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667 lines
17 KiB
667 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* I2C client/driver for the Linear Technology LTC2941, LTC2942, LTC2943 |
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* and LTC2944 Battery Gas Gauge IC |
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* |
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* Copyright (C) 2014 Topic Embedded Systems |
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* |
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* Author: Auryn Verwegen |
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* Author: Mike Looijmans |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/types.h> |
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#include <linux/errno.h> |
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#include <linux/swab.h> |
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#include <linux/i2c.h> |
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#include <linux/delay.h> |
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#include <linux/power_supply.h> |
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#include <linux/slab.h> |
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#define I16_MSB(x) ((x >> 8) & 0xFF) |
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#define I16_LSB(x) (x & 0xFF) |
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#define LTC294X_WORK_DELAY 10 /* Update delay in seconds */ |
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#define LTC294X_MAX_VALUE 0xFFFF |
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#define LTC294X_MID_SUPPLY 0x7FFF |
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#define LTC2941_MAX_PRESCALER_EXP 7 |
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#define LTC2943_MAX_PRESCALER_EXP 6 |
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enum ltc294x_reg { |
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LTC294X_REG_STATUS = 0x00, |
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LTC294X_REG_CONTROL = 0x01, |
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LTC294X_REG_ACC_CHARGE_MSB = 0x02, |
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LTC294X_REG_ACC_CHARGE_LSB = 0x03, |
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LTC294X_REG_CHARGE_THR_HIGH_MSB = 0x04, |
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LTC294X_REG_CHARGE_THR_HIGH_LSB = 0x05, |
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LTC294X_REG_CHARGE_THR_LOW_MSB = 0x06, |
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LTC294X_REG_CHARGE_THR_LOW_LSB = 0x07, |
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LTC294X_REG_VOLTAGE_MSB = 0x08, |
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LTC294X_REG_VOLTAGE_LSB = 0x09, |
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LTC2942_REG_TEMPERATURE_MSB = 0x0C, |
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LTC2942_REG_TEMPERATURE_LSB = 0x0D, |
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LTC2943_REG_CURRENT_MSB = 0x0E, |
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LTC2943_REG_CURRENT_LSB = 0x0F, |
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LTC2943_REG_TEMPERATURE_MSB = 0x14, |
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LTC2943_REG_TEMPERATURE_LSB = 0x15, |
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}; |
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enum ltc294x_id { |
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LTC2941_ID, |
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LTC2942_ID, |
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LTC2943_ID, |
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LTC2944_ID, |
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}; |
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#define LTC2941_REG_STATUS_CHIP_ID BIT(7) |
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#define LTC2942_REG_CONTROL_MODE_SCAN (BIT(7) | BIT(6)) |
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#define LTC2943_REG_CONTROL_MODE_SCAN BIT(7) |
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#define LTC294X_REG_CONTROL_PRESCALER_MASK (BIT(5) | BIT(4) | BIT(3)) |
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#define LTC294X_REG_CONTROL_SHUTDOWN_MASK (BIT(0)) |
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#define LTC294X_REG_CONTROL_PRESCALER_SET(x) \ |
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((x << 3) & LTC294X_REG_CONTROL_PRESCALER_MASK) |
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#define LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED 0 |
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#define LTC294X_REG_CONTROL_ADC_DISABLE(x) ((x) & ~(BIT(7) | BIT(6))) |
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struct ltc294x_info { |
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struct i2c_client *client; /* I2C Client pointer */ |
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struct power_supply *supply; /* Supply pointer */ |
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struct power_supply_desc supply_desc; /* Supply description */ |
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struct delayed_work work; /* Work scheduler */ |
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enum ltc294x_id id; /* Chip type */ |
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int charge; /* Last charge register content */ |
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int r_sense; /* mOhm */ |
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int Qlsb; /* nAh */ |
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}; |
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static inline int convert_bin_to_uAh( |
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const struct ltc294x_info *info, int Q) |
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{ |
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return ((Q * (info->Qlsb / 10))) / 100; |
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} |
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static inline int convert_uAh_to_bin( |
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const struct ltc294x_info *info, int uAh) |
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{ |
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int Q; |
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Q = (uAh * 100) / (info->Qlsb/10); |
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return (Q < LTC294X_MAX_VALUE) ? Q : LTC294X_MAX_VALUE; |
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} |
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static int ltc294x_read_regs(struct i2c_client *client, |
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enum ltc294x_reg reg, u8 *buf, int num_regs) |
