1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * isl29020.c - Intersil  ALS Driver
4 *
5 * Copyright (C) 2008 Intel Corp
6 *
7 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
12 */
13
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/i2c.h>
17#include <linux/err.h>
18#include <linux/delay.h>
19#include <linux/sysfs.h>
20#include <linux/pm_runtime.h>
21
22static DEFINE_MUTEX(mutex);
23
24static ssize_t als_sensing_range_show(struct device *dev,
25			struct device_attribute *attr,  char *buf)
26{
27	struct i2c_client *client = to_i2c_client(dev);
28	int  val;
29
30	val = i2c_smbus_read_byte_data(client, 0x00);
31
32	if (val < 0)
33		return val;
34	return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
35
36}
37
38static ssize_t als_lux_input_data_show(struct device *dev,
39			struct device_attribute *attr, char *buf)
40{
41	struct i2c_client *client = to_i2c_client(dev);
42	int ret_val, val;
43	unsigned long int lux;
44	int temp;
45
46	pm_runtime_get_sync(dev);
47	msleep(100);
48
49	mutex_lock(&mutex);
50	temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
51	if (temp < 0) {
52		pm_runtime_put_sync(dev);
53		mutex_unlock(&mutex);
54		return temp;
55	}
56
57	ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
58	mutex_unlock(&mutex);
59
60	if (ret_val < 0) {
61		pm_runtime_put_sync(dev);
62		return ret_val;
63	}
64
65	ret_val |= temp << 8;
66	val = i2c_smbus_read_byte_data(client, 0x00);
67	pm_runtime_put_sync(dev);
68	if (val < 0)
69		return val;
70	lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
71	return sprintf(buf, "%ld\n", lux);
72}
73
74static ssize_t als_sensing_range_store(struct device *dev,
75		struct device_attribute *attr, const  char *buf, size_t count)
76{
77	struct i2c_client *client = to_i2c_client(dev);
78	int ret_val;
79	unsigned long val;
80
81	ret_val = kstrtoul(buf, 10, &val);
82	if (ret_val)
83		return ret_val;
84
85	if (val < 1 || val > 64000)
86		return -EINVAL;
87
88	/* Pick the smallest sensor range that will meet our requirements */
89	if (val <= 1000)
90		val = 1;
91	else if (val <= 4000)
92		val = 2;
93	else if (val <= 16000)
94		val = 3;
95	else
96		val = 4;
97
98	ret_val = i2c_smbus_read_byte_data(client, 0x00);
99	if (ret_val < 0)
100		return ret_val;
101
102	ret_val &= 0xFC; /*reset the bit before setting them */
103	ret_val |= val - 1;
104	ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
105
106	if (ret_val < 0)
107		return ret_val;
108	return count;
109}
110
111static void als_set_power_state(struct i2c_client *client, int enable)
112{
113	int ret_val;
114
115	ret_val = i2c_smbus_read_byte_data(client, 0x00);
116	if (ret_val < 0)
117		return;
118
119	if (enable)
120		ret_val |= 0x80;
121	else
122		ret_val &= 0x7F;
123
124	i2c_smbus_write_byte_data(client, 0x00, ret_val);
125}
126
127static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
128	als_sensing_range_show, als_sensing_range_store);
129static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
130
131static struct attribute *mid_att_als[] = {
132	&dev_attr_lux0_sensor_range.attr,
133	&dev_attr_lux0_input.attr,
134	NULL
135};
136
137static const struct attribute_group m_als_gr = {
138	.name = "isl29020",
139	.attrs = mid_att_als
140};
141
142static int als_set_default_config(struct i2c_client *client)
143{
144	int retval;
145
146	retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
147	if (retval < 0) {
148		dev_err(&client->dev, "default write failed.");
149		return retval;
150	}
151	return 0;
152}
153
154static int  isl29020_probe(struct i2c_client *client)
155{
156	int res;
157
158	res = als_set_default_config(client);
159	if (res <  0)
160		return res;
161
162	res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
163	if (res) {
164		dev_err(&client->dev, "isl29020: device create file failed\n");
165		return res;
166	}
167	dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
168	als_set_power_state(client, 0);
169	pm_runtime_enable(&client->dev);
170	return res;
171}
172
173static void isl29020_remove(struct i2c_client *client)
174{
175	pm_runtime_disable(&client->dev);
176	sysfs_remove_group(&client->dev.kobj, &m_als_gr);
177}
178
179static const struct i2c_device_id isl29020_id[] = {
180	{ "isl29020", 0 },
181	{ }
182};
183
184MODULE_DEVICE_TABLE(i2c, isl29020_id);
185
186#ifdef CONFIG_PM
187
188static int isl29020_runtime_suspend(struct device *dev)
189{
190	struct i2c_client *client = to_i2c_client(dev);
191	als_set_power_state(client, 0);
192	return 0;
193}
194
195static int isl29020_runtime_resume(struct device *dev)
196{
197	struct i2c_client *client = to_i2c_client(dev);
198	als_set_power_state(client, 1);
199	return 0;
200}
201
202static const struct dev_pm_ops isl29020_pm_ops = {
203	.runtime_suspend = isl29020_runtime_suspend,
204	.runtime_resume = isl29020_runtime_resume,
205};
206
207#define ISL29020_PM_OPS (&isl29020_pm_ops)
208#else	/* CONFIG_PM */
209#define ISL29020_PM_OPS NULL
210#endif	/* CONFIG_PM */
211
212static struct i2c_driver isl29020_driver = {
213	.driver = {
214		.name = "isl29020",
215		.pm = ISL29020_PM_OPS,
216	},
217	.probe = isl29020_probe,
218	.remove = isl29020_remove,
219	.id_table = isl29020_id,
220};
221
222module_i2c_driver(isl29020_driver);
223
224MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
225MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
226MODULE_LICENSE("GPL v2");
227