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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020 Marek Vasut <marex@denx.de>
4 *
5 * Based on rpi_touchscreen.c by Eric Anholt <eric@anholt.net>
6 */
7
8#include <linux/backlight.h>
9#include <linux/err.h>
10#include <linux/gpio/driver.h>
11#include <linux/i2c.h>
12#include <linux/init.h>
13#include <linux/interrupt.h>
14#include <linux/module.h>
15#include <linux/regmap.h>
16#include <linux/regulator/driver.h>
17#include <linux/regulator/machine.h>
18#include <linux/regulator/of_regulator.h>
19#include <linux/slab.h>
20
21/* I2C registers of the Atmel microcontroller. */
22#define REG_ID 0x80
23#define REG_PORTA 0x81
24#define REG_PORTB 0x82
25#define REG_PORTC 0x83
26#define REG_POWERON 0x85
27#define REG_PWM 0x86
28#define REG_ADDR_L 0x8c
29#define REG_ADDR_H 0x8d
30#define REG_WRITE_DATA_H 0x90
31#define REG_WRITE_DATA_L 0x91
32
33#define PA_LCD_DITHB BIT(0)
34#define PA_LCD_MODE BIT(1)
35#define PA_LCD_LR BIT(2)
36#define PA_LCD_UD BIT(3)
37
38#define PB_BRIDGE_PWRDNX_N BIT(0)
39#define PB_LCD_VCC_N BIT(1)
40#define PB_LCD_MAIN BIT(7)
41
42#define PC_LED_EN BIT(0)
43#define PC_RST_TP_N BIT(1)
44#define PC_RST_LCD_N BIT(2)
45#define PC_RST_BRIDGE_N BIT(3)
46
47enum gpio_signals {
48 RST_BRIDGE_N, /* TC358762 bridge reset */
49 RST_TP_N, /* Touch controller reset */
50 NUM_GPIO
51};
52
53struct gpio_signal_mappings {
54 unsigned int reg;
55 unsigned int mask;
56};
57
58static const struct gpio_signal_mappings mappings[NUM_GPIO] = {
59 [RST_BRIDGE_N] = { REG_PORTC, PC_RST_BRIDGE_N | PC_RST_LCD_N },
60 [RST_TP_N] = { REG_PORTC, PC_RST_TP_N },
61};
62
63struct attiny_lcd {
64 /* lock to serialise overall accesses to the Atmel */
65 struct mutex lock;
66 struct regmap *regmap;
67 bool gpio_states[NUM_GPIO];
68 u8 port_states[3];
69
70 struct gpio_chip gc;
71};
72
73static const struct regmap_config attiny_regmap_config = {
74 .reg_bits = 8,
75 .val_bits = 8,
76 .disable_locking = 1,
77 .max_register = REG_WRITE_DATA_L,
78 .cache_type = REGCACHE_MAPLE,
79};
80
81static int attiny_set_port_state(struct attiny_lcd *state, int reg, u8 val)
82{
83 state->port_states[reg - REG_PORTA] = val;
84 return regmap_write(state->regmap, reg, val);
85};
86
87static u8 attiny_get_port_state(struct attiny_lcd *state, int reg)
88{
89 return state->port_states[reg - REG_PORTA];
90};
91
92static int attiny_lcd_power_enable(struct regulator_dev *rdev)
93{
94 struct attiny_lcd *state = rdev_get_drvdata(rdev);
95
96 mutex_lock(&state->lock);
97
98 /* Ensure bridge, and tp stay in reset */
99 attiny_set_port_state(state, REG_PORTC, 0);
100 usleep_range(5000, 10000);
101
102 /* Default to the same orientation as the closed source
103 * firmware used for the panel. Runtime rotation
104 * configuration will be supported using VC4's plane
105 * orientation bits.
