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path: root/drivers/input/touchscreen/iqs5xx.c
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Diffstat (limited to 'drivers/input/touchscreen/iqs5xx.c')
-rw-r--r--drivers/input/touchscreen/iqs5xx.c1102
1 files changed, 1102 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/iqs5xx.c b/drivers/input/touchscreen/iqs5xx.c
new file mode 100644
index 0000000000..b4768b66eb
--- /dev/null
+++ b/drivers/input/touchscreen/iqs5xx.c
@@ -0,0 +1,1102 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
+ *
+ * Copyright (C) 2018 Jeff LaBundy <jeff@labundy.com>
+ *
+ * These devices require firmware exported from a PC-based configuration tool
+ * made available by the vendor. Firmware files may be pushed to the device's
+ * nonvolatile memory by writing the filename to the 'fw_file' sysfs control.
+ *
+ * Link to PC-based configuration tool and datasheet: https://www.azoteq.com/
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+
+#define IQS5XX_FW_FILE_LEN 64
+#define IQS5XX_NUM_RETRIES 10
+#define IQS5XX_NUM_CONTACTS 5
+#define IQS5XX_WR_BYTES_MAX 2
+
+#define IQS5XX_PROD_NUM_IQS550 40
+#define IQS5XX_PROD_NUM_IQS572 58
+#define IQS5XX_PROD_NUM_IQS525 52
+
+#define IQS5XX_SHOW_RESET BIT(7)
+#define IQS5XX_ACK_RESET BIT(7)
+
+#define IQS5XX_SUSPEND BIT(0)
+#define IQS5XX_RESUME 0
+
+#define IQS5XX_SETUP_COMPLETE BIT(6)
+#define IQS5XX_WDT BIT(5)
+#define IQS5XX_ALP_REATI BIT(3)
+#define IQS5XX_REATI BIT(2)
+
+#define IQS5XX_TP_EVENT BIT(2)
+#define IQS5XX_EVENT_MODE BIT(0)
+
+#define IQS5XX_PROD_NUM 0x0000
+#define IQS5XX_SYS_INFO0 0x000F
+#define IQS5XX_SYS_INFO1 0x0010
+#define IQS5XX_SYS_CTRL0 0x0431
+#define IQS5XX_SYS_CTRL1 0x0432
+#define IQS5XX_SYS_CFG0 0x058E
+#define IQS5XX_SYS_CFG1 0x058F
+#define IQS5XX_X_RES 0x066E
+#define IQS5XX_Y_RES 0x0670
+#define IQS5XX_EXP_FILE 0x0677
+#define IQS5XX_CHKSM 0x83C0
+#define IQS5XX_APP 0x8400
+#define IQS5XX_CSTM 0xBE00
+#define IQS5XX_PMAP_END 0xBFFF
+#define IQS5XX_END_COMM 0xEEEE
+
+#define IQS5XX_CHKSM_LEN (IQS5XX_APP - IQS5XX_CHKSM)
+#define IQS5XX_APP_LEN (IQS5XX_CSTM - IQS5XX_APP)
+#define IQS5XX_CSTM_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CSTM)
+#define IQS5XX_PMAP_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CHKSM)
+
+#define IQS5XX_REC_HDR_LEN 4
+#define IQS5XX_REC_LEN_MAX 255
+#define IQS5XX_REC_TYPE_DATA 0x00
+#define IQS5XX_REC_TYPE_EOF 0x01
+
+#define IQS5XX_BL_ADDR_MASK 0x40
+#define IQS5XX_BL_CMD_VER 0x00
+#define IQS5XX_BL_CMD_READ 0x01
+#define IQS5XX_BL_CMD_EXEC 0x02
+#define IQS5XX_BL_CMD_CRC 0x03
+#define IQS5XX_BL_BLK_LEN_MAX 64
+#define IQS5XX_BL_ID 0x0200
+#define IQS5XX_BL_STATUS_NONE 0xEE
+#define IQS5XX_BL_CRC_PASS 0x00
+#define IQS5XX_BL_CRC_FAIL 0x01
+#define IQS5XX_BL_ATTEMPTS 3
+
+struct iqs5xx_dev_id_info {
+ __be16 prod_num;
+ __be16 proj_num;
+ u8 major_ver;
+ u8 minor_ver;
+ u8 bl_status;
+} __packed;
+
+struct iqs5xx_ihex_rec {
+ char start;
+ char len[2];
+ char addr[4];
+ char type[2];
+ char data[2];
+} __packed;
+
+struct iqs5xx_touch_data {
+ __be16 abs_x;
+ __be16 abs_y;
+ __be16 strength;
+ u8 area;
+} __packed;
+
+struct iqs5xx_status {
+ u8 sys_info[2];
+ u8 num_active;
+ __be16 rel_x;
+ __be16 rel_y;
+ struct iqs5xx_touch_data touch_data[IQS5XX_NUM_CONTACTS];
+} __packed;
+
+struct iqs5xx_private {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct gpio_desc *reset_gpio;
+ struct touchscreen_properties prop;
