269 lines
6.4 KiB
C
269 lines
6.4 KiB
C
/*
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* LEDs driver for Freescale MC13783/MC13892
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/init.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/mc13xxx.h>
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#define MC13XXX_REG_LED_CONTROL(x) (51 + (x))
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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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};
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struct mc13xxx_led {
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struct led_classdev cdev;
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struct work_struct work;
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struct mc13xxx *master;
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enum led_brightness new_brightness;
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int id;
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};
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struct mc13xxx_leds {
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struct mc13xxx_led_devtype *devtype;
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int num_leds;
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struct mc13xxx_led led[0];
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};
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static void mc13xxx_led_work(struct work_struct *work)
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{
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struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
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int reg, mask, value, bank, off, shift;
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switch (led->id) {
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case MC13783_LED_MD:
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reg = MC13XXX_REG_LED_CONTROL(2);
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shift = 9;
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mask = 0x0f;
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value = led->new_brightness >> 4;
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break;
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case MC13783_LED_AD:
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reg = MC13XXX_REG_LED_CONTROL(2);
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shift = 13;
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mask = 0x0f;
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value = led->new_brightness >> 4;
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break;
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case MC13783_LED_KP:
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reg = MC13XXX_REG_LED_CONTROL(2);
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shift = 17;
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mask = 0x0f;
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value = led->new_brightness >> 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 = MC13XXX_REG_LED_CONTROL(3) + bank;
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shift = (off - bank * 3) * 5 + 6;
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value = led->new_brightness >> 3;
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mask = 0x1f;
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break;
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case MC13892_LED_MD:
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reg = MC13XXX_REG_LED_CONTROL(0);
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shift = 3;
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mask = 0x3f;
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value = led->new_brightness >> 2;
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break;
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case MC13892_LED_AD:
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reg = MC13XXX_REG_LED_CONTROL(0);
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shift = 15;
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mask = 0x3f;
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value = led->new_brightness >> 2;
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break;
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case MC13892_LED_KP:
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reg = MC13XXX_REG_LED_CONTROL(1);
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shift = 3;
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mask = 0x3f;
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value = led->new_brightness >> 2;
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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 = MC13XXX_REG_LED_CONTROL(2) + bank;
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shift = (off - bank * 2) * 12 + 3;
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value = led->new_brightness >> 2;
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mask = 0x3f;
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break;
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default:
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BUG();
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}
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mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
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}
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static void 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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led->new_brightness = value;
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schedule_work(&led->work);
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}
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static int __init mc13xxx_led_probe(struct platform_device *pdev)
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{
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struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct mc13xxx *mcdev = dev_get_drvdata(pdev->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, num_leds, ret = -ENODATA;
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u32 reg, init_led = 0;
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if (!pdata) {
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dev_err(&pdev->dev, "Missing platform data\n");
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return -ENODEV;
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}
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num_leds = pdata->num_leds;
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if ((num_leds < 1) ||
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(num_leds > (devtype->led_max - devtype->led_min + 1))) {
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dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
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return -EINVAL;
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}
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leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
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sizeof(struct mc13xxx_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->num_leds = num_leds;
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platform_set_drvdata(pdev, leds);
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for (i = 0; i < devtype->num_regs; i++) {
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reg = pdata->led_control[i];
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WARN_ON(reg >= (1 << 24));
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ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
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if (ret)
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return ret;
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}
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for (i = 0; i < 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(&pdev->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(&pdev->dev,
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"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].master = mcdev;
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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.brightness_set = mc13xxx_led_set;
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leds->led[i].cdev.brightness = LED_OFF;
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INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
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ret = led_classdev_register(pdev->dev.parent,
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&leds->led[i].cdev);
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if (ret) {
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dev_err(&pdev->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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cancel_work_sync(&leds->led[i].work);
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}
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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 *mcdev = dev_get_drvdata(pdev->dev.parent);
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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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cancel_work_sync(&leds->led[i].work);
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}
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for (i = 0; i < leds->devtype->num_regs; i++)
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mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
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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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};
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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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};
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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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{ }
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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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.owner = THIS_MODULE,
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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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