106 */
107 attiny_set_port_state(state, REG_PORTA, PA_LCD_LR);
108 usleep_range(5000, 10000);
109 /* Main regulator on, and power to the panel (LCD_VCC_N) */
110 attiny_set_port_state(state, REG_PORTB, PB_LCD_MAIN);
111 usleep_range(5000, 10000);
112 /* Bring controllers out of reset */
113 attiny_set_port_state(state, REG_PORTC, PC_LED_EN);
114
115 msleep(80);
116
117 mutex_unlock(&state->lock);
118
119 return 0;
120}
121
122static int attiny_lcd_power_disable(struct regulator_dev *rdev)
123{
124 struct attiny_lcd *state = rdev_get_drvdata(rdev);
125
126 mutex_lock(&state->lock);
127
128 regmap_write(rdev->regmap, REG_PWM, 0);
129 usleep_range(5000, 10000);
130
131 attiny_set_port_state(state, REG_PORTA, 0);
132 usleep_range(5000, 10000);
133 attiny_set_port_state(state, REG_PORTB, PB_LCD_VCC_N);
134 usleep_range(5000, 10000);
135 attiny_set_port_state(state, REG_PORTC, 0);
136 msleep(30);
137
138 mutex_unlock(&state->lock);
139
140 return 0;
141}
142
143static int attiny_lcd_power_is_enabled(struct regulator_dev *rdev)
144{
145 struct attiny_lcd *state = rdev_get_drvdata(rdev);
146 unsigned int data;
147 int ret, i;
148
149 mutex_lock(&state->lock);
150
151 for (i = 0; i < 10; i++) {
152 ret = regmap_read(rdev->regmap, REG_PORTC, &data);
153 if (!ret)
154 break;
155 usleep_range(10000, 12000);
156 }
157
158 mutex_unlock(&state->lock);
159
160 if (ret < 0)
161 return ret;
162
163 return data & PC_RST_BRIDGE_N;
164}
165
166static const struct regulator_init_data attiny_regulator_default = {
167 .constraints = {
168 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
169 },
170};
171
172static const struct regulator_ops attiny_regulator_ops = {
173 .enable = attiny_lcd_power_enable,
174 .disable = attiny_lcd_power_disable,
175 .is_enabled = attiny_lcd_power_is_enabled,
176};
177
178static const struct regulator_desc attiny_regulator = {
179 .name = "tc358762-power",
180 .ops = &attiny_regulator_ops,
181 .type = REGULATOR_VOLTAGE,
182 .owner = THIS_MODULE,
183};
184
185static int attiny_update_status(struct backlight_device *bl)
186{
187 struct attiny_lcd *state = bl_get_data(bl);
188 struct regmap *regmap = state->regmap;
189 int brightness = backlight_get_brightness(bl);
190 int ret, i;
191
192 mutex_lock(&state->lock);
193
194 for (i = 0; i < 10; i++) {
195 ret = regmap_write(regmap, REG_PWM, brightness);
196 if (!ret)
197 break;
198 }
199
200 mutex_unlock(&state->lock);
201
202 return ret;
203}
204
205static const struct backlight_ops attiny_bl = {
206 .update_status = attiny_update_status,
207};
208
209static int attiny_gpio_get_direction(struct gpio_chip *gc, unsigned int off)
210{
211 return GPIO_LINE_DIRECTION_OUT;
212}
213
214static void attiny_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
215{
216 struct attiny_lcd *state = gpiochip_get_data(gc);
217 u8 last_val;
218
219 if (off >= NUM_GPIO)
220 return;
221
222 mutex_lock(&state->lock);
223
224 last_val = attiny_get_port_state(state, mappings[off].reg);
225 if (val)
226 last_val |= mappings[off].mask;
227 else
228 last_val &= ~mappings[off].mask;
229
230 attiny_set_port_state(state, mappings[off].reg, last_val);
231
232 if (off == RST_BRIDGE_N && val) {
233 usleep_range(5000, 8000);
234 regmap_write(state->regmap, REG_ADDR_H, 0x04);
235 usleep_range(5000, 8000);
236 regmap_write(state->regmap, REG_ADDR_L, 0x7c);
237 usleep_range(5000, 8000);
238 regmap_write(state->regmap, REG_WRITE_DATA_H, 0x00);
239 usleep_range(5000, 8000);
240 regmap_write(state->regmap, REG_WRITE_DATA_L, 0x00);