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{ |
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int ret; |
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struct i2c_msg msgs[2] = { }; |
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u8 reg_start = reg; |
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msgs[0].addr = client->addr; |
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msgs[0].len = 1; |
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msgs[0].buf = ®_start; |
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msgs[1].addr = client->addr; |
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msgs[1].len = num_regs; |
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msgs[1].buf = buf; |
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msgs[1].flags = I2C_M_RD; |
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ret = i2c_transfer(client->adapter, &msgs[0], 2); |
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if (ret < 0) { |
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dev_err(&client->dev, "ltc2941 read_reg failed!\n"); |
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return ret; |
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} |
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dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n", |
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__func__, reg, num_regs, *buf); |
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return 0; |
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} |
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static int ltc294x_write_regs(struct i2c_client *client, |
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enum ltc294x_reg reg, const u8 *buf, int num_regs) |
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{ |
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int ret; |
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u8 reg_start = reg; |
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ret = i2c_smbus_write_i2c_block_data(client, reg_start, num_regs, buf); |
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if (ret < 0) { |
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dev_err(&client->dev, "ltc2941 write_reg failed!\n"); |
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return ret; |
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} |
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dev_dbg(&client->dev, "%s (%#x, %d) -> %#x\n", |
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__func__, reg, num_regs, *buf); |
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return 0; |
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} |
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static int ltc294x_reset(const struct ltc294x_info *info, int prescaler_exp) |
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{ |
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int ret; |
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u8 value; |
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u8 control; |
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/* Read status and control registers */ |
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ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1); |
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if (ret < 0) { |
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dev_err(&info->client->dev, |
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"Could not read registers from device\n"); |
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goto error_exit; |
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} |
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control = LTC294X_REG_CONTROL_PRESCALER_SET(prescaler_exp) | |
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LTC294X_REG_CONTROL_ALCC_CONFIG_DISABLED; |
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/* Put device into "monitor" mode */ |
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switch (info->id) { |
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case LTC2942_ID: /* 2942 measures every 2 sec */ |
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control |= LTC2942_REG_CONTROL_MODE_SCAN; |
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break; |
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case LTC2943_ID: |
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case LTC2944_ID: /* 2943 and 2944 measure every 10 sec */ |
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control |= LTC2943_REG_CONTROL_MODE_SCAN; |
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break; |
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default: |
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break; |
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} |
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if (value != control) { |
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ret = ltc294x_write_regs(info->client, |
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LTC294X_REG_CONTROL, &control, 1); |
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if (ret < 0) { |
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dev_err(&info->client->dev, |
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"Could not write register\n"); |
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goto error_exit; |
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} |
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} |
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return 0; |
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error_exit: |
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return ret; |
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} |
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static int ltc294x_read_charge_register(const struct ltc294x_info *info, |
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enum ltc294x_reg reg) |
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{ |
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int ret; |
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u8 datar[2]; |
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ret = ltc294x_read_regs(info->client, reg, &datar[0], 2); |
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if (ret < 0) |
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return ret; |
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return (datar[0] << 8) + datar[1]; |
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} |
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static int ltc294x_get_charge(const struct ltc294x_info *info, |
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enum ltc294x_reg reg, int *val) |
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{ |
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int value = ltc294x_read_charge_register(info, reg); |
