335 lines
7.4 KiB
C
335 lines
7.4 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 = of_node_get(tps->dev->of_node);
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struct tps65217_bl_pdata *pdata, *err;
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u32 val;
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node = of_find_node_by_name(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 < 0 ||
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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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if (tps->dev->of_node) {
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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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} else {
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data provided\n");
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return -EINVAL;
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}
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}
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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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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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},
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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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