241
242 msleep(100);
243 }
244
245 mutex_unlock(&state->lock);
246}
247
248static int attiny_i2c_read(struct i2c_client *client, u8 reg, unsigned int *buf)
249{
250 struct i2c_msg msgs[1];
251 u8 addr_buf[1] = { reg };
252 u8 data_buf[1] = { 0, };
253 int ret;
254
255 /* Write register address */
256 msgs[0].addr = client->addr;
257 msgs[0].flags = 0;
258 msgs[0].len = ARRAY_SIZE(addr_buf);
259 msgs[0].buf = addr_buf;
260
261 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
262 if (ret != ARRAY_SIZE(msgs))
263 return -EIO;
264
265 usleep_range(5000, 10000);
266
267 /* Read data from register */
268 msgs[0].addr = client->addr;
269 msgs[0].flags = I2C_M_RD;
270 msgs[0].len = 1;
271 msgs[0].buf = data_buf;
272
273 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
274 if (ret != ARRAY_SIZE(msgs))
275 return -EIO;
276
277 *buf = data_buf[0];
278 return 0;
279}
280
281/*
282 * I2C driver interface functions
283 */
284static int attiny_i2c_probe(struct i2c_client *i2c)
285{
286 struct backlight_properties props = { };
287 struct regulator_config config = { };
288 struct backlight_device *bl;
289 struct regulator_dev *rdev;
290 struct attiny_lcd *state;
291 struct regmap *regmap;
292 unsigned int data;
293 int ret;
294
295 state = devm_kzalloc(&i2c->dev, sizeof(*state), GFP_KERNEL);
296 if (!state)
297 return -ENOMEM;
298
299 mutex_init(&state->lock);
300 i2c_set_clientdata(i2c, state);
301
302 regmap = devm_regmap_init_i2c(i2c, &attiny_regmap_config);
303 if (IS_ERR(regmap)) {
304 ret = PTR_ERR(regmap);
305 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
306 ret);
307 goto error;
308 }
309
310 ret = attiny_i2c_read(i2c, REG_ID, &data);
311 if (ret < 0) {
312 dev_err(&i2c->dev, "Failed to read REG_ID reg: %d\n", ret);
313 goto error;
314 }
315
316 switch (data) {
317 case 0xde: /* ver 1 */
318 case 0xc3: /* ver 2 */
319 break;
320 default:
321 dev_err(&i2c->dev, "Unknown Atmel firmware revision: 0x%02x\n", data);
322 ret = -ENODEV;
323 goto error;
324 }
325
326 regmap_write(regmap, REG_POWERON, 0);
327 msleep(30);
328 regmap_write(regmap, REG_PWM, 0);
329
330 config.dev = &i2c->dev;
331 config.regmap = regmap;
332 config.of_node = i2c->dev.of_node;
333 config.init_data = &attiny_regulator_default;
334 config.driver_data = state;
335
336 rdev = devm_regulator_register(&i2c->dev, &attiny_regulator, &config);
337 if (IS_ERR(rdev)) {
338 dev_err(&i2c->dev, "Failed to register ATTINY regulator\n");
339 ret = PTR_ERR(rdev);
340 goto error;
341 }
342
343 props.type = BACKLIGHT_RAW;
344 props.max_brightness = 0xff;
345
346 state->regmap = regmap;
347
348 bl = devm_backlight_device_register(&i2c->dev, dev_name(&i2c->dev),
349 &i2c->dev, state, &attiny_bl,
350 &props);
351 if (IS_ERR(bl)) {
352 ret = PTR_ERR(bl);
353 goto error;
354 }
355
356 bl->props.brightness = 0xff;
357
358 state->gc.parent = &i2c->dev;
359 state->gc.label = i2c->name;
360 state->gc.owner = THIS_MODULE;
361 state->gc.base = -1;
362 state->gc.ngpio = NUM_GPIO;
363
364 state->gc.set = attiny_gpio_set;
365 state->gc.get_direction = attiny_gpio_get_direction;
366 state->gc.can_sleep = true;
367
368 ret = devm_gpiochip_add_data(&i2c->dev, &state->gc, state);
369 if (ret) {
370 dev_err(&i2c->dev, "Failed to create gpiochip: %d\n", ret);
371 goto error;
372 }
373
374 return 0;
375
376error:
377 mutex_destroy(&state->lock);
378
379 return ret;
380}
381
382static void attiny_i2c_remove(struct i2c_client *client)
383{
384 struct attiny_lcd *state = i2c_get_clientdata(client);
385