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if (value < 0) |
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return value; |
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/* When r_sense < 0, this counts up when the battery discharges */ |
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if (info->Qlsb < 0) |
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value -= 0xFFFF; |
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*val = convert_bin_to_uAh(info, value); |
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return 0; |
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} |
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static int ltc294x_set_charge_now(const struct ltc294x_info *info, int val) |
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{ |
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int ret; |
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u8 dataw[2]; |
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u8 ctrl_reg; |
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s32 value; |
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value = convert_uAh_to_bin(info, val); |
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/* Direction depends on how sense+/- were connected */ |
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if (info->Qlsb < 0) |
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value += 0xFFFF; |
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if ((value < 0) || (value > 0xFFFF)) /* input validation */ |
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return -EINVAL; |
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/* Read control register */ |
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ret = ltc294x_read_regs(info->client, |
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LTC294X_REG_CONTROL, &ctrl_reg, 1); |
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if (ret < 0) |
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return ret; |
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/* Disable analog section */ |
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ctrl_reg |= LTC294X_REG_CONTROL_SHUTDOWN_MASK; |
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ret = ltc294x_write_regs(info->client, |
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LTC294X_REG_CONTROL, &ctrl_reg, 1); |
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if (ret < 0) |
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return ret; |
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/* Set new charge value */ |
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dataw[0] = I16_MSB(value); |
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dataw[1] = I16_LSB(value); |
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ret = ltc294x_write_regs(info->client, |
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LTC294X_REG_ACC_CHARGE_MSB, &dataw[0], 2); |
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if (ret < 0) |
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goto error_exit; |
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/* Enable analog section */ |
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error_exit: |
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ctrl_reg &= ~LTC294X_REG_CONTROL_SHUTDOWN_MASK; |
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ret = ltc294x_write_regs(info->client, |
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LTC294X_REG_CONTROL, &ctrl_reg, 1); |
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return ret < 0 ? ret : 0; |
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} |
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static int ltc294x_set_charge_thr(const struct ltc294x_info *info, |
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enum ltc294x_reg reg, int val) |
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{ |
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u8 dataw[2]; |
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s32 value; |
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value = convert_uAh_to_bin(info, val); |
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/* Direction depends on how sense+/- were connected */ |
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if (info->Qlsb < 0) |
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value += 0xFFFF; |
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if ((value < 0) || (value > 0xFFFF)) /* input validation */ |
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return -EINVAL; |
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/* Set new charge value */ |
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dataw[0] = I16_MSB(value); |
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dataw[1] = I16_LSB(value); |
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return ltc294x_write_regs(info->client, reg, &dataw[0], 2); |
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} |
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static int ltc294x_get_charge_counter( |
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const struct ltc294x_info *info, int *val) |
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{ |
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int value = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB); |
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if (value < 0) |
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return value; |
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value -= LTC294X_MID_SUPPLY; |
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*val = convert_bin_to_uAh(info, value); |
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return 0; |
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} |
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static int ltc294x_get_voltage(const struct ltc294x_info *info, int *val) |
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{ |
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int ret; |
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u8 datar[2]; |
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u32 value; |
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ret = ltc294x_read_regs(info->client, |
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LTC294X_REG_VOLTAGE_MSB, &datar[0], 2); |
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value = (datar[0] << 8) | datar[1]; |
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switch (info->id) { |
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case LTC2943_ID: |
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value *= 23600 * 2; |
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value /= 0xFFFF; |
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value *= 1000 / 2; |
