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9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/device.h>
12#include <linux/interrupt.h>
13#include <linux/irqreturn.h>
14#include <linux/regmap.h>
15#include <linux/bitfield.h>
16
17#include <linux/iio/iio.h>
18#include <linux/iio/trigger.h>
19#include <linux/iio/events.h>
20#include <linux/iio/trigger_consumer.h>
21#include <linux/iio/triggered_buffer.h>
22#include <linux/iio/buffer.h>
23
24#include <linux/platform_data/st_sensors_pdata.h>
25
26#include "hts221.h"
27
28#define HTS221_REG_DRDY_HL_ADDR 0x22
29#define HTS221_REG_DRDY_HL_MASK BIT(7)
30#define HTS221_REG_DRDY_PP_OD_ADDR 0x22
31#define HTS221_REG_DRDY_PP_OD_MASK BIT(6)
32#define HTS221_REG_DRDY_EN_ADDR 0x22
33#define HTS221_REG_DRDY_EN_MASK BIT(2)
34#define HTS221_REG_STATUS_ADDR 0x27
35#define HTS221_RH_DRDY_MASK BIT(1)
36#define HTS221_TEMP_DRDY_MASK BIT(0)
37
38static int hts221_trig_set_state(struct iio_trigger *trig, bool state)
39{
40 struct iio_dev *iio_dev = iio_trigger_get_drvdata(trig);
41 struct hts221_hw *hw = iio_priv(iio_dev);
42
43 return regmap_update_bits(hw->regmap, HTS221_REG_DRDY_EN_ADDR,
44 HTS221_REG_DRDY_EN_MASK,
45 FIELD_PREP(HTS221_REG_DRDY_EN_MASK, state));
46}
47
48static const struct iio_trigger_ops hts221_trigger_ops = {
49 .set_trigger_state = hts221_trig_set_state,
50};
51
52static irqreturn_t hts221_trigger_handler_thread(int irq, void *private)
53{
54 struct hts221_hw *hw = private;
55 int err, status;
56
57 err = regmap_read(hw->regmap, HTS221_REG_STATUS_ADDR, &status);
58 if (err < 0)
59 return IRQ_HANDLED;
60
61
62
63
64
65
66
67 if (!(status & HTS221_RH_DRDY_MASK))
68 return IRQ_NONE;
69
70 iio_trigger_poll_chained(hw->trig);
71
72 return IRQ_HANDLED;
73}
74
75int hts221_allocate_trigger(struct hts221_hw *hw)
76{
77 struct iio_dev *iio_dev = iio_priv_to_dev(hw);
78 bool irq_active_low = false, open_drain = false;
79 struct device_node *np = hw->dev->of_node;
80 struct st_sensors_platform_data *pdata;
81 unsigned long irq_type;
82 int err;
83
84 irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));
85
86 switch (irq_type) {
87 case IRQF_TRIGGER_HIGH:
88 case IRQF_TRIGGER_RISING:
89 break;
90 case IRQF_TRIGGER_LOW:
91 case IRQF_TRIGGER_FALLING:
92 irq_active_low = true;
93 break;
94 default:
95 dev_info(hw->dev,
96 "mode %lx unsupported, using IRQF_TRIGGER_RISING\n",
97 irq_type);
98 irq_type = IRQF_TRIGGER_RISING;
99 break;
100 }
101
102 err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_HL_ADDR,
103 HTS221_REG_DRDY_HL_MASK,
104 FIELD_PREP(HTS221_REG_DRDY_HL_MASK,
105 irq_active_low));
106 if (err < 0)
107 return err;
108
109 pdata = (struct st_sensors_platform_data *)hw->dev->platform_data;
110 if ((np && of_property_read_bool(np, "drive-open-drain")) ||
111 (pdata && pdata->open_drain)) {
112 irq_type |= IRQF_SHARED;
113 open_drain = true;
114 }
115
116 err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_PP_OD_ADDR,
117 HTS221_REG_DRDY_PP_OD_MASK,
118 FIELD_PREP(HTS221_REG_DRDY_PP_OD_MASK,
119 open_drain));
120 if (err < 0)
121 return err;
122
123 err = devm_request_threaded_irq(hw->dev, hw->irq, NULL,
124 hts221_trigger_handler_thread,
125 irq_type | IRQF_ONESHOT,
126 hw->name, hw);
127 if (err) {
128 dev_err(hw->dev, "failed to request trigger irq %d\n",
129 hw->irq);
130 return err;
131 }
132
133 hw->trig = devm_iio_trigger_alloc(hw->dev, "%s-trigger",
134 iio_dev->name);
135 if (!hw->trig)
136 return -ENOMEM;
137
138 iio_trigger_set_drvdata(hw->trig, iio_dev);
139 hw->trig->ops = &hts221_trigger_ops;
140 hw->trig->dev.parent = hw->dev;
141 iio_dev->trig = iio_trigger_get(hw->trig);
142
143 return devm_iio_trigger_register(hw->dev, hw->trig);
144}
145
146static int hts221_buffer_preenable(struct iio_dev *iio_dev)
147{
148 return hts221_set_enable(iio_priv(iio_dev), true);
149}
150
151static int hts221_buffer_postdisable(struct iio_dev *iio_dev)
152{
153 return hts221_set_enable(iio_priv(iio_dev), false);
154}
155
156static const struct iio_buffer_setup_ops hts221_buffer_ops = {
157 .preenable = hts221_buffer_preenable,
158 .postenable = iio_triggered_buffer_postenable,
159 .predisable = iio_triggered_buffer_predisable,
160 .postdisable = hts221_buffer_postdisable,
161};
162
163static irqreturn_t hts221_buffer_handler_thread(int irq, void *p)
164{
165 u8 buffer[ALIGN(2 * HTS221_DATA_SIZE, sizeof(s64)) + sizeof(s64)];
166 struct iio_poll_func *pf = p;
167 struct iio_dev *iio_dev = pf->indio_dev;
168 struct hts221_hw *hw = iio_priv(iio_dev);
169 struct iio_chan_spec const *ch;
170 int err;
171
172
173 ch = &iio_dev->channels[HTS221_SENSOR_H];
174 err = regmap_bulk_read(hw->regmap, ch->address,
175 buffer, HTS221_DATA_SIZE);
176 if (err < 0)
177 goto out;
178
179
180 ch = &iio_dev->channels[HTS221_SENSOR_T];
181 err = regmap_bulk_read(hw->regmap, ch->address,
182 buffer + HTS221_DATA_SIZE, HTS221_DATA_SIZE);
183 if (err < 0)
184 goto out;
185
186 iio_push_to_buffers_with_timestamp(iio_dev, buffer,
187 iio_get_time_ns(iio_dev));
188
189out:
190 iio_trigger_notify_done(hw->trig);
191
192 return IRQ_HANDLED;
193}
194
195int hts221_allocate_buffers(struct hts221_hw *hw)
196{
197 return devm_iio_triggered_buffer_setup(hw->dev, iio_priv_to_dev(hw),
198 NULL, hts221_buffer_handler_thread,
199 &hts221_buffer_ops);
200}
201
202MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
203MODULE_DESCRIPTION("STMicroelectronics hts221 buffer driver");
204MODULE_LICENSE("GPL v2");
205