386 mutex_destroy(&state->lock);
387}
388
389static const struct of_device_id attiny_dt_ids[] = {
390 { .compatible = "raspberrypi,7inch-touchscreen-panel-regulator" },
391 {},
392};
393MODULE_DEVICE_TABLE(of, attiny_dt_ids);
394
395static struct i2c_driver attiny_regulator_driver = {
396 .driver = {
397 .name = "rpi_touchscreen_attiny",
398 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
399 .of_match_table = attiny_dt_ids,
400 },
401 .probe = attiny_i2c_probe,
402 .remove = attiny_i2c_remove,
403};
404
405module_i2c_driver(attiny_regulator_driver);
406
407MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
408MODULE_DESCRIPTION("Regulator device driver for Raspberry Pi 7-inch touchscreen");
409MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020 Marek Vasut <marex@denx.de>
4 *
5 * Based on rpi_touchscreen.c by Eric Anholt <eric@anholt.net>
6 */
7
8#include <linux/backlight.h>
9#include <linux/err.h>
10#include <linux/gpio.h>
11#include <linux/gpio/driver.h>
12#include <linux/i2c.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/module.h>
16#include <linux/regmap.h>
17#include <linux/regulator/driver.h>
18#include <linux/regulator/machine.h>
19#include <linux/regulator/of_regulator.h>
20#include <linux/slab.h>
21
22/* I2C registers of the Atmel microcontroller. */
23#define REG_ID 0x80
24#define REG_PORTA 0x81
25#define REG_PORTB 0x82
26#define REG_PORTC 0x83
27#define REG_POWERON 0x85
28#define REG_PWM 0x86
29#define REG_ADDR_L 0x8c
30#define REG_ADDR_H 0x8d
31#define REG_WRITE_DATA_H 0x90
32#define REG_WRITE_DATA_L 0x91
33
34#define PA_LCD_DITHB BIT(0)
35#define PA_LCD_MODE BIT(1)
36#define PA_LCD_LR BIT(2)
37#define PA_LCD_UD BIT(3)
38
39#define PB_BRIDGE_PWRDNX_N BIT(0)
40#define PB_LCD_VCC_N BIT(1)
41#define PB_LCD_MAIN BIT(7)
42
43#define PC_LED_EN BIT(0)
44#define PC_RST_TP_N BIT(1)
45#define PC_RST_LCD_N BIT(2)
46#define PC_RST_BRIDGE_N BIT(3)
47
48enum gpio_signals {
49 RST_BRIDGE_N, /* TC358762 bridge reset */
50 RST_TP_N, /* Touch controller reset */
51 NUM_GPIO
52};
53
54struct gpio_signal_mappings {
55 unsigned int reg;
56 unsigned int mask;
57};
58
59static const struct gpio_signal_mappings mappings[NUM_GPIO] = {
60 [RST_BRIDGE_N] = { REG_PORTC, PC_RST_BRIDGE_N | PC_RST_LCD_N },
61 [RST_TP_N] = { REG_PORTC, PC_RST_TP_N },
62};
63
64struct attiny_lcd {
65 /* lock to serialise overall accesses to the Atmel */
66 struct mutex lock;
67 struct regmap *regmap;
68 bool gpio_states[NUM_GPIO];
69 u8 port_states[3];
70
71 struct gpio_chip gc;
72};
73
74static const struct regmap_config attiny_regmap_config = {
75 .reg_bits = 8,
76 .val_bits = 8,
77 .disable_locking = 1,
78 .max_register = REG_WRITE_DATA_L,
79 .cache_type = REGCACHE_RBTREE,
80};
81
82static int attiny_set_port_state(struct attiny_lcd *state, int reg, u8 val)
83{
84 state->port_states[reg - REG_PORTA] = val;
85 return regmap_write(state->regmap, reg, val);
86};
87
88static u8 attiny_get_port_state(struct attiny_lcd *state, int reg)
89{
90 return state->port_states[reg - REG_PORTA];
91};
92
93static int attiny_lcd_power_enable(struct regulator_dev *rdev)
94{
95 struct attiny_lcd *state = rdev_get_drvdata(rdev);
96
97 mutex_lock(&state->lock);
98
99 /* Ensure bridge, and tp stay in reset */
100 attiny_set_port_state(state, REG_PORTC, 0);
101 usleep_range(5000, 10000);
102
103 /* Default to the same orientation as the closed source
104 * firmware used for the panel. Runtime rotation
105 * configuration will be supported using VC4's plane
106 * orientation bits.
