The UCS1002-2 provides a USB port power switch for precise control of up to 2.5 amperes continuous current with over-current limit (OCL), dynamic thermal management, latch or auto-recovery (low test current) fault handling, selectable active low or high enable, under- and over-voltage lockout, back-drive protection, and back-voltage protection. Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> --- Changes since v2: - Rename microchip,current-limit to microchip,limit-microamps (Rob Herring) Changes since v1: - Fix ERROR: info -> pdata is NULL but dereferenced (kbuild) - Change CONFIG_POWER_UCS1002 to CONFIG_UCS1002_POWER, seems more standard (Enric Balletbo) drivers/power/Kconfig | 7 + drivers/power/Makefile | 1 + drivers/power/ucs1002_power.c | 1004 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 1012 insertions(+) create mode 100644 drivers/power/ucs1002_power.c diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 1ddd13c..534e9db 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -502,6 +502,13 @@ config AXP20X_POWER This driver provides support for the power supply features of AXP20x PMIC. +config UCS1002_POWER + tristate "UCS1002-2 power supply driver" + select REGMAP_I2C + help + This driver provices support for UCS1002-2 Programmable USB Port + Power Controller. + endif # POWER_SUPPLY source "drivers/power/reset/Kconfig" diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 0e4eab5..936d2e1 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -73,3 +73,4 @@ obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o obj-$(CONFIG_POWER_RESET) += reset/ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o +obj-$(CONFIG_UCS1002_POWER) += ucs1002_power.o diff --git a/drivers/power/ucs1002_power.c b/drivers/power/ucs1002_power.c new file mode 100644 index 0000000..4f0e4ff --- /dev/null +++ b/drivers/power/ucs1002_power.c @@ -0,0 +1,1004 @@ +/* + * Driver for UCS1002 Programmable USB Port Power Controller + * + * Copyright (C) 2016 Zodiac Inflight Innovations + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + */ +#include <linux/freezer.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/power_supply.h> +#include <linux/regmap.h> + +#define POLL_INTERVAL (HZ * 2) + +/* UCS1002 Registers */ +#define UCS1002_REG_CURRENT_MEASUREMENT 0x00 + +/* + * The Total Accumulated Charge registers store the total accumulated charge + * delivered from the VS source to a portable device. The total value is + * calculated using four registers, from 01h to 04h. The bit weighting of + * the registers is given in mA/hrs. + */ +#define UCS1002_REG_TOTAL_ACC_CHARGE 0x01 + +/* Other Status Register */ +#define UCS1020_REG_OTHER_STATUS 0x0f +# define F_ALERT_PIN BIT(5) +# define F_ADET_PIN BIT(4) +# define F_CHG_ACT BIT(3) +# define F_EM_ACT BIT(2) +# define F_EM_STEP_MASK 0x03 + +/* Interrupt Status */ +#define UCS1002_REG_INTERRUPT_STATUS 0x10 +# define F_DISCHARGE_ERR BIT(6) +# define F_RESET BIT(5) +# define F_MIN_KEEP_OUT BIT(4) +# define F_TSD BIT(3) +# define F_OVER_VOLT BIT(2) +# define F_BACK_VOLT BIT(1) +# define F_OVER_ILIM BIT(0) + +/* Pin Status Register */ +#define UCS1002_REG_PIN_STATUS 0x14 +# define UCS1002_PWR_STATE_MASK 0x03 +# define F_PWR_EN_PIN BIT(6) +# define F_M2_PIN BIT(5) +# define F_M1_PIN BIT(4) +# define F_EM_EN_PIN BIT(3) +# define F_SEL_PIN