| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Naveen Kumar Gaddipati | 1740 | 64.47% | 2 | 11.11% |
| Dmitry Torokhov | 861 | 31.90% | 8 | 44.44% |
| Linus Walleij | 72 | 2.67% | 1 | 5.56% |
| Lee Jones | 18 | 0.67% | 2 | 11.11% |
| Thomas Gleixner | 2 | 0.07% | 1 | 5.56% |
| Axel Lin | 2 | 0.07% | 1 | 5.56% |
| Paul Gortmaker | 2 | 0.07% | 1 | 5.56% |
| Lars-Peter Clausen | 1 | 0.04% | 1 | 5.56% |
| David Sterba | 1 | 0.04% | 1 | 5.56% |
| Total | 2699 | 18 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) ST-Ericsson SA 2010 * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson */ #include <linux/bitops.h> #include <linux/delay.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/module.h> #include <linux/property.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <linux/types.h> #define MAX_FINGERS 2 #define RESET_DELAY 30 #define PENUP_TIMEOUT (10) #define DELTA_MIN 16 #define MASK_BITS 0x03 #define SHIFT_8 8 #define SHIFT_2 2 #define LENGTH_OF_BUFFER 11 #define I2C_RETRY_COUNT 5 #define BU21013_SENSORS_BTN_0_7_REG 0x70 #define BU21013_SENSORS_BTN_8_15_REG 0x71 #define BU21013_SENSORS_BTN_16_23_REG 0x72 #define BU21013_X1_POS_MSB_REG 0x73 #define BU21013_X1_POS_LSB_REG 0x74 #define BU21013_Y1_POS_MSB_REG 0x75 #define BU21013_Y1_POS_LSB_REG 0x76 #define BU21013_X2_POS_MSB_REG 0x77 #define BU21013_X2_POS_LSB_REG 0x78 #define BU21013_Y2_POS_MSB_REG 0x79 #define BU21013_Y2_POS_LSB_REG 0x7A #define BU21013_INT_CLR_REG 0xE8 #define BU21013_INT_MODE_REG 0xE9 #define BU21013_GAIN_REG 0xEA #define BU21013_OFFSET_MODE_REG 0xEB #define BU21013_XY_EDGE_REG 0xEC #define BU21013_RESET_REG 0xED #define BU21013_CALIB_REG 0xEE #define BU21013_DONE_REG 0xEF #define BU21013_SENSOR_0_7_REG 0xF0 #define BU21013_SENSOR_8_15_REG 0xF1 #define BU21013_SENSOR_16_23_REG 0xF2 #define BU21013_POS_MODE1_REG 0xF3 #define BU21013_POS_MODE2_REG 0xF4 #define BU21013_CLK_MODE_REG 0xF5 #define BU21013_IDLE_REG 0xFA #define BU21013_FILTER_REG 0xFB #define BU21013_TH_ON_REG 0xFC #define BU21013_TH_OFF_REG 0xFD #define BU21013_RESET_ENABLE 0x01 #define BU21013_SENSORS_EN_0_7 0x3F #define BU21013_SENSORS_EN_8_15 0xFC #define BU21013_SENSORS_EN_16_23 0x1F #define BU21013_POS_MODE1_0 0x02 #define BU21013_POS_MODE1_1 0x04 #define BU21013_POS_MODE1_2 0x08 #define BU21013_POS_MODE2_ZERO 0x01 #define BU21013_POS_MODE2_AVG1 0x02 #define BU21013_POS_MODE2_AVG2 0x04 #define BU21013_POS_MODE2_EN_XY 0x08 #define BU21013_POS_MODE2_EN_RAW 0x10 #define BU21013_POS_MODE2_MULTI 0x80 #define BU21013_CLK_MODE_DIV 0x01 #define BU21013_CLK_MODE_EXT 0x02 #define BU21013_CLK_MODE_CALIB 0x80 #define BU21013_IDLET_0 0x01 #define BU21013_IDLET_1 0x02 #define BU21013_IDLET_2 0x04 #define BU21013_IDLET_3 0x08 #define BU21013_IDLE_INTERMIT_EN 0x10 #define BU21013_DELTA_0_6 0x7F #define BU21013_FILTER_EN 0x80 #define BU21013_INT_MODE_LEVEL 0x00 #define BU21013_INT_MODE_EDGE 0x01 #define BU21013_GAIN_0 0x01 #define BU21013_GAIN_1 0x02 #define BU21013_GAIN_2 0x04 #define BU21013_OFFSET_MODE_DEFAULT 0x00 #define BU21013_OFFSET_MODE_MOVE 0x01 #define BU21013_OFFSET_MODE_DISABLE 0x02 #define BU21013_TH_ON_0 0x01 #define BU21013_TH_ON_1 0x02 #define BU21013_TH_ON_2 0x04 #define BU21013_TH_ON_3 0x08 #define BU21013_TH_ON_4 0x10 #define BU21013_TH_ON_5 0x20 #define BU21013_TH_ON_6 0x40 #define BU21013_TH_ON_7 0x80 #define BU21013_TH_ON_MAX 0xFF #define BU21013_TH_OFF_0 0x01 #define BU21013_TH_OFF_1 0x02 #define BU21013_TH_OFF_2 0x04 #define BU21013_TH_OFF_3 0x08 #define BU21013_TH_OFF_4 0x10 #define BU21013_TH_OFF_5 0x20 #define BU21013_TH_OFF_6 0x40 #define BU21013_TH_OFF_7 0x80 #define BU21013_TH_OFF_MAX 0xFF #define BU21013_X_EDGE_0 0x01 #define BU21013_X_EDGE_1 0x02 #define BU21013_X_EDGE_2 0x04 #define BU21013_X_EDGE_3 0x08 #define BU21013_Y_EDGE_0 0x10 #define BU21013_Y_EDGE_1 0x20 #define BU21013_Y_EDGE_2 0x40 #define BU21013_Y_EDGE_3 