[PATCH 2/2] power: ucs1002: Add support for Programmable USB Port Power Controller

From: Enric Balletbo i Serra
Date: Tue Jan 26 2016 - 04:14:10 EST

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>
---
drivers/power/Kconfig | 7 +
drivers/power/Makefile | 1 +
drivers/power/ucs1002_power.c | 979 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 987 insertions(+)
create mode 100644 drivers/power/ucs1002_power.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 1ddd13c..1ef2c23 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 POWER_UCS1002
+ 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..79b29b4 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_POWER_UCS1002) += ucs1002_power.o
diff --git a/drivers/power/ucs1002_power.c b/drivers/power/ucs1002_power.c
new file mode 100644
index 0000000..eba1ce0
--- /dev/null
+++ b/drivers/power/ucs1002_power.c
@@ -0,0 +1,979 @@
+/*
+ * 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, &regval);
+ 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) {
+ ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
+ F_PWR_EN_SET, val);
+ if (ret < 0)
+ return ret;
+ } else {
+ gpiod_set_value_cansleep(info->pdata->gpiod_pwr, val ? 0 : 1);
+ }
+
+ 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, &regval);
+ 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 uÃ/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, &regval);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < 4; i++) {
+ ret = regmap_read(info->regmap,
+ UCS1002_REG_TOTAL_ACC_CHARGE + i,
+ &regval);
+ 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,
+ &regval);
+ 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, &regval);
+ 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, &regval);
+ 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,
+ &regval);
+ 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, &regval);
+ 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, &regval);
+ 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, &regval);
+ 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,
+ &regval);
+ 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, &regval[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, &regval);
+ 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, &regval);
+ 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, &regval);
+ 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_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, &regval);
+ 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;
+
+ 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;
+ }
+
+ /* Optional properties */
+
+ if (device_property_read_bool(dev, "microchip,pin-ignore")) {
+ 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");
+ /*
+ * PIN_IGNORE mode not set, so EM, M1 and M2 pins must be
+ * defined
+ */
+ 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(dev, "em",
+ 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);
+ }
+
+ /* Read the polarity setting determined by the SEL pin */
+ ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS,
+ &regval);
+ if (ret < 0)
+ return ret;
+
+ /* gpio for chip PWR_EN pin - power off */
+ info->pdata->gpiod_pwr = devm_gpiod_get(dev, "pwr",
+ (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);
+ }
+
+ /* gpio for chip M1 pin */
+ info->pdata->gpiod_m1 = devm_gpiod_get(dev, "m1",
+ 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(dev, "m2",
+ 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);
+ }
+ }
+
+ /*
+ * 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,current-limit",
+ &property);
+ if (ret == 0)
+ ucs1002_set_max_current(info, property);
+
+ /* 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");
+ return ret;
+ }
+
+ 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");
+ return ret;
+ }
+ } 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);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+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