1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * LEDs driver for Freescale MC13783/MC13892/MC34708 4 * 5 * Copyright (C) 2010 Philippe Rétornaz 6 * 7 * Based on leds-da903x: 8 * Copyright (C) 2008 Compulab, Ltd. 9 * Mike Rapoport <mike@compulab.co.il> 10 * 11 * Copyright (C) 2006-2008 Marvell International Ltd. 12 * Eric Miao <eric.miao@marvell.com> 13 */ 14 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/platform_device.h> 18 #include <linux/leds.h> 19 #include <linux/of.h> 20 #include <linux/mfd/mc13xxx.h> 21 22 struct mc13xxx_led_devtype { 23 int led_min; 24 int led_max; 25 int num_regs; 26 u32 ledctrl_base; 27 }; 28 29 struct mc13xxx_led { 30 struct led_classdev cdev; 31 int id; 32 struct mc13xxx_leds *leds; 33 }; 34 35 struct mc13xxx_leds { 36 struct mc13xxx *master; 37 struct mc13xxx_led_devtype *devtype; 38 int num_leds; 39 struct mc13xxx_led *led; 40 }; 41 42 static unsigned int mc13xxx_max_brightness(int id) 43 { 44 if (id >= MC13783_LED_MD && id <= MC13783_LED_KP) 45 return 0x0f; 46 else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3) 47 return 0x1f; 48 49 return 0x3f; 50 } 51 52 static int mc13xxx_led_set(struct led_classdev *led_cdev, 53 enum led_brightness value) 54 { 55 struct mc13xxx_led *led = 56 container_of(led_cdev, struct mc13xxx_led, cdev); 57 struct mc13xxx_leds *leds = led->leds; 58 unsigned int reg, bank, off, shift; 59 60 switch (led->id) { 61 case MC13783_LED_MD: 62 case MC13783_LED_AD: 63 case MC13783_LED_KP: 64 reg = 2; 65 shift = 9 + (led->id - MC13783_LED_MD) * 4; 66 break; 67 case MC13783_LED_R1: 68 case MC13783_LED_G1: 69 case MC13783_LED_B1: 70 case MC13783_LED_R2: 71 case MC13783_LED_G2: 72 case MC13783_LED_B2: 73 case MC13783_LED_R3: 74 case MC13783_LED_G3: 75 case MC13783_LED_B3: 76 off = led->id - MC13783_LED_R1; 77 bank = off / 3; 78 reg = 3 + bank; 79 shift = (off - bank * 3) * 5 + 6; 80 break; 81 case MC13892_LED_MD: 82 case MC13892_LED_AD: 83 case MC13892_LED_KP: 84 off = led->id - MC13892_LED_MD; 85 reg = off / 2; 86 shift = 3 + (off - reg * 2) * 12; 87 break; 88 case MC13892_LED_R: 89 case MC13892_LED_G: 90 case MC13892_LED_B: 91 off = led->id - MC13892_LED_R; 92 bank = off / 2; 93 reg = 2 + bank; 94 shift = (off - bank * 2) * 12 + 3; 95 break; 96 case MC34708_LED_R: 97 case MC34708_LED_G: 98 reg = 0; 99 shift = 3 + (led->id - MC34708_LED_R) * 12; 100 break; 101 default: 102 BUG(); 103 } 104 105 return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg, 106 mc13xxx_max_brightness(led->id) << shift, 107 value << shift); 108 } 109 110 #ifdef CONFIG_OF 111 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( 112 struct platform_device *pdev) 113 { 114 struct mc13xxx_leds *leds = platform_get_drvdata(pdev); 115 struct mc13xxx_leds_platform_data *pdata; 116 struct device_node *parent, *child; 117 struct device *dev = &pdev->dev; 118 int i = 0, ret = -ENODATA; 119 120 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 121 if (!pdata) 122 return ERR_PTR(-ENOMEM); 123 124 parent = of_get_child_by_name(dev->parent->of_node, "leds"); 125 if (!parent) 126 goto out_node_put; 127 128 ret = of_property_read_u32_array(parent, "led-control", 129 pdata->led_control, 130 leds->devtype->num_regs); 131 if (ret) 132 goto out_node_put; 133 134 pdata->num_leds = of_get_child_count(parent); 135 136 pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led), 137 GFP_KERNEL); 138 if (!pdata->led) { 139 ret = -ENOMEM; 140 goto out_node_put; 141 } 142 143 for_each_child_of_node(parent, child) { 144 const char *str; 145 u32 tmp; 146 147 if (of_property_read_u32(child, "reg", &tmp)) 148 continue; 149 pdata->led[i].id = leds->devtype->led_min + tmp; 150 151 if (!of_property_read_string(child, "label", &str)) 152 pdata->led[i].name = str; 153 if (!of_property_read_string(child, "linux,default-trigger", 154 &str)) 155 pdata->led[i].default_trigger = str; 156 157 i++; 158 } 159 160 pdata->num_leds = i; 161 ret = i > 0 ? 