Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754187AbcKJIMD (ORCPT ); Thu, 10 Nov 2016 03:12:03 -0500 Received: from mail-wm0-f45.google.com ([74.125.82.45]:36940 "EHLO mail-wm0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751582AbcKJIMB (ORCPT ); Thu, 10 Nov 2016 03:12:01 -0500 Date: Thu, 10 Nov 2016 08:14:47 +0000 From: Lee Jones To: Olimpiu Dejeu Cc: robh@kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, devicetree@vger.kernel.org, jingoohan1@gmail.com Subject: Re: [PATCH 1/2] backlight: arcxcnn: add support for ArticSand devices Message-ID: <20161110081447.GN13127@dell> References: <1477513778-31297-1-git-send-email-olimpiu@arcticsand.com> <20161109155307.GH13127@dell> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20161109155307.GH13127@dell> User-Agent: Mutt/1.6.2 (2016-07-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 21973 Lines: 680 On Wed, 09 Nov 2016, Lee Jones wrote: > Jingoo? Ah, it looks like you used the wrong address. I should have been: jingoohan1@gmail.com I'll CC him from here. > On Wed, 26 Oct 2016, Olimpiu Dejeu wrote: > > > Resubmition of arcxcnn backliught driver adding devicetree entries > > for all registers > > > > Signed-off-by: Olimpiu Dejeu > > > > --- > > drivers/video/backlight/Kconfig | 7 + > > drivers/video/backlight/Makefile | 1 + > > drivers/video/backlight/arcxcnn_bl.c | 541 +++++++++++++++++++++++++++++++++++ > > include/linux/i2c/arcxcnn.h | 67 +++++ > > 4 files changed, 616 insertions(+) > > create mode 100644 drivers/video/backlight/arcxcnn_bl.c > > create mode 100644 include/linux/i2c/arcxcnn.h > > > > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig > > index 5ffa4b4..4e1d2ad 100644 > > --- a/drivers/video/backlight/Kconfig > > +++ b/drivers/video/backlight/Kconfig > > @@ -460,6 +460,13 @@ config BACKLIGHT_BD6107 > > help > > If you have a Rohm BD6107 say Y to enable the backlight driver. > > > > +config BACKLIGHT_ARCXCNN > > + tristate "Backlight driver for the Arctic Sands ARCxCnnnn family" > > + depends on I2C > > + help > > + If you have an ARCxCnnnn family backlight say Y to enable > > + the backlight driver. > > + > > endif # BACKLIGHT_CLASS_DEVICE > > > > endif # BACKLIGHT_LCD_SUPPORT > > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile > > index 16ec534..8905129 100644 > > --- a/drivers/video/backlight/Makefile > > +++ b/drivers/video/backlight/Makefile > > @@ -55,3 +55,4 @@ obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o > > obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o > > obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o > > obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o > > +obj-$(CONFIG_BACKLIGHT_ARCXCNN) += arcxcnn_bl.o > > diff --git a/drivers/video/backlight/arcxcnn_bl.c b/drivers/video/backlight/arcxcnn_bl.c > > new file mode 100644 > > index 0000000..1dad680 > > --- /dev/null > > +++ b/drivers/video/backlight/arcxcnn_bl.c > > @@ -0,0 +1,541 @@ > > +/* > > + * Backlight driver for ArcticSand ARC_X_C_0N_0N Devices > > + * > > + * Copyright 2016 ArcticSand, Inc. > > + * > > + * Licensed under the GPL-2 or later. > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include "linux/i2c/arcxcnn.h" > > + > > +#define ARCXCNN_CMD (0x00) /* Command Register */ > > +#define ARCXCNN_CMD_STDBY (0x80) /* I2C Standby */ > > +#define ARCXCNN_CMD_RESET (0x40) /* Reset */ > > +#define ARCXCNN_CMD_BOOST (0x10) /* Boost */ > > +#define ARCXCNN_CMD_OVP_MASK (0x0C) /* --- Over Voltage Threshold */ > > +#define ARCXCNN_CMD_OVP_XXV (0x0C) /* Over Voltage Threshold */ > > +#define ARCXCNN_CMD_OVP_20V (0x08) /* 20v Over Voltage Threshold */ > > +#define ARCXCNN_CMD_OVP_24V (0x04) /* 24v Over Voltage Threshold */ > > +#define ARCXCNN_CMD_OVP_31V (0x00) /* 31.4v Over Voltage Threshold */ > > +#define ARCXCNN_CMD_EXT_COMP (0x01) /* part (0) or full (1) external comp */ > > + > > +#define ARCXCNN_CONFIG (0x01) /* Configuration */ > > +#define ARCXCNN_STATUS1 (0x02) /* Status 1 */ > > +#define ARCXCNN_STATUS2 (0x03) /* Status 2 */ > > +#define ARCXCNN_FADECTRL (0x04) /* Fading Control */ > > +#define ARCXCNN_ILED_CONFIG (0x05) /* ILED Configuration */ > > + > > +#define ARCXCNN_LEDEN (0x06) /* LED Enable Register */ > > +#define ARCXCNN_LEDEN_ISETEXT (0x80) /* Full-scale current set externally */ > > +#define ARCXCNN_LEDEN_MASK (0x3F) /* LED string enables */ > > +#define ARCXCNN_LEDEN_LED1 (0x01) > > +#define ARCXCNN_LEDEN_LED2 (0x02) > > +#define ARCXCNN_LEDEN_LED3 (0x04) > > +#define ARCXCNN_LEDEN_LED4 (0x08) > > +#define ARCXCNN_LEDEN_LED5 (0x10) > > +#define ARCXCNN_LEDEN_LED6 (0x20) > > + > > +#define ARCXCNN_WLED_ISET_LSB (0x07) /* LED ISET LSB (in upper nibble) */ > > +#define ARCXCNN_WLED_ISET_MSB (0x08) /* LED ISET MSB (8 bits) */ > > + > > +#define ARCXCNN_DIMFREQ (0x09) > > +#define ARCXCNN_COMP_CONFIG (0x0A) > > +#define ARCXCNN_FILT_CONFIG (0x0B) > > +#define ARCXCNN_IMAXTUNE (0x0C) > > + > > +#define DEFAULT_BL_NAME "arctic_bl" > > +#define MAX_BRIGHTNESS 4095 > > + > > +static int s_no_reset_on_remove; > > +module_param_named(noreset, s_no_reset_on_remove, int, 0644); > > +MODULE_PARM_DESC(noreset, "No reset on module removal"); > > + > > +static int s_ibright = 60; > > +module_param_named(ibright, s_ibright, int, 0644); > > +MODULE_PARM_DESC(ibright, "Initial brightness (when no plat data)"); > > + > > +static int s_iledstr = 0x3F; > > +module_param_named(iledstr, s_iledstr, int, 0644); > > +MODULE_PARM_DESC(iledstr, "Initial LED String (when no plat data)"); > > + > > +static int s_retries = 2; /* 1 == only one try */ > > +module_param_named(retries, s_retries, int, 0644); > > +MODULE_PARM_DESC(retries, "I2C retries attempted"); > > + > > +enum arcxcnn_brightness_ctrl_mode { > > + PWM_BASED = 1, > > + REGISTER_BASED, > > +}; > > + > > +struct arcxcnn; > > + > > +struct arcxcnn { > > + char chipname[64]; > > + enum arcxcnn_chip_id chip_id; > > + enum arcxcnn_brightness_ctrl_mode mode; > > + struct i2c_client *client; > > + struct backlight_device *bl; > > + struct device *dev; > > + struct arcxcnn_platform_data *pdata; > > + struct pwm_device *pwm; > > + struct regulator *supply; /* regulator for VDD input */ > > +}; > > + > > +static int arcxcnn_write_byte(struct arcxcnn *lp, u8 reg, u8 data) > > +{ > > + s32 ret = -1; > > + int att; > > + > > + for (att = 0; att < s_retries; att++) { > > + ret = i2c_smbus_write_byte_data(lp->client, reg, data); > > + if (ret >= 0) > > + return 0; > > + } > > + return ret; > > +} > > + > > +static u8 arcxcnn_read_byte(struct arcxcnn *lp, u8 reg) > > +{ > > + int val; > > + int att; > > + > > + for (att = 0; att < s_retries; att++) { > > + val = i2c_smbus_read_byte_data(lp->client, reg); > > + if (val >= 0) > > + return (u8)val; > > + } > > + return 0; > > +} > > + > > +static int arcxcnn_update_bit(struct arcxcnn *lp, u8 reg, u8 mask, u8 data) > > +{ > > + int ret, att; > > + u8 tmp; > > + > > + for (att = 0, ret = -1; att < s_retries; att++) { > > + ret = i2c_smbus_read_byte_data(lp->client, reg); > > + if (ret >= 0) > > + break; > > + } > > + if (ret < 0) { > > + dev_err(lp->dev, "failed to read 0x%.2x\n", reg); > > + return ret; > > + } > > + > > + tmp = (u8)ret; > > + tmp &= ~mask; > > + tmp |= data & mask; > > + > > + return arcxcnn_write_byte(lp, reg, tmp); > > +} > > + > > +static int arcxcnn_set_brightness(struct arcxcnn *lp, u32 brightness) > > +{ > > + int ret; > > + u8 val; > > + > > + val = (brightness & 0xF) << 4; > > + ret = arcxcnn_write_byte(lp, ARCXCNN_WLED_ISET_LSB, val); > > + if (ret < 0) > > + return ret; > > + val = (brightness >> 4); > > + ret = arcxcnn_write_byte(lp, ARCXCNN_WLED_ISET_MSB, val); > > + return ret; > > +} > > + > > +static int arcxcnn_bl_update_status(struct backlight_device *bl) > > +{ > > + struct arcxcnn *lp = bl_get_data(bl); > > + u32 brightness = bl->props.brightness; > > + > > + if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) > > + brightness = 0; > > + > > + /* set brightness */ > > + if (lp->mode == PWM_BASED) > > + ; /* via pwm */ > > + else if (lp->mode == REGISTER_BASED) > > + arcxcnn_set_brightness(lp, brightness); > > + > > + /* set power-on/off/save modes */ > > + if (bl->props.power == 0) > > + /* take out of standby */ > > + arcxcnn_update_bit(lp, ARCXCNN_CMD, ARCXCNN_CMD_STDBY, 0); > > + else > > + /* 1-3 == power save, 4 = off > > + * place in low-power standby mode > > + */ > > + arcxcnn_update_bit(lp, ARCXCNN_CMD, > > + ARCXCNN_CMD_STDBY, ARCXCNN_CMD_STDBY); > > + return 0; > > +} > > + > > +static const struct backlight_ops arcxcnn_bl_ops = { > > + .options = BL_CORE_SUSPENDRESUME, > > + .update_status = arcxcnn_bl_update_status, > > +}; > > + > > +static int arcxcnn_backlight_register(struct arcxcnn *lp) > > +{ > > + struct backlight_device *bl; > > + struct backlight_properties props; > > + struct arcxcnn_platform_data *pdata = lp->pdata; > > + const char *name = pdata->name ? : DEFAULT_BL_NAME; > > + > > + memset(&props, 0, sizeof(props)); > > + props.type = BACKLIGHT_PLATFORM; > > + props.max_brightness = MAX_BRIGHTNESS; > > + > > + if (pdata->initial_brightness > props.max_brightness) > > + pdata->initial_brightness = props.max_brightness; > > + > > + props.brightness = pdata->initial_brightness; > > + > > + bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp, > > + &arcxcnn_bl_ops, &props); > > + if (IS_ERR(bl)) > > + return PTR_ERR(bl); > > + > > + lp->bl = bl; > > + > > + return 0; > > +} > > + > > +static ssize_t arcxcnn_get_chip_id(struct device *dev, > > + struct device_attribute *attr, char *buf) > > +{ > > + struct arcxcnn *lp = dev_get_drvdata(dev); > > + > > + return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname); > > +} > > + > > +static ssize_t arcxcnn_get_led_str(struct device *dev, > > + struct device_attribute *attr, char *buf) > > +{ > > + struct arcxcnn *lp = dev_get_drvdata(dev); > > + > > + return scnprintf(buf, PAGE_SIZE, "%02X\n", lp->pdata->led_str); > > +} > > + > > +static ssize_t arcxcnn_set_led_str(struct device *dev, > > + struct device_attribute *attr, const char *buf, size_t len) > > +{ > > + struct arcxcnn *lp = dev_get_drvdata(dev); > > + unsigned long ledstr; > > + > > + if (kstrtoul(buf, 0, &ledstr)) > > + return 0; > > + > > + if (ledstr != lp->pdata->led_str) { > > + /* don't allow 0 for ledstr, use power to turn all off */ > > + if (ledstr == 0) > > + return 0; > > + lp->pdata->led_str = ledstr & 0x3F; > > + arcxcnn_update_bit(lp, ARCXCNN_LEDEN, > > + ARCXCNN_LEDEN_MASK, lp->pdata->led_str); > > + } > > + return len; > > +} > > + > > +static ssize_t arcxcnn_get_bl_ctl_mode(struct device *dev, > > + struct device_attribute *attr, char *buf) > > +{ > > + struct arcxcnn *lp = dev_get_drvdata(dev); > > + char *strmode = NULL; > > + > > + if (lp->mode == PWM_BASED) > > + strmode = "pwm based"; > > + else if (lp->mode == REGISTER_BASED) > > + strmode = "register based"; > > + > > + return scnprintf(buf, PAGE_SIZE, "%s\n", strmode); > > +} > > + > > +static DEVICE_ATTR(chip_id, 0444, arcxcnn_get_chip_id, NULL); > > +static DEVICE_ATTR(led_str, 0664, arcxcnn_get_led_str, arcxcnn_set_led_str); > > +static DEVICE_ATTR(bl_ctl_mode, 0444, arcxcnn_get_bl_ctl_mode, NULL); > > + > > +static struct attribute *arcxcnn_attributes[] = { > > + &dev_attr_chip_id.attr, > > + &dev_attr_led_str.attr, > > + &dev_attr_bl_ctl_mode.attr, > > + NULL, > > +}; > > + > > +static const struct attribute_group arcxcnn_attr_group = { > > + .attrs = arcxcnn_attributes, > > +}; > > + > > +#ifdef CONFIG_OF > > +static int arcxcnn_parse_dt(struct arcxcnn *lp) > > +{ > > + struct device *dev = lp->dev; > > + struct device_node *node = dev->of_node; > > + u32 prog_val, num_entry, sources[6]; > > + int ret; > > + > > + if (!node) { > > + dev_err(dev, "no platform data.\n"); > > + return -EINVAL; > > + } > > + lp->pdata->led_config_0_set = false; > > + lp->pdata->led_config_1_set = false; > > + lp->pdata->dim_freq_set = false; > > + lp->pdata->comp_config_set = false; > > + lp->pdata->filter_config_set = false; > > + lp->pdata->trim_config_set = false; > > + > > + ret = of_property_read_string(node, "label", &lp->pdata->name); > > + if (ret < 0) > > + lp->pdata->name = NULL; > > + > > + ret = of_property_read_u32(node, "default-brightness", &prog_val); > > + if (ret < 0) > > + prog_val = s_ibright; > > + lp->pdata->initial_brightness = prog_val; > > + if (lp->pdata->initial_brightness > MAX_BRIGHTNESS) > > + lp->pdata->initial_brightness = MAX_BRIGHTNESS; > > + > > + ret = of_property_read_u32(node, "arcticsand,led-config-0", &prog_val); > > + if (ret == 0) { > > + lp->pdata->led_config_0 = (u8)prog_val; > > + lp->pdata->led_config_0_set = true; > > + } > > + ret = of_property_read_u32(node, "arcticsand,led-config-1", &prog_val); > > + if (ret == 0) { > > + lp->pdata->led_config_1 = (u8)prog_val; > > + lp->pdata->led_config_1_set = true; > > + } > > + ret = of_property_read_u32(node, "arcticsand,dim-freq", &prog_val); > > + if (ret == 0) { > > + lp->pdata->dim_freq = (u8)prog_val; > > + lp->pdata->dim_freq_set = true; > > + } > > + ret = of_property_read_u32(node, "arcticsand,comp-config", &prog_val); > > + if (ret == 0) { > > + lp->pdata->comp_config = (u8)prog_val; > > + lp->pdata->comp_config_set = true; > > + } > > + ret = of_property_read_u32(node, "arcticsand,filter-config", &prog_val); > > + if (ret == 0) { > > + lp->pdata->filter_config = (u8)prog_val; > > + lp->pdata->filter_config_set = true; > > + } > > + ret = of_property_read_u32(node, "arcticsand,trim-config", &prog_val); > > + if (ret == 0) { > > + lp->pdata->trim_config = (u8)prog_val; > > + lp->pdata->trim_config_set = true; > > + } > > + ret = of_property_count_u32_elems(node, "led-sources"); > > + if (ret < 0) > > + lp->pdata->led_str = 0x3F; > > + else { > > + num_entry = ret; > > + if (num_entry > 6) > > + num_entry = 6; > > + > > + ret = of_property_read_u32_array(node, "led-sources", sources, > > + num_entry); > > + if (ret < 0) { > > + dev_err(dev, "led-sources node is invalid.\n"); > > + return -EINVAL; > > + } > > + > > + lp->pdata->led_str = 0; > > + while (num_entry > 0) > > + lp->pdata->led_str |= (1 << sources[--num_entry]); > > + } > > + return 0; > > +} > > +#else > > +static int arcxcnn_parse_dt(struct arcxcnn *lp) > > +{ > > + return -EINVAL; > > +} > > +#endif > > + > > +static int arcxcnn_probe(struct i2c_client *cl, const struct i2c_device_id *id) > > +{ > > + struct arcxcnn *lp; > > + int ret; > > + u8 regval; > > + u16 chipid; > > + > > + if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) > > + return -EIO; > > + > > + lp = devm_kzalloc(&cl->dev, sizeof(*lp), GFP_KERNEL); > > + if (!lp) > > + return -ENOMEM; > > + > > + lp->client = cl; > > + lp->dev = &cl->dev; > > + lp->chip_id = id->driver_data; > > + lp->pdata = dev_get_platdata(&cl->dev); > > + > > + if (!lp->pdata) { > > + lp->pdata = devm_kzalloc(lp->dev, > > + sizeof(*lp->pdata), GFP_KERNEL); > > + if (!lp->pdata) > > + return -ENOMEM; > > + > > + /* no platform data, parse the device-tree for info. if there > > + * is no device tree entry, we are being told we exist because > > + * user-land said so, so make up the info we need > > + */ > > + ret = arcxcnn_parse_dt(lp); > > + if (ret < 0) { > > + /* no device tree, use defaults based on module params > > + */ > > + lp->pdata->led_config_0_set = false; > > + lp->pdata->led_config_1_set = false; > > + lp->pdata->dim_freq_set = false; > > + lp->pdata->comp_config_set = false; > > + lp->pdata->filter_config_set = false; > > + lp->pdata->trim_config_set = false; > > + > > + lp->pdata->name = NULL; > > + lp->pdata->initial_brightness = s_ibright; > > + lp->pdata->led_str = s_iledstr; > > + } > > + } > > + > > + if (lp->pdata->dim_freq_set) > > + lp->mode = PWM_BASED; > > + else > > + lp->mode = REGISTER_BASED; > > + > > + i2c_set_clientdata(cl, lp); > > + > > + /* read device ID */ > > + regval = arcxcnn_read_byte(lp, 