cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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leds-mc13783.c (7540B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * LEDs driver for Freescale MC13783/MC13892/MC34708
      4 *
      5 * Copyright (C) 2010 Philippe Rétornaz
      6 *
      7 * Based on leds-da903x:
      8 * Copyright (C) 2008 Compulab, Ltd.
      9 *      Mike Rapoport <mike@compulab.co.il>
     10 *
     11 * Copyright (C) 2006-2008 Marvell International Ltd.
     12 *      Eric Miao <eric.miao@marvell.com>
     13 */
     14
     15#include <linux/module.h>
     16#include <linux/kernel.h>
     17#include <linux/platform_device.h>
     18#include <linux/leds.h>
     19#include <linux/of.h>
     20#include <linux/mfd/mc13xxx.h>
     21
     22struct mc13xxx_led_devtype {
     23	int	led_min;
     24	int	led_max;
     25	int	num_regs;
     26	u32	ledctrl_base;
     27};
     28
     29struct mc13xxx_led {
     30	struct led_classdev	cdev;
     31	int			id;
     32	struct mc13xxx_leds	*leds;
     33};
     34
     35struct mc13xxx_leds {
     36	struct mc13xxx			*master;
     37	struct mc13xxx_led_devtype	*devtype;
     38	int				num_leds;
     39	struct mc13xxx_led		*led;
     40};
     41
     42static unsigned int mc13xxx_max_brightness(int id)
     43{
     44	if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
     45		return 0x0f;
     46	else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
     47		return 0x1f;
     48
     49	return 0x3f;
     50}
     51
     52static int mc13xxx_led_set(struct led_classdev *led_cdev,
     53			    enum led_brightness value)
     54{
     55	struct mc13xxx_led *led =
     56		container_of(led_cdev, struct mc13xxx_led, cdev);
     57	struct mc13xxx_leds *leds = led->leds;
     58	unsigned int reg, bank, off, shift;
     59
     60	switch (led->id) {
     61	case MC13783_LED_MD:
     62	case MC13783_LED_AD:
     63	case MC13783_LED_KP:
     64		reg = 2;
     65		shift = 9 + (led->id - MC13783_LED_MD) * 4;
     66		break;
     67	case MC13783_LED_R1:
     68	case MC13783_LED_G1:
     69	case MC13783_LED_B1:
     70	case MC13783_LED_R2:
     71	case MC13783_LED_G2:
     72	case MC13783_LED_B2:
     73	case MC13783_LED_R3:
     74	case MC13783_LED_G3:
     75	case MC13783_LED_B3:
     76		off = led->id - MC13783_LED_R1;
     77		bank = off / 3;
     78		reg = 3 + bank;
     79		shift = (off - bank * 3) * 5 + 6;
     80		break;
     81	case MC13892_LED_MD:
     82	case MC13892_LED_AD:
     83	case MC13892_LED_KP:
     84		off = led->id - MC13892_LED_MD;
     85		reg = off / 2;
     86		shift = 3 + (off - reg * 2) * 12;
     87		break;
     88	case MC13892_LED_R:
     89	case MC13892_LED_G:
     90	case MC13892_LED_B:
     91		off = led->id - MC13892_LED_R;
     92		bank = off / 2;
     93		reg = 2 + bank;
     94		shift = (off - bank * 2) * 12 + 3;
     95		break;
     96	case MC34708_LED_R:
     97	case MC34708_LED_G:
     98		reg = 0;
     99		shift = 3 + (led->id - MC34708_LED_R) * 12;
    100		break;
    101	default:
    102		BUG();
    103	}
    104
    105	return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
    106			mc13xxx_max_brightness(led->id) << shift,
    107			value << shift);
    108}
    109
    110#ifdef CONFIG_OF
    111static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
    112	struct platform_device *pdev)
    113{
    114	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
    115	struct mc13xxx_leds_platform_data *pdata;
    116	struct device_node *parent, *child;
    117	struct device *dev = &pdev->dev;
    118	int i = 0, ret = -ENODATA;
    119
    120	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
    121	if (!pdata)
    122		return ERR_PTR(-ENOMEM);
    123
    124	parent = of_get_child_by_name(dev_of_node(dev->parent), "leds");
    125	if (!parent)
    126		goto out_node_put;
    127
    128	ret = of_property_read_u32_array(parent, "led-control",
    129					 pdata->led_control,
    130					 leds->devtype->num_regs);
    131	if (ret)
    132		goto out_node_put;
    133
    134	pdata->num_leds = of_get_available_child_count(parent);
    135
    136	pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
    137				  GFP_KERNEL);
    138	if (!pdata->led) {
    139		ret = -ENOMEM;
    140		goto out_node_put;
    141	}
    142
    143	for_each_available_child_of_node(parent, child) {
    144		const char *str;
    145		u32 tmp;
    146
    147		if (of_property_read_u32(child, "reg", &tmp))
    148			continue;
    149		pdata->led[i].id = leds->devtype->led_min + tmp;
    150
    151		if (!of_property_read_string(child, "label", &str))
    152			pdata->led[i].name = str;
    153		if (!of_property_read_string(child, "linux,default-trigger",
    154					     &str))
    155			pdata->led[i].default_trigger = str;
    156
    157		i++;
    158	}
    159
