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linux/drivers/mfd/iqs62x.c
Gustavo A. R. Silva df561f6688 treewide: Use fallthrough pseudo-keyword 
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00

1064 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Azoteq IQS620A/621/622/624/625 Multi-Function Sensors
*
* Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
*
* These devices rely on application-specific register settings and calibration
* data developed in and exported from a suite of GUIs offered by the vendor. A
* separate tool converts the GUIs' ASCII-based output into a standard firmware
* file parsed by the driver.
*
* Link to datasheets and GUIs: https://www.azoteq.com/
*
* Link to conversion tool: https://github.com/jlabundy/iqs62x-h2bin.git
*/
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mfd/core.h>
#include <linux/mfd/iqs62x.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#define IQS62X_PROD_NUM 0x00
#define IQS62X_SYS_FLAGS 0x10
#define IQS62X_SYS_FLAGS_IN_ATI BIT(2)
#define IQS620_HALL_FLAGS 0x16
#define IQS621_HALL_FLAGS 0x19
#define IQS622_HALL_FLAGS IQS621_HALL_FLAGS
#define IQS624_INTERVAL_NUM 0x18
#define IQS625_INTERVAL_NUM 0x12
#define IQS622_PROX_SETTINGS_4 0x48
#define IQS620_PROX_SETTINGS_4 0x50
#define IQS620_PROX_SETTINGS_4_SAR_EN BIT(7)
#define IQS621_ALS_CAL_DIV_LUX 0x82
#define IQS621_ALS_CAL_DIV_IR 0x83
#define IQS620_TEMP_CAL_MULT 0xC2
#define IQS620_TEMP_CAL_DIV 0xC3
#define IQS620_TEMP_CAL_OFFS 0xC4
#define IQS62X_SYS_SETTINGS 0xD0
#define IQS62X_SYS_SETTINGS_SOFT_RESET BIT(7)
#define IQS62X_SYS_SETTINGS_ACK_RESET BIT(6)
#define IQS62X_SYS_SETTINGS_EVENT_MODE BIT(5)
#define IQS62X_SYS_SETTINGS_CLK_DIV BIT(4)
#define IQS62X_SYS_SETTINGS_REDO_ATI BIT(1)
#define IQS62X_PWR_SETTINGS 0xD2
#define IQS62X_PWR_SETTINGS_DIS_AUTO BIT(5)
#define IQS62X_PWR_SETTINGS_PWR_MODE_MASK (BIT(4) | BIT(3))
#define IQS62X_PWR_SETTINGS_PWR_MODE_HALT (BIT(4) | BIT(3))
#define IQS62X_PWR_SETTINGS_PWR_MODE_NORM 0
#define IQS62X_OTP_CMD 0xF0
#define IQS62X_OTP_CMD_FG3 0x13
#define IQS62X_OTP_DATA 0xF1
#define IQS62X_MAX_REG 0xFF
#define IQS62X_HALL_CAL_MASK GENMASK(3, 0)
#define IQS62X_FW_REC_TYPE_INFO 0
#define IQS62X_FW_REC_TYPE_PROD 1
#define IQS62X_FW_REC_TYPE_HALL 2
#define IQS62X_FW_REC_TYPE_MASK 3
#define IQS62X_FW_REC_TYPE_DATA 4
#define IQS62X_ATI_POLL_SLEEP_US 10000
#define IQS62X_ATI_POLL_TIMEOUT_US 500000
#define IQS62X_ATI_STABLE_DELAY_MS 150
struct iqs62x_fw_rec {
u8 type;
u8 addr;
u8 len;
u8 data;
} __packed;
struct iqs62x_fw_blk {
struct list_head list;
u8 addr;
u8 mask;
u8 len;
u8 data[];
};
struct iqs62x_info {
u8 prod_num;
u8 sw_num;
u8 hw_num;
} __packed;
static int iqs62x_dev_init(struct iqs62x_core *iqs62x)
{
struct iqs62x_fw_blk *fw_blk;
unsigned int val;
