Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
12 kB · 486 lines
C
at master
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487// SPDX-License-Identifier: GPL-2.0/* * ST1232 Touchscreen Controller Driver * * Copyright (C) 2010 Renesas Solutions Corp. * Tony SIM <chinyeow.sim.xt@renesas.com> * * Using code from: * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c * Copyright (C) 2007 Google, Inc. */
#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/touch-overlay.h>#include <linux/input/touchscreen.h>#include <linux/interrupt.h>#include <linux/module.h>#include <linux/of.h>#include <linux/pm_qos.h>#include <linux/slab.h>#include <linux/types.h>#include <asm/byteorder.h>
#define ST1232_TS_NAME "st1232-ts"#define ST1633_TS_NAME "st1633-ts"
#define REG_FIRMWARE_VERSION 0x00#define REG_FIRMWARE_REVISION_3 0x0C
#define REG_STATUS 0x01 /* Device Status | Error Code */
#define STATUS_NORMAL 0x00#define STATUS_INIT 0x01#define STATUS_ERROR 0x02#define STATUS_AUTO_TUNING 0x03#define STATUS_IDLE 0x04#define STATUS_POWER_DOWN 0x05
#define ERROR_NONE 0x00#define ERROR_INVALID_ADDRESS 0x10#define ERROR_INVALID_VALUE 0x20#define ERROR_INVALID_PLATFORM 0x30
#define REG_XY_RESOLUTION 0x04#define REG_XY_COORDINATES 0x12#define ST_TS_MAX_FINGERS 10
struct st_chip_info { bool have_z; u16 max_area; u16 max_fingers;};
struct st1232_ts_data { struct i2c_client *client; struct input_dev *input_dev; struct touchscreen_properties prop; struct dev_pm_qos_request low_latency_req; struct gpio_desc *reset_gpio; const struct st_chip_info *chip_info; struct list_head touch_overlay_list; int read_buf_len; u8 *read_buf; u8 fw_version; u32 fw_revision;};
static ssize_t fw_version_show(struct device *dev, struct device_attribute *attr, char *buf){ struct i2c_client *client = to_i2c_client(dev); struct st1232_ts_data *st1232_ts = i2c_get_clientdata(client);
return sysfs_emit(buf, "%u\n", st1232_ts->fw_version);}
static ssize_t fw_revision_show(struct device *dev, struct device_attribute *attr, char *buf){ struct i2c_client *client = to_i2c_client(dev); struct st1232_ts_data *st1232_ts = i2c_get_clientdata(client);
return sysfs_emit(buf, "%08x\n", st1232_ts->fw_revision);}
static DEVICE_ATTR_RO(fw_version);static DEVICE_ATTR_RO(fw_revision);
static struct attribute *st1232_attrs[] = { &dev_attr_fw_version.attr, &dev_attr_fw_revision.attr, NULL,};ATTRIBUTE_GROUPS(st1232);
static int st1232_ts_read_data(struct st1232_ts_data *ts, u8 reg, unsigned int n){ struct i2c_client *client = ts->client; struct i2c_msg msg[] = { { .addr = client->addr, .len = sizeof(reg), .buf = ®, }, { .addr = client->addr, .flags = I2C_M_RD | I2C_M_DMA_SAFE, .len = n, .buf = ts->read_buf, } }; int ret;
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); if (ret != ARRAY_SIZE(msg)) return ret < 0 ? ret : -EIO;
return 0;}
static int st1232_ts_wait_ready(struct st1232_ts_data *ts){ unsigned int retries; int error;
for (retries = 100; retries; retries--) { error = st1232_ts_read_data(ts, REG_STATUS, 1); if (!error) { switch (ts->read_buf[0]) { case STATUS_NORMAL | ERROR_NONE: case STATUS_IDLE | ERROR_NONE: return 0; } }
usleep_range(1000, 2000); }
return -ENXIO;}
static int st1232_ts_read_fw_version(struct st1232_ts_data *ts, u8 *fw_version, u32 *fw_revision){ int error;
/* select firmware version register */ error = st1232_ts_read_data(ts, REG_FIRMWARE_VERSION, 1); if (error) return error; *fw_version = ts->read_buf[0];
/* select firmware revision register */ error = st1232_ts_read_data(ts, REG_FIRMWARE_REVISION_3, 4); if (error) return error; *fw_revision = le32_to_cpup((__le32 *)ts->read_buf);
return 0;}
static int st1232_ts_read_resolution(struct st1232_ts_data *ts, u16 *max_x, u16 *max_y){ u8 *buf; int error;
/* select resolution register */ error = st1232_ts_read_data(ts, REG_XY_RESOLUTION, 3); if (error) return error;
buf = ts->read_buf;
*max_x = (((buf[0] & 0x0070) << 4) | buf[1]) - 1; *max_y = (((buf[0] & 0x0007) << 8) | buf[2]) - 1;
return 0;}
static int st1232_ts_parse_and_report(struct st1232_ts_data *ts){ struct input_dev *input = ts->input_dev; struct input_mt_pos pos[ST_TS_MAX_FINGERS]; u8 z[ST_TS_MAX_FINGERS]; int slots[ST_TS_MAX_FINGERS]; int n_contacts = 0; int i;
for (i = 0; i < ts->chip_info->max_fingers; i++) { u8 *buf = &ts->read_buf[i * 4];
if (buf[0] & BIT(7)) { unsigned int x = ((buf[0] & 0x70) << 4) | buf[1]; unsigned int y = ((buf[0] & 0x07) << 8) | buf[2];
touchscreen_set_mt_pos(&pos[n_contacts], &ts->prop, x, y);
/* st1232 includes a z-axis / touch strength */ if (ts->chip_info->have_z) z[n_contacts] = ts->read_buf[i + 6];
n_contacts++; } }
input_mt_assign_slots(input, slots, pos, n_contacts, 0); for (i = 0; i < n_contacts; i++) { if (touch_overlay_process_contact(&ts->touch_overlay_list, input, &pos[i], slots[i])) continue;
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); if (ts->chip_info->have_z) input_report_abs(input, ABS_MT_TOUCH_MAJOR, z[i]); }
touch_overlay_sync_frame(&ts->touch_overlay_list, input); input_mt_sync_frame(input); input_sync(input);
return n_contacts;}
static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id){ struct st1232_ts_data *ts = dev_id; int count; int error;
error = st1232_ts_read_data(ts, REG_XY_COORDINATES, ts->read_buf_len); if (error) goto out;
count = st1232_ts_parse_and_report(ts); if (!count) { if (ts->low_latency_req.dev) { dev_pm_qos_remove_request(&ts->low_latency_req); ts->low_latency_req.dev = NULL; } } else if (!ts->low_latency_req.dev) { /* First contact, request 100 us latency. */ dev_pm_qos_add_ancestor_request(&ts->client->dev, &ts->low_latency_req, DEV_PM_QOS_RESUME_LATENCY, 100); }
out: return IRQ_HANDLED;}
static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron){ if (ts->reset_gpio) gpiod_set_value_cansleep(ts->reset_gpio, !poweron);}
static void st1232_ts_power_off(void *data){ st1232_ts_power(data, false);}
static const struct st_chip_info st1232_chip_info = { .have_z = true, .max_area = 0xff, .max_fingers = 2,};
static const struct st_chip_info st1633_chip_info = { .have_z = false, .max_area = 0x00, .max_fingers = 5,};
static int st1232_ts_probe(struct i2c_client *client){ const struct i2c_device_id *id = i2c_client_get_device_id(client); const struct st_chip_info *match; struct st1232_ts_data *ts; struct input_dev *input_dev; u16 max_x, max_y; int error;
match = device_get_match_data(&client->dev); if (!match && id) match = (const void *)id->driver_data; if (!match) { dev_err(&client->dev, "unknown device model\n"); return -ENODEV; }
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "need I2C_FUNC_I2C\n"); return -EIO; }
if (!client->irq) { dev_err(&client->dev, "no IRQ?\n"); return -EINVAL; }
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); if (!ts) return -ENOMEM;
ts->chip_info = match;
/* allocate a buffer according to the number of registers to read */ ts->read_buf_len = ts->chip_info->max_fingers * 4; ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL); if (!ts->read_buf) return -ENOMEM;
input_dev = devm_input_allocate_device(&client->dev); if (!input_dev) return -ENOMEM;
ts->client = client; ts->input_dev = input_dev;
ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL, GPIOD_OUT_HIGH); if (IS_ERR(ts->reset_gpio)) { error = PTR_ERR(ts->reset_gpio); dev_err(&client->dev, "Unable to request GPIO pin: %d.\n", error); return error; }