0 : -ENODATA; 162 163 out_node_put: 164 of_node_put(parent); 165 166 return ret ? ERR_PTR(ret) : pdata; 167 } 168 #else 169 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( 170 struct platform_device *pdev) 171 { 172 return ERR_PTR(-ENOSYS); 173 } 174 #endif 175 176 static int __init mc13xxx_led_probe(struct platform_device *pdev) 177 { 178 struct device *dev = &pdev->dev; 179 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev); 180 struct mc13xxx *mcdev = dev_get_drvdata(dev->parent); 181 struct mc13xxx_led_devtype *devtype = 182 (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data; 183 struct mc13xxx_leds *leds; 184 int i, id, ret = -ENODATA; 185 u32 init_led = 0; 186 187 leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL); 188 if (!leds) 189 return -ENOMEM; 190 191 leds->devtype = devtype; 192 leds->master = mcdev; 193 platform_set_drvdata(pdev, leds); 194 195 if (dev->parent->of_node) { 196 pdata = mc13xxx_led_probe_dt(pdev); 197 if (IS_ERR(pdata)) 198 return PTR_ERR(pdata); 199 } else if (!pdata) 200 return -ENODATA; 201 202 leds->num_leds = pdata->num_leds; 203 204 if ((leds->num_leds < 1) || 205 (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) { 206 dev_err(dev, "Invalid LED count %d\n", leds->num_leds); 207 return -EINVAL; 208 } 209 210 leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led), 211 GFP_KERNEL); 212 if (!leds->led) 213 return -ENOMEM; 214 215 for (i = 0; i < devtype->num_regs; i++) { 216 ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i, 217 pdata->led_control[i]); 218 if (ret) 219 return ret; 220 } 221 222 for (i = 0; i < leds->num_leds; i++) { 223 const char *name, *trig; 224 225 ret = -EINVAL; 226 227 id = pdata->led[i].id; 228 name = pdata->led[i].name; 229 trig = pdata->led[i].default_trigger; 230 231 if ((id > devtype->led_max) || (id < devtype->led_min)) { 232 dev_err(dev, "Invalid ID %i\n", id); 233 break; 234 } 235 236 if (init_led & (1 << id)) { 237 dev_warn(dev, "LED %i already initialized\n", id); 238 break; 239 } 240 241 init_led |= 1 << id; 242 leds->led[i].id = id; 243 leds->led[i].leds = leds; 244 leds->led[i].cdev.name = name; 245 leds->led[i].cdev.default_trigger = trig; 246 leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME; 247 leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set; 248 leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id); 249 250 ret = led_classdev_register(dev->parent, &leds->led[i].cdev); 251 if (ret) { 252 dev_err(dev, "Failed to register LED %i\n", id); 253 break; 254 } 255 } 256 257 if (ret) 258 while (--i >= 0) 259 led_classdev_unregister(&leds->led[i].cdev); 260 261 return ret; 262 } 263 264 static int mc13xxx_led_remove(struct platform_device *pdev) 265 { 266 struct mc13xxx_leds *leds = platform_get_drvdata(pdev); 267 int i; 268 269 for (i = 0; i < leds->num_leds; i++) 270 led_classdev_unregister(&leds->led[i].cdev); 271 272 return 0; 273 } 274 275 static const struct mc13xxx_led_devtype mc13783_led_devtype = { 276 .led_min = MC13783_LED_MD, 277 .led_max = MC13783_LED_B3, 278 .num_regs = 6, 279 .ledctrl_base = 51, 280 }; 281 282 static const struct mc13xxx_led_devtype mc13892_led_devtype = { 283 .led_min = MC13892_LED_MD, 284 .led_max = MC13892_LED_B, 285 .num_regs = 4, 286 .ledctrl_base = 51, 287 }; 288 289 static const struct mc13xxx_led_devtype mc34708_led_devtype = { 290 .led_min = MC34708_LED_R, 291 .led_max = MC34708_LED_G, 292 .num_regs = 1, 293 .ledctrl_base = 54, 294 }; 295 296 static const struct platform_device_id mc13xxx_led_id_table[] = { 297 { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, }, 298 { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, }, 299 { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, }, 300 { } 301 }; 302 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table); 303 304 static struct platform_driver mc13xxx_led_driver = { 305 .driver = { 306 .name = "mc13xxx-led", 307 }, 308 .remove = mc13xxx_led_remove, 309 .id_table = mc13xxx_led_id_table, 310 }; 311 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe); 312 313 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC"); 314 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>"); 315 MODULE_LICENSE("GPL"); 316