int ret;
u8 clk_div = 1;
list_for_each_entry(fw_blk, &iqs62x->fw_blk_head, list) {
if (fw_blk->mask)
ret = regmap_update_bits(iqs62x->regmap, fw_blk->addr,
fw_blk->mask, *fw_blk->data);
else
ret = regmap_raw_write(iqs62x->regmap, fw_blk->addr,
fw_blk->data, fw_blk->len);
if (ret)
return ret;
}
switch (iqs62x->dev_desc->prod_num) {
case IQS620_PROD_NUM:
case IQS622_PROD_NUM:
ret = regmap_read(iqs62x->regmap,
iqs62x->dev_desc->prox_settings, &val);
if (ret)
return ret;
if (val & IQS620_PROX_SETTINGS_4_SAR_EN)
iqs62x->ui_sel = IQS62X_UI_SAR1;
fallthrough;
case IQS621_PROD_NUM:
ret = regmap_write(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
IQS620_GLBL_EVENT_MASK_PMU |
iqs62x->dev_desc->prox_mask |
iqs62x->dev_desc->sar_mask |
iqs62x->dev_desc->hall_mask |
iqs62x->dev_desc->hyst_mask |
iqs62x->dev_desc->temp_mask |
iqs62x->dev_desc->als_mask |
iqs62x->dev_desc->ir_mask);
if (ret)
return ret;
break;
default:
ret = regmap_write(iqs62x->regmap, IQS624_HALL_UI,
IQS624_HALL_UI_WHL_EVENT |
IQS624_HALL_UI_INT_EVENT |
IQS624_HALL_UI_AUTO_CAL);
if (ret)
return ret;
/*
* The IQS625 default interval divider is below the minimum
* permissible value, and the datasheet mandates that it is
* corrected during initialization (unless an updated value
* has already been provided by firmware).
*
* To protect against an unacceptably low user-entered value
* stored in the firmware, the same check is extended to the
* IQS624 as well.
*/
ret = regmap_read(iqs62x->regmap, IQS624_INTERVAL_DIV, &val);
if (ret)
return ret;
if (val >= iqs62x->dev_desc->interval_div)
break;
ret = regmap_write(iqs62x->regmap, IQS624_INTERVAL_DIV,
iqs62x->dev_desc->interval_div);
if (ret)
return ret;
}
ret = regmap_read(iqs62x->regmap, IQS62X_SYS_SETTINGS, &val);
if (ret)
return ret;
if (val & IQS62X_SYS_SETTINGS_CLK_DIV)
clk_div = iqs62x->dev_desc->clk_div;
ret = regmap_write(iqs62x->regmap, IQS62X_SYS_SETTINGS, val |
IQS62X_SYS_SETTINGS_ACK_RESET |
IQS62X_SYS_SETTINGS_EVENT_MODE |
IQS62X_SYS_SETTINGS_REDO_ATI);
if (ret)
return ret;
ret = regmap_read_poll_timeout(iqs62x->regmap, IQS62X_SYS_FLAGS, val,
!(val & IQS62X_SYS_FLAGS_IN_ATI),
IQS62X_ATI_POLL_SLEEP_US,
IQS62X_ATI_POLL_TIMEOUT_US * clk_div);
if (ret)
return ret;
msleep(IQS62X_ATI_STABLE_DELAY_MS * clk_div);
return 0;
}
static int iqs62x_firmware_parse(struct iqs62x_core *iqs62x,
const struct firmware *fw)
{
struct i2c_client *client = iqs62x->client;
struct iqs62x_fw_rec *fw_rec;
struct iqs62x_fw_blk *fw_blk;
unsigned int val;
size_t pos = 0;
int ret = 0;
u8 mask, len, *data;
u8 hall_cal_index = 0;
while (pos < fw->size) {
if (pos + sizeof(*fw_rec) > fw->size) {
ret = -EINVAL;
break;
}
fw_rec = (struct iqs62x_fw_rec *)(fw->data + pos);
pos += sizeof(*fw_rec);
if (pos + fw_rec->len - 1 > fw->size) {
