2b12dfa124
Fix child-node lookup during probe, which ended up searching the whole
device tree depth-first starting at the parent rather than just matching
on its children.
This would only cause trouble if the child node is missing while there
is an unrelated node named "backlight" elsewhere in the tree.
Cc: stable <stable@vger.kernel.org> # 3.7
Fixes: eebfdc17cc ("backlight: Add TPS65217 WLED driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
335 lines
7.5 KiB
C
335 lines
7.5 KiB
C
/*
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* tps65217_bl.c
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*
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* TPS65217 backlight driver
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*
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* Copyright (C) 2012 Matthias Kaehlcke
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* Author: Matthias Kaehlcke <matthias@kaehlcke.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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#include <linux/mfd/tps65217.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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struct tps65217_bl {
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struct tps65217 *tps;
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struct device *dev;
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struct backlight_device *bl;
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bool is_enabled;
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};
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static int tps65217_bl_enable(struct tps65217_bl *tps65217_bl)
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{
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int rc;
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rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1,
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TPS65217_WLEDCTRL1_ISINK_ENABLE,
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TPS65217_WLEDCTRL1_ISINK_ENABLE, TPS65217_PROTECT_NONE);
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if (rc) {
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dev_err(tps65217_bl->dev,
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"failed to enable backlight: %d\n", rc);
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return rc;
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}
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tps65217_bl->is_enabled = true;
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dev_dbg(tps65217_bl->dev, "backlight enabled\n");
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return 0;
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}
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static int tps65217_bl_disable(struct tps65217_bl *tps65217_bl)
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{
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int rc;
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rc = tps65217_clear_bits(tps65217_bl->tps,
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TPS65217_REG_WLEDCTRL1,
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TPS65217_WLEDCTRL1_ISINK_ENABLE,
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TPS65217_PROTECT_NONE);
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if (rc) {
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dev_err(tps65217_bl->dev,
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"failed to disable backlight: %d\n", rc);
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return rc;
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}
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tps65217_bl->is_enabled = false;
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dev_dbg(tps65217_bl->dev, "backlight disabled\n");
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return 0;
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}
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static int tps65217_bl_update_status(struct backlight_device *bl)
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{
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struct tps65217_bl *tps65217_bl = bl_get_data(bl);
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int rc;
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int brightness = bl->props.brightness;
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if (bl->props.state & BL_CORE_SUSPENDED)
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brightness = 0;
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if ((bl->props.power != FB_BLANK_UNBLANK) ||
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(bl->props.fb_blank != FB_BLANK_UNBLANK))
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/* framebuffer in low power mode or blanking active */
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brightness = 0;
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if (brightness > 0) {
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rc = tps65217_reg_write(tps65217_bl->tps,
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TPS65217_REG_WLEDCTRL2,
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brightness - 1,
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TPS65217_PROTECT_NONE);
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if (rc) {
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dev_err(tps65217_bl->dev,
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"failed to set brightness level: %d\n", rc);
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return rc;
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}
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dev_dbg(tps65217_bl->dev, "brightness set to %d\n", brightness);
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if (!tps65217_bl->is_enabled)
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rc = tps65217_bl_enable(tps65217_bl);
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} else {
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rc = tps65217_bl_disable(tps65217_bl);
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}
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return rc;
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}
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static const struct backlight_ops tps65217_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = tps65217_bl_update_status,
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};
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static int tps65217_bl_hw_init(struct tps65217_bl *tps65217_bl,
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struct tps65217_bl_pdata *pdata)
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{
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int rc;
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rc = tps65217_bl_disable(tps65217_bl);
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if (rc)
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return rc;
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switch (pdata->isel) {
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case TPS65217_BL_ISET1:
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/* select ISET_1 current level */
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rc = tps65217_clear_bits(tps65217_bl->tps,
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TPS65217_REG_WLEDCTRL1,
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TPS65217_WLEDCTRL1_ISEL,
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TPS65217_PROTECT_NONE);
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if (rc) {
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dev_err(tps65217_bl->dev,
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"failed to select ISET1 current level: %d)\n",
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rc);
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return rc;
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}
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dev_dbg(tps65217_bl->dev, "selected ISET1 current level\n");
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break;
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case TPS65217_BL_ISET2:
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/* select ISET2 current level */
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rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1,
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TPS65217_WLEDCTRL1_ISEL,
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TPS65217_WLEDCTRL1_ISEL, TPS65217_PROTECT_NONE);
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if (rc) {
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dev_err(tps65217_bl->dev,
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"failed to select ISET2 current level: %d\n",
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rc);
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return rc;
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}
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dev_dbg(tps65217_bl->dev, "selected ISET2 current level\n");
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break;
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default:
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dev_err(tps65217_bl->dev,
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"invalid value for current level: %d\n", pdata->isel);
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return -EINVAL;
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}
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/* set PWM frequency */
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rc = tps65217_set_bits(tps65217_bl->tps,
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TPS65217_REG_WLEDCTRL1,
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TPS65217_WLEDCTRL1_FDIM_MASK,
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pdata->fdim,
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TPS65217_PROTECT_NONE);
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if (rc) {
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dev_err(tps65217_bl->dev,
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"failed to select PWM dimming frequency: %d\n",
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rc);
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return rc;
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}
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return 0;
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}
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#ifdef CONFIG_OF
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static struct tps65217_bl_pdata *
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tps65217_bl_parse_dt(struct platform_device *pdev)
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{
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struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
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struct device_node *node;
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struct tps65217_bl_pdata *pdata, *err;
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u32 val;
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node = of_get_child_by_name(tps->dev->of_node, "backlight");
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if (!node)
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return ERR_PTR(-ENODEV);
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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err = ERR_PTR(-ENOMEM);
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goto err;
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}
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pdata->isel = TPS65217_BL_ISET1;
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if (!of_property_read_u32(node, "isel", &val)) {
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if (val < TPS65217_BL_ISET1 ||
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val > TPS65217_BL_ISET2) {
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dev_err(&pdev->dev,
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"invalid 'isel' value in the device tree\n");
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err = ERR_PTR(-EINVAL);
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goto err;
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}
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pdata->isel = val;
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}
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pdata->fdim = TPS65217_BL_FDIM_200HZ;
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if (!of_property_read_u32(node, "fdim", &val)) {
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switch (val) {
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case 100:
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pdata->fdim = TPS65217_BL_FDIM_100HZ;
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break;
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case 200:
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pdata->fdim = TPS65217_BL_FDIM_200HZ;
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break;
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case 500:
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pdata->fdim = TPS65217_BL_FDIM_500HZ;
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break;
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case 1000:
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pdata->fdim = TPS65217_BL_FDIM_1000HZ;
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break;
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default:
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dev_err(&pdev->dev,
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"invalid 'fdim' value in the device tree\n");
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err = ERR_PTR(-EINVAL);
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goto err;
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}
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}
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if (!of_property_read_u32(node, "default-brightness", &val)) {
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if (val > 100) {
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dev_err(&pdev->dev,
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"invalid 'default-brightness' value in the device tree\n");
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err = ERR_PTR(-EINVAL);
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goto err;
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}
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pdata->dft_brightness = val;
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}
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of_node_put(node);
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return pdata;
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err:
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of_node_put(node);
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return err;
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}
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#else
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static struct tps65217_bl_pdata *
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tps65217_bl_parse_dt(struct platform_device *pdev)
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{
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return NULL;
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}
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#endif
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static int tps65217_bl_probe(struct platform_device *pdev)
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{
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int rc;
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struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
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struct tps65217_bl *tps65217_bl;
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struct tps65217_bl_pdata *pdata;
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struct backlight_properties bl_props;
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pdata = tps65217_bl_parse_dt(pdev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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tps65217_bl = devm_kzalloc(&pdev->dev, sizeof(*tps65217_bl),
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GFP_KERNEL);
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if (tps65217_bl == NULL)
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return -ENOMEM;
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tps65217_bl->tps = tps;
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tps65217_bl->dev = &pdev->dev;
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tps65217_bl->is_enabled = false;
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rc = tps65217_bl_hw_init(tps65217_bl, pdata);
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if (rc)
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return rc;
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memset(&bl_props, 0, sizeof(struct backlight_properties));
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bl_props.type = BACKLIGHT_RAW;
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bl_props.max_brightness = 100;
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tps65217_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
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tps65217_bl->dev, tps65217_bl,
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&tps65217_bl_ops, &bl_props);
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if (IS_ERR(tps65217_bl->bl)) {
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dev_err(tps65217_bl->dev,
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"registration of backlight device failed: %d\n", rc);
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return PTR_ERR(tps65217_bl->bl);
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}
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tps65217_bl->bl->props.brightness = pdata->dft_brightness;
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backlight_update_status(tps65217_bl->bl);
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platform_set_drvdata(pdev, tps65217_bl);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id tps65217_bl_of_match[] = {
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{ .compatible = "ti,tps65217-bl", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, tps65217_bl_of_match);
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#endif
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static struct platform_driver tps65217_bl_driver = {
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.probe = tps65217_bl_probe,
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.driver = {
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.name = "tps65217-bl",
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.of_match_table = of_match_ptr(tps65217_bl_of_match),
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},
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};
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module_platform_driver(tps65217_bl_driver);
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MODULE_DESCRIPTION("TPS65217 Backlight driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Matthias Kaehlcke <matthias@kaehlcke.net>");
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