BIT(2) +# define F_ACTIVE_MODE_MASK 0x38 +# define F_ACTIVE_MODE_SHIFT 3 + +/* General Configuration Register */ +#define UCS1002_REG_GENERAL_CFG 0x15 +# define F_ALERT_MASK BIT(6) +# define F_ALERT_LINK BIT(5) +# define F_DISCHARGE BIT(4) +# define F_RATION_EN BIT(3) +# define F_RATION_RST BIT(2) +# define F_RATION_BEH_MASK 0x03 +# define F_RATION_BEH_REPORT 0x00 +# define F_RATION_BEH_REPORT_DISCON 0x01 +# define F_RATION_BEH_DISCON_SLEEP 0x02 +# define F_RATION_BEH_IGNORE 0x03 + +/* Emulation Configuration Register */ +#define UCS1002_REG_EMU_CFG 0x16 + +/* Switch Configuration Register */ +#define UCS1002_REG_SWITCH_CFG 0x17 +# define F_PIN_IGNORE BIT(7) +# define F_EM_EN_SET BIT(5) +# define F_M2_SET BIT(4) +# define F_M1_SET BIT(3) +# define F_S0_SET BIT(2) +# define F_PWR_EN_SET BIT(1) +# define F_LATCH_SET BIT(0) +# define V_SET_ACTIVE_MODE_MASK 0x38 +# define V_SET_ACTIVE_MODE_PASSTHROUGH F_M2_SET +# define V_SET_ACTIVE_MODE_DEDICATED F_EM_EN_SET +# define V_SET_ACTIVE_MODE_BC12_DCP (F_M2_SET | F_EM_EN_SET) +# define V_SET_ACTIVE_MODE_BC12_SDP F_M1_SET +# define V_SET_ACTIVE_MODE_BC12_CDP (F_M1_SET | F_M2_SET | F_EM_EN_SET) + +/* Current Limit Register */ +#define UCS1002_REG_ILIMIT 0x19 +# define UCS1002_ILIM_SW_MASK 0x07 + +/* High-speed Switch Configuration Register */ +#define UCS1002_REG_HS_SWITCH_CFG 0x25 + +/* Custom Emulation Configuration Register */ +#define UCS1002_REG_CUSTOM_EMU_CFG_BASE 0x40 +#define V_CUSTOM_EMU_CFG_NREGS 12 + +/* Custom Current Limiting Behavior Config */ +#define UCS1002_REG_CUSTOM_ILIMIT_CFG 0x51 + +/* Product ID */ +#define UCS1002_REG_PRODUCT_ID 0xfd +# define UCS1002_PRODUCT_ID 0x4e + +/* Manufacture name */ +#define UCS1002_MANUFACTURER "SMSC" + +/* Number of registers to set a custom profile */ +#define UCS1002_PROFILE_NREGS 17 + +struct ucs1002_platform_data { + struct gpio_desc *gpiod_em; + struct gpio_desc *gpiod_m1; + struct gpio_desc *gpiod_m2; + struct gpio_desc *gpiod_pwr; +}; + +struct ucs1002_info { + struct power_supply *charger; + struct i2c_client *client; + struct regmap *regmap; + struct ucs1002_platform_data *pdata; + struct task_struct *poll_task; + + bool curr_alarm; + bool enabled; + bool present; + /* Interrupts */ + int irq_a_det; + int irq_alert; +}; + +static const struct regmap_config ucs1002_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static enum power_supply_property ucs1002_props[] = { + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_CHARGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CURRENT_MAX, + POWER_SUPPLY_PROP_PRESENT, /* the presence of PED */ + POWER_SUPPLY_PROP_MANUFACTURER, +}; + +/* + * Iterate through each element of the 'map' array until an element whose value + * is equal to 'value' is found. Return the index of the respective element or + * -EINVAL if no such element is found. + */ +static int ucs1002_find_idx(int value, const int *map, int map_size) +{ + int idx; + + for (idx = 0; idx < map_size; idx++) + if (value == map[idx]) + return idx; + + return -EINVAL; +} + +static int ucs1002_power_enable(struct ucs1002_info *info, bool enable) +{ + int ret, regval; + unsigned int val; + + /* Read the polarity setting determined by the SEL pin */ + ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®val); + if (ret < 0) + return ret; + + if (regval & F_SEL_PIN) + val = enable ? F_PWR_EN_SET : 0; + else + val = enable ? 0 : F_PWR_EN_SET; + + if (info->pdata) { + gpiod_set_value_cansleep(info->pdata->gpiod_pwr, val ? 0 : 1); + } else { + ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, + F_PWR_EN_SET, val); + if (ret < 0) + return ret; + } + + info->enabled = enable; + + return 0; +} + +static int ucs1002_get_online(struct ucs1002_info *info, + union power_supply_propval *val) +{ + int ret, regval; + + ret = regmap_read(info->regmap, UCS1020_REG_OTHER_STATUS, ®val); + if (ret < 0) + return -EINVAL; + + val->intval = (regval & F_CHG_ACT) ? 1 : 0; + + return 0; +} + +/* + * To fit within 32 bits some values are rounded (uA/h) + * + * For Total Accumulated Charge Middle Low Byte register, addr 03h, byte 2 + * + * B0: 0.01084 mA/h rounded to 11 uA/h + * B1: 0.02169 mA/h rounded to 22 uA/h + * B2: 0.04340 mA/h rounded to 43 uA/h + * B3: 0.08676 mA/h rounded to 87 uA/h + * B4: 0.17350 mA/h rounded to 173 uÁ/h + * + * For Total Accumulated Charge Low Byte register, addr 04h, byte 3 + * + * B6: 0.00271 mA/h rounded to 3 uA/h + * B7: 0.005422 mA/h rounded to 5 uA/h + */ +static const u32 ucs1002_charge_byte_values[4][8] = { + [0] = { + 710700, 1421000, 2843000, 5685000, 11371000, 22742000, + 45484000, 90968000 + }, + [1] = { + 2776, 5552, 11105, 22210, 44420, 88840, 177700, 355400 + }, + [2] = { + 11, 22, 43, 87, 173, 347, 694, 1388 + }, + [3] = { + 0, 0, 0, 0, 0, 0, 3, 5 + } +}; + +static int ucs1002_get_charge(struct ucs1002_info *info, + union power_supply_propval *val) +{ + int i, j, ret, regval; + unsigned int total = 0; + + ret = regmap_read(info->regmap, UCS1002_REG_GENERAL_CFG, ®val); + if (ret < 0) + return ret; + + for (i = 0; i < 4; i++) { + ret = regmap_read(info->regmap, + UCS1002_REG_TOTAL_ACC_CHARGE + i, + ®val); + if (ret < 0) + return -EINVAL; + + for (j = 0; j < 8; j++) + if (regval & BIT(j)) + total += ucs1002_charge_byte_values[i][j]; + } + + val->intval = total; + + return 0; +} + +/* + * The Current Measurement register stores the measured current value + * delivered to the portable device. The range is from 9.76 mA to 2.5 A. + * Following values are in uA. + */ +static const u32 ucs1002_current_measurement_values[] = { + 9760, 19500, 39000, 78100, 156200, 312300, 624600, + 1249300 +}; + +static int ucs1002_get_current(struct ucs1002_info *info, + union power_supply_propval *val) +{ + int n, ret, regval; + unsigned int total = 0; + + ret = regmap_read(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, + ®val); + if (ret < 0) + return -EINVAL; + + for (n = 0; n < ARRAY_SIZE(ucs1002_current_measurement_values); n++) + if (regval & BIT(n)) + total += ucs1002_current_measurement_values[n]; + + val->intval = total; + + return 0; +} + +/* + * The Current Limit register stores the maximum current used by the port + * switch. The range is from 500mA to 2.5 A. Following values are in uA. + */ +static const u32 ucs1002_current_limit_values[] = { + 500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000 +}; + +static int ucs1002_get_max_current(struct ucs1002_info *info, + union power_supply_propval *val) +{ + int ret, regval; + + ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, ®val); + if (ret < 0) + return ret; + + regval &= UCS1002_ILIM_SW_MASK; + val->intval = ucs1002_current_limit_values[regval]; + + return 