-/*
- * TI Bandgap temperature sensor driver
- *
- * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
- * Author: J Keerthy <j-keerthy@ti.com>
- * Author: Moiz Sonasath <m-sonasath@ti.com>
- * Couple of fixes, DT and MFD adaptation:
- * Eduardo Valentin <eduardo.valentin@ti.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that 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, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
- */
-
-#include <linux/module.h>
-#include <linux/export.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/clk.h>
-#include <linux/gpio.h>
-#include <linux/platform_device.h>
-#include <linux/err.h>
-#include <linux/types.h>
-#include <linux/spinlock.h>
-#include <linux/reboot.h>
-#include <linux/of_device.h>
-#include <linux/of_platform.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-
-#include "ti-bandgap.h"
-
-/*** Helper functions to access registers and their bitfields ***/
-
-/**
- * ti_bandgap_readl() - simple read helper function
- * @bgp: pointer to ti_bandgap structure
- * @reg: desired register (offset) to be read
- *
- * Helper function to read bandgap registers. It uses the io remapped area.
- * Return: the register value.
- */
-static u32 ti_bandgap_readl(struct ti_bandgap *bgp, u32 reg)
-{
- return readl(bgp->base + reg);
-}
-
-/**
- * ti_bandgap_writel() - simple write helper function
- * @bgp: pointer to ti_bandgap structure
- * @val: desired register value to be written
- * @reg: desired register (offset) to be written
- *
- * Helper function to write bandgap registers. It uses the io remapped area.
- */
-static void ti_bandgap_writel(struct ti_bandgap *bgp, u32 val, u32 reg)
-{
- writel(val, bgp->base + reg);
-}
-
-/**
- * DOC: macro to update bits.
- *
- * RMW_BITS() - used to read, modify and update bandgap bitfields.
- * The value passed will be shifted.
- */
-#define RMW_BITS(bgp, id, reg, mask, val) \
-do { \
- struct temp_sensor_registers *t; \
- u32 r; \
- \
- t = bgp->conf->sensors[(id)].registers; \
- r = ti_bandgap_readl(bgp, t->reg); \
- r &= ~t->mask; \
- r |= (val) << __ffs(t->mask); \
- ti_bandgap_writel(bgp, r, t->reg); \
-} while (0)
-
-/*** Basic helper functions ***/
-
-/**
- * ti_bandgap_power() - controls the power state of a bandgap device
- * @bgp: pointer to ti_bandgap structure
- * @on: desired power state (1 - on, 0 - off)
- *
- * Used to power on/off a bandgap device instance. Only used on those
- * that features tempsoff bit.
- *
- * Return: 0 on success, -ENOTSUPP if tempsoff is not supported.
- */
-static int ti_bandgap_power(struct ti_bandgap *bgp, bool on)
-{
- int i, ret = 0;
-
- if (!TI_BANDGAP_HAS(bgp, POWER_SWITCH)) {
- ret = -ENOTSUPP;
- goto exit;
- }
-
- for (i = 0; i < bgp->conf->sensor_count; i++)
- /* active on 0 */
- RMW_BITS(bgp, i, temp_sensor_ctrl, bgap_tempsoff_mask, !on);
-
-exit:
- return ret;
-}
-
-/**
- * ti_bandgap_read_temp() - helper function to read sensor temperature
- * @bgp: pointer to ti_bandgap structure
- * @id: bandgap sensor id
- *
- * Function to concentrate the steps to read sensor temperature register.
- * This function is desired because, depending on bandgap device version,
- * it might be needed to freeze the bandgap state machine, before fetching
- * the register value.
- *
- * Return: temperature in ADC values.
- */
-static u32 ti_bandgap_read_temp(struct ti_bandgap *bgp, int id)
-{
- struct temp_sensor_registers *tsr;
- u32 temp, reg;
-
- tsr = bgp->conf->sensors[id].registers;
- reg = tsr->temp_sensor_ctrl;
-
- if (TI_BANDGAP_HAS(bgp, FREEZE_BIT)) {
- RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 1);
- /*
- * In case we cannot read from cur_dtemp / dtemp_0,
- * then we read from the last valid temp read
- */
- reg = tsr->ctrl_dtemp_1;
- }
-
- /* read temperature */
- temp = ti_bandgap_readl(bgp, reg);
- temp &= tsr->bgap_dtemp_mask;
-
- if (TI_BANDGAP_HAS(bgp, FREEZE_BIT))
- RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 0);
-
- return temp;
-}
-
-/*** IRQ handlers ***/
-
-/**
- * ti_bandgap_talert_irq_handler() - handles Temperature alert IRQs
- * @irq: IRQ number
- * @data: private data (struct ti_bandgap *)
- *
- * This is the Talert handler. Use it only if bandgap device features
- * HAS(TALERT). This handler goes over all sensors and checks their
- * conditions and acts accordingly. In case there are events pending,
- * it will reset the event mask to wait for the opposite event (next event).
- * Every time there is a new event, it will be reported to thermal layer.
- *
- * Return: IRQ_HANDLED
- */
-static irqreturn_t ti_bandgap_talert_irq_handler(int irq, void *data)
-{
- struct ti_bandgap *bgp = data;
- struct temp_sensor_registers *tsr;
- u32 t_hot = 0, t_cold = 0, ctrl;
- int i;
-
- spin_lock(&bgp->lock);
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- tsr = bgp->conf->sensors[i].registers;
- ctrl = ti_bandgap_readl(bgp, tsr->bgap_status);
-
- /* Read the status of t_hot */
- t_hot = ctrl & tsr->status_hot_mask;
-
- /* Read the status of t_cold */
- t_cold = ctrl & tsr->status_cold_mask;
-
- if (!t_cold && !t_hot)
- continue;
-
- ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
- /*
- * One TALERT interrupt: Two sources
- * If the interrupt is due to t_hot then mask t_hot and
- * and unmask t_cold else mask t_cold and unmask t_hot
- */
- if (t_hot) {
- ctrl &= ~tsr->mask_hot_mask;
- ctrl |= tsr->mask_cold_mask;
- } else if (t_cold) {
- ctrl &= ~tsr->mask_cold_mask;
- ctrl |= tsr->mask_hot_mask;
- }
-
- ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl);
-
- dev_dbg(bgp->dev,
- "%s: IRQ from %s sensor: hotevent %d coldevent %d\n",
- __func__, bgp->conf->sensors[i].domain,
- t_hot, t_cold);
-
- /* report temperature to whom may concern */
- if (bgp->conf->report_temperature)
- bgp->conf->report_temperature(bgp, i);
- }
- spin_unlock(&bgp->lock);
-
- return IRQ_HANDLED;
-}
-
-/**
- * ti_bandgap_tshut_irq_handler() - handles Temperature shutdown signal
- * @irq: IRQ number
- * @data: private data (unused)
- *
- * This is the Tshut handler. Use it only if bandgap device features
- * HAS(TSHUT). If any sensor fires the Tshut signal, we simply shutdown
- * the system.
- *
- * Return: IRQ_HANDLED
- */
-static irqreturn_t ti_bandgap_tshut_irq_handler(int irq, void *data)
-{
- pr_emerg("%s: TSHUT temperature reached. Needs shut down...\n",
- __func__);
-
- orderly_poweroff(true);
-
- return IRQ_HANDLED;
-}
-
-/*** Helper functions which manipulate conversion ADC <-> mi Celsius ***/
-
-/**
- * ti_bandgap_adc_to_mcelsius() - converts an ADC value to mCelsius scale
- * @bgp: struct ti_bandgap pointer
- * @adc_val: value in ADC representation
- * @t: address where to write the resulting temperature in mCelsius
- *
- * Simple conversion from ADC representation to mCelsius. In case the ADC value
- * is out of the ADC conv table range, it returns -ERANGE, 0 on success.
- * The conversion table is indexed by the ADC values.
- *
- * Return: 0 if conversion was successful, else -ERANGE in case the @adc_val
- * argument is out of the ADC conv table range.
- */
-static
-int ti_bandgap_adc_to_mcelsius(struct ti_bandgap *bgp, int adc_val, int *t)
-{
- const struct ti_bandgap_data *conf = bgp->conf;
- int ret = 0;
-
- /* look up for temperature in the table and return the temperature */
- if (adc_val < conf->adc_start_val || adc_val > conf->adc_end_val) {
- ret = -ERANGE;
- goto exit;
- }
-
- *t = bgp->conf->conv_table[adc_val - conf->adc_start_val];
-
-exit:
- return ret;
-}
-
-/**
- * ti_bandgap_mcelsius_to_adc() - converts a mCelsius value to ADC scale
- * @bgp: struct ti_bandgap pointer
- * @temp: value in mCelsius
- * @adc: address where to write the resulting temperature in ADC representation
- *
- * Simple conversion from mCelsius to ADC values. In case the temp value
- * is out of the ADC conv table range, it returns -ERANGE, 0 on success.
- * The conversion table is indexed by the ADC values.
- *
- * Return: 0 if conversion was successful, else -ERANGE in case the @temp
- * argument is out of the ADC conv table range.
- */
-static
-int ti_bandgap_mcelsius_to_adc(struct ti_bandgap *bgp, long temp, int *adc)
-{
- const struct ti_bandgap_data *conf = bgp->conf;
- const int *conv_table = bgp->conf->conv_table;
- int high, low, mid, ret = 0;
-
- low = 0;
- high = conf->adc_end_val - conf->adc_start_val;
- mid = (high + low) / 2;
-
- if (temp < conv_table[low] || temp > conv_table[high]) {
- ret = -ERANGE;
- goto exit;
- }
-
- while (low < high) {
- if (temp < conv_table[mid])
- high = mid - 1;
- else
- low = mid + 1;
- mid = (low + high) / 2;
- }
-
- *adc = conf->adc_start_val + low;
-
-exit:
- return ret;
-}
-
-/**
- * ti_bandgap_add_hyst() - add hysteresis (in mCelsius) to an ADC value
- * @bgp: struct ti_bandgap pointer
- * @adc_val: temperature value in ADC representation
- * @hyst_val: hysteresis value in mCelsius
- * @sum: address where to write the resulting temperature (in ADC scale)
- *
- * Adds an hysteresis value (in mCelsius) to a ADC temperature value.
- *
- * Return: 0 on success, -ERANGE otherwise.
- */
-static
-int ti_bandgap_add_hyst(struct ti_bandgap *bgp, int adc_val, int hyst_val,
- u32 *sum)
-{
- int temp, ret;
-
- /*
- * Need to add in the mcelsius domain, so we have a temperature
- * the conv_table range
- */
- ret = ti_bandgap_adc_to_mcelsius(bgp, adc_val, &temp);
- if (ret < 0)
- goto exit;
-
- temp += hyst_val;
-
- ret = ti_bandgap_mcelsius_to_adc(bgp, temp, sum);
-
-exit:
- return ret;
-}
-
-/*** Helper functions handling device Alert/Shutdown signals ***/
-
-/**
- * ti_bandgap_unmask_interrupts() - unmasks the events of thot & tcold
- * @bgp: struct ti_bandgap pointer
- * @id: bandgap sensor id
- * @t_hot: hot temperature value to trigger alert signal
- * @t_cold: cold temperature value to trigger alert signal
- *
- * Checks the requested t_hot and t_cold values and configures the IRQ event
- * masks accordingly. Call this function only if bandgap features HAS(TALERT).
- */
-static void ti_bandgap_unmask_interrupts(struct ti_bandgap *bgp, int id,
- u32 t_hot, u32 t_cold)
-{
- struct temp_sensor_registers *tsr;
- u32 temp, reg_val;
-
- /* Read the current on die temperature */
- temp = ti_bandgap_read_temp(bgp, id);
-
- tsr = bgp->conf->sensors[id].registers;
- reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
-
- if (temp < t_hot)
- reg_val |= tsr->mask_hot_mask;
- else
- reg_val &= ~tsr->mask_hot_mask;
-
- if (t_cold < temp)
- reg_val |= tsr->mask_cold_mask;
- else
- reg_val &= ~tsr->mask_cold_mask;
- ti_bandgap_writel(bgp, reg_val, tsr->bgap_mask_ctrl);
-}
-
-/**
- * ti_bandgap_update_alert_threshold() - sequence to update thresholds
- * @bgp: struct ti_bandgap pointer
- * @id: bandgap sensor id
- * @val: value (ADC) of a new threshold
- * @hot: desired threshold to be updated. true if threshold hot, false if
- * threshold cold
- *
- * It will program the required thresholds (hot and cold) for TALERT signal.
- * This function can be used to update t_hot or t_cold, depending on @hot value.
- * It checks the resulting t_hot and t_cold values, based on the new passed @val
- * and configures the thresholds so that t_hot is always greater than t_cold.
- * Call this function only if bandgap features HAS(TALERT).
- *
- * Return: 0 if no error, else corresponding error
- */
-static int ti_bandgap_update_alert_threshold(struct ti_bandgap *bgp, int id,
- int val, bool hot)
-{
- struct temp_sensor_data *ts_data = bgp->conf->sensors[id].ts_data;
- struct temp_sensor_registers *tsr;
- u32 thresh_val, reg_val, t_hot, t_cold;
- int err = 0;
-
- tsr = bgp->conf->sensors[id].registers;
-
- /* obtain the current value */
- thresh_val = ti_bandgap_readl(bgp, tsr->bgap_threshold);
- t_cold = (thresh_val & tsr->threshold_tcold_mask) >>
- __ffs(tsr->threshold_tcold_mask);
- t_hot = (thresh_val & tsr->threshold_thot_mask) >>
- __ffs(tsr->threshold_thot_mask);
- if (hot)
- t_hot = val;
- else
- t_cold = val;
-
- if (t_cold > t_hot) {
- if (hot)
- err = ti_bandgap_add_hyst(bgp, t_hot,
- -ts_data->hyst_val,
- &t_cold);
- else
- err = ti_bandgap_add_hyst(bgp, t_cold,
- ts_data->hyst_val,
- &t_hot);
- }
-
- /* write the new threshold values */
- reg_val = thresh_val &
- ~(tsr->threshold_thot_mask | tsr->threshold_tcold_mask);
- reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask)) |
- (t_cold << __ffs(tsr->threshold_tcold_mask));
- ti_bandgap_writel(bgp, reg_val, tsr->bgap_threshold);
-
- if (err) {
- dev_err(bgp->dev, "failed to reprogram thot threshold\n");
- err = -EIO;
- goto exit;
- }
-
- ti_bandgap_unmask_interrupts(bgp, id, t_hot, t_cold);
-exit:
- return err;
-}
-
-/**
- * ti_bandgap_validate() - helper to check the sanity of a struct ti_bandgap
- * @bgp: struct ti_bandgap pointer
- * @id: bandgap sensor id
- *
- * Checks if the bandgap pointer is valid and if the sensor id is also
- * applicable.
- *
- * Return: 0 if no errors, -EINVAL for invalid @bgp pointer or -ERANGE if
- * @id cannot index @bgp sensors.
- */
-static inline int ti_bandgap_validate(struct ti_bandgap *bgp, int id)
-{
- int ret = 0;
-
- if (IS_ERR_OR_NULL(bgp)) {
- pr_err("%s: invalid bandgap pointer\n", __func__);
- ret = -EINVAL;
- goto exit;
- }
-
- if ((id < 0) || (id >= bgp->conf->sensor_count)) {
- dev_err(bgp->dev, "%s: sensor id out of range (%d)\n",
- __func__, id);
- ret = -ERANGE;
- }
-
-exit:
- return ret;
-}
-
-/**
- * _ti_bandgap_write_threshold() - helper to update TALERT t_cold or t_hot
- * @bgp: struct ti_bandgap pointer
- * @id: bandgap sensor id
- * @val: value (mCelsius) of a new threshold
- * @hot: desired threshold to be updated. true if threshold hot, false if
- * threshold cold
- *
- * It will update the required thresholds (hot and cold) for TALERT signal.
- * This function can be used to update t_hot or t_cold, depending on @hot value.
- * Validates the mCelsius range and update the requested threshold.
- * Call this function only if bandgap features HAS(TALERT).
- *
- * Return: 0 if no error, else corresponding error value.
- */
-static int _ti_bandgap_write_threshold(struct ti_bandgap *bgp, int id, int val,
- bool hot)
-{
- struct temp_sensor_data *ts_data;
- struct temp_sensor_registers *tsr;
- u32 adc_val;
- int ret;
-
- ret = ti_bandgap_validate(bgp, id);
- if (ret)
- goto exit;
-
- if (!TI_BANDGAP_HAS(bgp, TALERT)) {
- ret = -ENOTSUPP;
- goto exit;
- }
-
- ts_data = bgp->conf->sensors[id].ts_data;
- tsr = bgp->conf->sensors[id].registers;
- if (hot) {
- if (val < ts_data->min_temp + ts_data->hyst_val)
- ret = -EINVAL;
- } else {
- if (val > ts_data->max_temp + ts_data->hyst_val)
- ret = -EINVAL;
- }
-
- if (ret)
- goto exit;
-
- ret = ti_bandgap_mcelsius_to_adc(bgp, val, &adc_val);
- if (ret < 0)
- goto exit;
-
- spin_lock(&bgp->lock);
- ret = ti_bandgap_update_alert_threshold(bgp, id, adc_val, hot);
- spin_unlock(&bgp->lock);
-
-exit:
- return ret;
-}
-
-/**
- * _ti_bandgap_read_threshold() - helper to read TALERT t_cold or t_hot
- * @bgp: struct ti_bandgap pointer
- * @id: bandgap sensor id
- * @val: value (mCelsius) of a threshold
- * @hot: desired threshold to be read. true if threshold hot, false if
- * threshold cold
- *
- * It will fetch the required thresholds (hot and cold) for TALERT signal.
- * This function can be used to read t_hot or t_cold, depending on @hot value.
- * Call this function only if bandgap features HAS(TALERT).
- *
- * Return: 0 if no error, -ENOTSUPP if it has no TALERT support, or the
- * corresponding error value if some operation fails.
- */
-static int _ti_bandgap_read_threshold(struct ti_bandgap *bgp, int id,
- int *val, bool hot)
-{
- struct temp_sensor_registers *tsr;
- u32 temp, mask;
- int ret = 0;
-
- ret = ti_bandgap_validate(bgp, id);
- if (ret)
- goto exit;
-
- if (!TI_BANDGAP_HAS(bgp, TALERT)) {
- ret = -ENOTSUPP;
- goto exit;
- }
-
- tsr = bgp->conf->sensors[id].registers;
- if (hot)
- mask = tsr->threshold_thot_mask;
- else
- mask = tsr->threshold_tcold_mask;
-
- temp = ti_bandgap_readl(bgp, tsr->bgap_threshold);
- temp = (temp & mask) >> __ffs(mask);
- ret |= ti_bandgap_adc_to_mcelsius(bgp, temp, &temp);
- if (ret) {
- dev_err(bgp->dev, "failed to read thot\n");
- ret = -EIO;
- goto exit;
- }
-
- *val = temp;
-
-exit:
- return ret;
-}
-
-/*** Exposed APIs ***/
-
-/**
- * ti_bandgap_read_thot() - reads sensor current thot
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @thot: resulting current thot value
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_read_thot(struct ti_bandgap *bgp, int id, int *thot)
-{
- return _ti_bandgap_read_threshold(bgp, id, thot, true);
-}
-
-/**
- * ti_bandgap_write_thot() - sets sensor current thot
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @val: desired thot value
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_write_thot(struct ti_bandgap *bgp, int id, int val)
-{
- return _ti_bandgap_write_threshold(bgp, id, val, true);
-}
-
-/**
- * ti_bandgap_read_tcold() - reads sensor current tcold
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @tcold: resulting current tcold value
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_read_tcold(struct ti_bandgap *bgp, int id, int *tcold)
-{
- return _ti_bandgap_read_threshold(bgp, id, tcold, false);
-}
-
-/**
- * ti_bandgap_write_tcold() - sets the sensor tcold
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @val: desired tcold value
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_write_tcold(struct ti_bandgap *bgp, int id, int val)
-{
- return _ti_bandgap_write_threshold(bgp, id, val, false);
-}
-
-/**
- * ti_bandgap_read_counter() - read the sensor counter
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @interval: resulting update interval in miliseconds
- */
-static void ti_bandgap_read_counter(struct ti_bandgap *bgp, int id,
- int *interval)
-{
- struct temp_sensor_registers *tsr;
- int time;
-
- tsr = bgp->conf->sensors[id].registers;
- time = ti_bandgap_readl(bgp, tsr->bgap_counter);
- time = (time & tsr->counter_mask) >>
- __ffs(tsr->counter_mask);
- time = time * 1000 / bgp->clk_rate;
- *interval = time;
-}
-
-/**
- * ti_bandgap_read_counter_delay() - read the sensor counter delay
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @interval: resulting update interval in miliseconds
- */
-static void ti_bandgap_read_counter_delay(struct ti_bandgap *bgp, int id,
- int *interval)
-{
- struct temp_sensor_registers *tsr;
- int reg_val;
-
- tsr = bgp->conf->sensors[id].registers;
-
- reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
- reg_val = (reg_val & tsr->mask_counter_delay_mask) >>
- __ffs(tsr->mask_counter_delay_mask);
- switch (reg_val) {
- case 0:
- *interval = 0;
- break;
- case 1:
- *interval = 1;
- break;
- case 2:
- *interval = 10;
- break;
- case 3:
- *interval = 100;
- break;
- case 4:
- *interval = 250;
- break;
- case 5:
- *interval = 500;
- break;
- default:
- dev_warn(bgp->dev, "Wrong counter delay value read from register %X",
- reg_val);
- }
-}
-
-/**
- * ti_bandgap_read_update_interval() - read the sensor update interval
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @interval: resulting update interval in miliseconds
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id,
- int *interval)
-{
- int ret = 0;
-
- ret = ti_bandgap_validate(bgp, id);
- if (ret)
- goto exit;
-
- if (!TI_BANDGAP_HAS(bgp, COUNTER) &&
- !TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) {
- ret = -ENOTSUPP;
- goto exit;
- }
-
- if (TI_BANDGAP_HAS(bgp, COUNTER)) {
- ti_bandgap_read_counter(bgp, id, interval);
- goto exit;
- }
-
- ti_bandgap_read_counter_delay(bgp, id, interval);
-exit:
- return ret;
-}
-
-/**
- * ti_bandgap_write_counter_delay() - set the counter_delay
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @interval: desired update interval in miliseconds
- *
- * Return: 0 on success or the proper error code
- */
-static int ti_bandgap_write_counter_delay(struct ti_bandgap *bgp, int id,
- u32 interval)
-{
- int rval;
-
- switch (interval) {
- case 0: /* Immediate conversion */
- rval = 0x0;
- break;
- case 1: /* Conversion after ever 1ms */
- rval = 0x1;
- break;
- case 10: /* Conversion after ever 10ms */
- rval = 0x2;
- break;
- case 100: /* Conversion after ever 100ms */
- rval = 0x3;
- break;
- case 250: /* Conversion after ever 250ms */
- rval = 0x4;
- break;
- case 500: /* Conversion after ever 500ms */
- rval = 0x5;
- break;
- default:
- dev_warn(bgp->dev, "Delay %d ms is not supported\n", interval);
- return -EINVAL;
- }
-
- spin_lock(&bgp->lock);
- RMW_BITS(bgp, id, bgap_mask_ctrl, mask_counter_delay_mask, rval);
- spin_unlock(&bgp->lock);
-
- return 0;
-}
-
-/**
- * ti_bandgap_write_counter() - set the bandgap sensor counter
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @interval: desired update interval in miliseconds
- */
-static void ti_bandgap_write_counter(struct ti_bandgap *bgp, int id,
- u32 interval)
-{
- interval = interval * bgp->clk_rate / 1000;
- spin_lock(&bgp->lock);
- RMW_BITS(bgp, id, bgap_counter, counter_mask, interval);
- spin_unlock(&bgp->lock);
-}
-
-/**
- * ti_bandgap_write_update_interval() - set the update interval
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @interval: desired update interval in miliseconds
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_write_update_interval(struct ti_bandgap *bgp,
- int id, u32 interval)
-{
- int ret = ti_bandgap_validate(bgp, id);
- if (ret)
- goto exit;
-
- if (!TI_BANDGAP_HAS(bgp, COUNTER) &&
- !TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) {
- ret = -ENOTSUPP;
- goto exit;
- }
-
- if (TI_BANDGAP_HAS(bgp, COUNTER)) {
- ti_bandgap_write_counter(bgp, id, interval);
- goto exit;
- }
-
- ret = ti_bandgap_write_counter_delay(bgp, id, interval);
-exit:
- return ret;
-}
-
-/**
- * ti_bandgap_read_temperature() - report current temperature
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @temperature: resulting temperature
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id,
- int *temperature)
-{
- u32 temp;
- int ret;
-
- ret = ti_bandgap_validate(bgp, id);
- if (ret)
- return ret;
-
- spin_lock(&bgp->lock);
- temp = ti_bandgap_read_temp(bgp, id);
- spin_unlock(&bgp->lock);
-
- ret |= ti_bandgap_adc_to_mcelsius(bgp, temp, &temp);
- if (ret)
- return -EIO;
-
- *temperature = temp;
-
- return 0;
-}
-
-/**
- * ti_bandgap_set_sensor_data() - helper function to store thermal
- * framework related data.
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- * @data: thermal framework related data to be stored
- *
- * Return: 0 on success or the proper error code
- */
-int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data)
-{
- int ret = ti_bandgap_validate(bgp, id);
- if (ret)
- return ret;
-
- bgp->regval[id].data = data;
-
- return 0;
-}
-
-/**
- * ti_bandgap_get_sensor_data() - helper function to get thermal
- * framework related data.
- * @bgp: pointer to bandgap instance
- * @id: sensor id
- *
- * Return: data stored by set function with sensor id on success or NULL
- */
-void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id)
-{
- int ret = ti_bandgap_validate(bgp, id);
- if (ret)
- return ERR_PTR(ret);
-
- return bgp->regval[id].data;
-}
-
-/*** Helper functions used during device initialization ***/
-
-/**
- * ti_bandgap_force_single_read() - executes 1 single ADC conversion
- * @bgp: pointer to struct ti_bandgap
- * @id: sensor id which it is desired to read 1 temperature
- *
- * Used to initialize the conversion state machine and set it to a valid
- * state. Called during device initialization and context restore events.
- *
- * Return: 0
- */
-static int
-ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
-{
- u32 temp = 0, counter = 1000;
-
- /* Select single conversion mode */
- if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
- RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 0);
-
- /* Start of Conversion = 1 */
- RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 1);
- /* Wait until DTEMP is updated */
- temp = ti_bandgap_read_temp(bgp, id);
-
- while ((temp == 0) && --counter)
- temp = ti_bandgap_read_temp(bgp, id);
- /* REVISIT: Check correct condition for end of conversion */
-
- /* Start of Conversion = 0 */
- RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 0);
-
- return 0;
-}
-
-/**
- * ti_bandgap_set_continous_mode() - One time enabling of continuous mode
- * @bgp: pointer to struct ti_bandgap
- *
- * Call this function only if HAS(MODE_CONFIG) is set. As this driver may
- * be used for junction temperature monitoring, it is desirable that the
- * sensors are operational all the time, so that alerts are generated
- * properly.
- *
- * Return: 0
- */
-static int ti_bandgap_set_continuous_mode(struct ti_bandgap *bgp)
-{
- int i;
-
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- /* Perform a single read just before enabling continuous */
- ti_bandgap_force_single_read(bgp, i);
- RMW_BITS(bgp, i, bgap_mode_ctrl, mode_ctrl_mask, 1);
- }
-
- return 0;
-}
-
-/**
- * ti_bandgap_get_trend() - To fetch the temperature trend of a sensor
- * @bgp: pointer to struct ti_bandgap
- * @id: id of the individual sensor
- * @trend: Pointer to trend.
- *
- * This function needs to be called to fetch the temperature trend of a
- * Particular sensor. The function computes the difference in temperature
- * w.r.t time. For the bandgaps with built in history buffer the temperatures
- * are read from the buffer and for those without the Buffer -ENOTSUPP is
- * returned.
- *
- * Return: 0 if no error, else return corresponding error. If no
- * error then the trend value is passed on to trend parameter
- */
-int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend)
-{
- struct temp_sensor_registers *tsr;
- u32 temp1, temp2, reg1, reg2;
- int t1, t2, interval, ret = 0;
-
- ret = ti_bandgap_validate(bgp, id);
- if (ret)
- goto exit;
-
- if (!TI_BANDGAP_HAS(bgp, HISTORY_BUFFER) ||
- !TI_BANDGAP_HAS(bgp, FREEZE_BIT)) {
- ret = -ENOTSUPP;
- goto exit;
- }
-
- tsr = bgp->conf->sensors[id].registers;
-
- /* Freeze and read the last 2 valid readings */
- reg1 = tsr->ctrl_dtemp_1;
- reg2 = tsr->ctrl_dtemp_2;
-
- /* read temperature from history buffer */
- temp1 = ti_bandgap_readl(bgp, reg1);
- temp1 &= tsr->bgap_dtemp_mask;
-
- temp2 = ti_bandgap_readl(bgp, reg2);
- temp2 &= tsr->bgap_dtemp_mask;
-
- /* Convert from adc values to mCelsius temperature */
- ret = ti_bandgap_adc_to_mcelsius(bgp, temp1, &t1);
- if (ret)
- goto exit;
-
- ret = ti_bandgap_adc_to_mcelsius(bgp, temp2, &t2);
- if (ret)
- goto exit;
-
- /* Fetch the update interval */
- ret = ti_bandgap_read_update_interval(bgp, id, &interval);
- if (ret || !interval)
- goto exit;
-
- *trend = (t1 - t2) / interval;
-
- dev_dbg(bgp->dev, "The temperatures are t1 = %d and t2 = %d and trend =%d\n",
- t1, t2, *trend);
-
-exit:
- return ret;
-}
-
-/**
- * ti_bandgap_tshut_init() - setup and initialize tshut handling
- * @bgp: pointer to struct ti_bandgap
- * @pdev: pointer to device struct platform_device
- *
- * Call this function only in case the bandgap features HAS(TSHUT).
- * In this case, the driver needs to handle the TSHUT signal as an IRQ.
- * The IRQ is wired as a GPIO, and for this purpose, it is required
- * to specify which GPIO line is used. TSHUT IRQ is fired anytime
- * one of the bandgap sensors violates the TSHUT high/hot threshold.
- * And in that case, the system must go off.
- *
- * Return: 0 if no error, else error status
- */
-static int ti_bandgap_tshut_init(struct ti_bandgap *bgp,
- struct platform_device *pdev)
-{
- int gpio_nr = bgp->tshut_gpio;
- int status;
-
- /* Request for gpio_86 line */
- status = gpio_request(gpio_nr, "tshut");
- if (status < 0) {
- dev_err(bgp->dev, "Could not request for TSHUT GPIO:%i\n", 86);
- return status;
- }
- status = gpio_direction_input(gpio_nr);
- if (status) {
- dev_err(bgp->dev, "Cannot set input TSHUT GPIO %d\n", gpio_nr);
- return status;
- }
-
- status = request_irq(gpio_to_irq(gpio_nr), ti_bandgap_tshut_irq_handler,
- IRQF_TRIGGER_RISING, "tshut", NULL);
- if (status) {
- gpio_free(gpio_nr);
- dev_err(bgp->dev, "request irq failed for TSHUT");
- }
-
- return 0;
-}
-
-/**
- * ti_bandgap_alert_init() - setup and initialize talert handling
- * @bgp: pointer to struct ti_bandgap
- * @pdev: pointer to device struct platform_device
- *
- * Call this function only in case the bandgap features HAS(TALERT).
- * In this case, the driver needs to handle the TALERT signals as an IRQs.
- * TALERT is a normal IRQ and it is fired any time thresholds (hot or cold)
- * are violated. In these situation, the driver must reprogram the thresholds,
- * accordingly to specified policy.
- *
- * Return: 0 if no error, else return corresponding error.
- */
-static int ti_bandgap_talert_init(struct ti_bandgap *bgp,
- struct platform_device *pdev)
-{
- int ret;
-
- bgp->irq = platform_get_irq(pdev, 0);
- if (bgp->irq < 0) {
- dev_err(&pdev->dev, "get_irq failed\n");
- return bgp->irq;
- }
- ret = request_threaded_irq(bgp->irq, NULL,
- ti_bandgap_talert_irq_handler,
- IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
- "talert", bgp);
- if (ret) {
- dev_err(&pdev->dev, "Request threaded irq failed.\n");
- return ret;
- }
-
- return 0;
-}
-
-static const struct of_device_id of_ti_bandgap_match[];
-/**
- * ti_bandgap_build() - parse DT and setup a struct ti_bandgap
- * @pdev: pointer to device struct platform_device
- *
- * Used to read the device tree properties accordingly to the bandgap
- * matching version. Based on bandgap version and its capabilities it
- * will build a struct ti_bandgap out of the required DT entries.
- *
- * Return: valid bandgap structure if successful, else returns ERR_PTR
- * return value must be verified with IS_ERR.
- */
-static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev)
-{
- struct device_node *node = pdev->dev.of_node;
- const struct of_device_id *of_id;
- struct ti_bandgap *bgp;
- struct resource *res;
- u32 prop;
- int i;
-
- /* just for the sake */
- if (!node) {
- dev_err(&pdev->dev, "no platform information available\n");
- return ERR_PTR(-EINVAL);
- }
-
- bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);
- if (!bgp) {
- dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
- return ERR_PTR(-ENOMEM);
- }
-
- of_id = of_match_device(of_ti_bandgap_match, &pdev->dev);
- if (of_id)
- bgp->conf = of_id->data;
-
- /* register shadow for context save and restore */
- bgp->regval = devm_kzalloc(&pdev->dev, sizeof(*bgp->regval) *
- bgp->conf->sensor_count, GFP_KERNEL);
- if (!bgp) {
- dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
- return ERR_PTR(-ENOMEM);
- }
-
- i = 0;
- do {
- void __iomem *chunk;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, i);
- if (!res)
- break;
- chunk = devm_ioremap_resource(&pdev->dev, res);
- if (i == 0)
- bgp->base = chunk;
- if (IS_ERR(chunk))
- return ERR_CAST(chunk);
-
- i++;
- } while (res);
-
- if (TI_BANDGAP_HAS(bgp, TSHUT)) {
- if (of_property_read_u32(node, "ti,tshut-gpio", &prop) < 0) {
- dev_err(&pdev->dev, "missing tshut gpio in device tree\n");
- return ERR_PTR(-EINVAL);
- }
- bgp->tshut_gpio = prop;
- if (!gpio_is_valid(bgp->tshut_gpio)) {
- dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
- bgp->tshut_gpio);
- return ERR_PTR(-EINVAL);
- }
- }
-
- return bgp;
-}
-
-/*** Device driver call backs ***/
-
-static
-int ti_bandgap_probe(struct platform_device *pdev)
-{
- struct ti_bandgap *bgp;
- int clk_rate, ret = 0, i;
-
- bgp = ti_bandgap_build(pdev);
- if (IS_ERR_OR_NULL(bgp)) {
- dev_err(&pdev->dev, "failed to fetch platform data\n");
- return PTR_ERR(bgp);
- }
- bgp->dev = &pdev->dev;
-
- if (TI_BANDGAP_HAS(bgp, TSHUT)) {
- ret = ti_bandgap_tshut_init(bgp, pdev);
- if (ret) {
- dev_err(&pdev->dev,
- "failed to initialize system tshut IRQ\n");
- return ret;
- }
- }
-
- bgp->fclock = clk_get(NULL, bgp->conf->fclock_name);
- ret = IS_ERR_OR_NULL(bgp->fclock);
- if (ret) {
- dev_err(&pdev->dev, "failed to request fclock reference\n");
- goto free_irqs;
- }
-
- bgp->div_clk = clk_get(NULL, bgp->conf->div_ck_name);
- ret = IS_ERR_OR_NULL(bgp->div_clk);
- if (ret) {
- dev_err(&pdev->dev,
- "failed to request div_ts_ck clock ref\n");
- goto free_irqs;
- }
-
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- struct temp_sensor_registers *tsr;
- u32 val;
-
- tsr = bgp->conf->sensors[i].registers;
- /*
- * check if the efuse has a non-zero value if not
- * it is an untrimmed sample and the temperatures
- * may not be accurate
- */
- val = ti_bandgap_readl(bgp, tsr->bgap_efuse);
- if (ret || !val)
- dev_info(&pdev->dev,
- "Non-trimmed BGAP, Temp not accurate\n");
- }
-
- clk_rate = clk_round_rate(bgp->div_clk,
- bgp->conf->sensors[0].ts_data->max_freq);
- if (clk_rate < bgp->conf->sensors[0].ts_data->min_freq ||
- clk_rate == 0xffffffff) {
- ret = -ENODEV;
- dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
- goto put_clks;
- }
-
- ret = clk_set_rate(bgp->div_clk, clk_rate);
- if (ret)
- dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
-
- bgp->clk_rate = clk_rate;
- if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
- clk_prepare_enable(bgp->fclock);
-
-
- spin_lock_init(&bgp->lock);
- bgp->dev = &pdev->dev;
- platform_set_drvdata(pdev, bgp);
-
- ti_bandgap_power(bgp, true);
-
- /* Set default counter to 1 for now */
- if (TI_BANDGAP_HAS(bgp, COUNTER))
- for (i = 0; i < bgp->conf->sensor_count; i++)
- RMW_BITS(bgp, i, bgap_counter, counter_mask, 1);
-
- /* Set default thresholds for alert and shutdown */
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- struct temp_sensor_data *ts_data;
-
- ts_data = bgp->conf->sensors[i].ts_data;
-
- if (TI_BANDGAP_HAS(bgp, TALERT)) {
- /* Set initial Talert thresholds */
- RMW_BITS(bgp, i, bgap_threshold,
- threshold_tcold_mask, ts_data->t_cold);
- RMW_BITS(bgp, i, bgap_threshold,
- threshold_thot_mask, ts_data->t_hot);
- /* Enable the alert events */
- RMW_BITS(bgp, i, bgap_mask_ctrl, mask_hot_mask, 1);
- RMW_BITS(bgp, i, bgap_mask_ctrl, mask_cold_mask, 1);
- }
-
- if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG)) {
- /* Set initial Tshut thresholds */
- RMW_BITS(bgp, i, tshut_threshold,
- tshut_hot_mask, ts_data->tshut_hot);
- RMW_BITS(bgp, i, tshut_threshold,
- tshut_cold_mask, ts_data->tshut_cold);
- }
- }
-
- if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
- ti_bandgap_set_continuous_mode(bgp);
-
- /* Set .250 seconds time as default counter */
- if (TI_BANDGAP_HAS(bgp, COUNTER))
- for (i = 0; i < bgp->conf->sensor_count; i++)
- RMW_BITS(bgp, i, bgap_counter, counter_mask,
- bgp->clk_rate / 4);
-
- /* Every thing is good? Then expose the sensors */
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- char *domain;
-
- if (bgp->conf->sensors[i].register_cooling) {
- ret = bgp->conf->sensors[i].register_cooling(bgp, i);
- if (ret)
- goto remove_sensors;
- }
-
- if (bgp->conf->expose_sensor) {
- domain = bgp->conf->sensors[i].domain;
- ret = bgp->conf->expose_sensor(bgp, i, domain);
- if (ret)
- goto remove_last_cooling;
- }
- }
-
- /*
- * Enable the Interrupts once everything is set. Otherwise irq handler
- * might be called as soon as it is enabled where as rest of framework
- * is still getting initialised.
