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 parent = of_get_child_by_name(dev->parent->of_node, "leds"); 138 if (!parent) 139 goto out_node_put; 140 141 ret = of_property_read_u32_array(parent, "led-control", 142 pdata->led_control, 143 leds->devtype->num_regs); 144 if (ret) 145 goto out_node_put; 146 147 pdata->num_leds = of_get_child_count(parent); 148 149 pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led), 150 GFP_KERNEL); 151 if (!pdata->led) { 152 ret = -ENOMEM; 153 goto out_node_put; 154 } 155 156 for_each_child_of_node(parent, child) { 157 const char *str; 158 u32 tmp; 159 160 if (of_property_read_u32(child, "reg", &tmp)) 161 continue; 162 pdata->led[i].id = leds->devtype->led_min + tmp; 163 164 if (!of_property_read_string(child, "label", &str)) 165 pdata->led[i].name = str; 166 if (!of_property_read_string(child, "linux,default-trigger", 167 &str)) 168 pdata->led[i].default_trigger = str; 169 170 i++; 171 } 172 173 pdata->num_leds = i; 174 ret = i > 0 ? 0 : -ENODATA; 175 176 out_node_put: 177 of_node_put(parent); 178 179 return ret ? ERR_PTR(ret) : pdata; 180 } 181 #else 182 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( 183 struct platform_device *pdev) 184 { 185 return ERR_PTR(-ENOSYS); 186 } 187 #endif 188 189 static int __init mc13xxx_led_probe(struct platform_device *pdev) 190 { 191 struct device *dev = &pdev->dev; 192 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev); 193 struct mc13xxx *mcdev = dev_get_drvdata(dev->parent); 194 struct mc13xxx_led_devtype *devtype = 195 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data; 196 struct mc13xxx_leds *leds; 197 int i, id, ret = -ENODATA; 198 u32 init_led = 0; 199 200 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL); 201 if (!leds) 202 return -ENOMEM; 203 204 leds->devtype = devtype; 205 leds->master = mcdev; 206 platform_set_drvdata(pdev, leds); 207 208 if (dev->parent->of_node) { 209 pdata = mc13xxx_led_probe_dt(pdev); 210 if (IS_ERR(pdata)) 211 return PTR_ERR(pdata); 212 } else if (!pdata) 213 return -ENODATA; 214 215 leds->num_leds = pdata->num_leds; 216 217 if ((leds->num_leds < 1) || 218 (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) { 219 dev_err(dev, "Invalid LED count %d\n", leds->num_leds); 220 return -EINVAL; 221 } 222 223 leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led), 224 GFP_KERNEL); 225 if (!leds->led) 226 return -ENOMEM; 227 228 for (i = 0; i < devtype->num_regs; i++) { 229 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i, 230 pdata->led_control[i]); 231 if (ret) 232 return ret; 233 } 234 235 for (i = 0; i < leds->num_leds; i++) { 236 const char *name, *trig; 237 238 ret = -EINVAL; 239 240 id = pdata->led[i].id; 241 name = pdata->led[i].name; 242 trig = pdata->led[i].default_trigger; 243 244 if ((id > devtype->led_max) || (id < devtype->led_min)) { 245 dev_err(dev, "Invalid ID %i\n", id); 246 break; 247 } 248 249 if (init_led & (1 << id)) { 250 dev_warn(dev, "LED %i already initialized\n", id); 251 break; 252 } 253 254 init_led |= 1 << id; 255 leds->led[i].id = id; 256 leds->led[i].leds = leds; 257 leds->led[i].cdev.name = name; 258 leds->led[i].cdev.default_trigger = trig; 259 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME; 260 leds->led[i].cdev.brightness_set = mc13xxx_led_set; 261 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id); 262 263 INIT_WORK(&leds->led[i].work, mc13xxx_led_work); 264 265 ret = led_classdev_register(dev->parent, &leds->led[i].cdev); 266 if (ret) { 267 dev_err(dev, "Failed to register LED %i\n", id); 268 break; 269 } 270 } 271 272 if (ret) 273 while (--i >= 0) { 274 led_classdev_unregister(&leds->led[i].cdev); 275 cancel_work_sync(&leds->led[i].work); 276 } 277 278 return ret; 279 } 280 281 static int mc13xxx_led_remove(struct platform_device *pdev) 282 { 283 struct mc13xxx_leds *leds = platform_get_drvdata(pdev); 284 int i; 285 286 for (i = 0; i < leds->num_leds; i++) { 287 led_classdev_unregister(&leds->led[i].cdev); 288 cancel_work_sync(&leds->led[i].work); 289 } 290 291 return 0; 292 } 293 294 static const struct mc13xxx_led_devtype mc13783_led_devtype = { 295 .led_min = MC13783_LED_MD, 296 .led_max = MC13783_LED_B3, 297 .num_regs = 6, 298 .ledctrl_base = 51, 299 }; 300 301 static const struct mc13xxx_led_devtype mc13892_led_devtype = { 302 .led_min = MC13892_LED_MD, 303 .led_max = MC13892_LED_B, 304 .num_regs = 4, 305 .ledctrl_base = 51, 306 }; 307 308 static const struct mc13xxx_led_devtype mc34708_led_devtype = { 309 .led_min = MC34708_LED_R, 310 .led_max = MC34708_LED_G, 311 .num_regs = 1, 312 .ledctrl_base = 54, 313 }; 314 315 static const struct platform_device_id mc13xxx_led_id_table[] = { 316 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, }, 317 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, }, 318 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, }, 319 { } 320 }; 321 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table); 322 323 static struct platform_driver mc13xxx_led_driver = { 324 .driver = { 325 .name = "mc13xxx-led", 326 }, 327 .remove = mc13xxx_led_remove, 328 .id_table = mc13xxx_led_id_table, 329 }; 330 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe); 331 332 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC"); 333 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>"); 334 MODULE_LICENSE("GPL"); 335