0; +} + +static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val) +{ + int ret, idx; + + idx = ucs1002_find_idx(val, ucs1002_current_limit_values, + ARRAY_SIZE(ucs1002_current_limit_values)); + if (idx < 0) { + dev_err(&info->client->dev, + "%d is an invalid max current value\n", val); + return -EINVAL; + } + + ret = regmap_write(info->regmap, UCS1002_REG_ILIMIT, idx); + if (ret < 0) + return ret; + + return 0; +} + +static int ucs1002_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct ucs1002_info *info = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + return ucs1002_get_online(info, val); + case POWER_SUPPLY_PROP_CHARGE_NOW: + return ucs1002_get_charge(info, val); + case POWER_SUPPLY_PROP_CURRENT_NOW: + return ucs1002_get_current(info, val); + case POWER_SUPPLY_PROP_CURRENT_MAX: + return ucs1002_get_max_current(info, val); + case POWER_SUPPLY_PROP_PRESENT: + val->intval = info->present ? 1 : 0; + return 0; + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = UCS1002_MANUFACTURER; + return 0; + default: + return -EINVAL; + } +} + +static int ucs1002_set_property(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct ucs1002_info *info = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_CURRENT_MAX: + return ucs1002_set_max_current(info, val->intval); + default: + return -EINVAL; + } +} + +static int ucs1002_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_CURRENT_MAX: + return true; + default: + return false; + } +} + +static const struct power_supply_desc ucs1002_charger_desc = { + .name = "ucs1002", + .type = POWER_SUPPLY_TYPE_MAINS, + .get_property = ucs1002_get_property, + .set_property = ucs1002_set_property, + .property_is_writeable = ucs1002_property_is_writeable, + .properties = ucs1002_props, + .num_properties = ARRAY_SIZE(ucs1002_props), +}; + +static ssize_t ucs1002_sysfs_show_curr_alarm(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + + return scnprintf(buf, PAGE_SIZE, "%d\n", info->curr_alarm); +} + +static ssize_t ucs1002_sysfs_show_active_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret, regval; + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + + ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®val); + if (ret < 0) + return -EINVAL; + + regval &= F_ACTIVE_MODE_MASK; + regval = regval >> F_ACTIVE_MODE_SHIFT; + + switch (regval) { + /* Dedicated Charger Emulation Cycle */ + case 1: + case 3: + return scnprintf(buf, PAGE_SIZE, "%s\n", "dedicated"); + /* Data Pass-through */ + case 4: + case 6: + return scnprintf(buf, PAGE_SIZE, "%s\n", "pass-through"); + /* BC1.2 SDP */ + case 2: + return scnprintf(buf, PAGE_SIZE, "%s\n", "BC1.2-SDP"); + /* BC1.2 DCP */ + case 5: + return scnprintf(buf, PAGE_SIZE, "%s\n", "BC1.2-DCP"); + /* BC1.2 CDP */ + case 7: + return scnprintf(buf, PAGE_SIZE, "%s\n", "BC1.2-CDP"); + default: + return scnprintf(buf, PAGE_SIZE, "%s\n", "unknown"); + }; +} + +static ssize_t ucs1002_sysfs_set_active_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + int mode, ret = 0; + + if (strncmp(buf, "dedicated", 9) == 0) + mode = V_SET_ACTIVE_MODE_DEDICATED; + else if (strncmp(buf, "pass-through", 12) == 0) + mode = V_SET_ACTIVE_MODE_PASSTHROUGH; + else if (strncmp(buf, "BC1.2-DCP", 9) == 0) + mode = V_SET_ACTIVE_MODE_BC12_DCP; + else if (strncmp(buf, "BC1.2-SDP", 9) == 0) + mode = V_SET_ACTIVE_MODE_BC12_SDP; + else if (strncmp(buf, "BC1.2-CDP", 9) == 0) + mode = V_SET_ACTIVE_MODE_BC12_CDP; + else + return -EINVAL; + + if (info->pdata) { + gpiod_set_value_cansleep(info->pdata->gpiod_em, + (mode & F_EM_EN_SET) ? 