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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | // SPDX-License-Identifier: GPL-2.0-only /* * Microchip AR1020 and AR1021 driver for I2C * * Author: Christian Gmeiner <christian.gmeiner@gmail.com> */ #include <linux/bitops.h> #include <linux/module.h> #include <linux/input.h> #include <linux/of.h> #include <linux/i2c.h> #include <linux/irq.h> #include <linux/interrupt.h> #define AR1021_TOUCH_PKG_SIZE 5 #define AR1021_MAX_X 4095 #define AR1021_MAX_Y 4095 #define AR1021_CMD 0x55 #define AR1021_CMD_ENABLE_TOUCH 0x12 struct ar1021_i2c { struct i2c_client *client; struct input_dev *input; u8 data[AR1021_TOUCH_PKG_SIZE]; }; static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id) { struct ar1021_i2c *ar1021 = dev_id; struct input_dev *input = ar1021->input; u8 *data = ar1021->data; unsigned int x, y, button; int retval; retval = i2c_master_recv(ar1021->client, ar1021->data, sizeof(ar1021->data)); if (retval != sizeof(ar1021->data)) goto out; /* sync bit set ? */ if (!(data[0] & BIT(7))) goto out; button = data[0] & BIT(0); x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f); y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f); input_report_abs(input, ABS_X, x); input_report_abs(input, ABS_Y, y); input_report_key(input, BTN_TOUCH, button); input_sync(input); out: return IRQ_HANDLED; } static int ar1021_i2c_open(struct input_dev *dev) { static const u8 cmd_enable_touch[] = { AR1021_CMD, 0x01, /* number of bytes after this */ AR1021_CMD_ENABLE_TOUCH }; struct ar1021_i2c *ar1021 = input_get_drvdata(dev); struct i2c_client *client = ar1021->client; int error; error = i2c_master_send(ar1021->client, cmd_enable_touch, sizeof(cmd_enable_touch)); if (error < 0) return error; enable_irq(client->irq); return 0; } static void ar1021_i2c_close(struct input_dev *dev) { struct ar1021_i2c *ar1021 = input_get_drvdata(dev); struct i2c_client *client = ar1021->client; disable_irq(client->irq); } static int ar1021_i2c_probe(struct i2c_client *client) { struct ar1021_i2c *ar1021; struct input_dev *input; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "i2c_check_functionality error\n"); return -ENXIO; } ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL); if (!ar1021) return -ENOMEM; input = devm_input_allocate_device(&client->dev); if (!input) return -ENOMEM; ar1021->client = client; ar1021->input = input; input->name = "ar1021 I2C Touchscreen"; input->id.bustype = BUS_I2C; input->dev.parent = &client->dev; input->open = ar1021_i2c_open; input->close = ar1021_i2c_close; __set_bit(INPUT_PROP_DIRECT, input->propbit); input_set_capability(input, EV_KEY, BTN_TOUCH); input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0); input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0); input_set_drvdata(input, ar1021); error = devm_request_threaded_irq(&client->dev, client->irq, NULL, ar1021_i2c_irq, IRQF_ONESHOT | IRQF_NO_AUTOEN, "ar1021_i2c", ar1021); if (error) { dev_err(&client->dev, "Failed to enable IRQ, error: %d\n", error); return error; } error = input_register_device(ar1021->input); if (error) { dev_err(&client->dev, "Failed to register input device, error: %d\n", error); return error; } return 0; } static int ar1021_i2c_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); disable_irq(client->irq); return 0; } static int ar1021_i2c_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); enable_irq(client->irq); return 0; } static DEFINE_SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume); static const struct i2c_device_id ar1021_i2c_id[] = { { "ar1021", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id); static const struct of_device_id ar1021_i2c_of_match[] = { { .compatible = "microchip,ar1021-i2c", }, { } }; MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match); static struct i2c_driver ar1021_i2c_driver = { .driver = { .name = "ar1021_i2c", .pm = pm_sleep_ptr(&ar1021_i2c_pm), .of_match_table = ar1021_i2c_of_match, }, .probe = ar1021_i2c_probe, .id_table = ar1021_i2c_id, }; module_i2c_driver(ar1021_i2c_driver); MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>"); MODULE_DESCRIPTION("Microchip AR1020 and AR1021 I2C Driver"); MODULE_LICENSE("GPL"); |