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break; |
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case LTC2944_ID: |
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value *= 70800 / 5*4; |
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value /= 0xFFFF; |
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value *= 1000 * 5/4; |
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break; |
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default: |
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value *= 6000 * 10; |
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value /= 0xFFFF; |
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value *= 1000 / 10; |
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break; |
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} |
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*val = value; |
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return ret; |
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} |
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static int ltc294x_get_current(const struct ltc294x_info *info, int *val) |
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{ |
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int ret; |
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u8 datar[2]; |
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s32 value; |
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ret = ltc294x_read_regs(info->client, |
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LTC2943_REG_CURRENT_MSB, &datar[0], 2); |
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value = (datar[0] << 8) | datar[1]; |
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value -= 0x7FFF; |
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if (info->id == LTC2944_ID) |
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value *= 64000; |
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else |
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value *= 60000; |
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/* Value is in range -32k..+32k, r_sense is usually 10..50 mOhm, |
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* the formula below keeps everything in s32 range while preserving |
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* enough digits */ |
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*val = 1000 * (value / (info->r_sense * 0x7FFF)); /* in uA */ |
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return ret; |
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} |
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static int ltc294x_get_temperature(const struct ltc294x_info *info, int *val) |
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{ |
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enum ltc294x_reg reg; |
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int ret; |
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u8 datar[2]; |
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u32 value; |
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if (info->id == LTC2942_ID) { |
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reg = LTC2942_REG_TEMPERATURE_MSB; |
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value = 6000; /* Full-scale is 600 Kelvin */ |
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} else { |
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reg = LTC2943_REG_TEMPERATURE_MSB; |
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value = 5100; /* Full-scale is 510 Kelvin */ |
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} |
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ret = ltc294x_read_regs(info->client, reg, &datar[0], 2); |
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value *= (datar[0] << 8) | datar[1]; |
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/* Convert to tenths of degree Celsius */ |
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*val = value / 0xFFFF - 2722; |
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return ret; |
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} |
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static int ltc294x_get_property(struct power_supply *psy, |
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enum power_supply_property prop, |
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union power_supply_propval *val) |
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{ |
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struct ltc294x_info *info = power_supply_get_drvdata(psy); |
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switch (prop) { |
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case POWER_SUPPLY_PROP_CHARGE_FULL: |
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return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_HIGH_MSB, |
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&val->intval); |
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case POWER_SUPPLY_PROP_CHARGE_EMPTY: |
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return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_LOW_MSB, |
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&val->intval); |
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case POWER_SUPPLY_PROP_CHARGE_NOW: |
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return ltc294x_get_charge(info, LTC294X_REG_ACC_CHARGE_MSB, |
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&val->intval); |
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case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
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return ltc294x_get_charge_counter(info, &val->intval); |
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case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
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return ltc294x_get_voltage(info, &val->intval); |
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case POWER_SUPPLY_PROP_CURRENT_NOW: |
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return ltc294x_get_current(info, &val->intval); |
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case POWER_SUPPLY_PROP_TEMP: |
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return ltc294x_get_temperature(info, &val->intval); |
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default: |
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return -EINVAL; |
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} |
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} |
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static int ltc294x_set_property(struct power_supply *psy, |
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enum power_supply_property psp, |
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const union power_supply_propval *val) |
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{ |
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struct ltc294x_info *info = power_supply_get_drvdata(psy); |
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switch (psp) { |
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case POWER_SUPPLY_PROP_CHARGE_FULL: |
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return ltc294x_set_charge_thr(info, |
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LTC294X_REG_CHARGE_THR_HIGH_MSB, val->intval); |
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case POWER_SUPPLY_PROP_CHARGE_EMPTY: |
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return ltc294x_set_charge_thr(info, |
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LTC294X_REG_CHARGE_THR_LOW_MSB, val->intval); |
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case POWER_SUPPLY_PROP_CHARGE_NOW: |
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return ltc294x_set_charge_now(info, val->intval); |
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default: |
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return -EPERM; |
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} |
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} |
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static int ltc294x_property_is_writeable( |
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struct power_supply *psy, enum power_supply_property psp) |
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{ |
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switch (psp) { |
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case POWER_SUPPLY_PROP_CHARGE_FULL: |
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case POWER_SUPPLY_PROP_CHARGE_EMPTY: |
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case POWER_SUPPLY_PROP_CHARGE_NOW: |
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return 1; |
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default: |
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return 0; |
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} |
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} |
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static void ltc294x_update(struct ltc294x_info *info) |
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{ |
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int charge = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB); |
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if (charge != info->charge) { |
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info->charge = charge; |
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power_supply_changed(info->supply); |
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} |
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} |
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static void ltc294x_work(struct work_struct *work) |
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{ |
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struct ltc294x_info *info; |
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info = container_of(work, struct ltc294x_info, work.work); |
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ltc294x_update(info); |
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schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ); |
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} |
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static enum power_supply_property ltc294x_properties[] = { |
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POWER_SUPPLY_PROP_CHARGE_COUNTER, |
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POWER_SUPPLY_PROP_CHARGE_FULL, |
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POWER_SUPPLY_PROP_CHARGE_EMPTY, |
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POWER_SUPPLY_PROP_CHARGE_NOW, |
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POWER_SUPPLY_PROP_VOLTAGE_NOW, |
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POWER_SUPPLY_PROP_TEMP, |
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POWER_SUPPLY_PROP_CURRENT_NOW, |
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}; |
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static int ltc294x_i2c_remove(struct i2c_client *client) |
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{ |
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struct ltc294x_info *info = i2c_get_clientdata(client); |
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cancel_delayed_work_sync(&info->work); |
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power_supply_unregister(info->supply); |
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return 0; |
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} |
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static int ltc294x_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct power_supply_config psy_cfg = {}; |
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struct ltc294x_info *info; |
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struct device_node *np; |
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int ret; |
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u32 prescaler_exp; |
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s32 r_sense; |
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u8 status; |
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info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL); |
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if (info == NULL) |
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return -ENOMEM; |
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i2c_set_clientdata(client, info); |
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np = of_node_get(client->dev.of_node); |
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info->id = (enum ltc294x_id) (uintptr_t) of_device_get_match_data( |
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&client->dev); |
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info->supply_desc.name = np->name; |
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|
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/* r_sense can be negative, when sense+ is connected to the battery |
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* instead of the sense-. This results in reversed measurements. */ |
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ret = of_property_read_u32(np, "lltc,resistor-sense", &r_sense); |
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if (ret < 0) { |
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dev_err(&client->dev, |
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"Could not find lltc,resistor-sense in devicetree\n"); |
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return ret; |
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} |