+ struct mutex lock;
+ struct iqs5xx_dev_id_info dev_id_info;
+ u8 exp_file[2];
+};
+
+static int iqs5xx_read_burst(struct i2c_client *client,
+ u16 reg, void *val, u16 len)
+{
+ __be16 reg_buf = cpu_to_be16(reg);
+ int ret, i;
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = sizeof(reg_buf),
+ .buf = (u8 *)&reg_buf,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = len,
+ .buf = (u8 *)val,
+ },
+ };
+
+ /*
+ * The first addressing attempt outside of a communication window fails
+ * and must be retried, after which the device clock stretches until it
+ * is available.
+ */
+ for (i = 0; i < IQS5XX_NUM_RETRIES; i++) {
+ ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
+ if (ret == ARRAY_SIZE(msg))
+ return 0;
+
+ usleep_range(200, 300);
+ }
+
+ if (ret >= 0)
+ ret = -EIO;
+
+ dev_err(&client->dev, "Failed to read from address 0x%04X: %d\n",
+ reg, ret);
+
+ return ret;
+}
+
+static int iqs5xx_read_word(struct i2c_client *client, u16 reg, u16 *val)
+{
+ __be16 val_buf;
+ int error;
+
+ error = iqs5xx_read_burst(client, reg, &val_buf, sizeof(val_buf));
+ if (error)
+ return error;
+
+ *val = be16_to_cpu(val_buf);
+
+ return 0;
+}
+
+static int iqs5xx_write_burst(struct i2c_client *client,
+ u16 reg, const void *val, u16 len)
+{
+ int ret, i;
+ u16 mlen = sizeof(reg) + len;
+ u8 mbuf[sizeof(reg) + IQS5XX_WR_BYTES_MAX];
+
+ if (len > IQS5XX_WR_BYTES_MAX)
+ return -EINVAL;
+
+ put_unaligned_be16(reg, mbuf);
+ memcpy(mbuf + sizeof(reg), val, len);
+
+ /*
+ * The first addressing attempt outside of a communication window fails
+ * and must be retried, after which the device clock stretches until it
+ * is available.
+ */
+ for (i = 0; i < IQS5XX_NUM_RETRIES; i++) {
+ ret = i2c_master_send(client, mbuf, mlen);
+ if (ret == mlen)
+ return 0;
+
+ usleep_range(200, 300);
+ }
+
+ if (ret >= 0)
+ ret = -EIO;
+
+ dev_err(&client->dev, "Failed to write to address 0x%04X: %d\n",
+ reg, ret);
+
+ return ret;
+}
+
+static int iqs5xx_write_word(struct i2c_client *client, u16 reg, u16 val)
+{
+ __be16 val_buf = cpu_to_be16(val);
+
+ return iqs5xx_write_burst(client, reg, &val_buf, sizeof(val_buf));
+}
+
+static int iqs5xx_write_byte(struct i2c_client *client, u16 reg, u8 val)
+{
+ return iqs5xx_write_burst(client, reg, &val, sizeof(val));
+}
+
+static void iqs5xx_reset(struct i2c_client *client)
+{
+ struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
+
+ gpiod_set_value_cansleep(iqs5xx->reset_gpio, 1);
+ usleep_range(200, 300);
+
+ gpiod_set_value_cansleep(iqs5xx->reset_gpio, 0);
+}
+
+static int iqs5xx_bl_cmd(struct i2c_client *client, u8 bl_cmd, u16 bl_addr)
+{
+ struct i2c_msg msg;
+ int ret;
+ u8 mbuf[sizeof(bl_cmd) + sizeof(bl_addr)];
+
+ msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
+ msg.flags = 0;
+ msg.len = sizeof(bl_cmd);
+ msg.buf = mbuf;
+
+ *mbuf = bl_cmd;
+
+ switch (bl_cmd) {
+ case IQS5XX_BL_CMD_VER:
+ case IQS5XX_BL_CMD_CRC:
+ case IQS5XX_BL_CMD_EXEC:
+ break;
+ case IQS5XX_BL_CMD_READ:
+ msg.len += sizeof(bl_addr);
+ put_unaligned_be16(bl_addr, mbuf + sizeof(bl_cmd));
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ if (ret != 1)
+ goto msg_fail;
+
+ switch (bl_cmd) {
+ case IQS5XX_BL_CMD_VER:
+ msg.len = sizeof(u16);
+ break;
+ case IQS5XX_BL_CMD_CRC:
+ msg.len = sizeof(u8);
+ /*
+ * This delay saves the bus controller the trouble of having to
+ * tolerate a relatively long clock-stretching period while the
+ * CRC is calculated.
