Yassine Oudjana | fcc28e0 | 2021-09-09 22:12:29 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Cypress StreetFighter Touchkey Driver |
| 4 | * |
| 5 | * Copyright (c) 2021 Yassine Oudjana <y.oudjana@protonmail.com> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/bitmap.h> |
| 9 | #include <linux/bitops.h> |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/i2c.h> |
| 12 | #include <linux/input.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/pm.h> |
| 16 | #include <linux/regulator/consumer.h> |
| 17 | |
| 18 | #define CYPRESS_SF_DEV_NAME "cypress-sf" |
| 19 | |
| 20 | #define CYPRESS_SF_REG_BUTTON_STATUS 0x4a |
| 21 | |
| 22 | struct cypress_sf_data { |
| 23 | struct i2c_client *client; |
| 24 | struct input_dev *input_dev; |
| 25 | struct regulator_bulk_data regulators[2]; |
| 26 | u32 *keycodes; |
| 27 | unsigned long keystates; |
| 28 | int num_keys; |
| 29 | }; |
| 30 | |
| 31 | static irqreturn_t cypress_sf_irq_handler(int irq, void *devid) |
| 32 | { |
| 33 | struct cypress_sf_data *touchkey = devid; |
| 34 | unsigned long keystates, changed; |
| 35 | bool new_state; |
| 36 | int val, key; |
| 37 | |
| 38 | val = i2c_smbus_read_byte_data(touchkey->client, |
| 39 | CYPRESS_SF_REG_BUTTON_STATUS); |
| 40 | if (val < 0) { |
| 41 | dev_err(&touchkey->client->dev, |
| 42 | "Failed to read button status: %d", val); |
| 43 | return IRQ_NONE; |
| 44 | } |
| 45 | keystates = val; |
| 46 | |
| 47 | bitmap_xor(&changed, &keystates, &touchkey->keystates, |
| 48 | touchkey->num_keys); |
| 49 | |
| 50 | for_each_set_bit(key, &changed, touchkey->num_keys) { |
| 51 | new_state = keystates & BIT(key); |
| 52 | dev_dbg(&touchkey->client->dev, |
| 53 | "Key %d changed to %d", key, new_state); |
| 54 | input_report_key(touchkey->input_dev, |
| 55 | touchkey->keycodes[key], new_state); |
| 56 | } |
| 57 | |
| 58 | input_sync(touchkey->input_dev); |
| 59 | touchkey->keystates = keystates; |
| 60 | |
| 61 | return IRQ_HANDLED; |
| 62 | } |
| 63 | |
Zheyu Ma | fd0a4b3 | 2022-04-08 19:30:49 -0700 | [diff] [blame] | 64 | static void cypress_sf_disable_regulators(void *arg) |
| 65 | { |
| 66 | struct cypress_sf_data *touchkey = arg; |
| 67 | |
| 68 | regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators), |
| 69 | touchkey->regulators); |
| 70 | } |
| 71 | |
Yassine Oudjana | fcc28e0 | 2021-09-09 22:12:29 -0700 | [diff] [blame] | 72 | static int cypress_sf_probe(struct i2c_client *client) |
| 73 | { |
| 74 | struct cypress_sf_data *touchkey; |
| 75 | int key, error; |
| 76 | |
| 77 | touchkey = devm_kzalloc(&client->dev, sizeof(*touchkey), GFP_KERNEL); |
| 78 | if (!touchkey) |
| 79 | return -ENOMEM; |
| 80 | |
| 81 | touchkey->client = client; |
| 82 | i2c_set_clientdata(client, touchkey); |
| 83 | |
| 84 | touchkey->regulators[0].supply = "vdd"; |
| 85 | touchkey->regulators[1].supply = "avdd"; |
| 86 | |
| 87 | error = devm_regulator_bulk_get(&client->dev, |
| 88 | ARRAY_SIZE(touchkey->regulators), |
| 89 | touchkey->regulators); |
| 90 | if (error) { |
| 91 | dev_err(&client->dev, "Failed to get regulators: %d\n", error); |
| 92 | return error; |
| 93 | } |
| 94 | |
| 95 | touchkey->num_keys = device_property_read_u32_array(&client->dev, |
| 96 | "linux,keycodes", |
| 97 | NULL, 0); |
| 98 | if (touchkey->num_keys < 0) { |
| 99 | /* Default key count */ |
| 100 | touchkey->num_keys = 2; |
| 101 | } |
| 102 | |
| 103 | touchkey->keycodes = devm_kcalloc(&client->dev, |
| 104 | touchkey->num_keys, |
| 105 | sizeof(*touchkey->keycodes), |
| 106 | GFP_KERNEL); |
| 107 | if (!touchkey->keycodes) |
| 108 | return -ENOMEM; |
| 109 | |
| 110 | error = device_property_read_u32_array(&client->dev, "linux,keycodes", |
| 111 | touchkey->keycodes, |
| 112 | touchkey->num_keys); |
| 113 | |
| 114 | if (error) { |
| 115 | dev_warn(&client->dev, |
| 116 | "Failed to read keycodes: %d, using defaults\n", |
| 117 | error); |
| 118 | |
| 119 | /* Default keycodes */ |
| 120 | touchkey->keycodes[0] = KEY_BACK; |
| 121 | touchkey->keycodes[1] = KEY_MENU; |
| 122 | } |
| 123 | |
| 124 | error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators), |
| 125 | touchkey->regulators); |
| 126 | if (error) { |
| 127 | dev_err(&client->dev, |
| 128 | "Failed to enable regulators: %d\n", error); |
| 129 | return error; |
| 130 | } |
| 131 | |
