From patchwork Fri Mar 30 17:24:12 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 10318201 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0F4BC60383 for ; Fri, 30 Mar 2018 17:25:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F157E28739 for ; Fri, 30 Mar 2018 17:25:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E4DE72A604; Fri, 30 Mar 2018 17:25:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2CA4228739 for ; Fri, 30 Mar 2018 17:25:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752675AbeC3RYq (ORCPT ); Fri, 30 Mar 2018 13:24:46 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:58976 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752077AbeC3RYn (ORCPT ); Fri, 30 Mar 2018 13:24:43 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: sre) with ESMTPSA id 0B7A9260BD3 From: Sebastian Reichel To: Sebastian Reichel , Milo Kim , Lee Jones , Daniel Thompson , Rob Herring , Tony Lindgren Cc: Jingoo Han , Mark Rutland , linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, devicetree@vger.kernel.org, linux-omap@vger.kernel.org, Sebastian Reichel , Milo Kim Subject: [PATCHv4 08/10] backlight: add TI LMU backlight driver Date: Fri, 30 Mar 2018 19:24:12 +0200 Message-Id: <20180330172414.26575-9-sebastian.reichel@collabora.co.uk> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180330172414.26575-1-sebastian.reichel@collabora.co.uk> References: <20180330172414.26575-1-sebastian.reichel@collabora.co.uk> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This adds backlight support for the following TI LMU chips: LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697. Signed-off-by: Milo Kim [add LED subsystem support for keyboard backlight and rework DT binding according to Rob Herrings feedback] Signed-off-by: Sebastian Reichel --- drivers/video/backlight/Kconfig | 7 + drivers/video/backlight/Makefile | 3 + drivers/video/backlight/ti-lmu-backlight-core.c | 666 ++++++++++++++++++++++++ drivers/video/backlight/ti-lmu-backlight-data.c | 304 +++++++++++ drivers/video/backlight/ti-lmu-backlight-data.h | 95 ++++ 5 files changed, 1075 insertions(+) create mode 100644 drivers/video/backlight/ti-lmu-backlight-core.c create mode 100644 drivers/video/backlight/ti-lmu-backlight-data.c create mode 100644 drivers/video/backlight/ti-lmu-backlight-data.h diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 5d2d0d7e8100..27e6c5a0add8 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -427,6 +427,13 @@ config BACKLIGHT_SKY81452 To compile this driver as a module, choose M here: the module will be called sky81452-backlight +config BACKLIGHT_TI_LMU + tristate "Backlight driver for TI LMU" + depends on BACKLIGHT_CLASS_DEVICE && MFD_TI_LMU + help + Say Y to enable the backlight driver for TI LMU devices. + This supports LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697. + config BACKLIGHT_TPS65217 tristate "TPS65217 Backlight" depends on BACKLIGHT_CLASS_DEVICE && MFD_TPS65217 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 19da71d518bf..a1132d3dfd4c 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -53,6 +53,9 @@ obj-$(CONFIG_BACKLIGHT_PM8941_WLED) += pm8941-wled.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o +ti-lmu-backlight-objs := ti-lmu-backlight-core.o \ + ti-lmu-backlight-data.o +obj-$(CONFIG_BACKLIGHT_TI_LMU) += ti-lmu-backlight.o obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o diff --git a/drivers/video/backlight/ti-lmu-backlight-core.c b/drivers/video/backlight/ti-lmu-backlight-core.c new file mode 100644 index 000000000000..a6099581edd7 --- /dev/null +++ b/drivers/video/backlight/ti-lmu-backlight-core.c @@ -0,0 +1,666 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2015 Texas Instruments + * Copyright 2018 Sebastian Reichel + * + * TI LMU Backlight driver, based on previous work from + * Milo Kim + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ti-lmu-backlight-data.h" + +enum ti_lmu_bl_ctrl_mode { + BL_REGISTER_BASED, + BL_PWM_BASED, +}; + +enum ti_lmu_bl_type { + TI_LMU_BL, /* backlight userspace interface */ + TI_LMU_LED, /* led userspace interface */ +}; + +enum ti_lmu_bl_ramp_mode { + BL_RAMP_UP, + BL_RAMP_DOWN, +}; + +#define DEFAULT_PWM_NAME "lmu-backlight" +#define NUM_DUAL_CHANNEL 2 +#define LMU_BACKLIGHT_DUAL_CHANNEL_USED (BIT(0) | BIT(1)) +#define LMU_BACKLIGHT_11BIT_LSB_MASK (BIT(0) | BIT(1) | BIT(2)) +#define LMU_BACKLIGHT_11BIT_MSB_SHIFT 3 + +struct ti_lmu_bank { + struct device *dev; + int bank_id; + const struct ti_lmu_bl_cfg *cfg; + struct ti_lmu *lmu; + const char *label; + int leds; + int current_brightness; + u32 default_brightness; + u32 ramp_up_msec; + u32 ramp_down_msec; + u32 pwm_period; + enum ti_lmu_bl_ctrl_mode mode; + enum ti_lmu_bl_type type; + + struct notifier_block nb; + + struct backlight_device *backlight; + struct led_classdev *led; +}; + +static int ti_lmu_bl_enable(struct ti_lmu_bank *lmu_bank, bool enable) +{ + struct regmap *regmap = lmu_bank->lmu->regmap; + unsigned long enable_time = lmu_bank->cfg->reginfo->enable_usec; + u8 *reg = lmu_bank->cfg->reginfo->enable; + u8 mask = BIT(lmu_bank->bank_id); + u8 val = (enable == true) ? mask : 0; + int ret; + + if (!reg) + return -EINVAL; + + ret = regmap_update_bits(regmap, *reg, mask, val); + if (ret) + return ret; + + if (enable_time > 0) + usleep_range(enable_time, enable_time + 100); + + return 0; +} + +static int ti_lmu_bl_update_brightness_register(struct ti_lmu_bank *lmu_bank, + int brightness) +{ + const struct ti_lmu_bl_cfg *cfg = lmu_bank->cfg; + const struct ti_lmu_bl_reg *reginfo = cfg->reginfo; + struct regmap *regmap = lmu_bank->lmu->regmap; + u8 reg, val; + int ret; + + /* + * Brightness register update + * + * 11 bit dimming: update LSB bits and write MSB byte. + * MSB brightness should be shifted. + * 8 bit dimming: write MSB byte. + */ + if (cfg->max_brightness == MAX_BRIGHTNESS_11BIT) { + reg = reginfo->brightness_lsb[lmu_bank->bank_id]; + ret = regmap_update_bits(regmap, reg, + LMU_BACKLIGHT_11BIT_LSB_MASK, + brightness); + if (ret) + return ret; + + val = brightness >> LMU_BACKLIGHT_11BIT_MSB_SHIFT; + } else { + val = brightness; + } + + reg = reginfo->brightness_msb[lmu_bank->bank_id]; + return regmap_write(regmap, reg, val); +} + +static int ti_lmu_bl_pwm_ctrl(struct ti_lmu_bank *lmu_bank, int brightness) +{ + int max_brightness = lmu_bank->cfg->max_brightness; + struct pwm_state state = { }; + int ret; + + if (!lmu_bank->lmu->pwm) { + dev_err(lmu_bank->dev, "Missing PWM device!\n"); + return -ENODEV; + } + + pwm_init_state(lmu_bank->lmu->pwm, &state); + state.period = lmu_bank->pwm_period; + state.duty_cycle = brightness * state.period / max_brightness; + + if (state.duty_cycle) + state.enabled = true; + else + state.enabled = false; + + ret = pwm_apply_state(lmu_bank->lmu->pwm, &state); + if (ret) + dev_err(lmu_bank->dev, "Failed to configure PWM: %d", ret); + + return ret; +} + +static int ti_lmu_bl_set_brightness(struct ti_lmu_bank *lmu_bank, + int brightness) +{ + const struct ti_lmu_bl_cfg *cfg = lmu_bank->cfg; + bool enable = brightness > 0; + int ret; + + ret = ti_lmu_bl_enable(lmu_bank, enable); + if (ret) + return ret; + + if (lmu_bank->mode == BL_PWM_BASED) { + ti_lmu_bl_pwm_ctrl(lmu_bank, brightness); + + switch (cfg->pwm_action) { + case UPDATE_PWM_ONLY: + /* No register update is required */ + return 0; + case UPDATE_MAX_BRT: + /* + * PWM can start from any non-zero code and dim down + * to zero. So, brightness register should be updated + * even in PWM mode. + */ + if (brightness > 0) + brightness = MAX_BRIGHTNESS_11BIT; + else + brightness = 0; + break; + default: + break; + } + } + + lmu_bank->current_brightness = brightness; + + return ti_lmu_bl_update_brightness_register(lmu_bank, brightness); +} + +static int ti_lmu_bl_update_status(struct backlight_device *bl_dev) +{ + struct ti_lmu_bank *lmu_bank = bl_get_data(bl_dev); + int brightness = bl_dev->props.brightness; + + if (bl_dev->props.state & BL_CORE_SUSPENDED) + brightness = 0; + + return ti_lmu_bl_set_brightness(lmu_bank, brightness); +} + +static const struct backlight_ops lmu_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = ti_lmu_bl_update_status, +}; + +static int ti_lmu_bl_set_led_blocking(struct led_classdev *ledc, + enum led_brightness value) +{ + struct ti_lmu_bank *lmu_bank = dev_get_drvdata(ledc->dev->parent); + int brightness = value; + + return ti_lmu_bl_set_brightness(lmu_bank, brightness); +} + +static int ti_lmu_bl_check_channel(struct ti_lmu_bank *lmu_bank) +{ + const struct ti_lmu_bl_cfg *cfg = lmu_bank->cfg; + const struct ti_lmu_bl_reg *reginfo = cfg->reginfo; + + if (!reginfo->brightness_msb) + return -EINVAL; + + if (cfg->max_brightness > MAX_BRIGHTNESS_8BIT) { + if (!reginfo->brightness_lsb) + return -EINVAL; + } + + return 0; +} + +static int ti_lmu_bl_create_channel(struct ti_lmu_bank *lmu_bank) +{ + struct regmap *regmap = lmu_bank->lmu->regmap; + const struct lmu_bl_reg_data *regdata = lmu_bank->cfg->reginfo->channel; + int num_channels = lmu_bank->cfg->num_channels; + unsigned long led_sources = lmu_bank->leds; + int i, ret; + u8 shift; + + /* + * How to create backlight output channels: + * Check 'led_sources' bit and update registers. + * + * 1) Dual channel configuration + * The 1st register data is used for single channel. + * The 2nd register data is used for dual channel. + * + * 2) Multiple channel configuration + * Each register data is mapped to bank ID. + * Bit shift operation is defined in channel registers. + * + * Channel register data consists of address, mask, value. + */ + + if (num_channels == NUM_DUAL_CHANNEL) { + if (led_sources == LMU_BACKLIGHT_DUAL_CHANNEL_USED) + regdata++; + + return regmap_update_bits(regmap, regdata->reg, regdata->mask, + regdata->val); + } + + for (i = 0; regdata && i < num_channels; i++) { + /* + * Note that the result of regdata->val is shift bit. + * The bank_id should be shifted for the channel configuration. + */ + if (test_bit(i, &led_sources)) { + shift = regdata->val; + ret = regmap_update_bits(regmap, regdata->reg, + regdata->mask, + lmu_bank->bank_id << shift); + if (ret) + return ret; + } + + regdata++; + } + + return 0; +} + +static int ti_lmu_bl_update_ctrl_mode(struct ti_lmu_bank *lmu_bank) +{ + struct regmap *regmap = lmu_bank->lmu->regmap; + const struct lmu_bl_reg_data *regdata = + lmu_bank->cfg->reginfo->mode + lmu_bank->bank_id; + u8 val = regdata->val; + + if (!regdata) + return 0; + + /* + * Update PWM configuration register. + * If the mode is register based, then clear the bit. + */ + if (lmu_bank->mode != BL_PWM_BASED) + val = 0; + + return regmap_update_bits(regmap, regdata->reg, regdata->mask, val); +} + +static int ti_lmu_bl_convert_ramp_to_index(struct ti_lmu_bank *lmu_bank, + enum ti_lmu_bl_ramp_mode mode) +{ + const int *ramp_table = lmu_bank->cfg->ramp_table; + const int size = lmu_bank->cfg->size_ramp; + unsigned int msec; + int i; + + if (!ramp_table) + return -EINVAL; + + switch (mode) { + case BL_RAMP_UP: + msec = lmu_bank->ramp_up_msec; + break; + case BL_RAMP_DOWN: + msec = lmu_bank->ramp_down_msec; + break; + default: + return -EINVAL; + } + + if (msec <= ramp_table[0]) + return 0; + + if (msec > ramp_table[size - 1]) + return size - 1; + + for (i = 1; i < size; i++) { + if (msec == ramp_table[i]) + return i; + + /* Find an approximate index by looking up the table */ + if (msec > ramp_table[i - 1] && msec < ramp_table[i]) { + if (msec - ramp_table[i - 1] < ramp_table[i] - msec) + return i - 1; + else + return i; + } + } + + return -EINVAL; +} + + +static int ti_lmu_bl_set_ramp(struct ti_lmu_bank *lmu_bank) +{ + struct regmap *regmap = lmu_bank->lmu->regmap; + const struct ti_lmu_bl_reg *reginfo = lmu_bank->cfg->reginfo; + int offset = reginfo->ramp_reg_offset; + int i, ret, index; + struct lmu_bl_reg_data regdata; + + for (i = BL_RAMP_UP; i <= BL_RAMP_DOWN; i++) { + index = ti_lmu_bl_convert_ramp_to_index(lmu_bank, i); + if (index > 0) { + if (!reginfo->ramp) + break; + + regdata = reginfo->ramp[i]; + if (lmu_bank->bank_id != 0) + regdata.val += offset; + + /* regdata.val is shift bit */ + ret = regmap_update_bits(regmap, regdata.reg, + regdata.mask, + index << regdata.val); + if (ret) + return ret; + } + } + + return 0; +} + +static int ti_lmu_bl_configure(struct ti_lmu_bank *lmu_bank) +{ + int ret; + + ret = ti_lmu_bl_check_channel(lmu_bank); + if (ret) + return ret; + + ret = ti_lmu_bl_create_channel(lmu_bank); + if (ret) + return ret; + + ret = ti_lmu_bl_update_ctrl_mode(lmu_bank); + if (ret) + return ret; + + return ti_lmu_bl_set_ramp(lmu_bank); +} + +static int ti_lmu_bl_register_backlight(struct ti_lmu_bank *lmu_bank) +{ + struct backlight_device *bl_dev; + struct backlight_properties props; + + if (lmu_bank->type != TI_LMU_BL) + return -EINVAL; + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_PLATFORM; + props.brightness = lmu_bank->default_brightness; + props.max_brightness = lmu_bank->cfg->max_brightness; + + bl_dev = devm_backlight_device_register(lmu_bank->dev, lmu_bank->label, + lmu_bank->dev, lmu_bank, + &lmu_backlight_ops, &props); + if (IS_ERR(bl_dev)) + return PTR_ERR(bl_dev); + + lmu_bank->backlight = bl_dev; + + return 0; +} + +static int ti_lmu_bl_register_led(struct ti_lmu_bank *lmu_bank) +{ + int err; + + if (lmu_bank->type != TI_LMU_LED) + return -EINVAL; + + lmu_bank->led = devm_kzalloc(lmu_bank->dev, sizeof(*lmu_bank->led), + GFP_KERNEL); + if (!lmu_bank->led) + return -ENOMEM; + + lmu_bank->led->name = lmu_bank->label; + lmu_bank->led->max_brightness = lmu_bank->cfg->max_brightness; + lmu_bank->led->brightness_set_blocking = + ti_lmu_bl_set_led_blocking; + + err = devm_led_classdev_register(lmu_bank->dev, lmu_bank->led); + if (err) + return err; + + return 0; +} + +static int ti_lmu_bl_add_device(struct ti_lmu_bank *lmu_bank) +{ + switch (lmu_bank->type) { + case TI_LMU_BL: + return ti_lmu_bl_register_backlight(lmu_bank); + case TI_LMU_LED: + return ti_lmu_bl_register_led(lmu_bank); + default: + return -EINVAL; + } +} + +static int setup_of_node(struct platform_device *pdev) +{ + struct device_node *parent_node = pdev->dev.parent->of_node; + char *name; + + if (!parent_node) + return 0; + + name = kasprintf(GFP_KERNEL, "bank%d", pdev->id); + if (!name) + return -ENOMEM; + + pdev->dev.of_node = of_get_child_by_name(parent_node, name); + kfree(name); + + if (!pdev->dev.of_node) + return -ENODEV; + + return 0; +} + +static int ti_lmu_parse_led_sources(struct device *dev) +{ + unsigned long mask = 0; + int ret; + int size, i; + u32 *leds; + + size = device_property_read_u32_array(dev, "ti,led-sources", NULL, 0); + if (size <= 0) { + dev_err(dev, "Missing or malformed property led-sources: %d\n", + size); + return size < 0 ? size : -EINVAL; + } + + leds = kmalloc_array(size, sizeof(u32), GFP_KERNEL); + if (!leds) + return -ENOMEM; + + ret = device_property_read_u32_array(dev, "ti,led-sources", leds, size); + if (ret) { + dev_err(dev, "Failed to read led-sources property: %d\n", ret); + goto out; + } + + for (i = 0; i < size; i++) + set_bit(leds[i], &mask); + + ret = mask; + +out: + kfree(leds); + return ret; +} + +static int ti_lmu_bl_init(struct ti_lmu_bank *lmu_bank) +{ + struct regmap *regmap = lmu_bank->lmu->regmap; + const struct lmu_bl_reg_data *regdata = + lmu_bank->cfg->reginfo->init; + int num_init = lmu_bank->cfg->reginfo->num_init; + int i, ret; + + if (lmu_bank->lmu->backlight_initialized) + return 0; + lmu_bank->lmu->backlight_initialized = true; + + for (i = 0; regdata && i < num_init; i++) { + ret = regmap_update_bits(regmap, regdata->reg, regdata->mask, + regdata->val); + if (ret) + return ret; + + regdata++; + } + + return 0; +} + +static int ti_lmu_bl_reload(struct ti_lmu_bank *lmu_bank) +{ + int err; + + ti_lmu_bl_init(lmu_bank); + + err = ti_lmu_bl_configure(lmu_bank); + if (err) + return err; + + return ti_lmu_bl_set_brightness(lmu_bank, lmu_bank->current_brightness); +} + +static int ti_lmu_bl_monitor_notifier(struct notifier_block *nb, + unsigned long action, void *unused) +{ + struct ti_lmu_bank *lmu_bank = container_of(nb, struct ti_lmu_bank, nb); + + if (action == LMU_EVENT_MONITOR_DONE) { + if (ti_lmu_bl_reload(lmu_bank)) + return NOTIFY_STOP; + } + + return NOTIFY_OK; +} + +static int ti_lmu_bl_probe(struct platform_device *pdev) +{ + struct ti_lmu_bank *lmu_bank; + int err; + + err = setup_of_node(pdev); + if (err) + return err; + + lmu_bank = devm_kzalloc(&pdev->dev, sizeof(*lmu_bank), GFP_KERNEL); + if (!lmu_bank) + return -ENOMEM; + lmu_bank->dev = &pdev->dev; + dev_set_drvdata(&pdev->dev, lmu_bank); + + err = device_property_read_string(&pdev->dev, "label", + &lmu_bank->label); + if (err) + return err; + + lmu_bank->type = TI_LMU_BL; + if (!strcmp(lmu_bank->label, "keyboard")) { + lmu_bank->type = TI_LMU_LED; + lmu_bank->label = "kbd_backlight"; + } + + lmu_bank->leds = ti_lmu_parse_led_sources(&pdev->dev); + if (lmu_bank->leds < 0) + return lmu_bank->leds; + else if (lmu_bank->leds == 0) + return -EINVAL; + + device_property_read_u32(&pdev->dev, "default-brightness-level", + &lmu_bank->default_brightness); + device_property_read_u32(&pdev->dev, "ti,ramp-up-ms", + &lmu_bank->ramp_up_msec); + device_property_read_u32(&pdev->dev, "ti,ramp-down-ms", + &lmu_bank->ramp_down_msec); + device_property_read_u32(&pdev->dev, "pwm-period", + &lmu_bank->pwm_period); + + if (lmu_bank->pwm_period > 0) + lmu_bank->mode = BL_PWM_BASED; + else + lmu_bank->mode = BL_REGISTER_BASED; + + lmu_bank->lmu = dev_get_drvdata(pdev->dev.parent); + lmu_bank->cfg = &lmu_bl_cfg[lmu_bank->lmu->id]; + lmu_bank->bank_id = pdev->id; + + ti_lmu_bl_init(lmu_bank); + + err = ti_lmu_bl_configure(lmu_bank); + if (err) + return err; + + err = ti_lmu_bl_add_device(lmu_bank); + if (err) + return err; + + err = ti_lmu_bl_set_brightness(lmu_bank, + lmu_bank->default_brightness); + if (err) + return err; + + /* + * Notifier callback is required because backlight device needs + * reconfiguration after fault detection procedure is done by + * ti-lmu-fault-monitor driver. + */ + if (lmu_bank->cfg->fault_monitor_used) { + lmu_bank->nb.notifier_call = ti_lmu_bl_monitor_notifier; + err = blocking_notifier_chain_register(&lmu_bank->lmu->notifier, + &lmu_bank->nb); + if (err) + return err; + } + + return 0; +} + +static int ti_lmu_bl_remove(struct platform_device *pdev) +{ + struct ti_lmu_bank *lmu_bank = platform_get_drvdata(pdev); + + if (lmu_bank->cfg->fault_monitor_used) + blocking_notifier_chain_unregister(&lmu_bank->lmu->notifier, + &lmu_bank->nb); + + ti_lmu_bl_set_brightness(lmu_bank, 0); + + return 0; +} + +static struct platform_driver ti_lmu_bl_driver = { + .probe = ti_lmu_bl_probe, + .remove = ti_lmu_bl_remove, + .driver = { + .name = "ti-lmu-led-backlight", + }, +}; +module_platform_driver(ti_lmu_bl_driver) + +MODULE_DESCRIPTION("TI LMU Backlight LED Driver"); +MODULE_AUTHOR("Sebastian Reichel"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:ti-lmu-led-backlight"); diff --git a/drivers/video/backlight/ti-lmu-backlight-data.c b/drivers/video/backlight/ti-lmu-backlight-data.c new file mode 100644 index 000000000000..583136cb934d --- /dev/null +++ b/drivers/video/backlight/ti-lmu-backlight-data.c @@ -0,0 +1,304 @@ +/* + * TI LMU (Lighting Management Unit) Backlight Device Data + * + * Copyright 2015 Texas Instruments + * + * Author: Milo Kim + * + * 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 "ti-lmu-backlight-data.h" + +/* LM3532 */ +static const struct lmu_bl_reg_data lm3532_init_data[] = { + { LM3532_REG_ZONE_CFG_A, LM3532_ZONE_MASK, LM3532_ZONE_0 }, + { LM3532_REG_ZONE_CFG_B, LM3532_ZONE_MASK, LM3532_ZONE_1 }, + { LM3532_REG_ZONE_CFG_C, LM3532_ZONE_MASK, LM3532_ZONE_2 }, +}; + +static const struct lmu_bl_reg_data lm3532_channel_data[] = { + { LM3532_REG_OUTPUT_CFG, LM3532_ILED1_CFG_MASK, + LM3532_ILED1_CFG_SHIFT }, + { LM3532_REG_OUTPUT_CFG, LM3532_ILED2_CFG_MASK, + LM3532_ILED2_CFG_SHIFT }, + { LM3532_REG_OUTPUT_CFG, LM3532_ILED3_CFG_MASK, + LM3532_ILED3_CFG_SHIFT }, +}; + +static const struct lmu_bl_reg_data lm3532_mode_data[] = { + { LM3532_REG_PWM_A_CFG, LM3532_PWM_A_MASK, LM3532_PWM_ZONE_0 }, + { LM3532_REG_PWM_B_CFG, LM3532_PWM_B_MASK, LM3532_PWM_ZONE_1 }, + { LM3532_REG_PWM_C_CFG, LM3532_PWM_C_MASK, LM3532_PWM_ZONE_2 }, +}; + +static const struct lmu_bl_reg_data lm3532_ramp_data[] = { + { LM3532_REG_RAMPUP, LM3532_RAMPUP_MASK, LM3532_RAMPUP_SHIFT }, + { LM3532_REG_RAMPDN, LM3532_RAMPDN_MASK, LM3532_RAMPDN_SHIFT }, +}; + +static u8 lm3532_enable_reg = LM3532_REG_ENABLE; + +static u8 lm3532_brightness_regs[] = { + LM3532_REG_BRT_A, + LM3532_REG_BRT_B, + LM3532_REG_BRT_C, +}; + +static const struct ti_lmu_bl_reg lm3532_reg_info = { + .init = lm3532_init_data, + .num_init = ARRAY_SIZE(lm3532_init_data), + .channel = lm3532_channel_data, + .mode = lm3532_mode_data, + .ramp = lm3532_ramp_data, + .enable = &lm3532_enable_reg, + .brightness_msb = lm3532_brightness_regs, +}; + +/* LM3631 */ +static const struct lmu_bl_reg_data lm3631_init_data[] = { + { LM3631_REG_BRT_MODE, LM3631_MODE_MASK, LM3631_DEFAULT_MODE }, + { LM3631_REG_BL_CFG, LM3631_MAP_MASK, LM3631_EXPONENTIAL_MAP }, +}; + +static const struct lmu_bl_reg_data lm3631_channel_data[] = { + { LM3631_REG_BL_CFG, LM3631_BL_CHANNEL_MASK, LM3631_BL_SINGLE_CHANNEL }, + { LM3631_REG_BL_CFG, LM3631_BL_CHANNEL_MASK, LM3631_BL_DUAL_CHANNEL }, +}; + +static const struct lmu_bl_reg_data lm3631_ramp_data[] = { + { LM3631_REG_SLOPE, LM3631_SLOPE_MASK, LM3631_SLOPE_SHIFT }, +}; + +static u8 lm3631_enable_reg = LM3631_REG_DEVCTRL; +static u8 lm3631_brightness_msb_reg = LM3631_REG_BRT_MSB; +static u8 lm3631_brightness_lsb_reg = LM3631_REG_BRT_LSB; + +static const struct ti_lmu_bl_reg lm3631_reg_info = { + .init = lm3631_init_data, + .num_init = ARRAY_SIZE(lm3631_init_data), + .channel = lm3631_channel_data, + .ramp = lm3631_ramp_data, + .enable = &lm3631_enable_reg, + .brightness_msb = &lm3631_brightness_msb_reg, + .brightness_lsb = &lm3631_brightness_lsb_reg, +}; + +/* LM3632 */ +static const struct lmu_bl_reg_data lm3632_init_data[] = { + { LM3632_REG_CONFIG1, LM3632_OVP_MASK, LM3632_OVP_25V }, + { LM3632_REG_CONFIG2, LM3632_SWFREQ_MASK, LM3632_SWFREQ_1MHZ }, +}; + +static const struct lmu_bl_reg_data lm3632_channel_data[] = { + { LM3632_REG_ENABLE, LM3632_BL_CHANNEL_MASK, LM3632_BL_SINGLE_CHANNEL }, + { LM3632_REG_ENABLE, LM3632_BL_CHANNEL_MASK, LM3632_BL_DUAL_CHANNEL }, +}; + +static const struct lmu_bl_reg_data lm3632_mode_data[] = { + { LM3632_REG_IO_CTRL, LM3632_PWM_MASK, LM3632_PWM_MODE }, +}; + +static u8 lm3632_enable_reg = LM3632_REG_ENABLE; +static u8 lm3632_brightness_msb_reg = LM3632_REG_BRT_MSB; +static u8 lm3632_brightness_lsb_reg = LM3632_REG_BRT_LSB; + +static const struct ti_lmu_bl_reg lm3632_reg_info = { + .init = lm3632_init_data, + .num_init = ARRAY_SIZE(lm3632_init_data), + .channel = lm3632_channel_data, + .mode = lm3632_mode_data, + .enable = &lm3632_enable_reg, + .brightness_msb = &lm3632_brightness_msb_reg, + .brightness_lsb = &lm3632_brightness_lsb_reg, +}; + +/* LM3633 */ +static const struct lmu_bl_reg_data lm3633_init_data[] = { + { LM3633_REG_BOOST_CFG, LM3633_OVP_MASK, LM3633_OVP_40V }, + { LM3633_REG_BL_RAMP_CONF, LM3633_BL_RAMP_MASK, LM3633_BL_RAMP_EACH }, +}; + +static const struct lmu_bl_reg_data lm3633_channel_data[] = { + { LM3633_REG_HVLED_OUTPUT_CFG, LM3633_HVLED1_CFG_MASK, + LM3633_HVLED1_CFG_SHIFT }, + { LM3633_REG_HVLED_OUTPUT_CFG, LM3633_HVLED2_CFG_MASK, + LM3633_HVLED2_CFG_SHIFT }, + { LM3633_REG_HVLED_OUTPUT_CFG, LM3633_HVLED3_CFG_MASK, + LM3633_HVLED3_CFG_SHIFT }, +}; + +static const struct lmu_bl_reg_data lm3633_mode_data[] = { + { LM3633_REG_PWM_CFG, LM3633_PWM_A_MASK, LM3633_PWM_A_MASK }, + { LM3633_REG_PWM_CFG, LM3633_PWM_B_MASK, LM3633_PWM_B_MASK }, +}; + +static const struct lmu_bl_reg_data lm3633_ramp_data[] = { + { LM3633_REG_BL0_RAMP, LM3633_BL_RAMPUP_MASK, LM3633_BL_RAMPUP_SHIFT }, + { LM3633_REG_BL0_RAMP, LM3633_BL_RAMPDN_MASK, LM3633_BL_RAMPDN_SHIFT }, +}; + +static u8 lm3633_enable_reg = LM3633_REG_ENABLE; + +static u8 lm3633_brightness_msb_regs[] = { + LM3633_REG_BRT_HVLED_A_MSB, + LM3633_REG_BRT_HVLED_B_MSB, +}; + +static u8 lm3633_brightness_lsb_regs[] = { + LM3633_REG_BRT_HVLED_A_LSB, + LM3633_REG_BRT_HVLED_B_LSB, +}; + +static const struct ti_lmu_bl_reg lm3633_reg_info = { + .init = lm3633_init_data, + .num_init = ARRAY_SIZE(lm3633_init_data), + .channel = lm3633_channel_data, + .mode = lm3633_mode_data, + .ramp = lm3633_ramp_data, + .ramp_reg_offset = 1, /* For LM3633_REG_BL1_RAMPUP/DN */ + .enable = &lm3633_enable_reg, + .brightness_msb = lm3633_brightness_msb_regs, + .brightness_lsb = lm3633_brightness_lsb_regs, +}; + +/* LM3695 */ +static const struct lmu_bl_reg_data lm3695_init_data[] = { + { LM3695_REG_GP, LM3695_BRT_RW_MASK, LM3695_BRT_RW_MASK }, +}; + +static const struct lmu_bl_reg_data lm3695_channel_data[] = { + { LM3695_REG_GP, LM3695_BL_CHANNEL_MASK, LM3695_BL_SINGLE_CHANNEL }, + { LM3695_REG_GP, LM3695_BL_CHANNEL_MASK, LM3695_BL_DUAL_CHANNEL }, +}; + +static u8 lm3695_enable_reg = LM3695_REG_GP; +static u8 lm3695_brightness_msb_reg = LM3695_REG_BRT_MSB; +static u8 lm3695_brightness_lsb_reg = LM3695_REG_BRT_LSB; + +static const struct ti_lmu_bl_reg lm3695_reg_info = { + .init = lm3695_init_data, + .num_init = ARRAY_SIZE(lm3695_init_data), + .channel = lm3695_channel_data, + .enable = &lm3695_enable_reg, + .enable_usec = 600, + .brightness_msb = &lm3695_brightness_msb_reg, + .brightness_lsb = &lm3695_brightness_lsb_reg, +}; + +/* LM3697 */ +static const struct lmu_bl_reg_data lm3697_init_data[] = { + { LM3697_REG_RAMP_CONF, LM3697_RAMP_MASK, LM3697_RAMP_EACH }, +}; + +static const struct lmu_bl_reg_data lm3697_channel_data[] = { + { LM3697_REG_HVLED_OUTPUT_CFG, LM3697_HVLED1_CFG_MASK, + LM3697_HVLED1_CFG_SHIFT }, + { LM3697_REG_HVLED_OUTPUT_CFG, LM3697_HVLED2_CFG_MASK, + LM3697_HVLED2_CFG_SHIFT }, + { LM3697_REG_HVLED_OUTPUT_CFG, LM3697_HVLED3_CFG_MASK, + LM3697_HVLED3_CFG_SHIFT }, +}; + +static const struct lmu_bl_reg_data lm3697_mode_data[] = { + { LM3697_REG_PWM_CFG, LM3697_PWM_A_MASK, LM3697_PWM_A_MASK }, + { LM3697_REG_PWM_CFG, LM3697_PWM_B_MASK, LM3697_PWM_B_MASK }, +}; + +static const struct lmu_bl_reg_data lm3697_ramp_data[] = { + { LM3697_REG_BL0_RAMP, LM3697_RAMPUP_MASK, LM3697_RAMPUP_SHIFT }, + { LM3697_REG_BL0_RAMP, LM3697_RAMPDN_MASK, LM3697_RAMPDN_SHIFT }, +}; + +static u8 lm3697_enable_reg = LM3697_REG_ENABLE; + +static u8 lm3697_brightness_msb_regs[] = { + LM3697_REG_BRT_A_MSB, + LM3697_REG_BRT_B_MSB, +}; + +static u8 lm3697_brightness_lsb_regs[] = { + LM3697_REG_BRT_A_LSB, + LM3697_REG_BRT_B_LSB, +}; + +static const struct ti_lmu_bl_reg lm3697_reg_info = { + .init = lm3697_init_data, + .num_init = ARRAY_SIZE(lm3697_init_data), + .channel = lm3697_channel_data, + .mode = lm3697_mode_data, + .ramp = lm3697_ramp_data, + .ramp_reg_offset = 1, /* For LM3697_REG_BL1_RAMPUP/DN */ + .enable = &lm3697_enable_reg, + .brightness_msb = lm3697_brightness_msb_regs, + .brightness_lsb = lm3697_brightness_lsb_regs, +}; + +static int lm3532_ramp_table[] = { 0, 1, 2, 4, 8, 16, 32, 65 }; + +static int lm3631_ramp_table[] = { + 0, 1, 2, 5, 10, 20, 50, 100, + 250, 500, 750, 1000, 1500, 2000, 3000, 4000, +}; + +static int common_ramp_table[] = { + 2, 250, 500, 1000, 2000, 4000, 8000, 16000, +}; + +#define LM3532_MAX_CHANNELS 3 +#define LM3631_MAX_CHANNELS 2 +#define LM3632_MAX_CHANNELS 2 +#define LM3633_MAX_CHANNELS 3 +#define LM3695_MAX_CHANNELS 2 +#define LM3697_MAX_CHANNELS 3 + +const struct ti_lmu_bl_cfg lmu_bl_cfg[LMU_MAX_ID] = { + { + .reginfo = &lm3532_reg_info, + .num_channels = LM3532_MAX_CHANNELS, + .max_brightness = MAX_BRIGHTNESS_8BIT, + .pwm_action = UPDATE_PWM_AND_BRT_REGISTER, + .ramp_table = lm3532_ramp_table, + .size_ramp = ARRAY_SIZE(lm3532_ramp_table), + }, + { + .reginfo = &lm3631_reg_info, + .num_channels = LM3631_MAX_CHANNELS, + .max_brightness = MAX_BRIGHTNESS_11BIT, + .pwm_action = UPDATE_PWM_ONLY, + .ramp_table = lm3631_ramp_table, + .size_ramp = ARRAY_SIZE(lm3631_ramp_table), + }, + { + .reginfo = &lm3632_reg_info, + .num_channels = LM3632_MAX_CHANNELS, + .max_brightness = MAX_BRIGHTNESS_11BIT, + .pwm_action = UPDATE_PWM_ONLY, + }, + { + .reginfo = &lm3633_reg_info, + .num_channels = LM3633_MAX_CHANNELS, + .max_brightness = MAX_BRIGHTNESS_11BIT, + .pwm_action = UPDATE_MAX_BRT, + .ramp_table = common_ramp_table, + .size_ramp = ARRAY_SIZE(common_ramp_table), + .fault_monitor_used = true, + }, + { + .reginfo = &lm3695_reg_info, + .num_channels = LM3695_MAX_CHANNELS, + .max_brightness = MAX_BRIGHTNESS_11BIT, + .pwm_action = UPDATE_PWM_AND_BRT_REGISTER, + }, + { + .reginfo = &lm3697_reg_info, + .num_channels = LM3697_MAX_CHANNELS, + .max_brightness = MAX_BRIGHTNESS_11BIT, + .pwm_action = UPDATE_PWM_AND_BRT_REGISTER, + .ramp_table = common_ramp_table, + .size_ramp = ARRAY_SIZE(common_ramp_table), + .fault_monitor_used = true, + }, +}; diff --git a/drivers/video/backlight/ti-lmu-backlight-data.h b/drivers/video/backlight/ti-lmu-backlight-data.h new file mode 100644 index 000000000000..c64e8e6513e1 --- /dev/null +++ b/drivers/video/backlight/ti-lmu-backlight-data.h @@ -0,0 +1,95 @@ +/* + * TI LMU (Lighting Management Unit) Backlight Device Data Definitions + * + * Copyright 2015 Texas Instruments + * + * Author: Milo Kim + * + * 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. + */ + +#ifndef __TI_LMU_BACKLIGHT_H__ +#define __TI_LMU_BACKLIGHT_H__ + +#include +#include + +#define MAX_BRIGHTNESS_8BIT 255 +#define MAX_BRIGHTNESS_11BIT 2047 + +enum ti_lmu_bl_pwm_action { + /* Update PWM duty, no brightness register update is required */ + UPDATE_PWM_ONLY, + /* Update not only duty but also brightness register */ + UPDATE_PWM_AND_BRT_REGISTER, + /* Update max value in brightness registers */ + UPDATE_MAX_BRT, +}; + +struct lmu_bl_reg_data { + u8 reg; + u8 mask; + u8 val; +}; + +/** + * struct ti_lmu_bl_reg + * + * @init: Device initialization registers + * @num_init: Numbers of initialization registers + * @channel: Backlight channel configuration registers + * @mode: Brightness control mode registers + * @ramp: Ramp registers for lighting effect + * @ramp_reg_offset: Ramp register offset. + * Only used for multiple ramp registers. + * @enable: Enable control register address + * @enable_usec: Delay time for updating enable register. + * Unit is microsecond. + * @brightness_msb: Brightness MSB(Upper 8 bits) registers. + * Concatenated with LSB in 11 bit dimming mode. + * In 8 bit dimming, only MSB is used. + * @brightness_lsb: Brightness LSB(Lower 3 bits) registers. + * Only valid in 11 bit dimming mode. + */ +struct ti_lmu_bl_reg { + const struct lmu_bl_reg_data *init; + int num_init; + const struct lmu_bl_reg_data *channel; + const struct lmu_bl_reg_data *mode; + const struct lmu_bl_reg_data *ramp; + int ramp_reg_offset; + u8 *enable; + unsigned long enable_usec; + u8 *brightness_msb; + u8 *brightness_lsb; +}; + +/** + * struct ti_lmu_bl_cfg + * + * @reginfo: Device register configuration + * @num_channels: Number of backlight channels + * @max_brightness: Max brightness value of backlight device + * @pwm_action: How to control brightness registers in PWM mode + * @ramp_table: [Optional] Ramp time table for lighting effect. + * It's used for searching approximate register index. + * @size_ramp: [Optional] Size of ramp table + * @fault_monitor_used: [Optional] Set true if the device needs to handle + * LMU fault monitor event. + * + * This structure is used for device specific data configuration. + */ +struct ti_lmu_bl_cfg { + const struct ti_lmu_bl_reg *reginfo; + int num_channels; + int max_brightness; + enum ti_lmu_bl_pwm_action pwm_action; + int *ramp_table; + int size_ramp; + bool fault_monitor_used; +}; + +extern const struct ti_lmu_bl_cfg lmu_bl_cfg[LMU_MAX_ID]; +#endif