107 */
108 attiny_set_port_state(state, REG_PORTA, PA_LCD_LR);
109 usleep_range(5000, 10000);
110 /* Main regulator on, and power to the panel (LCD_VCC_N) */
111 attiny_set_port_state(state, REG_PORTB, PB_LCD_MAIN);
112 usleep_range(5000, 10000);
113 /* Bring controllers out of reset */
114 attiny_set_port_state(state, REG_PORTC, PC_LED_EN);
115
116 msleep(80);
117
118 mutex_unlock(&state->lock);
119
120 return 0;
121}
122
123static int attiny_lcd_power_disable(struct regulator_dev *rdev)
124{
125 struct attiny_lcd *state = rdev_get_drvdata(rdev);
126
127 mutex_lock(&state->lock);
128
129 regmap_write(rdev->regmap, REG_PWM, 0);
130 usleep_range(5000, 10000);
131
132 attiny_set_port_state(state, REG_PORTA, 0);
133 usleep_range(5000, 10000);
134 attiny_set_port_state(state, REG_PORTB, PB_LCD_VCC_N);
135 usleep_range(5000, 10000);
136 attiny_set_port_state(state, REG_PORTC, 0);
137 msleep(30);
138
139 mutex_unlock(&state->lock);
140
141 return 0;
142}
143
144static int attiny_lcd_power_is_enabled(struct regulator_dev *rdev)
145{
146 struct attiny_lcd *state = rdev_get_drvdata(rdev);
147 unsigned int data;
148 int ret, i;
149
150 mutex_lock(&state->lock);
151
152 for (i = 0; i < 10; i++) {
153 ret = regmap_read(rdev->regmap, REG_PORTC, &data);
154 if (!ret)
155 break;
156 usleep_range(10000, 12000);
157 }
158
159 mutex_unlock(&state->lock);
160
161 if (ret < 0)
162 return ret;
163
164 return data & PC_RST_BRIDGE_N;
165}
166
167static const struct regulator_init_data attiny_regulator_default = {
168 .constraints = {
169 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
170 },
171};
172
173static const struct regulator_ops attiny_regulator_ops = {
174 .enable = attiny_lcd_power_enable,
175 .disable = attiny_lcd_power_disable,
176 .is_enabled = attiny_lcd_power_is_enabled,
177};
178
179static const struct regulator_desc attiny_regulator = {
180 .name = "tc358762-power",
181 .ops = &attiny_regulator_ops,
182 .type = REGULATOR_VOLTAGE,
183 .owner = THIS_MODULE,
184};
185
186static int attiny_update_status(struct backlight_device *bl)
187{
188 struct attiny_lcd *state = bl_get_data(bl);
189 struct regmap *regmap = state->regmap;
190 int brightness = backlight_get_brightness(bl);
191 int ret, i;
192
193 mutex_lock(&state->lock);
194
195 for (i = 0; i < 10; i++) {
196 ret = regmap_write(regmap, REG_PWM, brightness);
197 if (!ret)
198 break;
199 }
200
201 mutex_unlock(&state->lock);
202
203 return ret;
204}
205
206static const struct backlight_ops attiny_bl = {
207 .update_status = attiny_update_status,
208};
209
210static int attiny_gpio_get_direction(struct gpio_chip *gc, unsigned int off)
211{
212 return GPIO_LINE_DIRECTION_OUT;
213}
214
215static void attiny_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
216{
217 struct attiny_lcd *state = gpiochip_get_data(gc);
218 u8 last_val;
219
220 if (off >= NUM_GPIO)
221 return;
222
223 mutex_lock(&state->lock);
224
225 last_val = attiny_get_port_state(state, mappings[off].reg);
226 if (val)
227 last_val |= mappings[off].mask;
228 else
229 last_val &= ~mappings[off].mask;
230
231 attiny_set_port_state(state, mappings[off].reg, last_val);
232
233 if (off == RST_BRIDGE_N && val) {
234 usleep_range(5000, 8000);
235 regmap_write(state->regmap, REG_ADDR_H, 0x04);
236 usleep_range(5000, 8000);
237 regmap_write(state->regmap, REG_ADDR_L, 0x7c);
238 usleep_range(5000, 8000);
239 regmap_write(state->regmap, REG_WRITE_DATA_H, 0x00);
240 usleep_range(5000, 8000);
241 regmap_write(state->regmap, REG_WRITE_DATA_L, 0x00);
242
243 msleep(100);
244 }
245
246 mutex_unlock(&state->lock);
247}
248
249static int attiny_i2c_read(struct i2c_client *client, u8 reg, unsigned int *buf)
250{
251 struct i2c_msg msgs[1];
252 u8 addr_buf[1] = { reg };
253 u8 data_buf[1] = { 0, };
254 int ret;
255
256 /* Write register address */
257 msgs[0].addr = client->addr;
258 msgs[0].flags = 0;