+ */
+ msleep(50);
+ break;
+ case IQS5XX_BL_CMD_EXEC:
+ usleep_range(10000, 10100);
+ fallthrough;
+ default:
+ return 0;
+ }
+
+ msg.flags = I2C_M_RD;
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ if (ret != 1)
+ goto msg_fail;
+
+ if (bl_cmd == IQS5XX_BL_CMD_VER &&
+ get_unaligned_be16(mbuf) != IQS5XX_BL_ID) {
+ dev_err(&client->dev, "Unrecognized bootloader ID: 0x%04X\n",
+ get_unaligned_be16(mbuf));
+ return -EINVAL;
+ }
+
+ if (bl_cmd == IQS5XX_BL_CMD_CRC && *mbuf != IQS5XX_BL_CRC_PASS) {
+ dev_err(&client->dev, "Bootloader CRC failed\n");
+ return -EIO;
+ }
+
+ return 0;
+
+msg_fail:
+ if (ret >= 0)
+ ret = -EIO;
+
+ if (bl_cmd != IQS5XX_BL_CMD_VER)
+ dev_err(&client->dev,
+ "Unsuccessful bootloader command 0x%02X: %d\n",
+ bl_cmd, ret);
+
+ return ret;
+}
+
+static int iqs5xx_bl_open(struct i2c_client *client)
+{
+ int error, i, j;
+
+ /*
+ * The device opens a bootloader polling window for 2 ms following the
+ * release of reset. If the host cannot establish communication during
+ * this time frame, it must cycle reset again.
+ */
+ for (i = 0; i < IQS5XX_BL_ATTEMPTS; i++) {
+ iqs5xx_reset(client);
+ usleep_range(350, 400);
+
+ for (j = 0; j < IQS5XX_NUM_RETRIES; j++) {
+ error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0);
+ if (!error)
+ usleep_range(10000, 10100);
+ else if (error != -EINVAL)
+ continue;
+
+ return error;
+ }
+ }
+
+ dev_err(&client->dev, "Failed to open bootloader: %d\n", error);
+
+ return error;
+}
+
+static int iqs5xx_bl_write(struct i2c_client *client,
+ u16 bl_addr, u8 *pmap_data, u16 pmap_len)
+{
+ struct i2c_msg msg;
+ int ret, i;
+ u8 mbuf[sizeof(bl_addr) + IQS5XX_BL_BLK_LEN_MAX];
+
+ if (pmap_len % IQS5XX_BL_BLK_LEN_MAX)
+ return -EINVAL;
+
+ msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
+ msg.flags = 0;
+ msg.len = sizeof(mbuf);
+ msg.buf = mbuf;
+
+ for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) {
+ put_unaligned_be16(bl_addr + i, mbuf);
+ memcpy(mbuf + sizeof(bl_addr), pmap_data + i,
+ sizeof(mbuf) - sizeof(bl_addr));
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ if (ret != 1)
+ goto msg_fail;
+
+ usleep_range(10000, 10100);
+ }
+
+ return 0;
+
+msg_fail:
+ if (ret >= 0)
+ ret = -EIO;
+
+ dev_err(&client->dev, "Failed to write block at address 0x%04X: %d\n",
+ bl_addr + i, ret);
+
+ return ret;
+}
+
+static int iqs5xx_bl_verify(struct i2c_client *client,
+ u16 bl_addr, u8 *pmap_data, u16 pmap_len)
+{
+ struct i2c_msg msg;
+ int ret, i;
+ u8 bl_data[IQS5XX_BL_BLK_LEN_MAX];
+
+ if (pmap_len % IQS5XX_BL_BLK_LEN_MAX)
+ return -EINVAL;
+
+ msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
+ msg.flags = I2C_M_RD;
+ msg.len = sizeof(bl_data);
+ msg.buf = bl_data;
