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