diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/mfd/lm3533-core.c | 648 |
1 files changed, 648 insertions, 0 deletions
diff --git a/drivers/mfd/lm3533-core.c b/drivers/mfd/lm3533-core.c new file mode 100644 index 000000000..be32ffc5a --- /dev/null +++ b/drivers/mfd/lm3533-core.c @@ -0,0 +1,648 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * lm3533-core.c -- LM3533 Core + * + * Copyright (C) 2011-2012 Texas Instruments + * + * Author: Johan Hovold <jhovold@gmail.com> + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/mfd/core.h> +#include <linux/regmap.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/uaccess.h> + +#include <linux/mfd/lm3533.h> + + +#define LM3533_BOOST_OVP_MASK 0x06 +#define LM3533_BOOST_OVP_SHIFT 1 + +#define LM3533_BOOST_FREQ_MASK 0x01 +#define LM3533_BOOST_FREQ_SHIFT 0 + +#define LM3533_BL_ID_MASK 1 +#define LM3533_LED_ID_MASK 3 +#define LM3533_BL_ID_MAX 1 +#define LM3533_LED_ID_MAX 3 + +#define LM3533_HVLED_ID_MAX 2 +#define LM3533_LVLED_ID_MAX 5 + +#define LM3533_REG_OUTPUT_CONF1 0x10 +#define LM3533_REG_OUTPUT_CONF2 0x11 +#define LM3533_REG_BOOST_PWM 0x2c + +#define LM3533_REG_MAX 0xb2 + + +static struct mfd_cell lm3533_als_devs[] = { + { + .name = "lm3533-als", + .id = -1, + }, +}; + +static struct mfd_cell lm3533_bl_devs[] = { + { + .name = "lm3533-backlight", + .id = 0, + }, + { + .name = "lm3533-backlight", + .id = 1, + }, +}; + +static struct mfd_cell lm3533_led_devs[] = { + { + .name = "lm3533-leds", + .id = 0, + }, + { + .name = "lm3533-leds", + .id = 1, + }, + { + .name = "lm3533-leds", + .id = 2, + }, + { + .name = "lm3533-leds", + .id = 3, + }, +}; + +int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val) +{ + int tmp; + int ret; + + ret = regmap_read(lm3533->regmap, reg, &tmp); + if (ret < 0) { + dev_err(lm3533->dev, "failed to read register %02x: %d\n", + reg, ret); + return ret; + } + + *val = tmp; + + dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val); + + return ret; +} +EXPORT_SYMBOL_GPL(lm3533_read); + +int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val) +{ + int ret; + + dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val); + + ret = regmap_write(lm3533->regmap, reg, val); + if (ret < 0) { + dev_err(lm3533->dev, "failed to write register %02x: %d\n", + reg, ret); + } + + return ret; +} +EXPORT_SYMBOL_GPL(lm3533_write); + +int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask) +{ + int ret; + + dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask); + + ret = regmap_update_bits(lm3533->regmap, reg, mask, val); + if (ret < 0) { + dev_err(lm3533->dev, "failed to update register %02x: %d\n", + reg, ret); + } + + return ret; +} +EXPORT_SYMBOL_GPL(lm3533_update); + +static int lm3533_set_boost_freq(struct lm3533 *lm3533, + enum lm3533_boost_freq freq) +{ + int ret; + + ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM, + freq << LM3533_BOOST_FREQ_SHIFT, + LM3533_BOOST_FREQ_MASK); + if (ret) + dev_err(lm3533->dev, "failed to set boost frequency\n"); + + return ret; +} + + +static int lm3533_set_boost_ovp(struct lm3533 *lm3533, + enum lm3533_boost_ovp ovp) +{ + int ret; + + ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM, + ovp << LM3533_BOOST_OVP_SHIFT, + LM3533_BOOST_OVP_MASK); + if (ret) + dev_err(lm3533->dev, "failed to set boost ovp\n"); + + return ret; +} + +/* + * HVLED output config -- output hvled controlled by backlight bl + */ +static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl) +{ + u8 val; + u8 mask; + int shift; + int ret; + + if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX) + return -EINVAL; + + if (bl > LM3533_BL_ID_MAX) + return -EINVAL; + + shift = hvled - 1; + mask = LM3533_BL_ID_MASK << shift; + val = bl << shift; + + ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask); + if (ret) + dev_err(lm3533->dev, "failed to set hvled config\n"); + + return ret; +} + +/* + * LVLED output config -- output lvled controlled by LED led + */ +static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led) +{ + u8 reg; + u8 val; + u8 mask; + int shift; + int ret; + + if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX) + return -EINVAL; + + if (led > LM3533_LED_ID_MAX) + return -EINVAL; + + if (lvled < 4) { + reg = LM3533_REG_OUTPUT_CONF1; + shift = 2 * lvled; + } else { + reg = LM3533_REG_OUTPUT_CONF2; + shift = 2 * (lvled - 4); + } + + mask = LM3533_LED_ID_MASK << shift; + val = led << shift; + + ret = lm3533_update(lm3533, reg, val, mask); + if (ret) + dev_err(lm3533->dev, "failed to set lvled config\n"); + + return ret; +} + +static void lm3533_enable(struct lm3533 *lm3533) +{ + if (gpio_is_valid(lm3533->gpio_hwen)) + gpio_set_value(lm3533->gpio_hwen, 1); +} + +static void lm3533_disable(struct lm3533 *lm3533) +{ + if (gpio_is_valid(lm3533->gpio_hwen)) + gpio_set_value(lm3533->gpio_hwen, 0); +} + +enum lm3533_attribute_type { + LM3533_ATTR_TYPE_BACKLIGHT, + LM3533_ATTR_TYPE_LED, +}; + +struct lm3533_device_attribute { + struct device_attribute dev_attr; + enum lm3533_attribute_type type; + union { + struct { + u8 id; + } output; + } u; +}; + +#define to_lm3533_dev_attr(_attr) \ + container_of(_attr, struct lm3533_device_attribute, dev_attr) + +static ssize_t show_output(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm3533 *lm3533 = dev_get_drvdata(dev); + struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr); + int id = lattr->u.output.id; + u8 reg; + u8 val; + u8 mask; + int shift; + int ret; + + if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) { + reg = LM3533_REG_OUTPUT_CONF1; + shift = id - 1; + mask = LM3533_BL_ID_MASK << shift; + } else { + if (id < 4) { + reg = LM3533_REG_OUTPUT_CONF1; + shift = 2 * id; + } else { + reg = LM3533_REG_OUTPUT_CONF2; + shift = 2 * (id - 4); + } + mask = LM3533_LED_ID_MASK << shift; + } + + ret = lm3533_read(lm3533, reg, &val); + if (ret) + return ret; + + val = (val & mask) >> shift; + + return scnprintf(buf, PAGE_SIZE, "%u\n", val); +} + +static ssize_t store_output(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct lm3533 *lm3533 = dev_get_drvdata(dev); + struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr); + int id = lattr->u.output.id; + u8 val; + int ret; + + if (kstrtou8(buf, 0, &val)) + return -EINVAL; + + if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) + ret = lm3533_set_hvled_config(lm3533, id, val); + else + ret = lm3533_set_lvled_config(lm3533, id, val); + + if (ret) + return ret; + + return len; +} + +#define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \ + struct lm3533_device_attribute lm3533_dev_attr_##_name = \ + { .dev_attr = __ATTR(_name, _mode, _show, _store), \ + .type = _type, \ + .u.output = { .id = _id }, } + +#define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \ + LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \ + show_output, store_output, _type, _id) + +#define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \ + LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr) +#define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \ + LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr) +/* + * Output config: + * + * output_hvled<nr> 0-1 + * output_lvled<nr> 0-3 + */ +static LM3533_OUTPUT_HVLED_ATTR_RW(1); +static