ret = -EINVAL;
break;
}
pos += fw_rec->len - 1;
switch (fw_rec->type) {
case IQS62X_FW_REC_TYPE_INFO:
continue;
case IQS62X_FW_REC_TYPE_PROD:
if (fw_rec->data == iqs62x->dev_desc->prod_num)
continue;
dev_err(&client->dev,
"Incompatible product number: 0x%02X\n",
fw_rec->data);
ret = -EINVAL;
break;
case IQS62X_FW_REC_TYPE_HALL:
if (!hall_cal_index) {
ret = regmap_write(iqs62x->regmap,
IQS62X_OTP_CMD,
IQS62X_OTP_CMD_FG3);
if (ret)
break;
ret = regmap_read(iqs62x->regmap,
IQS62X_OTP_DATA, &val);
if (ret)
break;
hall_cal_index = val & IQS62X_HALL_CAL_MASK;
if (!hall_cal_index) {
dev_err(&client->dev,
"Uncalibrated device\n");
ret = -ENODATA;
break;
}
}
if (hall_cal_index > fw_rec->len) {
ret = -EINVAL;
break;
}
mask = 0;
data = &fw_rec->data + hall_cal_index - 1;
len = sizeof(*data);
break;
case IQS62X_FW_REC_TYPE_MASK:
if (fw_rec->len < (sizeof(mask) + sizeof(*data))) {
ret = -EINVAL;
break;
}
mask = fw_rec->data;
data = &fw_rec->data + sizeof(mask);
len = sizeof(*data);
break;
case IQS62X_FW_REC_TYPE_DATA:
mask = 0;
data = &fw_rec->data;
len = fw_rec->len;
break;
default:
dev_err(&client->dev,
"Unrecognized record type: 0x%02X\n",
fw_rec->type);
ret = -EINVAL;
}
if (ret)
break;
fw_blk = devm_kzalloc(&client->dev,
struct_size(fw_blk, data, len),
GFP_KERNEL);
if (!fw_blk) {
ret = -ENOMEM;
break;
}
fw_blk->addr = fw_rec->addr;
fw_blk->mask = mask;
fw_blk->len = len;
memcpy(fw_blk->data, data, len);
list_add(&fw_blk->list, &iqs62x->fw_blk_head);
}
release_firmware(fw);
return ret;
}
const struct iqs62x_event_desc iqs62x_events[IQS62X_NUM_EVENTS] = {
[IQS62X_EVENT_PROX_CH0_T] = {
.reg = IQS62X_EVENT_PROX,
.mask = BIT(4),
.val = BIT(4),
},
[IQS62X_EVENT_PROX_CH0_P] = {
.reg = IQS62X_EVENT_PROX,
.mask = BIT(0),
.val = BIT(0),
},
[IQS62X_EVENT_PROX_CH1_T] = {
.reg = IQS62X_EVENT_PROX,
.mask = BIT(5),
.val = BIT(5),
},
[IQS62X_EVENT_PROX_CH1_P] = {
.reg = IQS62X_EVENT_PROX,
.mask = BIT(1),
.val = BIT(1),
},
[IQS62X_EVENT_PROX_CH2_T] = {
.reg = IQS62X_EVENT_PROX,
.mask = BIT(6),
.val = BIT(6),
},
[IQS62X_EVENT_PROX_CH2_P] = {
.reg = IQS62X_EVENT_PROX,
.mask = BIT(2),
.val = BIT(2),
},
[IQS62X_EVENT_HYST_POS_T] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(6) | BIT(7),
.val = BIT(6),
},
[IQS62X_EVENT_HYST_POS_P] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(5) | BIT(7),
.val = BIT(5),
},
[IQS62X_EVENT_HYST_NEG_T] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(6) | BIT(7),
.val = BIT(6) | BIT(7),
},
[IQS62X_EVENT_HYST_NEG_P] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(5) | BIT(7),
.val = BIT(5) | BIT(7),
},
[IQS62X_EVENT_SAR1_ACT] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(4),
.val = BIT(4),
},
[IQS62X_EVENT_SAR1_QRD] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(2),
.val = BIT(2),
