED_AD: 87 case MC13892_LED_KP: 88 reg = (led->id - MC13892_LED_MD) / 2; 89 shift = 3 + (led->id - MC13892_LED_MD) * 12; 90 break; 91 case MC13892_LED_R: 92 case MC13892_LED_G: 93 case MC13892_LED_B: 94 off = led->id - MC13892_LED_R; 95 bank = off / 2; 96 reg = 2 + bank; 97 shift = (off - bank * 2) * 12 + 3; 98 break; 99 case MC34708_LED_R: 100 case MC34708_LED_G: 101 reg = 0; 102 shift = 3 + (led->id - MC34708_LED_R) * 12; 103 break; 104 default: 105 BUG(); 106 } 107 108 mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg, 109 mc13xxx_max_brightness(led->id) << shift, 110 led->new_brightness << shift); 111 } 112 113 static void mc13xxx_led_set(struct led_classdev *led_cdev, 114 enum led_brightness value) 115 { 116 struct mc13xxx_led *led = 117 container_of(led_cdev, struct mc13xxx_led, cdev); 118 119 led->new_brightness = value; 120 schedule_work(&led->work); 121 } 122 123 #ifdef CONFIG_OF 124 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( 125 struct platform_device *pdev) 126 { 127 struct mc13xxx_leds *leds = platform_get_drvdata(pdev); 128 struct mc13xxx_leds_platform_data *pdata; 129 struct device_node *parent, *child; 130 struct device *dev = &pdev->dev; 131 int i = 0, ret = -ENODATA; 132 133 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 134 if (!pdata) 135 return ERR_PTR(-ENOMEM); 136 137 of_node_get(dev->parent->of_node); 138 139 parent = of_find_node_by_name(dev->parent->of_node, "leds"); 140 if (!parent) 141 goto out_node_put; 142 143 ret = of_property_read_u32_array(parent, "led-control", 144 pdata->led_control, 145 leds->devtype->num_regs); 146 if (ret) 147 goto out_node_put; 148 149 pdata->num_leds = of_get_child_count(parent); 150 151 pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led), 152 GFP_KERNEL); 153 if (!pdata->led) { 154 ret = -ENOMEM; 155 goto out_node_put; 156 } 157 158 for_each_child_of_node(parent, child) { 159 const char *str; 160 u32 tmp; 161 162 if (of_property_read_u32(child, "reg", &tmp)) 163 continue; 164 pdata->led[i].id = leds->devtype->led_min + tmp; 165 166 if (!of_property_read_string(child, "label", &str)) 167 pdata->led[i].name = str; 168 if (!of_property_read_string(child, "linux,default-trigger", 169 &str)) 170 pdata->led[i].default_trigger = str; 171 172 i++; 173 } 174 175 pdata->num_leds = i; 176 ret = i > 0 ? 0 : -ENODATA; 177 178 out_node_put: 179 of_node_put(parent); 180 181 return ret ? ERR_PTR(ret) : pdata; 182 } 183 #else 184 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( 185 struct platform_device *pdev) 186 { 187 return ERR_PTR(-ENOSYS); 188 } 189 #endif 190 191 static int __init mc13xxx_led_probe(struct platform_device *pdev) 192 { 193 struct device *dev = &pdev->dev; 194 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev); 195 struct mc13xxx *mcdev = dev_get_drvdata(dev->parent); 196 struct mc13xxx_led_devtype *devtype = 197 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data; 198 struct mc13xxx_leds *leds; 199 int i, id, ret = -ENODATA; 200 u32 init_led = 0; 201 202 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL); 203 if (!leds) 204 return -ENOMEM; 205 206 leds->devtype = devtype; 207 leds->master = mcdev; 208 platform_set_drvdata(pdev, leds); 209 210 if (dev->parent->of_node) { 211 pdata = mc13xxx_led_probe_dt(pdev); 212 if (IS_ERR(pdata)) 213 return PTR_ERR(pdata); 214 } else if (!pdata) 215 return -ENODATA; 216 217 leds->num_leds = pdata->num_leds; 218 219 if ((leds->num_leds < 1) || 220 (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) { 221 dev_err(dev, "Invalid LED count %d\n", leds->num_leds); 222 return -EINVAL; 223 } 224 225 leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led), 226 GFP_KERNEL); 227 if (!leds->led) 228 return -ENOMEM; 229 230 for (i = 0; i < devtype->num_regs; i++) { 231 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i, 232 pdata->led_control[i]); 233 if (ret) 234 return ret; 235 } 236 237 for (i = 0; i < leds->num_leds; i++) { 238 const char *name, *trig; 239 240 ret = -EINVAL; 241 242 id = pdata->led[i].id; 243 name = pdata->led[i].name; 244 trig = pdata->led[i].default_trigger; 245 246 if ((id > devtype->led_max) || (id < devtype->led_min)) { 247 dev_err(dev, "Invalid ID %i\n", id); 248 break; 249 } 250 251 if (init_led & (1 << id)) { 252 dev_warn(dev, "LED %i already initialized\n", id); 253 break; 254 } 255 256 init_led |= 1 << id; 257 leds->led[i].id = id; 258 leds->led[i].leds = leds; 259 leds->led[i].cdev.name = name; 260 leds->led[i].cdev.default_trigger = trig; 261 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME; 262 leds->led[i].cdev.brightness_set = mc13xxx_led_set; 263 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id); 264 265 INIT_WORK(&leds->led[i].work, mc13xxx_led_work); 266 267 ret = led_classdev_register(dev->parent, &leds->led[i].cdev); 268 if (ret) { 269 dev_err(dev, "Failed to register LED %i\n", id); 270 break; 271 } 272 } 273 274 if (ret) 275 while (--i >= 0) { 276 led_classdev_unregister(&leds->led[i].cdev); 277 cancel_work_sync(&leds->led[i].work); 278 } 279 280 return ret; 281 } 282 283 static int mc13xxx_led_remove(struct platform_device *pdev) 284 { 285 struct mc13xxx_leds *leds = platform_get_drvdata(pdev); 286 int i; 287 288 for (i = 0; i < leds->num_leds; i++) { 289 led_classdev_unregister(&leds->led[i].cdev); 290 cancel_work_sync(&leds->led[i].work); 291 } 292 293 return 0; 294 } 295 296 static const struct mc13xxx_led_devtype mc13783_led_devtype = { 297 .led_min = MC13783_LED_MD, 298 .led_max = MC13783_LED_B3, 299 .num_regs = 6, 300 .ledctrl_base = 51, 301 }; 302 303 static const struct mc13xxx_led_devtype mc13892_led_devtype = { 304 .led_min = MC13892_LED_MD, 305 .led_max = MC13892_LED_B, 306 .num_regs = 4, 307 .ledctrl_base = 51, 308 }; 309 310 static const struct mc13xxx_led_devtype mc34708_led_devtype = { 311 .led_min = MC34708_LED_R, 312 .led_max = MC34708_LED_G, 313 .num_regs = 1, 314 .ledctrl_base = 54, 315 }; 316 317 static const struct platform_device_id mc13xxx_led_id_table[] = { 318 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, }, 319 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, }, 320 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, }, 321 { } 322 }; 323 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table); 324 325 static struct platform_driver mc13xxx_led_driver = { 326 .driver = { 327 .name = "mc13xxx-led", 328 }, 329 .remove = mc13xxx_led_remove, 330 .id_table = mc13xxx_led_id_table, 331 }; 332 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe); 333 334 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC"); 335 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>"); 336 MODULE_LICENSE("GPL"); 337