st1232_ts_power(ts, true);
error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts); if (error) { dev_err(&client->dev, "Failed to install power off action: %d\n", error); return error; }
input_dev->name = "st1232-touchscreen"; input_dev->id.bustype = BUS_I2C;
/* Wait until device is ready */ error = st1232_ts_wait_ready(ts); if (error) return error;
/* Read firmware version from the chip */ error = st1232_ts_read_fw_version(ts, &ts->fw_version, &ts->fw_revision); if (error) { dev_err(&client->dev, "Failed to read firmware version: %d\n", error); return error; } dev_dbg(&client->dev, "Detected firmware version %u, rev %08x\n", ts->fw_version, ts->fw_revision);
if (ts->chip_info->have_z) input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, ts->chip_info->max_area, 0, 0);
/* map overlay objects if defined in the device tree */ INIT_LIST_HEAD(&ts->touch_overlay_list); error = touch_overlay_map(&ts->touch_overlay_list, input_dev); if (error) return error;
if (touch_overlay_mapped_touchscreen(&ts->touch_overlay_list)) { /* Read resolution from the overlay touchscreen if defined */ touch_overlay_get_touchscreen_abs(&ts->touch_overlay_list, &max_x, &max_y); } else { /* Read resolution from the chip */ error = st1232_ts_read_resolution(ts, &max_x, &max_y); if (error) { dev_err(&client->dev, "Failed to read resolution: %d\n", error); return error; } }
input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0); input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
touchscreen_parse_properties(input_dev, true, &ts->prop);
error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers, INPUT_MT_DIRECT | INPUT_MT_TRACK | INPUT_MT_DROP_UNUSED); if (error) { dev_err(&client->dev, "failed to initialize MT slots\n"); return error; }
error = devm_request_threaded_irq(&client->dev, client->irq, NULL, st1232_ts_irq_handler, IRQF_ONESHOT, client->name, ts); if (error) { dev_err(&client->dev, "Failed to register interrupt\n"); return error; }
error = input_register_device(ts->input_dev); if (error) { dev_err(&client->dev, "Unable to register %s input device\n", input_dev->name); return error; }
i2c_set_clientdata(client, ts);
return 0;}
static int st1232_ts_suspend(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); struct st1232_ts_data *ts = i2c_get_clientdata(client);
disable_irq(client->irq);
if (!device_may_wakeup(&client->dev)) st1232_ts_power(ts, false);
return 0;}
static int st1232_ts_resume(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); struct st1232_ts_data *ts = i2c_get_clientdata(client);
if (!device_may_wakeup(&client->dev)) st1232_ts_power(ts, true);
enable_irq(client->irq);
return 0;}
static DEFINE_SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops, st1232_ts_suspend, st1232_ts_resume);
static const struct i2c_device_id st1232_ts_id[] = { { .name = ST1232_TS_NAME, .driver_data = (unsigned long)&st1232_chip_info }, { .name = ST1633_TS_NAME, .driver_data = (unsigned long)&st1633_chip_info }, { }};MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
static const struct of_device_id st1232_ts_dt_ids[] = { { .compatible = "sitronix,st1232", .data = &st1232_chip_info }, { .compatible = "sitronix,st1633", .data = &st1633_chip_info }, { }};MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
static struct i2c_driver st1232_ts_driver = { .probe = st1232_ts_probe, .id_table = st1232_ts_id, .driver = { .name = ST1232_TS_NAME, .of_match_table = st1232_ts_dt_ids, .dev_groups = st1232_groups, .probe_type = PROBE_PREFER_ASYNCHRONOUS, .pm = pm_sleep_ptr(&st1232_ts_pm_ops), },};
module_i2c_driver(st1232_ts_driver);
MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");MODULE_LICENSE("GPL v2");