1 : 0); + gpiod_set_value_cansleep(info->pdata->gpiod_m1, + (mode & F_M1_SET) ? 1 : 0); + gpiod_set_value_cansleep(info->pdata->gpiod_m2, + (mode & F_M2_SET) ? 1 : 0); + } else { + ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, + V_SET_ACTIVE_MODE_MASK, mode); + if (ret < 0) + return ret; + } + + return count; +} + +static ssize_t ucs1002_sysfs_show_enabled(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + + return scnprintf(buf, PAGE_SIZE, "%d\n", info->enabled); +} + +static ssize_t ucs1002_sysfs_set_enabled(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + long val; + int ret; + + if (kstrtol(buf, 10, &val) < 0) + return -EINVAL; + + ret = ucs1002_power_enable(info, val ? true : false); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t ucs1002_sysfs_show_profile(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + int idx, regval, ret, len = 0; + + /* + * Read Custom Emulation Profile + */ + + /* read registers 40h-4Ch (Custom Emulation Configuration) */ + for (idx = 0; idx < V_CUSTOM_EMU_CFG_NREGS; idx++) { + ret = regmap_read(info->regmap, + UCS1002_REG_CUSTOM_EMU_CFG_BASE + idx, + ®val); + if (ret < 0) + return ret; + + len += scnprintf(&buf[len], PAGE_SIZE, "%02x ", regval); + } + + /* read register 16h (Emulation Configuration) */ + ret = regmap_read(info->regmap, UCS1002_REG_EMU_CFG, ®val); + if (ret < 0) + return ret; + + len += scnprintf(&buf[len], PAGE_SIZE, "%02x ", regval); + + /* read register 19h (Current Limit) */ + ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, ®val); + if (ret < 0) + return ret; + + len += scnprintf(&buf[len], PAGE_SIZE, "%02x ", regval); + + /* read register 25h (High-speed Switch Configuration) */ + ret = regmap_read(info->regmap, UCS1002_REG_HS_SWITCH_CFG, ®val); + if (ret < 0) + return ret; + + len += scnprintf(&buf[len], PAGE_SIZE, "%02x ", regval); + + /* read register 51h (Custom Current Limiting Behavior Config) */ + ret = regmap_read(info->regmap, UCS1002_REG_CUSTOM_ILIMIT_CFG, + ®val); + if (ret < 0) + return ret; + + len += scnprintf(&buf[len], PAGE_SIZE, "%02x\n", regval); + + return len; +} + +static ssize_t ucs1002_sysfs_set_profile(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + const char *delim = " "; + char profile_data[256]; + char *token, *str_ptr; + int regval[UCS1002_PROFILE_NREGS]; + int idx = 0, ret; + + strncpy(profile_data, buf, 256); + str_ptr = &profile_data[0]; + + while (str_ptr && (idx < UCS1002_PROFILE_NREGS)) { + token = strsep(&str_ptr, delim); + if (kstrtoint(token, 0, ®val[idx])) { + dev_dbg(dev, "failed to convert %s to integer\n", + token); + return -EINVAL; + } + idx++; + } + + if (idx != UCS1002_PROFILE_NREGS) { + dev_dbg(dev, "failed to set emulation profile (%d)\n", idx); + return -EINVAL; + } + + /* + * Write Custom Emulation Profile + */ + + /* write registers 40h-4Ch (Custom Emulation Configuration) */ + for (idx = 0; idx < V_CUSTOM_EMU_CFG_NREGS; idx++) { + ret = regmap_write(info->regmap, + UCS1002_REG_CUSTOM_EMU_CFG_BASE + idx, + regval[idx]); + if (ret < 0) + return ret; + } + + /* write register 16h (Emulation Configuration) */ + ret = regmap_write(info->regmap, UCS1002_REG_EMU_CFG, + regval[idx++]); + if (ret < 0) + return ret; + + /* write register 19h (Current Limit) */ + ret = regmap_write(info->regmap, UCS1002_REG_ILIMIT, regval[idx++]); + if (ret < 0) + return ret; + + /* write register 25h (High-speed Switch Configuration) */ + ret = regmap_write(info->regmap, UCS1002_REG_HS_SWITCH_CFG, + regval[idx++]); + if (ret < 0) + return ret; + + /* write register 51h (Custom Current Limiting Behavior Config) */ + ret = regmap_write(info->regmap, UCS1002_REG_CUSTOM_ILIMIT_CFG, + regval[idx]); + if (ret < 0) + return ret; + + return count; +} + +const char * const ucs1002_pwr_state_values[] = { + "sleep", "detect", "active", "error" +}; + +static ssize_t ucs1002_sysfs_show_state(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret, regval; + struct power_supply *psy = dev_get_drvdata(dev); + struct ucs1002_info *info = power_supply_get_drvdata(psy); + + ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®val); + if (ret < 0) + return -EINVAL; + + regval &= UCS1002_PWR_STATE_MASK; + + return scnprintf(buf, PAGE_SIZE, "%s\n", + ucs1002_pwr_state_values[regval]); +} + +static DEVICE_ATTR(curr_alarm, S_IRUGO, ucs1002_sysfs_show_curr_alarm, NULL); +static DEVICE_ATTR(enabled, S_IWUSR | S_IRUGO, ucs1002_sysfs_show_enabled, + ucs1002_sysfs_set_enabled); +static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, ucs1002_sysfs_show_active_mode, + ucs1002_sysfs_set_active_mode); +static DEVICE_ATTR(profile, S_IWUSR | S_IRUGO, ucs1002_sysfs_show_profile, + ucs1002_sysfs_set_profile); +static DEVICE_ATTR(state, S_IRUGO, ucs1002_sysfs_show_state, NULL); + +static struct attribute *ucs1002_specific_attr[] = { + &dev_attr_curr_alarm.attr, + &dev_attr_enabled.attr, + &dev_attr_mode.attr, + &dev_attr_profile.attr, + &dev_attr_state.attr, + NULL, +}; + +static const struct attribute_group ucs1002_attr_group = { + .attrs = ucs1002_specific_attr, +}; + +static irqreturn_t ucs1002_charger_irq(int irq, void *data) +{ + int ret, regval; + bool present; + struct ucs1002_info *info = data; + + present = info->present; + + ret = regmap_read(info->regmap, UCS1020_REG_OTHER_STATUS, ®val); + if (ret < 0) + return IRQ_HANDLED; + + /* update attached status */ + info->present = (regval & F_ADET_PIN) ? true : false; + + /* notify the change */ + if (present != info->present) + power_supply_changed(info->charger); + + return IRQ_HANDLED; +} + +static irqreturn_t ucs1002_alert_irq(int irq, void *data) +{ + int ret, regval; + struct ucs1002_info *info = data; + + ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, ®val); + if (ret < 0) + return IRQ_HANDLED; + + /* update current alarm status */ + info->curr_alarm = (regval & F_OVER_ILIM) ? true : false; + + /* over current alarm */ + if (regval & F_OVER_ILIM) + power_supply_changed(info->charger); + + return IRQ_HANDLED; +} + +static int ucs1002_poll_task(void *data) +{ + set_freezable(); + + while (!kthread_should_stop()) { + schedule_timeout_interruptible(POLL_INTERVAL); + try_to_freeze(); + ucs1002_charger_irq(-1, data); + ucs1002_alert_irq(-1, data); + } + return 0; +} + +static int ucs1002_get_control_gpios(struct ucs1002_info *info) +{ + int ret, regval; + struct device *dev = &info->client->dev; + + info->pdata = devm_kzalloc(dev, sizeof(struct ucs1002_platform_data), + GFP_KERNEL); + if (!info->pdata) + return -ENOMEM; + + /* gpio for chip EM_EN pin */ + info->pdata->gpiod_em = devm_gpiod_get_index(dev, "control", 0, + GPIOD_OUT_HIGH); + if (IS_ERR(info->pdata->gpiod_em)) { + dev_err(dev, "unable to claim EM_EN gpio\n"); + return PTR_ERR(info->pdata->gpiod_em); + } + + /* gpio for chip M1 pin */ + info->pdata->gpiod_m1 = devm_gpiod_get_index(dev, "control", 1, + GPIOD_OUT_LOW); + if (IS_ERR(info->pdata->gpiod_m1)) { + dev_err(dev, "unable to claim M1 gpio\n"); + return PTR_ERR(info->pdata->gpiod_m1); + } + + /* gpio for chip M2 pin */ + info->pdata->gpiod_m2 = devm_gpiod_get_index(dev, "control", 2, + GPIOD_OUT_LOW); + if (IS_ERR(info->pdata->gpiod_m2)) { + dev_err(dev, "unable to claim EM_EN gpio\n"); + return PTR_ERR(info->pdata->gpiod_m2); + } + + /* Read the polarity setting determined by the SEL pin */ + ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, + ®val); + if (ret < 0) + return ret; + + /* gpio for chip PWR_EN pin - power off */ + info->pdata->gpiod_pwr = devm_gpiod_get_index(dev, "control", 3, + (regval & F_SEL_PIN) ? + GPIOD_OUT_LOW : + GPIOD_OUT_HIGH); + if (IS_ERR(info->pdata->gpiod_pwr)) { + dev_err(dev, "unable to claim PWR_EN gpio\n"); + return PTR_ERR(info->pdata->gpiod_pwr); + } + + return 0; +} + +static int ucs1002_probe(struct i2c_client *client, + const struct i2c_device_id *dev_id) +{ + int ret, regval; + u32 property; + struct ucs1002_info *info; + struct device *dev = &client->dev; + struct power_supply_config ucs1002_charger_config = {}; + + info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->regmap = devm_regmap_init_i2c(client, &ucs1002_regmap_config); + if (IS_ERR(info->regmap)) { + ret = PTR_ERR(info->regmap); + dev_err(dev, "regmap initialization failed: %d\n", ret); + return ret; + } + + info->client = client; + info->curr_alarm = false; + info->enabled = false; + info->present = false; + + info->irq_a_det = irq_of_parse_and_map(dev->of_node, 0); + info->irq_alert = irq_of_parse_and_map(dev->of_node, 1); + + i2c_set_clientdata(client, info); + + ucs1002_charger_config.of_node = dev->of_node; + ucs1002_charger_config.drv_data = info; + + ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, ®val); + if (ret < 0) + return ret; + + if (regval != UCS1002_PRODUCT_ID) { + dev_err(dev, + "Product ID does not match (0x%02x != 0x%02x)\n", + regval, UCS1002_PRODUCT_ID); + return -ENODEV; + } + + dev_info(dev, "registered with product id 0x%02x\n", + UCS1002_PRODUCT_ID); + + /* Enable charge rationing by default */ + ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG, + F_RATION_EN, F_RATION_EN); + if (ret < 0) + return ret; + + if (!device_property_present(dev, "control-gpios")) { + dev_dbg(dev, "set active mode selection through i2c\n"); + /* + * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active + * mode selection to Dedicated Charger Emulation Cycle. + * + * #M1 #M2 EM_EN + * 0 0 1 - Dedicated Charger Emulation Cycle + * + */ + ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, + F_PIN_IGNORE | F_EM_EN_SET | F_M2_SET | + F_M1_SET, F_PIN_IGNORE | F_EM_EN_SET); + if (ret < 0) + return ret; + } else { + dev_dbg(dev, "set active mode selection through pins\n"); + + /* + * The Active mode selection and power state will be set by the + * OR'd combination of the