LM3533_OUTPUT_HVLED_ATTR_RW(2); +static LM3533_OUTPUT_LVLED_ATTR_RW(1); +static LM3533_OUTPUT_LVLED_ATTR_RW(2); +static LM3533_OUTPUT_LVLED_ATTR_RW(3); +static LM3533_OUTPUT_LVLED_ATTR_RW(4); +static LM3533_OUTPUT_LVLED_ATTR_RW(5); + +static struct attribute *lm3533_attributes[] = { + &lm3533_dev_attr_output_hvled1.dev_attr.attr, + &lm3533_dev_attr_output_hvled2.dev_attr.attr, + &lm3533_dev_attr_output_lvled1.dev_attr.attr, + &lm3533_dev_attr_output_lvled2.dev_attr.attr, + &lm3533_dev_attr_output_lvled3.dev_attr.attr, + &lm3533_dev_attr_output_lvled4.dev_attr.attr, + &lm3533_dev_attr_output_lvled5.dev_attr.attr, + NULL, +}; + +#define to_dev_attr(_attr) \ + container_of(_attr, struct device_attribute, attr) + +static umode_t lm3533_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct lm3533 *lm3533 = dev_get_drvdata(dev); + struct device_attribute *dattr = to_dev_attr(attr); + struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr); + enum lm3533_attribute_type type = lattr->type; + umode_t mode = attr->mode; + + if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT) + mode = 0; + else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED) + mode = 0; + + return mode; +}; + +static struct attribute_group lm3533_attribute_group = { + .is_visible = lm3533_attr_is_visible, + .attrs = lm3533_attributes +}; + +static int lm3533_device_als_init(struct lm3533 *lm3533) +{ + struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); + int ret; + + if (!pdata->als) + return 0; + + lm3533_als_devs[0].platform_data = pdata->als; + lm3533_als_devs[0].pdata_size = sizeof(*pdata->als); + + ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL, + 0, NULL); + if (ret) { + dev_err(lm3533->dev, "failed to add ALS device\n"); + return ret; + } + + lm3533->have_als = 1; + + return 0; +} + +static int lm3533_device_bl_init(struct lm3533 *lm3533) +{ + struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); + int i; + int ret; + + if (!pdata->backlights || pdata->num_backlights == 0) + return 0; + + if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs)) + pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs); + + for (i = 0; i < pdata->num_backlights; ++i) { + lm3533_bl_devs[i].platform_data = &pdata->backlights[i]; + lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]); + } + + ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs, + pdata->num_backlights, NULL, 0, NULL); + if (ret) { + dev_err(lm3533->dev, "failed to add backlight devices\n"); + return ret; + } + + lm3533->have_backlights = 1; + + return 0; +} + +static int lm3533_device_led_init(struct lm3533 *lm3533) +{ + struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); + int i; + int ret; + + if (!pdata->leds || pdata->num_leds == 0) + return 0; + + if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs)) + pdata->num_leds = ARRAY_SIZE(lm3533_led_devs); + + for (i = 0; i < pdata->num_leds; ++i) { + lm3533_led_devs[i].platform_data = &pdata->leds[i]; + lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]); + } + + ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs, + pdata->num_leds, NULL, 0, NULL); + if (ret) { + dev_err(lm3533->dev, "failed to add LED devices\n"); + return ret; + } + + lm3533->have_leds = 1; + + return 0; +} + +static int lm3533_device_setup(struct lm3533 *lm3533, + struct lm3533_platform_data *pdata) +{ + int ret; + + ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq); + if (ret) + return ret; + + return lm3533_set_boost_ovp(lm3533, pdata->boost_ovp); +} + +static int lm3533_device_init(struct lm3533 *lm3533) +{ + struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); + int ret; + + dev_dbg(lm3533->dev, "%s\n", __func__); + + if (!pdata) { + dev_err(lm3533->dev, "no platform data\n"); + return -EINVAL; + } + + lm3533->gpio_hwen = pdata->gpio_hwen; + + dev_set_drvdata(lm3533->dev, lm3533); + + if (gpio_is_valid(lm3533->gpio_hwen)) { + ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen, + GPIOF_OUT_INIT_LOW, "lm3533-hwen"); + if (ret < 0) { + dev_err(lm3533->dev, + "failed to request HWEN GPIO %d\n", + lm3533->gpio_hwen); + return ret; + } + } + + lm3533_enable(lm3533); + + ret = lm3533_device_setup(lm3533, pdata); + if (ret) + goto err_disable; + + lm3533_device_als_init(lm3533); + lm3533_device_bl_init(lm3533); + lm3533_device_led_init(lm3533); + + ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group); + if (ret < 0) { + dev_err(lm3533->dev, "failed to create sysfs attributes\n"); + goto err_unregister; + } + + return 0; + +err_unregister: + mfd_remove_devices(lm3533->dev); +err_disable: + lm3533_disable(lm3533); + + return ret; +} + +static void lm3533_device_exit(struct lm3533 *lm3533) +{ + dev_dbg(lm3533->dev, "%s\n", __func__); + + sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group); + + mfd_remove_devices(lm3533->dev); + lm3533_disable(lm3533); +} + +static bool lm3533_readable_register(struct device *dev, unsigned int reg) +{ + switch (reg) { + case 0x10 ... 0x2c: + case 0x30 ... 0x38: + case 0x40 ... 0x45: + case 0x50 ... 0x57: + case 0x60 ... 0x6e: + case 0x70 ... 0x75: + case 0x80 ... 0x85: + case 0x90 ... 0x95: + case 0xa0 ... 0xa5: + case 0xb0 ... 0xb2: + return true; + default: + return false; + } +} + +static bool lm3533_volatile_register(struct device *dev, unsigned int reg) +{ + switch (reg) { + case 0x34 ... 0x36: /* zone */ + case 0x37 ... 0x38: /* adc */ + case 0xb0 ... 0xb1: /* fault */ + return true; + default: + return false; + } +} + +static bool lm3533_precious_register(struct device *dev, unsigned int reg) +{ + switch (reg) { + case 0x34: /* zone */ + return true; + default: + return false; + } +} + +static const struct regmap_config regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = LM3533_REG_MAX, + .readable_reg = lm3533_readable_register, + .volatile_reg = lm3533_volatile_register, + .precious_reg = lm3533_precious_register, +}; + +static int lm3533_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct lm3533 *lm3533; + + dev_dbg(&i2c->dev, "%s\n", __func__); + + lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL); + if (!lm3533) + return -ENOMEM; + + i2c_set_clientdata(i2c, lm3533); + + lm3533->regmap = devm_regmap_init_i2c(i2c, ®map_config); + if (IS_ERR(lm3533->regmap)) + return PTR_ERR(lm3533->regmap); + + lm3533->dev = &i2c->dev; + lm3533->irq = i2c->irq; + + return lm3533_device_init(lm3533); +} + +static void lm3533_i2c_remove(struct i2c_client *i2c) +{ + struct lm3533 *lm3533 = i2c_get_clientdata(i2c); + + dev_dbg(&i2c->dev, "%s\n", __func__); + + lm3533_device_exit(lm3533); +} + +static const struct i2c_device_id lm3533_i2c_ids[] = { + { "lm3533", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids); + +static struct i2c_driver lm3533_i2c_driver = { + .driver = { + .name = "lm3533", + }, + .id_table = lm3533_i2c_ids, + .probe = lm3533_i2c_probe, + .remove = lm3533_i2c_remove, +}; + +static int __init lm3533_i2c_init(void) +{ + return i2c_add_driver(&lm3533_i2c_driver); +} +subsys_initcall(lm3533_i2c_init); + +static void __exit lm3533_i2c_exit(void) +{ + i2c_del_driver(&lm3533_i2c_driver); +} +module_exit(lm3533_i2c_exit); + +MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); +MODULE_DESCRIPTION("LM3533 Core"); +MODULE_LICENSE("GPL"); |