0x1E); > > + chipid = regval; > > + chipid <<= 8; > > + regval = arcxcnn_read_byte(lp, 0x1F); > > + chipid |= regval; > > + > > + /* make sure it belongs to this driver > > + * TODO - handle specific ids > > + */ > > + if (chipid != 0x02A5) { > > + #if 1 > > + dev_info(&cl->dev, "Chip Id is %04X\n", chipid); > > + #else > > + dev_err(&cl->dev, "%04X is not ARC2C\n", chipid); > > + return -ENODEV; > > + #endif > > + } > > + /* reset the device */ > > + arcxcnn_write_byte(lp, ARCXCNN_CMD, ARCXCNN_CMD_RESET); > > + > > + /* set initial brightness */ > > + arcxcnn_set_brightness(lp, lp->pdata->initial_brightness); > > + > > + /* if fadectrl set in DT, set the value directly, else leave default */ > > + if (lp->pdata->led_config_0_set) > > + arcxcnn_write_byte(lp, ARCXCNN_FADECTRL, > > + lp->pdata->led_config_0); > > + > > + /* if iled config set in DT, set the value, else internal mode */ > > + if (lp->pdata->led_config_1_set) > > + arcxcnn_write_byte(lp, ARCXCNN_ILED_CONFIG, > > + lp->pdata->led_config_1); > > + else > > + arcxcnn_write_byte(lp, ARCXCNN_ILED_CONFIG, 0x57); > > + > > + /* other misc DT settings */ > > + if (lp->pdata->dim_freq_set) > > + arcxcnn_write_byte(lp, ARCXCNN_FADECTRL, lp->pdata->dim_freq); > > + if (lp->pdata->comp_config_set) > > + arcxcnn_write_byte(lp, ARCXCNN_COMP_CONFIG, > > + lp->pdata->comp_config); > > + if (lp->pdata->filter_config_set) > > + arcxcnn_write_byte(lp, ARCXCNN_FILT_CONFIG, > > + lp->pdata->filter_config); > > + if (lp->pdata->trim_config_set) > > + arcxcnn_write_byte(lp, ARCXCNN_IMAXTUNE, > > + lp->pdata->trim_config); > > + > > + /* set initial LED Strings */ > > + arcxcnn_update_bit(lp, ARCXCNN_LEDEN, > > + ARCXCNN_LEDEN_MASK, lp->pdata->led_str); > > + > > + snprintf(lp->chipname, sizeof(lp->chipname), > > + "%s-%04X", id->name, chipid); > > + > > + ret = arcxcnn_backlight_register(lp); > > + if (ret) { > > + dev_err(lp->dev, > > + "failed to register backlight. err: %d\n", ret); > > + return ret; > > + } > > + > > + ret = sysfs_create_group(&lp->dev->kobj, &arcxcnn_attr_group); > > + if (ret) { > > + dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret); > > + return ret; > > + } > > + > > + backlight_update_status(lp->bl); > > + return 0; > > +} > > + > > +static int arcxcnn_remove(struct i2c_client *cl) > > +{ > > + struct arcxcnn *lp = i2c_get_clientdata(cl); > > + > > + if (!s_no_reset_on_remove) { > > + /* disable all strings */ > > + arcxcnn_write_byte(lp, ARCXCNN_LEDEN, 0x00); > > + /* reset the device */ > > + arcxcnn_write_byte(lp, ARCXCNN_CMD, ARCXCNN_CMD_RESET); > > + } > > + lp->bl->props.brightness = 0; > > + backlight_update_status(lp->bl); > > + if (lp->supply) > > + regulator_disable(lp->supply); > > + sysfs_remove_group(&lp->dev->kobj, &arcxcnn_attr_group); > > + > > + return 0; > > +} > > + > > +static const struct of_device_id arcxcnn_dt_ids[] = { > > + { .compatible = "arc,arc2c0608" }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(of, arcxcnn_dt_ids); > > + > > +/* Note that the device/chip ID is not fixed in silicon so > > + * auto-probing of these devices on the bus is most likely > > + * not possible, use device tree to set i2c bus address > > + */ > > +static const struct i2c_device_id arcxcnn_ids[] = { > > + {"arc2c0608", ARC2C0608}, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(i2c, arcxcnn_ids); > > + > > +static struct i2c_driver arcxcnn_driver = { > > + .driver = { > > + .name = "arcxcnn_bl", > > + .of_match_table = of_match_ptr(arcxcnn_dt_ids), > > + }, > > + .probe = arcxcnn_probe, > > + .remove = arcxcnn_remove, > > + .id_table = arcxcnn_ids, > > +}; > > + > > +module_i2c_driver(arcxcnn_driver); > > + > > +MODULE_LICENSE("GPL v2"); > > +MODULE_AUTHOR("Brian Dodge "); > > +MODULE_DESCRIPTION("ARCXCNN Backlight driver"); > > diff --git a/include/linux/i2c/arcxcnn.h b/include/linux/i2c/arcxcnn.h > > new file mode 100644 > > index 0000000..1c681dd > > --- /dev/null > > +++ b/include/linux/i2c/arcxcnn.h > > @@ -0,0 +1,67 @@ > > +/* > > + * Backlight driver for ArcticSand ARC2C0608 Backlight Devices > > + * > > + * Copyright 2016 ArcticSand, Inc. > > + * > > + * Licensed under the GPL-2 or later. > > + */ > > + > > +#ifndef _ARCXCNN_H > > +#define _ARCXCNN_H > > + > > +enum arcxcnn_chip_id { > > + ARC2C0608 > > +}; > > + > > +enum arcxcnn_brightness_source { > > + ARCXCNN_PWM_ONLY, > > + ARCXCNN_I2C_ONLY = 2, > > +}; > > + > > +#define ARCXCNN_MAX_PROGENTRIES 48 /* max a/v pairs for custom */ > > + > > +/** > > + * struct arcxcnn_platform_data > > + * @name : Backlight driver name. If it is not defined, default name is set. > > + * @initial_brightness : initial value of backlight brightness > > + * @led_str : initial LED string enables, upper bit is global on/off > > + * @led_config_0 : fading speed (period between intensity steps) > > + * @led_config_1 : misc settings, see datasheet > > + * @dim_freq : pwm dimming frequency if in pwm mode > > + * @comp_config : misc config, see datasheet > > + * @filter_config: RC/PWM filter config, see datasheet > > + * @trim_config : full scale current trim, see datasheet > > + * @led_config_0_set : the value in led_config_0 is valid > > + * @led_config_1_set : the value in led_config_1 is valid > > + * @dim_freq_set : the value in dim_freq is valid > > + * @comp_config_set : the value in comp_config is valid > > + * @filter_config_set : the value in filter_config is valid > > + * @trim_config_set : the value in trim_config is valid > > + * > > + * the _set flags are used to indicate that the value was explicitly set > > + * in the device tree or platform data. settings not set are left as default > > + * power-on default values of the chip except for led_str and led_config_1 > > + * which are set by the driver (led_str is specified indirectly in the > > + * device tree via "led-sources") > > + */ > > +struct arcxcnn_platform_data { > > + const char *name; > > + u16 initial_brightness; > > + u8 led_str; > > + > > + u8 led_config_0; > > + u8 led_config_1; > > + u8 dim_freq; > > + u8 comp_config; > > + u8 filter_config; > > + u8 trim_config; > > + > > + bool led_config_0_set; > > + bool led_config_1_set; > > + bool dim_freq_set; > > + bool comp_config_set; > > + bool filter_config_set; > > + bool trim_config_set; > > +}; > > + > > +#endif > -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog