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1/*
2 * isl29020.c - Intersil ALS Driver
3 *
4 * Copyright (C) 2008 Intel Corp
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 *
22 * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/i2c.h>
29#include <linux/err.h>
30#include <linux/delay.h>
31#include <linux/sysfs.h>
32#include <linux/pm_runtime.h>
33
34static DEFINE_MUTEX(mutex);
35
36static ssize_t als_sensing_range_show(struct device *dev,
37 struct device_attribute *attr, char *buf)
38{
39 struct i2c_client *client = to_i2c_client(dev);
40 int val;
41
42 val = i2c_smbus_read_byte_data(client, 0x00);
43
44 if (val < 0)
45 return val;
46 return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
47
48}
49
50static ssize_t als_lux_input_data_show(struct device *dev,
51 struct device_attribute *attr, char *buf)
52{
53 struct i2c_client *client = to_i2c_client(dev);
54 int ret_val, val;
55 unsigned long int lux;
56 int temp;
57
58 pm_runtime_get_sync(dev);
59 msleep(100);
60
61 mutex_lock(&mutex);
62 temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
63 if (temp < 0) {
64 pm_runtime_put_sync(dev);
65 mutex_unlock(&mutex);
66 return temp;
67 }
68
69 ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
70 mutex_unlock(&mutex);
71
72 if (ret_val < 0) {
73 pm_runtime_put_sync(dev);
74 return ret_val;
75 }
76
77 ret_val |= temp << 8;
78 val = i2c_smbus_read_byte_data(client, 0x00);
79 pm_runtime_put_sync(dev);
80 if (val < 0)
81 return val;
82 lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
83 return sprintf(buf, "%ld\n", lux);
84}
85
86static ssize_t als_sensing_range_store(struct device *dev,
87 struct device_attribute *attr, const char *buf, size_t count)
88{
89 struct i2c_client *client = to_i2c_client(dev);
90 int ret_val;
91 unsigned long val;
92
93 if (strict_strtoul(buf, 10, &val))
94 return -EINVAL;
95 if (val < 1 || val > 64000)
96 return -EINVAL;
97
98 /* Pick the smallest sensor range that will meet our requirements */
99 if (val <= 1000)
100 val = 1;
101 else if (val <= 4000)
102 val = 2;
103 else if (val <= 16000)
104 val = 3;
105 else
106 val = 4;
107
108 ret_val = i2c_smbus_read_byte_data(client, 0x00);
109 if (ret_val < 0)
110 return ret_val;
111
112 ret_val &= 0xFC; /*reset the bit before setting them */
113 ret_val |= val - 1;
114 ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
115
116 if (ret_val < 0)
117 return ret_val;
118 return count;
119}
120
121static void als_set_power_state(struct i2c_client *client, int enable)
122{
123 int ret_val;
124
125 ret_val = i2c_smbus_read_byte_data(client, 0x00);
126 if (ret_val < 0)
127 return;
128
129 if (enable)
130 ret_val |= 0x80;
131 else
132 ret_val &= 0x7F;
133
134 i2c_smbus_write_byte_data(client, 0x00, ret_val);
135}
136
137static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
138 als_sensing_range_show, als_sensing_range_store);
139static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
140
141static struct attribute *mid_att_als[] = {
142 &dev_attr_lux0_sensor_range.attr,
143 &dev_attr_lux0_input.attr,
144 NULL
145};
146
147static struct attribute_group m_als_gr = {
148 .name = "isl29020",
149 .attrs = mid_att_als
150};
151
152static int als_set_default_config(struct i2c_client *client)
153{
154 int retval;
155
156 retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
157 if (retval < 0) {
158 dev_err(&client->dev, "default write failed.");
159 return retval;
160 }
161 return 0;;
162}
163
164static int isl29020_probe(struct i2c_client *client,
165 const struct i2c_device_id *id)
166{
167 int res;
168
169 res = als_set_default_config(client);
170 if (res < 0)
171 return res;
172
173 res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
