From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/leds/leds-mc13783.c | 334 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 334 insertions(+) create mode 100644 drivers/leds/leds-mc13783.c (limited to 'drivers/leds/leds-mc13783.c') diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c new file mode 100644 index 000000000..e2b847fe2 --- /dev/null +++ b/drivers/leds/leds-mc13783.c @@ -0,0 +1,334 @@ +/* + * 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; +}; + +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); +} + +#ifdef CONFIG_OF +static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( + struct platform_device *pdev) +{ + struct mc13xxx_leds *leds = platform_get_drvdata(pdev); + struct mc13xxx_leds_platform_data *pdata; + struct device_node *parent, *child; + struct device *dev = &pdev->dev; + int i = 0, ret = -ENODATA; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + parent = of_get_child_by_name(dev->parent->of_node, "leds"); + if (!parent) + goto out_node_put; + + ret = of_property_read_u32_array(parent, "led-control", + pdata->led_control, + leds->devtype->num_regs); + if (ret) + goto out_node_put; + + pdata->num_leds = of_get_child_count(parent); + + pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led), + GFP_KERNEL); + if (!pdata->led) { + ret = -ENOMEM; + goto out_node_put; + } + + for_each_child_of_node(parent, child) { + const char *str; + u32 tmp; + + if (of_property_read_u32(child, "reg", &tmp)) + continue; + pdata->led[i].id = leds->devtype->led_min + tmp; + + if (!of_property_read_string(child, "label", &str)) + pdata->led[i].name = str; + if (!of_property_read_string(child, "linux,default-trigger", + &str)) + pdata->led[i].default_trigger = str; + + i++; + } + + pdata->num_leds = i; + ret = i > 0 ? 0 : -ENODATA; + +out_node_put: + of_node_put(parent); + + return ret ? ERR_PTR(ret) : pdata; +} +#else +static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt( + struct platform_device *pdev) +{ + return ERR_PTR(-ENOSYS); +} +#endif + +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, ret = -ENODATA; + u32 init_led = 0; + + leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL); + if (!leds) + return -ENOMEM; + + leds->devtype = devtype; + leds->master = mcdev; + platform_set_drvdata(pdev, leds); + + if (dev->parent->of_node) { + pdata = mc13xxx_led_probe_dt(pdev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + } else if (!pdata) + return -ENODATA; + + leds->num_leds = pdata->num_leds; + + if ((leds->num_leds < 1) || + (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) { + dev_err(dev, "Invalid LED count %d\n", leds->num_leds); + return -EINVAL; + } + + leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led), + GFP_KERNEL); + if (!leds->led) + return -ENOMEM; + + 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 < leds->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", + }, + .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"); -- cgit v1.2.3-54-g00ecf