408 lines
10 KiB
C
408 lines
10 KiB
C
/*
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* DA9150 GPADC Driver
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*
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* Copyright (c) 2014 Dialog Semiconductor
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*
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* Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/completion.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/machine.h>
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#include <linux/iio/driver.h>
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#include <linux/mfd/da9150/core.h>
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#include <linux/mfd/da9150/registers.h>
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/* Channels */
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enum da9150_gpadc_hw_channel {
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DA9150_GPADC_HW_CHAN_GPIOA_2V = 0,
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DA9150_GPADC_HW_CHAN_GPIOA_2V_,
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DA9150_GPADC_HW_CHAN_GPIOB_2V,
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DA9150_GPADC_HW_CHAN_GPIOB_2V_,
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DA9150_GPADC_HW_CHAN_GPIOC_2V,
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DA9150_GPADC_HW_CHAN_GPIOC_2V_,
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DA9150_GPADC_HW_CHAN_GPIOD_2V,
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DA9150_GPADC_HW_CHAN_GPIOD_2V_,
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DA9150_GPADC_HW_CHAN_IBUS_SENSE,
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DA9150_GPADC_HW_CHAN_IBUS_SENSE_,
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DA9150_GPADC_HW_CHAN_VBUS_DIV,
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DA9150_GPADC_HW_CHAN_VBUS_DIV_,
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DA9150_GPADC_HW_CHAN_ID,
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DA9150_GPADC_HW_CHAN_ID_,
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DA9150_GPADC_HW_CHAN_VSYS,
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DA9150_GPADC_HW_CHAN_VSYS_,
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DA9150_GPADC_HW_CHAN_GPIOA_6V,
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DA9150_GPADC_HW_CHAN_GPIOA_6V_,
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DA9150_GPADC_HW_CHAN_GPIOB_6V,
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DA9150_GPADC_HW_CHAN_GPIOB_6V_,
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DA9150_GPADC_HW_CHAN_GPIOC_6V,
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DA9150_GPADC_HW_CHAN_GPIOC_6V_,
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DA9150_GPADC_HW_CHAN_GPIOD_6V,
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DA9150_GPADC_HW_CHAN_GPIOD_6V_,
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DA9150_GPADC_HW_CHAN_VBAT,
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DA9150_GPADC_HW_CHAN_VBAT_,
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DA9150_GPADC_HW_CHAN_TBAT,
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DA9150_GPADC_HW_CHAN_TBAT_,
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DA9150_GPADC_HW_CHAN_TJUNC_CORE,
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DA9150_GPADC_HW_CHAN_TJUNC_CORE_,
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DA9150_GPADC_HW_CHAN_TJUNC_OVP,
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DA9150_GPADC_HW_CHAN_TJUNC_OVP_,
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};
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enum da9150_gpadc_channel {
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DA9150_GPADC_CHAN_GPIOA = 0,
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DA9150_GPADC_CHAN_GPIOB,
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DA9150_GPADC_CHAN_GPIOC,
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DA9150_GPADC_CHAN_GPIOD,
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DA9150_GPADC_CHAN_IBUS,
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DA9150_GPADC_CHAN_VBUS,
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DA9150_GPADC_CHAN_VSYS,
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DA9150_GPADC_CHAN_VBAT,
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DA9150_GPADC_CHAN_TBAT,
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DA9150_GPADC_CHAN_TJUNC_CORE,
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DA9150_GPADC_CHAN_TJUNC_OVP,
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};
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/* Private data */
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struct da9150_gpadc {
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struct da9150 *da9150;
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struct device *dev;
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struct mutex lock;
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struct completion complete;
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};
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static irqreturn_t da9150_gpadc_irq(int irq, void *data)
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{
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struct da9150_gpadc *gpadc = data;
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complete(&gpadc->complete);
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return IRQ_HANDLED;
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}
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static int da9150_gpadc_read_adc(struct da9150_gpadc *gpadc, int hw_chan)
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{
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u8 result_regs[2];
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int result;
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mutex_lock(&gpadc->lock);
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/* Set channel & enable measurement */
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da9150_reg_write(gpadc->da9150, DA9150_GPADC_MAN,
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(DA9150_GPADC_EN_MASK |
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hw_chan << DA9150_GPADC_MUX_SHIFT));
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/* Consume left-over completion from a previous timeout */
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try_wait_for_completion(&gpadc->complete);
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/* Check for actual completion */
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wait_for_completion_timeout(&gpadc->complete, msecs_to_jiffies(5));
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/* Read result and status from device */
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da9150_bulk_read(gpadc->da9150, DA9150_GPADC_RES_A, 2, result_regs);
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mutex_unlock(&gpadc->lock);
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/* Check to make sure device really has completed reading */
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if (result_regs[1] & DA9150_GPADC_RUN_MASK) {
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dev_err(gpadc->dev, "Timeout on channel %d of GPADC\n",
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hw_chan);
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return -ETIMEDOUT;
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}
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/* LSBs - 2 bits */
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result = (result_regs[1] & DA9150_GPADC_RES_L_MASK) >>
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DA9150_GPADC_RES_L_SHIFT;
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/* MSBs - 8 bits */
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result |= result_regs[0] << DA9150_GPADC_RES_L_BITS;
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return result;
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}
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static inline int da9150_gpadc_gpio_6v_voltage_now(int raw_val)
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{
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/* Convert to mV */
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return (6 * ((raw_val * 1000) + 500)) / 1024;
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}
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static inline int da9150_gpadc_ibus_current_avg(int raw_val)
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{
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/* Convert to mA */
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return (4 * ((raw_val * 1000) + 500)) / 2048;
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}
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static inline int da9150_gpadc_vbus_21v_voltage_now(int raw_val)
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{
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/* Convert to mV */
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return (21 * ((raw_val * 1000) + 500)) / 1024;
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}
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static inline int da9150_gpadc_vsys_6v_voltage_now(int raw_val)
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{
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/* Convert to mV */
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return (3 * ((raw_val * 1000) + 500)) / 512;
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}
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static int da9150_gpadc_read_processed(struct da9150_gpadc *gpadc, int channel,
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int hw_chan, int *val)
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{
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int raw_val;
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raw_val = da9150_gpadc_read_adc(gpadc, hw_chan);
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if (raw_val < 0)
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return raw_val;
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switch (channel) {
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case DA9150_GPADC_CHAN_GPIOA:
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case DA9150_GPADC_CHAN_GPIOB:
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case DA9150_GPADC_CHAN_GPIOC:
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case DA9150_GPADC_CHAN_GPIOD:
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*val = da9150_gpadc_gpio_6v_voltage_now(raw_val);
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break;
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case DA9150_GPADC_CHAN_IBUS:
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*val = da9150_gpadc_ibus_current_avg(raw_val);
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break;
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case DA9150_GPADC_CHAN_VBUS:
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*val = da9150_gpadc_vbus_21v_voltage_now(raw_val);
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break;
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case DA9150_GPADC_CHAN_VSYS:
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*val = da9150_gpadc_vsys_6v_voltage_now(raw_val);
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break;
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default:
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/* No processing for other channels so return raw value */
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*val = raw_val;
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break;
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}
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return IIO_VAL_INT;
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}
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static int da9150_gpadc_read_scale(int channel, int *val, int *val2)
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{
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switch (channel) {
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case DA9150_GPADC_CHAN_VBAT:
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*val = 2932;
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*val2 = 1000;
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return IIO_VAL_FRACTIONAL;
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case DA9150_GPADC_CHAN_TJUNC_CORE:
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case DA9150_GPADC_CHAN_TJUNC_OVP:
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*val = 1000000;
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*val2 = 4420;
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return IIO_VAL_FRACTIONAL;
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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 da9150_gpadc_read_offset(int channel, int *val)
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{
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switch (channel) {
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case DA9150_GPADC_CHAN_VBAT:
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*val = 1500000 / 2932;
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return IIO_VAL_INT;
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case DA9150_GPADC_CHAN_TJUNC_CORE:
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case DA9150_GPADC_CHAN_TJUNC_OVP:
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*val = -144;
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return IIO_VAL_INT;
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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 da9150_gpadc_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct da9150_gpadc *gpadc = iio_priv(indio_dev);
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if ((chan->channel < DA9150_GPADC_CHAN_GPIOA) ||
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(chan->channel > DA9150_GPADC_CHAN_TJUNC_OVP))
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return -EINVAL;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_PROCESSED:
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return da9150_gpadc_read_processed(gpadc, chan->channel,
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chan->address, val);
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case IIO_CHAN_INFO_SCALE:
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return da9150_gpadc_read_scale(chan->channel, val, val2);
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case IIO_CHAN_INFO_OFFSET:
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return da9150_gpadc_read_offset(chan->channel, val);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info da9150_gpadc_info = {
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.read_raw = &da9150_gpadc_read_raw,
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.driver_module = THIS_MODULE,
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};
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#define DA9150_GPADC_CHANNEL(_id, _hw_id, _type, chan_info, \
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_ext_name) { \
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.type = _type, \
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.indexed = 1, \
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.channel = DA9150_GPADC_CHAN_##_id, \
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.address = DA9150_GPADC_HW_CHAN_##_hw_id, \
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.info_mask_separate = chan_info, \
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.extend_name = _ext_name, \
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.datasheet_name = #_id, \
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}
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#define DA9150_GPADC_CHANNEL_RAW(_id, _hw_id, _type, _ext_name) \
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DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \
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BIT(IIO_CHAN_INFO_RAW), _ext_name)
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#define DA9150_GPADC_CHANNEL_SCALED(_id, _hw_id, _type, _ext_name) \
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DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \
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BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_OFFSET), \
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_ext_name)
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#define DA9150_GPADC_CHANNEL_PROCESSED(_id, _hw_id, _type, _ext_name) \
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DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \
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BIT(IIO_CHAN_INFO_PROCESSED), _ext_name)
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/* Supported channels */
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static const struct iio_chan_spec da9150_gpadc_channels[] = {
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DA9150_GPADC_CHANNEL_PROCESSED(GPIOA, GPIOA_6V, IIO_VOLTAGE, NULL),
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DA9150_GPADC_CHANNEL_PROCESSED(GPIOB, GPIOB_6V, IIO_VOLTAGE, NULL),
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DA9150_GPADC_CHANNEL_PROCESSED(GPIOC, GPIOC_6V, IIO_VOLTAGE, NULL),
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DA9150_GPADC_CHANNEL_PROCESSED(GPIOD, GPIOD_6V, IIO_VOLTAGE, NULL),
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DA9150_GPADC_CHANNEL_PROCESSED(IBUS, IBUS_SENSE, IIO_CURRENT, "ibus"),
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DA9150_GPADC_CHANNEL_PROCESSED(VBUS, VBUS_DIV_, IIO_VOLTAGE, "vbus"),
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DA9150_GPADC_CHANNEL_PROCESSED(VSYS, VSYS, IIO_VOLTAGE, "vsys"),
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DA9150_GPADC_CHANNEL_SCALED(VBAT, VBAT, IIO_VOLTAGE, "vbat"),
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DA9150_GPADC_CHANNEL_RAW(TBAT, TBAT, IIO_VOLTAGE, "tbat"),
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DA9150_GPADC_CHANNEL_SCALED(TJUNC_CORE, TJUNC_CORE, IIO_TEMP,
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"tjunc_core"),
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DA9150_GPADC_CHANNEL_SCALED(TJUNC_OVP, TJUNC_OVP, IIO_TEMP,
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"tjunc_ovp"),
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};
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/* Default maps used by da9150-charger */
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static struct iio_map da9150_gpadc_default_maps[] = {
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{
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.consumer_dev_name = "da9150-charger",
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.consumer_channel = "CHAN_IBUS",
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.adc_channel_label = "IBUS",
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},
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{
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.consumer_dev_name = "da9150-charger",
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.consumer_channel = "CHAN_VBUS",
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.adc_channel_label = "VBUS",
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},
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{
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.consumer_dev_name = "da9150-charger",
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.consumer_channel = "CHAN_TJUNC",
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.adc_channel_label = "TJUNC_CORE",
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},
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{
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.consumer_dev_name = "da9150-charger",
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.consumer_channel = "CHAN_VBAT",
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.adc_channel_label = "VBAT",
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},
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{},
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};
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static int da9150_gpadc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct da9150 *da9150 = dev_get_drvdata(dev->parent);
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struct da9150_gpadc *gpadc;
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struct iio_dev *indio_dev;
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int irq, ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc));
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if (!indio_dev) {
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dev_err(&pdev->dev, "Failed to allocate IIO device\n");
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return -ENOMEM;
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}
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gpadc = iio_priv(indio_dev);
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platform_set_drvdata(pdev, indio_dev);
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gpadc->da9150 = da9150;
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gpadc->dev = dev;
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mutex_init(&gpadc->lock);
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init_completion(&gpadc->complete);
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irq = platform_get_irq_byname(pdev, "GPADC");
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if (irq < 0) {
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dev_err(dev, "Failed to get IRQ: %d\n", irq);
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return irq;
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}
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ret = devm_request_threaded_irq(dev, irq, NULL, da9150_gpadc_irq,
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IRQF_ONESHOT, "GPADC", gpadc);
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if (ret) {
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dev_err(dev, "Failed to request IRQ %d: %d\n", irq, ret);
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return ret;
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}
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ret = iio_map_array_register(indio_dev, da9150_gpadc_default_maps);
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if (ret) {
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dev_err(dev, "Failed to register IIO maps: %d\n", ret);
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return ret;
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}
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indio_dev->name = dev_name(dev);
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indio_dev->dev.parent = dev;
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indio_dev->dev.of_node = pdev->dev.of_node;
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indio_dev->info = &da9150_gpadc_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = da9150_gpadc_channels;
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indio_dev->num_channels = ARRAY_SIZE(da9150_gpadc_channels);
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ret = iio_device_register(indio_dev);
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if (ret) {
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dev_err(dev, "Failed to register IIO device: %d\n", ret);
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goto iio_map_unreg;
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}
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return 0;
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iio_map_unreg:
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iio_map_array_unregister(indio_dev);
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return ret;
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}
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static int da9150_gpadc_remove(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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iio_device_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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return 0;
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}
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static struct platform_driver da9150_gpadc_driver = {
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.driver = {
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.name = "da9150-gpadc",
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},
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.probe = da9150_gpadc_probe,
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.remove = da9150_gpadc_remove,
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};
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module_platform_driver(da9150_gpadc_driver);
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MODULE_DESCRIPTION("GPADC Driver for DA9150");
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MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>");
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MODULE_LICENSE("GPL");
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