174 if (res) {
175 dev_err(&client->dev, "isl29020: device create file failed\n");
176 return res;
177 }
178 dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
179 als_set_power_state(client, 0);
180 pm_runtime_enable(&client->dev);
181 return res;
182}
183
184static int isl29020_remove(struct i2c_client *client)
185{
186 sysfs_remove_group(&client->dev.kobj, &m_als_gr);
187 return 0;
188}
189
190static struct i2c_device_id isl29020_id[] = {
191 { "isl29020", 0 },
192 { }
193};
194
195MODULE_DEVICE_TABLE(i2c, isl29020_id);
196
197#ifdef CONFIG_PM
198
199static int isl29020_runtime_suspend(struct device *dev)
200{
201 struct i2c_client *client = to_i2c_client(dev);
202 als_set_power_state(client, 0);
203 return 0;
204}
205
206static int isl29020_runtime_resume(struct device *dev)
207{
208 struct i2c_client *client = to_i2c_client(dev);
209 als_set_power_state(client, 1);
210 return 0;
211}
212
213static const struct dev_pm_ops isl29020_pm_ops = {
214 .runtime_suspend = isl29020_runtime_suspend,
215 .runtime_resume = isl29020_runtime_resume,
216};
217
218#define ISL29020_PM_OPS (&isl29020_pm_ops)
219#else /* CONFIG_PM */
220#define ISL29020_PM_OPS NULL
221#endif /* CONFIG_PM */
222
223static struct i2c_driver isl29020_driver = {
224 .driver = {
225 .name = "isl29020",
226 .pm = ISL29020_PM_OPS,
227 },
228 .probe = isl29020_probe,
229 .remove = isl29020_remove,
230 .id_table = isl29020_id,
231};
232
233static int __init sensor_isl29020_init(void)
234{
235 return i2c_add_driver(&isl29020_driver);
236}
237
238static void __exit sensor_isl29020_exit(void)
239{
240 i2c_del_driver(&isl29020_driver);
241}
242
243module_init(sensor_isl29020_init);
244module_exit(sensor_isl29020_exit);
245
246MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
247MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
248MODULE_LICENSE("GPL v2");
1/*
2 * isl29020.c - Intersil ALS Driver
3 *
4 * Copyright (C) 2008 Intel Corp
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 *
22 * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/i2c.h>
29#include <linux/err.h>
30#include <linux/delay.h>
31#include <linux/sysfs.h>
32#include <linux/pm_runtime.h>
33
34static DEFINE_MUTEX(mutex);
35
36static ssize_t als_sensing_range_show(struct device *dev,
37 struct device_attribute *attr, char *buf)
38{
39 struct i2c_client *client = to_i2c_client(dev);
40 int val;
41
42 val = i2c_smbus_read_byte_data(client, 0x00);
43
44 if (val < 0)
45 return val;
46 return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
47
48}
49
50static ssize_t als_lux_input_data_show(struct device *dev,
51 struct device_attribute *attr, char *buf)
52{
53 struct i2c_client *client = to_i2c_client(dev);
54 int ret_val, val;
55 unsigned long int lux;
56 int temp;
57
58 pm_runtime_get_sync(dev);
59 msleep(100);
60
61 mutex_lock(&mutex);
62 temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
63 if (temp < 0) {
64 pm_runtime_put_sync(dev);
65 mutex_unlock(&mutex);
66 return temp;
67 }
68
69 ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
70 mutex_unlock(&mutex);
71
72 if (ret_val < 0) {
73 pm_runtime_put_sync(dev);
74 return ret_val;
75 }
76
77 ret_val |= temp << 8;
78 val = i2c_smbus_read_byte_data(client, 0x00);
79 pm_runtime_put_sync(dev);
80 if (val < 0)
81 return val;
82 lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
83 return sprintf(buf, "%ld\n", lux);
84}
85
86static ssize_t als_sensing_range_store(struct device *dev,
87 struct device_attribute *attr, const char *buf, size_t count)
88{
89 struct i2c_client *client = to_i2c_client(dev);
90 int ret_val;
91 unsigned long val;
92
93 if (strict_strtoul(buf, 10, &val))
94 return -EINVAL;
95 if (val < 1 || val > 64000)
96 return -EINVAL;
97
98 /* Pick the smallest sensor range that will meet our requirements */
99 if (val <= 1000)
100 val = 1;
101 else if (val <= 4000)
102 val = 2;
103 else if (val <= 16000)
104 val = 3;
105 else
106 val = 4;
107
108 ret_val = i2c_smbus_read_byte_data(client, 0x00);
109 if (ret_val < 0)
110 return ret_val;
111
112 ret_val &= 0xFC; /*reset the bit before setting them */
113 ret_val |= val - 1;
114 ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
115
116 if (ret_val < 0)
117 return ret_val;
118 return count;
119}
120
121static void als_set_power_state(struct i2c_client *client, int enable)
122{
123 int ret_val;
124
125 ret_val = i2c_smbus_read_byte_data(client, 0x00);
126 if (ret_val < 0)
127 return;
128
129 if (enable)
130 ret_val |= 0x80;
131 else
132 ret_val &= 0x7F;
133
134 i2c_smbus_write_byte_data(client, 0x00, ret_val);
135}
136
137static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
138 als_sensing_range_show, als_sensing_range_store);
139static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
140
141static struct attribute *mid_att_als[] = {
142 &dev_attr_lux0_sensor_range.attr,
143 &dev_attr_lux0_input.attr,
144 NULL
145};
146
147static struct attribute_group m_als_gr = {
148 .name = "isl29020",
149 .attrs = mid_att_als
150};
151
152static int als_set_default_config(struct i2c_client *client)
153{
154 int retval;
155
156 retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
157 if (retval < 0) {
158 dev_err(&client->dev, "default write failed.");
159 return retval;
160 }
161 return 0;;
162}
163
164static int isl29020_probe(struct i2c_client *client,
165 const struct i2c_device_id *id)
166{
167 int res;
168
169 res = als_set_default_config(client);
170 if (res < 0)
171 return res;
172
173 res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
174 if (res) {
175 dev_err(&client->dev, "isl29020: device create file failed\n");
176 return res;
177 }
178 dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
179 als_set_power_state(client, 0);
180 pm_runtime_enable(&client->dev);
181 return res;
182}
183
184static int isl29020_remove(struct i2c_client *client)
185{
186 sysfs_remove_group(&client->dev.kobj, &m_als_gr);
187 return 0;
188}
189
190static struct i2c_device_id isl29020_id[] = {
191 { "isl29020", 0 },
192 { }
193};
194
195MODULE_DEVICE_TABLE(i2c, isl29020_id);
196
197#ifdef CONFIG_PM
198
199static int isl29020_runtime_suspend(struct device *dev)
200{
201 struct i2c_client *client = to_i2c_client(dev);
202 als_set_power_state(client, 0);
203 return 0;
204}
205
206static int isl29020_runtime_resume(struct device *dev)
207{
208 struct i2c_client *client = to_i2c_client(dev);
209 als_set_power_state(client, 1);
210 return 0;
211}
212
213static const struct dev_pm_ops isl29020_pm_ops = {
214 .runtime_suspend = isl29020_runtime_suspend,
215 .runtime_resume = isl29020_runtime_resume,
216};
217
218#define ISL29020_PM_OPS (&isl29020_pm_ops)
219#else /* CONFIG_PM */
220#define ISL29020_PM_OPS NULL
221#endif /* CONFIG_PM */
222
223static struct i2c_driver isl29020_driver = {
224 .driver = {
225 .name = "isl29020",
226 .pm = ISL29020_PM_OPS,
227 },
228 .probe = isl29020_probe,
229 .remove = isl29020_remove,
230 .id_table = isl29020_id,
231};
232
233static int __init sensor_isl29020_init(void)
234{
235 return i2c_add_driver(&isl29020_driver);
236}
237
238static void __exit sensor_isl29020_exit(void)
239{
240 i2c_del_driver(&isl29020_driver);
241}
242
243module_init(sensor_isl29020_init);
244module_exit(sensor_isl29020_exit);
245
246MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
247MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
248MODULE_LICENSE("GPL v2");