    160	pdata->num_leds = i;
    161	ret = i > 0 ? 0 : -ENODATA;
    162
    163out_node_put:
    164	of_node_put(parent);
    165
    166	return ret ? ERR_PTR(ret) : pdata;
    167}
    168#else
    169static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
    170	struct platform_device *pdev)
    171{
    172	return ERR_PTR(-ENOSYS);
    173}
    174#endif
    175
    176static int __init mc13xxx_led_probe(struct platform_device *pdev)
    177{
    178	struct device *dev = &pdev->dev;
    179	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
    180	struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
    181	struct mc13xxx_led_devtype *devtype =
    182		(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
    183	struct mc13xxx_leds *leds;
    184	int i, id, ret = -ENODATA;
    185	u32 init_led = 0;
    186
    187	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
    188	if (!leds)
    189		return -ENOMEM;
    190
    191	leds->devtype = devtype;
    192	leds->master = mcdev;
    193	platform_set_drvdata(pdev, leds);
    194
    195	if (dev_of_node(dev->parent)) {
    196		pdata = mc13xxx_led_probe_dt(pdev);
    197		if (IS_ERR(pdata))
    198			return PTR_ERR(pdata);
    199	} else if (!pdata)
    200		return -ENODATA;
    201
    202	leds->num_leds = pdata->num_leds;
    203
    204	if ((leds->num_leds < 1) ||
    205	    (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
    206		dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
    207		return -EINVAL;
    208	}
    209
    210	leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led),
    211				 GFP_KERNEL);
    212	if (!leds->led)
    213		return -ENOMEM;
    214
    215	for (i = 0; i < devtype->num_regs; i++) {
    216		ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
    217					pdata->led_control[i]);
    218		if (ret)
    219			return ret;
    220	}
    221
    222	for (i = 0; i < leds->num_leds; i++) {
    223		const char *name, *trig;
    224
    225		ret = -EINVAL;
    226
    227		id = pdata->led[i].id;
    228		name = pdata->led[i].name;
    229		trig = pdata->led[i].default_trigger;
    230
    231		if ((id > devtype->led_max) || (id < devtype->led_min)) {
    232			dev_err(dev, "Invalid ID %i\n", id);
    233			break;
    234		}
    235
    236		if (init_led & (1 << id)) {
    237			dev_warn(dev, "LED %i already initialized\n", id);
    238			break;
    239		}
    240
    241		init_led |= 1 << id;
    242		leds->led[i].id = id;
    243		leds->led[i].leds = leds;
    244		leds->led[i].cdev.name = name;
    245		leds->led[i].cdev.default_trigger = trig;
    246		leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
    247		leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
    248		leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
    249
    250		ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
    251		if (ret) {
    252			dev_err(dev, "Failed to register LED %i\n", id);
    253			break;
    254		}
    255	}
    256
    257	if (ret)
    258		while (--i >= 0)
    259			led_classdev_unregister(&leds->led[i].cdev);
    260
    261	return ret;
    262}
    263
    264static int mc13xxx_led_remove(struct platform_device *pdev)
    265{
    266	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
    267	int i;
    268
    269	for (i = 0; i < leds->num_leds; i++)
    270		led_classdev_unregister(&leds->led[i].cdev);
    271
    272	return 0;
    273}
    274
    275static const struct mc13xxx_led_devtype mc13783_led_devtype = {
    276	.led_min	= MC13783_LED_MD,
    277	.led_max	= MC13783_LED_B3,
    278	.num_regs	= 6,
    279	.ledctrl_base	= 51,
    280};
    281
    282static const struct mc13xxx_led_devtype mc13892_led_devtype = {
    283	.led_min	= MC13892_LED_MD,
    284	.led_max	= MC13892_LED_B,
    285	.num_regs	= 4,
    286	.ledctrl_base	= 51,
    287};
    288
    289static const struct mc13xxx_led_devtype mc34708_led_devtype = {
    290	.led_min	= MC34708_LED_R,
    291	.led_max	= MC34708_LED_G,
    292	.num_regs	= 1,
    293	.ledctrl_base	= 54,
    294};
    295
    296static const struct platform_device_id mc13xxx_led_id_table[] = {
    297	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
    298	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
    299	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
    300	{ }
    301};
    302MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
    303
    304static struct platform_driver mc13xxx_led_driver = {
    305	.driver	= {
    306		.name	= "mc13xxx-led",
    307	},
    308	.remove		= mc13xxx_led_remove,
    309	.id_table	= mc13xxx_led_id_table,
    310};
    311module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
    312
    313MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
    314MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
    315MODULE_LICENSE("GPL");