+
+ for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) {
+ ret = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_READ, bl_addr + i);
+ if (ret)
+ return ret;
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ if (ret != 1)
+ goto msg_fail;
+
+ if (memcmp(bl_data, pmap_data + i, sizeof(bl_data))) {
+ dev_err(&client->dev,
+ "Failed to verify block at address 0x%04X\n",
+ bl_addr + i);
+ return -EIO;
+ }
+ }
+
+ return 0;
+
+msg_fail:
+ if (ret >= 0)
+ ret = -EIO;
+
+ dev_err(&client->dev, "Failed to read block at address 0x%04X: %d\n",
+ bl_addr + i, ret);
+
+ return ret;
+}
+
+static int iqs5xx_set_state(struct i2c_client *client, u8 state)
+{
+ struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
+ int error1, error2;
+
+ if (!iqs5xx->dev_id_info.bl_status)
+ return 0;
+
+ mutex_lock(&iqs5xx->lock);
+
+ /*
+ * Addressing the device outside of a communication window prompts it
+ * to assert the RDY output, so disable the interrupt line to prevent
+ * the handler from servicing a false interrupt.
+ */
+ disable_irq(client->irq);
+
+ error1 = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL1, state);
+ error2 = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
+
+ usleep_range(50, 100);
+ enable_irq(client->irq);
+
+ mutex_unlock(&iqs5xx->lock);
+
+ if (error1)
+ return error1;
+
+ return error2;
+}
+
+static int iqs5xx_open(struct input_dev *input)
+{
+ struct iqs5xx_private *iqs5xx = input_get_drvdata(input);
+
+ return iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME);
+}
+
+static void iqs5xx_close(struct input_dev *input)
+{
+ struct iqs5xx_private *iqs5xx = input_get_drvdata(input);
+
+ iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND);
+}
+
+static int iqs5xx_axis_init(struct i2c_client *client)
+{
+ struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
+ struct touchscreen_properties *prop = &iqs5xx->prop;
+ struct input_dev *input = iqs5xx->input;
+ u16 max_x, max_y;
+ int error;
+
+ if (!input) {
+ input = devm_input_allocate_device(&client->dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = client->name;
+ input->id.bustype = BUS_I2C;
+ input->open = iqs5xx_open;
+ input->close = iqs5xx_close;
+
+ input_set_drvdata(input, iqs5xx);
+ iqs5xx->input = input;
+ }
+
+ error = iqs5xx_read_word(client, IQS5XX_X_RES, &max_x);
+ if (error)
+ return error;
+
+ error = iqs5xx_read_word(client, IQS5XX_Y_RES, &max_y);
+ if (error)
+ return error;
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0, U16_MAX, 0, 0);
+
+ touchscreen_parse_properties(input, true, prop);
+
+ /*
+ * The device reserves 0xFFFF for coordinates that correspond to slots
+ * which are not in a state of touch.
