316 lines
7.4 KiB
C
316 lines
7.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* LEDs driver for Freescale MC13783/MC13892/MC34708
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*
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* Copyright (C) 2010 Philippe Rétornaz
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*
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* Based on leds-da903x:
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* Copyright (C) 2008 Compulab, Ltd.
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* Mike Rapoport <mike@compulab.co.il>
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*
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* Copyright (C) 2006-2008 Marvell International Ltd.
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* Eric Miao <eric.miao@marvell.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/of.h>
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#include <linux/mfd/mc13xxx.h>
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struct mc13xxx_led_devtype {
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int led_min;
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int led_max;
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int num_regs;
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u32 ledctrl_base;
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};
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struct mc13xxx_led {
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struct led_classdev cdev;
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int id;
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struct mc13xxx_leds *leds;
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};
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struct mc13xxx_leds {
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struct mc13xxx *master;
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struct mc13xxx_led_devtype *devtype;
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int num_leds;
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struct mc13xxx_led *led;
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};
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static unsigned int mc13xxx_max_brightness(int id)
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{
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if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
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return 0x0f;
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else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
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return 0x1f;
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return 0x3f;
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}
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static int mc13xxx_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct mc13xxx_led *led =
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container_of(led_cdev, struct mc13xxx_led, cdev);
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struct mc13xxx_leds *leds = led->leds;
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unsigned int reg, bank, off, shift;
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switch (led->id) {
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case MC13783_LED_MD:
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case MC13783_LED_AD:
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case MC13783_LED_KP:
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reg = 2;
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shift = 9 + (led->id - MC13783_LED_MD) * 4;
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break;
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case MC13783_LED_R1:
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case MC13783_LED_G1:
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case MC13783_LED_B1:
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case MC13783_LED_R2:
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case MC13783_LED_G2:
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case MC13783_LED_B2:
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case MC13783_LED_R3:
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case MC13783_LED_G3:
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case MC13783_LED_B3:
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off = led->id - MC13783_LED_R1;
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bank = off / 3;
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reg = 3 + bank;
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shift = (off - bank * 3) * 5 + 6;
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break;
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case MC13892_LED_MD:
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case MC13892_LED_AD:
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case MC13892_LED_KP:
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off = led->id - MC13892_LED_MD;
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reg = off / 2;
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shift = 3 + (off - reg * 2) * 12;
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break;
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case MC13892_LED_R:
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case MC13892_LED_G:
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case MC13892_LED_B:
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off = led->id - MC13892_LED_R;
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bank = off / 2;
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reg = 2 + bank;
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shift = (off - bank * 2) * 12 + 3;
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break;
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case MC34708_LED_R:
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case MC34708_LED_G:
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reg = 0;
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shift = 3 + (led->id - MC34708_LED_R) * 12;
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break;
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default:
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BUG();
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}
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return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
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mc13xxx_max_brightness(led->id) << shift,
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value << shift);
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}
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#ifdef CONFIG_OF
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static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
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struct platform_device *pdev)
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{
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struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
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struct mc13xxx_leds_platform_data *pdata;
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struct device_node *parent, *child;
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struct device *dev = &pdev->dev;
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int i = 0, ret = -ENODATA;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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parent = of_get_child_by_name(dev_of_node(dev->parent), "leds");
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if (!parent)
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goto out_node_put;
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ret = of_property_read_u32_array(parent, "led-control",
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pdata->led_control,
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leds->devtype->num_regs);
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if (ret)
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goto out_node_put;
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pdata->num_leds = of_get_available_child_count(parent);
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pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
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GFP_KERNEL);
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if (!pdata->led) {
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ret = -ENOMEM;
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goto out_node_put;
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}
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for_each_available_child_of_node(parent, child) {
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const char *str;
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u32 tmp;
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if (of_property_read_u32(child, "reg", &tmp))
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continue;
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pdata->led[i].id = leds->devtype->led_min + tmp;
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if (!of_property_read_string(child, "label", &str))
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pdata->led[i].name = str;
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if (!of_property_read_string(child, "linux,default-trigger",
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&str))
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pdata->led[i].default_trigger = str;
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i++;
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}
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pdata->num_leds = i;
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ret = i > 0 ? 0 : -ENODATA;
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out_node_put:
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of_node_put(parent);
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return ret ? ERR_PTR(ret) : pdata;
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}
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#else
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static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
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struct platform_device *pdev)
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{
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return ERR_PTR(-ENOSYS);
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}
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#endif
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static int __init mc13xxx_led_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
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struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
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struct mc13xxx_led_devtype *devtype =
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(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
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struct mc13xxx_leds *leds;
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int i, id, ret = -ENODATA;
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u32 init_led = 0;
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leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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leds->devtype = devtype;
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leds->master = mcdev;
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platform_set_drvdata(pdev, leds);
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if (dev_of_node(dev->parent)) {
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pdata = mc13xxx_led_probe_dt(pdev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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} else if (!pdata)
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return -ENODATA;
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leds->num_leds = pdata->num_leds;
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if ((leds->num_leds < 1) ||
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(leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
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dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
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return -EINVAL;
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}
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leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led),
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GFP_KERNEL);
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if (!leds->led)
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return -ENOMEM;
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for (i = 0; i < devtype->num_regs; i++) {
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ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
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pdata->led_control[i]);
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if (ret)
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return ret;
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}
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for (i = 0; i < leds->num_leds; i++) {
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const char *name, *trig;
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ret = -EINVAL;
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id = pdata->led[i].id;
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name = pdata->led[i].name;
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trig = pdata->led[i].default_trigger;
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if ((id > devtype->led_max) || (id < devtype->led_min)) {
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dev_err(dev, "Invalid ID %i\n", id);
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break;
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}
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if (init_led & (1 << id)) {
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dev_warn(dev, "LED %i already initialized\n", id);
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break;
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}
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init_led |= 1 << id;
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leds->led[i].id = id;
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leds->led[i].leds = leds;
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leds->led[i].cdev.name = name;
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leds->led[i].cdev.default_trigger = trig;
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leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
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leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
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leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
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ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
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if (ret) {
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dev_err(dev, "Failed to register LED %i\n", id);
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break;
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}
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}
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if (ret)
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while (--i >= 0)
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led_classdev_unregister(&leds->led[i].cdev);
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return ret;
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}
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static int mc13xxx_led_remove(struct platform_device *pdev)
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{
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struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < leds->num_leds; i++)
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led_classdev_unregister(&leds->led[i].cdev);
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return 0;
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}
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static const struct mc13xxx_led_devtype mc13783_led_devtype = {
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.led_min = MC13783_LED_MD,
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.led_max = MC13783_LED_B3,
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.num_regs = 6,
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.ledctrl_base = 51,
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};
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static const struct mc13xxx_led_devtype mc13892_led_devtype = {
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.led_min = MC13892_LED_MD,
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.led_max = MC13892_LED_B,
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.num_regs = 4,
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.ledctrl_base = 51,
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};
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static const struct mc13xxx_led_devtype mc34708_led_devtype = {
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.led_min = MC34708_LED_R,
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.led_max = MC34708_LED_G,
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.num_regs = 1,
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.ledctrl_base = 54,
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};
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static const struct platform_device_id mc13xxx_led_id_table[] = {
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{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
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{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
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{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
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static struct platform_driver mc13xxx_led_driver = {
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.driver = {
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.name = "mc13xxx-led",
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},
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.remove = mc13xxx_led_remove,
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.id_table = mc13xxx_led_id_table,
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};
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module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
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MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
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MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
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MODULE_LICENSE("GPL");
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