},
[IQS62X_EVENT_SAR1_MOVE] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(1),
.val = BIT(1),
},
[IQS62X_EVENT_SAR1_HALT] = {
.reg = IQS62X_EVENT_HYST,
.mask = BIT(0),
.val = BIT(0),
},
[IQS62X_EVENT_WHEEL_UP] = {
.reg = IQS62X_EVENT_WHEEL,
.mask = BIT(7) | BIT(6),
.val = BIT(7),
},
[IQS62X_EVENT_WHEEL_DN] = {
.reg = IQS62X_EVENT_WHEEL,
.mask = BIT(7) | BIT(6),
.val = BIT(7) | BIT(6),
},
[IQS62X_EVENT_HALL_N_T] = {
.reg = IQS62X_EVENT_HALL,
.mask = BIT(2) | BIT(0),
.val = BIT(2),
},
[IQS62X_EVENT_HALL_N_P] = {
.reg = IQS62X_EVENT_HALL,
.mask = BIT(1) | BIT(0),
.val = BIT(1),
},
[IQS62X_EVENT_HALL_S_T] = {
.reg = IQS62X_EVENT_HALL,
.mask = BIT(2) | BIT(0),
.val = BIT(2) | BIT(0),
},
[IQS62X_EVENT_HALL_S_P] = {
.reg = IQS62X_EVENT_HALL,
.mask = BIT(1) | BIT(0),
.val = BIT(1) | BIT(0),
},
[IQS62X_EVENT_SYS_RESET] = {
.reg = IQS62X_EVENT_SYS,
.mask = BIT(7),
.val = BIT(7),
},
};
EXPORT_SYMBOL_GPL(iqs62x_events);
static irqreturn_t iqs62x_irq(int irq, void *context)
{
struct iqs62x_core *iqs62x = context;
struct i2c_client *client = iqs62x->client;
struct iqs62x_event_data event_data;
struct iqs62x_event_desc event_desc;
enum iqs62x_event_reg event_reg;
unsigned long event_flags = 0;
int ret, i, j;
u8 event_map[IQS62X_EVENT_SIZE];
/*
* The device asserts the RDY output to signal the beginning of a
* communication window, which is closed by an I2C stop condition.
* As such, all interrupt status is captured in a single read and
* broadcast to any interested sub-device drivers.
*/
ret = regmap_raw_read(iqs62x->regmap, IQS62X_SYS_FLAGS, event_map,
sizeof(event_map));
if (ret) {
dev_err(&client->dev, "Failed to read device status: %d\n",
ret);
return IRQ_NONE;
}
for (i = 0; i < sizeof(event_map); i++) {
event_reg = iqs62x->dev_desc->event_regs[iqs62x->ui_sel][i];
switch (event_reg) {
case IQS62X_EVENT_UI_LO:
event_data.ui_data = get_unaligned_le16(&event_map[i]);
fallthrough;
case IQS62X_EVENT_UI_HI:
case IQS62X_EVENT_NONE:
continue;
case IQS62X_EVENT_ALS:
event_data.als_flags = event_map[i];
continue;
case IQS62X_EVENT_IR:
event_data.ir_flags = event_map[i];
continue;
case IQS62X_EVENT_INTER:
event_data.interval = event_map[i];
continue;
case IQS62X_EVENT_HYST:
event_map[i] <<= iqs62x->dev_desc->hyst_shift;
fallthrough;
case IQS62X_EVENT_WHEEL:
case IQS62X_EVENT_HALL:
case IQS62X_EVENT_PROX:
case IQS62X_EVENT_SYS:
break;
}
for (j = 0; j < IQS62X_NUM_EVENTS; j++) {
event_desc = iqs62x_events[j];
if (event_desc.reg != event_reg)
continue;
if ((event_map[i] & event_desc.mask) == event_desc.val)
event_flags |= BIT(j);
}
}
/*
* The device resets itself in response to the I2C master stalling
* communication past a fixed timeout. In this case, all registers
* are restored and any interested sub-device drivers are notified.