+ */
+ if (prop->max_x >= U16_MAX || prop->max_y >= U16_MAX) {
+ dev_err(&client->dev, "Invalid touchscreen size: %u*%u\n",
+ prop->max_x, prop->max_y);
+ return -EINVAL;
+ }
+
+ if (prop->max_x != max_x) {
+ error = iqs5xx_write_word(client, IQS5XX_X_RES, prop->max_x);
+ if (error)
+ return error;
+ }
+
+ if (prop->max_y != max_y) {
+ error = iqs5xx_write_word(client, IQS5XX_Y_RES, prop->max_y);
+ if (error)
+ return error;
+ }
+
+ error = input_mt_init_slots(input, IQS5XX_NUM_CONTACTS,
+ INPUT_MT_DIRECT);
+ if (error)
+ dev_err(&client->dev, "Failed to initialize slots: %d\n",
+ error);
+
+ return error;
+}
+
+static int iqs5xx_dev_init(struct i2c_client *client)
+{
+ struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
+ struct iqs5xx_dev_id_info *dev_id_info;
+ int error;
+ u8 buf[sizeof(*dev_id_info) + 1];
+
+ error = iqs5xx_read_burst(client, IQS5XX_PROD_NUM,
+ &buf[1], sizeof(*dev_id_info));
+ if (error)
+ return iqs5xx_bl_open(client);
+
+ /*
+ * A000 and B000 devices use 8-bit and 16-bit addressing, respectively.
+ * Querying an A000 device's version information with 16-bit addressing
+ * gives the appearance that the data is shifted by one byte; a nonzero
+ * leading array element suggests this could be the case (in which case
+ * the missing zero is prepended).
+ */
+ buf[0] = 0;
+ dev_id_info = (struct iqs5xx_dev_id_info *)&buf[buf[1] ? 0 : 1];
+
+ switch (be16_to_cpu(dev_id_info->prod_num)) {
+ case IQS5XX_PROD_NUM_IQS550:
+ case IQS5XX_PROD_NUM_IQS572:
+ case IQS5XX_PROD_NUM_IQS525:
+ break;
+ default:
+ dev_err(&client->dev, "Unrecognized product number: %u\n",
+ be16_to_cpu(dev_id_info->prod_num));
+ return -EINVAL;
+ }
+
+ /*
+ * With the product number recognized yet shifted by one byte, open the
+ * bootloader and wait for user space to convert the A000 device into a
+ * B000 device via new firmware.
+ */
+ if (buf[1]) {
+ dev_err(&client->dev, "Opening bootloader for A000 device\n");
+ return iqs5xx_bl_open(client);
+ }
+
+ error = iqs5xx_read_burst(client, IQS5XX_EXP_FILE,
+ iqs5xx->exp_file, sizeof(iqs5xx->exp_file));
+ if (error)
+ return error;
+
+ error = iqs5xx_axis_init(client);
+ if (error)
+ return error;
+
+ error = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL0, IQS5XX_ACK_RESET);
+ if (error)
+ return error;
+
+ error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG0,
+ IQS5XX_SETUP_COMPLETE | IQS5XX_WDT |
+ IQS5XX_ALP_REATI | IQS5XX_REATI);
+ if (error)
+ return error;
+
+ error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG1,
+ IQS5XX_TP_EVENT | IQS5XX_EVENT_MODE);
+ if (error)
+ return error;
+
+ error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
+ if (error)
+ return error;
+
+ iqs5xx->dev_id_info = *dev_id_info;
+
+ /*
+ * The following delay allows ATI to complete before the open and close
+ * callbacks are free to elicit I2C communication. Any attempts to read
+ * from or write to the device during this time may face extended clock
+ * stretching and prompt the I2C controller to report an error.
+ */
+ msleep(250);
+
+ return 0;
+}
+
+static irqreturn_t iqs5xx_irq(int irq, void *data)
+{
+ struct iqs5xx_private *iqs5xx = data;
+ struct iqs5xx_status status;
+ struct i2c_client *client = iqs5xx->client;
+ struct input_dev *input = iqs5xx->input;
+ int error, i;
+
+ /*
+ * This check is purely a precaution, as the device does not assert the
+ * RDY output during bootloader mode. If the device operates outside of
+ * bootloader mode, the input device is guaranteed to be allocated.
+ */
+ if (!iqs5xx->dev_id_info.bl_status)
+ return IRQ_NONE;
+
+ error = iqs5xx_read_burst(client, IQS5XX_SYS_INFO0,
+ &status, sizeof(status));
+ if (error)
+ return IRQ_NONE;
+
+ if (status.sys_info[0] & IQS5XX_SHOW_RESET) {
+ dev_err(&client->dev, "Unexpected device reset\n");
+
+ error = iqs5xx_dev_init(client);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to re-initialize device: %d\n", error);
+ return IRQ_NONE;
+ }
+
+ return IRQ_HANDLED;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(status.touch_data); i++) {
+ struct iqs5xx_touch_data *touch_data = &status.touch_data[i];
+ u16 pressure = be16_to_cpu(touch_data->strength);
+
+ input_mt_slot(input, i);
+ if (input_mt_report_slot_state(input, MT_TOOL_FINGER,
+ pressure != 0)) {
+ touchscreen_report_pos(input, &iqs5xx->prop,
+ be16_to_cpu(touch_data->abs_x),
+ be16_to_cpu(touch_data->abs_y),
+ true);
+ input_report_abs(input, ABS_MT_PRESSURE, pressure);
+ }
+ }
+
+ input_mt_sync_frame(input);
+ input_sync(input);
+
+ error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
+ if (error)
+ 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 int iqs5xx_fw_file_parse(struct i2c_client *client,
+ const char *fw_file, u8 *pmap)
+{
+ const struct firmware *fw;
+ struct iqs5xx_ihex_rec *rec;
+ size_t pos = 0;
+ int error, i;
+ u16 rec_num = 1;
+ u16 rec_addr;
+ u8 rec_len, rec_type, rec_chksm, chksm;
+ u8 rec_hdr[IQS5XX_REC_HDR_LEN];
+ u8 rec_data[IQS5XX_REC_LEN_MAX];
+
+ /*
+ * Firmware exported from the vendor's configuration tool deviates from
+ * standard ihex as follows: (1) the checksum for records corresponding
+ * to user-exported settings is not recalculated, and (2) an address of
+ * 0xFFFF is used for the EOF record.
+ *
+ * Because the ihex2fw tool tolerates neither (1) nor (2), the slightly
+ * nonstandard ihex firmware is parsed directly by the driver.
+ */
+ error = request_firmware(&fw, fw_file, &client->dev);
+ if (error) {
+ dev_err(&client->dev, "Failed to request firmware %s: %d\n",
+ fw_file, error);
+ return error;
+ }
+
+ do {
+ if (pos + sizeof(*rec) > fw->size) {
+ dev_err(&client->dev, "Insufficient firmware size\n");
+ error = -EINVAL;
+ break;
+ }
+ rec = (struct iqs5xx_ihex_rec *)(fw->data + pos);
+ pos += sizeof(*rec);
+
+ if (rec->start != ':') {
+ dev_err(&client->dev, "Invalid start at record %u\n",
+ rec_num);
+ error = -EINVAL;
+ break;
+ }
+
+ error = hex2bin(rec_hdr, rec->len, sizeof(rec_hdr));
+ if (error) {
+ dev_err(&client->dev, "Invalid header at record %u\n",
+ rec_num);
+ break;
+ }
+
+ rec_len = *rec_hdr;
+ rec_addr = get_unaligned_be16(rec_hdr + sizeof(rec_len));
+ rec_type = *(rec_hdr + sizeof(rec_len) + sizeof(rec_addr));
+
+ if (pos + rec_len * 2 > fw->size) {
+ dev_err(&client->dev, "Insufficient firmware size\n");
+ error = -EINVAL;
+ break;
+ }
+ pos += (rec_len * 2);
+
+ error = hex2bin(rec_data, rec->data, rec_len);
+ if (error) {
+ dev_err(&client->dev, "Invalid data at record %u\n",
+ rec_num);
+ break;
+ }
+
+ error = hex2bin(&rec_chksm,
+ rec->data + rec_len * 2, sizeof(rec_chksm));
+ if (error) {
