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- /*
- * LEDs driver for Freescale MC13783/MC13892/MC34708
- *
- * Copyright (C) 2010 Philippe Rétornaz
- *
- * Based on leds-da903x:
- * Copyright (C) 2008 Compulab, Ltd.
- * Mike Rapoport <mike@compulab.co.il>
- *
- * Copyright (C) 2006-2008 Marvell International Ltd.
- * Eric Miao <eric.miao@marvell.com>
- *
- * 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 <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/platform_device.h>
- #include <linux/leds.h>
- #include <linux/of.h>
- #include <linux/workqueue.h>
- #include <linux/mfd/mc13xxx.h>
- 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 <philippe.retornaz@epfl.ch>");
- MODULE_LICENSE("GPL");
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