/* * LEDs driver for Freescale MC13783 * * 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 #define MC13XXX_REG_LED_CONTROL(x) (51 + (x)) struct mc13xxx_led_devtype { int led_min; int led_max; int num_regs; }; struct mc13xxx_led { struct led_classdev cdev; struct work_struct work; struct mc13xxx *master; enum led_brightness new_brightness; int id; }; struct mc13xxx_leds { struct mc13xxx_led_devtype *devtype; int num_leds; struct mc13xxx_led led[0]; }; static void mc13xxx_led_work(struct work_struct *work) { struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work); int reg, mask, value, bank, off, shift; switch (led->id) { case MC13783_LED_MD: reg = MC13XXX_REG_LED_CONTROL(2); shift = 9; mask = 0x0f; value = led->new_brightness >> 4; break; case MC13783_LED_AD: reg = MC13XXX_REG_LED_CONTROL(2); shift = 13; mask = 0x0f; value = led->new_brightness >> 4; break; case MC13783_LED_KP: reg = MC13XXX_REG_LED_CONTROL(2); shift = 17; mask = 0x0f; value = led->new_brightness >> 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 = MC13XXX_REG_LED_CONTROL(3) + bank; shift = (off - bank * 3) * 5 + 6; value = led->new_brightness >> 3; mask = 0x1f; break; default: BUG(); } mc13xxx_lock(led->master); mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift); mc13xxx_unlock(led->master); } 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_setup(struct mc13xxx_led *led, int max_current) { int shift, mask, reg, ret, bank; switch (led->id) { case MC13783_LED_MD: reg = MC13XXX_REG_LED_CONTROL(2); shift = 0; mask = 0x07; break; case MC13783_LED_AD: reg = MC13XXX_REG_LED_CONTROL(2); shift = 3; mask = 0x07; break; case MC13783_LED_KP: reg = MC13XXX_REG_LED_CONTROL(2); shift = 6; mask = 0x07; 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: bank = (led->id - MC13783_LED_R1) / 3; reg = MC13XXX_REG_LED_CONTROL(3) + bank; shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2; mask = 0x03; break; default: BUG(); } mc13xxx_lock(led->master); ret = mc13xxx_reg_rmw(led->master, reg, mask << shift, max_current << shift); mc13xxx_unlock(led->master); return ret; } static int __init mc13xxx_led_probe(struct platform_device *pdev) { struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); struct mc13xxx *mcdev = dev_get_drvdata(pdev->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; u32 reg, init_led = 0; if (!pdata) { dev_err(&pdev->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(&pdev->dev, "Invalid LED count %d\n", num_leds); return -EINVAL; } leds = devm_kzalloc(&pdev->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; platform_set_drvdata(pdev, leds); mc13xxx_lock(mcdev); for (i = 0; i < devtype->num_regs; i++) { reg = pdata->led_control[i]; WARN_ON(reg >= (1 << 24)); ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg); if (ret) break; } mc13xxx_unlock(mcdev); if (ret) { dev_err(&pdev->dev, "Unable to init LED driver\n"); return ret; } for (i = 0; i < num_leds; i++) { const char *name, *trig; char max_current; ret = -EINVAL; id = pdata->led[i].id; name = pdata->led[i].name; trig = pdata->led[i].default_trigger; max_current = pdata->led[i].max_current; if ((id > devtype->led_max) || (id < devtype->led_min)) { dev_err(&pdev->dev, "Invalid ID %i\n", id); break; } if (init_led & (1 << id)) { dev_warn(&pdev->dev, "LED %i already initialized\n", id); break; } init_led |= 1 << id; leds->led[i].id = id; leds->led[i].master = mcdev; leds->led[i].cdev.name = name; leds->led[i].cdev.default_trigger = trig; leds->led[i].cdev.brightness_set = mc13xxx_led_set; leds->led[i].cdev.brightness = LED_OFF; INIT_WORK(&leds->led[i].work, mc13xxx_led_work); ret = mc13xxx_led_setup(&leds->led[i], max_current); if (ret) { dev_err(&pdev->dev, "Unable to setup LED %i\n", id); break; } ret = led_classdev_register(pdev->dev.parent, &leds->led[i].cdev); if (ret) { dev_err(&pdev->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 *mcdev = dev_get_drvdata(pdev->dev.parent); 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); } mc13xxx_lock(mcdev); for (i = 0; i < leds->devtype->num_regs; i++) mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0); mc13xxx_unlock(mcdev); return 0; } static const struct mc13xxx_led_devtype mc13783_led_devtype = { .led_min = MC13783_LED_MD, .led_max = MC13783_LED_B3, .num_regs = 6, }; static const struct platform_device_id mc13xxx_led_id_table[] = { { "mc13783-led", (kernel_ulong_t)&mc13783_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");