M1, M2, PWR_EN, and EM_EN pin states + * and the corresponding bit states. + */ + ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, + F_PIN_IGNORE | F_EM_EN_SET | F_M2_SET | + F_M1_SET | F_PWR_EN_SET, 0); + if (ret < 0) + return ret; + + /* + * PIN_IGNORE mode not set, so EM, M1 and M2 pins must be + * defined. + */ + ret = ucs1002_get_control_gpios(info); + if (ret) + return ret; + } + + /* + * The current limit is based on the resistor on the COMM_SEL / ILIM + * pin and this value cannot be changed to be higher than hardware + * set value. If the property is not set, the value set by hardware is + * the default. + */ + ret = device_property_read_u32(dev, "microchip,limit-microamps", + &property); + if (ret == 0) + ucs1002_set_max_current(info, property); + + info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc, + &ucs1002_charger_config); + if (IS_ERR(info->charger)) { + dev_err(dev, "failed to register power supply\n"); + return PTR_ERR(info->charger); + } + + ret = sysfs_create_group(&info->charger->dev.kobj, &ucs1002_attr_group); + if (ret < 0) { + dev_err(dev, "can't create sysfs entries\n"); + return ret; + } + + /* Turn on the port power switch */ + ucs1002_power_enable(info, true); + + if (info->irq_a_det && info->irq_alert) { + ret = devm_request_threaded_irq(dev, info->irq_a_det, NULL, + ucs1002_charger_irq, + IRQF_TRIGGER_FALLING | + IRQF_TRIGGER_RISING | + IRQF_ONESHOT, + "ucs1002-a_det", info); + if (ret) { + dev_err(dev, "failed to request A_DET threaded irq\n"); + goto fail_remove_group; + } + + ret = devm_request_threaded_irq(dev, info->irq_alert, NULL, + ucs1002_alert_irq, + IRQF_TRIGGER_FALLING | + IRQF_TRIGGER_RISING | + IRQF_ONESHOT, + "ucs1002-alert", info); + if (ret) { + dev_err(dev, "failed to request ALERT threaded irq\n"); + goto fail_remove_group; + } + } else { + dev_warn(dev, "no IRQ support, using polling mode\n"); + info->poll_task = kthread_run(ucs1002_poll_task, info, + "kucs1002"); + if (IS_ERR(info->poll_task)) { + ret = PTR_ERR(info->poll_task); + dev_err(dev, "unable to run kthread err (%d)\n", ret); + goto fail_remove_group; + } + } + + return 0; + +fail_remove_group: + sysfs_remove_group(&info->charger->dev.kobj, &ucs1002_attr_group); + return ret; +} + +static int ucs1002_remove(struct i2c_client *client) +{ + struct ucs1002_info *info = i2c_get_clientdata(client); + + if (info->poll_task) + kthread_stop(info->poll_task); + + sysfs_remove_group(&info->charger->dev.kobj, &ucs1002_attr_group); + + return 0; +} + +#if IS_ENABLED(CONFIG_OF) +static const struct of_device_id ucs1002_of_match[] = { + { .compatible = "microchip,ucs1002", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, ucs1002_of_match); +#endif + +static const struct i2c_device_id ucs1002_ids[] = { + {"ucs1002", 0}, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(i2c, ucs1002_ids); + +static struct i2c_driver ucs1002_driver = { + .driver = { + .name = "ucs1002", + .of_match_table = of_match_ptr(ucs1002_of_match), + }, + .probe = ucs1002_probe, + .remove = ucs1002_remove, + .id_table = ucs1002_ids, +}; +module_i2c_driver(ucs1002_driver); + +MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller"); +MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@xxxxxxxxxxxxx>"); +MODULE_LICENSE("GPL v2"); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
