--- /dev/null
+/*
+ * ROHM Semiconductor BD6107 LED Driver
+ *
+ * Copyright (C) 2013 Ideas on board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * 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 <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/platform_data/bd6107.h>
+#include <linux/slab.h>
+
+#define BD6107_PSCNT1 0x00
+#define BD6107_PSCNT1_PSCNTREG2 (1 << 2)
+#define BD6107_PSCNT1_PSCNTREG1 (1 << 0)
+#define BD6107_REGVSET 0x02
+#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2)
+#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2)
+#define BD6107_LEDCNT1 0x03
+#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1)
+#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0)
+#define BD6107_PORTSEL 0x04
+#define BD6107_PORTSEL_LEDM(n) (1 << (n))
+#define BD6107_RGB1CNT1 0x05
+#define BD6107_RGB1CNT2 0x06
+#define BD6107_RGB1CNT3 0x07
+#define BD6107_RGB1CNT4 0x08
+#define BD6107_RGB1CNT5 0x09
+#define BD6107_RGB1FLM 0x0a
+#define BD6107_RGB2CNT1 0x0b
+#define BD6107_RGB2CNT2 0x0c
+#define BD6107_RGB2CNT3 0x0d
+#define BD6107_RGB2CNT4 0x0e
+#define BD6107_RGB2CNT5 0x0f
+#define BD6107_RGB2FLM 0x10
+#define BD6107_PSCONT3 0x11
+#define BD6107_SMMONCNT 0x12
+#define BD6107_DCDCCNT 0x13
+#define BD6107_IOSEL 0x14
+#define BD6107_OUT1 0x15
+#define BD6107_OUT2 0x16
+#define BD6107_MASK1 0x17
+#define BD6107_MASK2 0x18
+#define BD6107_FACTOR1 0x19
+#define BD6107_FACTOR2 0x1a
+#define BD6107_CLRFACT1 0x1b
+#define BD6107_CLRFACT2 0x1c
+#define BD6107_STATE1 0x1d
+#define BD6107_LSIVER 0x1e
+#define BD6107_GRPSEL 0x1f
+#define BD6107_LEDCNT2 0x20
+#define BD6107_LEDCNT3 0x21
+#define BD6107_MCURRENT 0x22
+#define BD6107_MAINCNT1 0x23
+#define BD6107_MAINCNT2 0x24
+#define BD6107_SLOPECNT 0x25
+#define BD6107_MSLOPE 0x26
+#define BD6107_RGBSLOPE 0x27
+#define BD6107_TEST 0x29
+#define BD6107_SFTRST 0x2a
+#define BD6107_SFTRSTGD 0x2b
+
+struct bd6107 {
+ struct i2c_client *client;
+ struct backlight_device *backlight;
+ struct bd6107_platform_data *pdata;
+};
+
+static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data)
+{
+ return i2c_smbus_write_byte_data(bd->client, reg, data);
+}
+
+static int bd6107_backlight_update_status(struct backlight_device *backlight)
+{
+ struct bd6107 *bd = bl_get_data(backlight);
+ int brightness = backlight->props.brightness;
+
+ if (backlight->props.power != FB_BLANK_UNBLANK ||
+ backlight->props.fb_blank != FB_BLANK_UNBLANK ||
+ backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+ brightness = 0;
+
+ if (brightness) {
+ bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) |
+ BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0));
+ bd6107_write(bd, BD6107_MAINCNT1, brightness);
+ bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1);
+ } else {
+ gpio_set_value(bd->pdata->reset, 0);
+ msleep(24);
+ gpio_set_value(bd->pdata->reset, 1);
+ }
+
+ return 0;
+}
+
+static int bd6107_backlight_check_fb(struct backlight_device *backlight,
+ struct fb_info *info)
+{
+ struct bd6107 *bd = bl_get_data(backlight);
+
+ return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev;
+}
+
+static const struct backlight_ops bd6107_backlight_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = bd6107_backlight_update_status,
+ .check_fb = bd6107_backlight_check_fb,
+};
+
+static int bd6107_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct backlight_device *backlight;
+ struct backlight_properties props;
+ struct bd6107 *bd;
+ int ret;
+
+ if (pdata == NULL || !pdata->reset) {
+ dev_err(&client->dev, "No reset GPIO in platform data\n");
+ return -EINVAL;
+ }
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_warn(&client->dev,
+ "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
+ return -EIO;
+ }
+
+ bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
+ if (!bd)
+ return -ENOMEM;
+
+ bd->client = client;
+ bd->pdata = pdata;
+
+ ret = devm_gpio_request_one(&client->dev, pdata->reset,
+ GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset");
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to request reset GPIO\n");
+ return ret;
+ }
+
+ memset(&props, 0, sizeof(props));
+ props.type = BACKLIGHT_RAW;
+ props.max_brightness = 128;
+ props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
+ props.max_brightness);
+
+ backlight = devm_backlight_device_register(&client->dev,
+ dev_name(&client->dev),
+ &bd->client->dev, bd,
+ &bd6107_backlight_ops, &props);
+ if (IS_ERR(backlight)) {
+ dev_err(&client->dev, "failed to register backlight\n");
+ return PTR_ERR(backlight);
+ }
+
+ backlight_update_status(backlight);
+ i2c_set_clientdata(client, backlight);
+
+ return 0;
+}
+
+static int bd6107_remove(struct i2c_client *client)
+{
+ struct backlight_device *backlight = i2c_get_clientdata(client);
+
+ backlight->props.brightness = 0;
+ backlight_update_status(backlight);
+
+ return 0;
+}
+
+static const struct i2c_device_id bd6107_ids[] = {
+ { "bd6107", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, bd6107_ids);
+
+static struct i2c_driver bd6107_driver = {
+ .driver = {
+ .name = "bd6107",
+ },
+ .probe = bd6107_probe,
+ .remove = bd6107_remove,
+ .id_table = bd6107_ids,
+};
+
+module_i2c_driver(bd6107_driver);
+
+MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff