/* * LEDs driver for Freescale MC13783/MC13892/MC34708 * * Copyright (C) 2010 Philippe Rétornaz * * Based on leds-da903x: * Copyright (C) 2008 Compulab, Ltd. * Mike Rapoport * * Copyright (C) 2006-2008 Marvell International Ltd. * Eric Miao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include struct mc13xxx_led_devtype { int led_min; int led_max; int num_regs; u32 ledctrl_base; }; struct mc13xxx_led { struct led_classdev cdev; struct work_struct work; enum led_brightness new_brightness; int id; struct mc13xxx_leds *leds; }; struct mc13xxx_leds { struct mc13xxx *master; struct mc13xxx_led_devtype *devtype; int num_leds; struct mc13xxx_led led[0]; }; static unsigned int mc13xxx_max_brightness(int id) { if (id >= MC13783_LED_MD && id <= MC13783_LED_KP) return 0x0f; else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3) return 0x1f; return 0x3f; } static void mc13xxx_led_work(struct work_struct *work) { struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work); struct mc13xxx_leds *leds = led->leds; unsigned int reg, bank, off, shift; switch (led->id) { case MC13783_LED_MD: case MC13783_LED_AD: case MC13783_LED_KP: reg = 2; shift = 9 + (led->id - MC13783_LED_MD) * 4; break; case MC13783_LED_R1: case MC13783_LED_G1: case MC13783_LED_B1: case MC13783_LED_R2: case MC13783_LED_G2: case MC13783_LED_B2: case MC13783_LED_R3: case MC13783_LED_G3: case MC13783_LED_B3: off = led->id - MC13783_LED_R1; bank = off / 3; reg = 3 + bank; shift = (off - bank * 3) * 5 + 6; break; case MC13892_LED_MD: case MC13892_LED_AD: case MC13892_LED_KP: reg = (led->id - MC13892_LED_MD) / 2; shift = 3 + (led->id - MC13892_LED_MD) * 12; break; case MC13892_LED_R: case MC13892_LED_G: case MC13892_LED_B: off = led->id - MC13892_LED_R; bank = off / 2; reg = 2 + bank; shift = (off - bank * 2) * 12 + 3; break; case MC34708_LED_R: case MC34708_LED_G: reg = 0; shift = 3 + (led->id - MC34708_LED_R) * 12; break; default: BUG(); } mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg, mc13xxx_max_brightness(led->id) << shift, led->new_brightness << shift); } static void mc13xxx_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct mc13xxx_led *led = container_of(led_cdev, struct mc13xxx_led, cdev); led->new_brightness = value; schedule_work(&led->work); } static int __init mc13xxx_led_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev); struct mc13xxx *mcdev = dev_get_drvdata(dev->parent); struct mc13xxx_led_devtype *devtype = (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data; struct mc13xxx_leds *leds; int i, id, num_leds, ret = -ENODATA; u32 init_led = 0; if (!pdata) { dev_err(dev, "Missing platform data\n"); return -ENODEV; } num_leds = pdata->num_leds; if ((num_leds < 1) || (num_leds > (devtype->led_max - devtype->led_min + 1))) { dev_err(dev, "Invalid LED count %d\n", num_leds); return -EINVAL; } leds = devm_kzalloc(dev, num_leds * sizeof(struct mc13xxx_led) + sizeof(struct mc13xxx_leds), GFP_KERNEL); if (!leds) return -ENOMEM; leds->devtype = devtype; leds->num_leds = num_leds; leds->master = mcdev; platform_set_drvdata(pdev, leds); for (i = 0; i < devtype->num_regs; i++) { ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i, pdata->led_control[i]); if (ret) return ret; } for (i = 0; i < num_leds; i++) { const char *name, *trig; ret = -EINVAL; id = pdata->led[i].id; name = pdata->led[i].name; trig = pdata->led[i].default_trigger; if ((id > devtype->led_max) || (id < devtype->led_min)) { dev_err(dev, "Invalid ID %i\n", id); break; } if (init_led & (1 << id)) { dev_warn(dev, "LED %i already initialized\n", id); break; } init_led |= 1 << id; leds->led[i].id = id; leds->led[i].leds = leds; leds->led[i].cdev.name = name; leds->led[i].cdev.default_trigger = trig; leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME; leds->led[i].cdev.brightness_set = mc13xxx_led_set; leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id); INIT_WORK(&leds->led[i].work, mc13xxx_led_work); ret = led_classdev_register(dev->parent, &leds->led[i].cdev); if (ret) { dev_err(dev, "Failed to register LED %i\n", id); break; } } if (ret) while (--i >= 0) { led_classdev_unregister(&leds->led[i].cdev); cancel_work_sync(&leds->led[i].work); } return ret; } static int mc13xxx_led_remove(struct platform_device *pdev) { struct mc13xxx_leds *leds = platform_get_drvdata(pdev); int i; for (i = 0; i < leds->num_leds; i++) { led_classdev_unregister(&leds->led[i].cdev); cancel_work_sync(&leds->led[i].work); } return 0; } static const struct mc13xxx_led_devtype mc13783_led_devtype = { .led_min = MC13783_LED_MD, .led_max = MC13783_LED_B3, .num_regs = 6, .ledctrl_base = 51, }; static const struct mc13xxx_led_devtype mc13892_led_devtype = { .led_min = MC13892_LED_MD, .led_max = MC13892_LED_B, .num_regs = 4, .ledctrl_base = 51, }; static const struct mc13xxx_led_devtype mc34708_led_devtype = { .led_min = MC34708_LED_R, .led_max = MC34708_LED_G, .num_regs = 1, .ledctrl_base = 54, }; static const struct platform_device_id mc13xxx_led_id_table[] = { { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, }, { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, }, { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, }, { } }; MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table); static struct platform_driver mc13xxx_led_driver = { .driver = { .name = "mc13xxx-led", .owner = THIS_MODULE, }, .remove = mc13xxx_led_remove, .id_table = mc13xxx_led_id_table, }; module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe); MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC"); MODULE_AUTHOR("Philippe Retornaz "); MODULE_LICENSE("GPL");