*/
if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
dev_err(&client->dev, "Unexpected device reset\n");
ret = iqs62x_dev_init(iqs62x);
if (ret) {
dev_err(&client->dev,
"Failed to re-initialize device: %d\n", ret);
return IRQ_NONE;
}
}
ret = blocking_notifier_call_chain(&iqs62x->nh, event_flags,
&event_data);
if (ret & NOTIFY_STOP_MASK)
return IRQ_NONE;
/*
* Once the communication window is closed, a small delay is added to
* ensure the device's RDY output has been deasserted by the time the
* interrupt handler returns.
*/
usleep_range(50, 100);
return IRQ_HANDLED;
}
static void iqs62x_firmware_load(const struct firmware *fw, void *context)
{
struct iqs62x_core *iqs62x = context;
struct i2c_client *client = iqs62x->client;
int ret;
if (fw) {
ret = iqs62x_firmware_parse(iqs62x, fw);
if (ret) {
dev_err(&client->dev, "Failed to parse firmware: %d\n",
ret);
goto err_out;
}
}
ret = iqs62x_dev_init(iqs62x);
if (ret) {
dev_err(&client->dev, "Failed to initialize device: %d\n", ret);
goto err_out;
}
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, iqs62x_irq, IRQF_ONESHOT,
client->name, iqs62x);
if (ret) {
dev_err(&client->dev, "Failed to request IRQ: %d\n", ret);
goto err_out;
}
ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
iqs62x->dev_desc->sub_devs,
iqs62x->dev_desc->num_sub_devs,
NULL, 0, NULL);
if (ret)
dev_err(&client->dev, "Failed to add sub-devices: %d\n", ret);
err_out:
complete_all(&iqs62x->fw_done);
}
static const struct mfd_cell iqs620at_sub_devs[] = {
{
.name = "iqs62x-keys",
.of_compatible = "azoteq,iqs620a-keys",
},
{
.name = "iqs620a-pwm",
.of_compatible = "azoteq,iqs620a-pwm",
},
{ .name = "iqs620at-temp", },
};
static const struct mfd_cell iqs620a_sub_devs[] = {
{
.name = "iqs62x-keys",
.of_compatible = "azoteq,iqs620a-keys",
},
{
.name = "iqs620a-pwm",
.of_compatible = "azoteq,iqs620a-pwm",
},
};
static const struct mfd_cell iqs621_sub_devs[] = {
{
.name = "iqs62x-keys",
.of_compatible = "azoteq,iqs621-keys",
},
{ .name = "iqs621-als", },
};
static const struct mfd_cell iqs622_sub_devs[] = {
{
.name = "iqs62x-keys",
.of_compatible = "azoteq,iqs622-keys",
},
{ .name = "iqs621-als", },
};
static const struct mfd_cell iqs624_sub_devs[] = {
{
.name = "iqs62x-keys",
.of_compatible = "azoteq,iqs624-keys",
},
{ .name = "iqs624-pos", },
};
static const struct mfd_cell iqs625_sub_devs[] = {
{
.name = "iqs62x-keys",
.of_compatible = "azoteq,iqs625-keys",
},
{ .name = "iqs624-pos", },
};
static const u8 iqs620at_cal_regs[] = {
IQS620_TEMP_CAL_MULT,
IQS620_TEMP_CAL_DIV,
IQS620_TEMP_CAL_OFFS,
};
static const u8 iqs621_cal_regs[] = {
IQS621_ALS_CAL_DIV_LUX,
IQS621_ALS_CAL_DIV_IR,
};
static const enum iqs62x_event_reg iqs620a_event_regs[][IQS62X_EVENT_SIZE] = {
[IQS62X_UI_PROX] = {
IQS62X_EVENT_SYS, /* 0x10 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_PROX, /* 0x12 */
IQS62X_EVENT_HYST, /* 0x13 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_HALL, /* 0x16 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
},
[IQS62X_UI_SAR1] = {
IQS62X_EVENT_SYS, /* 0x10 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_HYST, /* 0x13 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_HALL, /* 0x16 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
},
};
static const enum iqs62x_event_reg iqs621_event_regs[][IQS62X_EVENT_SIZE] = {
[IQS62X_UI_PROX] = {
IQS62X_EVENT_SYS, /* 0x10 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_PROX, /* 0x12 */
IQS62X_EVENT_HYST, /* 0x13 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_ALS, /* 0x16 */
IQS62X_EVENT_UI_LO, /* 0x17 */
IQS62X_EVENT_UI_HI, /* 0x18 */
IQS62X_EVENT_HALL, /* 0x19 */
},
};
static const enum iqs62x_event_reg iqs622_event_regs[][IQS62X_EVENT_SIZE] = {
[IQS62X_UI_PROX] = {
IQS62X_EVENT_SYS, /* 0x10 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_PROX, /* 0x12 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_ALS, /* 0x14 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_IR, /* 0x16 */
IQS62X_EVENT_UI_LO, /* 0x17 */
IQS62X_EVENT_UI_HI, /* 0x18 */
IQS62X_EVENT_HALL, /* 0x19 */
},
[IQS62X_UI_SAR1] = {
IQS62X_EVENT_SYS, /* 0x10 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_HYST, /* 0x13 */
IQS62X_EVENT_ALS, /* 0x14 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_IR, /* 0x16 */
IQS62X_EVENT_UI_LO, /* 0x17 */
IQS62X_EVENT_UI_HI, /* 0x18 */
IQS62X_EVENT_HALL, /* 0x19 */
},
};
static const enum iqs62x_event_reg iqs624_event_regs[][IQS62X_EVENT_SIZE] = {
[IQS62X_UI_PROX] = {
IQS62X_EVENT_SYS, /* 0x10 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_PROX, /* 0x12 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_WHEEL, /* 0x14 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_UI_LO, /* 0x16 */
IQS62X_EVENT_UI_HI, /* 0x17 */
IQS62X_EVENT_INTER, /* 0x18 */
IQS62X_EVENT_NONE,
},
};
static const enum iqs62x_event_reg iqs625_event_regs[][IQS62X_EVENT_SIZE] = {
[IQS62X_UI_PROX] = {
IQS62X_EVENT_SYS, /* 0x10 */
IQS62X_EVENT_PROX, /* 0x11 */
IQS62X_EVENT_INTER, /* 0x12 */
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
IQS62X_EVENT_NONE,
},
};
static const struct iqs62x_dev_desc iqs62x_devs[] = {
{
.dev_name = "iqs620at",
.sub_devs = iqs620at_sub_devs,
.num_sub_devs = ARRAY_SIZE(iqs620at_sub_devs),
.prod_num = IQS620_PROD_NUM,
.sw_num = 0x08,
.cal_regs = iqs620at_cal_regs,
.num_cal_regs = ARRAY_SIZE(iqs620at_cal_regs),
.prox_mask = BIT(0),
.sar_mask = BIT(1) | BIT(7),
.hall_mask = BIT(2),
.hyst_mask = BIT(3),
.temp_mask = BIT(4),
.prox_settings = IQS620_PROX_SETTINGS_4,
.hall_flags = IQS620_HALL_FLAGS,
.clk_div = 4,
.fw_name = "iqs620a.bin",
.event_regs = &iqs620a_event_regs[IQS62X_UI_PROX],
},
{
.dev_name = "iqs620a",
.sub_devs = iqs620a_sub_devs,
.num_sub_devs = ARRAY_SIZE(iqs620a_sub_devs),
.prod_num = IQS620_PROD_NUM,
.sw_num = 0x08,
.prox_mask = BIT(0),
.sar_mask = BIT(1) | BIT(7),
.hall_mask = BIT(2),
.hyst_mask = BIT(3),
.temp_mask = BIT(4),
.prox_settings = IQS620_PROX_SETTINGS_4,
.hall_flags = IQS620_HALL_FLAGS,
.clk_div = 4,
.fw_name = "iqs620a.bin",
.event_regs = &iqs620a_event_regs[IQS62X_UI_PROX],
},
{
.dev_name = "iqs621",
