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