0x80 #define BU21013_DONE 0x01 #define BU21013_NUMBER_OF_X_SENSORS (6) #define BU21013_NUMBER_OF_Y_SENSORS (11) #define DRIVER_TP "bu21013_tp" /** * struct bu21013_ts - touch panel data structure * @client: pointer to the i2c client * @in_dev: pointer to the input device structure * @props: the device coordinate transformation properties * @regulator: pointer to the Regulator used for touch screen * @cs_gpiod: chip select GPIO line * @int_gpiod: touch interrupt GPIO line * @touch_x_max: maximum X coordinate reported by the device * @touch_y_max: maximum Y coordinate reported by the device * @x_flip: indicates that the driver should invert X coordinate before * reporting * @y_flip: indicates that the driver should invert Y coordinate before * reporting * @touch_stopped: touch stop flag * * Touch panel device data structure */ struct bu21013_ts { struct i2c_client *client; struct input_dev *in_dev; struct touchscreen_properties props; struct regulator *regulator; struct gpio_desc *cs_gpiod; struct gpio_desc *int_gpiod; u32 touch_x_max; u32 touch_y_max; bool x_flip; bool y_flip; bool touch_stopped; }; static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf) { int ret, i; for (i = 0; i < I2C_RETRY_COUNT; i++) { ret = i2c_smbus_read_i2c_block_data(ts->client, BU21013_SENSORS_BTN_0_7_REG, LENGTH_OF_BUFFER, buf); if (ret == LENGTH_OF_BUFFER) return 0; } return -EINVAL; } static int bu21013_do_touch_report(struct bu21013_ts *ts) { struct input_dev *input = ts->in_dev; struct input_mt_pos pos[MAX_FINGERS]; int slots[MAX_FINGERS]; u8 buf[LENGTH_OF_BUFFER]; bool has_x_sensors, has_y_sensors; int finger_down_count = 0; int i; if (bu21013_read_block_data(ts, buf) < 0) return -EINVAL; has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7); has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) | ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2); if (!has_x_sensors || !has_y_sensors) return 0; for (i = 0; i < MAX_FINGERS; i++) { const u8 *data = &buf[4 * i + 3]; unsigned int x, y; x = data[0] << SHIFT_2 | (data[1] & MASK_BITS); y = data[2] << SHIFT_2 | (data[3] & MASK_BITS); if (x != 0 && y != 0) touchscreen_set_mt_pos(&pos[finger_down_count++], &ts->props, x, y); } if (finger_down_count == 2 && (abs(pos[0].x - pos[1].x) < DELTA_MIN || abs(pos[0].y - pos[1].y) < DELTA_MIN)) { return 0; } input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN); for (i = 0; i < finger_down_count; i++) { input_mt_slot(input, slots[i]); input_mt_report_slot_state(input, MT_TOOL_FINGER, true); input_report_abs(input, ABS_MT_POSITION_X, pos[i].x); input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y); } input_mt_sync_frame(input); input_sync(input); return 0; } static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) { struct bu21013_ts *ts = device_data; int keep_polling; int error; do { error = bu21013_do_touch_report(ts); if (error) { dev_err(&ts->client->dev, "%s failed\n", __func__); break; } if (unlikely(ts->touch_stopped)) break; keep_polling = ts->int_gpiod ? gpiod_get_value(ts->int_gpiod) : false; if (keep_polling) usleep_range(2000, 2500); } while (keep_polling); return IRQ_HANDLED; } static int bu21013_init_chip(struct bu21013_ts *ts) { struct i2c_client *client = ts->client; int error; error = i2c_smbus_write_byte_data(client, BU21013_RESET_REG, BU21013_RESET_ENABLE); if (error) { dev_err(&client->dev, "BU21013_RESET reg write failed\n"); return error; } msleep(RESET_DELAY); error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_0_7_REG, BU21013_SENSORS_EN_0_7); if (error) { dev_err(&client->dev, "BU21013_SENSOR_0_7 reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_8_15_REG, BU21013_SENSORS_EN_8_15); if (error) { dev_err(&client->dev, "BU21013_SENSOR_8_15 reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_16_23_REG, BU21013_SENSORS_EN_16_23); if (error) { dev_err(&client->dev, "BU21013_SENSOR_16_23 reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE1_REG, BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1); if (error) { dev_err(&client->dev, "BU21013_POS_MODE1 reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE2_REG, BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 | BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW | BU21013_POS_MODE2_MULTI); if (error) { dev_err(&client->dev, "BU21013_POS_MODE2 reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_CLK_MODE_REG, BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB); if (error) { dev_err(&client->dev, "BU21013_CLK_MODE reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_IDLE_REG, BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN); if (error) { dev_err(&client->dev, "BU21013_IDLE reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_INT_MODE_REG, BU21013_INT_MODE_LEVEL); if (error) { dev_err(&client->dev, "BU21013_INT_MODE reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_FILTER_REG, BU21013_DELTA_0_6 | BU21013_FILTER_EN); if (error) { dev_err(&client->dev, "BU21013_FILTER reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_TH_ON_REG, BU21013_TH_ON_5); if (error) { dev_err(&client->dev, "BU21013_TH_ON reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_TH_OFF_REG, BU21013_TH_OFF_4 | BU21013_TH_OFF_3); if (error) { dev_err(&client->dev, "BU21013_TH_OFF reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_GAIN_REG, BU21013_GAIN_0 | BU21013_GAIN_1); if (error) { dev_err(&client->dev, "BU21013_GAIN reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_OFFSET_MODE_REG, BU21013_OFFSET_MODE_DEFAULT); if (error) { dev_err(&client->dev, "BU21013_OFFSET_MODE reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_XY_EDGE_REG, BU21013_X_EDGE_0 | BU21013_X_EDGE_2 | BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3); if (error) { dev_err(&client->dev, "BU21013_XY_EDGE reg write failed\n"); return error; } error = i2c_smbus_write_byte_data(client, BU21013_DONE_REG, BU21013_DONE); if (error) { dev_err(&client->dev, "BU21013_REG_DONE reg write failed\n"); return error; } return 0; } static void bu21013_power_off(void *_ts) { struct bu21013_ts *ts = _ts; regulator_disable(ts->regulator); } static void bu21013_disable_chip(void *_ts) { struct bu21013_ts *ts = _ts; gpiod_set_value(ts->cs_gpiod, 0); } static int bu21013_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct bu21013_ts *ts; struct input_dev *in_dev; struct input_absinfo *info; u32 max_x = 0, max_y = 0; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { dev_err(&client->dev, "i2c smbus byte data not supported\n"); return -EIO; } if (!client->irq) { dev_err(&client->dev, "No IRQ set up\n"); return -EINVAL; } ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); if (!ts) return -ENOMEM; ts->client = client; ts->x_flip = device_property_read_bool(&client->dev, "rohm,flip-x"); ts->y_flip = device_property_read_bool(&client->dev, "rohm,flip-y"); in_dev = devm_input_allocate_device(&client->dev); if (!in_dev) { dev_err(&client->dev, "device memory alloc failed\n"); return -ENOMEM; } ts->in_dev = in_dev; input_set_drvdata(in_dev, ts); /* register the device to input subsystem */ in_dev->name = DRIVER_TP; in_dev->id.bustype = BUS_I2C; device_property_read_u32(&client->dev, "rohm,touch-max-x", &max_x); device_property_read_u32(&client->dev, "rohm,touch-max-y", &max_y); input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0); input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0); touchscreen_parse_properties(in_dev, true, &ts->props); /* Adjust for the legacy "flip" properties, if present */ if (!ts->props.invert_x && device_property_read_bool(&client->dev, "rohm,flip-x")) { info = &in_dev->absinfo[ABS_MT_POSITION_X]; info->maximum -= info->minimum; info->minimum = 0; } if (!ts->props.invert_y && device_property_read_bool(&client->dev, "rohm,flip-y")) { info = &in_dev->absinfo[ABS_MT_POSITION_Y]; info->maximum -= info->minimum; info->minimum = 0; } error = input_mt_init_slots(in_dev, MAX_FINGERS, INPUT_MT_DIRECT | INPUT_MT_TRACK | INPUT_MT_DROP_UNUSED); if (error) { dev_err(&client->dev, "failed to initialize MT slots"); return error; } ts->regulator = devm_regulator_get(&client->dev, "avdd"); if (IS_ERR(ts->regulator)) { dev_err(&client->dev, "regulator_get failed\n"); return PTR_ERR(ts->regulator); } error = regulator_enable(ts->regulator); if (error) { dev_err(&client->dev, "regulator enable failed\n"); return error; } error = devm_add_action_or_reset(&client->dev, bu21013_power_off, ts); if (error) { dev_err(&client->dev, "failed to install power off handler\n"); return error; } /* Named "CS" on the chip, DT binding is "reset" */ ts->cs_gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH); error = PTR_ERR_OR_ZERO(ts->cs_gpiod); if (error) { if (error != -EPROBE_DEFER) dev_err(&client->dev, "failed to get CS GPIO\n"); return error; } gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS"); error = devm_add_action_or_reset(&client->dev, bu21013_disable_chip, ts); if (error) { dev_err(&client->dev, "failed to install chip disable handler\n"); return error; } /* Named "INT" on the chip, DT binding is "touch" */ ts->int_gpiod = devm_gpiod_get_optional(&client->dev, "touch", GPIOD_IN); error = PTR_ERR_OR_ZERO(ts->int_gpiod); if (error) { if (error != -EPROBE_DEFER) dev_err(&client->dev, "failed to get INT GPIO\n"); return error; } if (ts->int_gpiod) gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT"); /* configure the touch panel controller */ error = bu21013_init_chip(ts); if (error) { dev_err(&client->dev, "error in bu21013 config\n"); return error; } error = devm_request_threaded_irq(&client->dev, client->irq, NULL, bu21013_gpio_irq, IRQF_ONESHOT, DRIVER_TP, ts); if (error) { dev_err(&client->dev, "request irq %d failed\n", client->irq); return error; } error = input_register_device(in_dev); if (error) { dev_err(&client->dev, "failed to register input device\n"); return error; } i2c_set_clientdata(client, ts); return 0; } static int bu21013_remove(struct i2c_client *client) { struct bu21013_ts *ts = i2c_get_clientdata(client); /* Make sure IRQ will exit quickly even if there is contact */ ts->touch_stopped = true; /* The resources will be freed by devm */ return 0; } static int __maybe_unused bu21013_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct bu21013_ts *ts = i2c_get_clientdata(client); ts->touch_stopped = true; mb(); disable_irq(client->irq); if (!device_may_wakeup(&client->dev)) regulator_disable(ts->regulator); return 0; } static int __maybe_unused bu21013_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct bu21013_ts *ts = i2c_get_clientdata(client); int error; if (!device_may_wakeup(&client->dev)) { error = regulator_enable(ts->regulator); if (error) { dev_err(&client->dev, "failed to re-enable regulator when resuming\n"); return error; } error = bu21013_init_chip(ts); if (error) { dev_err(&client->dev, "failed to reinitialize chip when resuming\n"); return error; } } ts->touch_stopped = false; mb(); enable_irq(client->irq); return 0; } static SIMPLE_DEV_PM_OPS(bu21013_dev_pm_ops, bu21013_suspend, bu21013_resume); static const struct i2c_device_id bu21013_id[] = { { DRIVER_TP, 0 }, { } }; MODULE_DEVICE_TABLE(i2c, bu21013_id); static struct i2c_driver bu21013_driver = { .driver = { .name = DRIVER_TP, .pm = &bu21013_dev_pm_ops, }, .probe = bu21013_probe, .remove = bu21013_remove, .id_table = bu21013_id, }; module_i2c_driver(bu21013_driver); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>"); MODULE_DESCRIPTION("bu21013 touch screen controller driver");
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