259 msgs[0].len = ARRAY_SIZE(addr_buf);
260 msgs[0].buf = addr_buf;
261
262 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
263 if (ret != ARRAY_SIZE(msgs))
264 return -EIO;
265
266 usleep_range(5000, 10000);
267
268 /* Read data from register */
269 msgs[0].addr = client->addr;
270 msgs[0].flags = I2C_M_RD;
271 msgs[0].len = 1;
272 msgs[0].buf = data_buf;
273
274 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
275 if (ret != ARRAY_SIZE(msgs))
276 return -EIO;
277
278 *buf = data_buf[0];
279 return 0;
280}
281
282/*
283 * I2C driver interface functions
284 */
285static int attiny_i2c_probe(struct i2c_client *i2c)
286{
287 struct backlight_properties props = { };
288 struct regulator_config config = { };
289 struct backlight_device *bl;
290 struct regulator_dev *rdev;
291 struct attiny_lcd *state;
292 struct regmap *regmap;
293 unsigned int data;
294 int ret;
295
296 state = devm_kzalloc(&i2c->dev, sizeof(*state), GFP_KERNEL);
297 if (!state)
298 return -ENOMEM;
299
300 mutex_init(&state->lock);
301 i2c_set_clientdata(i2c, state);
302
303 regmap = devm_regmap_init_i2c(i2c, &attiny_regmap_config);
304 if (IS_ERR(regmap)) {
305 ret = PTR_ERR(regmap);
306 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
307 ret);
308 goto error;
309 }
310
311 ret = attiny_i2c_read(i2c, REG_ID, &data);
312 if (ret < 0) {
313 dev_err(&i2c->dev, "Failed to read REG_ID reg: %d\n", ret);
314 goto error;
315 }
316
317 switch (data) {
318 case 0xde: /* ver 1 */
319 case 0xc3: /* ver 2 */
320 break;
321 default:
322 dev_err(&i2c->dev, "Unknown Atmel firmware revision: 0x%02x\n", data);
323 ret = -ENODEV;
324 goto error;
325 }
326
327 regmap_write(regmap, REG_POWERON, 0);
328 msleep(30);
329 regmap_write(regmap, REG_PWM, 0);
330
331 config.dev = &i2c->dev;
332 config.regmap = regmap;
333 config.of_node = i2c->dev.of_node;
334 config.init_data = &attiny_regulator_default;
335 config.driver_data = state;
336
337 rdev = devm_regulator_register(&i2c->dev, &attiny_regulator, &config);
338 if (IS_ERR(rdev)) {
339 dev_err(&i2c->dev, "Failed to register ATTINY regulator\n");
340 ret = PTR_ERR(rdev);
341 goto error;
342 }
343
344 props.type = BACKLIGHT_RAW;
345 props.max_brightness = 0xff;
346
347 state->regmap = regmap;
348
349 bl = devm_backlight_device_register(&i2c->dev, dev_name(&i2c->dev),
350 &i2c->dev, state, &attiny_bl,
351 &props);
352 if (IS_ERR(bl)) {
353 ret = PTR_ERR(bl);
354 goto error;
355 }
356
357 bl->props.brightness = 0xff;
358
359 state->gc.parent = &i2c->dev;
360 state->gc.label = i2c->name;
361 state->gc.owner = THIS_MODULE;
362 state->gc.base = -1;
363 state->gc.ngpio = NUM_GPIO;
364
365 state->gc.set = attiny_gpio_set;
366 state->gc.get_direction = attiny_gpio_get_direction;
367 state->gc.can_sleep = true;
368
369 ret = devm_gpiochip_add_data(&i2c->dev, &state->gc, state);
370 if (ret) {
371 dev_err(&i2c->dev, "Failed to create gpiochip: %d\n", ret);
372 goto error;
373 }
374
375 return 0;
376
377error:
378 mutex_destroy(&state->lock);
379
380 return ret;
381}
382
383static void attiny_i2c_remove(struct i2c_client *client)
384{
385 struct attiny_lcd *state = i2c_get_clientdata(client);
386
387 mutex_destroy(&state->lock);
388}
389
390static const struct of_device_id attiny_dt_ids[] = {
391 { .compatible = "raspberrypi,7inch-touchscreen-panel-regulator" },
392 {},
393};
394MODULE_DEVICE_TABLE(of, attiny_dt_ids);
395
396static struct i2c_driver attiny_regulator_driver = {
397 .driver = {
398 .name = "rpi_touchscreen_attiny",
399 .of_match_table = of_match_ptr(attiny_dt_ids),
400 },
401 .probe_new = attiny_i2c_probe,
402 .remove = attiny_i2c_remove,
403};
404
405module_i2c_driver(attiny_regulator_driver);
406
407MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
408MODULE_DESCRIPTION("Regulator device driver for Raspberry Pi 7-inch touchscreen");
409MODULE_LICENSE("GPL v2");