.sub_devs = iqs621_sub_devs,
.num_sub_devs = ARRAY_SIZE(iqs621_sub_devs),
.prod_num = IQS621_PROD_NUM,
.sw_num = 0x09,
.cal_regs = iqs621_cal_regs,
.num_cal_regs = ARRAY_SIZE(iqs621_cal_regs),
.prox_mask = BIT(0),
.hall_mask = BIT(1),
.als_mask = BIT(2),
.hyst_mask = BIT(3),
.temp_mask = BIT(4),
.als_flags = IQS621_ALS_FLAGS,
.hall_flags = IQS621_HALL_FLAGS,
.hyst_shift = 5,
.clk_div = 2,
.fw_name = "iqs621.bin",
.event_regs = &iqs621_event_regs[IQS62X_UI_PROX],
},
{
.dev_name = "iqs622",
.sub_devs = iqs622_sub_devs,
.num_sub_devs = ARRAY_SIZE(iqs622_sub_devs),
.prod_num = IQS622_PROD_NUM,
.sw_num = 0x06,
.prox_mask = BIT(0),
.sar_mask = BIT(1),
.hall_mask = BIT(2),
.als_mask = BIT(3),
.ir_mask = BIT(4),
.prox_settings = IQS622_PROX_SETTINGS_4,
.als_flags = IQS622_ALS_FLAGS,
.hall_flags = IQS622_HALL_FLAGS,
.clk_div = 2,
.fw_name = "iqs622.bin",
.event_regs = &iqs622_event_regs[IQS62X_UI_PROX],
},
{
.dev_name = "iqs624",
.sub_devs = iqs624_sub_devs,
.num_sub_devs = ARRAY_SIZE(iqs624_sub_devs),
.prod_num = IQS624_PROD_NUM,
.sw_num = 0x0B,
.interval = IQS624_INTERVAL_NUM,
.interval_div = 3,
.clk_div = 2,
.fw_name = "iqs624.bin",
.event_regs = &iqs624_event_regs[IQS62X_UI_PROX],
},
{
.dev_name = "iqs625",
.sub_devs = iqs625_sub_devs,
.num_sub_devs = ARRAY_SIZE(iqs625_sub_devs),
.prod_num = IQS625_PROD_NUM,
.sw_num = 0x0B,
.interval = IQS625_INTERVAL_NUM,
.interval_div = 10,
.clk_div = 2,
.fw_name = "iqs625.bin",
.event_regs = &iqs625_event_regs[IQS62X_UI_PROX],
},
};
static const struct regmap_config iqs62x_map_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = IQS62X_MAX_REG,
};
static int iqs62x_probe(struct i2c_client *client)
{
struct iqs62x_core *iqs62x;
struct iqs62x_info info;
unsigned int val;
int ret, i, j;
u8 sw_num = 0;
const char *fw_name = NULL;
iqs62x = devm_kzalloc(&client->dev, sizeof(*iqs62x), GFP_KERNEL);
if (!iqs62x)
return -ENOMEM;
i2c_set_clientdata(client, iqs62x);
iqs62x->client = client;
BLOCKING_INIT_NOTIFIER_HEAD(&iqs62x->nh);
INIT_LIST_HEAD(&iqs62x->fw_blk_head);
init_completion(&iqs62x->fw_done);
iqs62x->regmap = devm_regmap_init_i2c(client, &iqs62x_map_config);
if (IS_ERR(iqs62x->regmap)) {
ret = PTR_ERR(iqs62x->regmap);
dev_err(&client->dev, "Failed to initialize register map: %d\n",
ret);
return ret;
}
ret = regmap_raw_read(iqs62x->regmap, IQS62X_PROD_NUM, &info,
sizeof(info));
if (ret)
return ret;
/*
* The following sequence validates the device's product and software
* numbers. It then determines if the device is factory-calibrated by
* checking for nonzero values in the device's designated calibration
* registers (if applicable). Depending on the device, the absence of
* calibration data indicates a reduced feature set or invalid device.
*
* For devices given in both calibrated and uncalibrated versions, the
* calibrated version (e.g. IQS620AT) appears first in the iqs62x_devs
* array. The uncalibrated version (e.g. IQS620A) appears next and has
* the same product and software numbers, but no calibration registers
* are specified.
