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 off = led->id - MC13892_LED_MD; 88 reg = off / 2; 89 shift = 3 + (off - reg * 2) * 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 return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg, 109 mc13xxx_max_brightness(led->id) << shift, 110 value << shift); 111 } 112 113 #ifdef CONFIG_OF 114 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( 115 struct platform_device *pdev) 116 { 117 struct mc13xxx_leds *leds = platform_get_drvdata(pdev); 118 struct mc13xxx_leds_platform_data *pdata; 119 struct device_node *parent, *child; 120 struct device *dev = &pdev->dev; 121 int i = 0, ret = -ENODATA; 122 123 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 124 if (!pdata) 125 return ERR_PTR(-ENOMEM); 126 127 parent = of_get_child_by_name(dev->parent->of_node, "leds"); 128 if (!parent) 129 goto out_node_put; 130 131 ret = of_property_read_u32_array(parent, "led-control", 132 pdata->led_control, 133 leds->devtype->num_regs); 134 if (ret) 135 goto out_node_put; 136 137 pdata->num_leds = of_get_child_count(parent); 138 139 pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led), 140 GFP_KERNEL); 141 if (!pdata->led) { 142 ret = -ENOMEM; 143 goto out_node_put; 144 } 145 146 for_each_child_of_node(parent, child) { 147 const char *str; 148 u32 tmp; 149 150 if (of_property_read_u32(child, "reg", &tmp)) 151 continue; 152 pdata->led[i].id = leds->devtype->led_min + tmp; 153 154 if (!of_property_read_string(child, "label", &str)) 155 pdata->led[i].name = str; 156 if (!of_property_read_string(child, "linux,default-trigger", 157 &str)) 158 pdata->led[i].default_trigger = str; 159 160 i++; 161 } 162 163 pdata->num_leds = i; 164 ret = i > 0 ? 0 : -ENODATA; 165 166 out_node_put: 167 of_node_put(parent); 168 169 return ret ? ERR_PTR(ret) : pdata; 170 } 171 #else 172 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( 173 struct platform_device *pdev) 174 { 175 return ERR_PTR(-ENOSYS); 176 } 177 #endif 178 179 static int __init mc13xxx_led_probe(struct platform_device *pdev) 180 { 181 struct device *dev = &pdev->dev; 182 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev); 183 struct mc13xxx *mcdev = dev_get_drvdata(dev->parent); 184 struct mc13xxx_led_devtype *devtype = 185 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data; 186 struct mc13xxx_leds *leds; 187 int i, id, ret = -ENODATA; 188 u32 init_led = 0; 189 190 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL); 191 if (!leds) 192 return -ENOMEM; 193 194 leds->devtype = devtype; 195 leds->master = mcdev; 196 platform_set_drvdata(pdev, leds); 197 198 if (dev->parent->of_node) { 199 pdata = mc13xxx_led_probe_dt(pdev); 200 if (IS_ERR(pdata)) 201 return PTR_ERR(pdata); 202 } else if (!pdata) 203 return -ENODATA; 204 205 leds->num_leds = pdata->num_leds; 206 207 if ((leds->num_leds < 1) || 208 (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) { 209 dev_err(dev, "Invalid LED count %d\n", leds->num_leds); 210 return -EINVAL; 211 } 212 213 leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led), 214 GFP_KERNEL); 215 if (!leds->led) 216 return -ENOMEM; 217 218 for (i = 0; i < devtype->num_regs; i++) { 219 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i, 220 pdata->led_control[i]); 221 if (ret) 222 return ret; 223 } 224 225 for (i = 0; i < leds->num_leds; i++) { 226 const char *name, *trig; 227 228 ret = -EINVAL; 229 230 id = pdata->led[i].id; 231 name = pdata->led[i].name; 232 trig = pdata->led[i].default_trigger; 233 234 if ((id > devtype->led_max) || (id < devtype->led_min)) { 235 dev_err(dev, "Invalid ID %i\n", id); 236 break; 237 } 238 239 if (init_led & (1 << id)) { 240 dev_warn(dev, "LED %i already initialized\n", id); 241 break; 242 } 243 244 init_led |= 1 << id; 245 leds->led[i].id = id; 246 leds->led[i].leds = leds; 247 leds->led[i].cdev.name = name; 248 leds->led[i].cdev.default_trigger = trig; 249 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME; 250 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set; 251 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id); 252 253 ret = led_classdev_register(dev->parent, &leds->led[i].cdev); 254 if (ret) { 255 dev_err(dev, "Failed to register LED %i\n", id); 256 break; 257 } 258 } 259 260 if (ret) 261 while (--i >= 0) 262 led_classdev_unregister(&leds->led[i].cdev); 263 264 return ret; 265 } 266 267 static int mc13xxx_led_remove(struct platform_device *pdev) 268 { 269 struct mc13xxx_leds *leds = platform_get_drvdata(pdev); 270 int i; 271 272 for (i = 0; i < leds->num_leds; i++) 273 led_classdev_unregister(&leds->led[i].cdev); 274 275 return 0; 276 } 277 278 static const struct mc13xxx_led_devtype mc13783_led_devtype = { 279 .led_min = MC13783_LED_MD, 280 .led_max = MC13783_LED_B3, 281 .num_regs = 6, 282 .ledctrl_base = 51, 283 }; 284 285 static const struct mc13xxx_led_devtype mc13892_led_devtype = { 286 .led_min = MC13892_LED_MD, 287 .led_max = MC13892_LED_B, 288 .num_regs = 4, 289 .ledctrl_base = 51, 290 }; 291 292 static const struct mc13xxx_led_devtype mc34708_led_devtype = { 293 .led_min = MC34708_LED_R, 294 .led_max = MC34708_LED_G, 295 .num_regs = 1, 296 .ledctrl_base = 54, 297 }; 298 299 static const struct platform_device_id mc13xxx_led_id_table[] = { 300 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, }, 301 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, }, 302 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, }, 303 { } 304 }; 305 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table); 306 307 static struct platform_driver mc13xxx_led_driver = { 308 .driver = { 309 .name = "mc13xxx-led", 310 }, 311 .remove = mc13xxx_led_remove, 312 .id_table = mc13xxx_led_id_table, 313 }; 314 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe); 315 316 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC"); 317 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>"); 318 MODULE_LICENSE("GPL"); 319