- */
- if (TI_BANDGAP_HAS(bgp, TALERT)) {
- ret = ti_bandgap_talert_init(bgp, pdev);
- if (ret) {
- dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
- i = bgp->conf->sensor_count;
- goto disable_clk;
- }
- }
-
- return 0;
-
-remove_last_cooling:
- if (bgp->conf->sensors[i].unregister_cooling)
- bgp->conf->sensors[i].unregister_cooling(bgp, i);
-remove_sensors:
- for (i--; i >= 0; i--) {
- if (bgp->conf->sensors[i].unregister_cooling)
- bgp->conf->sensors[i].unregister_cooling(bgp, i);
- if (bgp->conf->remove_sensor)
- bgp->conf->remove_sensor(bgp, i);
- }
- ti_bandgap_power(bgp, false);
-disable_clk:
- if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
- clk_disable_unprepare(bgp->fclock);
-put_clks:
- clk_put(bgp->fclock);
- clk_put(bgp->div_clk);
-free_irqs:
- if (TI_BANDGAP_HAS(bgp, TSHUT)) {
- free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
- gpio_free(bgp->tshut_gpio);
- }
-
- return ret;
-}
-
-static
-int ti_bandgap_remove(struct platform_device *pdev)
-{
- struct ti_bandgap *bgp = platform_get_drvdata(pdev);
- int i;
-
- /* First thing is to remove sensor interfaces */
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- if (bgp->conf->sensors[i].unregister_cooling)
- bgp->conf->sensors[i].unregister_cooling(bgp, i);
-
- if (bgp->conf->remove_sensor)
- bgp->conf->remove_sensor(bgp, i);
- }
-
- ti_bandgap_power(bgp, false);
-
- if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
- clk_disable_unprepare(bgp->fclock);
- clk_put(bgp->fclock);
- clk_put(bgp->div_clk);
-
- if (TI_BANDGAP_HAS(bgp, TALERT))
- free_irq(bgp->irq, bgp);
-
- if (TI_BANDGAP_HAS(bgp, TSHUT)) {
- free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
- gpio_free(bgp->tshut_gpio);
- }
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int ti_bandgap_save_ctxt(struct ti_bandgap *bgp)
-{
- int i;
-
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- struct temp_sensor_registers *tsr;
- struct temp_sensor_regval *rval;
-
- rval = &bgp->regval[i];
- tsr = bgp->conf->sensors[i].registers;
-
- if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
- rval->bg_mode_ctrl = ti_bandgap_readl(bgp,
- tsr->bgap_mode_ctrl);
- if (TI_BANDGAP_HAS(bgp, COUNTER))
- rval->bg_counter = ti_bandgap_readl(bgp,
- tsr->bgap_counter);
- if (TI_BANDGAP_HAS(bgp, TALERT)) {
- rval->bg_threshold = ti_bandgap_readl(bgp,
- tsr->bgap_threshold);
- rval->bg_ctrl = ti_bandgap_readl(bgp,
- tsr->bgap_mask_ctrl);
- }
-
- if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG))
- rval->tshut_threshold = ti_bandgap_readl(bgp,
- tsr->tshut_threshold);
- }
-
- return 0;
-}
-
-static int ti_bandgap_restore_ctxt(struct ti_bandgap *bgp)
-{
- int i;
-
- for (i = 0; i < bgp->conf->sensor_count; i++) {
- struct temp_sensor_registers *tsr;
- struct temp_sensor_regval *rval;
- u32 val = 0;
-
- rval = &bgp->regval[i];
- tsr = bgp->conf->sensors[i].registers;
-
- if (TI_BANDGAP_HAS(bgp, COUNTER))
- val = ti_bandgap_readl(bgp, tsr->bgap_counter);
-
- if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG))
- ti_bandgap_writel(bgp, rval->tshut_threshold,
- tsr->tshut_threshold);
- /* Force immediate temperature measurement and update
- * of the DTEMP field
- */
- ti_bandgap_force_single_read(bgp, i);
-
- if (TI_BANDGAP_HAS(bgp, COUNTER))
- ti_bandgap_writel(bgp, rval->bg_counter,
- tsr->bgap_counter);
- if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
- ti_bandgap_writel(bgp, rval->bg_mode_ctrl,
- tsr->bgap_mode_ctrl);
- if (TI_BANDGAP_HAS(bgp, TALERT)) {
- ti_bandgap_writel(bgp, rval->bg_threshold,
- tsr->bgap_threshold);
- ti_bandgap_writel(bgp, rval->bg_ctrl,
- tsr->bgap_mask_ctrl);
- }
- }
-
- return 0;
-}
-
-static int ti_bandgap_suspend(struct device *dev)
-{
- struct ti_bandgap *bgp = dev_get_drvdata(dev);
- int err;
-
- err = ti_bandgap_save_ctxt(bgp);
- ti_bandgap_power(bgp, false);
-
- if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
- clk_disable_unprepare(bgp->fclock);
-
- return err;
-}
-
-static int ti_bandgap_resume(struct device *dev)
-{
- struct ti_bandgap *bgp = dev_get_drvdata(dev);
-
- if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
- clk_prepare_enable(bgp->fclock);
-
- ti_bandgap_power(bgp, true);
-
- return ti_bandgap_restore_ctxt(bgp);
-}
-static const struct dev_pm_ops ti_bandgap_dev_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(ti_bandgap_suspend,
- ti_bandgap_resume)
-};
-
-#define DEV_PM_OPS (&ti_bandgap_dev_pm_ops)
-#else
-#define DEV_PM_OPS NULL
-#endif
-
-static const struct of_device_id of_ti_bandgap_match[] = {
-#ifdef CONFIG_OMAP4_THERMAL
- {
- .compatible = "ti,omap4430-bandgap",
- .data = (void *)&omap4430_data,
- },
- {
- .compatible = "ti,omap4460-bandgap",
- .data = (void *)&omap4460_data,
- },
- {
- .compatible = "ti,omap4470-bandgap",
- .data = (void *)&omap4470_data,
- },
-#endif
-#ifdef CONFIG_OMAP5_THERMAL
- {
- .compatible = "ti,omap5430-bandgap",
- .data = (void *)&omap5430_data,
- },
-#endif
- /* Sentinel */
- { },
-};
-MODULE_DEVICE_TABLE(of, of_ti_bandgap_match);
-
-static struct platform_driver ti_bandgap_sensor_driver = {
- .probe = ti_bandgap_probe,
- .remove = ti_bandgap_remove,
- .driver = {
- .name = "ti-soc-thermal",
- .pm = DEV_PM_OPS,
- .of_match_table = of_ti_bandgap_match,
- },
-};
-
-module_platform_driver(ti_bandgap_sensor_driver);
-
-MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:ti-soc-thermal");
-MODULE_AUTHOR("Texas Instrument Inc.");