+ dev_err(&client->dev, "Invalid checksum at record %u\n",
+ rec_num);
+ break;
+ }
+
+ chksm = 0;
+ for (i = 0; i < sizeof(rec_hdr); i++)
+ chksm += rec_hdr[i];
+ for (i = 0; i < rec_len; i++)
+ chksm += rec_data[i];
+ chksm = ~chksm + 1;
+
+ if (chksm != rec_chksm && rec_addr < IQS5XX_CSTM) {
+ dev_err(&client->dev,
+ "Incorrect checksum at record %u\n",
+ rec_num);
+ error = -EINVAL;
+ break;
+ }
+
+ switch (rec_type) {
+ case IQS5XX_REC_TYPE_DATA:
+ if (rec_addr < IQS5XX_CHKSM ||
+ rec_addr > IQS5XX_PMAP_END) {
+ dev_err(&client->dev,
+ "Invalid address at record %u\n",
+ rec_num);
+ error = -EINVAL;
+ } else {
+ memcpy(pmap + rec_addr - IQS5XX_CHKSM,
+ rec_data, rec_len);
+ }
+ break;
+ case IQS5XX_REC_TYPE_EOF:
+ break;
+ default:
+ dev_err(&client->dev, "Invalid type at record %u\n",
+ rec_num);
+ error = -EINVAL;
+ }
+
+ if (error)
+ break;
+
+ rec_num++;
+ while (pos < fw->size) {
+ if (*(fw->data + pos) == ':')
+ break;
+ pos++;
+ }
+ } while (rec_type != IQS5XX_REC_TYPE_EOF);
+
+ release_firmware(fw);
+
+ return error;
+}
+
+static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
+{
+ struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
+ int error, error_init = 0;
+ u8 *pmap;
+
+ pmap = kzalloc(IQS5XX_PMAP_LEN, GFP_KERNEL);
+ if (!pmap)
+ return -ENOMEM;
+
+ error = iqs5xx_fw_file_parse(client, fw_file, pmap);
+ if (error)
+ goto err_kfree;
+
+ mutex_lock(&iqs5xx->lock);
+
+ /*
+ * Disable the interrupt line in case the first attempt(s) to enter the
+ * bootloader don't happen quickly enough, in which case the device may
+ * assert the RDY output until the next attempt.
+ */
+ disable_irq(client->irq);
+
+ iqs5xx->dev_id_info.bl_status = 0;
+
+ error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0);
+ if (error) {
+ error = iqs5xx_bl_open(client);
+ if (error)
+ goto err_reset;
+ }
+
+ error = iqs5xx_bl_write(client, IQS5XX_CHKSM, pmap, IQS5XX_PMAP_LEN);
+ if (error)
+ goto err_reset;
+
+ error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_CRC, 0);
+ if (error)
+ goto err_reset;
+
+ error = iqs5xx_bl_verify(client, IQS5XX_CSTM,
+ pmap + IQS5XX_CHKSM_LEN + IQS5XX_APP_LEN,
+ IQS5XX_CSTM_LEN);
+
+err_reset:
+ iqs5xx_reset(client);
+ usleep_range(15000, 15100);
+
+ error_init = iqs5xx_dev_init(client);
+ if (!iqs5xx->dev_id_info.bl_status)
+ error_init = error_init ? : -EINVAL;
+
+ enable_irq(client->irq);
+
+ mutex_unlock(&iqs5xx->lock);
+
+err_kfree:
+ kfree(pmap);
+
+ return error ? : error_init;
+}
+
+static ssize_t fw_file_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
+ struct i2c_client *client = iqs5xx->client;
+ size_t len = count;
+ bool input_reg = !iqs5xx->input;
+ char fw_file[IQS5XX_FW_FILE_LEN + 1];
+ int error;
+
+ if (!len)
+ return -EINVAL;
+
+ if (buf[len - 1] == '\n')
+ len--;
+
+ if (len > IQS5XX_FW_FILE_LEN)
+ return -ENAMETOOLONG;
+
+ memcpy(fw_file, buf, len);
+ fw_file[len] = '\0';
+
+ error = iqs5xx_fw_file_write(client, fw_file);
+ if (error)
+ return error;
+
+ /*
+ * If the input device was not allocated already, it is guaranteed to
+ * be allocated by this point and can finally be registered.
