1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/err.h>
17#include <linux/hwmon.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/spi/spi.h>
20#include <linux/slab.h>
21
22enum chips { max1110, max1111, max1112, max1113 };
23
24#define MAX1111_TX_BUF_SIZE 1
25#define MAX1111_RX_BUF_SIZE 2
26
27
28#define MAX1111_CTRL_PD0 (1u << 0)
29#define MAX1111_CTRL_PD1 (1u << 1)
30#define MAX1111_CTRL_SGL (1u << 2)
31#define MAX1111_CTRL_UNI (1u << 3)
32#define MAX1110_CTRL_SEL_SH (4)
33#define MAX1111_CTRL_SEL_SH (5)
34#define MAX1111_CTRL_STR (1u << 7)
35
36struct max1111_data {
37 struct spi_device *spi;
38 struct device *hwmon_dev;
39 struct spi_message msg;
40 struct spi_transfer xfer[2];
41 uint8_t tx_buf[MAX1111_TX_BUF_SIZE];
42 uint8_t rx_buf[MAX1111_RX_BUF_SIZE];
43 struct mutex drvdata_lock;
44
45 int sel_sh;
46 int lsb;
47};
48
49static int max1111_read(struct device *dev, int channel)
50{
51 struct max1111_data *data = dev_get_drvdata(dev);
52 uint8_t v1, v2;
53 int err;
54
55
56 mutex_lock(&data->drvdata_lock);
57
58 data->tx_buf[0] = (channel << data->sel_sh) |
59 MAX1111_CTRL_PD0 | MAX1111_CTRL_PD1 |
60 MAX1111_CTRL_SGL | MAX1111_CTRL_UNI | MAX1111_CTRL_STR;
61
62 err = spi_sync(data->spi, &data->msg);
63 if (err < 0) {
64 dev_err(dev, "spi_sync failed with %d\n", err);
65 mutex_unlock(&data->drvdata_lock);
66 return err;
67 }
68
69 v1 = data->rx_buf[0];
70 v2 = data->rx_buf[1];
71
72 mutex_unlock(&data->drvdata_lock);
73
74 if ((v1 & 0xc0) || (v2 & 0x3f))
75 return -EINVAL;
76
77 return (v1 << 2) | (v2 >> 6);
78}
79
80#ifdef CONFIG_SHARPSL_PM
81static struct max1111_data *the_max1111;
82
83int max1111_read_channel(int channel)
84{
85 if (!the_max1111 || !the_max1111->spi)
86 return -ENODEV;
87
88 return max1111_read(&the_max1111->spi->dev, channel);
89}
90EXPORT_SYMBOL(max1111_read_channel);
91#endif
92
93
94
95
96
97
98static ssize_t name_show(struct device *dev,
99 struct device_attribute *attr, char *buf)
100{
101 return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);
102}
103
104static ssize_t show_adc(struct device *dev,
105 struct device_attribute *attr, char *buf)
106{
107 struct max1111_data *data = dev_get_drvdata(dev);
108 int channel = to_sensor_dev_attr(attr)->index;
109 int ret;
110
111 ret = max1111_read(dev, channel);
112 if (ret < 0)
113 return ret;
114
115
116
117
118
119 return sprintf(buf, "%d\n", ret * data->lsb);
120}
121
122#define MAX1111_ADC_ATTR(_id) \
123 SENSOR_DEVICE_ATTR(in##_id##_input, S_IRUGO, show_adc, NULL, _id)
124
125static DEVICE_ATTR_RO(name);
126static MAX1111_ADC_ATTR(0);
127static MAX1111_ADC_ATTR(1);
128static MAX1111_ADC_ATTR(2);
129static MAX1111_ADC_ATTR(3);
130static MAX1111_ADC_ATTR(4);
131static MAX1111_ADC_ATTR(5);
132static MAX1111_ADC_ATTR(6);
133static MAX1111_ADC_ATTR(7);
134
135static struct attribute *max1111_attributes[] = {
136 &dev_attr_name.attr,
137 &sensor_dev_attr_in0_input.dev_attr.attr,
138 &sensor_dev_attr_in1_input.dev_attr.attr,
139 &sensor_dev_attr_in2_input.dev_attr.attr,
140 &sensor_dev_attr_in3_input.dev_attr.attr,
141 NULL,
142};
143
144static const struct attribute_group max1111_attr_group = {
145 .attrs = max1111_attributes,
146};
147
148static struct attribute *max1110_attributes[] = {
149 &sensor_dev_attr_in4_input.dev_attr.attr,
150 &sensor_dev_attr_in5_input.dev_attr.attr,
151 &sensor_dev_attr_in6_input.dev_attr.attr,
152 &sensor_dev_attr_in7_input.dev_attr.attr,
153 NULL,
154};
155
156static const struct attribute_group max1110_attr_group = {
157 .attrs = max1110_attributes,
158};
159
160static int setup_transfer(struct max1111_data *data)
161{
162 struct spi_message *m;
163 struct spi_transfer *x;
164
165 m = &data->msg;
166 x = &data->xfer[0];
167
168 spi_message_init(m);
169
170 x->tx_buf = &data->tx_buf[0];
171 x->len = MAX1111_TX_BUF_SIZE;
172 spi_message_add_tail(x, m);
173
174 x++;
175 x->rx_buf = &data->rx_buf[0];
176 x->len = MAX1111_RX_BUF_SIZE;
177 spi_message_add_tail(x, m);
178
179 return 0;
180}
181
182static int max1111_probe(struct spi_device *spi)
183{
184 enum chips chip = spi_get_device_id(spi)->driver_data;
185 struct max1111_data *data;
186 int err;
187
188 spi->bits_per_word = 8;
189 spi->mode = SPI_MODE_0;
190 err = spi_setup(spi);
191 if (err < 0)
192 return err;
193
194 data = devm_kzalloc(&spi->dev, sizeof(struct max1111_data), GFP_KERNEL);
195 if (data == NULL)
196 return -ENOMEM;
197
198 switch (chip) {
199 case max1110:
200 data->lsb = 8;
201 data->sel_sh = MAX1110_CTRL_SEL_SH;
202 break;
203 case max1111:
204 data->lsb = 8;
205 data->sel_sh = MAX1111_CTRL_SEL_SH;
206 break;
207 case max1112:
208 data->lsb = 16;
209 data->sel_sh = MAX1110_CTRL_SEL_SH;
210 break;
211 case max1113:
212 data->lsb = 16;
213 data->sel_sh = MAX1111_CTRL_SEL_SH;
214 break;
215 }
216 err = setup_transfer(data);
217 if (err)
218 return err;
219
220 mutex_init(&data->drvdata_lock);
221
222 data->spi = spi;
223 spi_set_drvdata(spi, data);
224
225 err = sysfs_create_group(&spi->dev.kobj, &max1111_attr_group);
226 if (err) {
227 dev_err(&spi->dev, "failed to create attribute group\n");
228 return err;
229 }
230 if (chip == max1110 || chip == max1112) {
231 err = sysfs_create_group(&spi->dev.kobj, &max1110_attr_group);
232 if (err) {
233 dev_err(&spi->dev,
234 "failed to create extended attribute group\n");
235 goto err_remove;
236 }
237 }
238
239 data->hwmon_dev = hwmon_device_register(&spi->dev);
240 if (IS_ERR(data->hwmon_dev)) {
241 dev_err(&spi->dev, "failed to create hwmon device\n");
242 err = PTR_ERR(data->hwmon_dev);
243 goto err_remove;
244 }
245
246#ifdef CONFIG_SHARPSL_PM
247 the_max1111 = data;
248#endif
249 return 0;
250
251err_remove:
252 sysfs_remove_group(&spi->dev.kobj, &max1110_attr_group);
253 sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
254 return err;
255}
256
257static int max1111_remove(struct spi_device *spi)
258{
259 struct max1111_data *data = spi_get_drvdata(spi);
260
261#ifdef CONFIG_SHARPSL_PM
262 the_max1111 = NULL;
263#endif
264 hwmon_device_unregister(data->hwmon_dev);
265 sysfs_remove_group(&spi->dev.kobj, &max1110_attr_group);
266 sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
267 mutex_destroy(&data->drvdata_lock);
268 return 0;
269}
270
271static const struct spi_device_id max1111_ids[] = {
272 { "max1110", max1110 },
273 { "max1111", max1111 },
274 { "max1112", max1112 },
275 { "max1113", max1113 },
276 { },
277};
278MODULE_DEVICE_TABLE(spi, max1111_ids);
279
280static struct spi_driver max1111_driver = {
281 .driver = {
282 .name = "max1111",
283 },
284 .id_table = max1111_ids,
285 .probe = max1111_probe,
286 .remove = max1111_remove,
287};
288
289module_spi_driver(max1111_driver);
290
291MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
292MODULE_DESCRIPTION("MAX1110/MAX1111/MAX1112/MAX1113 ADC Driver");
293MODULE_LICENSE("GPL");
294