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info->r_sense = r_sense; |
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ret = of_property_read_u32(np, "lltc,prescaler-exponent", |
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&prescaler_exp); |
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if (ret < 0) { |
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dev_warn(&client->dev, |
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"lltc,prescaler-exponent not in devicetree\n"); |
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prescaler_exp = LTC2941_MAX_PRESCALER_EXP; |
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} |
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|
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if (info->id == LTC2943_ID) { |
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if (prescaler_exp > LTC2943_MAX_PRESCALER_EXP) |
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prescaler_exp = LTC2943_MAX_PRESCALER_EXP; |
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info->Qlsb = ((340 * 50000) / r_sense) / |
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(4096 / (1 << (2*prescaler_exp))); |
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} else { |
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if (prescaler_exp > LTC2941_MAX_PRESCALER_EXP) |
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prescaler_exp = LTC2941_MAX_PRESCALER_EXP; |
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info->Qlsb = ((85 * 50000) / r_sense) / |
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(128 / (1 << prescaler_exp)); |
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} |
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|
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/* Read status register to check for LTC2942 */ |
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if (info->id == LTC2941_ID || info->id == LTC2942_ID) { |
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ret = ltc294x_read_regs(client, LTC294X_REG_STATUS, &status, 1); |
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if (ret < 0) { |
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dev_err(&client->dev, |
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"Could not read status register\n"); |
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return ret; |
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} |
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if (status & LTC2941_REG_STATUS_CHIP_ID) |
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info->id = LTC2941_ID; |
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else |
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info->id = LTC2942_ID; |
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} |
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|
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info->client = client; |
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info->supply_desc.type = POWER_SUPPLY_TYPE_BATTERY; |
|
info->supply_desc.properties = ltc294x_properties; |
|
switch (info->id) { |
|
case LTC2944_ID: |
|
case LTC2943_ID: |
|
info->supply_desc.num_properties = |
|
ARRAY_SIZE(ltc294x_properties); |
|
break; |
|
case LTC2942_ID: |
|
info->supply_desc.num_properties = |
|
ARRAY_SIZE(ltc294x_properties) - 1; |
|
break; |
|
case LTC2941_ID: |
|
default: |
|
info->supply_desc.num_properties = |
|
ARRAY_SIZE(ltc294x_properties) - 3; |
|
break; |
|
} |
|
info->supply_desc.get_property = ltc294x_get_property; |
|
info->supply_desc.set_property = ltc294x_set_property; |
|
info->supply_desc.property_is_writeable = ltc294x_property_is_writeable; |
|
info->supply_desc.external_power_changed = NULL; |
|
|
|
psy_cfg.drv_data = info; |
|
|
|
INIT_DELAYED_WORK(&info->work, ltc294x_work); |
|
|
|
ret = ltc294x_reset(info, prescaler_exp); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "Communication with chip failed\n"); |
|
return ret; |
|
} |
|
|
|
info->supply = power_supply_register(&client->dev, &info->supply_desc, |
|
&psy_cfg); |
|
if (IS_ERR(info->supply)) { |
|
dev_err(&client->dev, "failed to register ltc2941\n"); |
|
return PTR_ERR(info->supply); |
|
} else { |
|
schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void ltc294x_i2c_shutdown(struct i2c_client *client) |
|
{ |
|
struct ltc294x_info *info = i2c_get_clientdata(client); |
|
int ret; |
|
u8 value; |
|
u8 control; |
|
|
|
/* The LTC2941 does not need any special handling */ |
|
if (info->id == LTC2941_ID) |
|
return; |
|
|
|
/* Read control register */ |
|
ret = ltc294x_read_regs(info->client, LTC294X_REG_CONTROL, &value, 1); |
|
if (ret < 0) |
|
return; |
|
|
|
/* Disable continuous ADC conversion as this drains the battery */ |
|
control = LTC294X_REG_CONTROL_ADC_DISABLE(value); |
|
if (control != value) |
|
ltc294x_write_regs(info->client, LTC294X_REG_CONTROL, |
|
&control, 1); |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
|
|
static int ltc294x_suspend(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct ltc294x_info *info = i2c_get_clientdata(client); |
|
|
|
cancel_delayed_work(&info->work); |
|
return 0; |
|
} |
|
|
|
static int ltc294x_resume(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct ltc294x_info *info = i2c_get_clientdata(client); |
|
|
|
schedule_delayed_work(&info->work, LTC294X_WORK_DELAY * HZ); |
|
return 0; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(ltc294x_pm_ops, ltc294x_suspend, ltc294x_resume); |
|
#define LTC294X_PM_OPS (<c294x_pm_ops) |
|
|
|
#else |
|
#define LTC294X_PM_OPS NULL |
|
#endif /* CONFIG_PM_SLEEP */ |
|
|
|
|
|
static const struct i2c_device_id ltc294x_i2c_id[] = { |
|
{ "ltc2941", LTC2941_ID, }, |
|
{ "ltc2942", LTC2942_ID, }, |
|
{ "ltc2943", LTC2943_ID, }, |
|
{ "ltc2944", LTC2944_ID, }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, ltc294x_i2c_id); |
|
|
|
static const struct of_device_id ltc294x_i2c_of_match[] = { |
|
{ |
|
.compatible = "lltc,ltc2941", |
|
.data = (void *)LTC2941_ID, |
|
}, |
|
{ |
|
.compatible = "lltc,ltc2942", |
|
.data = (void *)LTC2942_ID, |
|
}, |
|
{ |
|
.compatible = "lltc,ltc2943", |
|
.data = (void *)LTC2943_ID, |
|
}, |
|
{ |
|
.compatible = "lltc,ltc2944", |
|
.data = (void *)LTC2944_ID, |
|
}, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, ltc294x_i2c_of_match); |
|
|
|
static struct i2c_driver ltc294x_driver = { |
|
.driver = { |
|
.name = "LTC2941", |
|
.of_match_table = ltc294x_i2c_of_match, |
|
.pm = LTC294X_PM_OPS, |
|
}, |
|
.probe = ltc294x_i2c_probe, |
|
.remove = ltc294x_i2c_remove, |
|
.shutdown = ltc294x_i2c_shutdown, |
|
.id_table = ltc294x_i2c_id, |
|
}; |
|
module_i2c_driver(ltc294x_driver); |
|
|
|
MODULE_AUTHOR("Auryn Verwegen, Topic Embedded Systems"); |
|
MODULE_AUTHOR("Mike Looijmans, Topic Embedded Products"); |
|
MODULE_DESCRIPTION("LTC2941/LTC2942/LTC2943/LTC2944 Battery Gas Gauge IC driver"); |
|
MODULE_LICENSE("GPL");
|
|
|