*/
for (i = 0; i < ARRAY_SIZE(iqs62x_devs); i++) {
if (info.prod_num != iqs62x_devs[i].prod_num)
continue;
iqs62x->dev_desc = &iqs62x_devs[i];
if (info.sw_num < iqs62x->dev_desc->sw_num)
continue;
sw_num = info.sw_num;
/*
* Read each of the device's designated calibration registers,
* if any, and exit from the inner loop early if any are equal
* to zero (indicating the device is uncalibrated). This could
* be acceptable depending on the device (e.g. IQS620A instead
* of IQS620AT).
*/
for (j = 0; j < iqs62x->dev_desc->num_cal_regs; j++) {
ret = regmap_read(iqs62x->regmap,
iqs62x->dev_desc->cal_regs[j], &val);
if (ret)
return ret;
if (!val)
break;
}
/*
* If the number of nonzero values read from the device equals
* the number of designated calibration registers (which could
* be zero), exit from the outer loop early to signal that the
* device's product and software numbers match a known device,
* and the device is calibrated (if applicable).
*/
if (j == iqs62x->dev_desc->num_cal_regs)
break;
}
if (!iqs62x->dev_desc) {
dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
info.prod_num);
return -EINVAL;
}
if (!sw_num) {
dev_err(&client->dev, "Unrecognized software number: 0x%02X\n",
info.sw_num);
return -EINVAL;
}
if (i == ARRAY_SIZE(iqs62x_devs)) {
dev_err(&client->dev, "Uncalibrated device\n");
return -ENODATA;
}
device_property_read_string(&client->dev, "firmware-name", &fw_name);
ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
fw_name ? : iqs62x->dev_desc->fw_name,
&client->dev, GFP_KERNEL, iqs62x,
iqs62x_firmware_load);
if (ret)
dev_err(&client->dev, "Failed to request firmware: %d\n", ret);
return ret;
}
static int iqs62x_remove(struct i2c_client *client)
{
struct iqs62x_core *iqs62x = i2c_get_clientdata(client);
wait_for_completion(&iqs62x->fw_done);
return 0;
}
static int __maybe_unused iqs62x_suspend(struct device *dev)
{
struct iqs62x_core *iqs62x = dev_get_drvdata(dev);
int ret;
wait_for_completion(&iqs62x->fw_done);
/*
* As per the datasheet, automatic mode switching must be disabled
* before the device is placed in or taken out of halt mode.
*/
ret = regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS,
IQS62X_PWR_SETTINGS_DIS_AUTO, 0xFF);
if (ret)
return ret;
return regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS,
IQS62X_PWR_SETTINGS_PWR_MODE_MASK,
IQS62X_PWR_SETTINGS_PWR_MODE_HALT);
}
static int __maybe_unused iqs62x_resume(struct device *dev)
{
struct iqs62x_core *iqs62x = dev_get_drvdata(dev);
int ret;
ret = regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS,
IQS62X_PWR_SETTINGS_PWR_MODE_MASK,
IQS62X_PWR_SETTINGS_PWR_MODE_NORM);
if (ret)
return ret;
return regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS,
IQS62X_PWR_SETTINGS_DIS_AUTO, 0);
}
static SIMPLE_DEV_PM_OPS(iqs62x_pm, iqs62x_suspend, iqs62x_resume);
static const struct of_device_id iqs62x_of_match[] = {
{ .compatible = "azoteq,iqs620a" },
{ .compatible = "azoteq,iqs621" },
{ .compatible = "azoteq,iqs622" },
{ .compatible = "azoteq,iqs624" },
{ .compatible = "azoteq,iqs625" },
{ }
};
MODULE_DEVICE_TABLE(of, iqs62x_of_match);
static struct i2c_driver iqs62x_i2c_driver = {
.driver = {
.name = "iqs62x",
.of_match_table = iqs62x_of_match,
.pm = &iqs62x_pm,
},
.probe_new = iqs62x_probe,
.remove = iqs62x_remove,
};
module_i2c_driver(iqs62x_i2c_driver);
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
MODULE_DESCRIPTION("Azoteq IQS620A/621/622/624/625 Multi-Function Sensors");
MODULE_LICENSE("GPL");
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