+ */
+ if (input_reg) {
+ error = input_register_device(iqs5xx->input);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to register device: %d\n",
+ error);
+ return error;
+ }
+ }
+
+ return count;
+}
+
+static ssize_t fw_info_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
+
+ if (!iqs5xx->dev_id_info.bl_status)
+ return -ENODATA;
+
+ return scnprintf(buf, PAGE_SIZE, "%u.%u.%u.%u:%u.%u\n",
+ be16_to_cpu(iqs5xx->dev_id_info.prod_num),
+ be16_to_cpu(iqs5xx->dev_id_info.proj_num),
+ iqs5xx->dev_id_info.major_ver,
+ iqs5xx->dev_id_info.minor_ver,
+ iqs5xx->exp_file[0], iqs5xx->exp_file[1]);
+}
+
+static DEVICE_ATTR_WO(fw_file);
+static DEVICE_ATTR_RO(fw_info);
+
+static struct attribute *iqs5xx_attrs[] = {
+ &dev_attr_fw_file.attr,
+ &dev_attr_fw_info.attr,
+ NULL,
+};
+
+static umode_t iqs5xx_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int i)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
+
+ if (attr == &dev_attr_fw_file.attr &&
+ (iqs5xx->dev_id_info.bl_status == IQS5XX_BL_STATUS_NONE ||
+ !iqs5xx->reset_gpio))
+ return 0;
+
+ return attr->mode;
+}
+
+static const struct attribute_group iqs5xx_attr_group = {
+ .is_visible = iqs5xx_attr_is_visible,
+ .attrs = iqs5xx_attrs,
+};
+
+static int iqs5xx_suspend(struct device *dev)
+{
+ struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
+ struct input_dev *input = iqs5xx->input;
+ int error = 0;
+
+ if (!input || device_may_wakeup(dev))
+ return error;
+
+ mutex_lock(&input->mutex);
+
+ if (input_device_enabled(input))
+ error = iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND);
+
+ mutex_unlock(&input->mutex);
+
+ return error;
+}
+
+static int iqs5xx_resume(struct device *dev)
+{
+ struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
+ struct input_dev *input = iqs5xx->input;
+ int error = 0;
+
+ if (!input || device_may_wakeup(dev))
+ return error;
+
+ mutex_lock(&input->mutex);
+
+ if (input_device_enabled(input))
+ error = iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME);
+
+ mutex_unlock(&input->mutex);
+
+ return error;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(iqs5xx_pm, iqs5xx_suspend, iqs5xx_resume);
+
+static int iqs5xx_probe(struct i2c_client *client)
+{
+ struct iqs5xx_private *iqs5xx;
+ int error;
+
+ iqs5xx = devm_kzalloc(&client->dev, sizeof(*iqs5xx), GFP_KERNEL);
+ if (!iqs5xx)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, iqs5xx);
+ iqs5xx->client = client;
+
+ iqs5xx->reset_gpio = devm_gpiod_get_optional(&client->dev,
+ "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(iqs5xx->reset_gpio)) {
+ error = PTR_ERR(iqs5xx->reset_gpio);
+ dev_err(&client->dev, "Failed to request GPIO: %d\n", error);
+ return error;
+ }
+
+ mutex_init(&iqs5xx->lock);
+
+ error = iqs5xx_dev_init(client);
+ if (error)
+ return error;
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, iqs5xx_irq, IRQF_ONESHOT,
+ client->name, iqs5xx);
+ if (error) {
+ dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
+ return error;
+ }
+
+ error = devm_device_add_group(&client->dev, &iqs5xx_attr_group);
+ if (error) {
+ dev_err(&client->dev, "Failed to add attributes: %d\n", error);
+ return error;
+ }
+
+ if (iqs5xx->input) {
+ error = input_register_device(iqs5xx->input);
+ if (error)
+ dev_err(&client->dev,
+ "Failed to register device: %d\n",
+ error);
+ }
+
+ return error;
+}
+
+static const struct i2c_device_id iqs5xx_id[] = {
+ { "iqs550", 0 },
+ { "iqs572", 1 },
+ { "iqs525", 2 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, iqs5xx_id);
+
+static const struct of_device_id iqs5xx_of_match[] = {
+ { .compatible = "azoteq,iqs550" },
+ { .compatible = "azoteq,iqs572" },
+ { .compatible = "azoteq,iqs525" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, iqs5xx_of_match);
+
+static struct i2c_driver iqs5xx_i2c_driver = {
+ .driver = {
+ .name = "iqs5xx",
+ .of_match_table = iqs5xx_of_match,
+ .pm = pm_sleep_ptr(&iqs5xx_pm),
+ },
+ .id_table = iqs5xx_id,
+ .probe = iqs5xx_probe,
+};
+module_i2c_driver(iqs5xx_i2c_driver);
+
+MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
+MODULE_DESCRIPTION("Azoteq IQS550/572/525 Trackpad/Touchscreen Controller");
+MODULE_LICENSE("GPL");