Zheyu Ma | fd0a4b3 | 2022-04-08 19:30:49 -0700 | [diff] [blame] | 132 | error = devm_add_action_or_reset(&client->dev, |
| 133 | cypress_sf_disable_regulators, |
| 134 | touchkey); |
| 135 | if (error) |
| 136 | return error; |
| 137 | |
Yassine Oudjana | fcc28e0 | 2021-09-09 22:12:29 -0700 | [diff] [blame] | 138 | touchkey->input_dev = devm_input_allocate_device(&client->dev); |
| 139 | if (!touchkey->input_dev) { |
| 140 | dev_err(&client->dev, "Failed to allocate input device\n"); |
| 141 | return -ENOMEM; |
| 142 | } |
| 143 | |
| 144 | touchkey->input_dev->name = CYPRESS_SF_DEV_NAME; |
| 145 | touchkey->input_dev->id.bustype = BUS_I2C; |
| 146 | |
| 147 | for (key = 0; key < touchkey->num_keys; ++key) |
| 148 | input_set_capability(touchkey->input_dev, |
| 149 | EV_KEY, touchkey->keycodes[key]); |
| 150 | |
| 151 | error = input_register_device(touchkey->input_dev); |
| 152 | if (error) { |
| 153 | dev_err(&client->dev, |
| 154 | "Failed to register input device: %d\n", error); |
| 155 | return error; |
| 156 | } |
| 157 | |
| 158 | error = devm_request_threaded_irq(&client->dev, client->irq, |
| 159 | NULL, cypress_sf_irq_handler, |
| 160 | IRQF_ONESHOT, |
| 161 | CYPRESS_SF_DEV_NAME, touchkey); |
| 162 | if (error) { |
| 163 | dev_err(&client->dev, |
| 164 | "Failed to register threaded irq: %d", error); |
| 165 | return error; |
| 166 | } |
| 167 | |
| 168 | return 0; |
| 169 | }; |
| 170 | |
Jonathan Cameron | fbfb262 | 2022-12-04 18:08:13 +0000 | [diff] [blame] | 171 | static int cypress_sf_suspend(struct device *dev) |
Yassine Oudjana | fcc28e0 | 2021-09-09 22:12:29 -0700 | [diff] [blame] | 172 | { |
| 173 | struct i2c_client *client = to_i2c_client(dev); |
| 174 | struct cypress_sf_data *touchkey = i2c_get_clientdata(client); |
| 175 | int error; |
| 176 | |
| 177 | disable_irq(client->irq); |
| 178 | |
| 179 | error = regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators), |
| 180 | touchkey->regulators); |
| 181 | if (error) { |
| 182 | dev_err(dev, "Failed to disable regulators: %d", error); |
| 183 | enable_irq(client->irq); |
| 184 | return error; |
| 185 | } |
| 186 | |
| 187 | return 0; |
| 188 | } |
| 189 | |
Jonathan Cameron | fbfb262 | 2022-12-04 18:08:13 +0000 | [diff] [blame] | 190 | static int cypress_sf_resume(struct device *dev) |
Yassine Oudjana | fcc28e0 | 2021-09-09 22:12:29 -0700 | [diff] [blame] | 191 | { |
| 192 | struct i2c_client *client = to_i2c_client(dev); |
| 193 | struct cypress_sf_data *touchkey = i2c_get_clientdata(client); |
| 194 | int error; |
| 195 | |
| 196 | error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators), |
| 197 | touchkey->regulators); |
| 198 | if (error) { |
| 199 | dev_err(dev, "Failed to enable regulators: %d", error); |
| 200 | return error; |
| 201 | } |
| 202 | |
| 203 | enable_irq(client->irq); |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
Jonathan Cameron | fbfb262 | 2022-12-04 18:08:13 +0000 | [diff] [blame] | 208 | static DEFINE_SIMPLE_DEV_PM_OPS(cypress_sf_pm_ops, |
| 209 | cypress_sf_suspend, cypress_sf_resume); |
Yassine Oudjana | fcc28e0 | 2021-09-09 22:12:29 -0700 | [diff] [blame] | 210 | |
| 211 | static struct i2c_device_id cypress_sf_id_table[] = { |
| 212 | { CYPRESS_SF_DEV_NAME, 0 }, |
| 213 | { } |
| 214 | }; |
| 215 | MODULE_DEVICE_TABLE(i2c, cypress_sf_id_table); |
| 216 | |
| 217 | #ifdef CONFIG_OF |
| 218 | static const struct of_device_id cypress_sf_of_match[] = { |
| 219 | { .compatible = "cypress,sf3155", }, |
| 220 | { }, |
| 221 | }; |
| 222 | MODULE_DEVICE_TABLE(of, cypress_sf_of_match); |
| 223 | #endif |
| 224 | |
| 225 | static struct i2c_driver cypress_sf_driver = { |
| 226 | .driver = { |
| 227 | .name = CYPRESS_SF_DEV_NAME, |
Jonathan Cameron | fbfb262 | 2022-12-04 18:08:13 +0000 | [diff] [blame] | 228 | .pm = pm_sleep_ptr(&cypress_sf_pm_ops), |
Yassine Oudjana | fcc28e0 | 2021-09-09 22:12:29 -0700 | [diff] [blame] | 229 | .of_match_table = of_match_ptr(cypress_sf_of_match), |
| 230 | }, |
| 231 | .id_table = cypress_sf_id_table, |
| 232 | .probe_new = cypress_sf_probe, |
| 233 | }; |
| 234 | module_i2c_driver(cypress_sf_driver); |
| 235 | |
| 236 | MODULE_AUTHOR("Yassine Oudjana <y.oudjana@protonmail.com>"); |
| 237 | MODULE_DESCRIPTION("Cypress StreetFighter Touchkey Driver"); |
| 238 | MODULE_LICENSE("GPL v2"); |