1 // SPDX-License-Identifier: GPL-2.0
19 #include "atmel-i2c.h"
24 	struct atmel_i2c_client_priv *i2c_priv = work_data->ctx;  in atmel_sha204a_rng_done()
28 		dev_warn_ratelimited(&i2c_priv->client->dev,  in atmel_sha204a_rng_done()
32 	rng->priv = (unsigned long)work_data;  in atmel_sha204a_rng_done()
33 	atomic_dec(&i2c_priv->tfm_count);  in atmel_sha204a_rng_done()
37 					      size_t max)  in atmel_sha204a_rng_read_nonblocking()  argument
45 	if (!atomic_add_unless(&i2c_priv->tfm_count, 1, 1))  in atmel_sha204a_rng_read_nonblocking()
48 	if (rng->priv) {  in atmel_sha204a_rng_read_nonblocking()
49 		work_data = (struct atmel_i2c_work_data *)rng->priv;  in atmel_sha204a_rng_read_nonblocking()
50 		max = min(sizeof(work_data->cmd.data), max);  in atmel_sha204a_rng_read_nonblocking()
51 		memcpy(data, &work_data->cmd.data, max);  in atmel_sha204a_rng_read_nonblocking()
52 		rng->priv = 0;  in atmel_sha204a_rng_read_nonblocking()
56 			return -ENOMEM;  in atmel_sha204a_rng_read_nonblocking()
58 		work_data->ctx = i2c_priv;  in atmel_sha204a_rng_read_nonblocking()
59 		work_data->client = i2c_priv->client;  in atmel_sha204a_rng_read_nonblocking()
61 		max = 0;  in atmel_sha204a_rng_read_nonblocking()
64 	atmel_i2c_init_random_cmd(&work_data->cmd);  in atmel_sha204a_rng_read_nonblocking()
67 	return max;  in atmel_sha204a_rng_read_nonblocking()
70 static int atmel_sha204a_rng_read(struct hwrng *rng, void *data, size_t max,  in atmel_sha204a_rng_read()  argument
74 	struct atmel_i2c_cmd cmd;  in atmel_sha204a_rng_read()  local
78 		return atmel_sha204a_rng_read_nonblocking(rng, data, max);  in atmel_sha204a_rng_read()
82 	atmel_i2c_init_random_cmd(&cmd);  in atmel_sha204a_rng_read()
84 	ret = atmel_i2c_send_receive(i2c_priv->client, &cmd);  in atmel_sha204a_rng_read()
88 	max = min(sizeof(cmd.data), max);  in atmel_sha204a_rng_read()
89 	memcpy(data, cmd.data, max);  in atmel_sha204a_rng_read()
91 	return max;  in atmel_sha204a_rng_read()
96 	struct atmel_i2c_cmd cmd;  in atmel_sha204a_otp_read()  local
97 	int ret = -1;  in atmel_sha204a_otp_read()
99 	if (atmel_i2c_init_read_otp_cmd(&cmd, addr) < 0) {  in atmel_sha204a_otp_read()
100 		dev_err(&client->dev, "failed, invalid otp address %04X\n",  in atmel_sha204a_otp_read()
105 	ret = atmel_i2c_send_receive(client, &cmd);  in atmel_sha204a_otp_read()
107 	if (cmd.data[0] == 0xff) {  in atmel_sha204a_otp_read()
108 		dev_err(&client->dev, "failed, device not ready\n");  in atmel_sha204a_otp_read()
109 		return -EINVAL;  in atmel_sha204a_otp_read()
112 	memcpy(otp, cmd.data+1, 4);  in atmel_sha204a_otp_read()
136 	return str - buf;  in otp_show()
146 	.name = "atsha204a",
161 	memset(&i2c_priv->hwrng, 0, sizeof(i2c_priv->hwrng));  in atmel_sha204a_probe()
163 	i2c_priv->hwrng.name = dev_name(&client->dev);  in atmel_sha204a_probe()
164 	i2c_priv->hwrng.read = atmel_sha204a_rng_read;  in atmel_sha204a_probe()
166 	ret = devm_hwrng_register(&client->dev, &i2c_priv->hwrng);  in atmel_sha204a_probe()
168 		dev_warn(&client->dev, "failed to register RNG (%d)\n", ret);  in atmel_sha204a_probe()
171 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))  in atmel_sha204a_probe()
172 		return -ENODEV;  in atmel_sha204a_probe()
174 	ret = sysfs_create_group(&client->dev.kobj, &atmel_sha204a_groups);  in atmel_sha204a_probe()
176 		dev_err(&client->dev, "failed to register sysfs entry\n");  in atmel_sha204a_probe()
187 	if (atomic_read(&i2c_priv->tfm_count)) {  in atmel_sha204a_remove()
188 		dev_emerg(&client->dev, "Device is busy, will remove it anyhow\n");  in atmel_sha204a_remove()
192 	sysfs_remove_group(&client->dev.kobj, &atmel_sha204a_groups);  in atmel_sha204a_remove()
194 	kfree((void *)i2c_priv->hwrng.priv);  in atmel_sha204a_remove()
216 	.driver.name		= "atmel-sha204a",