/* * Backlight driver for Maxim MAX8925 * * Copyright (C) 2009 Marvell International Ltd. * Haojian Zhuang * * 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 #include #include #define MAX_BRIGHTNESS (0xff) #define MIN_BRIGHTNESS (0) #define LWX_FREQ(x) (((x - 601) / 100) & 0x7) struct max8925_backlight_data { struct max8925_chip *chip; int current_brightness; int reg_mode_cntl; int reg_cntl; }; static int max8925_backlight_set(struct backlight_device *bl, int brightness) { struct max8925_backlight_data *data = bl_get_data(bl); struct max8925_chip *chip = data->chip; unsigned char value; int ret; if (brightness > MAX_BRIGHTNESS) value = MAX_BRIGHTNESS; else value = brightness; ret = max8925_reg_write(chip->i2c, data->reg_cntl, value); if (ret < 0) goto out; if (!data->current_brightness && brightness) /* enable WLED output */ ret = max8925_set_bits(chip->i2c, data->reg_mode_cntl, 1, 1); else if (!brightness) /* disable WLED output */ ret = max8925_set_bits(chip->i2c, data->reg_mode_cntl, 1, 0); if (ret < 0) goto out; dev_dbg(chip->dev, "set brightness %d\n", value); data->current_brightness = value; return 0; out: dev_dbg(chip->dev, "set brightness %d failure with return value:%d\n", value, ret); return ret; } static int max8925_backlight_update_status(struct backlight_device *bl) { int brightness = bl->props.brightness; if (bl->props.power != FB_BLANK_UNBLANK) brightness = 0; if (bl->props.fb_blank != FB_BLANK_UNBLANK) brightness = 0; if (bl->props.state & BL_CORE_SUSPENDED) brightness = 0; return max8925_backlight_set(bl, brightness); } static int max8925_backlight_get_brightness(struct backlight_device *bl) { struct max8925_backlight_data *data = bl_get_data(bl); struct max8925_chip *chip = data->chip; int ret; ret = max8925_reg_read(chip->i2c, data->reg_cntl); if (ret < 0) return -EINVAL; data->current_brightness = ret; dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness); return ret; } static const struct backlight_ops max8925_backlight_ops = { .options = BL_CORE_SUSPENDRESUME, .update_status = max8925_backlight_update_status, .get_brightness = max8925_backlight_get_brightness, }; static void max8925_backlight_dt_init(struct platform_device *pdev) { struct device_node *nproot = pdev->dev.parent->of_node, *np; struct max8925_backlight_pdata *pdata; u32 val; if (!nproot || !IS_ENABLED(CONFIG_OF)) return; pdata = devm_kzalloc(&pdev->dev, sizeof(struct max8925_backlight_pdata), GFP_KERNEL); if (!pdata) return; np = of_find_node_by_name(nproot, "backlight"); if (!np) { dev_err(&pdev->dev, "failed to find backlight node\n"); return; } if (!of_property_read_u32(np, "maxim,max8925-dual-string", &val)) pdata->dual_string = val; pdev->dev.platform_data = pdata; } static int max8925_backlight_probe(struct platform_device *pdev) { struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); struct max8925_backlight_pdata *pdata; struct max8925_backlight_data *data; struct backlight_device *bl; struct backlight_properties props; struct resource *res; unsigned char value; int ret = 0; data = devm_kzalloc(&pdev->dev, sizeof(struct max8925_backlight_data), GFP_KERNEL); if (data == NULL) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_REG, 0); if (!res) { dev_err(&pdev->dev, "No REG resource for mode control!\n"); return -ENXIO; } data->reg_mode_cntl = res->start; res = platform_get_resource(pdev, IORESOURCE_REG, 1); if (!res) { dev_err(&pdev->dev, "No REG resource for control!\n"); return -ENXIO; } data->reg_cntl = res->start; data->chip = chip; data->current_brightness = 0; memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.max_brightness = MAX_BRIGHTNESS; bl = devm_backlight_device_register(&pdev->dev, "max8925-backlight", &pdev->dev, data, &max8925_backlight_ops, &props); if (IS_ERR(bl)) { dev_err(&pdev->dev, "failed to register backlight\n"); return PTR_ERR(bl); } bl->props.brightness = MAX_BRIGHTNESS; platform_set_drvdata(pdev, bl); value = 0; if (!pdev->dev.platform_data) max8925_backlight_dt_init(pdev); pdata = pdev->dev.platform_data; if (pdata) { if (pdata->lxw_scl) value |= (1 << 7); if (pdata->lxw_freq) value |= (LWX_FREQ(pdata->lxw_freq) << 4); if (pdata->dual_string) value |= (1 << 1); } ret = max8925_set_bits(chip->i2c, data->reg_mode_cntl, 0xfe, value); if (ret < 0) return ret; backlight_update_status(bl); return 0; } static struct platform_driver max8925_backlight_driver = { .driver = { .name = "max8925-backlight", }, .probe = max8925_backlight_probe, }; module_platform_driver(max8925_backlight_driver); MODULE_DESCRIPTION("Backlight Driver for Maxim MAX8925"); MODULE_AUTHOR("Haojian Zhuang "); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:max8925-backlight"); atch/net/802/Makefile?id=1372cef1c697d8aac0cc923f8aa2c37d790ec9ed'>patch) treeed5f350cd559bc15ae370f0c9fd280204e98597d /net/802/Makefile parentd00b74613fb18dfd0a5aa99270ee2e72d5c808d7 (diff)
regulator: fixed: Revert support for ACPI interface
This reverts commit 13bed58ce874 (regulator: fixed: add support for ACPI interface). While there does appear to be a practical need to manage regulators on ACPI systems, using ad-hoc properties to describe regulators to the kernel presents a number of problems (especially should ACPI gain first class support for such things), and there are ongoing discussions as to how to manage this. Until there is a rough consensus, revert commit 13bed58ce8748d43, which hasn't been in a released kernel yet as discussed in [1] and the surrounding thread. [1] http://lkml.kernel.org/r/20170125184949.x2wkoo7kbaaajkjk@sirena.org.uk Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Lu Baolu <baolu.lu@linux.intel.com> Cc: Mark Brown <broonie@kernel.org> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'net/802/Makefile')